1 /* $OpenBSD: lsreq.c,v 1.15 2023/07/03 09:51:38 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2004, 2005, 2007 Esben Norby <norby@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/socket.h> 21 #include <netinet/in.h> 22 #include <netinet/ip6.h> 23 #include <arpa/inet.h> 24 #include <stdlib.h> 25 26 #include "ospf6d.h" 27 #include "ospf6.h" 28 #include "log.h" 29 #include "ospfe.h" 30 31 /* link state request packet handling */ 32 int 33 send_ls_req(struct nbr *nbr) 34 { 35 struct in6_addr dst; 36 struct ls_req_hdr ls_req_hdr; 37 struct lsa_entry *le, *nle; 38 struct ibuf *buf; 39 40 if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip6_hdr))) == NULL) 41 fatal("send_ls_req"); 42 43 switch (nbr->iface->type) { 44 case IF_TYPE_POINTOPOINT: 45 inet_pton(AF_INET6, AllSPFRouters, &dst); 46 break; 47 case IF_TYPE_BROADCAST: 48 case IF_TYPE_NBMA: 49 case IF_TYPE_POINTOMULTIPOINT: 50 case IF_TYPE_VIRTUALLINK: 51 dst = nbr->addr; 52 break; 53 default: 54 fatalx("send_ls_req: unknown interface type"); 55 } 56 57 /* OSPF header */ 58 if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_LS_REQUEST)) 59 goto fail; 60 61 /* LSA header(s) */ 62 for (le = TAILQ_FIRST(&nbr->ls_req_list); 63 le != NULL && sizeof(ls_req_hdr) < ibuf_left(buf); 64 le = nle) { 65 nbr->ls_req = nle = TAILQ_NEXT(le, entry); 66 ls_req_hdr.zero = 0; 67 ls_req_hdr.type = le->le_lsa->type; 68 ls_req_hdr.ls_id = le->le_lsa->ls_id; 69 ls_req_hdr.adv_rtr = le->le_lsa->adv_rtr; 70 if (ibuf_add(buf, &ls_req_hdr, sizeof(ls_req_hdr))) 71 goto fail; 72 } 73 74 /* calculate checksum */ 75 if (upd_ospf_hdr(buf, nbr->iface)) 76 goto fail; 77 78 if (send_packet(nbr->iface, buf, &dst) == -1) 79 goto fail; 80 81 ibuf_free(buf); 82 return (0); 83 fail: 84 log_warn("send_ls_req"); 85 ibuf_free(buf); 86 return (-1); 87 } 88 89 void 90 recv_ls_req(struct nbr *nbr, char *buf, u_int16_t len) 91 { 92 switch (nbr->state) { 93 case NBR_STA_DOWN: 94 case NBR_STA_ATTEMPT: 95 case NBR_STA_INIT: 96 case NBR_STA_2_WAY: 97 case NBR_STA_XSTRT: 98 case NBR_STA_SNAP: 99 log_debug("recv_ls_req: packet ignored in state %s, " 100 "neighbor ID %s (%s)", nbr_state_name(nbr->state), 101 inet_ntoa(nbr->id), nbr->iface->name); 102 break; 103 case NBR_STA_XCHNG: 104 case NBR_STA_LOAD: 105 case NBR_STA_FULL: 106 ospfe_imsg_compose_rde(IMSG_LS_REQ, nbr->peerid, 0, buf, len); 107 break; 108 default: 109 fatalx("recv_ls_req: unknown neighbor state"); 110 } 111 } 112 113 /* link state request list */ 114 void 115 ls_req_list_add(struct nbr *nbr, struct lsa_hdr *lsa) 116 { 117 struct lsa_entry *le; 118 119 if (lsa == NULL) 120 fatalx("ls_req_list_add: no LSA header"); 121 122 if ((le = calloc(1, sizeof(*le))) == NULL) 123 fatal("ls_req_list_add"); 124 125 TAILQ_INSERT_TAIL(&nbr->ls_req_list, le, entry); 126 le->le_lsa = lsa; 127 nbr->ls_req_cnt++; 128 } 129 130 struct lsa_entry * 131 ls_req_list_get(struct nbr *nbr, struct lsa_hdr *lsa_hdr) 132 { 133 struct lsa_entry *le; 134 135 TAILQ_FOREACH(le, &nbr->ls_req_list, entry) { 136 if ((lsa_hdr->type == le->le_lsa->type) && 137 (lsa_hdr->ls_id == le->le_lsa->ls_id) && 138 (lsa_hdr->adv_rtr == le->le_lsa->adv_rtr)) 139 return (le); 140 } 141 return (NULL); 142 } 143 144 void 145 ls_req_list_free(struct nbr *nbr, struct lsa_entry *le) 146 { 147 if (nbr->ls_req == le) { 148 nbr->ls_req = TAILQ_NEXT(le, entry); 149 } 150 151 TAILQ_REMOVE(&nbr->ls_req_list, le, entry); 152 free(le->le_lsa); 153 free(le); 154 nbr->ls_req_cnt--; 155 156 /* received all requested LSA(s), send a new LS req */ 157 if (nbr->ls_req != NULL && 158 nbr->ls_req == TAILQ_FIRST(&nbr->ls_req_list)) { 159 start_ls_req_tx_timer(nbr); 160 } 161 162 /* we might not have received all DDs and are still in XCHNG */ 163 if (ls_req_list_empty(nbr) && nbr->dd_pending == 0 && 164 nbr->state != NBR_STA_XCHNG) 165 nbr_fsm(nbr, NBR_EVT_LOAD_DONE); 166 } 167 168 void 169 ls_req_list_clr(struct nbr *nbr) 170 { 171 struct lsa_entry *le; 172 173 while ((le = TAILQ_FIRST(&nbr->ls_req_list)) != NULL) { 174 TAILQ_REMOVE(&nbr->ls_req_list, le, entry); 175 free(le->le_lsa); 176 free(le); 177 } 178 179 nbr->ls_req_cnt = 0; 180 nbr->ls_req = NULL; 181 } 182 183 int 184 ls_req_list_empty(struct nbr *nbr) 185 { 186 return (TAILQ_EMPTY(&nbr->ls_req_list)); 187 } 188 189 /* timers */ 190 void 191 ls_req_tx_timer(int fd, short event, void *arg) 192 { 193 struct nbr *nbr = arg; 194 struct timeval tv; 195 196 switch (nbr->state) { 197 case NBR_STA_DOWN: 198 case NBR_STA_ATTEMPT: 199 case NBR_STA_INIT: 200 case NBR_STA_2_WAY: 201 case NBR_STA_SNAP: 202 case NBR_STA_XSTRT: 203 case NBR_STA_XCHNG: 204 return; 205 case NBR_STA_LOAD: 206 send_ls_req(nbr); 207 break; 208 case NBR_STA_FULL: 209 return; 210 default: 211 log_debug("ls_req_tx_timer: unknown neighbor state, " 212 "neighbor ID %s (%s)", inet_ntoa(nbr->id), 213 nbr->iface->name); 214 break; 215 } 216 217 /* reschedule lsreq_tx_timer */ 218 if (nbr->state == NBR_STA_LOAD) { 219 timerclear(&tv); 220 tv.tv_sec = nbr->iface->rxmt_interval; 221 if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1) 222 fatal("ls_req_tx_timer"); 223 } 224 } 225 226 void 227 start_ls_req_tx_timer(struct nbr *nbr) 228 { 229 struct timeval tv; 230 231 if (nbr == nbr->iface->self) 232 return; 233 234 timerclear(&tv); 235 if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1) 236 fatal("start_ls_req_tx_timer"); 237 } 238 239 void 240 stop_ls_req_tx_timer(struct nbr *nbr) 241 { 242 if (nbr == nbr->iface->self) 243 return; 244 245 if (evtimer_del(&nbr->lsreq_tx_timer) == -1) 246 fatal("stop_ls_req_tx_timer"); 247 } 248