1 /* $OpenBSD: lsreq.c,v 1.7 2011/05/02 08:56:44 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 <arpa/inet.h> 23 #include <stdlib.h> 24 25 #include "ospf6d.h" 26 #include "ospf6.h" 27 #include "log.h" 28 #include "ospfe.h" 29 30 extern struct imsgev *iev_rde; 31 32 /* link state request packet handling */ 33 int 34 send_ls_req(struct nbr *nbr) 35 { 36 struct in6_addr dst; 37 struct ls_req_hdr ls_req_hdr; 38 struct lsa_entry *le, *nle; 39 struct ibuf *buf; 40 int ret; 41 42 if ((buf = ibuf_open(nbr->iface->mtu - sizeof(struct ip))) == NULL) 43 fatal("send_ls_req"); 44 45 switch (nbr->iface->type) { 46 case IF_TYPE_POINTOPOINT: 47 inet_pton(AF_INET6, AllSPFRouters, &dst); 48 break; 49 case IF_TYPE_BROADCAST: 50 case IF_TYPE_NBMA: 51 case IF_TYPE_POINTOMULTIPOINT: 52 case IF_TYPE_VIRTUALLINK: 53 dst = nbr->addr; 54 break; 55 default: 56 fatalx("send_ls_req: unknown interface type"); 57 } 58 59 /* OSPF header */ 60 if (gen_ospf_hdr(buf, nbr->iface, PACKET_TYPE_LS_REQUEST)) 61 goto fail; 62 63 /* LSA header(s) */ 64 for (le = TAILQ_FIRST(&nbr->ls_req_list); le != NULL && 65 buf->wpos + sizeof(struct ls_req_hdr) < buf->max; le = nle) { 66 nbr->ls_req = nle = TAILQ_NEXT(le, entry); 67 ls_req_hdr.zero = 0; 68 ls_req_hdr.type = le->le_lsa->type; 69 ls_req_hdr.ls_id = le->le_lsa->ls_id; 70 ls_req_hdr.adv_rtr = le->le_lsa->adv_rtr; 71 if (ibuf_add(buf, &ls_req_hdr, sizeof(ls_req_hdr))) 72 goto fail; 73 } 74 75 /* calculate checksum */ 76 if (upd_ospf_hdr(buf, nbr->iface)) 77 goto fail; 78 79 ret = send_packet(nbr->iface, buf->buf, buf->wpos, &dst); 80 81 ibuf_free(buf); 82 return (ret); 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", nbr_state_name(nbr->state), 101 inet_ntoa(nbr->id)); 102 break; 103 case NBR_STA_XCHNG: 104 case NBR_STA_LOAD: 105 case NBR_STA_FULL: 106 imsg_compose_event(iev_rde, IMSG_LS_REQ, nbr->peerid, 107 0, -1, buf, len); 108 break; 109 default: 110 fatalx("recv_ls_req: unknown neighbor state"); 111 } 112 } 113 114 /* link state request list */ 115 void 116 ls_req_list_add(struct nbr *nbr, struct lsa_hdr *lsa) 117 { 118 struct lsa_entry *le; 119 120 if (lsa == NULL) 121 fatalx("ls_req_list_add: no LSA header"); 122 123 if ((le = calloc(1, sizeof(*le))) == NULL) 124 fatal("ls_req_list_add"); 125 126 TAILQ_INSERT_TAIL(&nbr->ls_req_list, le, entry); 127 le->le_lsa = lsa; 128 nbr->ls_req_cnt++; 129 } 130 131 struct lsa_entry * 132 ls_req_list_get(struct nbr *nbr, struct lsa_hdr *lsa_hdr) 133 { 134 struct lsa_entry *le; 135 136 TAILQ_FOREACH(le, &nbr->ls_req_list, entry) { 137 if ((lsa_hdr->type == le->le_lsa->type) && 138 (lsa_hdr->ls_id == le->le_lsa->ls_id) && 139 (lsa_hdr->adv_rtr == le->le_lsa->adv_rtr)) 140 return (le); 141 } 142 return (NULL); 143 } 144 145 void 146 ls_req_list_free(struct nbr *nbr, struct lsa_entry *le) 147 { 148 if (nbr->ls_req == le) { 149 nbr->ls_req = TAILQ_NEXT(le, entry); 150 } 151 152 TAILQ_REMOVE(&nbr->ls_req_list, le, entry); 153 free(le->le_lsa); 154 free(le); 155 nbr->ls_req_cnt--; 156 157 /* received all requested LSA(s), send a new LS req */ 158 if (nbr->ls_req != NULL && 159 nbr->ls_req == TAILQ_FIRST(&nbr->ls_req_list)) { 160 start_ls_req_tx_timer(nbr); 161 } 162 163 if (ls_req_list_empty(nbr) && nbr->dd_pending == 0) 164 nbr_fsm(nbr, NBR_EVT_LOAD_DONE); 165 } 166 167 void 168 ls_req_list_clr(struct nbr *nbr) 169 { 170 struct lsa_entry *le; 171 172 while ((le = TAILQ_FIRST(&nbr->ls_req_list)) != NULL) { 173 TAILQ_REMOVE(&nbr->ls_req_list, le, entry); 174 free(le->le_lsa); 175 free(le); 176 } 177 178 nbr->ls_req_cnt = 0; 179 nbr->ls_req = NULL; 180 } 181 182 int 183 ls_req_list_empty(struct nbr *nbr) 184 { 185 return (TAILQ_EMPTY(&nbr->ls_req_list)); 186 } 187 188 /* timers */ 189 /* ARGSUSED */ 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", inet_ntoa(nbr->id)); 213 break; 214 } 215 216 /* reschedule lsreq_tx_timer */ 217 if (nbr->state == NBR_STA_LOAD) { 218 timerclear(&tv); 219 tv.tv_sec = nbr->iface->rxmt_interval; 220 if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1) 221 fatal("ls_req_tx_timer"); 222 } 223 } 224 225 void 226 start_ls_req_tx_timer(struct nbr *nbr) 227 { 228 struct timeval tv; 229 230 if (nbr == nbr->iface->self) 231 return; 232 233 timerclear(&tv); 234 if (evtimer_add(&nbr->lsreq_tx_timer, &tv) == -1) 235 fatal("start_ls_req_tx_timer"); 236 } 237 238 void 239 stop_ls_req_tx_timer(struct nbr *nbr) 240 { 241 if (nbr == nbr->iface->self) 242 return; 243 244 if (evtimer_del(&nbr->lsreq_tx_timer) == -1) 245 fatal("stop_ls_req_tx_timer"); 246 } 247