/* * Copyright (C) 2006-2012 by Internet Systems Consortium, Inc. ("ISC") * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ #include "dhcpd.h" #ifdef DHCPv6 /* * We use print_hex_1() to output DUID values. We could actually output * the DUID with more information... MAC address if using type 1 or 3, * and so on. However, RFC 3315 contains Grave Warnings against actually * attempting to understand a DUID. */ /* * TODO: gettext() or other method of localization for the messages * for status codes (and probably for log formats eventually) * TODO: refactoring (simplify, simplify, simplify) * TODO: support multiple shared_networks on each interface (this * will allow the server to issue multiple IPv6 addresses to * a single interface) */ /* * DHCPv6 Reply workflow assist. A Reply packet is built by various * different functions; this gives us one location where we keep state * regarding a reply. */ struct reply_state { /* root level persistent state */ struct shared_network *shared; struct host_decl *host; struct subnet *subnet; /* Used to match fixed-addrs to subnet scopes. */ struct option_state *opt_state; struct packet *packet; struct data_string client_id; /* IA level persistent state */ unsigned ia_count; unsigned pd_count; unsigned client_resources; isc_boolean_t resources_included; isc_boolean_t static_lease; unsigned static_prefixes; struct ia_xx *ia; struct ia_xx *old_ia; struct option_state *reply_ia; struct data_string fixed; /* IAADDR/PREFIX level persistent state */ struct iasubopt *lease; /* * "t1", "t2", preferred, and valid lifetimes records for calculating * t1 and t2 (min/max). */ u_int32_t renew, rebind, prefer, valid; /* Client-requested valid and preferred lifetimes. */ u_int32_t client_valid, client_prefer; /* Chosen values to transmit for valid and preferred lifetimes. */ u_int32_t send_valid, send_prefer; /* Preferred prefix length (-1 is any). */ int preflen; /* Index into the data field that has been consumed. */ unsigned cursor; union reply_buffer { unsigned char data[65536]; struct dhcpv6_packet reply; } buf; }; /* * Prototypes local to this file. */ static int get_encapsulated_IA_state(struct option_state **enc_opt_state, struct data_string *enc_opt_data, struct packet *packet, struct option_cache *oc, int offset); static void build_dhcpv6_reply(struct data_string *, struct packet *); static isc_result_t shared_network_from_packet6(struct shared_network **shared, struct packet *packet); static void seek_shared_host(struct host_decl **hp, struct shared_network *shared); static isc_boolean_t fixed_matches_shared(struct host_decl *host, struct shared_network *shared); static isc_result_t reply_process_ia_na(struct reply_state *reply, struct option_cache *ia); static isc_result_t reply_process_ia_ta(struct reply_state *reply, struct option_cache *ia); static isc_result_t reply_process_addr(struct reply_state *reply, struct option_cache *addr); static isc_boolean_t address_is_owned(struct reply_state *reply, struct iaddr *addr); static isc_boolean_t temporary_is_available(struct reply_state *reply, struct iaddr *addr); static isc_result_t find_client_temporaries(struct reply_state *reply); static isc_result_t reply_process_try_addr(struct reply_state *reply, struct iaddr *addr); static isc_result_t find_client_address(struct reply_state *reply); static isc_result_t reply_process_is_addressed(struct reply_state *reply, struct binding_scope **scope, struct group *group); static isc_result_t reply_process_send_addr(struct reply_state *reply, struct iaddr *addr); static struct iasubopt *lease_compare(struct iasubopt *alpha, struct iasubopt *beta); static isc_result_t reply_process_ia_pd(struct reply_state *reply, struct option_cache *ia_pd); static isc_result_t reply_process_prefix(struct reply_state *reply, struct option_cache *pref); static isc_boolean_t prefix_is_owned(struct reply_state *reply, struct iaddrcidrnet *pref); static isc_result_t find_client_prefix(struct reply_state *reply); static isc_result_t reply_process_try_prefix(struct reply_state *reply, struct iaddrcidrnet *pref); static isc_result_t reply_process_is_prefixed(struct reply_state *reply, struct binding_scope **scope, struct group *group); static isc_result_t reply_process_send_prefix(struct reply_state *reply, struct iaddrcidrnet *pref); static struct iasubopt *prefix_compare(struct reply_state *reply, struct iasubopt *alpha, struct iasubopt *beta); static int find_hosts_by_duid_chaddr(struct host_decl **host, const struct data_string *client_id); /* * This function returns the time since DUID time start for the * given time_t value. */ static u_int32_t duid_time(time_t when) { /* * This time is modulo 2^32. */ while ((when - DUID_TIME_EPOCH) > 4294967295u) { /* use 2^31 to avoid spurious compiler warnings */ when -= 2147483648u; when -= 2147483648u; } return when - DUID_TIME_EPOCH; } /* * Server DUID. * * This must remain the same for the lifetime of this server, because * clients return the server DUID that we sent them in Request packets. * * We pick the server DUID like this: * * 1. Check dhcpd.conf - any value the administrator has configured * overrides any possible values. * 2. Check the leases.txt - we want to use the previous value if * possible. * 3. Check if dhcpd.conf specifies a type of server DUID to use, * and generate that type. * 4. Generate a type 1 (time + hardware address) DUID. */ static struct data_string server_duid; /* * Check if the server_duid has been set. */ isc_boolean_t server_duid_isset(void) { return (server_duid.data != NULL); } /* * Return the server_duid. */ void copy_server_duid(struct data_string *ds, const char *file, int line) { data_string_copy(ds, &server_duid, file, line); } /* * Set the server DUID to a specified value. This is used when * the server DUID is stored in persistent memory (basically the * leases.txt file). */ void set_server_duid(struct data_string *new_duid) { /* INSIST(new_duid != NULL); */ /* INSIST(new_duid->data != NULL); */ if (server_duid_isset()) { data_string_forget(&server_duid, MDL); } data_string_copy(&server_duid, new_duid, MDL); } /* * Set the server DUID based on the D6O_SERVERID option. This handles * the case where the administrator explicitly put it in the dhcpd.conf * file. */ isc_result_t set_server_duid_from_option(void) { struct option_state *opt_state; struct option_cache *oc; struct data_string option_duid; isc_result_t ret_val; opt_state = NULL; if (!option_state_allocate(&opt_state, MDL)) { log_fatal("No memory for server DUID."); } execute_statements_in_scope(NULL, NULL, NULL, NULL, NULL, opt_state, &global_scope, root_group, NULL); oc = lookup_option(&dhcpv6_universe, opt_state, D6O_SERVERID); if (oc == NULL) { ret_val = ISC_R_NOTFOUND; } else { memset(&option_duid, 0, sizeof(option_duid)); if (!evaluate_option_cache(&option_duid, NULL, NULL, NULL, opt_state, NULL, &global_scope, oc, MDL)) { ret_val = ISC_R_UNEXPECTED; } else { set_server_duid(&option_duid); data_string_forget(&option_duid, MDL); ret_val = ISC_R_SUCCESS; } } option_state_dereference(&opt_state, MDL); return ret_val; } /* * DUID layout, as defined in RFC 3315, section 9. * * We support type 1 (hardware address plus time) and type 3 (hardware * address). * * We can support type 2 for specific vendors in the future, if they * publish the specification. And of course there may be additional * types later. */ static int server_duid_type = DUID_LLT; /* * Set the DUID type. */ void set_server_duid_type(int type) { server_duid_type = type; } /* * Generate a new server DUID. This is done if there was no DUID in * the leases.txt or in the dhcpd.conf file. */ isc_result_t generate_new_server_duid(void) { struct interface_info *p; u_int32_t time_val; struct data_string generated_duid; /* * Verify we have a type that we support. */ if ((server_duid_type != DUID_LL) && (server_duid_type != DUID_LLT)) { log_error("Invalid DUID type %d specified, " "only LL and LLT types supported", server_duid_type); return DHCP_R_INVALIDARG; } /* * Find an interface with a hardware address. * Any will do. :) */ for (p = interfaces; p != NULL; p = p->next) { if (p->hw_address.hlen > 0) { break; } } if (p == NULL) { return ISC_R_UNEXPECTED; } /* * Build our DUID. */ memset(&generated_duid, 0, sizeof(generated_duid)); if (server_duid_type == DUID_LLT) { time_val = duid_time(time(NULL)); generated_duid.len = 8 + p->hw_address.hlen - 1; if (!buffer_allocate(&generated_duid.buffer, generated_duid.len, MDL)) { log_fatal("No memory for server DUID."); } generated_duid.data = generated_duid.buffer->data; putUShort(generated_duid.buffer->data, DUID_LLT); putUShort(generated_duid.buffer->data + 2, p->hw_address.hbuf[0]); putULong(generated_duid.buffer->data + 4, time_val); memcpy(generated_duid.buffer->data + 8, p->hw_address.hbuf+1, p->hw_address.hlen-1); } else if (server_duid_type == DUID_LL) { generated_duid.len = 4 + p->hw_address.hlen - 1; if (!buffer_allocate(&generated_duid.buffer, generated_duid.len, MDL)) { log_fatal("No memory for server DUID."); } generated_duid.data = generated_duid.buffer->data; putUShort(generated_duid.buffer->data, DUID_LL); putUShort(generated_duid.buffer->data + 2, p->hw_address.hbuf[0]); memcpy(generated_duid.buffer->data + 4, p->hw_address.hbuf+1, p->hw_address.hlen-1); } else { log_fatal("Unsupported server DUID type %d.", server_duid_type); } set_server_duid(&generated_duid); data_string_forget(&generated_duid, MDL); return ISC_R_SUCCESS; } /* * Get the client identifier from the packet. */ isc_result_t get_client_id(struct packet *packet, struct data_string *client_id) { struct option_cache *oc; /* * Verify our client_id structure is empty. */ if ((client_id->data != NULL) || (client_id->len != 0)) { return DHCP_R_INVALIDARG; } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_CLIENTID); if (oc == NULL) { return ISC_R_NOTFOUND; } if (!evaluate_option_cache(client_id, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { return ISC_R_FAILURE; } return ISC_R_SUCCESS; } /* * Message validation, defined in RFC 3315, sections 15.2, 15.5, 15.7: * * Servers MUST discard any Solicit messages that do not include a * Client Identifier option or that do include a Server Identifier * option. */ int valid_client_msg(struct packet *packet, struct data_string *client_id) { int ret_val; struct option_cache *oc; struct data_string data; ret_val = 0; memset(client_id, 0, sizeof(*client_id)); memset(&data, 0, sizeof(data)); switch (get_client_id(packet, client_id)) { case ISC_R_SUCCESS: break; case ISC_R_NOTFOUND: log_debug("Discarding %s from %s; " "client identifier missing", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr)); goto exit; default: log_error("Error processing %s from %s; " "unable to evaluate Client Identifier", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr)); goto exit; } /* * Required by RFC 3315, section 15. */ if (packet->unicast) { log_debug("Discarding %s from %s; packet sent unicast " "(CLIENTID %s)", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), print_hex_1(client_id->len, client_id->data, 60)); goto exit; } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); if (oc != NULL) { if (evaluate_option_cache(&data, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_debug("Discarding %s from %s; " "server identifier found " "(CLIENTID %s, SERVERID %s)", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), print_hex_1(client_id->len, client_id->data, 60), print_hex_2(data.len, data.data, 60)); } else { log_debug("Discarding %s from %s; " "server identifier found " "(CLIENTID %s)", dhcpv6_type_names[packet->dhcpv6_msg_type], print_hex_1(client_id->len, client_id->data, 60), piaddr(packet->client_addr)); } goto exit; } /* looks good */ ret_val = 1; exit: if (data.len > 0) { data_string_forget(&data, MDL); } if (!ret_val) { if (client_id->len > 0) { data_string_forget(client_id, MDL); } } return ret_val; } /* * Response validation, defined in RFC 3315, sections 15.4, 15.6, 15.8, * 15.9 (slightly different wording, but same meaning): * * Servers MUST discard any received Request message that meet any of * the following conditions: * * - the message does not include a Server Identifier option. * - the contents of the Server Identifier option do not match the * server's DUID. * - the message does not include a Client Identifier option. */ int valid_client_resp(struct packet *packet, struct data_string *client_id, struct data_string *server_id) { int ret_val; struct option_cache *oc; /* INSIST((duid.data != NULL) && (duid.len > 0)); */ ret_val = 0; memset(client_id, 0, sizeof(*client_id)); memset(server_id, 0, sizeof(*server_id)); switch (get_client_id(packet, client_id)) { case ISC_R_SUCCESS: break; case ISC_R_NOTFOUND: log_debug("Discarding %s from %s; " "client identifier missing", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr)); goto exit; default: log_error("Error processing %s from %s; " "unable to evaluate Client Identifier", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr)); goto exit; } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); if (oc == NULL) { log_debug("Discarding %s from %s: " "server identifier missing (CLIENTID %s)", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), print_hex_1(client_id->len, client_id->data, 60)); goto exit; } if (!evaluate_option_cache(server_id, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("Error processing %s from %s; " "unable to evaluate Server Identifier (CLIENTID %s)", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), print_hex_1(client_id->len, client_id->data, 60)); goto exit; } if ((server_duid.len != server_id->len) || (memcmp(server_duid.data, server_id->data, server_duid.len) != 0)) { log_debug("Discarding %s from %s; " "not our server identifier " "(CLIENTID %s, SERVERID %s, server DUID %s)", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), print_hex_1(client_id->len, client_id->data, 60), print_hex_2(server_id->len, server_id->data, 60), print_hex_3(server_duid.len, server_duid.data, 60)); goto exit; } /* looks good */ ret_val = 1; exit: if (!ret_val) { if (server_id->len > 0) { data_string_forget(server_id, MDL); } if (client_id->len > 0) { data_string_forget(client_id, MDL); } } return ret_val; } /* * Information request validation, defined in RFC 3315, section 15.12: * * Servers MUST discard any received Information-request message that * meets any of the following conditions: * * - The message includes a Server Identifier option and the DUID in * the option does not match the server's DUID. * * - The message includes an IA option. */ int valid_client_info_req(struct packet *packet, struct data_string *server_id) { int ret_val; struct option_cache *oc; struct data_string client_id; char client_id_str[80]; /* print_hex_1() uses maximum 60 characters, plus a few more for extra information */ ret_val = 0; memset(server_id, 0, sizeof(*server_id)); /* * Make a string that we can print out to give more * information about the client if we need to. * * By RFC 3315, Section 18.1.5 clients SHOULD have a * client-id on an Information-request packet, but it * is not strictly necessary. */ if (get_client_id(packet, &client_id) == ISC_R_SUCCESS) { snprintf(client_id_str, sizeof(client_id_str), " (CLIENTID %s)", print_hex_1(client_id.len, client_id.data, 60)); data_string_forget(&client_id, MDL); } else { client_id_str[0] = '\0'; } /* * Required by RFC 3315, section 15. */ if (packet->unicast) { log_debug("Discarding %s from %s; packet sent unicast%s", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), client_id_str); goto exit; } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); if (oc != NULL) { log_debug("Discarding %s from %s; " "IA_NA option present%s", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), client_id_str); goto exit; } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); if (oc != NULL) { log_debug("Discarding %s from %s; " "IA_TA option present%s", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), client_id_str); goto exit; } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); if (oc != NULL) { log_debug("Discarding %s from %s; " "IA_PD option present%s", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), client_id_str); goto exit; } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_SERVERID); if (oc != NULL) { if (!evaluate_option_cache(server_id, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("Error processing %s from %s; " "unable to evaluate Server Identifier%s", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), client_id_str); goto exit; } if ((server_duid.len != server_id->len) || (memcmp(server_duid.data, server_id->data, server_duid.len) != 0)) { log_debug("Discarding %s from %s; " "not our server identifier " "(SERVERID %s, server DUID %s)%s", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), print_hex_1(server_id->len, server_id->data, 60), print_hex_2(server_duid.len, server_duid.data, 60), client_id_str); goto exit; } } /* looks good */ ret_val = 1; exit: if (!ret_val) { if (server_id->len > 0) { data_string_forget(server_id, MDL); } } return ret_val; } /* * Options that we want to send, in addition to what was requested * via the ORO. */ static const int required_opts[] = { D6O_CLIENTID, D6O_SERVERID, D6O_STATUS_CODE, D6O_PREFERENCE, 0 }; static const int required_opts_NAA[] = { D6O_CLIENTID, D6O_SERVERID, D6O_STATUS_CODE, 0 }; static const int required_opts_solicit[] = { D6O_CLIENTID, D6O_SERVERID, D6O_IA_NA, D6O_IA_TA, D6O_IA_PD, D6O_RAPID_COMMIT, D6O_STATUS_CODE, D6O_RECONF_ACCEPT, D6O_PREFERENCE, 0 }; static const int required_opts_agent[] = { D6O_INTERFACE_ID, D6O_RELAY_MSG, 0 }; static const int required_opts_IA[] = { D6O_IAADDR, D6O_STATUS_CODE, 0 }; static const int required_opts_IA_PD[] = { D6O_IAPREFIX, D6O_STATUS_CODE, 0 }; static const int required_opts_STATUS_CODE[] = { D6O_STATUS_CODE, 0 }; /* * Extracts from packet contents an IA_* option, storing the IA structure * in its entirety in enc_opt_data, and storing any decoded DHCPv6 options * in enc_opt_state for later lookup and evaluation. The 'offset' indicates * where in the IA_* the DHCPv6 options commence. */ static int get_encapsulated_IA_state(struct option_state **enc_opt_state, struct data_string *enc_opt_data, struct packet *packet, struct option_cache *oc, int offset) { /* * Get the raw data for the encapsulated options. */ memset(enc_opt_data, 0, sizeof(*enc_opt_data)); if (!evaluate_option_cache(enc_opt_data, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("get_encapsulated_IA_state: " "error evaluating raw option."); return 0; } if (enc_opt_data->len < offset) { log_error("get_encapsulated_IA_state: raw option too small."); data_string_forget(enc_opt_data, MDL); return 0; } /* * Now create the option state structure, and pass it to the * function that parses options. */ *enc_opt_state = NULL; if (!option_state_allocate(enc_opt_state, MDL)) { log_error("get_encapsulated_IA_state: no memory for options."); data_string_forget(enc_opt_data, MDL); return 0; } if (!parse_option_buffer(*enc_opt_state, enc_opt_data->data + offset, enc_opt_data->len - offset, &dhcpv6_universe)) { log_error("get_encapsulated_IA_state: error parsing options."); option_state_dereference(enc_opt_state, MDL); data_string_forget(enc_opt_data, MDL); return 0; } return 1; } static int set_status_code(u_int16_t status_code, const char *status_message, struct option_state *opt_state) { struct data_string d; int ret_val; memset(&d, 0, sizeof(d)); d.len = sizeof(status_code) + strlen(status_message); if (!buffer_allocate(&d.buffer, d.len, MDL)) { log_fatal("set_status_code: no memory for status code."); } d.data = d.buffer->data; putUShort(d.buffer->data, status_code); memcpy(d.buffer->data + sizeof(status_code), status_message, d.len - sizeof(status_code)); if (!save_option_buffer(&dhcpv6_universe, opt_state, d.buffer, (unsigned char *)d.data, d.len, D6O_STATUS_CODE, 0)) { log_error("set_status_code: error saving status code."); ret_val = 0; } else { ret_val = 1; } data_string_forget(&d, MDL); return ret_val; } /* * We have a set of operations we do to set up the reply packet, which * is the same for many message types. */ static int start_reply(struct packet *packet, const struct data_string *client_id, const struct data_string *server_id, struct option_state **opt_state, struct dhcpv6_packet *reply) { struct option_cache *oc; const unsigned char *server_id_data; int server_id_len; /* * Build our option state for reply. */ *opt_state = NULL; if (!option_state_allocate(opt_state, MDL)) { log_error("start_reply: no memory for option_state."); return 0; } execute_statements_in_scope(NULL, packet, NULL, NULL, packet->options, *opt_state, &global_scope, root_group, NULL); /* * A small bit of special handling for Solicit messages. * * We could move the logic into a flag, but for now just check * explicitly. */ if (packet->dhcpv6_msg_type == DHCPV6_SOLICIT) { reply->msg_type = DHCPV6_ADVERTISE; /* * If: * - this message type supports rapid commit (Solicit), and * - the server is configured to supply a rapid commit, and * - the client requests a rapid commit, * Then we add a rapid commit option, and send Reply (instead * of an Advertise). */ oc = lookup_option(&dhcpv6_universe, *opt_state, D6O_RAPID_COMMIT); if (oc != NULL) { oc = lookup_option(&dhcpv6_universe, packet->options, D6O_RAPID_COMMIT); if (oc != NULL) { /* Rapid-commit in action. */ reply->msg_type = DHCPV6_REPLY; } else { /* Don't want a rapid-commit in advertise. */ delete_option(&dhcpv6_universe, *opt_state, D6O_RAPID_COMMIT); } } } else { reply->msg_type = DHCPV6_REPLY; /* Delete the rapid-commit from the sent options. */ oc = lookup_option(&dhcpv6_universe, *opt_state, D6O_RAPID_COMMIT); if (oc != NULL) { delete_option(&dhcpv6_universe, *opt_state, D6O_RAPID_COMMIT); } } /* * Use the client's transaction identifier for the reply. */ memcpy(reply->transaction_id, packet->dhcpv6_transaction_id, sizeof(reply->transaction_id)); /* * RFC 3315, section 18.2 says we need server identifier and * client identifier. * * If the server ID is defined via the configuration file, then * it will already be present in the option state at this point, * so we don't need to set it. * * If we have a server ID passed in from the caller, * use that, otherwise use the global DUID. */ oc = lookup_option(&dhcpv6_universe, *opt_state, D6O_SERVERID); if (oc == NULL) { if (server_id == NULL) { server_id_data = server_duid.data; server_id_len = server_duid.len; } else { server_id_data = server_id->data; server_id_len = server_id->len; } if (!save_option_buffer(&dhcpv6_universe, *opt_state, NULL, (unsigned char *)server_id_data, server_id_len, D6O_SERVERID, 0)) { log_error("start_reply: " "error saving server identifier."); return 0; } } if (client_id->buffer != NULL) { if (!save_option_buffer(&dhcpv6_universe, *opt_state, client_id->buffer, (unsigned char *)client_id->data, client_id->len, D6O_CLIENTID, 0)) { log_error("start_reply: error saving " "client identifier."); return 0; } } /* * If the client accepts reconfiguration, let it know that we * will send them. * * Note: we don't actually do this yet, but DOCSIS requires we * claim to. */ oc = lookup_option(&dhcpv6_universe, packet->options, D6O_RECONF_ACCEPT); if (oc != NULL) { if (!save_option_buffer(&dhcpv6_universe, *opt_state, NULL, (unsigned char *)"", 0, D6O_RECONF_ACCEPT, 0)) { log_error("start_reply: " "error saving RECONF_ACCEPT option."); option_state_dereference(opt_state, MDL); return 0; } } return 1; } /* * Try to get the IPv6 address the client asked for from the * pool. * * addr is the result (should be a pointer to NULL on entry) * pool is the pool to search in * requested_addr is the address the client wants */ static isc_result_t try_client_v6_address(struct iasubopt **addr, struct ipv6_pool *pool, const struct data_string *requested_addr) { struct in6_addr tmp_addr; isc_result_t result; if (requested_addr->len < sizeof(tmp_addr)) { return DHCP_R_INVALIDARG; } memcpy(&tmp_addr, requested_addr->data, sizeof(tmp_addr)); if (IN6_IS_ADDR_UNSPECIFIED(&tmp_addr)) { return ISC_R_FAILURE; } /* * The address is not covered by this (or possibly any) dynamic * range. */ if (!ipv6_in_pool(&tmp_addr, pool)) { return ISC_R_ADDRNOTAVAIL; } if (lease6_exists(pool, &tmp_addr)) { return ISC_R_ADDRINUSE; } result = iasubopt_allocate(addr, MDL); if (result != ISC_R_SUCCESS) { return result; } (*addr)->addr = tmp_addr; (*addr)->plen = 0; /* Default is soft binding for 2 minutes. */ result = add_lease6(pool, *addr, cur_time + 120); if (result != ISC_R_SUCCESS) { iasubopt_dereference(addr, MDL); } return result; } /* * Get an IPv6 address for the client. * * addr is the result (should be a pointer to NULL on entry) * packet is the information about the packet from the client * requested_iaaddr is a hint from the client * client_id is the DUID for the client */ static isc_result_t pick_v6_address(struct iasubopt **addr, struct shared_network *shared_network, const struct data_string *client_id) { struct ipv6_pool *p; int i; int start_pool; unsigned int attempts; char tmp_buf[INET6_ADDRSTRLEN]; /* * No address pools, we're done. */ if (shared_network->ipv6_pools == NULL) { log_debug("Unable to pick client address: " "no IPv6 pools on this shared network"); return ISC_R_NORESOURCES; } for (i = 0;; i++) { p = shared_network->ipv6_pools[i]; if (p == NULL) { log_debug("Unable to pick client address: " "no IPv6 address pools " "on this shared network"); return ISC_R_NORESOURCES; } if (p->pool_type == D6O_IA_NA) { break; } } /* * Otherwise try to get a lease from the first subnet possible. * * We start looking at the last pool we allocated from, unless * it had a collision trying to allocate an address. This will * tend to move us into less-filled pools. */ start_pool = shared_network->last_ipv6_pool; i = start_pool; do { p = shared_network->ipv6_pools[i]; if ((p->pool_type == D6O_IA_NA) && (create_lease6(p, addr, &attempts, client_id, cur_time + 120) == ISC_R_SUCCESS)) { /* * Record the pool used (or next one if there * was a collision). */ if (attempts > 1) { i++; if (shared_network->ipv6_pools[i] == NULL) { i = 0; } } shared_network->last_ipv6_pool = i; log_debug("Picking pool address %s", inet_ntop(AF_INET6, &((*addr)->addr), tmp_buf, sizeof(tmp_buf))); return ISC_R_SUCCESS; } i++; if (shared_network->ipv6_pools[i] == NULL) { i = 0; } } while (i != start_pool); /* * If we failed to pick an IPv6 address from any of the subnets. * Presumably that means we have no addresses for the client. */ log_debug("Unable to pick client address: no addresses available"); return ISC_R_NORESOURCES; } /* * Try to get the IPv6 prefix the client asked for from the * prefix pool. * * pref is the result (should be a pointer to NULL on entry) * pool is the prefix pool to search in * requested_pref is the address the client wants */ static isc_result_t try_client_v6_prefix(struct iasubopt **pref, struct ipv6_pool *pool, const struct data_string *requested_pref) { u_int8_t tmp_plen; struct in6_addr tmp_pref; struct iaddr ia; isc_result_t result; if (requested_pref->len < sizeof(tmp_plen) + sizeof(tmp_pref)) { return DHCP_R_INVALIDARG; } tmp_plen = (int) requested_pref->data[0]; if ((tmp_plen < 3) || (tmp_plen > 128) || ((int)tmp_plen != pool->units)) { return ISC_R_FAILURE; } memcpy(&tmp_pref, requested_pref->data + 1, sizeof(tmp_pref)); if (IN6_IS_ADDR_UNSPECIFIED(&tmp_pref)) { return ISC_R_FAILURE; } ia.len = 16; memcpy(&ia.iabuf, &tmp_pref, 16); if (!is_cidr_mask_valid(&ia, (int) tmp_plen)) { return ISC_R_FAILURE; } if (!ipv6_in_pool(&tmp_pref, pool)) { return ISC_R_ADDRNOTAVAIL; } if (prefix6_exists(pool, &tmp_pref, tmp_plen)) { return ISC_R_ADDRINUSE; } result = iasubopt_allocate(pref, MDL); if (result != ISC_R_SUCCESS) { return result; } (*pref)->addr = tmp_pref; (*pref)->plen = tmp_plen; /* Default is soft binding for 2 minutes. */ result = add_lease6(pool, *pref, cur_time + 120); if (result != ISC_R_SUCCESS) { iasubopt_dereference(pref, MDL); } return result; } /* * Get an IPv6 prefix for the client. * * pref is the result (should be a pointer to NULL on entry) * packet is the information about the packet from the client * requested_iaprefix is a hint from the client * plen is -1 or the requested prefix length * client_id is the DUID for the client */ static isc_result_t pick_v6_prefix(struct iasubopt **pref, int plen, struct shared_network *shared_network, const struct data_string *client_id) { struct ipv6_pool *p; int i; unsigned int attempts; char tmp_buf[INET6_ADDRSTRLEN]; /* * No prefix pools, we're done. */ if (shared_network->ipv6_pools == NULL) { log_debug("Unable to pick client prefix: " "no IPv6 pools on this shared network"); return ISC_R_NORESOURCES; } for (i = 0;; i++) { p = shared_network->ipv6_pools[i]; if (p == NULL) { log_debug("Unable to pick client prefix: " "no IPv6 prefix pools " "on this shared network"); return ISC_R_NORESOURCES; } if (p->pool_type == D6O_IA_PD) { break; } } /* * Otherwise try to get a prefix. */ for (i = 0;; i++) { p = shared_network->ipv6_pools[i]; if (p == NULL) { break; } if (p->pool_type != D6O_IA_PD) { continue; } /* * Try only pools with the requested prefix length if any. */ if ((plen >= 0) && (p->units != plen)) { continue; } if (create_prefix6(p, pref, &attempts, client_id, cur_time + 120) == ISC_R_SUCCESS) { log_debug("Picking pool prefix %s/%u", inet_ntop(AF_INET6, &((*pref)->addr), tmp_buf, sizeof(tmp_buf)), (unsigned) (*pref)->plen); return ISC_R_SUCCESS; } } /* * If we failed to pick an IPv6 prefix * Presumably that means we have no prefixes for the client. */ log_debug("Unable to pick client prefix: no prefixes available"); return ISC_R_NORESOURCES; } /* * lease_to_client() is called from several messages to construct a * reply that contains all that we know about the client's correct lease * (or projected lease). * * Solicit - "Soft" binding, ignore unknown addresses or bindings, just * send what we "may" give them on a request. * * Request - "Hard" binding, but ignore supplied addresses (just provide what * the client should really use). * * Renew - "Hard" binding, but client-supplied addresses are 'real'. Error * Rebind out any "wrong" addresses the client sends. This means we send * an empty IA_NA with a status code of NoBinding or NotOnLink or * possibly send the address with zeroed lifetimes. * * Information-Request - No binding. * * The basic structure is to traverse the client-supplied data first, and * validate and echo back any contents that can be. If the client-supplied * data does not error out (on renew/rebind as above), but we did not send * any addresses, attempt to allocate one. */ /* TODO: look at client hints for lease times */ static void lease_to_client(struct data_string *reply_ret, struct packet *packet, const struct data_string *client_id, const struct data_string *server_id) { static struct reply_state reply; struct option_cache *oc; struct data_string packet_oro; #if defined (RFC3315_PRE_ERRATA_2010_08) isc_boolean_t no_resources_avail = ISC_FALSE; #endif /* Locate the client. */ if (shared_network_from_packet6(&reply.shared, packet) != ISC_R_SUCCESS) goto exit; /* * Initialize the reply. */ packet_reference(&reply.packet, packet, MDL); data_string_copy(&reply.client_id, client_id, MDL); if (!start_reply(packet, client_id, server_id, &reply.opt_state, &reply.buf.reply)) goto exit; /* Set the write cursor to just past the reply header. */ reply.cursor = REPLY_OPTIONS_INDEX; /* * Get the ORO from the packet, if any. */ oc = lookup_option(&dhcpv6_universe, packet->options, D6O_ORO); memset(&packet_oro, 0, sizeof(packet_oro)); if (oc != NULL) { if (!evaluate_option_cache(&packet_oro, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("lease_to_client: error evaluating ORO."); goto exit; } } /* * Find a host record that matches from the packet, if any, and is * valid for the shared network the client is on. */ if (find_hosts_by_uid(&reply.host, client_id->data, client_id->len, MDL)) seek_shared_host(&reply.host, reply.shared); if ((reply.host == NULL) && find_hosts_by_option(&reply.host, packet, packet->options, MDL)) seek_shared_host(&reply.host, reply.shared); /* * Check for 'hardware' matches last, as some of the synthesis methods * are not considered to be as reliable. */ if ((reply.host == NULL) && find_hosts_by_duid_chaddr(&reply.host, client_id)) seek_shared_host(&reply.host, reply.shared); /* Process the client supplied IA's onto the reply buffer. */ reply.ia_count = 0; oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); for (; oc != NULL ; oc = oc->next) { isc_result_t status; /* Start counting resources (addresses) offered. */ reply.client_resources = 0; reply.resources_included = ISC_FALSE; status = reply_process_ia_na(&reply, oc); /* * We continue to try other IA's whether we can address * this one or not. Any other result is an immediate fail. */ if ((status != ISC_R_SUCCESS) && (status != ISC_R_NORESOURCES)) goto exit; #if defined (RFC3315_PRE_ERRATA_2010_08) /* * If any address cannot be given to any IA, then set the * NoAddrsAvail status code. */ if (reply.client_resources == 0) no_resources_avail = ISC_TRUE; #endif } oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); for (; oc != NULL ; oc = oc->next) { isc_result_t status; /* Start counting resources (addresses) offered. */ reply.client_resources = 0; reply.resources_included = ISC_FALSE; status = reply_process_ia_ta(&reply, oc); /* * We continue to try other IA's whether we can address * this one or not. Any other result is an immediate fail. */ if ((status != ISC_R_SUCCESS) && (status != ISC_R_NORESOURCES)) goto exit; #if defined (RFC3315_PRE_ERRATA_2010_08) /* * If any address cannot be given to any IA, then set the * NoAddrsAvail status code. */ if (reply.client_resources == 0) no_resources_avail = ISC_TRUE; #endif } /* Same for IA_PD's. */ reply.pd_count = 0; oc = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); for (; oc != NULL ; oc = oc->next) { isc_result_t status; /* Start counting resources (prefixes) offered. */ reply.client_resources = 0; reply.resources_included = ISC_FALSE; status = reply_process_ia_pd(&reply, oc); /* * We continue to try other IA_PD's whether we can address * this one or not. Any other result is an immediate fail. */ if ((status != ISC_R_SUCCESS) && (status != ISC_R_NORESOURCES)) goto exit; } /* * Make no reply if we gave no resources and is not * for Information-Request. */ if ((reply.ia_count == 0) && (reply.pd_count == 0)) { if (reply.packet->dhcpv6_msg_type != DHCPV6_INFORMATION_REQUEST) goto exit; /* * Because we only execute statements on a per-IA basis, * we need to execute statements in any non-IA reply to * source configuration. */ execute_statements_in_scope(NULL, reply.packet, NULL, NULL, reply.packet->options, reply.opt_state, &global_scope, reply.shared->group, root_group); /* Bring in any configuration from a host record. */ if (reply.host != NULL) execute_statements_in_scope(NULL, reply.packet, NULL, NULL, reply.packet->options, reply.opt_state, &global_scope, reply.host->group, reply.shared->group); } /* * RFC3315 section 17.2.2 (Solicit): * * If the server will not assign any addresses to any IAs in a * subsequent Request from the client, the server MUST send an * Advertise message to the client that includes only a Status * Code option with code NoAddrsAvail and a status message for * the user, a Server Identifier option with the server's DUID, * and a Client Identifier option with the client's DUID. * * Section 18.2.1 (Request): * * If the server cannot assign any addresses to an IA in the * message from the client, the server MUST include the IA in * the Reply message with no addresses in the IA and a Status * Code option in the IA containing status code NoAddrsAvail. * * Section 18.1.8 (Client Behavior): * * Leave unchanged any information about addresses the client has * recorded in the IA but that were not included in the IA from * the server. * Sends a Renew/Rebind if the IA is not in the Reply message. */ #if defined (RFC3315_PRE_ERRATA_2010_08) if (no_resources_avail && (reply.ia_count != 0) && (reply.packet->dhcpv6_msg_type == DHCPV6_SOLICIT)) { /* Set the NoAddrsAvail status code. */ if (!set_status_code(STATUS_NoAddrsAvail, "No addresses available for this " "interface.", reply.opt_state)) { log_error("lease_to_client: Unable to set " "NoAddrsAvail status code."); goto exit; } /* Rewind the cursor to the start. */ reply.cursor = REPLY_OPTIONS_INDEX; /* * Produce an advertise that includes only: * * Status code. * Server DUID. * Client DUID. */ reply.buf.reply.msg_type = DHCPV6_ADVERTISE; reply.cursor += store_options6((char *)reply.buf.data + reply.cursor, sizeof(reply.buf) - reply.cursor, reply.opt_state, reply.packet, required_opts_NAA, NULL); } else { /* * Having stored the client's IA's, store any options that * will fit in the remaining space. */ reply.cursor += store_options6((char *)reply.buf.data + reply.cursor, sizeof(reply.buf) - reply.cursor, reply.opt_state, reply.packet, required_opts_solicit, &packet_oro); } #else /* defined (RFC3315_PRE_ERRATA_2010_08) */ /* * Having stored the client's IA's, store any options that * will fit in the remaining space. */ reply.cursor += store_options6((char *)reply.buf.data + reply.cursor, sizeof(reply.buf) - reply.cursor, reply.opt_state, reply.packet, required_opts_solicit, &packet_oro); #endif /* defined (RFC3315_PRE_ERRATA_2010_08) */ /* Return our reply to the caller. */ reply_ret->len = reply.cursor; reply_ret->buffer = NULL; if (!buffer_allocate(&reply_ret->buffer, reply.cursor, MDL)) { log_fatal("No memory to store Reply."); } memcpy(reply_ret->buffer->data, reply.buf.data, reply.cursor); reply_ret->data = reply_ret->buffer->data; exit: /* Cleanup. */ if (reply.shared != NULL) shared_network_dereference(&reply.shared, MDL); if (reply.host != NULL) host_dereference(&reply.host, MDL); if (reply.opt_state != NULL) option_state_dereference(&reply.opt_state, MDL); if (reply.packet != NULL) packet_dereference(&reply.packet, MDL); if (reply.client_id.data != NULL) data_string_forget(&reply.client_id, MDL); reply.renew = reply.rebind = reply.prefer = reply.valid = 0; reply.cursor = 0; } /* Process a client-supplied IA_NA. This may append options to the tail of * the reply packet being built in the reply_state structure. */ static isc_result_t reply_process_ia_na(struct reply_state *reply, struct option_cache *ia) { isc_result_t status = ISC_R_SUCCESS; u_int32_t iaid; unsigned ia_cursor; struct option_state *packet_ia; struct option_cache *oc; struct data_string ia_data, data; /* Initialize values that will get cleaned up on return. */ packet_ia = NULL; memset(&ia_data, 0, sizeof(ia_data)); memset(&data, 0, sizeof(data)); /* * Note that find_client_address() may set reply->lease. */ /* Make sure there is at least room for the header. */ if ((reply->cursor + IA_NA_OFFSET + 4) > sizeof(reply->buf)) { log_error("reply_process_ia_na: Reply too long for IA."); return ISC_R_NOSPACE; } /* Fetch the IA_NA contents. */ if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, ia, IA_NA_OFFSET)) { log_error("reply_process_ia_na: error evaluating ia"); status = ISC_R_FAILURE; goto cleanup; } /* Extract IA_NA header contents. */ iaid = getULong(ia_data.data); reply->renew = getULong(ia_data.data + 4); reply->rebind = getULong(ia_data.data + 8); /* Create an IA_NA structure. */ if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, reply->client_id.len, MDL) != ISC_R_SUCCESS) { log_error("reply_process_ia_na: no memory for ia."); status = ISC_R_NOMEMORY; goto cleanup; } reply->ia->ia_type = D6O_IA_NA; /* Cache pre-existing IA, if any. */ ia_hash_lookup(&reply->old_ia, ia_na_active, (unsigned char *)reply->ia->iaid_duid.data, reply->ia->iaid_duid.len, MDL); /* * Create an option cache to carry the IA_NA option contents, and * execute any user-supplied values into it. */ if (!option_state_allocate(&reply->reply_ia, MDL)) { status = ISC_R_NOMEMORY; goto cleanup; } /* Check & cache the fixed host record. */ if ((reply->host != NULL) && (reply->host->fixed_addr != NULL)) { struct iaddr tmp_addr; if (!evaluate_option_cache(&reply->fixed, NULL, NULL, NULL, NULL, NULL, &global_scope, reply->host->fixed_addr, MDL)) { log_error("reply_process_ia_na: unable to evaluate " "fixed address."); status = ISC_R_FAILURE; goto cleanup; } if (reply->fixed.len < 16) { log_error("reply_process_ia_na: invalid fixed address."); status = DHCP_R_INVALIDARG; goto cleanup; } /* Find the static lease's subnet. */ tmp_addr.len = 16; memcpy(tmp_addr.iabuf, reply->fixed.data, 16); if (find_grouped_subnet(&reply->subnet, reply->shared, tmp_addr, MDL) == 0) log_fatal("Impossible condition at %s:%d.", MDL); reply->static_lease = ISC_TRUE; } else reply->static_lease = ISC_FALSE; /* * Save the cursor position at the start of the IA, so we can * set length and adjust t1/t2 values later. We write a temporary * header out now just in case we decide to adjust the packet * within sub-process functions. */ ia_cursor = reply->cursor; /* Initialize the IA_NA header. First the code. */ putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_NA); reply->cursor += 2; /* Then option length. */ putUShort(reply->buf.data + reply->cursor, 0x0Cu); reply->cursor += 2; /* Then IA_NA header contents; IAID. */ putULong(reply->buf.data + reply->cursor, iaid); reply->cursor += 4; /* We store the client's t1 for now, and may over-ride it later. */ putULong(reply->buf.data + reply->cursor, reply->renew); reply->cursor += 4; /* We store the client's t2 for now, and may over-ride it later. */ putULong(reply->buf.data + reply->cursor, reply->rebind); reply->cursor += 4; /* * For each address in this IA_NA, decide what to do about it. * * Guidelines: * * The client leaves unchanged any infomation about addresses * it has recorded but are not included ("cancel/break" below). * A not included IA ("cleanup" below) could give a Renew/Rebind. */ oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAADDR); reply->valid = reply->prefer = 0xffffffff; reply->client_valid = reply->client_prefer = 0; for (; oc != NULL ; oc = oc->next) { status = reply_process_addr(reply, oc); /* * Canceled means we did not allocate addresses to the * client, but we're "done" with this IA - we set a status * code. So transmit this reply, e.g., move on to the next * IA. */ if (status == ISC_R_CANCELED) break; if ((status != ISC_R_SUCCESS) && (status != ISC_R_ADDRINUSE) && (status != ISC_R_ADDRNOTAVAIL)) goto cleanup; } reply->ia_count++; /* * If we fell through the above and never gave the client * an address, give it one now. */ if ((status != ISC_R_CANCELED) && (reply->client_resources == 0)) { status = find_client_address(reply); if (status == ISC_R_NORESOURCES) { switch (reply->packet->dhcpv6_msg_type) { case DHCPV6_SOLICIT: /* * No address for any IA is handled * by the caller. */ /* FALL THROUGH */ case DHCPV6_REQUEST: /* Section 18.2.1 (Request): * * If the server cannot assign any addresses to * an IA in the message from the client, the * server MUST include the IA in the Reply * message with no addresses in the IA and a * Status Code option in the IA containing * status code NoAddrsAvail. */ option_state_dereference(&reply->reply_ia, MDL); if (!option_state_allocate(&reply->reply_ia, MDL)) { log_error("reply_process_ia_na: No " "memory for option state " "wipe."); status = ISC_R_NOMEMORY; goto cleanup; } if (!set_status_code(STATUS_NoAddrsAvail, "No addresses available " "for this interface.", reply->reply_ia)) { log_error("reply_process_ia_na: Unable " "to set NoAddrsAvail status " "code."); status = ISC_R_FAILURE; goto cleanup; } status = ISC_R_SUCCESS; break; default: /* * RFC 3315 does not tell us to emit a status * code in this condition, or anything else. * * If we included non-allocated addresses * (zeroed lifetimes) in an IA, then the client * will deconfigure them. * * So we want to include the IA even if we * can't give it a new address if it includes * zeroed lifetime addresses. * * We don't want to include the IA if we * provide zero addresses including zeroed * lifetimes. */ if (reply->resources_included) status = ISC_R_SUCCESS; else goto cleanup; break; } } if (status != ISC_R_SUCCESS) goto cleanup; } reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, sizeof(reply->buf) - reply->cursor, reply->reply_ia, reply->packet, required_opts_IA, NULL); /* Reset the length of this IA to match what was just written. */ putUShort(reply->buf.data + ia_cursor + 2, reply->cursor - (ia_cursor + 4)); /* * T1/T2 time selection is kind of weird. We actually use DHCP * (v4) scoped options as handy existing places where these might * be configured by an administrator. A value of zero tells the * client it may choose its own renewal time. */ reply->renew = 0; oc = lookup_option(&dhcp_universe, reply->opt_state, DHO_DHCP_RENEWAL_TIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, &global_scope, oc, MDL) || (data.len != 4)) { log_error("Invalid renewal time."); } else { reply->renew = getULong(data.data); } if (data.data != NULL) data_string_forget(&data, MDL); } putULong(reply->buf.data + ia_cursor + 8, reply->renew); /* Now T2. */ reply->rebind = 0; oc = lookup_option(&dhcp_universe, reply->opt_state, DHO_DHCP_REBINDING_TIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, &global_scope, oc, MDL) || (data.len != 4)) { log_error("Invalid rebinding time."); } else { reply->rebind = getULong(data.data); } if (data.data != NULL) data_string_forget(&data, MDL); } putULong(reply->buf.data + ia_cursor + 12, reply->rebind); /* * If this is not a 'soft' binding, consume the new changes into * the database (if any have been attached to the ia_na). * * Loop through the assigned dynamic addresses, referencing the * leases onto this IA_NA rather than any old ones, and updating * pool timers for each (if any). */ if ((status != ISC_R_CANCELED) && !reply->static_lease && (reply->buf.reply.msg_type == DHCPV6_REPLY) && (reply->ia->num_iasubopt != 0)) { struct iasubopt *tmp; struct data_string *ia_id; int i; for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { tmp = reply->ia->iasubopt[i]; if (tmp->ia != NULL) ia_dereference(&tmp->ia, MDL); ia_reference(&tmp->ia, reply->ia, MDL); /* Commit 'hard' bindings. */ tmp->hard_lifetime_end_time = tmp->soft_lifetime_end_time; tmp->soft_lifetime_end_time = 0; renew_lease6(tmp->ipv6_pool, tmp); schedule_lease_timeout(tmp->ipv6_pool); #if defined (NSUPDATE) /* * Perform ddns updates. */ oc = lookup_option(&server_universe, reply->opt_state, SV_DDNS_UPDATES); if ((oc == NULL) || evaluate_boolean_option_cache(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, &tmp->scope, oc, MDL)) { ddns_updates(reply->packet, NULL, NULL, tmp, NULL, reply->opt_state); } #endif } /* Remove any old ia from the hash. */ if (reply->old_ia != NULL) { ia_id = &reply->old_ia->iaid_duid; ia_hash_delete(ia_na_active, (unsigned char *)ia_id->data, ia_id->len, MDL); ia_dereference(&reply->old_ia, MDL); } /* Put new ia into the hash. */ reply->ia->cltt = cur_time; ia_id = &reply->ia->iaid_duid; ia_hash_add(ia_na_active, (unsigned char *)ia_id->data, ia_id->len, reply->ia, MDL); write_ia(reply->ia); } cleanup: if (packet_ia != NULL) option_state_dereference(&packet_ia, MDL); if (reply->reply_ia != NULL) option_state_dereference(&reply->reply_ia, MDL); if (ia_data.data != NULL) data_string_forget(&ia_data, MDL); if (data.data != NULL) data_string_forget(&data, MDL); if (reply->ia != NULL) ia_dereference(&reply->ia, MDL); if (reply->old_ia != NULL) ia_dereference(&reply->old_ia, MDL); if (reply->lease != NULL) iasubopt_dereference(&reply->lease, MDL); if (reply->fixed.data != NULL) data_string_forget(&reply->fixed, MDL); if (reply->subnet != NULL) subnet_dereference(&reply->subnet, MDL); /* * ISC_R_CANCELED is a status code used by the addr processing to * indicate we're replying with a status code. This is still a * success at higher layers. */ return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); } /* * Process an IAADDR within a given IA_xA, storing any IAADDR reply contents * into the reply's current ia-scoped option cache. Returns ISC_R_CANCELED * in the event we are replying with a status code and do not wish to process * more IAADDRs within this IA. */ static isc_result_t reply_process_addr(struct reply_state *reply, struct option_cache *addr) { u_int32_t pref_life, valid_life; struct binding_scope **scope; struct group *group; struct subnet *subnet; struct iaddr tmp_addr; struct option_cache *oc; struct data_string iaaddr, data; isc_result_t status = ISC_R_SUCCESS; /* Initializes values that will be cleaned up. */ memset(&iaaddr, 0, sizeof(iaaddr)); memset(&data, 0, sizeof(data)); /* Note that reply->lease may be set by address_is_owned() */ /* * There is no point trying to process an incoming address if there * is no room for an outgoing address. */ if ((reply->cursor + 28) > sizeof(reply->buf)) { log_error("reply_process_addr: Out of room for address."); return ISC_R_NOSPACE; } /* Extract this IAADDR option. */ if (!evaluate_option_cache(&iaaddr, reply->packet, NULL, NULL, reply->packet->options, NULL, &global_scope, addr, MDL) || (iaaddr.len < IAADDR_OFFSET)) { log_error("reply_process_addr: error evaluating IAADDR."); status = ISC_R_FAILURE; goto cleanup; } /* The first 16 bytes are the IPv6 address. */ pref_life = getULong(iaaddr.data + 16); valid_life = getULong(iaaddr.data + 20); if ((reply->client_valid == 0) || (reply->client_valid > valid_life)) reply->client_valid = valid_life; if ((reply->client_prefer == 0) || (reply->client_prefer > pref_life)) reply->client_prefer = pref_life; /* * Clients may choose to send :: as an address, with the idea to give * hints about preferred-lifetime or valid-lifetime. */ tmp_addr.len = 16; memset(tmp_addr.iabuf, 0, 16); if (!memcmp(iaaddr.data, tmp_addr.iabuf, 16)) { /* Status remains success; we just ignore this one. */ goto cleanup; } /* tmp_addr len remains 16 */ memcpy(tmp_addr.iabuf, iaaddr.data, 16); /* * Verify that this address is on the client's network. */ for (subnet = reply->shared->subnets ; subnet != NULL ; subnet = subnet->next_sibling) { if (addr_eq(subnet_number(tmp_addr, subnet->netmask), subnet->net)) break; } /* Address not found on shared network. */ if (subnet == NULL) { /* Ignore this address on 'soft' bindings. */ if (reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) { /* disable rapid commit */ reply->buf.reply.msg_type = DHCPV6_ADVERTISE; delete_option(&dhcpv6_universe, reply->opt_state, D6O_RAPID_COMMIT); /* status remains success */ goto cleanup; } /* * RFC3315 section 18.2.1: * * If the server finds that the prefix on one or more IP * addresses in any IA in the message from the client is not * appropriate for the link to which the client is connected, * the server MUST return the IA to the client with a Status * Code option with the value NotOnLink. */ if (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) { /* Rewind the IA_NA to empty. */ option_state_dereference(&reply->reply_ia, MDL); if (!option_state_allocate(&reply->reply_ia, MDL)) { log_error("reply_process_addr: No memory for " "option state wipe."); status = ISC_R_NOMEMORY; goto cleanup; } /* Append a NotOnLink status code. */ if (!set_status_code(STATUS_NotOnLink, "Address not for use on this " "link.", reply->reply_ia)) { log_error("reply_process_addr: Failure " "setting status code."); status = ISC_R_FAILURE; goto cleanup; } /* Fin (no more IAADDRs). */ status = ISC_R_CANCELED; goto cleanup; } /* * RFC3315 sections 18.2.3 and 18.2.4 have identical language: * * If the server finds that any of the addresses are not * appropriate for the link to which the client is attached, * the server returns the address to the client with lifetimes * of 0. */ if ((reply->packet->dhcpv6_msg_type != DHCPV6_RENEW) && (reply->packet->dhcpv6_msg_type != DHCPV6_REBIND)) { log_error("It is impossible to lease a client that is " "not sending a solicit, request, renew, or " "rebind."); status = ISC_R_FAILURE; goto cleanup; } reply->send_prefer = reply->send_valid = 0; goto send_addr; } /* Verify the address belongs to the client. */ if (!address_is_owned(reply, &tmp_addr)) { /* * For solicit and request, any addresses included are * 'requested' addresses. For rebind, we actually have * no direction on what to do from 3315 section 18.2.4! * So I think the best bet is to try and give it out, and if * we can't, zero lifetimes. */ if ((reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) || (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) || (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND)) { status = reply_process_try_addr(reply, &tmp_addr); /* * If the address is in use, or isn't in any dynamic * range, continue as normal. If any other error was * found, error out. */ if ((status != ISC_R_SUCCESS) && (status != ISC_R_ADDRINUSE) && (status != ISC_R_ADDRNOTAVAIL)) goto cleanup; /* * If we didn't honor this lease, for solicit and * request we simply omit it from our answer. For * rebind, we send it with zeroed lifetimes. */ if (reply->lease == NULL) { if (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND) { reply->send_prefer = 0; reply->send_valid = 0; goto send_addr; } /* status remains success - ignore */ goto cleanup; } /* * RFC3315 section 18.2.3: * * If the server cannot find a client entry for the IA the * server returns the IA containing no addresses with a Status * Code option set to NoBinding in the Reply message. * * On mismatch we (ab)use this pretending we have not the IA * as soon as we have not an address. */ } else if (reply->packet->dhcpv6_msg_type == DHCPV6_RENEW) { /* Rewind the IA_NA to empty. */ option_state_dereference(&reply->reply_ia, MDL); if (!option_state_allocate(&reply->reply_ia, MDL)) { log_error("reply_process_addr: No memory for " "option state wipe."); status = ISC_R_NOMEMORY; goto cleanup; } /* Append a NoBinding status code. */ if (!set_status_code(STATUS_NoBinding, "Address not bound to this " "interface.", reply->reply_ia)) { log_error("reply_process_addr: Unable to " "attach status code."); status = ISC_R_FAILURE; goto cleanup; } /* Fin (no more IAADDRs). */ status = ISC_R_CANCELED; goto cleanup; } else { log_error("It is impossible to lease a client that is " "not sending a solicit, request, renew, or " "rebind message."); status = ISC_R_FAILURE; goto cleanup; } } if (reply->static_lease) { if (reply->host == NULL) log_fatal("Impossible condition at %s:%d.", MDL); scope = &global_scope; group = reply->subnet->group; } else { if (reply->lease == NULL) log_fatal("Impossible condition at %s:%d.", MDL); scope = &reply->lease->scope; group = reply->lease->ipv6_pool->subnet->group; } /* * If client_resources is nonzero, then the reply_process_is_addressed * function has executed configuration state into the reply option * cache. We will use that valid cache to derive configuration for * whether or not to engage in additional addresses, and similar. */ if (reply->client_resources != 0) { unsigned limit = 1; /* * Does this client have "enough" addresses already? Default * to one. Everybody gets one, and one should be enough for * anybody. */ oc = lookup_option(&server_universe, reply->opt_state, SV_LIMIT_ADDRS_PER_IA); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, oc, MDL) || (data.len != 4)) { log_error("reply_process_addr: unable to " "evaluate addrs-per-ia value."); status = ISC_R_FAILURE; goto cleanup; } limit = getULong(data.data); data_string_forget(&data, MDL); } /* * If we wish to limit the client to a certain number of * addresses, then omit the address from the reply. */ if (reply->client_resources >= limit) goto cleanup; } status = reply_process_is_addressed(reply, scope, group); if (status != ISC_R_SUCCESS) goto cleanup; send_addr: status = reply_process_send_addr(reply, &tmp_addr); cleanup: if (iaaddr.data != NULL) data_string_forget(&iaaddr, MDL); if (data.data != NULL) data_string_forget(&data, MDL); if (reply->lease != NULL) iasubopt_dereference(&reply->lease, MDL); return status; } /* * Verify the address belongs to the client. If we've got a host * record with a fixed address, it has to be the assigned address * (fault out all else). Otherwise it's a dynamic address, so lookup * that address and make sure it belongs to this DUID:IAID pair. */ static isc_boolean_t address_is_owned(struct reply_state *reply, struct iaddr *addr) { int i; /* * This faults out addresses that don't match fixed addresses. */ if (reply->static_lease) { if (reply->fixed.data == NULL) log_fatal("Impossible condition at %s:%d.", MDL); if (memcmp(addr->iabuf, reply->fixed.data, 16) == 0) return (ISC_TRUE); return (ISC_FALSE); } if ((reply->old_ia == NULL) || (reply->old_ia->num_iasubopt == 0)) return (ISC_FALSE); for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { struct iasubopt *tmp; tmp = reply->old_ia->iasubopt[i]; if (memcmp(addr->iabuf, &tmp->addr, 16) == 0) { if (lease6_usable(tmp) == ISC_FALSE) { return (ISC_FALSE); } iasubopt_reference(&reply->lease, tmp, MDL); return (ISC_TRUE); } } return (ISC_FALSE); } /* Process a client-supplied IA_TA. This may append options to the tail of * the reply packet being built in the reply_state structure. */ static isc_result_t reply_process_ia_ta(struct reply_state *reply, struct option_cache *ia) { isc_result_t status = ISC_R_SUCCESS; u_int32_t iaid; unsigned ia_cursor; struct option_state *packet_ia; struct option_cache *oc; struct data_string ia_data, data; struct data_string iaaddr; u_int32_t pref_life, valid_life; struct iaddr tmp_addr; /* Initialize values that will get cleaned up on return. */ packet_ia = NULL; memset(&ia_data, 0, sizeof(ia_data)); memset(&data, 0, sizeof(data)); memset(&iaaddr, 0, sizeof(iaaddr)); /* Make sure there is at least room for the header. */ if ((reply->cursor + IA_TA_OFFSET + 4) > sizeof(reply->buf)) { log_error("reply_process_ia_ta: Reply too long for IA."); return ISC_R_NOSPACE; } /* Fetch the IA_TA contents. */ if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, ia, IA_TA_OFFSET)) { log_error("reply_process_ia_ta: error evaluating ia"); status = ISC_R_FAILURE; goto cleanup; } /* Extract IA_TA header contents. */ iaid = getULong(ia_data.data); /* Create an IA_TA structure. */ if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, reply->client_id.len, MDL) != ISC_R_SUCCESS) { log_error("reply_process_ia_ta: no memory for ia."); status = ISC_R_NOMEMORY; goto cleanup; } reply->ia->ia_type = D6O_IA_TA; /* Cache pre-existing IA, if any. */ ia_hash_lookup(&reply->old_ia, ia_ta_active, (unsigned char *)reply->ia->iaid_duid.data, reply->ia->iaid_duid.len, MDL); /* * Create an option cache to carry the IA_TA option contents, and * execute any user-supplied values into it. */ if (!option_state_allocate(&reply->reply_ia, MDL)) { status = ISC_R_NOMEMORY; goto cleanup; } /* * Temporary leases are dynamic by definition. */ reply->static_lease = ISC_FALSE; /* * Save the cursor position at the start of the IA, so we can * set length later. We write a temporary * header out now just in case we decide to adjust the packet * within sub-process functions. */ ia_cursor = reply->cursor; /* Initialize the IA_TA header. First the code. */ putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_TA); reply->cursor += 2; /* Then option length. */ putUShort(reply->buf.data + reply->cursor, 0x04u); reply->cursor += 2; /* Then IA_TA header contents; IAID. */ putULong(reply->buf.data + reply->cursor, iaid); reply->cursor += 4; /* * Deal with an IAADDR for lifetimes. * For all or none, process IAADDRs as hints. */ reply->valid = reply->prefer = 0xffffffff; reply->client_valid = reply->client_prefer = 0; oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAADDR); for (; oc != NULL; oc = oc->next) { memset(&iaaddr, 0, sizeof(iaaddr)); if (!evaluate_option_cache(&iaaddr, reply->packet, NULL, NULL, reply->packet->options, NULL, &global_scope, oc, MDL) || (iaaddr.len < IAADDR_OFFSET)) { log_error("reply_process_ia_ta: error " "evaluating IAADDR."); status = ISC_R_FAILURE; goto cleanup; } /* The first 16 bytes are the IPv6 address. */ pref_life = getULong(iaaddr.data + 16); valid_life = getULong(iaaddr.data + 20); if ((reply->client_valid == 0) || (reply->client_valid > valid_life)) reply->client_valid = valid_life; if ((reply->client_prefer == 0) || (reply->client_prefer > pref_life)) reply->client_prefer = pref_life; /* Nothing more if something has failed. */ if (status == ISC_R_CANCELED) continue; tmp_addr.len = 16; memcpy(tmp_addr.iabuf, iaaddr.data, 16); if (!temporary_is_available(reply, &tmp_addr)) goto bad_temp; status = reply_process_is_addressed(reply, &reply->lease->scope, reply->shared->group); if (status != ISC_R_SUCCESS) goto bad_temp; status = reply_process_send_addr(reply, &tmp_addr); if (status != ISC_R_SUCCESS) goto bad_temp; if (reply->lease != NULL) iasubopt_dereference(&reply->lease, MDL); continue; bad_temp: /* Rewind the IA_TA to empty. */ option_state_dereference(&reply->reply_ia, MDL); if (!option_state_allocate(&reply->reply_ia, MDL)) { status = ISC_R_NOMEMORY; goto cleanup; } status = ISC_R_CANCELED; reply->client_resources = 0; reply->resources_included = ISC_FALSE; if (reply->lease != NULL) iasubopt_dereference(&reply->lease, MDL); } reply->ia_count++; /* * Give the client temporary addresses. */ if (reply->client_resources != 0) goto store; status = find_client_temporaries(reply); if (status == ISC_R_NORESOURCES) { switch (reply->packet->dhcpv6_msg_type) { case DHCPV6_SOLICIT: /* * No address for any IA is handled * by the caller. */ /* FALL THROUGH */ case DHCPV6_REQUEST: /* Section 18.2.1 (Request): * * If the server cannot assign any addresses to * an IA in the message from the client, the * server MUST include the IA in the Reply * message with no addresses in the IA and a * Status Code option in the IA containing * status code NoAddrsAvail. */ option_state_dereference(&reply->reply_ia, MDL); if (!option_state_allocate(&reply->reply_ia, MDL)) { log_error("reply_process_ia_ta: No " "memory for option state wipe."); status = ISC_R_NOMEMORY; goto cleanup; } if (!set_status_code(STATUS_NoAddrsAvail, "No addresses available " "for this interface.", reply->reply_ia)) { log_error("reply_process_ia_ta: Unable " "to set NoAddrsAvail status code."); status = ISC_R_FAILURE; goto cleanup; } status = ISC_R_SUCCESS; break; default: /* * We don't want to include the IA if we * provide zero addresses including zeroed * lifetimes. */ if (reply->resources_included) status = ISC_R_SUCCESS; else goto cleanup; break; } } else if (status != ISC_R_SUCCESS) goto cleanup; store: reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, sizeof(reply->buf) - reply->cursor, reply->reply_ia, reply->packet, required_opts_IA, NULL); /* Reset the length of this IA to match what was just written. */ putUShort(reply->buf.data + ia_cursor + 2, reply->cursor - (ia_cursor + 4)); /* * Consume the new changes into the database (if any have been * attached to the ia_ta). * * Loop through the assigned dynamic addresses, referencing the * leases onto this IA_TA rather than any old ones, and updating * pool timers for each (if any). */ if ((status != ISC_R_CANCELED) && (reply->buf.reply.msg_type == DHCPV6_REPLY) && (reply->ia->num_iasubopt != 0)) { struct iasubopt *tmp; struct data_string *ia_id; int i; for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { tmp = reply->ia->iasubopt[i]; if (tmp->ia != NULL) ia_dereference(&tmp->ia, MDL); ia_reference(&tmp->ia, reply->ia, MDL); /* Commit 'hard' bindings. */ tmp->hard_lifetime_end_time = tmp->soft_lifetime_end_time; tmp->soft_lifetime_end_time = 0; renew_lease6(tmp->ipv6_pool, tmp); schedule_lease_timeout(tmp->ipv6_pool); #if defined (NSUPDATE) /* * Perform ddns updates. */ oc = lookup_option(&server_universe, reply->opt_state, SV_DDNS_UPDATES); if ((oc == NULL) || evaluate_boolean_option_cache(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, &tmp->scope, oc, MDL)) { ddns_updates(reply->packet, NULL, NULL, tmp, NULL, reply->opt_state); } #endif } /* Remove any old ia from the hash. */ if (reply->old_ia != NULL) { ia_id = &reply->old_ia->iaid_duid; ia_hash_delete(ia_ta_active, (unsigned char *)ia_id->data, ia_id->len, MDL); ia_dereference(&reply->old_ia, MDL); } /* Put new ia into the hash. */ reply->ia->cltt = cur_time; ia_id = &reply->ia->iaid_duid; ia_hash_add(ia_ta_active, (unsigned char *)ia_id->data, ia_id->len, reply->ia, MDL); write_ia(reply->ia); } cleanup: if (packet_ia != NULL) option_state_dereference(&packet_ia, MDL); if (iaaddr.data != NULL) data_string_forget(&iaaddr, MDL); if (reply->reply_ia != NULL) option_state_dereference(&reply->reply_ia, MDL); if (ia_data.data != NULL) data_string_forget(&ia_data, MDL); if (data.data != NULL) data_string_forget(&data, MDL); if (reply->ia != NULL) ia_dereference(&reply->ia, MDL); if (reply->old_ia != NULL) ia_dereference(&reply->old_ia, MDL); if (reply->lease != NULL) iasubopt_dereference(&reply->lease, MDL); /* * ISC_R_CANCELED is a status code used by the addr processing to * indicate we're replying with other addresses. This is still a * success at higher layers. */ return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); } /* * Verify the temporary address is available. */ static isc_boolean_t temporary_is_available(struct reply_state *reply, struct iaddr *addr) { struct in6_addr tmp_addr; struct subnet *subnet; struct ipv6_pool *pool; int i; memcpy(&tmp_addr, addr->iabuf, sizeof(tmp_addr)); /* * Clients may choose to send :: as an address, with the idea to give * hints about preferred-lifetime or valid-lifetime. * So this is not a request for this address. */ if (IN6_IS_ADDR_UNSPECIFIED(&tmp_addr)) return ISC_FALSE; /* * Verify that this address is on the client's network. */ for (subnet = reply->shared->subnets ; subnet != NULL ; subnet = subnet->next_sibling) { if (addr_eq(subnet_number(*addr, subnet->netmask), subnet->net)) break; } /* Address not found on shared network. */ if (subnet == NULL) return ISC_FALSE; /* * Check if this address is owned (must be before next step). */ if (address_is_owned(reply, addr)) return ISC_TRUE; /* * Verify that this address is in a temporary pool and try to get it. */ if (reply->shared->ipv6_pools == NULL) return ISC_FALSE; for (i = 0 ; (pool = reply->shared->ipv6_pools[i]) != NULL ; i++) { if (pool->pool_type != D6O_IA_TA) continue; if (ipv6_in_pool(&tmp_addr, pool)) break; } if (pool == NULL) return ISC_FALSE; if (lease6_exists(pool, &tmp_addr)) return ISC_FALSE; if (iasubopt_allocate(&reply->lease, MDL) != ISC_R_SUCCESS) return ISC_FALSE; reply->lease->addr = tmp_addr; reply->lease->plen = 0; /* Default is soft binding for 2 minutes. */ if (add_lease6(pool, reply->lease, cur_time + 120) != ISC_R_SUCCESS) return ISC_FALSE; return ISC_TRUE; } /* * Get a temporary address per prefix. */ static isc_result_t find_client_temporaries(struct reply_state *reply) { struct shared_network *shared; int i; struct ipv6_pool *p; isc_result_t status; unsigned int attempts; struct iaddr send_addr; /* * No pools, we're done. */ shared = reply->shared; if (shared->ipv6_pools == NULL) { log_debug("Unable to get client addresses: " "no IPv6 pools on this shared network"); return ISC_R_NORESOURCES; } status = ISC_R_NORESOURCES; for (i = 0;; i++) { p = shared->ipv6_pools[i]; if (p == NULL) { break; } if (p->pool_type != D6O_IA_TA) { continue; } /* * Get an address in this temporary pool. */ status = create_lease6(p, &reply->lease, &attempts, &reply->client_id, cur_time + 120); if (status != ISC_R_SUCCESS) { log_debug("Unable to get a temporary address."); goto cleanup; } status = reply_process_is_addressed(reply, &reply->lease->scope, reply->lease->ipv6_pool->subnet->group); if (status != ISC_R_SUCCESS) { goto cleanup; } send_addr.len = 16; memcpy(send_addr.iabuf, &reply->lease->addr, 16); status = reply_process_send_addr(reply, &send_addr); if (status != ISC_R_SUCCESS) { goto cleanup; } if (reply->lease != NULL) { iasubopt_dereference(&reply->lease, MDL); } } cleanup: if (reply->lease != NULL) { iasubopt_dereference(&reply->lease, MDL); } return status; } /* * This function only returns failure on 'hard' failures. If it succeeds, * it will leave a lease structure behind. */ static isc_result_t reply_process_try_addr(struct reply_state *reply, struct iaddr *addr) { isc_result_t status = ISC_R_ADDRNOTAVAIL; struct ipv6_pool *pool; int i; struct data_string data_addr; if ((reply == NULL) || (reply->shared == NULL) || (addr == NULL) || (reply->lease != NULL)) return (DHCP_R_INVALIDARG); if (reply->shared->ipv6_pools == NULL) return (ISC_R_ADDRNOTAVAIL); memset(&data_addr, 0, sizeof(data_addr)); data_addr.len = addr->len; data_addr.data = addr->iabuf; for (i = 0 ; (pool = reply->shared->ipv6_pools[i]) != NULL ; i++) { if (pool->pool_type != D6O_IA_NA) continue; status = try_client_v6_address(&reply->lease, pool, &data_addr); if (status == ISC_R_SUCCESS) break; } /* Note that this is just pedantry. There is no allocation to free. */ data_string_forget(&data_addr, MDL); /* Return just the most recent status... */ return (status); } /* Look around for an address to give the client. First, look through the * old IA for addresses we can extend. Second, try to allocate a new address. * Finally, actually add that address into the current reply IA. */ static isc_result_t find_client_address(struct reply_state *reply) { struct iaddr send_addr; isc_result_t status = ISC_R_NORESOURCES; struct iasubopt *lease, *best_lease = NULL; struct binding_scope **scope; struct group *group; int i; if (reply->static_lease) { if (reply->host == NULL) return DHCP_R_INVALIDARG; send_addr.len = 16; memcpy(send_addr.iabuf, reply->fixed.data, 16); status = ISC_R_SUCCESS; scope = &global_scope; group = reply->subnet->group; goto send_addr; } if (reply->old_ia != NULL) { for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { struct shared_network *candidate_shared; lease = reply->old_ia->iasubopt[i]; candidate_shared = lease->ipv6_pool->shared_network; /* * Look for the best lease on the client's shared * network. */ if ((candidate_shared == reply->shared) && (lease6_usable(lease) == ISC_TRUE)) { best_lease = lease_compare(lease, best_lease); } } } /* Try to pick a new address if we didn't find one, or if we found an * abandoned lease. */ if ((best_lease == NULL) || (best_lease->state == FTS_ABANDONED)) { status = pick_v6_address(&reply->lease, reply->shared, &reply->ia->iaid_duid); } else if (best_lease != NULL) { iasubopt_reference(&reply->lease, best_lease, MDL); status = ISC_R_SUCCESS; } /* Pick the abandoned lease as a last resort. */ if ((status == ISC_R_NORESOURCES) && (best_lease != NULL)) { /* I don't see how this is supposed to be done right now. */ log_error("Reclaiming abandoned addresses is not yet " "supported. Treating this as an out of space " "condition."); /* iasubopt_reference(&reply->lease, best_lease, MDL); */ } /* Give up now if we didn't find a lease. */ if (status != ISC_R_SUCCESS) return status; if (reply->lease == NULL) log_fatal("Impossible condition at %s:%d.", MDL); /* Draw binding scopes from the lease's binding scope, and config * from the lease's containing subnet and higher. Note that it may * be desirable to place the group attachment directly in the pool. */ scope = &reply->lease->scope; group = reply->lease->ipv6_pool->subnet->group; send_addr.len = 16; memcpy(send_addr.iabuf, &reply->lease->addr, 16); send_addr: status = reply_process_is_addressed(reply, scope, group); if (status != ISC_R_SUCCESS) return status; status = reply_process_send_addr(reply, &send_addr); return status; } /* Once an address is found for a client, perform several common functions; * Calculate and store valid and preferred lease times, draw client options * into the option state. */ static isc_result_t reply_process_is_addressed(struct reply_state *reply, struct binding_scope **scope, struct group *group) { isc_result_t status = ISC_R_SUCCESS; struct data_string data; struct option_cache *oc; /* Initialize values we will cleanup. */ memset(&data, 0, sizeof(data)); /* * Bring configured options into the root packet level cache - start * with the lease's closest enclosing group (passed in by the caller * as 'group'). */ execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, group, root_group); /* * If there is a host record, over-ride with values configured there, * without re-evaluating configuration from the previously executed * group or its common enclosers. */ if (reply->host != NULL) execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, reply->host->group, group); /* Determine valid lifetime. */ if (reply->client_valid == 0) reply->send_valid = DEFAULT_DEFAULT_LEASE_TIME; else reply->send_valid = reply->client_valid; oc = lookup_option(&server_universe, reply->opt_state, SV_DEFAULT_LEASE_TIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, oc, MDL) || (data.len != 4)) { log_error("reply_process_is_addressed: unable to " "evaluate default lease time"); status = ISC_R_FAILURE; goto cleanup; } reply->send_valid = getULong(data.data); data_string_forget(&data, MDL); } if (reply->client_prefer == 0) reply->send_prefer = reply->send_valid; else reply->send_prefer = reply->client_prefer; if (reply->send_prefer >= reply->send_valid) reply->send_prefer = (reply->send_valid / 2) + (reply->send_valid / 8); oc = lookup_option(&server_universe, reply->opt_state, SV_PREFER_LIFETIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, oc, MDL) || (data.len != 4)) { log_error("reply_process_is_addressed: unable to " "evaluate preferred lease time"); status = ISC_R_FAILURE; goto cleanup; } reply->send_prefer = getULong(data.data); data_string_forget(&data, MDL); } /* Note lowest values for later calculation of renew/rebind times. */ if (reply->prefer > reply->send_prefer) reply->prefer = reply->send_prefer; if (reply->valid > reply->send_valid) reply->valid = reply->send_valid; #if 0 /* * XXX: Old 4.0.0 alpha code would change the host {} record * XXX: uid upon lease assignment. This was intended to cover the * XXX: case where a client first identifies itself using vendor * XXX: options in a solicit, or request, but later neglects to include * XXX: these options in a Renew or Rebind. It is not clear that this * XXX: is required, and has some startling ramifications (such as * XXX: how to recover this dynamic host {} state across restarts). */ if (reply->host != NULL) change_host_uid(host, reply->client_id->data, reply->client_id->len); #endif /* 0 */ /* Perform dynamic lease related update work. */ if (reply->lease != NULL) { /* Cached lifetimes */ reply->lease->prefer = reply->send_prefer; reply->lease->valid = reply->send_valid; /* Advance (or rewind) the valid lifetime. */ if (reply->buf.reply.msg_type == DHCPV6_REPLY) { reply->lease->soft_lifetime_end_time = cur_time + reply->send_valid; /* Wait before renew! */ } status = ia_add_iasubopt(reply->ia, reply->lease, MDL); if (status != ISC_R_SUCCESS) { log_fatal("reply_process_is_addressed: Unable to " "attach lease to new IA: %s", isc_result_totext(status)); } /* * If this is a new lease, make sure it is attached somewhere. */ if (reply->lease->ia == NULL) { ia_reference(&reply->lease->ia, reply->ia, MDL); } } /* Bring a copy of the relevant options into the IA scope. */ execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->reply_ia, scope, group, root_group); /* * And bring in host record configuration, if any, but not to overlap * the previous group or its common enclosers. */ if (reply->host != NULL) execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->reply_ia, scope, reply->host->group, group); cleanup: if (data.data != NULL) data_string_forget(&data, MDL); if (status == ISC_R_SUCCESS) reply->client_resources++; return status; } /* Simply send an IAADDR within the IA scope as described. */ static isc_result_t reply_process_send_addr(struct reply_state *reply, struct iaddr *addr) { isc_result_t status = ISC_R_SUCCESS; struct data_string data; memset(&data, 0, sizeof(data)); /* Now append the lease. */ data.len = IAADDR_OFFSET; if (!buffer_allocate(&data.buffer, data.len, MDL)) { log_error("reply_process_send_addr: out of memory" "allocating new IAADDR buffer."); status = ISC_R_NOMEMORY; goto cleanup; } data.data = data.buffer->data; memcpy(data.buffer->data, addr->iabuf, 16); putULong(data.buffer->data + 16, reply->send_prefer); putULong(data.buffer->data + 20, reply->send_valid); if (!append_option_buffer(&dhcpv6_universe, reply->reply_ia, data.buffer, data.buffer->data, data.len, D6O_IAADDR, 0)) { log_error("reply_process_send_addr: unable " "to save IAADDR option"); status = ISC_R_FAILURE; goto cleanup; } reply->resources_included = ISC_TRUE; cleanup: if (data.data != NULL) data_string_forget(&data, MDL); return status; } /* Choose the better of two leases. */ static struct iasubopt * lease_compare(struct iasubopt *alpha, struct iasubopt *beta) { if (alpha == NULL) return beta; if (beta == NULL) return alpha; switch(alpha->state) { case FTS_ACTIVE: switch(beta->state) { case FTS_ACTIVE: /* Choose the lease with the longest lifetime (most * likely the most recently allocated). */ if (alpha->hard_lifetime_end_time < beta->hard_lifetime_end_time) return beta; else return alpha; case FTS_EXPIRED: case FTS_ABANDONED: return alpha; default: log_fatal("Impossible condition at %s:%d.", MDL); } break; case FTS_EXPIRED: switch (beta->state) { case FTS_ACTIVE: return beta; case FTS_EXPIRED: /* Choose the most recently expired lease. */ if (alpha->hard_lifetime_end_time < beta->hard_lifetime_end_time) return beta; else if ((alpha->hard_lifetime_end_time == beta->hard_lifetime_end_time) && (alpha->soft_lifetime_end_time < beta->soft_lifetime_end_time)) return beta; else return alpha; case FTS_ABANDONED: return alpha; default: log_fatal("Impossible condition at %s:%d.", MDL); } break; case FTS_ABANDONED: switch (beta->state) { case FTS_ACTIVE: case FTS_EXPIRED: return alpha; case FTS_ABANDONED: /* Choose the lease that was abandoned longest ago. */ if (alpha->hard_lifetime_end_time < beta->hard_lifetime_end_time) return alpha; default: log_fatal("Impossible condition at %s:%d.", MDL); } break; default: log_fatal("Impossible condition at %s:%d.", MDL); } log_fatal("Triple impossible condition at %s:%d.", MDL); return NULL; } /* Process a client-supplied IA_PD. This may append options to the tail of * the reply packet being built in the reply_state structure. */ static isc_result_t reply_process_ia_pd(struct reply_state *reply, struct option_cache *ia) { isc_result_t status = ISC_R_SUCCESS; u_int32_t iaid; unsigned ia_cursor; struct option_state *packet_ia; struct option_cache *oc; struct data_string ia_data, data; /* Initialize values that will get cleaned up on return. */ packet_ia = NULL; memset(&ia_data, 0, sizeof(ia_data)); memset(&data, 0, sizeof(data)); /* * Note that find_client_prefix() may set reply->lease. */ /* Make sure there is at least room for the header. */ if ((reply->cursor + IA_PD_OFFSET + 4) > sizeof(reply->buf)) { log_error("reply_process_ia_pd: Reply too long for IA."); return ISC_R_NOSPACE; } /* Fetch the IA_PD contents. */ if (!get_encapsulated_IA_state(&packet_ia, &ia_data, reply->packet, ia, IA_PD_OFFSET)) { log_error("reply_process_ia_pd: error evaluating ia"); status = ISC_R_FAILURE; goto cleanup; } /* Extract IA_PD header contents. */ iaid = getULong(ia_data.data); reply->renew = getULong(ia_data.data + 4); reply->rebind = getULong(ia_data.data + 8); /* Create an IA_PD structure. */ if (ia_allocate(&reply->ia, iaid, (char *)reply->client_id.data, reply->client_id.len, MDL) != ISC_R_SUCCESS) { log_error("reply_process_ia_pd: no memory for ia."); status = ISC_R_NOMEMORY; goto cleanup; } reply->ia->ia_type = D6O_IA_PD; /* Cache pre-existing IA_PD, if any. */ ia_hash_lookup(&reply->old_ia, ia_pd_active, (unsigned char *)reply->ia->iaid_duid.data, reply->ia->iaid_duid.len, MDL); /* * Create an option cache to carry the IA_PD option contents, and * execute any user-supplied values into it. */ if (!option_state_allocate(&reply->reply_ia, MDL)) { status = ISC_R_NOMEMORY; goto cleanup; } /* Check & count the fixed prefix host records. */ reply->static_prefixes = 0; if ((reply->host != NULL) && (reply->host->fixed_prefix != NULL)) { struct iaddrcidrnetlist *fp; for (fp = reply->host->fixed_prefix; fp != NULL; fp = fp->next) { reply->static_prefixes += 1; } } /* * Save the cursor position at the start of the IA_PD, so we can * set length and adjust t1/t2 values later. We write a temporary * header out now just in case we decide to adjust the packet * within sub-process functions. */ ia_cursor = reply->cursor; /* Initialize the IA_PD header. First the code. */ putUShort(reply->buf.data + reply->cursor, (unsigned)D6O_IA_PD); reply->cursor += 2; /* Then option length. */ putUShort(reply->buf.data + reply->cursor, 0x0Cu); reply->cursor += 2; /* Then IA_PD header contents; IAID. */ putULong(reply->buf.data + reply->cursor, iaid); reply->cursor += 4; /* We store the client's t1 for now, and may over-ride it later. */ putULong(reply->buf.data + reply->cursor, reply->renew); reply->cursor += 4; /* We store the client's t2 for now, and may over-ride it later. */ putULong(reply->buf.data + reply->cursor, reply->rebind); reply->cursor += 4; /* * For each prefix in this IA_PD, decide what to do about it. */ oc = lookup_option(&dhcpv6_universe, packet_ia, D6O_IAPREFIX); reply->valid = reply->prefer = 0xffffffff; reply->client_valid = reply->client_prefer = 0; reply->preflen = -1; for (; oc != NULL ; oc = oc->next) { status = reply_process_prefix(reply, oc); /* * Canceled means we did not allocate prefixes to the * client, but we're "done" with this IA - we set a status * code. So transmit this reply, e.g., move on to the next * IA. */ if (status == ISC_R_CANCELED) break; if ((status != ISC_R_SUCCESS) && (status != ISC_R_ADDRINUSE) && (status != ISC_R_ADDRNOTAVAIL)) goto cleanup; } reply->pd_count++; /* * If we fell through the above and never gave the client * a prefix, give it one now. */ if ((status != ISC_R_CANCELED) && (reply->client_resources == 0)) { status = find_client_prefix(reply); if (status == ISC_R_NORESOURCES) { switch (reply->packet->dhcpv6_msg_type) { case DHCPV6_SOLICIT: /* * No prefix for any IA is handled * by the caller. */ /* FALL THROUGH */ case DHCPV6_REQUEST: /* Same than for addresses. */ option_state_dereference(&reply->reply_ia, MDL); if (!option_state_allocate(&reply->reply_ia, MDL)) { log_error("reply_process_ia_pd: No " "memory for option state " "wipe."); status = ISC_R_NOMEMORY; goto cleanup; } if (!set_status_code(STATUS_NoPrefixAvail, "No prefixes available " "for this interface.", reply->reply_ia)) { log_error("reply_process_ia_pd: " "Unable to set " "NoPrefixAvail status " "code."); status = ISC_R_FAILURE; goto cleanup; } status = ISC_R_SUCCESS; break; default: if (reply->resources_included) status = ISC_R_SUCCESS; else goto cleanup; break; } } if (status != ISC_R_SUCCESS) goto cleanup; } reply->cursor += store_options6((char *)reply->buf.data + reply->cursor, sizeof(reply->buf) - reply->cursor, reply->reply_ia, reply->packet, required_opts_IA_PD, NULL); /* Reset the length of this IA_PD to match what was just written. */ putUShort(reply->buf.data + ia_cursor + 2, reply->cursor - (ia_cursor + 4)); /* * T1/T2 time selection is kind of weird. We actually use DHCP * (v4) scoped options as handy existing places where these might * be configured by an administrator. A value of zero tells the * client it may choose its own renewal time. */ reply->renew = 0; oc = lookup_option(&dhcp_universe, reply->opt_state, DHO_DHCP_RENEWAL_TIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, &global_scope, oc, MDL) || (data.len != 4)) { log_error("Invalid renewal time."); } else { reply->renew = getULong(data.data); } if (data.data != NULL) data_string_forget(&data, MDL); } putULong(reply->buf.data + ia_cursor + 8, reply->renew); /* Now T2. */ reply->rebind = 0; oc = lookup_option(&dhcp_universe, reply->opt_state, DHO_DHCP_REBINDING_TIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, &global_scope, oc, MDL) || (data.len != 4)) { log_error("Invalid rebinding time."); } else { reply->rebind = getULong(data.data); } if (data.data != NULL) data_string_forget(&data, MDL); } putULong(reply->buf.data + ia_cursor + 12, reply->rebind); /* * If this is not a 'soft' binding, consume the new changes into * the database (if any have been attached to the ia_pd). * * Loop through the assigned dynamic prefixes, referencing the * prefixes onto this IA_PD rather than any old ones, and updating * prefix pool timers for each (if any). */ if ((status != ISC_R_CANCELED) && (reply->static_prefixes == 0) && (reply->buf.reply.msg_type == DHCPV6_REPLY) && (reply->ia->num_iasubopt != 0)) { struct iasubopt *tmp; struct data_string *ia_id; int i; for (i = 0 ; i < reply->ia->num_iasubopt ; i++) { tmp = reply->ia->iasubopt[i]; if (tmp->ia != NULL) ia_dereference(&tmp->ia, MDL); ia_reference(&tmp->ia, reply->ia, MDL); /* Commit 'hard' bindings. */ tmp->hard_lifetime_end_time = tmp->soft_lifetime_end_time; tmp->soft_lifetime_end_time = 0; renew_lease6(tmp->ipv6_pool, tmp); schedule_lease_timeout(tmp->ipv6_pool); } /* Remove any old ia from the hash. */ if (reply->old_ia != NULL) { ia_id = &reply->old_ia->iaid_duid; ia_hash_delete(ia_pd_active, (unsigned char *)ia_id->data, ia_id->len, MDL); ia_dereference(&reply->old_ia, MDL); } /* Put new ia into the hash. */ reply->ia->cltt = cur_time; ia_id = &reply->ia->iaid_duid; ia_hash_add(ia_pd_active, (unsigned char *)ia_id->data, ia_id->len, reply->ia, MDL); write_ia(reply->ia); } cleanup: if (packet_ia != NULL) option_state_dereference(&packet_ia, MDL); if (reply->reply_ia != NULL) option_state_dereference(&reply->reply_ia, MDL); if (ia_data.data != NULL) data_string_forget(&ia_data, MDL); if (data.data != NULL) data_string_forget(&data, MDL); if (reply->ia != NULL) ia_dereference(&reply->ia, MDL); if (reply->old_ia != NULL) ia_dereference(&reply->old_ia, MDL); if (reply->lease != NULL) iasubopt_dereference(&reply->lease, MDL); /* * ISC_R_CANCELED is a status code used by the prefix processing to * indicate we're replying with a status code. This is still a * success at higher layers. */ return((status == ISC_R_CANCELED) ? ISC_R_SUCCESS : status); } /* * Process an IAPREFIX within a given IA_PD, storing any IAPREFIX reply * contents into the reply's current ia_pd-scoped option cache. Returns * ISC_R_CANCELED in the event we are replying with a status code and do * not wish to process more IAPREFIXes within this IA_PD. */ static isc_result_t reply_process_prefix(struct reply_state *reply, struct option_cache *pref) { u_int32_t pref_life, valid_life; struct binding_scope **scope; struct iaddrcidrnet tmp_pref; struct option_cache *oc; struct data_string iapref, data; isc_result_t status = ISC_R_SUCCESS; /* Initializes values that will be cleaned up. */ memset(&iapref, 0, sizeof(iapref)); memset(&data, 0, sizeof(data)); /* Note that reply->lease may be set by prefix_is_owned() */ /* * There is no point trying to process an incoming prefix if there * is no room for an outgoing prefix. */ if ((reply->cursor + 29) > sizeof(reply->buf)) { log_error("reply_process_prefix: Out of room for prefix."); return ISC_R_NOSPACE; } /* Extract this IAPREFIX option. */ if (!evaluate_option_cache(&iapref, reply->packet, NULL, NULL, reply->packet->options, NULL, &global_scope, pref, MDL) || (iapref.len < IAPREFIX_OFFSET)) { log_error("reply_process_prefix: error evaluating IAPREFIX."); status = ISC_R_FAILURE; goto cleanup; } /* * Layout: preferred and valid lifetimes followed by the prefix * length and the IPv6 address. */ pref_life = getULong(iapref.data); valid_life = getULong(iapref.data + 4); if ((reply->client_valid == 0) || (reply->client_valid > valid_life)) reply->client_valid = valid_life; if ((reply->client_prefer == 0) || (reply->client_prefer > pref_life)) reply->client_prefer = pref_life; /* * Clients may choose to send ::/0 as a prefix, with the idea to give * hints about preferred-lifetime or valid-lifetime. */ tmp_pref.lo_addr.len = 16; memset(tmp_pref.lo_addr.iabuf, 0, 16); if ((iapref.data[8] == 0) && (memcmp(iapref.data + 9, tmp_pref.lo_addr.iabuf, 16) == 0)) { /* Status remains success; we just ignore this one. */ goto cleanup; } /* * Clients may choose to send ::/X as a prefix to specify a * preferred/requested prefix length. Note X is never zero here. */ tmp_pref.bits = (int) iapref.data[8]; if (reply->preflen < 0) { /* Cache the first preferred prefix length. */ reply->preflen = tmp_pref.bits; } if (memcmp(iapref.data + 9, tmp_pref.lo_addr.iabuf, 16) == 0) { goto cleanup; } memcpy(tmp_pref.lo_addr.iabuf, iapref.data + 9, 16); /* Verify the prefix belongs to the client. */ if (!prefix_is_owned(reply, &tmp_pref)) { /* Same than for addresses. */ if ((reply->packet->dhcpv6_msg_type == DHCPV6_SOLICIT) || (reply->packet->dhcpv6_msg_type == DHCPV6_REQUEST) || (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND)) { status = reply_process_try_prefix(reply, &tmp_pref); /* Either error out or skip this prefix. */ if ((status != ISC_R_SUCCESS) && (status != ISC_R_ADDRINUSE) && (status != ISC_R_ADDRNOTAVAIL)) goto cleanup; if (reply->lease == NULL) { if (reply->packet->dhcpv6_msg_type == DHCPV6_REBIND) { reply->send_prefer = 0; reply->send_valid = 0; goto send_pref; } /* status remains success - ignore */ goto cleanup; } /* * RFC3633 section 18.2.3: * * If the delegating router cannot find a binding * for the requesting router's IA_PD the delegating * router returns the IA_PD containing no prefixes * with a Status Code option set to NoBinding in the * Reply message. * * On mismatch we (ab)use this pretending we have not the IA * as soon as we have not a prefix. */ } else if (reply->packet->dhcpv6_msg_type == DHCPV6_RENEW) { /* Rewind the IA_PD to empty. */ option_state_dereference(&reply->reply_ia, MDL); if (!option_state_allocate(&reply->reply_ia, MDL)) { log_error("reply_process_prefix: No memory " "for option state wipe."); status = ISC_R_NOMEMORY; goto cleanup; } /* Append a NoBinding status code. */ if (!set_status_code(STATUS_NoBinding, "Prefix not bound to this " "interface.", reply->reply_ia)) { log_error("reply_process_prefix: Unable to " "attach status code."); status = ISC_R_FAILURE; goto cleanup; } /* Fin (no more IAPREFIXes). */ status = ISC_R_CANCELED; goto cleanup; } else { log_error("It is impossible to lease a client that is " "not sending a solicit, request, renew, or " "rebind message."); status = ISC_R_FAILURE; goto cleanup; } } if (reply->static_prefixes > 0) { if (reply->host == NULL) log_fatal("Impossible condition at %s:%d.", MDL); scope = &global_scope; } else { if (reply->lease == NULL) log_fatal("Impossible condition at %s:%d.", MDL); scope = &reply->lease->scope; } /* * If client_resources is nonzero, then the reply_process_is_prefixed * function has executed configuration state into the reply option * cache. We will use that valid cache to derive configuration for * whether or not to engage in additional prefixes, and similar. */ if (reply->client_resources != 0) { unsigned limit = 1; /* * Does this client have "enough" prefixes already? Default * to one. Everybody gets one, and one should be enough for * anybody. */ oc = lookup_option(&server_universe, reply->opt_state, SV_LIMIT_PREFS_PER_IA); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, oc, MDL) || (data.len != 4)) { log_error("reply_process_prefix: unable to " "evaluate prefs-per-ia value."); status = ISC_R_FAILURE; goto cleanup; } limit = getULong(data.data); data_string_forget(&data, MDL); } /* * If we wish to limit the client to a certain number of * prefixes, then omit the prefix from the reply. */ if (reply->client_resources >= limit) goto cleanup; } status = reply_process_is_prefixed(reply, scope, reply->shared->group); if (status != ISC_R_SUCCESS) goto cleanup; send_pref: status = reply_process_send_prefix(reply, &tmp_pref); cleanup: if (iapref.data != NULL) data_string_forget(&iapref, MDL); if (data.data != NULL) data_string_forget(&data, MDL); if (reply->lease != NULL) iasubopt_dereference(&reply->lease, MDL); return status; } /* * Verify the prefix belongs to the client. If we've got a host * record with fixed prefixes, it has to be an assigned prefix * (fault out all else). Otherwise it's a dynamic prefix, so lookup * that prefix and make sure it belongs to this DUID:IAID pair. */ static isc_boolean_t prefix_is_owned(struct reply_state *reply, struct iaddrcidrnet *pref) { struct iaddrcidrnetlist *l; int i; /* * This faults out prefixes that don't match fixed prefixes. */ if (reply->static_prefixes > 0) { for (l = reply->host->fixed_prefix; l != NULL; l = l->next) { if ((pref->bits == l->cidrnet.bits) && (memcmp(pref->lo_addr.iabuf, l->cidrnet.lo_addr.iabuf, 16) == 0)) return (ISC_TRUE); } return (ISC_FALSE); } if ((reply->old_ia == NULL) || (reply->old_ia->num_iasubopt == 0)) return (ISC_FALSE); for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { struct iasubopt *tmp; tmp = reply->old_ia->iasubopt[i]; if ((pref->bits == (int) tmp->plen) && (memcmp(pref->lo_addr.iabuf, &tmp->addr, 16) == 0)) { if (lease6_usable(tmp) == ISC_FALSE) { return (ISC_FALSE); } iasubopt_reference(&reply->lease, tmp, MDL); return (ISC_TRUE); } } return (ISC_FALSE); } /* * This function only returns failure on 'hard' failures. If it succeeds, * it will leave a prefix structure behind. */ static isc_result_t reply_process_try_prefix(struct reply_state *reply, struct iaddrcidrnet *pref) { isc_result_t status = ISC_R_ADDRNOTAVAIL; struct ipv6_pool *pool; int i; struct data_string data_pref; if ((reply == NULL) || (reply->shared == NULL) || (pref == NULL) || (reply->lease != NULL)) return (DHCP_R_INVALIDARG); if (reply->shared->ipv6_pools == NULL) return (ISC_R_ADDRNOTAVAIL); memset(&data_pref, 0, sizeof(data_pref)); data_pref.len = 17; if (!buffer_allocate(&data_pref.buffer, data_pref.len, MDL)) { log_error("reply_process_try_prefix: out of memory."); return (ISC_R_NOMEMORY); } data_pref.data = data_pref.buffer->data; data_pref.buffer->data[0] = (u_int8_t) pref->bits; memcpy(data_pref.buffer->data + 1, pref->lo_addr.iabuf, 16); for (i = 0 ; (pool = reply->shared->ipv6_pools[i]) != NULL ; i++) { if (pool->pool_type != D6O_IA_PD) continue; status = try_client_v6_prefix(&reply->lease, pool, &data_pref); /* If we found it in this pool (either in use or available), there is no need to look further. */ if ( (status == ISC_R_SUCCESS) || (status == ISC_R_ADDRINUSE) ) break; } data_string_forget(&data_pref, MDL); /* Return just the most recent status... */ return (status); } /* Look around for a prefix to give the client. First, look through the old * IA_PD for prefixes we can extend. Second, try to allocate a new prefix. * Finally, actually add that prefix into the current reply IA_PD. */ static isc_result_t find_client_prefix(struct reply_state *reply) { struct iaddrcidrnet send_pref; isc_result_t status = ISC_R_NORESOURCES; struct iasubopt *prefix, *best_prefix = NULL; struct binding_scope **scope; int i; if (reply->static_prefixes > 0) { struct iaddrcidrnetlist *l; if (reply->host == NULL) return DHCP_R_INVALIDARG; for (l = reply->host->fixed_prefix; l != NULL; l = l->next) { if (l->cidrnet.bits == reply->preflen) break; } if (l == NULL) { /* * If no fixed prefix has the preferred length, * get the first one. */ l = reply->host->fixed_prefix; } memcpy(&send_pref, &l->cidrnet, sizeof(send_pref)); status = ISC_R_SUCCESS; scope = &global_scope; goto send_pref; } if (reply->old_ia != NULL) { for (i = 0 ; i < reply->old_ia->num_iasubopt ; i++) { struct shared_network *candidate_shared; prefix = reply->old_ia->iasubopt[i]; candidate_shared = prefix->ipv6_pool->shared_network; /* * Consider this prefix if it is in a global pool or * if it is scoped in a pool under the client's shared * network. */ if (((candidate_shared == NULL) || (candidate_shared == reply->shared)) && (lease6_usable(prefix) == ISC_TRUE)) { best_prefix = prefix_compare(reply, prefix, best_prefix); } } } /* Try to pick a new prefix if we didn't find one, or if we found an * abandoned prefix. */ if ((best_prefix == NULL) || (best_prefix->state == FTS_ABANDONED)) { status = pick_v6_prefix(&reply->lease, reply->preflen, reply->shared, &reply->client_id); } else if (best_prefix != NULL) { iasubopt_reference(&reply->lease, best_prefix, MDL); status = ISC_R_SUCCESS; } /* Pick the abandoned prefix as a last resort. */ if ((status == ISC_R_NORESOURCES) && (best_prefix != NULL)) { /* I don't see how this is supposed to be done right now. */ log_error("Reclaiming abandoned prefixes is not yet " "supported. Treating this as an out of space " "condition."); /* iasubopt_reference(&reply->lease, best_prefix, MDL); */ } /* Give up now if we didn't find a prefix. */ if (status != ISC_R_SUCCESS) return status; if (reply->lease == NULL) log_fatal("Impossible condition at %s:%d.", MDL); scope = &reply->lease->scope; send_pref.lo_addr.len = 16; memcpy(send_pref.lo_addr.iabuf, &reply->lease->addr, 16); send_pref.bits = (int) reply->lease->plen; send_pref: status = reply_process_is_prefixed(reply, scope, reply->shared->group); if (status != ISC_R_SUCCESS) return status; status = reply_process_send_prefix(reply, &send_pref); return status; } /* Once a prefix is found for a client, perform several common functions; * Calculate and store valid and preferred prefix times, draw client options * into the option state. */ static isc_result_t reply_process_is_prefixed(struct reply_state *reply, struct binding_scope **scope, struct group *group) { isc_result_t status = ISC_R_SUCCESS; struct data_string data; struct option_cache *oc; /* Initialize values we will cleanup. */ memset(&data, 0, sizeof(data)); /* * Bring configured options into the root packet level cache - start * with the lease's closest enclosing group (passed in by the caller * as 'group'). */ execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, group, root_group); /* * If there is a host record, over-ride with values configured there, * without re-evaluating configuration from the previously executed * group or its common enclosers. */ if (reply->host != NULL) execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, reply->host->group, group); /* Determine valid lifetime. */ if (reply->client_valid == 0) reply->send_valid = DEFAULT_DEFAULT_LEASE_TIME; else reply->send_valid = reply->client_valid; oc = lookup_option(&server_universe, reply->opt_state, SV_DEFAULT_LEASE_TIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, oc, MDL) || (data.len != 4)) { log_error("reply_process_is_prefixed: unable to " "evaluate default prefix time"); status = ISC_R_FAILURE; goto cleanup; } reply->send_valid = getULong(data.data); data_string_forget(&data, MDL); } if (reply->client_prefer == 0) reply->send_prefer = reply->send_valid; else reply->send_prefer = reply->client_prefer; if (reply->send_prefer >= reply->send_valid) reply->send_prefer = (reply->send_valid / 2) + (reply->send_valid / 8); oc = lookup_option(&server_universe, reply->opt_state, SV_PREFER_LIFETIME); if (oc != NULL) { if (!evaluate_option_cache(&data, reply->packet, NULL, NULL, reply->packet->options, reply->opt_state, scope, oc, MDL) || (data.len != 4)) { log_error("reply_process_is_prefixed: unable to " "evaluate preferred prefix time"); status = ISC_R_FAILURE; goto cleanup; } reply->send_prefer = getULong(data.data); data_string_forget(&data, MDL); } /* Note lowest values for later calculation of renew/rebind times. */ if (reply->prefer > reply->send_prefer) reply->prefer = reply->send_prefer; if (reply->valid > reply->send_valid) reply->valid = reply->send_valid; /* Perform dynamic prefix related update work. */ if (reply->lease != NULL) { /* Cached lifetimes */ reply->lease->prefer = reply->send_prefer; reply->lease->valid = reply->send_valid; /* Advance (or rewind) the valid lifetime. */ if (reply->buf.reply.msg_type == DHCPV6_REPLY) { reply->lease->soft_lifetime_end_time = cur_time + reply->send_valid; /* Wait before renew! */ } status = ia_add_iasubopt(reply->ia, reply->lease, MDL); if (status != ISC_R_SUCCESS) { log_fatal("reply_process_is_prefixed: Unable to " "attach prefix to new IA_PD: %s", isc_result_totext(status)); } /* * If this is a new prefix, make sure it is attached somewhere. */ if (reply->lease->ia == NULL) { ia_reference(&reply->lease->ia, reply->ia, MDL); } } /* Bring a copy of the relevant options into the IA_PD scope. */ execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->reply_ia, scope, group, root_group); /* * And bring in host record configuration, if any, but not to overlap * the previous group or its common enclosers. */ if (reply->host != NULL) execute_statements_in_scope(NULL, reply->packet, NULL, NULL, reply->packet->options, reply->reply_ia, scope, reply->host->group, group); cleanup: if (data.data != NULL) data_string_forget(&data, MDL); if (status == ISC_R_SUCCESS) reply->client_resources++; return status; } /* Simply send an IAPREFIX within the IA_PD scope as described. */ static isc_result_t reply_process_send_prefix(struct reply_state *reply, struct iaddrcidrnet *pref) { isc_result_t status = ISC_R_SUCCESS; struct data_string data; memset(&data, 0, sizeof(data)); /* Now append the prefix. */ data.len = IAPREFIX_OFFSET; if (!buffer_allocate(&data.buffer, data.len, MDL)) { log_error("reply_process_send_prefix: out of memory" "allocating new IAPREFIX buffer."); status = ISC_R_NOMEMORY; goto cleanup; } data.data = data.buffer->data; putULong(data.buffer->data, reply->send_prefer); putULong(data.buffer->data + 4, reply->send_valid); data.buffer->data[8] = pref->bits; memcpy(data.buffer->data + 9, pref->lo_addr.iabuf, 16); if (!append_option_buffer(&dhcpv6_universe, reply->reply_ia, data.buffer, data.buffer->data, data.len, D6O_IAPREFIX, 0)) { log_error("reply_process_send_prefix: unable " "to save IAPREFIX option"); status = ISC_R_FAILURE; goto cleanup; } reply->resources_included = ISC_TRUE; cleanup: if (data.data != NULL) data_string_forget(&data, MDL); return status; } /* Choose the better of two prefixes. */ static struct iasubopt * prefix_compare(struct reply_state *reply, struct iasubopt *alpha, struct iasubopt *beta) { if (alpha == NULL) return beta; if (beta == NULL) return alpha; if (reply->preflen >= 0) { if ((alpha->plen == reply->preflen) && (beta->plen != reply->preflen)) return alpha; if ((beta->plen == reply->preflen) && (alpha->plen != reply->preflen)) return beta; } switch(alpha->state) { case FTS_ACTIVE: switch(beta->state) { case FTS_ACTIVE: /* Choose the prefix with the longest lifetime (most * likely the most recently allocated). */ if (alpha->hard_lifetime_end_time < beta->hard_lifetime_end_time) return beta; else return alpha; case FTS_EXPIRED: case FTS_ABANDONED: return alpha; default: log_fatal("Impossible condition at %s:%d.", MDL); } break; case FTS_EXPIRED: switch (beta->state) { case FTS_ACTIVE: return beta; case FTS_EXPIRED: /* Choose the most recently expired prefix. */ if (alpha->hard_lifetime_end_time < beta->hard_lifetime_end_time) return beta; else if ((alpha->hard_lifetime_end_time == beta->hard_lifetime_end_time) && (alpha->soft_lifetime_end_time < beta->soft_lifetime_end_time)) return beta; else return alpha; case FTS_ABANDONED: return alpha; default: log_fatal("Impossible condition at %s:%d.", MDL); } break; case FTS_ABANDONED: switch (beta->state) { case FTS_ACTIVE: case FTS_EXPIRED: return alpha; case FTS_ABANDONED: /* Choose the prefix that was abandoned longest ago. */ if (alpha->hard_lifetime_end_time < beta->hard_lifetime_end_time) return alpha; default: log_fatal("Impossible condition at %s:%d.", MDL); } break; default: log_fatal("Impossible condition at %s:%d.", MDL); } log_fatal("Triple impossible condition at %s:%d.", MDL); return NULL; } /* * Solicit is how a client starts requesting addresses. * * If the client asks for rapid commit, and we support it, we will * allocate the addresses and reply. * * Otherwise we will send an advertise message. */ static void dhcpv6_solicit(struct data_string *reply_ret, struct packet *packet) { struct data_string client_id; /* * Validate our input. */ if (!valid_client_msg(packet, &client_id)) { return; } lease_to_client(reply_ret, packet, &client_id, NULL); /* * Clean up. */ data_string_forget(&client_id, MDL); } /* * Request is how a client actually requests addresses. * * Very similar to Solicit handling, except the server DUID is required. */ /* TODO: reject unicast messages, unless we set unicast option */ static void dhcpv6_request(struct data_string *reply_ret, struct packet *packet) { struct data_string client_id; struct data_string server_id; /* * Validate our input. */ if (!valid_client_resp(packet, &client_id, &server_id)) { return; } /* * Issue our lease. */ lease_to_client(reply_ret, packet, &client_id, &server_id); /* * Cleanup. */ data_string_forget(&client_id, MDL); data_string_forget(&server_id, MDL); } /* Find a DHCPv6 packet's shared network from hints in the packet. */ static isc_result_t shared_network_from_packet6(struct shared_network **shared, struct packet *packet) { const struct packet *chk_packet; const struct in6_addr *link_addr, *first_link_addr; struct iaddr tmp_addr; struct subnet *subnet; isc_result_t status; if ((shared == NULL) || (*shared != NULL) || (packet == NULL)) return DHCP_R_INVALIDARG; /* * First, find the link address where the packet from the client * first appeared (if this packet was relayed). */ first_link_addr = NULL; chk_packet = packet->dhcpv6_container_packet; while (chk_packet != NULL) { link_addr = &chk_packet->dhcpv6_link_address; if (!IN6_IS_ADDR_UNSPECIFIED(link_addr) && !IN6_IS_ADDR_LINKLOCAL(link_addr)) { first_link_addr = link_addr; break; } chk_packet = chk_packet->dhcpv6_container_packet; } /* * If there is a relayed link address, find the subnet associated * with that, and use that to get the appropriate * shared_network. */ if (first_link_addr != NULL) { tmp_addr.len = sizeof(*first_link_addr); memcpy(tmp_addr.iabuf, first_link_addr, sizeof(*first_link_addr)); subnet = NULL; if (!find_subnet(&subnet, tmp_addr, MDL)) { log_debug("No subnet found for link-address %s.", piaddr(tmp_addr)); return ISC_R_NOTFOUND; } status = shared_network_reference(shared, subnet->shared_network, MDL); subnet_dereference(&subnet, MDL); /* * If there is no link address, we will use the interface * that this packet came in on to pick the shared_network. */ } else if (packet->interface != NULL) { status = shared_network_reference(shared, packet->interface->shared_network, MDL); if (packet->dhcpv6_container_packet != NULL) { log_info("[L2 Relay] No link address in relay packet " "assuming L2 relay and using receiving " "interface"); } } else { /* * We shouldn't be able to get here but if there is no link * address and no interface we don't know where to get the * pool from log an error and return an error. */ log_error("No interface and no link address " "can't determine pool"); status = DHCP_R_INVALIDARG; } return status; } /* * When a client thinks it might be on a new link, it sends a * Confirm message. * * From RFC3315 section 18.2.2: * * When the server receives a Confirm message, the server determines * whether the addresses in the Confirm message are appropriate for the * link to which the client is attached. If all of the addresses in the * Confirm message pass this test, the server returns a status of * Success. If any of the addresses do not pass this test, the server * returns a status of NotOnLink. If the server is unable to perform * this test (for example, the server does not have information about * prefixes on the link to which the client is connected), or there were * no addresses in any of the IAs sent by the client, the server MUST * NOT send a reply to the client. */ static void dhcpv6_confirm(struct data_string *reply_ret, struct packet *packet) { struct shared_network *shared; struct subnet *subnet; struct option_cache *ia, *ta, *oc; struct data_string cli_enc_opt_data, iaaddr, client_id, packet_oro; struct option_state *cli_enc_opt_state, *opt_state; struct iaddr cli_addr; int pass; isc_boolean_t inappropriate, has_addrs; char reply_data[65536]; struct dhcpv6_packet *reply = (struct dhcpv6_packet *)reply_data; int reply_ofs = (int)(offsetof(struct dhcpv6_packet, options)); /* * Basic client message validation. */ memset(&client_id, 0, sizeof(client_id)); if (!valid_client_msg(packet, &client_id)) { return; } /* * Do not process Confirms that do not have IA's we do not recognize. */ ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); ta = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_TA); if ((ia == NULL) && (ta == NULL)) return; /* * IA_PD's are simply ignored. */ delete_option(&dhcpv6_universe, packet->options, D6O_IA_PD); /* * Bit of variable initialization. */ opt_state = cli_enc_opt_state = NULL; memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); memset(&iaaddr, 0, sizeof(iaaddr)); memset(&packet_oro, 0, sizeof(packet_oro)); /* Determine what shared network the client is connected to. We * must not respond if we don't have any information about the * network the client is on. */ shared = NULL; if ((shared_network_from_packet6(&shared, packet) != ISC_R_SUCCESS) || (shared == NULL)) goto exit; /* If there are no recorded subnets, then we have no * information about this subnet - ignore Confirms. */ subnet = shared->subnets; if (subnet == NULL) goto exit; /* Are the addresses in all the IA's appropriate for that link? */ has_addrs = inappropriate = ISC_FALSE; pass = D6O_IA_NA; while(!inappropriate) { /* If we've reached the end of the IA_NA pass, move to the * IA_TA pass. */ if ((pass == D6O_IA_NA) && (ia == NULL)) { pass = D6O_IA_TA; ia = ta; } /* If we've reached the end of all passes, we're done. */ if (ia == NULL) break; if (((pass == D6O_IA_NA) && !get_encapsulated_IA_state(&cli_enc_opt_state, &cli_enc_opt_data, packet, ia, IA_NA_OFFSET)) || ((pass == D6O_IA_TA) && !get_encapsulated_IA_state(&cli_enc_opt_state, &cli_enc_opt_data, packet, ia, IA_TA_OFFSET))) { goto exit; } oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, D6O_IAADDR); for ( ; oc != NULL ; oc = oc->next) { if (!evaluate_option_cache(&iaaddr, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL) || (iaaddr.len < IAADDR_OFFSET)) { log_error("dhcpv6_confirm: " "error evaluating IAADDR."); goto exit; } /* Copy out the IPv6 address for processing. */ cli_addr.len = 16; memcpy(cli_addr.iabuf, iaaddr.data, 16); data_string_forget(&iaaddr, MDL); /* Record that we've processed at least one address. */ has_addrs = ISC_TRUE; /* Find out if any subnets cover this address. */ for (subnet = shared->subnets ; subnet != NULL ; subnet = subnet->next_sibling) { if (addr_eq(subnet_number(cli_addr, subnet->netmask), subnet->net)) break; } /* If we reach the end of the subnet list, and no * subnet matches the client address, then it must * be inappropriate to the link (so far as our * configuration says). Once we've found one * inappropriate address, there is no reason to * continue searching. */ if (subnet == NULL) { inappropriate = ISC_TRUE; break; } } option_state_dereference(&cli_enc_opt_state, MDL); data_string_forget(&cli_enc_opt_data, MDL); /* Advance to the next IA_*. */ ia = ia->next; } /* If the client supplied no addresses, do not reply. */ if (!has_addrs) goto exit; /* * Set up reply. */ if (!start_reply(packet, &client_id, NULL, &opt_state, reply)) { goto exit; } /* * Set our status. */ if (inappropriate) { if (!set_status_code(STATUS_NotOnLink, "Some of the addresses are not on link.", opt_state)) { goto exit; } } else { if (!set_status_code(STATUS_Success, "All addresses still on link.", opt_state)) { goto exit; } } /* * Only one option: add it. */ reply_ofs += store_options6(reply_data+reply_ofs, sizeof(reply_data)-reply_ofs, opt_state, packet, required_opts, &packet_oro); /* * Return our reply to the caller. */ reply_ret->len = reply_ofs; reply_ret->buffer = NULL; if (!buffer_allocate(&reply_ret->buffer, reply_ofs, MDL)) { log_fatal("No memory to store reply."); } reply_ret->data = reply_ret->buffer->data; memcpy(reply_ret->buffer->data, reply, reply_ofs); exit: /* Cleanup any stale data strings. */ if (cli_enc_opt_data.buffer != NULL) data_string_forget(&cli_enc_opt_data, MDL); if (iaaddr.buffer != NULL) data_string_forget(&iaaddr, MDL); if (client_id.buffer != NULL) data_string_forget(&client_id, MDL); if (packet_oro.buffer != NULL) data_string_forget(&packet_oro, MDL); /* Release any stale option states. */ if (cli_enc_opt_state != NULL) option_state_dereference(&cli_enc_opt_state, MDL); if (opt_state != NULL) option_state_dereference(&opt_state, MDL); } /* * Renew is when a client wants to extend its lease/prefix, at time T1. * * We handle this the same as if the client wants a new lease/prefix, * except for the error code of when addresses don't match. */ /* TODO: reject unicast messages, unless we set unicast option */ static void dhcpv6_renew(struct data_string *reply, struct packet *packet) { struct data_string client_id; struct data_string server_id; /* * Validate the request. */ if (!valid_client_resp(packet, &client_id, &server_id)) { return; } /* * Renew our lease. */ lease_to_client(reply, packet, &client_id, &server_id); /* * Cleanup. */ data_string_forget(&server_id, MDL); data_string_forget(&client_id, MDL); } /* * Rebind is when a client wants to extend its lease, at time T2. * * We handle this the same as if the client wants a new lease, except * for the error code of when addresses don't match. */ static void dhcpv6_rebind(struct data_string *reply, struct packet *packet) { struct data_string client_id; if (!valid_client_msg(packet, &client_id)) { return; } lease_to_client(reply, packet, &client_id, NULL); data_string_forget(&client_id, MDL); } static void ia_na_match_decline(const struct data_string *client_id, const struct data_string *iaaddr, struct iasubopt *lease) { char tmp_addr[INET6_ADDRSTRLEN]; log_error("Client %s reports address %s is " "already in use by another host!", print_hex_1(client_id->len, client_id->data, 60), inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); if (lease != NULL) { decline_lease6(lease->ipv6_pool, lease); lease->ia->cltt = cur_time; write_ia(lease->ia); } } static void ia_na_nomatch_decline(const struct data_string *client_id, const struct data_string *iaaddr, u_int32_t *ia_na_id, struct packet *packet, char *reply_data, int *reply_ofs, int reply_len) { char tmp_addr[INET6_ADDRSTRLEN]; struct option_state *host_opt_state; int len; log_info("Client %s declines address %s, which is not offered to it.", print_hex_1(client_id->len, client_id->data, 60), inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); /* * Create state for this IA_NA. */ host_opt_state = NULL; if (!option_state_allocate(&host_opt_state, MDL)) { log_error("ia_na_nomatch_decline: out of memory " "allocating option_state."); goto exit; } if (!set_status_code(STATUS_NoBinding, "Decline for unknown address.", host_opt_state)) { goto exit; } /* * Insure we have enough space */ if (reply_len < (*reply_ofs + 16)) { log_error("ia_na_nomatch_decline: " "out of space for reply packet."); goto exit; } /* * Put our status code into the reply packet. */ len = store_options6(reply_data+(*reply_ofs)+16, reply_len-(*reply_ofs)-16, host_opt_state, packet, required_opts_STATUS_CODE, NULL); /* * Store the non-encapsulated option data for this * IA_NA into our reply packet. Defined in RFC 3315, * section 22.4. */ /* option number */ putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_NA); /* option length */ putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); /* IA_NA, copied from the client */ memcpy(reply_data+(*reply_ofs)+4, ia_na_id, 4); /* t1 and t2, odd that we need them, but here it is */ putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); /* * Get ready for next IA_NA. */ *reply_ofs += (len + 16); exit: option_state_dereference(&host_opt_state, MDL); } static void iterate_over_ia_na(struct data_string *reply_ret, struct packet *packet, const struct data_string *client_id, const struct data_string *server_id, const char *packet_type, void (*ia_na_match)(), void (*ia_na_nomatch)()) { struct option_state *opt_state; struct host_decl *packet_host; struct option_cache *ia; struct option_cache *oc; /* cli_enc_... variables come from the IA_NA/IA_TA options */ struct data_string cli_enc_opt_data; struct option_state *cli_enc_opt_state; struct host_decl *host; struct option_state *host_opt_state; struct data_string iaaddr; struct data_string fixed_addr; char reply_data[65536]; struct dhcpv6_packet *reply = (struct dhcpv6_packet *)reply_data; int reply_ofs = (int)(offsetof(struct dhcpv6_packet, options)); char status_msg[32]; struct iasubopt *lease; struct ia_xx *existing_ia_na; int i; struct data_string key; u_int32_t iaid; /* * Initialize to empty values, in case we have to exit early. */ opt_state = NULL; memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); cli_enc_opt_state = NULL; memset(&iaaddr, 0, sizeof(iaaddr)); memset(&fixed_addr, 0, sizeof(fixed_addr)); host_opt_state = NULL; lease = NULL; /* * Find the host record that matches from the packet, if any. */ packet_host = NULL; if (!find_hosts_by_uid(&packet_host, client_id->data, client_id->len, MDL)) { packet_host = NULL; /* * Note: In general, we don't expect a client to provide * enough information to match by option for these * types of messages, but if we don't have a UID * match we can check anyway. */ if (!find_hosts_by_option(&packet_host, packet, packet->options, MDL)) { packet_host = NULL; if (!find_hosts_by_duid_chaddr(&packet_host, client_id)) packet_host = NULL; } } /* * Set our reply information. */ reply->msg_type = DHCPV6_REPLY; memcpy(reply->transaction_id, packet->dhcpv6_transaction_id, sizeof(reply->transaction_id)); /* * Build our option state for reply. */ opt_state = NULL; if (!option_state_allocate(&opt_state, MDL)) { log_error("iterate_over_ia_na: no memory for option_state."); goto exit; } execute_statements_in_scope(NULL, packet, NULL, NULL, packet->options, opt_state, &global_scope, root_group, NULL); /* * RFC 3315, section 18.2.7 tells us which options to include. */ oc = lookup_option(&dhcpv6_universe, opt_state, D6O_SERVERID); if (oc == NULL) { if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, (unsigned char *)server_duid.data, server_duid.len, D6O_SERVERID, 0)) { log_error("iterate_over_ia_na: " "error saving server identifier."); goto exit; } } if (!save_option_buffer(&dhcpv6_universe, opt_state, client_id->buffer, (unsigned char *)client_id->data, client_id->len, D6O_CLIENTID, 0)) { log_error("iterate_over_ia_na: " "error saving client identifier."); goto exit; } snprintf(status_msg, sizeof(status_msg), "%s received.", packet_type); if (!set_status_code(STATUS_Success, status_msg, opt_state)) { goto exit; } /* * Add our options that are not associated with any IA_NA or IA_TA. */ reply_ofs += store_options6(reply_data+reply_ofs, sizeof(reply_data)-reply_ofs, opt_state, packet, required_opts, NULL); /* * Loop through the IA_NA reported by the client, and deal with * addresses reported as already in use. */ for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_NA); ia != NULL; ia = ia->next) { if (!get_encapsulated_IA_state(&cli_enc_opt_state, &cli_enc_opt_data, packet, ia, IA_NA_OFFSET)) { goto exit; } iaid = getULong(cli_enc_opt_data.data); /* * XXX: It is possible that we can get multiple addresses * sent by the client. We don't send multiple * addresses, so this indicates a client error. * We should check for multiple IAADDR options, log * if found, and set as an error. */ oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, D6O_IAADDR); if (oc == NULL) { /* no address given for this IA, ignore */ option_state_dereference(&cli_enc_opt_state, MDL); data_string_forget(&cli_enc_opt_data, MDL); continue; } memset(&iaaddr, 0, sizeof(iaaddr)); if (!evaluate_option_cache(&iaaddr, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("iterate_over_ia_na: " "error evaluating IAADDR."); goto exit; } /* * Now we need to figure out which host record matches * this IA_NA and IAADDR (encapsulated option contents * matching a host record by option). * * XXX: We don't currently track IA_NA separately, but * we will need to do this! */ host = NULL; if (!find_hosts_by_option(&host, packet, cli_enc_opt_state, MDL)) { if (packet_host != NULL) { host = packet_host; } else { host = NULL; } } while (host != NULL) { if (host->fixed_addr != NULL) { if (!evaluate_option_cache(&fixed_addr, NULL, NULL, NULL, NULL, NULL, &global_scope, host->fixed_addr, MDL)) { log_error("iterate_over_ia_na: error " "evaluating host address."); goto exit; } if ((iaaddr.len >= 16) && !memcmp(fixed_addr.data, iaaddr.data, 16)) { data_string_forget(&fixed_addr, MDL); break; } data_string_forget(&fixed_addr, MDL); } host = host->n_ipaddr; } if ((host == NULL) && (iaaddr.len >= IAADDR_OFFSET)) { /* * Find existing IA_NA. */ if (ia_make_key(&key, iaid, (char *)client_id->data, client_id->len, MDL) != ISC_R_SUCCESS) { log_fatal("iterate_over_ia_na: no memory for " "key."); } existing_ia_na = NULL; if (ia_hash_lookup(&existing_ia_na, ia_na_active, (unsigned char *)key.data, key.len, MDL)) { /* * Make sure this address is in the IA_NA. */ for (i=0; inum_iasubopt; i++) { struct iasubopt *tmp; struct in6_addr *in6_addr; tmp = existing_ia_na->iasubopt[i]; in6_addr = &tmp->addr; if (memcmp(in6_addr, iaaddr.data, 16) == 0) { iasubopt_reference(&lease, tmp, MDL); break; } } } data_string_forget(&key, MDL); } if ((host != NULL) || (lease != NULL)) { ia_na_match(client_id, &iaaddr, lease); } else { ia_na_nomatch(client_id, &iaaddr, (u_int32_t *)cli_enc_opt_data.data, packet, reply_data, &reply_ofs, sizeof(reply_data)); } if (lease != NULL) { iasubopt_dereference(&lease, MDL); } data_string_forget(&iaaddr, MDL); option_state_dereference(&cli_enc_opt_state, MDL); data_string_forget(&cli_enc_opt_data, MDL); } /* * Return our reply to the caller. */ reply_ret->len = reply_ofs; reply_ret->buffer = NULL; if (!buffer_allocate(&reply_ret->buffer, reply_ofs, MDL)) { log_fatal("No memory to store reply."); } reply_ret->data = reply_ret->buffer->data; memcpy(reply_ret->buffer->data, reply, reply_ofs); exit: if (lease != NULL) { iasubopt_dereference(&lease, MDL); } if (host_opt_state != NULL) { option_state_dereference(&host_opt_state, MDL); } if (fixed_addr.buffer != NULL) { data_string_forget(&fixed_addr, MDL); } if (iaaddr.buffer != NULL) { data_string_forget(&iaaddr, MDL); } if (cli_enc_opt_state != NULL) { option_state_dereference(&cli_enc_opt_state, MDL); } if (cli_enc_opt_data.buffer != NULL) { data_string_forget(&cli_enc_opt_data, MDL); } if (opt_state != NULL) { option_state_dereference(&opt_state, MDL); } } /* * Decline means a client has detected that something else is using an * address we gave it. * * Since we're only dealing with fixed leases for now, there's not * much we can do, other that log the occurrence. * * When we start issuing addresses from pools, then we will have to * record our declined addresses and issue another. In general with * IPv6 there is no worry about DoS by clients exhausting space, but * we still need to be aware of this possibility. */ /* TODO: reject unicast messages, unless we set unicast option */ /* TODO: IA_TA */ static void dhcpv6_decline(struct data_string *reply, struct packet *packet) { struct data_string client_id; struct data_string server_id; /* * Validate our input. */ if (!valid_client_resp(packet, &client_id, &server_id)) { return; } /* * Undefined for IA_PD. */ delete_option(&dhcpv6_universe, packet->options, D6O_IA_PD); /* * And operate on each IA_NA in this packet. */ iterate_over_ia_na(reply, packet, &client_id, &server_id, "Decline", ia_na_match_decline, ia_na_nomatch_decline); data_string_forget(&server_id, MDL); data_string_forget(&client_id, MDL); } static void ia_na_match_release(const struct data_string *client_id, const struct data_string *iaaddr, struct iasubopt *lease) { char tmp_addr[INET6_ADDRSTRLEN]; log_info("Client %s releases address %s", print_hex_1(client_id->len, client_id->data, 60), inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); if (lease != NULL) { release_lease6(lease->ipv6_pool, lease); lease->ia->cltt = cur_time; write_ia(lease->ia); } } static void ia_na_nomatch_release(const struct data_string *client_id, const struct data_string *iaaddr, u_int32_t *ia_na_id, struct packet *packet, char *reply_data, int *reply_ofs, int reply_len) { char tmp_addr[INET6_ADDRSTRLEN]; struct option_state *host_opt_state; int len; log_info("Client %s releases address %s, which is not leased to it.", print_hex_1(client_id->len, client_id->data, 60), inet_ntop(AF_INET6, iaaddr->data, tmp_addr, sizeof(tmp_addr))); /* * Create state for this IA_NA. */ host_opt_state = NULL; if (!option_state_allocate(&host_opt_state, MDL)) { log_error("ia_na_nomatch_release: out of memory " "allocating option_state."); goto exit; } if (!set_status_code(STATUS_NoBinding, "Release for non-leased address.", host_opt_state)) { goto exit; } /* * Insure we have enough space */ if (reply_len < (*reply_ofs + 16)) { log_error("ia_na_nomatch_release: " "out of space for reply packet."); goto exit; } /* * Put our status code into the reply packet. */ len = store_options6(reply_data+(*reply_ofs)+16, reply_len-(*reply_ofs)-16, host_opt_state, packet, required_opts_STATUS_CODE, NULL); /* * Store the non-encapsulated option data for this * IA_NA into our reply packet. Defined in RFC 3315, * section 22.4. */ /* option number */ putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_NA); /* option length */ putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); /* IA_NA, copied from the client */ memcpy(reply_data+(*reply_ofs)+4, ia_na_id, 4); /* t1 and t2, odd that we need them, but here it is */ putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); /* * Get ready for next IA_NA. */ *reply_ofs += (len + 16); exit: option_state_dereference(&host_opt_state, MDL); } static void ia_pd_match_release(const struct data_string *client_id, const struct data_string *iapref, struct iasubopt *prefix) { char tmp_addr[INET6_ADDRSTRLEN]; log_info("Client %s releases prefix %s/%u", print_hex_1(client_id->len, client_id->data, 60), inet_ntop(AF_INET6, iapref->data + 9, tmp_addr, sizeof(tmp_addr)), (unsigned) getUChar(iapref->data + 8)); if (prefix != NULL) { release_lease6(prefix->ipv6_pool, prefix); prefix->ia->cltt = cur_time; write_ia(prefix->ia); } } static void ia_pd_nomatch_release(const struct data_string *client_id, const struct data_string *iapref, u_int32_t *ia_pd_id, struct packet *packet, char *reply_data, int *reply_ofs, int reply_len) { char tmp_addr[INET6_ADDRSTRLEN]; struct option_state *host_opt_state; int len; log_info("Client %s releases prefix %s/%u, which is not leased to it.", print_hex_1(client_id->len, client_id->data, 60), inet_ntop(AF_INET6, iapref->data + 9, tmp_addr, sizeof(tmp_addr)), (unsigned) getUChar(iapref->data + 8)); /* * Create state for this IA_PD. */ host_opt_state = NULL; if (!option_state_allocate(&host_opt_state, MDL)) { log_error("ia_pd_nomatch_release: out of memory " "allocating option_state."); goto exit; } if (!set_status_code(STATUS_NoBinding, "Release for non-leased prefix.", host_opt_state)) { goto exit; } /* * Insure we have enough space */ if (reply_len < (*reply_ofs + 16)) { log_error("ia_pd_nomatch_release: " "out of space for reply packet."); goto exit; } /* * Put our status code into the reply packet. */ len = store_options6(reply_data+(*reply_ofs)+16, reply_len-(*reply_ofs)-16, host_opt_state, packet, required_opts_STATUS_CODE, NULL); /* * Store the non-encapsulated option data for this * IA_PD into our reply packet. Defined in RFC 3315, * section 22.4. */ /* option number */ putUShort((unsigned char *)reply_data+(*reply_ofs), D6O_IA_PD); /* option length */ putUShort((unsigned char *)reply_data+(*reply_ofs)+2, len + 12); /* IA_PD, copied from the client */ memcpy(reply_data+(*reply_ofs)+4, ia_pd_id, 4); /* t1 and t2, odd that we need them, but here it is */ putULong((unsigned char *)reply_data+(*reply_ofs)+8, 0); putULong((unsigned char *)reply_data+(*reply_ofs)+12, 0); /* * Get ready for next IA_PD. */ *reply_ofs += (len + 16); exit: option_state_dereference(&host_opt_state, MDL); } static void iterate_over_ia_pd(struct data_string *reply_ret, struct packet *packet, const struct data_string *client_id, const struct data_string *server_id, const char *packet_type, void (*ia_pd_match)(), void (*ia_pd_nomatch)()) { struct data_string reply_new; int reply_len; struct option_state *opt_state; struct host_decl *packet_host; struct option_cache *ia; struct option_cache *oc; /* cli_enc_... variables come from the IA_PD options */ struct data_string cli_enc_opt_data; struct option_state *cli_enc_opt_state; struct host_decl *host; struct option_state *host_opt_state; struct data_string iaprefix; char reply_data[65536]; int reply_ofs; struct iasubopt *prefix; struct ia_xx *existing_ia_pd; int i; struct data_string key; u_int32_t iaid; /* * Initialize to empty values, in case we have to exit early. */ memset(&reply_new, 0, sizeof(reply_new)); opt_state = NULL; memset(&cli_enc_opt_data, 0, sizeof(cli_enc_opt_data)); cli_enc_opt_state = NULL; memset(&iaprefix, 0, sizeof(iaprefix)); host_opt_state = NULL; prefix = NULL; /* * Compute the available length for the reply. */ reply_len = sizeof(reply_data) - reply_ret->len; reply_ofs = 0; /* * Find the host record that matches from the packet, if any. */ packet_host = NULL; if (!find_hosts_by_uid(&packet_host, client_id->data, client_id->len, MDL)) { packet_host = NULL; /* * Note: In general, we don't expect a client to provide * enough information to match by option for these * types of messages, but if we don't have a UID * match we can check anyway. */ if (!find_hosts_by_option(&packet_host, packet, packet->options, MDL)) { packet_host = NULL; if (!find_hosts_by_duid_chaddr(&packet_host, client_id)) packet_host = NULL; } } /* * Build our option state for reply. */ opt_state = NULL; if (!option_state_allocate(&opt_state, MDL)) { log_error("iterate_over_ia_pd: no memory for option_state."); goto exit; } execute_statements_in_scope(NULL, packet, NULL, NULL, packet->options, opt_state, &global_scope, root_group, NULL); /* * Loop through the IA_PD reported by the client, and deal with * prefixes reported as already in use. */ for (ia = lookup_option(&dhcpv6_universe, packet->options, D6O_IA_PD); ia != NULL; ia = ia->next) { if (!get_encapsulated_IA_state(&cli_enc_opt_state, &cli_enc_opt_data, packet, ia, IA_PD_OFFSET)) { goto exit; } iaid = getULong(cli_enc_opt_data.data); oc = lookup_option(&dhcpv6_universe, cli_enc_opt_state, D6O_IAPREFIX); if (oc == NULL) { /* no prefix given for this IA_PD, ignore */ option_state_dereference(&cli_enc_opt_state, MDL); data_string_forget(&cli_enc_opt_data, MDL); continue; } for (; oc != NULL; oc = oc->next) { memset(&iaprefix, 0, sizeof(iaprefix)); if (!evaluate_option_cache(&iaprefix, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("iterate_over_ia_pd: " "error evaluating IAPREFIX."); goto exit; } /* * Now we need to figure out which host record matches * this IA_PD and IAPREFIX (encapsulated option contents * matching a host record by option). * * XXX: We don't currently track IA_PD separately, but * we will need to do this! */ host = NULL; if (!find_hosts_by_option(&host, packet, cli_enc_opt_state, MDL)) { if (packet_host != NULL) { host = packet_host; } else { host = NULL; } } while (host != NULL) { if (host->fixed_prefix != NULL) { struct iaddrcidrnetlist *l; int plen = (int) getUChar(iaprefix.data + 8); for (l = host->fixed_prefix; l != NULL; l = l->next) { if (plen != l->cidrnet.bits) continue; if (memcmp(iaprefix.data + 9, l->cidrnet.lo_addr.iabuf, 16) == 0) break; } if ((l != NULL) && (iaprefix.len >= 17)) break; } host = host->n_ipaddr; } if ((host == NULL) && (iaprefix.len >= IAPREFIX_OFFSET)) { /* * Find existing IA_PD. */ if (ia_make_key(&key, iaid, (char *)client_id->data, client_id->len, MDL) != ISC_R_SUCCESS) { log_fatal("iterate_over_ia_pd: no memory for " "key."); } existing_ia_pd = NULL; if (ia_hash_lookup(&existing_ia_pd, ia_pd_active, (unsigned char *)key.data, key.len, MDL)) { /* * Make sure this prefix is in the IA_PD. */ for (i = 0; i < existing_ia_pd->num_iasubopt; i++) { struct iasubopt *tmp; u_int8_t plen; plen = getUChar(iaprefix.data + 8); tmp = existing_ia_pd->iasubopt[i]; if ((tmp->plen == plen) && (memcmp(&tmp->addr, iaprefix.data + 9, 16) == 0)) { iasubopt_reference(&prefix, tmp, MDL); break; } } } data_string_forget(&key, MDL); } if ((host != NULL) || (prefix != NULL)) { ia_pd_match(client_id, &iaprefix, prefix); } else { ia_pd_nomatch(client_id, &iaprefix, (u_int32_t *)cli_enc_opt_data.data, packet, reply_data, &reply_ofs, reply_len - reply_ofs); } if (prefix != NULL) { iasubopt_dereference(&prefix, MDL); } data_string_forget(&iaprefix, MDL); } option_state_dereference(&cli_enc_opt_state, MDL); data_string_forget(&cli_enc_opt_data, MDL); } /* * Return our reply to the caller. * The IA_NA routine has already filled at least the header. */ reply_new.len = reply_ret->len + reply_ofs; if (!buffer_allocate(&reply_new.buffer, reply_new.len, MDL)) { log_fatal("No memory to store reply."); } reply_new.data = reply_new.buffer->data; memcpy(reply_new.buffer->data, reply_ret->buffer->data, reply_ret->len); memcpy(reply_new.buffer->data + reply_ret->len, reply_data, reply_ofs); data_string_forget(reply_ret, MDL); data_string_copy(reply_ret, &reply_new, MDL); data_string_forget(&reply_new, MDL); exit: if (prefix != NULL) { iasubopt_dereference(&prefix, MDL); } if (host_opt_state != NULL) { option_state_dereference(&host_opt_state, MDL); } if (iaprefix.buffer != NULL) { data_string_forget(&iaprefix, MDL); } if (cli_enc_opt_state != NULL) { option_state_dereference(&cli_enc_opt_state, MDL); } if (cli_enc_opt_data.buffer != NULL) { data_string_forget(&cli_enc_opt_data, MDL); } if (opt_state != NULL) { option_state_dereference(&opt_state, MDL); } } /* * Release means a client is done with the leases. */ /* TODO: reject unicast messages, unless we set unicast option */ static void dhcpv6_release(struct data_string *reply, struct packet *packet) { struct data_string client_id; struct data_string server_id; /* * Validate our input. */ if (!valid_client_resp(packet, &client_id, &server_id)) { return; } /* * And operate on each IA_NA in this packet. */ iterate_over_ia_na(reply, packet, &client_id, &server_id, "Release", ia_na_match_release, ia_na_nomatch_release); /* * And operate on each IA_PD in this packet. */ iterate_over_ia_pd(reply, packet, &client_id, &server_id, "Release", ia_pd_match_release, ia_pd_nomatch_release); data_string_forget(&server_id, MDL); data_string_forget(&client_id, MDL); } /* * Information-Request is used by clients who have obtained an address * from other means, but want configuration information from the server. */ static void dhcpv6_information_request(struct data_string *reply, struct packet *packet) { struct data_string client_id; struct data_string server_id; /* * Validate our input. */ if (!valid_client_info_req(packet, &server_id)) { return; } /* * Get our client ID, if there is one. */ memset(&client_id, 0, sizeof(client_id)); if (get_client_id(packet, &client_id) != ISC_R_SUCCESS) { data_string_forget(&client_id, MDL); } /* * Use the lease_to_client() function. This will work fine, * because the valid_client_info_req() insures that we * don't have any IA that would cause us to allocate * resources to the client. */ lease_to_client(reply, packet, &client_id, server_id.data != NULL ? &server_id : NULL); /* * Cleanup. */ if (client_id.data != NULL) { data_string_forget(&client_id, MDL); } data_string_forget(&server_id, MDL); } /* * The Relay-forw message is sent by relays. It typically contains a * single option, which encapsulates an entire packet. * * We need to build an encapsulated reply. */ /* XXX: this is very, very similar to do_packet6(), and should probably be combined in a clever way */ static void dhcpv6_relay_forw(struct data_string *reply_ret, struct packet *packet) { struct option_cache *oc; struct data_string enc_opt_data; struct packet *enc_packet; unsigned char msg_type; const struct dhcpv6_packet *msg; const struct dhcpv6_relay_packet *relay; struct data_string enc_reply; char link_addr[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; char peer_addr[sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")]; struct data_string a_opt, packet_ero; struct option_state *opt_state; static char reply_data[65536]; struct dhcpv6_relay_packet *reply; int reply_ofs; /* * Initialize variables for early exit. */ opt_state = NULL; memset(&a_opt, 0, sizeof(a_opt)); memset(&packet_ero, 0, sizeof(packet_ero)); memset(&enc_reply, 0, sizeof(enc_reply)); memset(&enc_opt_data, 0, sizeof(enc_opt_data)); enc_packet = NULL; /* * Get our encapsulated relay message. */ oc = lookup_option(&dhcpv6_universe, packet->options, D6O_RELAY_MSG); if (oc == NULL) { inet_ntop(AF_INET6, &packet->dhcpv6_link_address, link_addr, sizeof(link_addr)); inet_ntop(AF_INET6, &packet->dhcpv6_peer_address, peer_addr, sizeof(peer_addr)); log_info("Relay-forward from %s with link address=%s and " "peer address=%s missing Relay Message option.", piaddr(packet->client_addr), link_addr, peer_addr); goto exit; } if (!evaluate_option_cache(&enc_opt_data, NULL, NULL, NULL, NULL, NULL, &global_scope, oc, MDL)) { log_error("dhcpv6_forw_relay: error evaluating " "relayed message."); goto exit; } if (!packet6_len_okay((char *)enc_opt_data.data, enc_opt_data.len)) { log_error("dhcpv6_forw_relay: encapsulated packet too short."); goto exit; } /* * Build a packet structure from this encapsulated packet. */ enc_packet = NULL; if (!packet_allocate(&enc_packet, MDL)) { log_error("dhcpv6_forw_relay: " "no memory for encapsulated packet."); goto exit; } if (!option_state_allocate(&enc_packet->options, MDL)) { log_error("dhcpv6_forw_relay: " "no memory for encapsulated packet's options."); goto exit; } enc_packet->client_port = packet->client_port; enc_packet->client_addr = packet->client_addr; interface_reference(&enc_packet->interface, packet->interface, MDL); enc_packet->dhcpv6_container_packet = packet; msg_type = enc_opt_data.data[0]; if ((msg_type == DHCPV6_RELAY_FORW) || (msg_type == DHCPV6_RELAY_REPL)) { int relaylen = (int)(offsetof(struct dhcpv6_relay_packet, options)); relay = (struct dhcpv6_relay_packet *)enc_opt_data.data; enc_packet->dhcpv6_msg_type = relay->msg_type; /* relay-specific data */ enc_packet->dhcpv6_hop_count = relay->hop_count; memcpy(&enc_packet->dhcpv6_link_address, relay->link_address, sizeof(relay->link_address)); memcpy(&enc_packet->dhcpv6_peer_address, relay->peer_address, sizeof(relay->peer_address)); if (!parse_option_buffer(enc_packet->options, relay->options, enc_opt_data.len - relaylen, &dhcpv6_universe)) { /* no logging here, as parse_option_buffer() logs all cases where it fails */ goto exit; } } else { int msglen = (int)(offsetof(struct dhcpv6_packet, options)); msg = (struct dhcpv6_packet *)enc_opt_data.data; enc_packet->dhcpv6_msg_type = msg->msg_type; /* message-specific data */ memcpy(enc_packet->dhcpv6_transaction_id, msg->transaction_id, sizeof(enc_packet->dhcpv6_transaction_id)); if (!parse_option_buffer(enc_packet->options, msg->options, enc_opt_data.len - msglen, &dhcpv6_universe)) { /* no logging here, as parse_option_buffer() logs all cases where it fails */ goto exit; } } /* * This is recursive. It is possible to exceed maximum packet size. * XXX: This will cause the packet send to fail. */ build_dhcpv6_reply(&enc_reply, enc_packet); /* * If we got no encapsulated data, then it is discarded, and * our reply-forw is also discarded. */ if (enc_reply.data == NULL) { goto exit; } /* * Now we can use the reply_data buffer. * Packet header stuff all comes from the forward message. */ reply = (struct dhcpv6_relay_packet *)reply_data; reply->msg_type = DHCPV6_RELAY_REPL; reply->hop_count = packet->dhcpv6_hop_count; memcpy(reply->link_address, &packet->dhcpv6_link_address, sizeof(reply->link_address)); memcpy(reply->peer_address, &packet->dhcpv6_peer_address, sizeof(reply->peer_address)); reply_ofs = (int)(offsetof(struct dhcpv6_relay_packet, options)); /* * Get the reply option state. */ opt_state = NULL; if (!option_state_allocate(&opt_state, MDL)) { log_error("dhcpv6_relay_forw: no memory for option state."); goto exit; } /* * Append the interface-id if present. */ oc = lookup_option(&dhcpv6_universe, packet->options, D6O_INTERFACE_ID); if (oc != NULL) { if (!evaluate_option_cache(&a_opt, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("dhcpv6_relay_forw: error evaluating " "Interface ID."); goto exit; } if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, (unsigned char *)a_opt.data, a_opt.len, D6O_INTERFACE_ID, 0)) { log_error("dhcpv6_relay_forw: error saving " "Interface ID."); goto exit; } data_string_forget(&a_opt, MDL); } /* * Append our encapsulated stuff for caller. */ if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, (unsigned char *)enc_reply.data, enc_reply.len, D6O_RELAY_MSG, 0)) { log_error("dhcpv6_relay_forw: error saving Relay MSG."); goto exit; } /* * Get the ERO if any. */ oc = lookup_option(&dhcpv6_universe, packet->options, D6O_ERO); if (oc != NULL) { unsigned req; int i; if (!evaluate_option_cache(&packet_ero, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL) || (packet_ero.len & 1)) { log_error("dhcpv6_relay_forw: error evaluating ERO."); goto exit; } /* Decode and apply the ERO. */ for (i = 0; i < packet_ero.len; i += 2) { req = getUShort(packet_ero.data + i); /* Already in the reply? */ oc = lookup_option(&dhcpv6_universe, opt_state, req); if (oc != NULL) continue; /* Get it from the packet if present. */ oc = lookup_option(&dhcpv6_universe, packet->options, req); if (oc == NULL) continue; if (!evaluate_option_cache(&a_opt, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("dhcpv6_relay_forw: error " "evaluating option %u.", req); goto exit; } if (!save_option_buffer(&dhcpv6_universe, opt_state, NULL, (unsigned char *)a_opt.data, a_opt.len, req, 0)) { log_error("dhcpv6_relay_forw: error saving " "option %u.", req); goto exit; } data_string_forget(&a_opt, MDL); } } reply_ofs += store_options6(reply_data + reply_ofs, sizeof(reply_data) - reply_ofs, opt_state, packet, required_opts_agent, &packet_ero); /* * Return our reply to the caller. */ reply_ret->len = reply_ofs; reply_ret->buffer = NULL; if (!buffer_allocate(&reply_ret->buffer, reply_ret->len, MDL)) { log_fatal("No memory to store reply."); } reply_ret->data = reply_ret->buffer->data; memcpy(reply_ret->buffer->data, reply_data, reply_ofs); exit: if (opt_state != NULL) option_state_dereference(&opt_state, MDL); if (a_opt.data != NULL) { data_string_forget(&a_opt, MDL); } if (packet_ero.data != NULL) { data_string_forget(&packet_ero, MDL); } if (enc_reply.data != NULL) { data_string_forget(&enc_reply, MDL); } if (enc_opt_data.data != NULL) { data_string_forget(&enc_opt_data, MDL); } if (enc_packet != NULL) { packet_dereference(&enc_packet, MDL); } } static void dhcpv6_discard(struct packet *packet) { /* INSIST(packet->msg_type > 0); */ /* INSIST(packet->msg_type < dhcpv6_type_name_max); */ log_debug("Discarding %s from %s; message type not handled by server", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr)); } static void build_dhcpv6_reply(struct data_string *reply, struct packet *packet) { memset(reply, 0, sizeof(*reply)); switch (packet->dhcpv6_msg_type) { case DHCPV6_SOLICIT: dhcpv6_solicit(reply, packet); break; case DHCPV6_ADVERTISE: dhcpv6_discard(packet); break; case DHCPV6_REQUEST: dhcpv6_request(reply, packet); break; case DHCPV6_CONFIRM: dhcpv6_confirm(reply, packet); break; case DHCPV6_RENEW: dhcpv6_renew(reply, packet); break; case DHCPV6_REBIND: dhcpv6_rebind(reply, packet); break; case DHCPV6_REPLY: dhcpv6_discard(packet); break; case DHCPV6_RELEASE: dhcpv6_release(reply, packet); break; case DHCPV6_DECLINE: dhcpv6_decline(reply, packet); break; case DHCPV6_RECONFIGURE: dhcpv6_discard(packet); break; case DHCPV6_INFORMATION_REQUEST: dhcpv6_information_request(reply, packet); break; case DHCPV6_RELAY_FORW: dhcpv6_relay_forw(reply, packet); break; case DHCPV6_RELAY_REPL: dhcpv6_discard(packet); break; case DHCPV6_LEASEQUERY: dhcpv6_leasequery(reply, packet); break; case DHCPV6_LEASEQUERY_REPLY: dhcpv6_discard(packet); break; default: /* XXX: would be nice if we had "notice" level, as syslog, for this */ log_info("Discarding unknown DHCPv6 message type %d " "from %s", packet->dhcpv6_msg_type, piaddr(packet->client_addr)); } } static void log_packet_in(const struct packet *packet) { struct data_string s; u_int32_t tid; char tmp_addr[INET6_ADDRSTRLEN]; const void *addr; memset(&s, 0, sizeof(s)); if (packet->dhcpv6_msg_type < dhcpv6_type_name_max) { data_string_sprintfa(&s, "%s message from %s port %d", dhcpv6_type_names[packet->dhcpv6_msg_type], piaddr(packet->client_addr), ntohs(packet->client_port)); } else { data_string_sprintfa(&s, "Unknown message type %d from %s port %d", packet->dhcpv6_msg_type, piaddr(packet->client_addr), ntohs(packet->client_port)); } if ((packet->dhcpv6_msg_type == DHCPV6_RELAY_FORW) || (packet->dhcpv6_msg_type == DHCPV6_RELAY_REPL)) { addr = &packet->dhcpv6_link_address; data_string_sprintfa(&s, ", link address %s", inet_ntop(AF_INET6, addr, tmp_addr, sizeof(tmp_addr))); addr = &packet->dhcpv6_peer_address; data_string_sprintfa(&s, ", peer address %s", inet_ntop(AF_INET6, addr, tmp_addr, sizeof(tmp_addr))); } else { tid = 0; memcpy(((char *)&tid)+1, packet->dhcpv6_transaction_id, 3); data_string_sprintfa(&s, ", transaction ID 0x%06X", tid); /* oc = lookup_option(&dhcpv6_universe, packet->options, D6O_CLIENTID); if (oc != NULL) { memset(&tmp_ds, 0, sizeof(tmp_ds_)); if (!evaluate_option_cache(&tmp_ds, packet, NULL, NULL, packet->options, NULL, &global_scope, oc, MDL)) { log_error("Error evaluating Client Identifier"); } else { data_strint_sprintf(&s, ", client ID %s", data_string_forget(&tmp_ds, MDL); } } */ } log_info("%s", s.data); data_string_forget(&s, MDL); } void dhcpv6(struct packet *packet) { struct data_string reply; struct sockaddr_in6 to_addr; int send_ret; /* * Log a message that we received this packet. */ log_packet_in(packet); /* * Build our reply packet. */ build_dhcpv6_reply(&reply, packet); if (reply.data != NULL) { /* * Send our reply, if we have one. */ memset(&to_addr, 0, sizeof(to_addr)); to_addr.sin6_family = AF_INET6; if ((packet->dhcpv6_msg_type == DHCPV6_RELAY_FORW) || (packet->dhcpv6_msg_type == DHCPV6_RELAY_REPL)) { to_addr.sin6_port = local_port; } else { to_addr.sin6_port = remote_port; } #if defined (REPLY_TO_SOURCE_PORT) /* * This appears to have been included for testing so we would * not need a root client, but was accidently left in the * final code. We continue to include it in case * some users have come to rely upon it, but leave * it off by default as it's a bad idea. */ to_addr.sin6_port = packet->client_port; #endif memcpy(&to_addr.sin6_addr, packet->client_addr.iabuf, sizeof(to_addr.sin6_addr)); log_info("Sending %s to %s port %d", dhcpv6_type_names[reply.data[0]], piaddr(packet->client_addr), ntohs(to_addr.sin6_port)); send_ret = send_packet6(packet->interface, reply.data, reply.len, &to_addr); if (send_ret != reply.len) { log_error("dhcpv6: send_packet6() sent %d of %d bytes", send_ret, reply.len); } data_string_forget(&reply, MDL); } } static void seek_shared_host(struct host_decl **hp, struct shared_network *shared) { struct host_decl *nofixed = NULL; struct host_decl *seek, *hold = NULL; /* * Seek forward through fixed addresses for the right link. * * Note: how to do this for fixed prefixes??? */ host_reference(&hold, *hp, MDL); host_dereference(hp, MDL); seek = hold; while (seek != NULL) { if (seek->fixed_addr == NULL) nofixed = seek; else if (fixed_matches_shared(seek, shared)) break; seek = seek->n_ipaddr; } if ((seek == NULL) && (nofixed != NULL)) seek = nofixed; if (seek != NULL) host_reference(hp, seek, MDL); } static isc_boolean_t fixed_matches_shared(struct host_decl *host, struct shared_network *shared) { struct subnet *subnet; struct data_string addr; isc_boolean_t matched; struct iaddr fixed; if (host->fixed_addr == NULL) return ISC_FALSE; memset(&addr, 0, sizeof(addr)); if (!evaluate_option_cache(&addr, NULL, NULL, NULL, NULL, NULL, &global_scope, host->fixed_addr, MDL)) return ISC_FALSE; if (addr.len < 16) { data_string_forget(&addr, MDL); return ISC_FALSE; } fixed.len = 16; memcpy(fixed.iabuf, addr.data, 16); matched = ISC_FALSE; for (subnet = shared->subnets ; subnet != NULL ; subnet = subnet->next_sibling) { if (addr_eq(subnet_number(fixed, subnet->netmask), subnet->net)) { matched = ISC_TRUE; break; } } data_string_forget(&addr, MDL); return matched; } /* * find_host_by_duid_chaddr() synthesizes a DHCPv4-like 'hardware' * parameter from a DHCPv6 supplied DUID (client-identifier option), * and may seek to use client or relay supplied hardware addresses. */ static int find_hosts_by_duid_chaddr(struct host_decl **host, const struct data_string *client_id) { static int once_htype; int htype, hlen; const unsigned char *chaddr; /* * The DUID-LL and DUID-LLT must have a 2-byte DUID type and 2-byte * htype. */ if (client_id->len < 4) return 0; /* * The third and fourth octets of the DUID-LL and DUID-LLT * is the hardware type, but in 16 bits. */ htype = getUShort(client_id->data + 2); hlen = 0; chaddr = NULL; /* The first two octets of the DUID identify the type. */ switch(getUShort(client_id->data)) { case DUID_LLT: if (client_id->len > 8) { hlen = client_id->len - 8; chaddr = client_id->data + 8; } break; case DUID_LL: /* * Note that client_id->len must be greater than or equal * to four to get to this point in the function. */ hlen = client_id->len - 4; chaddr = client_id->data + 4; break; default: break; } if (hlen == 0) return 0; /* * XXX: DHCPv6 gives a 16-bit field for the htype. DHCPv4 gives an * 8-bit field. To change the semantics of the generic 'hardware' * structure, we would have to adjust many DHCPv4 sources (from * interface to DHCPv4 lease code), and we would have to update the * 'hardware' config directive (probably being reverse compatible and * providing a new upgrade/replacement primitive). This is a little * too much to change for now. Hopefully we will revisit this before * hardware types exceeding 8 bits are assigned. */ if ((htype & 0xFF00) && !once_htype) { once_htype = 1; log_error("Attention: At least one client advertises a " "hardware type of %d, which exceeds the software " "limitation of 255.", htype); } return find_hosts_by_haddr(host, htype, chaddr, hlen, MDL); } #endif /* DHCPv6 */