/* SPDX-License-Identifier: LGPL-2.1-or-later */ /*** Copyright © 2014-2015 Intel Corporation. All rights reserved. ***/ #include #include #include "sd-dhcp6-client.h" #include "alloc-util.h" #include "dhcp6-internal.h" #include "dhcp6-option.h" #include "dhcp6-protocol.h" #include "dns-domain.h" #include "escape.h" #include "memory-util.h" #include "network-common.h" #include "strv.h" #include "unaligned.h" #define DHCP6_OPTION_IA_NA_LEN (sizeof(struct ia_na)) #define DHCP6_OPTION_IA_PD_LEN (sizeof(struct ia_pd)) #define DHCP6_OPTION_IA_TA_LEN (sizeof(struct ia_ta)) bool dhcp6_option_can_request(uint16_t option) { /* See Client ORO field in * https://www.iana.org/assignments/dhcpv6-parameters/dhcpv6-parameters.xhtml#dhcpv6-parameters-2 */ switch (option) { case SD_DHCP6_OPTION_CLIENTID: case SD_DHCP6_OPTION_SERVERID: case SD_DHCP6_OPTION_IA_NA: case SD_DHCP6_OPTION_IA_TA: case SD_DHCP6_OPTION_IAADDR: case SD_DHCP6_OPTION_ORO: case SD_DHCP6_OPTION_PREFERENCE: case SD_DHCP6_OPTION_ELAPSED_TIME: case SD_DHCP6_OPTION_RELAY_MSG: case SD_DHCP6_OPTION_AUTH: case SD_DHCP6_OPTION_UNICAST: case SD_DHCP6_OPTION_STATUS_CODE: case SD_DHCP6_OPTION_RAPID_COMMIT: case SD_DHCP6_OPTION_USER_CLASS: case SD_DHCP6_OPTION_VENDOR_CLASS: return false; case SD_DHCP6_OPTION_VENDOR_OPTS: return true; case SD_DHCP6_OPTION_INTERFACE_ID: case SD_DHCP6_OPTION_RECONF_MSG: case SD_DHCP6_OPTION_RECONF_ACCEPT: return false; case SD_DHCP6_OPTION_SIP_SERVER_DOMAIN_NAME: case SD_DHCP6_OPTION_SIP_SERVER_ADDRESS: case SD_DHCP6_OPTION_DNS_SERVER: case SD_DHCP6_OPTION_DOMAIN: return true; case SD_DHCP6_OPTION_IA_PD: case SD_DHCP6_OPTION_IA_PD_PREFIX: return false; case SD_DHCP6_OPTION_NIS_SERVER: case SD_DHCP6_OPTION_NISP_SERVER: case SD_DHCP6_OPTION_NIS_DOMAIN_NAME: case SD_DHCP6_OPTION_NISP_DOMAIN_NAME: case SD_DHCP6_OPTION_SNTP_SERVER: return true; case SD_DHCP6_OPTION_INFORMATION_REFRESH_TIME: return false; /* This is automatically set when sending INFORMATION_REQUEST message. */ case SD_DHCP6_OPTION_BCMCS_SERVER_D: case SD_DHCP6_OPTION_BCMCS_SERVER_A: case SD_DHCP6_OPTION_GEOCONF_CIVIC: return true; case SD_DHCP6_OPTION_REMOTE_ID: case SD_DHCP6_OPTION_SUBSCRIBER_ID: return false; case SD_DHCP6_OPTION_CLIENT_FQDN: case SD_DHCP6_OPTION_PANA_AGENT: case SD_DHCP6_OPTION_POSIX_TIMEZONE: case SD_DHCP6_OPTION_TZDB_TIMEZONE: return true; case SD_DHCP6_OPTION_ERO: case SD_DHCP6_OPTION_LQ_QUERY: case SD_DHCP6_OPTION_CLIENT_DATA: case SD_DHCP6_OPTION_CLT_TIME: case SD_DHCP6_OPTION_LQ_RELAY_DATA: case SD_DHCP6_OPTION_LQ_CLIENT_LINK: return false; case SD_DHCP6_OPTION_MIP6_HNIDF: case SD_DHCP6_OPTION_MIP6_VDINF: case SD_DHCP6_OPTION_V6_LOST: case SD_DHCP6_OPTION_CAPWAP_AC_V6: return true; case SD_DHCP6_OPTION_RELAY_ID: return false; case SD_DHCP6_OPTION_IPV6_ADDRESS_MOS: case SD_DHCP6_OPTION_IPV6_FQDN_MOS: case SD_DHCP6_OPTION_NTP_SERVER: case SD_DHCP6_OPTION_V6_ACCESS_DOMAIN: case SD_DHCP6_OPTION_SIP_UA_CS_LIST: case SD_DHCP6_OPTION_BOOTFILE_URL: case SD_DHCP6_OPTION_BOOTFILE_PARAM: return true; case SD_DHCP6_OPTION_CLIENT_ARCH_TYPE: return false; case SD_DHCP6_OPTION_NII: case SD_DHCP6_OPTION_GEOLOCATION: case SD_DHCP6_OPTION_AFTR_NAME: case SD_DHCP6_OPTION_ERP_LOCAL_DOMAIN_NAME: return true; case SD_DHCP6_OPTION_RSOO: return false; case SD_DHCP6_OPTION_PD_EXCLUDE: return true; case SD_DHCP6_OPTION_VSS: return false; case SD_DHCP6_OPTION_MIP6_IDINF: case SD_DHCP6_OPTION_MIP6_UDINF: case SD_DHCP6_OPTION_MIP6_HNP: case SD_DHCP6_OPTION_MIP6_HAA: case SD_DHCP6_OPTION_MIP6_HAF: case SD_DHCP6_OPTION_RDNSS_SELECTION: case SD_DHCP6_OPTION_KRB_PRINCIPAL_NAME: case SD_DHCP6_OPTION_KRB_REALM_NAME: case SD_DHCP6_OPTION_KRB_DEFAULT_REALM_NAME: case SD_DHCP6_OPTION_KRB_KDC: return true; case SD_DHCP6_OPTION_CLIENT_LINKLAYER_ADDR: case SD_DHCP6_OPTION_LINK_ADDRESS: case SD_DHCP6_OPTION_RADIUS: case SD_DHCP6_OPTION_SOL_MAX_RT: /* Automatically set when sending SOLICIT message. */ case SD_DHCP6_OPTION_INF_MAX_RT: /* Automatically set when sending INFORMATION_REQUEST message. */ return false; case SD_DHCP6_OPTION_ADDRSEL: case SD_DHCP6_OPTION_ADDRSEL_TABLE: case SD_DHCP6_OPTION_V6_PCP_SERVER: return true; case SD_DHCP6_OPTION_DHCPV4_MSG: return false; case SD_DHCP6_OPTION_DHCP4_O_DHCP6_SERVER: return true; case SD_DHCP6_OPTION_S46_RULE: return false; case SD_DHCP6_OPTION_S46_BR: return true; case SD_DHCP6_OPTION_S46_DMR: case SD_DHCP6_OPTION_S46_V4V6BIND: case SD_DHCP6_OPTION_S46_PORTPARAMS: return false; case SD_DHCP6_OPTION_S46_CONT_MAPE: case SD_DHCP6_OPTION_S46_CONT_MAPT: case SD_DHCP6_OPTION_S46_CONT_LW: case SD_DHCP6_OPTION_4RD: case SD_DHCP6_OPTION_4RD_MAP_RULE: case SD_DHCP6_OPTION_4RD_NON_MAP_RULE: return true; case SD_DHCP6_OPTION_LQ_BASE_TIME: case SD_DHCP6_OPTION_LQ_START_TIME: case SD_DHCP6_OPTION_LQ_END_TIME: return false; case SD_DHCP6_OPTION_CAPTIVE_PORTAL: case SD_DHCP6_OPTION_MPL_PARAMETERS: return true; case SD_DHCP6_OPTION_ANI_ATT: case SD_DHCP6_OPTION_ANI_NETWORK_NAME: case SD_DHCP6_OPTION_ANI_AP_NAME: case SD_DHCP6_OPTION_ANI_AP_BSSID: case SD_DHCP6_OPTION_ANI_OPERATOR_ID: case SD_DHCP6_OPTION_ANI_OPERATOR_REALM: return false; case SD_DHCP6_OPTION_S46_PRIORITY: return true; case SD_DHCP6_OPTION_MUD_URL_V6: return false; case SD_DHCP6_OPTION_V6_PREFIX64: return true; case SD_DHCP6_OPTION_F_BINDING_STATUS: case SD_DHCP6_OPTION_F_CONNECT_FLAGS: case SD_DHCP6_OPTION_F_DNS_REMOVAL_INFO: case SD_DHCP6_OPTION_F_DNS_HOST_NAME: case SD_DHCP6_OPTION_F_DNS_ZONE_NAME: case SD_DHCP6_OPTION_F_DNS_FLAGS: case SD_DHCP6_OPTION_F_EXPIRATION_TIME: case SD_DHCP6_OPTION_F_MAX_UNACKED_BNDUPD: case SD_DHCP6_OPTION_F_MCLT: case SD_DHCP6_OPTION_F_PARTNER_LIFETIME: case SD_DHCP6_OPTION_F_PARTNER_LIFETIME_SENT: case SD_DHCP6_OPTION_F_PARTNER_DOWN_TIME: case SD_DHCP6_OPTION_F_PARTNER_RAW_CLT_TIME: case SD_DHCP6_OPTION_F_PROTOCOL_VERSION: case SD_DHCP6_OPTION_F_KEEPALIVE_TIME: case SD_DHCP6_OPTION_F_RECONFIGURE_DATA: case SD_DHCP6_OPTION_F_RELATIONSHIP_NAME: case SD_DHCP6_OPTION_F_SERVER_FLAGS: case SD_DHCP6_OPTION_F_SERVER_STATE: case SD_DHCP6_OPTION_F_START_TIME_OF_STATE: case SD_DHCP6_OPTION_F_STATE_EXPIRATION_TIME: case SD_DHCP6_OPTION_RELAY_PORT: return false; case SD_DHCP6_OPTION_V6_SZTP_REDIRECT: case SD_DHCP6_OPTION_S46_BIND_IPV6_PREFIX: return true; case SD_DHCP6_OPTION_IA_LL: case SD_DHCP6_OPTION_LLADDR: case SD_DHCP6_OPTION_SLAP_QUAD: return false; case SD_DHCP6_OPTION_V6_DOTS_RI: case SD_DHCP6_OPTION_V6_DOTS_ADDRESS: case SD_DHCP6_OPTION_IPV6_ADDRESS_ANDSF: case SD_DHCP6_OPTION_V6_DNR: return true; default: return false; } } static int option_append_hdr(uint8_t **buf, size_t *offset, uint16_t optcode, size_t optlen) { assert(buf); assert(*buf); assert(offset); if (optlen > 0xffff) return -ENOBUFS; if (optlen + offsetof(DHCP6Option, data) > SIZE_MAX - *offset) return -ENOBUFS; if (!GREEDY_REALLOC(*buf, *offset + optlen + offsetof(DHCP6Option, data))) return -ENOMEM; unaligned_write_be16(*buf + *offset + offsetof(DHCP6Option, code), optcode); unaligned_write_be16(*buf + *offset + offsetof(DHCP6Option, len), optlen); *offset += offsetof(DHCP6Option, data); return 0; } int dhcp6_option_append( uint8_t **buf, size_t *offset, uint16_t code, size_t optlen, const void *optval) { int r; assert(optval || optlen == 0); r = option_append_hdr(buf, offset, code, optlen); if (r < 0) return r; memcpy_safe(*buf + *offset, optval, optlen); *offset += optlen; return 0; } int dhcp6_option_append_vendor_option(uint8_t **buf, size_t *offset, OrderedSet *vendor_options) { sd_dhcp6_option *options; int r; assert(buf); assert(*buf); assert(offset); ORDERED_SET_FOREACH(options, vendor_options) { _cleanup_free_ uint8_t *p = NULL; size_t total; total = 4 + 2 + 2 + options->length; p = malloc(total); if (!p) return -ENOMEM; unaligned_write_be32(p, options->enterprise_identifier); unaligned_write_be16(p + 4, options->option); unaligned_write_be16(p + 6, options->length); memcpy(p + 8, options->data, options->length); r = dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_VENDOR_OPTS, total, p); if (r < 0) return r; } return 0; } static int option_append_ia_address(uint8_t **buf, size_t *offset, const struct iaaddr *address) { assert(buf); assert(*buf); assert(offset); assert(address); /* Do not append T1 and T2. */ const struct iaaddr a = { .address = address->address, }; return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_IAADDR, sizeof(struct iaaddr), &a); } static int option_append_pd_prefix(uint8_t **buf, size_t *offset, const struct iapdprefix *prefix) { assert(buf); assert(*buf); assert(offset); assert(prefix); if (prefix->prefixlen == 0) return -EINVAL; /* Do not append T1 and T2. */ const struct iapdprefix p = { .prefixlen = prefix->prefixlen, .address = prefix->address, }; return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_IA_PD_PREFIX, sizeof(struct iapdprefix), &p); } int dhcp6_option_append_ia(uint8_t **buf, size_t *offset, const DHCP6IA *ia) { _cleanup_free_ uint8_t *data = NULL; struct ia_header header; size_t len; int r; assert(buf); assert(*buf); assert(offset); assert(ia); /* client should not send set T1 and T2. See, RFC 8415, and issue #18090. */ switch (ia->type) { case SD_DHCP6_OPTION_IA_NA: case SD_DHCP6_OPTION_IA_PD: len = sizeof(struct ia_header); header = (struct ia_header) { .id = ia->header.id, }; break; case SD_DHCP6_OPTION_IA_TA: len = sizeof(header.id); /* IA_TA does not have lifetime. */ header = (struct ia_header) { .id = ia->header.id, }; break; default: assert_not_reached(); } if (!GREEDY_REALLOC(data, len)) return -ENOMEM; memcpy(data, &header, len); LIST_FOREACH(addresses, addr, ia->addresses) { if (ia->type == SD_DHCP6_OPTION_IA_PD) r = option_append_pd_prefix(&data, &len, &addr->iapdprefix); else r = option_append_ia_address(&data, &len, &addr->iaaddr); if (r < 0) return r; } return dhcp6_option_append(buf, offset, ia->type, len, data); } int dhcp6_option_append_fqdn(uint8_t **buf, size_t *offset, const char *fqdn) { uint8_t buffer[1 + DNS_WIRE_FORMAT_HOSTNAME_MAX]; int r; assert(buf); assert(*buf); assert(offset); if (isempty(fqdn)) return 0; buffer[0] = DHCP6_FQDN_FLAG_S; /* Request server to perform AAAA RR DNS updates */ /* Store domain name after flags field */ r = dns_name_to_wire_format(fqdn, buffer + 1, sizeof(buffer) - 1, false); if (r <= 0) return r; /* * According to RFC 4704, chapter 4.2 only add terminating zero-length * label in case a FQDN is provided. Since dns_name_to_wire_format * always adds terminating zero-length label remove if only a hostname * is provided. */ if (dns_name_is_single_label(fqdn)) r--; return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_CLIENT_FQDN, 1 + r, buffer); } int dhcp6_option_append_user_class(uint8_t **buf, size_t *offset, char * const *user_class) { _cleanup_free_ uint8_t *p = NULL; size_t n = 0; assert(buf); assert(*buf); assert(offset); if (strv_isempty(user_class)) return 0; STRV_FOREACH(s, user_class) { size_t len = strlen(*s); if (len > UINT16_MAX || len == 0) return -EINVAL; if (!GREEDY_REALLOC(p, n + len + 2)) return -ENOMEM; unaligned_write_be16(p + n, len); memcpy(p + n + 2, *s, len); n += len + 2; } return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_USER_CLASS, n, p); } int dhcp6_option_append_vendor_class(uint8_t **buf, size_t *offset, char * const *vendor_class) { _cleanup_free_ uint8_t *p = NULL; size_t n = 0; assert(buf); assert(*buf); assert(offset); if (strv_isempty(vendor_class)) return 0; if (!GREEDY_REALLOC(p, sizeof(be32_t))) return -ENOMEM; /* Enterprise Identifier */ unaligned_write_be32(p, SYSTEMD_PEN); n += sizeof(be32_t); STRV_FOREACH(s, vendor_class) { size_t len = strlen(*s); if (len > UINT16_MAX || len == 0) return -EINVAL; if (!GREEDY_REALLOC(p, n + len + 2)) return -ENOMEM; unaligned_write_be16(p + n, len); memcpy(p + n + 2, *s, len); n += len + 2; } return dhcp6_option_append(buf, offset, SD_DHCP6_OPTION_VENDOR_CLASS, n, p); } int dhcp6_option_parse( const uint8_t *buf, size_t buflen, size_t *offset, uint16_t *ret_option_code, size_t *ret_option_data_len, const uint8_t **ret_option_data) { size_t len; assert(buf); assert(offset); assert(ret_option_code); assert(ret_option_data_len); assert(ret_option_data); if (buflen < offsetof(DHCP6Option, data)) return -EBADMSG; if (*offset > buflen - offsetof(DHCP6Option, data)) return -EBADMSG; len = unaligned_read_be16(buf + *offset + offsetof(DHCP6Option, len)); if (len > buflen - offsetof(DHCP6Option, data) - *offset) return -EBADMSG; *ret_option_code = unaligned_read_be16(buf + *offset + offsetof(DHCP6Option, code)); *ret_option_data_len = len; *ret_option_data = len == 0 ? NULL : buf + *offset + offsetof(DHCP6Option, data); *offset += offsetof(DHCP6Option, data) + len; return 0; } int dhcp6_option_parse_status(const uint8_t *data, size_t data_len, char **ret_status_message) { DHCP6Status status; assert(data || data_len == 0); if (data_len < sizeof(uint16_t)) return -EBADMSG; status = unaligned_read_be16(data); if (ret_status_message) { _cleanup_free_ char *msg = NULL; const char *s; /* The status message MUST NOT be null-terminated. See section 21.13 of RFC8415. * Let's escape unsafe characters for safety. */ msg = cescape_length((const char*) (data + sizeof(uint16_t)), data_len - sizeof(uint16_t)); if (!msg) return -ENOMEM; s = dhcp6_message_status_to_string(status); if (s && !strextend_with_separator(&msg, ": ", s)) return -ENOMEM; *ret_status_message = TAKE_PTR(msg); } return status; } /* parse a string from dhcp option field. *ret must be initialized */ int dhcp6_option_parse_string(const uint8_t *data, size_t data_len, char **ret) { _cleanup_free_ char *string = NULL; int r; assert(data || data_len == 0); assert(ret); if (data_len <= 0) { *ret = mfree(*ret); return 0; } r = make_cstring((const char *) data, data_len, MAKE_CSTRING_REFUSE_TRAILING_NUL, &string); if (r < 0) return r; return free_and_replace(*ret, string); } static int dhcp6_option_parse_ia_options(sd_dhcp6_client *client, const uint8_t *buf, size_t buflen) { int r; assert(buf || buflen == 0); for (size_t offset = 0; offset < buflen;) { const uint8_t *data; size_t data_len; uint16_t code; r = dhcp6_option_parse(buf, buflen, &offset, &code, &data_len, &data); if (r < 0) return r; switch (code) { case SD_DHCP6_OPTION_STATUS_CODE: { _cleanup_free_ char *msg = NULL; r = dhcp6_option_parse_status(data, data_len, &msg); if (r == -ENOMEM) return r; if (r > 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an IA address or PD prefix option with non-zero status%s%s", isempty(msg) ? "." : ": ", strempty(msg)); if (r < 0) /* Let's log but ignore the invalid status option. */ log_dhcp6_client_errno(client, r, "Received an IA address or PD prefix option with an invalid status sub option, ignoring: %m"); break; } default: log_dhcp6_client(client, "Received an unknown sub option %u in IA address or PD prefix, ignoring.", code); } } return 0; } static int dhcp6_option_parse_ia_address(sd_dhcp6_client *client, DHCP6IA *ia, const uint8_t *data, size_t len) { _cleanup_free_ DHCP6Address *a = NULL; usec_t lt_valid, lt_pref; int r; assert(ia); assert(data || len == 0); if (!IN_SET(ia->type, SD_DHCP6_OPTION_IA_NA, SD_DHCP6_OPTION_IA_TA)) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an IA address sub-option in an invalid option, ignoring."); if (len < sizeof(struct iaaddr)) return -EBADMSG; a = new(DHCP6Address, 1); if (!a) return -ENOMEM; memcpy(&a->iaaddr, data, sizeof(struct iaaddr)); lt_valid = be32_sec_to_usec(a->iaaddr.lifetime_valid, /* max_as_infinity = */ true); lt_pref = be32_sec_to_usec(a->iaaddr.lifetime_preferred, /* max_as_infinity = */ true); if (lt_valid == 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an IA address with zero valid lifetime, ignoring."); if (lt_pref > lt_valid) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an IA address with preferred lifetime %s " "larger than valid lifetime %s, ignoring.", FORMAT_TIMESPAN(lt_pref, USEC_PER_SEC), FORMAT_TIMESPAN(lt_valid, USEC_PER_SEC)); if (len > sizeof(struct iaaddr)) { r = dhcp6_option_parse_ia_options(client, data + sizeof(struct iaaddr), len - sizeof(struct iaaddr)); if (r < 0) return r; } LIST_PREPEND(addresses, ia->addresses, TAKE_PTR(a)); return 0; } static int dhcp6_option_parse_ia_pdprefix(sd_dhcp6_client *client, DHCP6IA *ia, const uint8_t *data, size_t len) { _cleanup_free_ DHCP6Address *a = NULL; usec_t lt_valid, lt_pref; int r; assert(ia); assert(data || len == 0); if (ia->type != SD_DHCP6_OPTION_IA_PD) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an PD prefix sub-option in an invalid option, ignoring"); if (len < sizeof(struct iapdprefix)) return -EBADMSG; a = new(DHCP6Address, 1); if (!a) return -ENOMEM; memcpy(&a->iapdprefix, data, sizeof(struct iapdprefix)); lt_valid = be32_sec_to_usec(a->iapdprefix.lifetime_valid, /* max_as_infinity = */ true); lt_pref = be32_sec_to_usec(a->iapdprefix.lifetime_preferred, /* max_as_infinity = */ true); if (lt_valid == 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received a PD prefix with zero valid lifetime, ignoring."); if (lt_pref > lt_valid) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received a PD prefix with preferred lifetime %s " "larger than valid lifetime %s, ignoring.", FORMAT_TIMESPAN(lt_pref, USEC_PER_SEC), FORMAT_TIMESPAN(lt_valid, USEC_PER_SEC)); if (len > sizeof(struct iapdprefix)) { r = dhcp6_option_parse_ia_options(client, data + sizeof(struct iapdprefix), len - sizeof(struct iapdprefix)); if (r < 0) return r; } LIST_PREPEND(addresses, ia->addresses, TAKE_PTR(a)); return 0; } int dhcp6_option_parse_ia( sd_dhcp6_client *client, be32_t iaid, uint16_t option_code, size_t option_data_len, const uint8_t *option_data, DHCP6IA **ret) { _cleanup_(dhcp6_ia_freep) DHCP6IA *ia = NULL; usec_t lt_t1, lt_t2; size_t header_len; int r; assert(IN_SET(option_code, SD_DHCP6_OPTION_IA_NA, SD_DHCP6_OPTION_IA_TA, SD_DHCP6_OPTION_IA_PD)); assert(option_data || option_data_len == 0); assert(ret); /* This will return the following: * -ENOMEM: memory allocation error, * -ENOANO: unmatching IAID, * -EINVAL: non-zero status code, or invalid lifetime, * -EBADMSG: invalid message format, * -ENODATA: no valid address or PD prefix, * 0: success. */ switch (option_code) { case SD_DHCP6_OPTION_IA_NA: case SD_DHCP6_OPTION_IA_PD: header_len = sizeof(struct ia_header); break; case SD_DHCP6_OPTION_IA_TA: header_len = sizeof(be32_t); /* IA_TA does not have lifetime. */ break; default: assert_not_reached(); } if (option_data_len < header_len) return -EBADMSG; ia = new(DHCP6IA, 1); if (!ia) return -ENOMEM; *ia = (DHCP6IA) { .type = option_code, }; memcpy(&ia->header, option_data, header_len); /* According to RFC8415, IAs which do not match the client's IAID should be ignored, * but not necessary to ignore or refuse the whole message. */ if (ia->header.id != iaid) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(ENOANO), "Received an IA option with a different IAID " "from the one chosen by the client, ignoring."); /* It is not necessary to check if the lifetime_t2 is zero here, as in that case it will be updated later. */ lt_t1 = be32_sec_to_usec(ia->header.lifetime_t1, /* max_as_infinity = */ true); lt_t2 = be32_sec_to_usec(ia->header.lifetime_t2, /* max_as_infinity = */ true); if (lt_t1 > lt_t2) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an IA option with T1 %s > T2 %s, ignoring.", FORMAT_TIMESPAN(lt_t1, USEC_PER_SEC), FORMAT_TIMESPAN(lt_t2, USEC_PER_SEC)); if (lt_t1 == 0 && lt_t2 > 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an IA option with zero T1 and non-zero T2 (%s), ignoring.", FORMAT_TIMESPAN(lt_t2, USEC_PER_SEC)); for (size_t offset = header_len; offset < option_data_len;) { const uint8_t *subdata; size_t subdata_len; uint16_t subopt; r = dhcp6_option_parse(option_data, option_data_len, &offset, &subopt, &subdata_len, &subdata); if (r < 0) return r; switch (subopt) { case SD_DHCP6_OPTION_IAADDR: { r = dhcp6_option_parse_ia_address(client, ia, subdata, subdata_len); if (r == -ENOMEM) return r; /* Ignore non-critical errors in the sub-option. */ break; } case SD_DHCP6_OPTION_IA_PD_PREFIX: { r = dhcp6_option_parse_ia_pdprefix(client, ia, subdata, subdata_len); if (r == -ENOMEM) return r; /* Ignore non-critical errors in the sub-option. */ break; } case SD_DHCP6_OPTION_STATUS_CODE: { _cleanup_free_ char *msg = NULL; r = dhcp6_option_parse_status(subdata, subdata_len, &msg); if (r == -ENOMEM) return r; if (r > 0) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(EINVAL), "Received an IA option with non-zero status%s%s", isempty(msg) ? "." : ": ", strempty(msg)); if (r < 0) log_dhcp6_client_errno(client, r, "Received an IA option with an invalid status sub option, ignoring: %m"); break; } default: log_dhcp6_client(client, "Received an IA option with an unknown sub-option %u, ignoring", subopt); } } if (!ia->addresses) return log_dhcp6_client_errno(client, SYNTHETIC_ERRNO(ENODATA), "Received an IA option without valid IA addresses or PD prefixes, ignoring."); *ret = TAKE_PTR(ia); return 0; } int dhcp6_option_parse_addresses( const uint8_t *optval, size_t optlen, struct in6_addr **addrs, size_t *count) { assert(optval || optlen == 0); assert(addrs); assert(count); if (optlen == 0 || optlen % sizeof(struct in6_addr) != 0) return -EBADMSG; if (!GREEDY_REALLOC(*addrs, *count + optlen / sizeof(struct in6_addr))) return -ENOMEM; memcpy(*addrs + *count, optval, optlen); *count += optlen / sizeof(struct in6_addr); return 0; } int dhcp6_option_parse_domainname(const uint8_t *optval, size_t optlen, char **ret) { _cleanup_free_ char *domain = NULL; int r; assert(optval || optlen == 0); assert(ret); r = dns_name_from_wire_format(&optval, &optlen, &domain); if (r < 0) return r; if (r == 0) return -ENODATA; if (optlen != 0) return -EINVAL; *ret = TAKE_PTR(domain); return 0; } int dhcp6_option_parse_domainname_list(const uint8_t *optval, size_t optlen, char ***ret) { _cleanup_strv_free_ char **names = NULL; int r; assert(optval || optlen == 0); assert(ret); if (optlen <= 1) return -ENODATA; if (optval[optlen - 1] != '\0') return -EINVAL; while (optlen > 0) { _cleanup_free_ char *name = NULL; r = dns_name_from_wire_format(&optval, &optlen, &name); if (r < 0) return r; if (dns_name_is_root(name)) /* root domain */ return -EBADMSG; r = strv_consume(&names, TAKE_PTR(name)); if (r < 0) return r; } *ret = TAKE_PTR(names); return 0; } static sd_dhcp6_option* dhcp6_option_free(sd_dhcp6_option *i) { if (!i) return NULL; free(i->data); return mfree(i); } int sd_dhcp6_option_new(uint16_t option, const void *data, size_t length, uint32_t enterprise_identifier, sd_dhcp6_option **ret) { assert_return(ret, -EINVAL); assert_return(length == 0 || data, -EINVAL); _cleanup_free_ void *q = memdup(data, length); if (!q) return -ENOMEM; sd_dhcp6_option *p = new(sd_dhcp6_option, 1); if (!p) return -ENOMEM; *p = (sd_dhcp6_option) { .n_ref = 1, .option = option, .enterprise_identifier = enterprise_identifier, .length = length, .data = TAKE_PTR(q), }; *ret = p; return 0; } DEFINE_TRIVIAL_REF_UNREF_FUNC(sd_dhcp6_option, sd_dhcp6_option, dhcp6_option_free); DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR( dhcp6_option_hash_ops, void, trivial_hash_func, trivial_compare_func, sd_dhcp6_option, sd_dhcp6_option_unref);