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
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
/*
* BIRD -- OSPF
*
* (c) 1999 Ondrej Filip <feela@network.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#include "ospf.h"
void
install_inactim(struct ospf_neighbor *n)
{
struct proto *p;
struct ospf_iface *ifa;
ifa=n->ifa;
p=(struct proto *)(ifa->proto);
if(n->inactim==NULL)
{
n->inactim=tm_new(p->pool);
n->inactim->data=n;
n->inactim->randomize=0;
n->inactim->hook=neighbor_timer_hook;
n->inactim->recurrent=0;
DBG("%s: Installing inactivity timer.\n", p->name);
}
}
void
restart_inactim(struct ospf_neighbor *n)
{
tm_start(n->inactim,n->ifa->deadc*n->ifa->helloint);
}
void
restart_hellotim(struct ospf_iface *ifa)
{
tm_start(ifa->hello_timer,ifa->helloint);
}
void
restart_waittim(struct ospf_iface *ifa)
{
tm_start(ifa->wait_timer,ifa->waitint);
}
void
ospf_hello_rx(struct ospf_hello_packet *ps, struct proto *p,
struct ospf_iface *ifa, int size, ip_addr faddr)
{
u32 nrid, *pnrid;
struct ospf_neighbor *neigh,*n;
u8 i,twoway,oldpriority;
u32 olddr,oldbdr;
char *beg=": Bad OSPF hello packet from ", *rec=" received: ";
nrid=ntohl(((struct ospf_packet *)ps)->routerid);
if((unsigned)ipa_mklen(ipa_ntoh(ps->netmask))!=ifa->iface->addr->pxlen)
{
log("%s%s%I%s%Ibad netmask %I.\n", p->name, beg, nrid, rec,
ipa_ntoh(ps->netmask));
return;
}
if(ntohs(ps->helloint)!=ifa->helloint)
{
log("%s%s%I%shello interval mismatch.\n", p->name, beg, nrid, rec);
return;
}
if(ntohl(ps->deadint)!=ifa->helloint*ifa->deadc)
{
log("%s%s%I%sdead interval mismatch.\n", p->name, beg, nrid, rec);
return;
}
if(ps->options!=ifa->options)
{
log("%s%s%I%soptions mismatch.\n", p->name, beg, nrid, rec);
return;
}
if((n=find_neigh(ifa, nrid))==NULL)
{
debug("%s: New neighbor found: %I.\n", p->name,nrid);
n=mb_allocz(p->pool, sizeof(struct ospf_neighbor));
add_tail(&ifa->neigh_list, NODE n);
n->rid=nrid;
n->ip=faddr;
n->dr=ntohl(ps->dr);
n->bdr=ntohl(ps->bdr);
n->priority=ps->priority;
n->options=ps->options;
n->ifa=ifa;
n->adj=0;
n->ldbdes=mb_alloc(p->pool, ifa->iface->mtu);
n->state=NEIGHBOR_DOWN;
install_inactim(n);
n->rxmt_timer=tm_new(p->pool);
n->rxmt_timer->data=n;
n->rxmt_timer->randomize=0;
n->rxmt_timer->hook=rxmt_timer_hook;
n->rxmt_timer->recurrent=ifa->rxmtint;
DBG("%s: Installing rxmt timer.\n", p->name);
n->lsrr_timer=tm_new(p->pool);
n->lsrr_timer->data=n;
n->lsrr_timer->randomize=0;
n->lsrr_timer->hook=lsrr_timer_hook;
n->lsrr_timer->recurrent=ifa->rxmtint;
DBG("%s: Installing lsrr timer.\n", p->name);
init_list(&n->ackl);
n->ackd_timer=tm_new(p->pool);
n->ackd_timer->data=n;
n->ackd_timer->randomize=0;
n->ackd_timer->hook=ackd_timer_hook;
n->ackd_timer->recurrent=ifa->rxmtint/2; /* FIXME use some config? */
DBG("%s: Installing ackd timer.\n", p->name);
}
ospf_neigh_sm(n, INM_HELLOREC);
pnrid=(u32 *)((struct ospf_hello_packet *)(ps+1));
twoway=0;
for(i=0;i<size-(sizeof(struct ospf_hello_packet));i++)
{
if(ntohl(*(pnrid+i))==p->cf->global->router_id)
{
DBG("%s: Twoway received from %I\n", p->name, nrid);
ospf_neigh_sm(n, INM_2WAYREC);
twoway=1;
break;
}
}
if(!twoway) ospf_neigh_sm(n, INM_1WAYREC);
olddr = n->dr;
n->dr = ntohl(ps->dr);
oldbdr = n->bdr;
n->bdr = ntohl(ps->bdr);
oldpriority = n->priority;
n->priority = ps->priority;
/* Check priority change */
if(n->state>=NEIGHBOR_2WAY)
{
if(n->priority!=oldpriority) ospf_int_sm(ifa, ISM_NEICH);
/* Router is declaring itself ad DR and there is no BDR */
if((n->rid==n->dr) && (n->bdr==0)) ospf_int_sm(ifa, ISM_BACKS);
/* Neighbor is declaring itself as BDR */
if(n->rid==n->bdr) ospf_int_sm(ifa, ISM_BACKS);
/* Neighbor is newly declaring itself as DR or BDR */
if(((n->rid==n->dr) && (n->dr!=olddr)) || ((n->rid==n->bdr) &&
(n->bdr!=oldbdr)))
ospf_int_sm(ifa, ISM_NEICH);
/* Neighbor is no more declaring itself as DR or BDR */
if(((n->rid==olddr) && (n->dr!=olddr)) || ((n->rid==oldbdr) &&
(n->bdr!=oldbdr)))
ospf_int_sm(ifa, ISM_NEICH);
}
ospf_neigh_sm(n, INM_HELLOREC);
}
void
hello_timer_hook(timer *timer)
{
struct ospf_iface *ifa;
struct ospf_hello_packet *pkt;
struct ospf_packet *op;
struct proto *p;
struct ospf_neighbor *neigh;
u16 length;
u32 *pp;
u8 i;
ifa=(struct ospf_iface *)timer->data;
p=(struct proto *)(ifa->proto);
debug("%s: Hello timer fired on interface %s.\n",
p->name, ifa->iface->name);
/* Now we should send a hello packet */
/* First a common packet header */
if(ifa->type!=OSPF_IT_NBMA)
{
/* Now fill ospf_hello header */
pkt=(struct ospf_hello_packet *)(ifa->hello_sk->tbuf);
op=(struct ospf_packet *)pkt;
fill_ospf_pkt_hdr(ifa, pkt, HELLO);
pkt->netmask=ipa_mkmask(ifa->iface->addr->pxlen);
ipa_hton(pkt->netmask);
pkt->helloint=ntohs(ifa->helloint);
pkt->options=ifa->options;
pkt->priority=ifa->priority;
pkt->deadint=htonl(ifa->deadc*ifa->helloint);
pkt->dr=htonl(ifa->drid);
pkt->bdr=htonl(ifa->bdrid);
/* Fill all neighbors */
i=0;
pp=(u32 *)(((u8 *)pkt)+sizeof(struct ospf_hello_packet));
WALK_LIST (neigh, ifa->neigh_list)
{
*(pp+i)=htonl(neigh->rid);
i++;
}
length=sizeof(struct ospf_hello_packet)+i*sizeof(u32);
op->length=htons(length);
ospf_pkt_finalize(ifa, op);
/* And finally send it :-) */
sk_send(ifa->hello_sk,length);
}
}
void
wait_timer_hook(timer *timer)
{
struct ospf_iface *ifa;
struct proto *p;
ifa=(struct ospf_iface *)timer->data;
p=(struct proto *)(ifa->proto);
debug("%s: Wait timer fired on interface %s.\n",
p->name, ifa->iface->name);
ospf_int_sm(ifa, ISM_WAITF);
}
/* Neighbor is inactive for a long time. Remove it. */
void
neighbor_timer_hook(timer *timer)
{
struct ospf_neighbor *n;
struct ospf_iface *ifa;
struct proto *p;
n=(struct ospf_neighbor *)timer->data;
ifa=n->ifa;
p=(struct proto *)(ifa->proto);
debug("%s: Inactivity timer fired on interface %s for neighbor %I.\n",
p->name, ifa->iface->name, n->rid);
tm_stop(n->inactim);
rfree(n->inactim);
rem_node(NODE n);
mb_free(n);
debug("%s: Deleting neigbor.\n", p->name);
/* FIXME: Go on */
}
|
