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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
/*
* 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"
struct ospf_lsack_packet
{
struct ospf_packet ospf_packet;
struct ospf_lsa_header lsh[];
};
char *s_queue[] = { "direct", "delayed" };
static void ospf_dump_lsack(struct proto *p, struct ospf_lsack_packet *pkt)
{
struct ospf_packet *op = &pkt->ospf_packet;
ASSERT(op->type == LSACK_P);
ospf_dump_common(p, op);
unsigned int i, j;
j = (ntohs(op->length) - sizeof(struct ospf_lsack_packet)) /
sizeof(struct ospf_lsa_header);
for (i = 0; i < j; i++)
ospf_dump_lsahdr(p, pkt->lsh + i);
}
/*
* =====================================
* Note, that h is in network endianity!
* =====================================
*/
void
ospf_lsack_enqueue(struct ospf_neighbor *n, struct ospf_lsa_header *h,
int queue)
{
struct lsah_n *no = mb_alloc(n->pool, sizeof(struct lsah_n));
memcpy(&no->lsa, h, sizeof(struct ospf_lsa_header));
add_tail(&n->ackl[queue], NODE no);
DBG("Adding (%s) ack for %R, ID: %R, RT: %R, Type: %u\n", s_queue[queue],
n->rid, ntohl(h->id), ntohl(h->rt), h->type);
}
void
ospf_lsack_send(struct ospf_neighbor *n, int queue)
{
struct ospf_packet *op;
struct ospf_lsack_packet *pk;
u16 len, i = 0;
struct ospf_lsa_header *h;
struct lsah_n *no;
struct ospf_iface *ifa = n->ifa;
struct proto *p = &n->ifa->oa->po->proto;
if (EMPTY_LIST(n->ackl[queue]))
return;
pk = (struct ospf_lsack_packet *) ifa->sk->tbuf;
op = (struct ospf_packet *) ifa->sk->tbuf;
ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
h = pk->lsh;
while (!EMPTY_LIST(n->ackl[queue]))
{
no = (struct lsah_n *) HEAD(n->ackl[queue]);
memcpy(h + i, &no->lsa, sizeof(struct ospf_lsa_header));
DBG("Iter %u ID: %R, RT: %R, Type: %04x\n", i, ntohl((h + i)->id),
ntohl((h + i)->rt), (h + i)->type);
i++;
rem_node(NODE no);
mb_free(no);
if ((i * sizeof(struct ospf_lsa_header) +
sizeof(struct ospf_lsack_packet)) > ospf_pkt_maxsize(n->ifa))
{
if (!EMPTY_LIST(n->ackl[queue]))
{
len =
sizeof(struct ospf_lsack_packet) +
i * sizeof(struct ospf_lsa_header);
op->length = htons(len);
DBG("Sending and continuing! Len=%u\n", len);
OSPF_PACKET(ospf_dump_lsack, (struct ospf_lsack_packet *) ifa->sk->tbuf,
"LSACK packet sent via %s", ifa->iface->name);
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to(ifa, AllSPFRouters);
else
ospf_send_to(ifa, AllDRouters);
}
else
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to_agt(ifa, NEIGHBOR_EXCHANGE);
else
ospf_send_to_bdr(ifa);
}
ospf_pkt_fill_hdr(n->ifa, pk, LSACK_P);
i = 0;
}
}
}
len = sizeof(struct ospf_lsack_packet) + i * sizeof(struct ospf_lsa_header);
op->length = htons(len);
DBG("Sending! Len=%u\n", len);
OSPF_PACKET(ospf_dump_lsack, (struct ospf_lsack_packet *) ifa->sk->tbuf,
"LSACK packet sent via %s", ifa->iface->name);
if (ifa->type == OSPF_IT_BCAST)
{
if ((ifa->state == OSPF_IS_DR) || (ifa->state == OSPF_IS_BACKUP))
ospf_send_to(ifa, AllSPFRouters);
else
ospf_send_to(ifa, AllDRouters);
}
else
ospf_send_to_agt(ifa, NEIGHBOR_EXCHANGE);
}
void
ospf_lsack_receive(struct ospf_packet *ps_i, struct ospf_iface *ifa,
struct ospf_neighbor *n)
{
struct proto *p = &ifa->oa->po->proto;
struct ospf_lsa_header lsa;
struct top_hash_entry *en;
unsigned int i, lsano;
unsigned int size = ntohs(ps_i->length);
if (size < sizeof(struct ospf_lsack_packet))
{
log(L_ERR "Bad OSPF LSACK packet from %I - too short (%u B)", n->ip, size);
return;
}
struct ospf_lsack_packet *ps = (void *) ps_i;
OSPF_PACKET(ospf_dump_lsack, ps, "LSACK packet received from %I via %s", n->ip, ifa->iface->name);
ospf_neigh_sm(n, INM_HELLOREC);
if (n->state < NEIGHBOR_EXCHANGE)
return;
lsano = (size - sizeof(struct ospf_lsack_packet)) /
sizeof(struct ospf_lsa_header);
for (i = 0; i < lsano; i++)
{
ntohlsah(ps->lsh + i, &lsa);
u32 dom = ospf_lsa_domain(lsa.type, n->ifa);
if ((en = ospf_hash_find_header(n->lsrth, dom, &lsa)) == NULL)
continue; /* pg 155 */
if (lsa_comp(&lsa, &en->lsa) != CMP_SAME) /* pg 156 */
{
if ((lsa.sn == LSA_MAXSEQNO) && (lsa.age == LSA_MAXAGE))
continue;
OSPF_TRACE(D_PACKETS, "Strange LS acknoledgement from %I", n->ip);
OSPF_TRACE(D_PACKETS, "Id: %R, Rt: %R, Type: 0x%04x",
lsa.id, lsa.rt, lsa.type);
OSPF_TRACE(D_PACKETS, "I have: Age: %4u, Seqno: 0x%08x, Sum: 0x%04x",
en->lsa.age, en->lsa.sn, en->lsa.checksum);
OSPF_TRACE(D_PACKETS, "He has: Age: %4u, Seqno: 0x%08x, Sum: 0x%04x",
lsa.age, lsa.sn, lsa.checksum);
continue;
}
DBG("Deleting LS Id: %R RT: %R Type: %u from LS Retl for neighbor %R\n",
lsa.id, lsa.rt, lsa.type, n->rid);
s_rem_node(SNODE en);
if (en->lsa_body != NULL)
mb_free(en->lsa_body);
en->lsa_body = NULL;
ospf_hash_delete(n->lsrth, en);
}
}
|
