ipv6: Add more debugging around accept-ra logic.
This is disabled by default, just like similar debug info
already in this module. But, makes it easier to find out
why RA is not being accepted when debugging strange behaviour.
Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index ca8d4ea..736c11c 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1070,6 +1070,9 @@
optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) -
sizeof(struct ra_msg);
+ ND_PRINTK(2, info,
+ "RA: %s, dev: %s\n",
+ __func__, skb->dev->name);
if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK(2, warn, "RA: source address is not link-local\n");
return;
@@ -1102,13 +1105,21 @@
return;
}
- if (!ipv6_accept_ra(in6_dev))
+ if (!ipv6_accept_ra(in6_dev)) {
+ ND_PRINTK(2, info,
+ "RA: %s, did not accept ra for dev: %s\n",
+ __func__, skb->dev->name);
goto skip_linkparms;
+ }
#ifdef CONFIG_IPV6_NDISC_NODETYPE
/* skip link-specific parameters from interior routers */
- if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
+ ND_PRINTK(2, info,
+ "RA: %s, nodetype is NODEFAULT, dev: %s\n",
+ __func__, skb->dev->name);
goto skip_linkparms;
+ }
#endif
if (in6_dev->if_flags & IF_RS_SENT) {
@@ -1130,11 +1141,20 @@
(ra_msg->icmph.icmp6_addrconf_other ?
IF_RA_OTHERCONF : 0);
- if (!in6_dev->cnf.accept_ra_defrtr)
+ if (!in6_dev->cnf.accept_ra_defrtr) {
+ ND_PRINTK(2, info,
+ "RA: %s, defrtr is false for dev: %s\n",
+ __func__, skb->dev->name);
goto skip_defrtr;
+ }
- if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0))
+ if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
+ NULL, 0)) {
+ ND_PRINTK(2, info,
+ "RA: %s, chk_addr failed for dev: %s\n",
+ __func__, skb->dev->name);
goto skip_defrtr;
+ }
lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
@@ -1163,8 +1183,10 @@
rt = NULL;
}
+ ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n",
+ rt, lifetime, skb->dev->name);
if (rt == NULL && lifetime) {
- ND_PRINTK(3, dbg, "RA: adding default router\n");
+ ND_PRINTK(3, info, "RA: adding default router\n");
rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
if (rt == NULL) {
@@ -1260,12 +1282,21 @@
NEIGH_UPDATE_F_ISROUTER);
}
- if (!ipv6_accept_ra(in6_dev))
+ if (!ipv6_accept_ra(in6_dev)) {
+ ND_PRINTK(2, info,
+ "RA: %s, accept_ra is false for dev: %s\n",
+ __func__, skb->dev->name);
goto out;
+ }
#ifdef CONFIG_IPV6_ROUTE_INFO
- if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0))
+ if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr,
+ NULL, 0)) {
+ ND_PRINTK(2, info,
+ "RA: %s, chk-addr (route info) is false for dev: %s\n",
+ __func__, skb->dev->name);
goto skip_routeinfo;
+ }
if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
struct nd_opt_hdr *p;
@@ -1293,8 +1324,12 @@
#ifdef CONFIG_IPV6_NDISC_NODETYPE
/* skip link-specific ndopts from interior routers */
- if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
+ if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) {
+ ND_PRINTK(2, info,
+ "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n",
+ __func__, skb->dev->name);
goto out;
+ }
#endif
if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {