X-Git-Url: https://git.decadent.org.uk/gitweb/?p=odhcp6c.git;a=blobdiff_plain;f=src%2Fdhcpv6.c;h=b7fccaca62e78e9a048b8da5151677523ef69dcd;hp=215f68c86e3c92677959e5120b46777908d4c95c;hb=0300fe7589a1701361735ac068e4b57bb1a1896f;hpb=58f5bf8da1f5dca44abc31f454ce651a6927cc85 diff --git a/src/dhcpv6.c b/src/dhcpv6.c index 215f68c..b7fccac 100644 --- a/src/dhcpv6.c +++ b/src/dhcpv6.c @@ -176,6 +176,12 @@ int init_dhcpv6(const char *ifname, unsigned int options, int sol_timeout) #ifdef EXT_PREFIX_CLASS htons(DHCPV6_OPT_PREFIX_CLASS), #endif +#ifdef EXT_CER_ID + htons(DHCPV6_OPT_CER_ID), +#endif + htons(DHCPV6_OPT_S46_CONT_MAPE), + htons(DHCPV6_OPT_S46_CONT_MAPT), + htons(DHCPV6_OPT_S46_CONT_LW), }; odhcp6c_add_state(STATE_ORO, oro, sizeof(oro)); } @@ -185,8 +191,6 @@ int init_dhcpv6(const char *ifname, unsigned int options, int sol_timeout) setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val)); setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)); setsockopt(sock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val, sizeof(val)); - val = 0; - setsockopt(sock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &val, sizeof(val)); setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, ifname, strlen(ifname)); struct sockaddr_in6 client_addr = { .sin6_family = AF_INET6, @@ -197,6 +201,23 @@ int init_dhcpv6(const char *ifname, unsigned int options, int sol_timeout) return 0; } +enum { + IOV_HDR=0, + IOV_ORO, + IOV_ORO_REFRESH, + IOV_CL_ID, + IOV_SRV_ID, + IOV_VENDOR_CLASS_HDR, + IOV_VENDOR_CLASS, + IOV_USER_CLASS_HDR, + IOV_USER_CLASS, + IOV_RECONF_ACCEPT, + IOV_FQDN, + IOV_HDR_IA_NA, + IOV_IA_NA, + IOV_IA_PD, + IOV_TOTAL +}; void dhcpv6_set_ia_mode(enum odhcp6c_ia_mode na, enum odhcp6c_ia_mode pd) { @@ -231,7 +252,7 @@ static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs) void *srv_id = odhcp6c_get_state(STATE_SERVER_ID, &srv_id_len); // Build IA_PDs - size_t ia_pd_entries, ia_pd_len = 0; + size_t ia_pd_entries = 0, ia_pd_len = 0; uint8_t *ia_pd; if (type == DHCPV6_MSG_SOLICIT) { @@ -343,7 +364,7 @@ static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs) struct dhcpv6_ia_hdr hdr_ia_na = { htons(DHCPV6_OPT_IA_NA), htons(sizeof(hdr_ia_na) - 4), - 1, 0, 0 + htonl(1), 0, 0 }; struct dhcpv6_ia_addr pa[ia_na_entries]; @@ -401,47 +422,45 @@ static void dhcpv6_send(enum dhcpv6_msg type, uint8_t trid[3], uint32_t ecs) htons(DHCPV6_OPT_ORO), htons(oro_len), }; - struct iovec iov[] = { - {&hdr, sizeof(hdr)}, - {oro, oro_len}, - {&oro_refresh, 0}, - {cl_id, cl_id_len}, - {srv_id, srv_id_len}, - {&vendor_class_hdr, vendor_class_len ? sizeof(vendor_class_hdr) : 0}, - {vendor_class, vendor_class_len}, - {&user_class_hdr, user_class_len ? sizeof(user_class_hdr) : 0}, - {user_class, user_class_len}, - {&reconf_accept, sizeof(reconf_accept)}, - {&fqdn, fqdn_len}, - {&hdr_ia_na, sizeof(hdr_ia_na)}, - {ia_na, ia_na_len}, - {ia_pd, ia_pd_len}, + struct iovec iov[IOV_TOTAL] = { + [IOV_HDR] = {&hdr, sizeof(hdr)}, + [IOV_ORO] = {oro, oro_len}, + [IOV_ORO_REFRESH] = {&oro_refresh, 0}, + [IOV_CL_ID] = {cl_id, cl_id_len}, + [IOV_SRV_ID] = {srv_id, srv_id_len}, + [IOV_VENDOR_CLASS_HDR] = {&vendor_class_hdr, vendor_class_len ? sizeof(vendor_class_hdr) : 0}, + [IOV_VENDOR_CLASS] = {vendor_class, vendor_class_len}, + [IOV_USER_CLASS_HDR] = {&user_class_hdr, user_class_len ? sizeof(user_class_hdr) : 0}, + [IOV_USER_CLASS] = {user_class, user_class_len}, + [IOV_RECONF_ACCEPT] = {&reconf_accept, sizeof(reconf_accept)}, + [IOV_FQDN] = {&fqdn, fqdn_len}, + [IOV_HDR_IA_NA] = {&hdr_ia_na, sizeof(hdr_ia_na)}, + [IOV_IA_NA] = {ia_na, ia_na_len}, + [IOV_IA_PD] = {ia_pd, ia_pd_len}, }; - size_t cnt = ARRAY_SIZE(iov); + size_t cnt = IOV_TOTAL; if (type == DHCPV6_MSG_INFO_REQ) { cnt = 9; - iov[2].iov_len = sizeof(oro_refresh); + iov[IOV_ORO_REFRESH].iov_len = sizeof(oro_refresh); hdr.oro_len = htons(oro_len + sizeof(oro_refresh)); } else if (!request_prefix) { cnt = 13; } // Disable IAs if not used - if (type != DHCPV6_MSG_SOLICIT) { - iov[9].iov_len = 0; - if (ia_na_len == 0) - iov[11].iov_len = 0; - } + if (type != DHCPV6_MSG_SOLICIT && ia_na_len == 0) + iov[IOV_HDR_IA_NA].iov_len = 0; if (na_mode == IA_MODE_NONE) - iov[11].iov_len = 0; + iov[IOV_HDR_IA_NA].iov_len = 0; - if (!(client_options & DHCPV6_ACCEPT_RECONFIGURE)) - iov[9].iov_len = 0; + if ((type != DHCPV6_MSG_SOLICIT && type != DHCPV6_MSG_REQUEST) || + !(client_options & DHCPV6_ACCEPT_RECONFIGURE)) + iov[IOV_RECONF_ACCEPT].iov_len = 0; if (!(client_options & DHCPV6_CLIENT_FQDN)) - iov[10].iov_len = 0; + iov[IOV_FQDN].iov_len = 0; struct sockaddr_in6 srv = {AF_INET6, htons(DHCPV6_SERVER_PORT), 0, ALL_DHCPV6_RELAYS, ifindex}; @@ -642,10 +661,12 @@ static bool dhcpv6_response_is_valid(const void *buf, ssize_t len, continue; md5_ctx_t md5; - uint8_t serverhash[16], secretbytes[16], hash[16]; + uint8_t serverhash[16], secretbytes[64], hash[16]; memcpy(serverhash, r->key, sizeof(serverhash)); memset(r->key, 0, sizeof(r->key)); - memcpy(secretbytes, reconf_key, sizeof(secretbytes)); + + memset(secretbytes, 0, sizeof(secretbytes)); + memcpy(secretbytes, reconf_key, sizeof(reconf_key)); for (size_t i = 0; i < sizeof(secretbytes); ++i) secretbytes[i] ^= 0x36; @@ -895,16 +916,23 @@ static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc, odhcp6c_clear_state(STATE_SIP_IP); odhcp6c_clear_state(STATE_SIP_FQDN); odhcp6c_clear_state(STATE_AFTR_NAME); + odhcp6c_clear_state(STATE_CER); + odhcp6c_clear_state(STATE_S46_MAPT); + odhcp6c_clear_state(STATE_S46_MAPE); + odhcp6c_clear_state(STATE_S46_LW); + odhcp6c_clear_state(STATE_PASSTHRU); } // Parse and find all matching IAs dhcpv6_for_each_option(opt, end, otype, olen, odata) { + bool passthru = true; + if ((otype == DHCPV6_OPT_IA_PD || otype == DHCPV6_OPT_IA_NA) && olen > sizeof(struct dhcpv6_ia_hdr)) { struct dhcpv6_ia_hdr *ia_hdr = (void*)(&odata[-4]); // Test ID - if (ia_hdr->iaid != 1 && otype == DHCPV6_OPT_IA_NA) + if (ia_hdr->iaid != htonl(1) && otype == DHCPV6_OPT_IA_NA) continue; uint16_t code = DHCPV6_Success; @@ -936,18 +964,21 @@ static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc, continue; dhcpv6_parse_ia(ia_hdr, odata + olen + sizeof(*ia_hdr)); + passthru = false; } else if (otype == DHCPV6_OPT_STATUS && olen >= 2) { uint8_t *mdata = (olen > 2) ? &odata[2] : NULL; uint16_t mlen = (olen > 2) ? olen - 2 : 0; uint16_t code = ((int)odata[0]) << 8 | ((int)odata[1]); dhcpv6_handle_status_code(orig, code, mdata, mlen, &ret); + passthru = false; } else if (otype == DHCPV6_OPT_DNS_SERVERS) { if (olen % 16 == 0) odhcp6c_add_state(STATE_DNS, odata, olen); } else if (otype == DHCPV6_OPT_DNS_DOMAIN) { odhcp6c_add_state(STATE_SEARCH, odata, olen); + passthru = false; } else if (otype == DHCPV6_OPT_SNTP_SERVERS) { if (olen % 16 == 0) odhcp6c_add_state(STATE_SNTP_IP, odata, olen); @@ -972,32 +1003,68 @@ static int dhcpv6_handle_reply(enum dhcpv6_msg orig, _unused const int rc, odhcp6c_add_state(STATE_SIP_FQDN, odata, olen); } else if (otype == DHCPV6_OPT_INFO_REFRESH && olen >= 4) { refresh = ntohl(*((uint32_t*)odata)); - } else if (otype == DHCPV6_OPT_AUTH && olen == -4 + - sizeof(struct dhcpv6_auth_reconfigure)) { - struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4]; - if (r->protocol == 3 && r->algorithm == 1 && - r->reconf_type == 1) - memcpy(reconf_key, r->key, sizeof(r->key)); + passthru = false; + } else if (otype == DHCPV6_OPT_AUTH) { + if (olen == -4 + sizeof(struct dhcpv6_auth_reconfigure)) { + struct dhcpv6_auth_reconfigure *r = (void*)&odata[-4]; + if (r->protocol == 3 && r->algorithm == 1 && + r->reconf_type == 1) + memcpy(reconf_key, r->key, sizeof(r->key)); + } + passthru = false; } else if (otype == DHCPV6_OPT_AFTR_NAME && olen > 3) { size_t cur_len; odhcp6c_get_state(STATE_AFTR_NAME, &cur_len); if (cur_len == 0) odhcp6c_add_state(STATE_AFTR_NAME, odata, olen); + passthru = false; } else if (otype == DHCPV6_OPT_SOL_MAX_RT && olen == 4) { uint32_t sol_max_rt = ntohl(*((uint32_t *)odata)); if (sol_max_rt >= DHCPV6_SOL_MAX_RT_MIN && sol_max_rt <= DHCPV6_SOL_MAX_RT_MAX) dhcpv6_retx[DHCPV6_MSG_SOLICIT].max_timeo = sol_max_rt; + passthru = false; } else if (otype == DHCPV6_OPT_INF_MAX_RT && olen == 4) { uint32_t inf_max_rt = ntohl(*((uint32_t *)odata)); if (inf_max_rt >= DHCPV6_INF_MAX_RT_MIN && inf_max_rt <= DHCPV6_INF_MAX_RT_MAX) dhcpv6_retx[DHCPV6_MSG_INFO_REQ].max_timeo = inf_max_rt; - }else if (otype != DHCPV6_OPT_CLIENTID && - otype != DHCPV6_OPT_SERVERID) { - odhcp6c_add_state(STATE_CUSTOM_OPTS, - &odata[-4], olen + 4); + passthru = false; +#ifdef EXT_CER_ID + } else if (otype == DHCPV6_OPT_CER_ID && olen == -4 + + sizeof(struct dhcpv6_cer_id)) { + struct dhcpv6_cer_id *cer_id = (void*)&odata[-4]; + struct in6_addr any = IN6ADDR_ANY_INIT; + if (memcmp(&cer_id->addr, &any, sizeof(any))) + odhcp6c_add_state(STATE_CER, &cer_id->addr, sizeof(any)); + passthru = false; +#endif + } else if (otype == DHCPV6_OPT_S46_CONT_MAPT) { + odhcp6c_add_state(STATE_S46_MAPT, odata, olen); + passthru = false; + } else if (otype == DHCPV6_OPT_S46_CONT_MAPE) { + size_t mape_len; + odhcp6c_get_state(STATE_S46_MAPE, &mape_len); + if (mape_len == 0) + odhcp6c_add_state(STATE_S46_MAPE, odata, olen); + passthru = false; + } else if (otype == DHCPV6_OPT_S46_CONT_LW) { + odhcp6c_add_state(STATE_S46_LW, odata, olen); + passthru = false; + } else if (otype == DHCPV6_OPT_CLIENTID || + otype == DHCPV6_OPT_SERVERID || + otype == DHCPV6_OPT_IA_TA || + otype == DHCPV6_OPT_PREF || + otype == DHCPV6_OPT_UNICAST || + otype == DHCPV6_OPT_FQDN || + otype == DHCPV6_OPT_RECONF_ACCEPT) { + passthru = false; + } else { + odhcp6c_add_state(STATE_CUSTOM_OPTS, &odata[-4], olen + 4); } + + if (passthru) + odhcp6c_add_state(STATE_PASSTHRU, &odata[-4], olen + 4); } if (orig != DHCPV6_MSG_INFO_REQ) { @@ -1343,8 +1410,7 @@ int dhcpv6_promote_server_cand(void) size_t cand_len; struct dhcpv6_server_cand *cand = odhcp6c_get_state(STATE_SERVER_CAND, &cand_len); uint16_t hdr[2]; - int ret = (na_mode == IA_MODE_NONE && pd_mode == IA_MODE_NONE) ? - DHCPV6_STATELESS : DHCPV6_STATEFUL; + int ret = DHCPV6_STATELESS; // Clear lingering candidate state info odhcp6c_clear_state(STATE_SERVER_ID);