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Refactoring of OSPF messages.

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This commit is contained in:
Ondrej Zajicek
2014-10-24 10:27:21 +02:00
parent 78342404ff
commit f8fefde318
15 changed files with 606 additions and 671 deletions
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78
proto/ospf/hello.c
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@@ -114,7 +114,7 @@ ospf_send_hello(struct ospf_iface *ifa, int kind, struct ospf_neighbor *dirn)
{
if (i == max)
{
log(L_WARN "%s: Too many neighbors on interface %s", p->p.name, ifa->ifname);
log(L_WARN "%s: Too many neighbors on %s", p->p.name, ifa->ifname);
break;
}
neighbors[i] = htonl(neigh->rid);
@@ -188,16 +188,21 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
struct ospf_neighbor *n, ip_addr faddr)
{
struct ospf_proto *p = ifa->oa->po;
char *beg = "OSPF: Bad HELLO packet from ";
const char *err_dsc = NULL;
u32 rcv_iface_id, rcv_helloint, rcv_deadint, rcv_dr, rcv_bdr;
u8 rcv_options, rcv_priority;
u32 *neighbors;
u32 neigh_count;
uint plen, i;
uint plen, i, err_val = 0;
/* RFC 2328 10.5 */
OSPF_TRACE(D_PACKETS, "HELLO packet received from %I via %s", faddr, ifa->ifname);
/*
* We may not yet havethe associate neighbor, so we use Router ID from the
* packet instead of one from the neighbor structure for log messages.
*/
u32 rcv_rid = ntohl(pkt->routerid);
OSPF_TRACE(D_PACKETS, "HELLO packet received from nbr %R on %s", rcv_rid, ifa->ifname);
plen = ntohs(pkt->length);
@@ -206,10 +211,7 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
struct ospf_hello2_packet *ps = (void *) pkt;
if (plen < sizeof(struct ospf_hello2_packet))
{
log(L_ERR "%s%I - too short (%u B)", beg, faddr, plen);
return;
}
DROP("too short", plen);
rcv_iface_id = 0;
rcv_helloint = ntohs(ps->helloint);
@@ -223,10 +225,7 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
if ((ifa->type != OSPF_IT_VLINK) &&
(ifa->type != OSPF_IT_PTP) &&
(pxlen != ifa->addr->pxlen))
{
log(L_ERR "%s%I - prefix length mismatch (%d)", beg, faddr, pxlen);
return;
}
DROP("prefix length mismatch", pxlen);
neighbors = ps->neighbors;
neigh_count = (plen - sizeof(struct ospf_hello2_packet)) / sizeof(u32);
@@ -236,10 +235,7 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
struct ospf_hello3_packet *ps = (void *) pkt;
if (plen < sizeof(struct ospf_hello3_packet))
{
log(L_ERR "%s%I - too short (%u B)", beg, faddr, plen);
return;
}
DROP("too short", plen);
rcv_iface_id = ntohl(ps->iface_id);
rcv_helloint = ntohs(ps->helloint);
@@ -254,23 +250,14 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
}
if (rcv_helloint != ifa->helloint)
{
log(L_ERR "%s%I - hello interval mismatch (%d)", beg, faddr, rcv_helloint);
return;
}
DROP("hello interval mismatch", rcv_helloint);
if (rcv_deadint != ifa->deadint)
{
log(L_ERR "%s%I - dead interval mismatch (%d)", beg, faddr, rcv_deadint);
return;
}
DROP("dead interval mismatch", rcv_deadint);
/* Check whether bits E, N match */
if ((rcv_options ^ ifa->oa->options) & (OPT_E | OPT_N))
{
log(L_ERR "%s%I - area type mismatch (%x)", beg, faddr, rcv_options);
return;
}
DROP("area type mismatch", rcv_options);
/* Check consistency of existing neighbor entry */
if (n)
@@ -279,11 +266,11 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
if (ospf_is_v2(p) && ((t == OSPF_IT_BCAST) || (t == OSPF_IT_NBMA) || (t == OSPF_IT_PTMP)))
{
/* Neighbor identified by IP address; Router ID may change */
if (n->rid != ntohl(pkt->routerid))
if (n->rid != rcv_rid)
{
OSPF_TRACE(D_EVENTS, "Neighbor %I has changed Router ID from %R to %R",
n->ip, n->rid, ntohl(pkt->routerid));
ospf_neigh_remove(n);
OSPF_TRACE(D_EVENTS, "Neighbor %R on %s changed Router ID to %R",
n->rid, ifa->ifname, rcv_rid);
ospf_neigh_sm(n, INM_KILLNBR);
n = NULL;
}
}
@@ -292,7 +279,8 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
/* Neighbor identified by Router ID; IP address may change */
if (!ipa_equal(faddr, n->ip))
{
OSPF_TRACE(D_EVENTS, "Neighbor address changed from %I to %I", n->ip, faddr);
OSPF_TRACE(D_EVENTS, "Neighbor %R on %s changed IP address to %I",
n->rid, ifa->ifname, n->ip, faddr);
n->ip = faddr;
}
}
@@ -305,28 +293,26 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
struct nbma_node *nn = find_nbma_node(ifa, faddr);
if (!nn && ifa->strictnbma)
{
log(L_WARN "Ignoring new neighbor: %I on %s", faddr, ifa->ifname);
return;
}
DROP1("new neighbor denied");
if (nn && (ifa->type == OSPF_IT_NBMA) &&
(((rcv_priority == 0) && nn->eligible) ||
((rcv_priority > 0) && !nn->eligible)))
{
log(L_ERR "Eligibility mismatch for neighbor: %I on %s", faddr, ifa->ifname);
return;
}
DROP("eligibility mismatch", rcv_priority);
if (nn)
nn->found = 1;
}
// XXXX format
// "ospf1: New neighbor found: 192.168.1.1/fe80:1234:1234:1234:1234 on eth0";
// "ospf1: New neighbor found: 192.168.1.1 on eth0 at fe80:1234:1234:1234:1234";
// "ospf1: Neighbor 192.168.1.1 on eth0 found, IP adress fe80:1234:1234:1234:1234";
OSPF_TRACE(D_EVENTS, "New neighbor found: %I on %s", faddr, ifa->ifname);
n = ospf_neighbor_new(ifa);
n->rid = ntohl(pkt->routerid);
n->rid = rcv_rid;
n->ip = faddr;
n->dr = rcv_dr;
n->bdr = rcv_bdr;
@@ -367,7 +353,7 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
ospf_neigh_sm(n, INM_1WAYREC);
return;
found_self:
found_self:
ospf_neigh_sm(n, INM_2WAYREC);
@@ -400,4 +386,10 @@ ospf_receive_hello(struct ospf_packet *pkt, struct ospf_iface *ifa,
((n->bdr != n_id) && (old_bdr == n_id)))
ospf_iface_sm(ifa, ISM_NEICH);
}
return;
drop:
LOG_PKT("Bad HELLO packet from nbr %R on %s - %s (%u)",
rcv_rid, ifa->ifname, err_dsc, err_val);
}