From mboxrd@z Thu Jan 1 00:00:00 1970 From: greearb@candelatech.com Subject: [PATCH v2 1/2] ipv6: Add more debugging around accept-ra logic. Date: Tue, 24 Jun 2014 14:14:47 -0700 Message-ID: <1403644488-21709-1-git-send-email-greearb@candelatech.com> Cc: Ben Greear To: netdev@vger.kernel.org Return-path: Received: from mail2.candelatech.com ([208.74.158.173]:51390 "EHLO mail2.candelatech.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751419AbaFXVOw (ORCPT ); Tue, 24 Jun 2014 17:14:52 -0400 Sender: netdev-owner@vger.kernel.org List-ID: From: Ben Greear 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 --- v2: No changes since last time. Patch is against 3.14.8+ net/ipv6/ndisc.c | 51 +++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 43 insertions(+), 8 deletions(-) diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 09a22f4..2fef3d5 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1073,6 +1073,9 @@ static void ndisc_router_discovery(struct sk_buff *skb) 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; @@ -1105,13 +1108,21 @@ static void ndisc_router_discovery(struct sk_buff *skb) 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) { @@ -1133,11 +1144,20 @@ static void ndisc_router_discovery(struct sk_buff *skb) (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); @@ -1166,8 +1186,10 @@ static void ndisc_router_discovery(struct sk_buff *skb) 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) { @@ -1263,12 +1285,21 @@ skip_linkparms: 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; @@ -1296,8 +1327,12 @@ skip_routeinfo: #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) { -- 1.7.11.7