1 /*
2 * BIRD -- OSPF
3 *
4 * (c) 2000--2004 Ondrej Filip <feela@network.cz>
5 * (c) 2009--2014 Ondrej Zajicek <santiago@crfreenet.org>
6 * (c) 2009--2014 CZ.NIC z.s.p.o.
7 *
8 * Can be freely distributed and used under the terms of the GNU GPL.
9 */
10
11 #include "ospf.h"
12
13
14 /*
15 struct ospf_lsreq_packet
16 {
17 struct ospf_packet hdr;
18 // union ospf_auth auth;
19
20 struct ospf_lsreq_header lsrs[];
21 };
22 */
23
24
25 static inline void
ospf_lsreq_body(struct ospf_proto * p,struct ospf_packet * pkt,struct ospf_lsreq_header ** body,uint * count)26 ospf_lsreq_body(struct ospf_proto *p, struct ospf_packet *pkt,
27 struct ospf_lsreq_header **body, uint *count)
28 {
29 uint plen = ntohs(pkt->length);
30 uint hlen = ospf_pkt_hdrlen(p);
31
32 *body = ((void *) pkt) + hlen;
33 *count = (plen - hlen) / sizeof(struct ospf_lsreq_header);
34 }
35
36 static void
ospf_dump_lsreq(struct ospf_proto * p,struct ospf_packet * pkt)37 ospf_dump_lsreq(struct ospf_proto *p, struct ospf_packet *pkt)
38 {
39 struct ospf_lsreq_header *lsrs;
40 uint i, lsr_count;
41
42 ASSERT(pkt->type == LSREQ_P);
43 ospf_dump_common(p, pkt);
44
45 ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
46 for (i = 0; i < lsr_count; i++)
47 log(L_TRACE "%s: LSR Type: %04x, Id: %R, Rt: %R", p->p.name,
48 ntohl(lsrs[i].type), ntohl(lsrs[i].id), ntohl(lsrs[i].rt));
49 }
50
51
52 void
ospf_send_lsreq(struct ospf_proto * p,struct ospf_neighbor * n)53 ospf_send_lsreq(struct ospf_proto *p, struct ospf_neighbor *n)
54 {
55 struct ospf_iface *ifa = n->ifa;
56 struct ospf_lsreq_header *lsrs;
57 struct top_hash_entry *req;
58 struct ospf_packet *pkt;
59 uint i, lsr_max, length;
60
61 /* RFC 2328 10.9 */
62
63 /* ASSERT((n->state >= NEIGHBOR_EXCHANGE) && !EMPTY_SLIST(n->lsrql)); */
64
65 pkt = ospf_tx_buffer(ifa);
66 ospf_pkt_fill_hdr(ifa, pkt, LSREQ_P);
67 ospf_lsreq_body(p, pkt, &lsrs, &lsr_max);
68
69 i = 0;
70 WALK_SLIST(req, n->lsrql)
71 {
72 if (i == lsr_max)
73 break;
74
75 DBG("Requesting %uth LSA: Type: %04u, ID: %R, RT: %R, SN: 0x%x, Age %u\n",
76 i, req->lsa_type, req->lsa.id, req->lsa.rt, req->lsa.sn, req->lsa.age);
77
78 u32 etype = lsa_get_etype(&req->lsa, p);
79 lsrs[i].type = htonl(etype);
80 lsrs[i].rt = htonl(req->lsa.rt);
81 lsrs[i].id = htonl(req->lsa.id);
82 i++;
83 }
84
85 /* We store the position to see whether requested LSAs have been received */
86 n->lsrqi = req;
87
88 length = ospf_pkt_hdrlen(p) + i * sizeof(struct ospf_lsreq_header);
89 pkt->length = htons(length);
90
91 OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet sent to nbr %R on %s", n->rid, ifa->ifname);
92 ospf_send_to(ifa, n->ip);
93 }
94
95
96 void
ospf_receive_lsreq(struct ospf_packet * pkt,struct ospf_iface * ifa,struct ospf_neighbor * n)97 ospf_receive_lsreq(struct ospf_packet *pkt, struct ospf_iface *ifa,
98 struct ospf_neighbor *n)
99 {
100 struct ospf_proto *p = ifa->oa->po;
101 struct ospf_lsreq_header *lsrs;
102 uint i, lsr_count;
103
104 /* RFC 2328 10.7 */
105
106 /* No need to check length, lsreq has only basic header */
107
108 OSPF_PACKET(ospf_dump_lsreq, pkt, "LSREQ packet received from nbr %R on %s", n->rid, ifa->ifname);
109
110 if (n->state < NEIGHBOR_EXCHANGE)
111 {
112 OSPF_TRACE(D_PACKETS, "LSREQ packet ignored - lesser state than Exchange");
113 return;
114 }
115
116 ospf_neigh_sm(n, INM_HELLOREC); /* Not in RFC */
117
118 ospf_lsreq_body(p, pkt, &lsrs, &lsr_count);
119
120 struct top_hash_entry *en, *entries[lsr_count];
121
122 for (i = 0; i < lsr_count; i++)
123 {
124 u32 id, rt, type, domain;
125
126 id = ntohl(lsrs[i].id);
127 rt = ntohl(lsrs[i].rt);
128 lsa_get_type_domain_(ntohl(lsrs[i].type), ifa, &type, &domain);
129
130 DBG("Processing requested LSA: Type: %04x, Id: %R, Rt: %R\n", type, id, rt);
131
132 en = ospf_hash_find(p->gr, domain, id, rt, type);
133 if (!en)
134 {
135 LOG_LSA1("Bad LSR (Type: %04x, Id: %R, Rt: %R) in LSREQ", type, id, rt);
136 LOG_LSA2(" received from nbr %R on %s - LSA is missing", n->rid, ifa->ifname);
137
138 ospf_neigh_sm(n, INM_BADLSREQ);
139 return;
140 }
141
142 entries[i] = en;
143 }
144
145 ospf_send_lsupd(p, entries, lsr_count, n);
146 }
147