summaryrefslogtreecommitdiffstats
path: root/proto/static/static.c
blob: f34996bde49ce19b40681748dd8338b9c9f1ad3b (plain)
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
/*
 *	BIRD -- Static Route Generator
 *
 *	(c) 1998--1999 Martin Mares <mj@ucw.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL.
 */

#define LOCAL_DEBUG

#include <string.h>

#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/protocol.h"
#include "nest/route.h"
#include "conf/conf.h"

#include "static.h"

static void
static_install(struct proto *p, struct static_route *r, struct iface *ifa)
{
  net *n;
  rta a, *aa;
  rte *e;

  DBG("Installing static route %I/%d, rtd=%d\n", r->net, r->masklen, r->dest);
  bzero(&a, sizeof(a));
  a.proto = p;
  a.source = (r->dest == RTD_DEVICE) ? RTS_STATIC_DEVICE : RTS_STATIC;
  a.scope = SCOPE_UNIVERSE;
  a.cast = RTC_UNICAST;
  a.dest = r->dest;
  a.tos = 0;
  a.gw = r->via;
  a.iface = ifa;
  aa = rta_lookup(&a);

  n = net_get(&master_table, a.tos, r->net, r->masklen);
  e = rte_get_temp(aa);
  e->net = n;
  e->pflags = 0;
  rte_update(n, p, e);
}

static void
static_remove(struct proto *p, struct static_route *r)
{
  net *n;

  DBG("Removing static route %I/%d\n", r->net, r->masklen);
  n = net_find(&master_table, 0, r->net, r->masklen);
  if (n)
    rte_update(n, p, NULL);
}

static int
static_start(struct proto *p)
{
  struct static_config *c = (void *) p->cf;
  struct static_route *r;

  DBG("Static: take off!\n");
  WALK_LIST(r, c->other_routes)
    switch (r->dest)
      {
      case RTD_ROUTER:
	{
	  struct neighbor *n = neigh_find(p, &r->via, NEF_STICKY);
	  if (n)
	    {
	      r->chain = n->data;
	      n->data = r;
	      r->neigh = n;
	      static_install(p, r, n->iface);
	    }
	  else
	    log(L_ERR "Static route destination %I is invalid. Ignoring.\n", r->via);
	  break;
	}
      case RTD_DEVICE:
	bug("Static device routes are not supported");
	/* FIXME: Static device routes */
      default:
	static_install(p, r, NULL);
      }
  return PS_UP;
}

static void
static_neigh_notify(struct neighbor *n)
{
  struct proto *p = n->proto;
  struct static_route *r;

  DBG("Static: neighbor notify for %I: iface %p\n", n->addr, n->iface);
  for(r=n->data; r; r=r->chain)
    if (n->iface)
      static_install(p, r, n->iface);
    else
      static_remove(p, r);
}

static void
static_dump_rt(struct static_route *r)
{
  debug("%16I/%2d: ", r->net, r->masklen);
  switch (r->dest)
    {
    case RTD_ROUTER:
      debug("via %I\n", r->via);
      break;
    case RTD_DEVICE:
      debug("dev %s\n", r->if_name);
      break;
    default:
      debug("rtd %d\n", r->dest);
      break;
    }
}

static void
static_dump(struct proto *p)
{
  struct static_config *c = (void *) p->cf;
  struct static_route *r;

  debug("Independent static routes:\n");
  WALK_LIST(r, c->other_routes)
    static_dump_rt(r);
  debug("Device static routes:\n");
  WALK_LIST(r, c->iface_routes)
    static_dump_rt(r);
}

void
static_init_config(struct static_config *c)
{
  c->c.preference = DEF_PREF_STATIC;
  init_list(&c->iface_routes);
  init_list(&c->other_routes);
}

static struct proto *
static_init(struct proto_config *c)
{
  struct proto *p = proto_new(c, sizeof(struct proto));

  p->neigh_notify = static_neigh_notify;
  return p;
}

struct protocol proto_static = {
  name:		"Static",
  init:		static_init,
  dump:		static_dump,
  start:	static_start,
  /* FIXME: We'll need a shutdown function here */
};