1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/*
* BIRD -- OSPF
*
* (c) 2000--2004 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
void
ospf_lsreq_send(struct ospf_neighbor *n)
{
snode *sn;
struct top_hash_entry *en;
struct ospf_lsreq_packet *pk;
struct ospf_packet *op;
struct ospf_lsreq_header *lsh;
u16 length;
int i, j;
struct proto *p = &n->ifa->proto->proto;
pk = (struct ospf_lsreq_packet *) n->ifa->ip_sk->tbuf;
op = (struct ospf_packet *) n->ifa->ip_sk->tbuf;
fill_ospf_pkt_hdr(n->ifa, pk, LSREQ_P);
sn = SHEAD(n->lsrql);
if (EMPTY_SLIST(n->lsrql))
{
if (n->state == NEIGHBOR_LOADING)
ospf_neigh_sm(n, INM_LOADDONE);
return;
}
i = j = (n->ifa->iface->mtu - SIPH - sizeof(struct ospf_lsreq_packet)) /
sizeof(struct ospf_lsreq_header);
lsh = (struct ospf_lsreq_header *) (pk + 1);
for (; i > 0; i--)
{
en = (struct top_hash_entry *) sn;
lsh->padd1 = 0;
lsh->padd2 = 0;
lsh->type = en->lsa.type;
lsh->rt = htonl(en->lsa.rt);
lsh->id = htonl(en->lsa.id);
DBG("Requesting %uth LSA: Type: %u, Id: %I, RT: %I\n", i, en->lsa.type,
en->lsa.id, en->lsa.rt);
lsh++;
if (sn == STAIL(n->lsrql))
break;
sn = sn->next;
}
if (i != 0)
i--;
length =
sizeof(struct ospf_lsreq_packet) + (j -
i) * sizeof(struct ospf_lsreq_header);
op->length = htons(length);
ospf_pkt_finalize(n->ifa, op);
sk_send_to(n->ifa->ip_sk, length, n->ip, OSPF_PROTO);
OSPF_TRACE(D_PACKETS, "LS request sent to: %I", n->rid);
}
void
ospf_lsreq_receive(struct ospf_lsreq_packet *ps,
struct ospf_iface *ifa, u16 size)
{
u32 nrid;
struct ospf_neighbor *n;
struct ospf_lsreq_header *lsh;
struct l_lsr_head *llsh;
list uplist;
slab *upslab;
int length, i, lsano;
struct proto *p = (struct proto *) ifa->proto;
nrid = ntohl(ps->ospf_packet.routerid);
if ((n = find_neigh(ifa, nrid)) == NULL)
{
OSPF_TRACE(D_PACKETS, "Received lsreq from unknown neighbor! (%I)", nrid);
return;
}
if (n->state < NEIGHBOR_EXCHANGE)
return;
OSPF_TRACE(D_EVENTS, "Received LS req from neighbor: %I", n->ip);
ospf_neigh_sm(n, INM_HELLOREC);
length = ntohs(ps->ospf_packet.length);
lsh = (void *) (ps + 1);
init_list(&uplist);
upslab = sl_new(n->pool, sizeof(struct l_lsr_head));
lsano = (length - sizeof(struct ospf_lsreq_packet)) /
sizeof(struct ospf_lsreq_header);
for (i = 0; i < lsano; lsh++, i++)
{
DBG("Processing LSA: ID=%I, Type=%u, Router=%I\n", ntohl(lsh->id),
lsh->type, ntohl(lsh->rt));
llsh = sl_alloc(upslab);
llsh->lsh.id = ntohl(lsh->id);
llsh->lsh.rt = ntohl(lsh->rt);
llsh->lsh.type = lsh->type;
add_tail(&uplist, NODE llsh);
if (ospf_hash_find(n->ifa->oa->gr, llsh->lsh.id, llsh->lsh.rt,
llsh->lsh.type) == NULL)
{
log(L_WARN
"Received bad LS req from: %I looking: RT: %I, ID: %I, Type: %u",
n->ip, lsh->rt, lsh->id, lsh->type);
ospf_neigh_sm(n, INM_BADLSREQ);
rfree(upslab);
return;
}
}
ospf_lsupd_send_list(n, &uplist);
rfree(upslab);
}
|
