Annotation of embedaddon/bird2/nest/rt-dev.c, revision 1.1.1.1
1.1 misho 1: /*
2: * BIRD -- Direct Device Routes
3: *
4: * (c) 1998--2000 Martin Mares <mj@ucw.cz>
5: *
6: * Can be freely distributed and used under the terms of the GNU GPL.
7: */
8:
9: /**
10: * DOC: Direct
11: *
12: * The Direct protocol works by converting all ifa_notify() events it receives
13: * to rte_update() calls for the corresponding network.
14: */
15:
16: #undef LOCAL_DEBUG
17:
18: #include "nest/bird.h"
19: #include "nest/iface.h"
20: #include "nest/protocol.h"
21: #include "nest/route.h"
22: #include "nest/rt-dev.h"
23: #include "conf/conf.h"
24: #include "lib/resource.h"
25: #include "lib/string.h"
26:
27:
28: static void
29: dev_ifa_notify(struct proto *P, uint flags, struct ifa *ad)
30: {
31: struct rt_dev_proto *p = (void *) P;
32: struct rt_dev_config *cf = (void *) P->cf;
33: struct channel *c;
34: net_addr *net = &ad->prefix;
35:
36: if (!EMPTY_LIST(cf->iface_list) &&
37: !iface_patt_find(&cf->iface_list, ad->iface, ad))
38: /* Empty list is automatically treated as "*" */
39: return;
40:
41: if (ad->flags & IA_SECONDARY)
42: return;
43:
44: if (ad->scope <= SCOPE_LINK)
45: return;
46:
47: if (ad->prefix.type == NET_IP4)
48: c = p->ip4_channel;
49: else if (ad->prefix.type == NET_IP6)
50: c = p->ip6_channel;
51: else
52: return;
53:
54: if (!c)
55: return;
56:
57: /* For IPv6 SADR, replace regular prefix with SADR prefix */
58: if (c->net_type == NET_IP6_SADR)
59: {
60: net = alloca(sizeof(net_addr_ip6_sadr));
61: net_fill_ip6_sadr(net, net6_prefix(&ad->prefix), net6_pxlen(&ad->prefix), IP6_NONE, 0);
62: }
63:
64: if (flags & IF_CHANGE_DOWN)
65: {
66: DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
67:
68: /* Use iface ID as local source ID */
69: struct rte_src *src = rt_get_source(P, ad->iface->index);
70: rte_update2(c, net, NULL, src);
71: }
72: else if (flags & IF_CHANGE_UP)
73: {
74: rta *a;
75: rte *e;
76:
77: DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
78:
79: if (cf->check_link && !(ad->iface->flags & IF_LINK_UP))
80: return;
81:
82: /* Use iface ID as local source ID */
83: struct rte_src *src = rt_get_source(P, ad->iface->index);
84:
85: rta a0 = {
86: .src = src,
87: .source = RTS_DEVICE,
88: .scope = SCOPE_UNIVERSE,
89: .dest = RTD_UNICAST,
90: .nh.iface = ad->iface,
91: };
92:
93: a = rta_lookup(&a0);
94: e = rte_get_temp(a);
95: e->pflags = 0;
96: rte_update2(c, net, e, src);
97: }
98: }
99:
100: static void
101: dev_if_notify(struct proto *p, uint c, struct iface *iface)
102: {
103: struct rt_dev_config *cf = (void *) p->cf;
104:
105: if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))
106: return;
107:
108: if ((c & IF_CHANGE_LINK) && cf->check_link)
109: {
110: uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;
111:
112: struct ifa *a;
113: WALK_LIST(a, iface->addrs)
114: dev_ifa_notify(p, ac, a);
115: }
116: }
117:
118: static void
119: dev_postconfig(struct proto_config *CF)
120: {
121: struct rt_dev_config *cf = (void *) CF;
122: struct channel_config *ip4, *ip6, *ip6_sadr;
123:
124: ip4 = proto_cf_find_channel(CF, NET_IP4);
125: ip6 = proto_cf_find_channel(CF, NET_IP6);
126: ip6_sadr = proto_cf_find_channel(CF, NET_IP6_SADR);
127:
128: if (ip6 && ip6_sadr)
129: cf_error("Both ipv6 and ipv6-sadr channels");
130:
131: cf->ip4_channel = ip4;
132: cf->ip6_channel = ip6 ?: ip6_sadr;
133: }
134:
135: static struct proto *
136: dev_init(struct proto_config *CF)
137: {
138: struct proto *P = proto_new(CF);
139: struct rt_dev_proto *p = (void *) P;
140: struct rt_dev_config *cf = (void *) CF;
141:
142: proto_configure_channel(P, &p->ip4_channel, cf->ip4_channel);
143: proto_configure_channel(P, &p->ip6_channel, cf->ip6_channel);
144:
145: P->if_notify = dev_if_notify;
146: P->ifa_notify = dev_ifa_notify;
147:
148: return P;
149: }
150:
151: static int
152: dev_reconfigure(struct proto *P, struct proto_config *CF)
153: {
154: struct rt_dev_proto *p = (void *) P;
155: struct rt_dev_config *o = (void *) P->cf;
156: struct rt_dev_config *n = (void *) CF;
157:
158: if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||
159: (o->check_link != n->check_link))
160: return 0;
161:
162: return
163: proto_configure_channel(P, &p->ip4_channel, n->ip4_channel) &&
164: proto_configure_channel(P, &p->ip6_channel, n->ip6_channel);
165:
166: return 1;
167: }
168:
169: static void
170: dev_copy_config(struct proto_config *dest, struct proto_config *src)
171: {
172: struct rt_dev_config *d = (void *) dest;
173: struct rt_dev_config *s = (void *) src;
174:
175: /*
176: * We copy iface_list as ifaces can be shared by more direct protocols.
177: * Copy suffices to be is shallow, because new nodes can be added, but
178: * old nodes cannot be modified (although they contain internal lists).
179: */
180: cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
181:
182: d->check_link = s->check_link;
183: }
184:
185: struct protocol proto_device = {
186: .name = "Direct",
187: .template = "direct%d",
188: .class = PROTOCOL_DIRECT,
189: .preference = DEF_PREF_DIRECT,
190: .channel_mask = NB_IP | NB_IP6_SADR,
191: .proto_size = sizeof(struct rt_dev_proto),
192: .config_size = sizeof(struct rt_dev_config),
193: .postconfig = dev_postconfig,
194: .init = dev_init,
195: .reconfigure = dev_reconfigure,
196: .copy_config = dev_copy_config
197: };
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