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Many changes in (mainly) kernel syncers.

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- BSD kernel syncer is now self-conscious and can learn alien routes
- important bugfix in BSD kernel syncer (crash after protocol restart)
- many minor changes and bugfixes in kernel syncers and neighbor cache
- direct protocol does not generate host and link local routes
- min_scope check is removed, all routes have SCOPE_UNIVERSE by default
- also fixes some remaining compiler warnings
This commit is contained in:
Ondrej Zajicek
2010-02-26 10:55:58 +01:00
parent e81b440f68
commit ff2857b03d
19 changed files with 279 additions and 298 deletions
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151
sysdep/linux/netlink/netlink.c
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@@ -52,7 +52,6 @@ struct nl_sock
static struct nl_sock nl_scan = {.fd = -1}; /* Netlink socket for synchronous scan */
static struct nl_sock nl_req = {.fd = -1}; /* Netlink socket for requests */
static void
nl_open_sock(struct nl_sock *nl)
{
@@ -555,23 +554,7 @@ krt_set_notify(struct krt_proto *p, net *n UNUSED, rte *new, rte *old)
nl_send_route(p, new, 1);
}
static struct iface *
krt_temp_iface(struct krt_proto *p, unsigned index)
{
struct iface *i, *j;
WALK_LIST(i, p->scan.temp_ifs)
if (i->index == index)
return i;
i = mb_allocz(p->p.pool, sizeof(struct iface));
if (j = if_find_by_index(index))
strcpy(i->name, j->name);
else
strcpy(i->name, "?");
i->index = index;
add_tail(&p->scan.temp_ifs, &i->n);
return i;
}
#define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0)
static void
nl_parse_route(struct nlmsghdr *h, int scan)
@@ -599,31 +582,7 @@ nl_parse_route(struct nlmsghdr *h, int scan)
#endif
(a[RTA_GATEWAY] && RTA_PAYLOAD(a[RTA_GATEWAY]) != sizeof(ip_addr)))
{
log(L_ERR "nl_parse_route: Malformed message received");
return;
}
p = nl_table_map[i->rtm_table]; /* Do we know this table? */
if (!p)
return;
#ifdef IPV6
if (a[RTA_IIF])
{
DBG("KRT: Ignoring route with IIF set\n");
return;
}
#else
if (i->rtm_tos != 0) /* We don't support TOS */
{
DBG("KRT: Ignoring route with TOS %02x\n", i->rtm_tos);
return;
}
#endif
if (scan && !new)
{
DBG("KRT: Ignoring route deletion\n");
log(L_ERR "KRT: Malformed message received");
return;
}
@@ -634,33 +593,57 @@ nl_parse_route(struct nlmsghdr *h, int scan)
}
else
dst = IPA_NONE;
if (a[RTA_OIF])
memcpy(&oif, RTA_DATA(a[RTA_OIF]), sizeof(oif));
else
oif = ~0;
DBG("Got %I/%d, type=%d, oif=%d, table=%d, prid=%d, proto=%s\n", dst, i->rtm_dst_len, i->rtm_type, oif, i->rtm_table, i->rtm_protocol, p->p.name);
DBG("KRT: Got %I/%d, type=%d, oif=%d, table=%d, prid=%d, proto=%s\n", dst, i->rtm_dst_len, i->rtm_type, oif, i->rtm_table, i->rtm_protocol, p->p.name);
p = nl_table_map[i->rtm_table]; /* Do we know this table? */
if (!p)
SKIP("unknown table %d", i->rtm_table);
#ifdef IPV6
if (a[RTA_IIF])
SKIP("IIF set\n");
#else
if (i->rtm_tos != 0) /* We don't support TOS */
SKIP("TOS %02x\n", i->rtm_tos);
#endif
if (scan && !new)
SKIP("RTM_DELROUTE in scan\n");
int c = ipa_classify_net(dst);
if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK))
SKIP("strange class/scope\n");
// ignore rtm_scope, it is not a real scope
// if (i->rtm_scope != RT_SCOPE_UNIVERSE)
// SKIP("scope %u\n", i->rtm_scope);
switch (i->rtm_protocol)
{
case RTPROT_UNSPEC:
SKIP("proto unspec\n");
case RTPROT_REDIRECT:
src = KRT_SRC_REDIRECT;
break;
case RTPROT_KERNEL:
DBG("Route originated in kernel, ignoring\n");
src = KRT_SRC_KERNEL;
return;
case RTPROT_BIRD:
#ifdef IPV6
case RTPROT_BOOT:
/* Current Linux kernels don't remember rtm_protocol for IPv6 routes and supply RTPROT_BOOT instead */
#endif
if (!scan)
{
DBG("Echo of our own route, ignoring\n");
return;
}
SKIP("echo\n");
src = KRT_SRC_BIRD;
break;
case RTPROT_BOOT:
default:
src = KRT_SRC_ALIEN;
}
@@ -679,52 +662,48 @@ nl_parse_route(struct nlmsghdr *h, int scan)
switch (i->rtm_type)
{
case RTN_UNICAST:
if (oif == ~0U)
ra.iface = if_find_by_index(oif);
if (!ra.iface)
{
log(L_ERR "KRT: Mysterious route with no OIF (%I/%d)", net->n.prefix, net->n.pxlen);
log(L_ERR "KRT: Received route %I/%d with unknown ifindex %u",
net->n.prefix, net->n.pxlen, oif);
return;
}
if (a[RTA_GATEWAY])
{
struct iface *ifa = if_find_by_index(oif);
neighbor *ng;
ra.dest = RTD_ROUTER;
memcpy(&ra.gw, RTA_DATA(a[RTA_GATEWAY]), sizeof(ra.gw));
ipa_ntoh(ra.gw);
if (i->rtm_flags & RTNH_F_ONLINK)
ng = neigh_find2(&p->p, &ra.gw, ra.iface,
(i->rtm_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0);
if (!ng || (ng->scope == SCOPE_HOST))
{
/* route with 'onlink' attribute */
ra.iface = if_find_by_index(oif);
if (ra.iface == NULL)
{
log(L_WARN "Kernel told us to use unknown interface %u for %I/%d",
oif, net->n.prefix, net->n.pxlen);
return;
}
}
else
{
ng = neigh_find2(&p->p, &ra.gw, ifa, 0);
if (ng && ng->scope)
{
if (ng->iface != ifa)
log(L_WARN "KRT: Route with unexpected iface for %I/%d", net->n.prefix, net->n.pxlen);
ra.iface = ng->iface;
}
else
{
log(L_WARN "Kernel told us to use non-neighbor %I for %I/%d", ra.gw, net->n.prefix, net->n.pxlen);
return;
}
log(L_ERR "KRT: Received route %I/%d with strange next-hop %I",
net->n.prefix, net->n.pxlen, ra.gw);
return;
}
}
else
{
ra.dest = RTD_DEVICE;
ra.iface = krt_temp_iface(p, oif);
/*
* In Linux IPv6, 'native' device routes have proto
* RTPROT_BOOT and not RTPROT_KERNEL (which they have in
* IPv4 and which is expected). We cannot distinguish
* 'native' and user defined device routes, so we ignore all
* such device routes and for consistency, we have the same
* behavior in IPv4. Anyway, users should use RTPROT_STATIC
* for their 'alien' routes.
*/
if (i->rtm_protocol == RTPROT_BOOT)
src = KRT_SRC_KERNEL;
}
break;
case RTN_BLACKHOLE:
ra.dest = RTD_BLACKHOLE;
@@ -737,13 +716,7 @@ nl_parse_route(struct nlmsghdr *h, int scan)
break;
/* FIXME: What about RTN_THROW? */
default:
DBG("KRT: Ignoring route with type=%d\n", i->rtm_type);
return;
}
if (i->rtm_scope != RT_SCOPE_UNIVERSE)
{
DBG("KRT: Ignoring route with scope=%d\n", i->rtm_scope);
SKIP("type %d\n", i->rtm_type);
return;
}