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Fixes a bug in LSA update of large LSAs.

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This commit is contained in:
Ondrej Zajicek 2010-11-04 17:22:43 +01:00
parent d3209d939d
commit d5356072ac
6 changed files with 81 additions and 62 deletions
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6
lib/lists.h
View File

@ -33,10 +33,10 @@ typedef struct list { /* In fact two overlayed nodes */
#define NODE (node *)
#define HEAD(list) ((void *)((list).head))
#define TAIL(list) ((void *)((list).tail))
#define WALK_LIST(n,list) for(n=HEAD(list);(NODE (n))->next; \
n=(void *)((NODE (n))->next))
#define NODE_NEXT(n) ((void *)((NODE (n))->next))
#define WALK_LIST(n,list) for(n=HEAD(list);(NODE (n))->next; n=NODE_NEXT(n))
#define WALK_LIST_DELSAFE(n,nxt,list) \
for(n=HEAD(list); nxt=(void *)((NODE (n))->next); n=(void *) nxt)
for(n=HEAD(list); nxt=NODE_NEXT(n); n=(void *) nxt)
/* WALK_LIST_FIRST supposes that called code removes each processed node */
#define WALK_LIST_FIRST(n,list) \
while(n=HEAD(list), (NODE (n))->next)

2
proto/ospf/hello.c
View File

@ -297,7 +297,7 @@ ospf_hello_send(timer *timer, int poll, struct ospf_neighbor *dirn)
pp = (u32 *) (((u8 *) pkt) + sizeof(struct ospf_hello_packet));
WALK_LIST(neigh, ifa->neigh_list)
{
if ((i+1) * sizeof(u32) + sizeof(struct ospf_hello_packet) > ospf_pkt_maxsize(ifa))
if ((i+1) * sizeof(u32) + sizeof(struct ospf_hello_packet) > ospf_pkt_bufsize(ifa))
{
OSPF_TRACE(D_PACKETS, "Too many neighbors on the interface!");
break;

109
proto/ospf/lsupd.c
View File

@ -330,67 +330,74 @@ ospf_lsupd_flood(struct proto_ospf *po,
void /* I send all I received in LSREQ */
ospf_lsupd_send_list(struct ospf_neighbor *n, list * l)
{
struct l_lsr_head *llsh;
u16 len;
u32 lsano;
struct top_hash_entry *en;
struct ospf_lsupd_packet *pk;
struct ospf_packet *op;
struct ospf_area *oa = n->ifa->oa;
struct proto_ospf *po = oa->po;
struct proto *p = &po->proto;
void *pktpos;
struct proto *p = &oa->po->proto;
struct l_lsr_head *lsr;
struct top_hash_entry *en;
struct ospf_lsupd_packet *pkt;
u32 len, len2, lsano;
char *buf;
if (EMPTY_LIST(*l))
return;
pkt = ospf_tx_buffer(n->ifa);
buf = (void *) pkt;
DBG("LSupd: 1st packet\n");
pk= ospf_tx_buffer(n->ifa);
op = &pk->ospf_packet;
ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
len = sizeof(struct ospf_lsupd_packet);
lsano = 0;
pktpos = (pk + 1);
WALK_LIST(llsh, *l)
lsr = HEAD(*l);
while(NODE_NEXT(lsr))
{
u32 domain = ospf_lsa_domain(llsh->lsh.type, n->ifa);
if ((en = ospf_hash_find(po->gr, domain, llsh->lsh.id,
llsh->lsh.rt, llsh->lsh.type)) == NULL)
continue; /* Probably flushed LSA */
/* FIXME This is a bug! I cannot flush LSA that is in lsrt */
/* Prepare the packet */
ospf_pkt_fill_hdr(n->ifa, pkt, LSUPD_P);
len = sizeof(struct ospf_lsupd_packet);
lsano = 0;
DBG("Sending LSA: Type=%u, ID=%R, RT=%R, SN: 0x%x, Age: %u\n",
llsh->lsh.type, llsh->lsh.id, llsh->lsh.rt, en->lsa.sn, en->lsa.age);
if (((u32) (len + en->lsa.length)) > ospf_pkt_maxsize(n->ifa))
/* Fill the packet with LSAs */
while(NODE_NEXT(lsr))
{
pk->lsano = htonl(lsano);
op->length = htons(len);
u32 domain = ospf_lsa_domain(lsr->lsh.type, n->ifa);
en = ospf_hash_find(oa->po->gr, domain, lsr->lsh.id, lsr->lsh.rt, lsr->lsh.type);
if (en == NULL)
{
/* Probably flushed LSA, this should not happen */
log(L_WARN "OSPF: LSA disappeared (Type: %04x, Id: %R, Rt: %R)",
lsr->lsh.type, lsr->lsh.id, lsr->lsh.rt);
lsr = NODE_NEXT(lsr);
continue;
}
OSPF_PACKET(ospf_dump_lsupd, pk, "LSUPD packet sent to %I via %s", n->ip, n->ifa->iface->name);
ospf_send_to(n->ifa, n->ip);
len2 = len + en->lsa.length;
if (len2 > ospf_pkt_maxsize(n->ifa))
{
/* The packet if full, stop adding LSAs and sent it */
if (lsano > 0)
break;
DBG("LSupd: next packet\n");
ospf_pkt_fill_hdr(n->ifa, pk, LSUPD_P);
len = sizeof(struct ospf_lsupd_packet);
lsano = 0;
pktpos = (pk + 1);
/* LSA is larger than MTU, check buffer size */
if (len2 > ospf_pkt_bufsize(n->ifa))
{
/* Cannot fit in a tx buffer, skip that */
log(L_WARN "OSPF: LSA too large to send (Type: %04x, Id: %R, Rt: %R)",
lsr->lsh.type, lsr->lsh.id, lsr->lsh.rt);
lsr = NODE_NEXT(lsr);
continue;
}
}
/* Copy the LSA to the packet */
htonlsah(&(en->lsa), (struct ospf_lsa_header *) (buf + len));
htonlsab(en->lsa_body, buf + len + sizeof(struct ospf_lsa_header),
en->lsa.length - sizeof(struct ospf_lsa_header));
len = len2;
lsano++;
lsr = NODE_NEXT(lsr);
}
htonlsah(&(en->lsa), pktpos);
pktpos = pktpos + sizeof(struct ospf_lsa_header);
htonlsab(en->lsa_body, pktpos, en->lsa.length - sizeof(struct ospf_lsa_header));
pktpos = pktpos + en->lsa.length - sizeof(struct ospf_lsa_header);
len += en->lsa.length;
lsano++;
}
if (lsano > 0)
{
pk->lsano = htonl(lsano);
op->length = htons(len);
OSPF_PACKET(ospf_dump_lsupd, pk, "LSUPD packet sent to %I via %s", n->ip, n->ifa->iface->name);
if (lsano == 0)
break;
/* Send the packet */
pkt->lsano = htonl(lsano);
pkt->ospf_packet.length = htons(len);
OSPF_PACKET(ospf_dump_lsupd, pkt, "LSUPD packet sent to %I via %s",
n->ip, n->ifa->iface->name);
ospf_send_to(n->ifa, n->ip);
}
}

3
proto/ospf/ospf.h
View File

@ -10,7 +10,6 @@
#define _BIRD_OSPF_H_
#define MAXNETS 10
#define OSPF_VLINK_MTU 576 /* RFC2328 - A.1 */
#define OSPF_MAX_PKT_SIZE 65536
/*
* RFC 2328 says, maximum packet size is 65535
@ -53,11 +52,13 @@ do { if ((p->debug & D_PACKETS) || OSPF_FORCE_DEBUG) \
#ifndef IPV6
#define OSPFv2 1
#define OSPF_VERSION 2
#define OSPF_VLINK_MTU 576 /* RFC 2328 A.1 */
#define AllSPFRouters ipa_from_u32(0xe0000005) /* 224.0.0.5 */
#define AllDRouters ipa_from_u32(0xe0000006) /* 224.0.0.6 */
#else
#define OSPFv3 1
#define OSPF_VERSION 3
#define OSPF_VLINK_MTU 1280 /* RFC 5340 A.1 */
#define AllSPFRouters _MI(0xFF020000, 0, 0, 5) /* FF02::5 */
#define AllDRouters _MI(0xFF020000, 0, 0, 6) /* FF02::6 */
#endif

10
proto/ospf/packet.c
View File

@ -39,19 +39,17 @@ ospf_pkt_fill_hdr(struct ospf_iface *ifa, void *buf, u8 h_type)
unsigned
ospf_pkt_maxsize(struct ospf_iface *ifa)
{
/* For virtual links use mtu=576, can be mtu < 576? */
unsigned mtu = (ifa->type == OSPF_IT_VLINK) ? OSPF_VLINK_MTU : ifa->iface->mtu;
unsigned add = 0;
unsigned headers = SIZE_OF_IP_HEADER;
#ifdef OSPFv2
add = ((ifa->autype == OSPF_AUTH_CRYPT) ? OSPF_AUTH_CRYPT_SIZE : 0);
if (ifa->autype == OSPF_AUTH_CRYPT)
headers += OSPF_AUTH_CRYPT_SIZE;
#endif
return ((mtu <= ifa->iface->mtu) ? mtu : ifa->iface->mtu) -
SIZE_OF_IP_HEADER - add;
return mtu - headers;
}
#ifdef OSPFv2
static void

13
proto/ospf/packet.h
View File

@ -21,4 +21,17 @@ void ospf_send_to(struct ospf_iface *ifa, ip_addr ip);
static inline void * ospf_tx_buffer(struct ospf_iface *ifa) { return ifa->sk->tbuf; }
static inline unsigned
ospf_pkt_bufsize(struct ospf_iface *ifa)
{
#ifdef OSPFv2
unsigned headers = (ifa->autype == OSPF_AUTH_CRYPT) ? OSPF_AUTH_CRYPT_SIZE : 0;
#else
unsigned headers = 0;
#endif
return ifa->sk->tbsize - headers;
}
#endif /* _BIRD_OSPF_PACKET_H_ */