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-rw-r--r--sysdep/linux/netlink/netlink.c151
1 files changed, 62 insertions, 89 deletions
diff --git a/sysdep/linux/netlink/netlink.c b/sysdep/linux/netlink/netlink.c
index f45fe15..b59b32f 100644
--- a/sysdep/linux/netlink/netlink.c
+++ b/sysdep/linux/netlink/netlink.c
@@ -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)
- {
- /* 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, ra.iface,
+ (i->rtm_flags & RTNH_F_ONLINK) ? NEF_ONLINK : 0);
+ if (!ng || (ng->scope == SCOPE_HOST))
{
- 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;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 22:05:44 +0100