diff options
Diffstat (limited to 'src/libsystemd-network/sd-dhcp6-lease.c')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp6-lease.c | 731 |
1 files changed, 731 insertions, 0 deletions
diff --git a/src/libsystemd-network/sd-dhcp6-lease.c b/src/libsystemd-network/sd-dhcp6-lease.c new file mode 100644 index 0000000..973af10 --- /dev/null +++ b/src/libsystemd-network/sd-dhcp6-lease.c @@ -0,0 +1,731 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/*** + Copyright © 2014-2015 Intel Corporation. All rights reserved. +***/ + +#include <errno.h> + +#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; + + if (len - offset < offsetof(DHCP6Option, data)) { + log_dhcp6_client(client, "Ignoring %zu invalid byte(s) at the end of the packet", len - offset); + break; + } + + 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((be32_t *) 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; +} |