mirror of
https://gitlab.nic.cz/labs/bird.git
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- Rewrote whole interface logic. Removed support for multiple addresses per
interface since it makes much trouble everywhere. Instead, we understand secondary addresses as subinterfaces. - In case interface addresses or basic flags change, we simply convert it to a down/up sequence. - Implemented the universal neighbour cache. (Just forget what did previous includes say of neighbour caching, this one is brand new.)
This commit is contained in:
Martin Mares
parent
0fe3b28b68
commit
4cc78c5082
4
TODO
4
TODO
@ -1,15 +1,17 @@
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Core
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~~~~
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* router id
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- fake multipath?
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- config file: symbolic constants?
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- counters (according to SNMP MIB?)
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- generation of subnet mask ICMP's for v6?
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- neighbor cache: local broadcast address?
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- ipv4: recognize site scope addresses?
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- ifdef out some debugging code?
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- better memory allocators
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- default preferences of protocols: prefer BGP over OSPF/RIP external routes?
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- all internal tables are in host order
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- secondary addresses -> subinterfaces
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- filter: logging of dropped routes (?)
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- limitation of memory consumption: per-process and total (?)
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256
nest/iface.c
256
nest/iface.c
@ -1,24 +1,168 @@
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/*
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* BIRD -- Management of Interfaces
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* BIRD -- Management of Interfaces and Neighbor Cache
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*
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* (c) 1998 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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#define 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 "lib/resource.h"
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list iface_list;
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static pool *if_pool;
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/*
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* Neighbor Cache
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*
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* FIXME: Use hashing to get some real speed.
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* FIXME: Cleanup when a protocol goes down.
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*/
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static slab *neigh_slab;
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static list neigh_list;
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static int
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if_connected(ip_addr *a, struct iface *i) /* -1=error, 1=match, 0=no match */
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{
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if (i->flags & (IF_ADMIN_DOWN | IF_IGNORE))
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return 0;
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if ((i->flags & IF_UNNUMBERED) && ipa_equal(*a, i->opposite))
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return 1;
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if (!ipa_in_net(*a, i->prefix, i->pxlen))
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return 0;
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if (ipa_equal(*a, i->prefix) || /* Network address */
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ipa_equal(*a, i->brd) || /* Broadcast */
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ipa_equal(*a, i->ip)) /* Our own address */
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return -1;
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if (!(i->flags & IF_UP))
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return 0;
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return 1;
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}
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neighbor *
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neigh_find(struct proto *p, ip_addr *a, unsigned flags)
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{
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neighbor *n;
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int class;
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struct iface *i, *j;
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WALK_LIST(n, neigh_list)
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if (n->proto == p && ipa_equal(*a, n->addr))
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return n;
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class = ipa_classify(*a);
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if (class < 0) /* Invalid address */
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return NULL;
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if ((class & IADDR_SCOPE_MASK) < SCOPE_SITE ||
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!(class & IADDR_HOST))
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return NULL; /* Bad scope or a somecast */
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j = NULL;
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WALK_LIST(i, iface_list)
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switch (if_connected(a, i))
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{
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case -1:
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return NULL;
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case 1:
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if (!j || j->pxlen > i->pxlen)
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j = i;
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/* Fall-thru */
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}
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if (!j && !(flags & NEF_STICKY))
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return NULL;
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n = sl_alloc(neigh_slab);
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n->addr = *a;
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n->iface = j;
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add_tail(&neigh_list, &n->n);
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if (j)
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{
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n->sibling = j->neigh;
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j->neigh = n;
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}
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else
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n->sibling = NULL;
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n->proto = p;
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n->data = NULL;
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n->flags = flags;
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return n;
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}
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void
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neigh_dump(neighbor *n)
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{
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debug("%p %08x ", n, _I(n->addr));
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if (n->iface)
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debug("%s ", n->iface->name);
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else
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debug("[] ");
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debug("%s %p", n->proto->name, n->data);
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if (n->flags & NEF_STICKY)
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debug("STICKY");
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debug("\n");
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}
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void
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neigh_dump_all(void)
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{
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neighbor *n;
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debug("Known neighbors:\n");
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WALK_LIST(n, neigh_list)
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neigh_dump(n);
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debug("\n");
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}
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static void
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neigh_if_up(struct iface *i)
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{
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neighbor *n;
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WALK_LIST(n, neigh_list)
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if (!n->iface &&
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if_connected(&n->addr, i) > 0)
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{
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n->iface = i;
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n->sibling = i->neigh;
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i->neigh = n;
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DBG("Waking up sticky neighbor %08x\n", _I(n->addr));
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n->proto->neigh_notify(n);
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}
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}
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static void
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neigh_if_down(struct iface *i)
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{
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neighbor *n, *m;
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for(m=i->neigh; n = m;)
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{
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m = n->sibling;
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DBG("Flushing neighbor %08x on %s\n", _I(n->addr), n->iface->name);
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n->iface = NULL;
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n->proto->neigh_notify(n);
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if (!(n->flags & NEF_STICKY))
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{
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rem_node(&n->n);
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sl_free(neigh_slab, n);
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}
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i->neigh = NULL;
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}
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}
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/*
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* The Interface List
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*/
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list iface_list;
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void
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if_dump(struct iface *i)
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{
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struct ifa *a;
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debug("IF%d: %s", i->index, i->name);
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if (i->flags & IF_ADMIN_DOWN)
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debug(" ADMIN-DOWN");
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@ -39,8 +183,7 @@ if_dump(struct iface *i)
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if (i->flags & IF_IGNORE)
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debug(" IGN");
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debug(" MTU=%d\n", i->mtu);
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for(a=i->ifa; a; a=a->next)
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debug("\t%08x, net %08x/%-2d bc %08x -> %08x\n", _I(a->ip), _I(a->prefix), a->pxlen, _I(a->brd), _I(a->opposite));
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debug("\t%08x, net %08x/%-2d bc %08x -> %08x\n", _I(i->ip), _I(i->prefix), i->pxlen, _I(i->brd), _I(i->opposite));
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}
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void
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@ -54,64 +197,36 @@ if_dump_all(void)
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debug("\n");
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}
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struct if_with_a {
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struct iface i;
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struct ifa a[0];
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};
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static struct iface *
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if_copy(struct iface *j)
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static inline int
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if_change_too_big_p(struct iface *i, struct iface *j)
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{
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int len;
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struct if_with_a *w;
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struct iface *i;
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struct ifa *a, **b, *c;
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len = 0;
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for(a=j->ifa; a; a=a->next)
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len++;
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w = mb_alloc(if_pool, sizeof(struct if_with_a) + len*sizeof(struct ifa));
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i = &w->i;
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c = w->a;
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memcpy(i, j, sizeof(struct iface));
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b = &i->ifa;
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a = j->ifa;
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while (a)
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{
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*b = c;
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memcpy(c, a, sizeof(struct ifa));
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b = &c->next;
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a = a->next;
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c++;
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}
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*b = NULL;
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return i;
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if (!ipa_equal(i->ip, j->ip) ||
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!ipa_equal(i->prefix, j->prefix) ||
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i->pxlen != j->pxlen ||
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!ipa_equal(i->brd, j->brd) ||
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!ipa_equal(i->opposite, j->opposite))
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return 1; /* Changed addresses */
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if ((i->flags ^ j->flags) & ~(IF_UP | IF_ADMIN_DOWN | IF_UPDATED))
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return 1;
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return 0;
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}
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static inline void
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if_free(struct iface *i)
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if_copy(struct iface *to, struct iface *from)
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{
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mb_free(i);
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to->flags = from->flags;
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to->mtu = from->mtu;
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to->index = from->index;
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}
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static unsigned
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if_changed(struct iface *i, struct iface *j)
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{
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unsigned f = 0;
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struct ifa *x, *y;
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x = i->ifa;
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y = j->ifa;
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while (x && y)
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{
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x = x->next;
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y = y->next;
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}
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if (x || y)
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f |= IF_CHANGE_ADDR;
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if (i->mtu != j->mtu)
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f |= IF_CHANGE_MTU;
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if (i->flags != j->flags)
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if ((i->flags ^ j->flags) & ~IF_UPDATED)
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{
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f |= IF_CHANGE_FLAGS;
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if ((i->flags ^ j->flags) & IF_UP)
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@ -127,30 +242,51 @@ static void
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if_notify_change(unsigned c, struct iface *old, struct iface *new)
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{
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debug("Interface change notification (%x) for %s\n", c, new->name);
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if (old)
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if_dump(old);
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if (new)
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if_dump(new);
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if (c & IF_CHANGE_UP)
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neigh_if_up(new);
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/* FIXME: Notify protocols here */
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if (c & IF_CHANGE_DOWN)
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neigh_if_down(old);
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}
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void
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if_update(struct iface *new)
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{
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struct iface *i;
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unsigned c;
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WALK_LIST(i, iface_list)
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if (!strcmp(new->name, i->name))
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{
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unsigned c = if_changed(i, new);
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if (c)
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if (if_change_too_big_p(i, new)) /* Changed a lot, convert it to down/up */
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{
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struct iface *j = if_copy(new);
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if_notify_change(c, i, j);
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insert_node(&j->n, &i->n);
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DBG("Interface %s changed too much -- forcing down/up transition\n", i->name);
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i->flags &= ~IF_UP;
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if_notify_change(IF_CHANGE_DOWN | IF_CHANGE_FLAGS, i, NULL);
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rem_node(&i->n);
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if_free(i);
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goto newif;
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}
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c = if_changed(i, new);
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if_copy(i, new); /* Even if c==0 as we might need to update i->index et al. */
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i->flags |= IF_UPDATED;
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if (c)
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if_notify_change(c, i, new);
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return;
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}
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i = if_copy(new);
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i = mb_alloc(if_pool, sizeof(struct iface));
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newif:
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memcpy(i, new, sizeof(*i));
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i->flags |= IF_UPDATED;
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add_tail(&iface_list, &i->n);
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if_notify_change(IF_CHANGE_UP | IF_CHANGE_FLAGS | IF_CHANGE_MTU | IF_CHANGE_ADDR, NULL, i);
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if_notify_change(IF_CHANGE_UP | IF_CHANGE_FLAGS | IF_CHANGE_MTU, NULL, i);
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}
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void
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@ -174,4 +310,6 @@ if_init(void)
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{
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if_pool = rp_new(&root_pool, "Interfaces");
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init_list(&iface_list);
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neigh_slab = sl_new(if_pool, sizeof(neighbor));
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init_list(&neigh_list);
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}
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57
nest/iface.h
57
nest/iface.h
@ -18,8 +18,13 @@ struct iface {
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char name[16];
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unsigned flags;
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unsigned mtu;
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struct ifa *ifa; /* First address is primary */
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unsigned index; /* OS-dependent interface index */
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ip_addr ip; /* IP address of this host */
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ip_addr prefix; /* Network prefix */
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unsigned pxlen; /* Prefix length */
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ip_addr brd; /* Broadcast address */
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ip_addr opposite; /* Opposite end of a point-to-point link */
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struct neighbor *neigh; /* List of neighbors on this interface */
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};
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#define IF_UP 1
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@ -33,25 +38,12 @@ struct iface {
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#define IF_IGNORE 256
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#define IF_UPDATED 0x1000 /* Touched in last scan */
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/* Interface address */
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struct ifa {
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struct ifa *next;
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ip_addr ip; /* IP address of this host */
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ip_addr prefix; /* Network prefix */
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unsigned pxlen; /* Prefix length */
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ip_addr brd; /* Broadcast address */
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ip_addr opposite; /* Opposite end of a point-to-point link */
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struct neighbor *neigh; /* List of neighbors on this interface */
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};
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/* Interface change events */
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#define IF_CHANGE_UP 1
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#define IF_CHANGE_DOWN 2
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#define IF_CHANGE_FLAGS 4
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#define IF_CHANGE_FLAGS 4 /* Can be converted to down/up internally */
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#define IF_CHANGE_MTU 8
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#define IF_CHANGE_ADDR 16
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void if_init(void);
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void if_dump(struct iface *);
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@ -59,4 +51,39 @@ void if_dump_all(void);
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void if_update(struct iface *);
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void if_end_update(void);
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/*
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* Neighbor Cache. We hold (direct neighbor, protocol) pairs we've seen
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* along with pointer to protocol-specific data.
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*
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* The primary goal of this cache is to quickly validate all incoming
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* packets if their have been sent by our neighbors and to notify
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* protocols about lost neighbors when an interface goes down.
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*
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* Anyway, it can also contain `sticky' entries for currently unreachable
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* addresses which cause notification when the address becomes a neighbor.
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*/
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typedef struct neighbor {
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node n; /* Node in global neighbor list */
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ip_addr addr; /* Address of the neighbor */
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struct iface *iface; /* Interface address it's connected to */
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struct neighbor *sibling; /* Next in per-device chain */
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struct proto *proto; /* Protocol this belongs to */
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void *data; /* Protocol-specific data */
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unsigned flags;
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} neighbor;
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#define NEF_STICKY 1
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/*
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* Find neighbor or return NULL if it doesn't exist.
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* If you specify flags == NEF_STICKY, a sticky entry is created if the
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* address is not a neighbor, but NULL can still be returned if the address
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* given is invalid.
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*/
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neighbor *neigh_find(struct proto *, ip_addr *, unsigned flags);
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void neigh_dump(neighbor *);
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void neigh_dump_all(void);
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#endif
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@ -55,7 +55,7 @@ struct proto {
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void (*if_notify)(struct proto *, struct iface *new, struct iface *old);
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void (*rt_notify)(struct proto *, struct rte *new, struct rte *old);
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void (*neigh_lost_notify)(struct proto *, struct neighbor *neigh);
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void (*neigh_notify)(struct neighbor *neigh);
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void (*dump)(struct proto *); /* Debugging dump */
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void (*start)(struct proto *); /* Start the instance */
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void (*shutdown)(struct proto *, int time); /* Stop the instance */
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20
nest/route.h
20
nest/route.h
@ -13,6 +13,7 @@
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#include "lib/timer.h"
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struct protocol;
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struct proto;
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/*
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* Generic data structure for storing network prefixes. Also used
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@ -60,25 +61,6 @@ void fib_free(struct fib *); /* Destroy the fib */
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} \
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} while (0)
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/*
|
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* Neighbor Cache. We hold (direct neighbor, protocol) pairs we've seen
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* along with pointer to protocol-specific data.
|
||||
*
|
||||
* The primary goal of this cache is to quickly validate all incoming
|
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* packets if their have been sent by our neighbors and to notify
|
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* protocols about lost neighbors when an interface goes down.
|
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*/
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typedef struct neighbor {
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ip_addr addr; /* Address of the neighbor */
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struct next *next; /* Next in hashed chain */
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struct next *sibling; /* Next in per-device chain */
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struct proto *proto; /* Protocol this belongs to */
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void *data; /* Protocol-specific data */
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} neighbor;
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neighbor *neigh_find(ip_addr *); /* NULL if not a neighbor */
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/*
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* Master Routing Tables. Generally speaking, each of them is a list
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* of FIB (one per TOS) with each entry pointing to a list of route entries
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Reference in New Issue
Block a user