1 /* $OpenBSD: lsreq.c,v 1.9 2019/05/10 13:50:34 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 extern struct imsgev *iev_rde; 32 33 /* link state request packet handling */ 34 int 35 send_ls_req(struct nbr *nbr) 36 { 37 struct in6_addr dst; 38 struct ls_req_hdr ls_req_hdr; 39 struct lsa_entry *le, *nle; 40 struct ibuf *buf; 41 int ret; 42 43 if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip6_hdr))) == NULL) 44 fatal("send_ls_req"); 45 46 switch (nbr->iface->type) { 47 case IF_TYPE_POINTOPOINT: 48 inet_pton(AF_INET6, AllSPFRouters, &dst); 49 break; 50 case IF_TYPE_BROADCAST: 51 case IF_TYPE_NBMA: 52 case IF_TYPE_POINTOMULTIPOINT: 53 case IF_TYPE_VIRTUALLINK: 54 dst = nbr->addr; 55 break; 56 default: 57 fatalx("send_ls_req: unknown interface type"); 58 } 59 60 /* OSPF header */ 61 if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_LS_REQUEST)) 62 goto fail; 63 64 /* LSA header(s) */ 65 for (le = TAILQ_FIRST(&nbr->ls_req_list); le != NULL && 66 buf->wpos + sizeof(struct ls_req_hdr) < buf->max; le = nle) { 67 nbr->ls_req = nle = TAILQ_NEXT(le, entry); 68 ls_req_hdr.zero = 0; 69 ls_req_hdr.type = le->le_lsa->type; 70 ls_req_hdr.ls_id = le->le_lsa->ls_id; 71 ls_req_hdr.adv_rtr = le->le_lsa->adv_rtr; 72 if (ibuf_add(buf, &ls_req_hdr, sizeof(ls_req_hdr))) 73 goto fail; 74 } 75 76 /* calculate checksum */ 77 if (upd_ospf_hdr(buf, nbr->iface)) 78 goto fail; 79 80 ret = send_packet(nbr->iface, buf->buf, buf->wpos, &dst); 81 82 ibuf_free(buf); 83 return (ret); 84 fail: 85 log_warn("send_ls_req"); 86 ibuf_free(buf); 87 return (-1); 88 } 89 90 void 91 recv_ls_req(struct nbr *nbr, char *buf, u_int16_t len) 92 { 93 switch (nbr->state) { 94 case NBR_STA_DOWN: 95 case NBR_STA_ATTEMPT: 96 case NBR_STA_INIT: 97 case NBR_STA_2_WAY: 98 case NBR_STA_XSTRT: 99 case NBR_STA_SNAP: 100 log_debug("recv_ls_req: packet ignored in state %s, " 101 "neighbor ID %s", nbr_state_name(nbr->state), 102 inet_ntoa(nbr->id)); 103 break; 104 case NBR_STA_XCHNG: 105 case NBR_STA_LOAD: 106 case NBR_STA_FULL: 107 imsg_compose_event(iev_rde, IMSG_LS_REQ, nbr->peerid, 108 0, -1, buf, len); 109 break; 110 default: 111 fatalx("recv_ls_req: unknown neighbor state"); 112 } 113 } 114 115 /* link state request list */ 116 void 117 ls_req_list_add(struct nbr *nbr, struct lsa_hdr *lsa) 118 { 119 struct lsa_entry *le; 120 121 if (lsa == NULL) 122 fatalx("ls_req_list_add: no LSA header"); 123 124 if ((le = calloc(1, sizeof(*le))) == NULL) 125 fatal("ls_req_list_add"); 126 127 TAILQ_INSERT_TAIL(&nbr->ls_req_list, le, entry); 128 le->le_lsa = lsa; 129 nbr->ls_req_cnt++; 130 } 131 132 struct lsa_entry * 133 ls_req_list_get(struct nbr *nbr, struct lsa_hdr *lsa_hdr) 134 { 135 struct lsa_entry *le; 136 137 TAILQ_FOREACH(le, &nbr->ls_req_list, entry) { 138 if ((lsa_hdr->type == le->le_lsa->type) && 139 (lsa_hdr->ls_id == le->le_lsa->ls_id) && 140 (lsa_hdr->adv_rtr == le->le_lsa->adv_rtr)) 141 return (le); 142 } 143 return (NULL); 144 } 145 146 void 147 ls_req_list_free(struct nbr *nbr, struct lsa_entry *le) 148 { 149 if (nbr->ls_req == le) { 150 nbr->ls_req = TAILQ_NEXT(le, entry); 151 } 152 153 TAILQ_REMOVE(&nbr->ls_req_list, le, entry); 154 free(le->le_lsa); 155 free(le); 156 nbr->ls_req_cnt--; 157 158 /* received all requested LSA(s), send a new LS req */ 159 if (nbr->ls_req != NULL && 160 nbr->ls_req == TAILQ_FIRST(&nbr->ls_req_list)) { 161 start_ls_req_tx_timer(nbr); 162 } 163 164 /* we might not have received all DDs and are still in XCHNG */ 165 if (ls_req_list_empty(nbr) && nbr->dd_pending == 0 && 166 nbr->state != NBR_STA_XCHNG) 167 nbr_fsm(nbr, NBR_EVT_LOAD_DONE); 168 } 169 170 void 171 ls_req_list_clr(struct nbr *nbr) 172 { 173 struct lsa_entry *le; 174 175 while ((le = TAILQ_FIRST(&nbr->ls_req_list)) != NULL) { 176 TAILQ_REMOVE(&nbr->ls_req_list, le, entry); 177 free(le->le_lsa); 178 free(le); 179 } 180 181 nbr->ls_req_cnt = 0; 182 nbr->ls_req = NULL; 183 } 184 185 int 186 ls_req_list_empty(struct nbr *nbr) 187 { 188 return (TAILQ_EMPTY(&nbr->ls_req_list)); 189 } 190 191 /* timers */ 192 /* ARGSUSED */ 193 void 194 ls_req_tx_timer(int fd, short event, void *arg) 195 { 196 struct nbr *nbr = arg; 197 struct timeval tv; 198 199 switch (nbr->state) { 200 case NBR_STA_DOWN: 201 case NBR_STA_ATTEMPT: 202 case NBR_STA_INIT: 203 case NBR_STA_2_WAY: 204 case NBR_STA_SNAP: 205 case NBR_STA_XSTRT: 206 case NBR_STA_XCHNG: 207 return; 208 case NBR_STA_LOAD: 209 send_ls_req(nbr); 210 break; 211 case NBR_STA_FULL: 212 return; 213 default: 214 log_debug("ls_req_tx_timer: unknown neighbor state, " 215 "neighbor ID %s", inet_ntoa(nbr->id)); 216 break; 217 } 218 219 /* reschedule lsreq_tx_timer */ 220 if (nbr->state == NBR_STA_LOAD) { 221 timerclear(&tv); 222 tv.tv_sec = nbr->iface->rxmt_interval; 223 if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1) 224 fatal("ls_req_tx_timer"); 225 } 226 } 227 228 void 229 start_ls_req_tx_timer(struct nbr *nbr) 230 { 231 struct timeval tv; 232 233 if (nbr == nbr->iface->self) 234 return; 235 236 timerclear(&tv); 237 if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1) 238 fatal("start_ls_req_tx_timer"); 239 } 240 241 void 242 stop_ls_req_tx_timer(struct nbr *nbr) 243 { 244 if (nbr == nbr->iface->self) 245 return; 246 247 if (evtimer_del(&nbr->lsreq_tx_timer) == -1) 248 fatal("stop_ls_req_tx_timer"); 249 } 250