mirror of
https://gitlab.nic.cz/labs/bird.git
synced 2024-09-07 22:15:19 +00:00
There were some confusion about validity and usage of pflags, which caused incorrect usage after some flags from (now removed) protocol- specific area were moved to pflags. We state that pflags: - Are secondary data used by protocol-specific hooks - Can be changed on an existing route (in contrast to copy-on-write for primary data) - Are irrelevant for propagation (not propagated when changed) - Are specific to a routing table (not propagated by pipe) The patch did these fixes: - Do not compare pflags in rte_same(), as they may keep cached values like BGP_REF_STALE, causing spurious propagation. - Initialize pflags to zero in rte_get_temp(), avoid initialization in protocol code, fixing at least two forgotten initializations (krt and one case in babel). - Improve documentation about pflags
203 lines
4.8 KiB
C
203 lines
4.8 KiB
C
/*
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* BIRD -- Direct Device Routes
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*
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* (c) 1998--2000 Martin Mares <mj@ucw.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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/**
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* DOC: Direct
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*
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* The Direct protocol works by converting all ifa_notify() events it receives
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* to rte_update() calls for the corresponding network.
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*/
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#undef LOCAL_DEBUG
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#include "nest/bird.h"
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#include "nest/iface.h"
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#include "nest/protocol.h"
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#include "nest/route.h"
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#include "nest/rt-dev.h"
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#include "conf/conf.h"
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#include "lib/resource.h"
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#include "lib/string.h"
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static void
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dev_ifa_notify(struct proto *P, uint flags, struct ifa *ad)
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{
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struct rt_dev_proto *p = (void *) P;
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struct rt_dev_config *cf = (void *) P->cf;
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struct channel *c;
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net_addr *net = &ad->prefix;
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if (!EMPTY_LIST(cf->iface_list) &&
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!iface_patt_find(&cf->iface_list, ad->iface, ad))
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/* Empty list is automatically treated as "*" */
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return;
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if (ad->flags & IA_SECONDARY)
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return;
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if (ad->scope <= SCOPE_LINK)
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return;
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if (ad->prefix.type == NET_IP4)
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c = p->ip4_channel;
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else if (ad->prefix.type == NET_IP6)
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c = p->ip6_channel;
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else
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return;
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if (!c)
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return;
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/* For IPv6 SADR, replace regular prefix with SADR prefix */
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if (c->net_type == NET_IP6_SADR)
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{
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net = alloca(sizeof(net_addr_ip6_sadr));
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net_fill_ip6_sadr(net, net6_prefix(&ad->prefix), net6_pxlen(&ad->prefix), IP6_NONE, 0);
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}
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if (flags & IF_CHANGE_DOWN)
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{
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DBG("dev_if_notify: %s:%I going down\n", ad->iface->name, ad->ip);
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/* Use iface ID as local source ID */
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struct rte_src *src = rt_get_source(P, ad->iface->index);
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rte_update2(c, net, NULL, src);
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}
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else if (flags & IF_CHANGE_UP)
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{
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rta *a;
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rte *e;
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DBG("dev_if_notify: %s:%I going up\n", ad->iface->name, ad->ip);
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if (cf->check_link && !(ad->iface->flags & IF_LINK_UP))
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return;
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/* Use iface ID as local source ID */
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struct rte_src *src = rt_get_source(P, ad->iface->index);
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rta a0 = {
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.pref = c->preference,
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.source = RTS_DEVICE,
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.scope = SCOPE_UNIVERSE,
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.dest = RTD_UNICAST,
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.nh.iface = ad->iface,
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};
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a = rta_lookup(&a0);
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e = rte_get_temp(a, src);
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rte_update2(c, net, e, src);
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}
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}
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static void
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dev_if_notify(struct proto *p, uint c, struct iface *iface)
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{
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struct rt_dev_config *cf = (void *) p->cf;
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if (c & (IF_CHANGE_UP | IF_CHANGE_DOWN))
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return;
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if ((c & IF_CHANGE_LINK) && cf->check_link)
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{
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uint ac = (iface->flags & IF_LINK_UP) ? IF_CHANGE_UP : IF_CHANGE_DOWN;
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struct ifa *a;
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WALK_LIST(a, iface->addrs)
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dev_ifa_notify(p, ac, a);
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}
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}
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static void
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dev_postconfig(struct proto_config *CF)
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{
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struct rt_dev_config *cf = (void *) CF;
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struct channel_config *ip4, *ip6, *ip6_sadr;
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ip4 = proto_cf_find_channel(CF, NET_IP4);
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ip6 = proto_cf_find_channel(CF, NET_IP6);
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ip6_sadr = proto_cf_find_channel(CF, NET_IP6_SADR);
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if (ip6 && ip6_sadr)
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cf_error("Both ipv6 and ipv6-sadr channels");
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cf->ip4_channel = ip4;
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cf->ip6_channel = ip6 ?: ip6_sadr;
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}
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static struct proto *
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dev_init(struct proto_config *CF)
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{
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struct proto *P = proto_new(CF);
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struct rt_dev_proto *p = (void *) P;
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struct rt_dev_config *cf = (void *) CF;
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proto_configure_channel(P, &p->ip4_channel, cf->ip4_channel);
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proto_configure_channel(P, &p->ip6_channel, cf->ip6_channel);
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P->if_notify = dev_if_notify;
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P->ifa_notify = dev_ifa_notify;
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return P;
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}
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static int
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dev_reconfigure(struct proto *P, struct proto_config *CF)
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{
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struct rt_dev_proto *p = (void *) P;
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struct rt_dev_config *o = (void *) P->cf;
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struct rt_dev_config *n = (void *) CF;
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if (!iface_patts_equal(&o->iface_list, &n->iface_list, NULL) ||
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(o->check_link != n->check_link))
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return 0;
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return
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proto_configure_channel(P, &p->ip4_channel, n->ip4_channel) &&
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proto_configure_channel(P, &p->ip6_channel, n->ip6_channel);
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return 1;
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}
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static void
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dev_copy_config(struct proto_config *dest, struct proto_config *src)
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{
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struct rt_dev_config *d = (void *) dest;
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struct rt_dev_config *s = (void *) src;
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/*
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* We copy iface_list as ifaces can be shared by more direct protocols.
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* Copy suffices to be is shallow, because new nodes can be added, but
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* old nodes cannot be modified (although they contain internal lists).
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*/
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cfg_copy_list(&d->iface_list, &s->iface_list, sizeof(struct iface_patt));
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d->check_link = s->check_link;
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}
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struct protocol proto_device = {
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.name = "Direct",
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.template = "direct%d",
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.class = PROTOCOL_DIRECT,
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.preference = DEF_PREF_DIRECT,
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.channel_mask = NB_IP | NB_IP6_SADR,
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.proto_size = sizeof(struct rt_dev_proto),
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.config_size = sizeof(struct rt_dev_config),
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.postconfig = dev_postconfig,
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.init = dev_init,
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.reconfigure = dev_reconfigure,
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.copy_config = dev_copy_config
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};
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void
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dev_build(void)
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{
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proto_build(&proto_device);
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}
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