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/*
* BIRD -- Direct Device Routes
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
/**
* DOC: Direct
*
* The Direct protocol works by converting all ifa_notify() events it receives
* to rte_update() calls for the corresponding network.
*/
#undef LOCAL_DEBUG
#include "nest/bird.h"
#include "nest/iface.h"
#include "nest/protocol.h"
#include "nest/rt.h"
#include "nest/rt-dev.h"
#include "conf/conf.h"
#include "lib/resource.h"
#include "lib/string.h"
static void
dev_ifa_notify(struct proto *P, uint flags, struct ifa *ad)
{
struct rt_dev_proto *p = (void *) P;
struct rt_dev_config *cf = (void *) P->cf;
struct channel *c;
net_addr *net = &ad->prefix;
if (!EMPTY_LIST(cf->iface_list) &&
!iface_patt_find(&cf->iface_list, ad->iface, ad))
/* Empty list is automatically treated as "*" */
return;
if (ad->flags & IA_SECONDARY)
return;
if (ad->scope <= SCOPE_LINK)
return;
if (ad->prefix.type == NET_IP4)
c = p->ip4_channel;
else if (ad->prefix.type == NET_IP6)
c = p->ip6_channel;
else
return;
if (!c)
return;
/* For IPv6 SADR, replace regular prefix with SADR prefix */
if (c->net_type == NET_IP6_SADR)
{
net = alloca(sizeof(net_addr_ip6_sadr));
net_fill_ip6_sadr(net, net6_prefix(&ad->prefix), net6_pxlen(&ad->prefix), IP6_NONE, 0);
}
if (flags & IF_CHANGE_DOWN)
{
DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
/* Use iface ID as local source ID */
struct rte_src *src = rt_get_source(P, ad->iface->index);
rte_update(c, net, NULL, src);
rt_unlock_source(src);
}
else if (flags & IF_CHANGE_UP)
{
DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
if (cf->check_link && !(ad->iface->flags & IF_LINK_UP))
return;
/* Use iface ID as local source ID */
struct rte_src *src = rt_get_source(P, ad->iface->index);
ea_list *ea = NULL;
struct nexthop_adata nhad = {
.nh = { .iface = ad->iface, },
.ad = { .length = (void *) NEXTHOP_NEXT(&nhad.nh) - (void *) nhad.ad.data, },
};
ea_set_attr_u32(&ea, &ea_gen_preference, 0, c->preference);
ea_set_attr_u32(&ea, &ea_gen_source, 0, RTS_DEVICE);
ea_set_attr_data(&ea, &ea_gen_nexthop, 0, nhad.ad.data, nhad.ad.length);
rte e0 = {
.attrs = ea,
.src = src,
};
rte_update(c, net, &e0, src);
rt_unlock_source(src);
}
}
static void
dev_if_notify(struct proto *p, uint c, struct iface *iface)
{
struct rt_dev_config *cf = (void *) p->cf;
if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))
return;
if ((c & IF_CHANGE_LINK) && cf->check_link)
{
uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;
struct ifa *a;
WALK_LIST(a, iface->addrs)
dev_ifa_notify(p, ac, a);
}
}
static void
dev_postconfig(struct proto_config *CF)
{
struct rt_dev_config *cf = (void *) CF;
struct channel_config *ip4, *ip6, *ip6_sadr;
ip4 = proto_cf_find_channel(CF, NET_IP4);
ip6 = proto_cf_find_channel(CF, NET_IP6);
ip6_sadr = proto_cf_find_channel(CF, NET_IP6_SADR);
if (ip6 && ip6_sadr)
cf_error("Both ipv6 and ipv6-sadr channels");
cf->ip4_channel = ip4;
cf->ip6_channel = ip6 ?: ip6_sadr;
}
static struct proto *
dev_init(struct proto_config *CF)
{
struct proto *P = proto_new(CF);
struct rt_dev_proto *p = (void *) P;
struct rt_dev_config *cf = (void *) CF;
proto_configure_channel(P, &p->ip4_channel, cf->ip4_channel);
proto_configure_channel(P, &p->ip6_channel, cf->ip6_channel);
P->iface_sub.if_notify = dev_if_notify;
P->iface_sub.ifa_notify = dev_ifa_notify;
return P;
}
static int
dev_reconfigure(struct proto *P, struct proto_config *CF)
{
struct rt_dev_proto *p = (void *) P;
struct rt_dev_config *o = (void *) P->cf;
struct rt_dev_config *n = (void *) CF;
if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||
(o->check_link != n->check_link))
return 0;
return
proto_configure_channel(P, &p->ip4_channel, n->ip4_channel) &&
proto_configure_channel(P, &p->ip6_channel, n->ip6_channel);
return 1;
}
static void
dev_copy_config(struct proto_config *dest, struct proto_config *src)
{
struct rt_dev_config *d = (void *) dest;
struct rt_dev_config *s = (void *) src;
/*
* We copy iface_list as ifaces can be shared by more direct protocols.
* Copy suffices to be is shallow, because new nodes can be added, but
* old nodes cannot be modified (although they contain internal lists).
*/
cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
d->check_link = s->check_link;
}
struct protocol proto_device = {
.name = "Direct",
.template = "direct%d",
.preference = DEF_PREF_DIRECT,
.channel_mask = NB_IP | NB_IP6_SADR,
.proto_size = sizeof(struct rt_dev_proto),
.config_size = sizeof(struct rt_dev_config),
.postconfig = dev_postconfig,
.init = dev_init,
.reconfigure = dev_reconfigure,
.copy_config = dev_copy_config
};
void
dev_build(void)
{
proto_build(&proto_device);
}
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