/* SPDX-License-Identifier: LGPL-2.1-or-later */ /*** Copyright © 2014-2015 Intel Corporation. All rights reserved. ***/ #include #include "alloc-util.h" #include "dhcp6-internal.h" #include "dhcp6-lease-internal.h" #include "strv.h" #define IRT_DEFAULT (1 * USEC_PER_DAY) #define IRT_MINIMUM (600 * USEC_PER_SEC) static void dhcp6_lease_set_timestamp(sd_dhcp6_lease *lease, const triple_timestamp *timestamp) { assert(lease); if (timestamp && triple_timestamp_is_set(timestamp)) lease->timestamp = *timestamp; else triple_timestamp_get(&lease->timestamp); } int sd_dhcp6_lease_get_timestamp(sd_dhcp6_lease *lease, clockid_t clock, uint64_t *ret) { assert_return(lease, -EINVAL); assert_return(TRIPLE_TIMESTAMP_HAS_CLOCK(clock), -EOPNOTSUPP); assert_return(clock_supported(clock), -EOPNOTSUPP); assert_return(ret, -EINVAL); if (!triple_timestamp_is_set(&lease->timestamp)) return -ENODATA; *ret = triple_timestamp_by_clock(&lease->timestamp, clock); return 0; } static usec_t sec2usec(uint32_t sec) { return sec == UINT32_MAX ? USEC_INFINITY : sec * USEC_PER_SEC; } static void dhcp6_lease_set_lifetime(sd_dhcp6_lease *lease) { uint32_t t1 = UINT32_MAX, t2 = UINT32_MAX, min_valid_lt = UINT32_MAX; assert(lease); assert(lease->ia_na || lease->ia_pd); if (lease->ia_na) { t1 = MIN(t1, be32toh(lease->ia_na->header.lifetime_t1)); t2 = MIN(t2, be32toh(lease->ia_na->header.lifetime_t2)); LIST_FOREACH(addresses, a, lease->ia_na->addresses) min_valid_lt = MIN(min_valid_lt, be32toh(a->iaaddr.lifetime_valid)); } if (lease->ia_pd) { t1 = MIN(t1, be32toh(lease->ia_pd->header.lifetime_t1)); t2 = MIN(t2, be32toh(lease->ia_pd->header.lifetime_t2)); LIST_FOREACH(addresses, a, lease->ia_pd->addresses) min_valid_lt = MIN(min_valid_lt, be32toh(a->iapdprefix.lifetime_valid)); } if (t2 == 0 || t2 > min_valid_lt) { /* If T2 is zero or longer than the minimum valid lifetime of the addresses or prefixes, * then adjust lifetime with it. */ t1 = min_valid_lt / 2; t2 = min_valid_lt / 10 * 8; } lease->lifetime_valid = sec2usec(min_valid_lt); lease->lifetime_t1 = sec2usec(t1); lease->lifetime_t2 = sec2usec(t2); } int dhcp6_lease_get_lifetime(sd_dhcp6_lease *lease, usec_t *ret_t1, usec_t *ret_t2, usec_t *ret_valid) { assert(lease); if (!lease->ia_na && !lease->ia_pd) return -ENODATA; if (ret_t1) *ret_t1 = lease->lifetime_t1; if (ret_t2) *ret_t2 = lease->lifetime_t2; if (ret_valid) *ret_valid = lease->lifetime_valid; return 0; } static void dhcp6_lease_set_server_address(sd_dhcp6_lease *lease, const struct in6_addr *server_address) { assert(lease); if (server_address) lease->server_address = *server_address; else lease->server_address = (struct in6_addr) {}; } int sd_dhcp6_lease_get_server_address(sd_dhcp6_lease *lease, struct in6_addr *ret) { assert_return(lease, -EINVAL); assert_return(ret, -EINVAL); *ret = lease->server_address; return 0; } void dhcp6_ia_clear_addresses(DHCP6IA *ia) { assert(ia); LIST_FOREACH(addresses, a, ia->addresses) free(a); ia->addresses = NULL; } DHCP6IA *dhcp6_ia_free(DHCP6IA *ia) { if (!ia) return NULL; dhcp6_ia_clear_addresses(ia); return mfree(ia); } int dhcp6_lease_set_clientid(sd_dhcp6_lease *lease, const uint8_t *id, size_t len) { uint8_t *clientid = NULL; assert(lease); assert(id || len == 0); if (len > 0) { clientid = memdup(id, len); if (!clientid) return -ENOMEM; } free_and_replace(lease->clientid, clientid); lease->clientid_len = len; return 0; } int dhcp6_lease_get_clientid(sd_dhcp6_lease *lease, uint8_t **ret_id, size_t *ret_len) { assert(lease); if (!lease->clientid) return -ENODATA; if (ret_id) *ret_id = lease->clientid; if (ret_len) *ret_len = lease->clientid_len; return 0; } int dhcp6_lease_set_serverid(sd_dhcp6_lease *lease, const uint8_t *id, size_t len) { uint8_t *serverid = NULL; assert(lease); assert(id || len == 0); if (len > 0) { serverid = memdup(id, len); if (!serverid) return -ENOMEM; } free_and_replace(lease->serverid, serverid); lease->serverid_len = len; return 0; } int dhcp6_lease_get_serverid(sd_dhcp6_lease *lease, uint8_t **ret_id, size_t *ret_len) { assert(lease); if (!lease->serverid) return -ENODATA; if (ret_id) *ret_id = lease->serverid; if (ret_len) *ret_len = lease->serverid_len; return 0; } int dhcp6_lease_set_preference(sd_dhcp6_lease *lease, uint8_t preference) { assert(lease); lease->preference = preference; return 0; } int dhcp6_lease_get_preference(sd_dhcp6_lease *lease, uint8_t *ret) { assert(lease); assert(ret); *ret = lease->preference; return 0; } int dhcp6_lease_set_rapid_commit(sd_dhcp6_lease *lease) { assert(lease); lease->rapid_commit = true; return 0; } int dhcp6_lease_get_rapid_commit(sd_dhcp6_lease *lease, bool *ret) { assert(lease); assert(ret); *ret = lease->rapid_commit; return 0; } int sd_dhcp6_lease_get_address( sd_dhcp6_lease *lease, struct in6_addr *ret_addr, uint32_t *ret_lifetime_preferred, uint32_t *ret_lifetime_valid) { assert_return(lease, -EINVAL); if (!lease->addr_iter) return -ENODATA; if (ret_addr) *ret_addr = lease->addr_iter->iaaddr.address; if (ret_lifetime_preferred) *ret_lifetime_preferred = be32toh(lease->addr_iter->iaaddr.lifetime_preferred); if (ret_lifetime_valid) *ret_lifetime_valid = be32toh(lease->addr_iter->iaaddr.lifetime_valid); lease->addr_iter = lease->addr_iter->addresses_next; return 0; } void sd_dhcp6_lease_reset_address_iter(sd_dhcp6_lease *lease) { if (lease) lease->addr_iter = lease->ia_na ? lease->ia_na->addresses : NULL; } int sd_dhcp6_lease_get_pd( sd_dhcp6_lease *lease, struct in6_addr *ret_prefix, uint8_t *ret_prefix_len, uint32_t *ret_lifetime_preferred, uint32_t *ret_lifetime_valid) { assert_return(lease, -EINVAL); if (!lease->prefix_iter) return -ENODATA; if (ret_prefix) *ret_prefix = lease->prefix_iter->iapdprefix.address; if (ret_prefix_len) *ret_prefix_len = lease->prefix_iter->iapdprefix.prefixlen; if (ret_lifetime_preferred) *ret_lifetime_preferred = be32toh(lease->prefix_iter->iapdprefix.lifetime_preferred); if (ret_lifetime_valid) *ret_lifetime_valid = be32toh(lease->prefix_iter->iapdprefix.lifetime_valid); lease->prefix_iter = lease->prefix_iter->addresses_next; return 0; } void sd_dhcp6_lease_reset_pd_prefix_iter(sd_dhcp6_lease *lease) { if (lease) lease->prefix_iter = lease->ia_pd ? lease->ia_pd->addresses : NULL; } int dhcp6_lease_add_dns(sd_dhcp6_lease *lease, const uint8_t *optval, size_t optlen) { assert(lease); assert(optval || optlen == 0); if (optlen == 0) return 0; return dhcp6_option_parse_addresses(optval, optlen, &lease->dns, &lease->dns_count); } int sd_dhcp6_lease_get_dns(sd_dhcp6_lease *lease, const struct in6_addr **ret) { assert_return(lease, -EINVAL); if (!lease->dns) return -ENODATA; if (ret) *ret = lease->dns; return lease->dns_count; } int dhcp6_lease_add_domains(sd_dhcp6_lease *lease, const uint8_t *optval, size_t optlen) { _cleanup_strv_free_ char **domains = NULL; int r; assert(lease); assert(optval || optlen == 0); if (optlen == 0) return 0; r = dhcp6_option_parse_domainname_list(optval, optlen, &domains); if (r < 0) return r; return strv_extend_strv(&lease->domains, domains, true); } int sd_dhcp6_lease_get_domains(sd_dhcp6_lease *lease, char ***ret) { assert_return(lease, -EINVAL); assert_return(ret, -EINVAL); if (!lease->domains) return -ENODATA; *ret = lease->domains; return strv_length(lease->domains); } int dhcp6_lease_add_ntp(sd_dhcp6_lease *lease, const uint8_t *optval, size_t optlen) { int r; assert(lease); assert(optval || optlen == 0); for (size_t offset = 0; offset < optlen;) { const uint8_t *subval; size_t sublen; uint16_t subopt; r = dhcp6_option_parse(optval, optlen, &offset, &subopt, &sublen, &subval); if (r < 0) return r; switch (subopt) { case DHCP6_NTP_SUBOPTION_SRV_ADDR: case DHCP6_NTP_SUBOPTION_MC_ADDR: if (sublen != 16) return -EINVAL; r = dhcp6_option_parse_addresses(subval, sublen, &lease->ntp, &lease->ntp_count); if (r < 0) return r; break; case DHCP6_NTP_SUBOPTION_SRV_FQDN: { _cleanup_free_ char *server = NULL; r = dhcp6_option_parse_domainname(subval, sublen, &server); if (r < 0) return r; if (strv_contains(lease->ntp_fqdn, server)) continue; r = strv_consume(&lease->ntp_fqdn, TAKE_PTR(server)); if (r < 0) return r; break; }} } return 0; } int dhcp6_lease_add_sntp(sd_dhcp6_lease *lease, const uint8_t *optval, size_t optlen) { assert(lease); assert(optval || optlen == 0); if (optlen == 0) return 0; /* SNTP option is defined in RFC4075, and deprecated by RFC5908. */ return dhcp6_option_parse_addresses(optval, optlen, &lease->sntp, &lease->sntp_count); } int sd_dhcp6_lease_get_ntp_addrs(sd_dhcp6_lease *lease, const struct in6_addr **ret) { assert_return(lease, -EINVAL); if (lease->ntp) { if (ret) *ret = lease->ntp; return lease->ntp_count; } if (lease->sntp && !lease->ntp_fqdn) { /* Fallback to the deprecated SNTP option. */ if (ret) *ret = lease->sntp; return lease->sntp_count; } return -ENODATA; } int sd_dhcp6_lease_get_ntp_fqdn(sd_dhcp6_lease *lease, char ***ret) { assert_return(lease, -EINVAL); if (!lease->ntp_fqdn) return -ENODATA; if (ret) *ret = lease->ntp_fqdn; return strv_length(lease->ntp_fqdn); } int dhcp6_lease_set_fqdn(sd_dhcp6_lease *lease, const uint8_t *optval, size_t optlen) { char *fqdn; int r; assert(lease); assert(optval || optlen == 0); if (optlen == 0) return 0; if (optlen < 2) return -ENODATA; /* Ignore the flags field, it doesn't carry any useful information for clients. */ r = dhcp6_option_parse_domainname(optval + 1, optlen - 1, &fqdn); if (r < 0) return r; return free_and_replace(lease->fqdn, fqdn); } int sd_dhcp6_lease_get_fqdn(sd_dhcp6_lease *lease, const char **ret) { assert_return(lease, -EINVAL); assert_return(ret, -EINVAL); if (!lease->fqdn) return -ENODATA; *ret = lease->fqdn; return 0; } static int dhcp6_lease_parse_message( sd_dhcp6_client *client, sd_dhcp6_lease *lease, const DHCP6Message *message, size_t len) { usec_t irt = IRT_DEFAULT; int r; assert(client); assert(lease); assert(message); assert(len >= sizeof(DHCP6Message)); len -= sizeof(DHCP6Message); for (size_t offset = 0; offset < len;) { uint16_t optcode; size_t optlen; const uint8_t *optval; r = dhcp6_option_parse(message->options, len, &offset, &optcode, &optlen, &optval); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to parse option header at offset %zu of total length %zu: %m", offset, len); switch (optcode) { case SD_DHCP6_OPTION_CLIENTID: if (dhcp6_lease_get_clientid(lease, NULL, NULL) >= 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "%s contains multiple client IDs", dhcp6_message_type_to_string(message->type)); r = dhcp6_lease_set_clientid(lease, optval, optlen); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set client ID: %m"); break; case SD_DHCP6_OPTION_SERVERID: if (dhcp6_lease_get_serverid(lease, NULL, NULL) >= 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "%s contains multiple server IDs", dhcp6_message_type_to_string(message->type)); r = dhcp6_lease_set_serverid(lease, optval, optlen); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set server ID: %m"); break; case SD_DHCP6_OPTION_PREFERENCE: if (optlen != 1) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received invalid length for preference."); r = dhcp6_lease_set_preference(lease, optval[0]); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set preference: %m"); break; case SD_DHCP6_OPTION_STATUS_CODE: { _cleanup_free_ char *msg = NULL; r = dhcp6_option_parse_status(optval, optlen, &msg); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to parse status code: %m"); if (r > 0) return log_dhcp6_client_errno(client, dhcp6_message_status_to_errno(r), "Received %s message with non-zero status: %s%s%s", dhcp6_message_type_to_string(message->type), strempty(msg), isempty(msg) ? "" : ": ", dhcp6_message_status_to_string(r)); break; } case SD_DHCP6_OPTION_IA_NA: { _cleanup_(dhcp6_ia_freep) DHCP6IA *ia = NULL; if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { log_dhcp6_client(client, "Ignoring IA NA option in information requesting mode."); break; } r = dhcp6_option_parse_ia(client, client->ia_na.header.id, optcode, optlen, optval, &ia); if (r == -ENOMEM) return log_oom_debug(); if (r < 0) { log_dhcp6_client_errno(client, r, "Failed to parse IA_NA option, ignoring: %m"); continue; } if (lease->ia_na) { log_dhcp6_client(client, "Received duplicate matching IA_NA option, ignoring."); continue; } dhcp6_ia_free(lease->ia_na); lease->ia_na = TAKE_PTR(ia); break; } case SD_DHCP6_OPTION_IA_PD: { _cleanup_(dhcp6_ia_freep) DHCP6IA *ia = NULL; if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { log_dhcp6_client(client, "Ignoring IA PD option in information requesting mode."); break; } r = dhcp6_option_parse_ia(client, client->ia_pd.header.id, optcode, optlen, optval, &ia); if (r == -ENOMEM) return log_oom_debug(); if (r < 0) { log_dhcp6_client_errno(client, r, "Failed to parse IA_PD option, ignoring: %m"); continue; } if (lease->ia_pd) { log_dhcp6_client(client, "Received duplicate matching IA_PD option, ignoring."); continue; } dhcp6_ia_free(lease->ia_pd); lease->ia_pd = TAKE_PTR(ia); break; } case SD_DHCP6_OPTION_RAPID_COMMIT: if (optlen != 0) log_dhcp6_client(client, "Received rapid commit option with an invalid length (%zu), ignoring.", optlen); r = dhcp6_lease_set_rapid_commit(lease); if (r < 0) return log_dhcp6_client_errno(client, r, "Failed to set rapid commit flag: %m"); break; case SD_DHCP6_OPTION_DNS_SERVER: r = dhcp6_lease_add_dns(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse DNS server option, ignoring: %m"); break; case SD_DHCP6_OPTION_DOMAIN: r = dhcp6_lease_add_domains(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse domain list option, ignoring: %m"); break; case SD_DHCP6_OPTION_NTP_SERVER: r = dhcp6_lease_add_ntp(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse NTP server option, ignoring: %m"); break; case SD_DHCP6_OPTION_SNTP_SERVER: r = dhcp6_lease_add_sntp(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse SNTP server option, ignoring: %m"); break; case SD_DHCP6_OPTION_CLIENT_FQDN: r = dhcp6_lease_set_fqdn(lease, optval, optlen); if (r < 0) log_dhcp6_client_errno(client, r, "Failed to parse FQDN option, ignoring: %m"); break; case SD_DHCP6_OPTION_INFORMATION_REFRESH_TIME: if (optlen != 4) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received information refresh time option with an invalid length (%zu).", optlen); irt = unaligned_read_be32(optval) * USEC_PER_SEC; break; } } uint8_t *clientid; size_t clientid_len; if (dhcp6_lease_get_clientid(lease, &clientid, &clientid_len) < 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "%s message does not contain client ID. Ignoring.", dhcp6_message_type_to_string(message->type)); if (memcmp_nn(clientid, clientid_len, &client->duid, client->duid_len) != 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "The client ID in %s message does not match. Ignoring.", dhcp6_message_type_to_string(message->type)); if (client->state == DHCP6_STATE_INFORMATION_REQUEST) { client->information_refresh_time_usec = MAX(irt, IRT_MINIMUM); log_dhcp6_client(client, "New information request will be refused in %s.", FORMAT_TIMESPAN(client->information_refresh_time_usec, USEC_PER_SEC)); } else { r = dhcp6_lease_get_serverid(lease, NULL, NULL); if (r < 0) return log_dhcp6_client_errno(client, r, "%s has no server id", dhcp6_message_type_to_string(message->type)); if (!lease->ia_na && !lease->ia_pd) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "No IA_PD prefix or IA_NA address received. Ignoring."); dhcp6_lease_set_lifetime(lease); } return 0; } static sd_dhcp6_lease *dhcp6_lease_free(sd_dhcp6_lease *lease) { if (!lease) return NULL; free(lease->clientid); free(lease->serverid); dhcp6_ia_free(lease->ia_na); dhcp6_ia_free(lease->ia_pd); free(lease->dns); free(lease->fqdn); strv_free(lease->domains); free(lease->ntp); strv_free(lease->ntp_fqdn); free(lease->sntp); return mfree(lease); } DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp6_lease, sd_dhcp6_lease, dhcp6_lease_free); int dhcp6_lease_new(sd_dhcp6_lease **ret) { sd_dhcp6_lease *lease; assert(ret); lease = new(sd_dhcp6_lease, 1); if (!lease) return -ENOMEM; *lease = (sd_dhcp6_lease) { .n_ref = 1, }; *ret = lease; return 0; } int dhcp6_lease_new_from_message( sd_dhcp6_client *client, const DHCP6Message *message, size_t len, const triple_timestamp *timestamp, const struct in6_addr *server_address, sd_dhcp6_lease **ret) { _cleanup_(sd_dhcp6_lease_unrefp) sd_dhcp6_lease *lease = NULL; int r; assert(client); assert(message); assert(len >= sizeof(DHCP6Message)); assert(ret); r = dhcp6_lease_new(&lease); if (r < 0) return r; dhcp6_lease_set_timestamp(lease, timestamp); dhcp6_lease_set_server_address(lease, server_address); r = dhcp6_lease_parse_message(client, lease, message, len); if (r < 0) return r; *ret = TAKE_PTR(lease); return 0; }