[PATCH 3.8 138/166] IPv6: Fixed support for blackhole and prohibit routes

Kamal Mostafa
2014-01-15T21:52:32Z

From: Kamala R <kamala@aristanetworks.com>

[ Upstream commit 7150aede5dd241539686e17d9592f5ebd28a2cda ]

The behaviour of blackhole and prohibit routes has been corrected by setting
the input and output pointers of the dst variable appropriately. For
blackhole routes, they are set to dst_discard and to ip6_pkt_discard and
ip6_pkt_discard_out respectively for prohibit routes.

ipv6: ip6_pkt_prohibit(_out) should not depend on
CONFIG_IPV6_MULTIPLE_TABLES

We need ip6_pkt_prohibit(_out) available without
CONFIG_IPV6_MULTIPLE_TABLES

Signed-off-by: Kamala R <kamala@aristanetworks.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
net/ipv6/route.c | 22 ++++++++++------------
1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index abf3556..9b530eb 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -78,6 +78,8 @@ static int ip6_dst_gc(struct dst_ops *ops);

static int ip6_pkt_discard(struct sk_buff *skb);
static int ip6_pkt_discard_out(struct sk_buff *skb);
+static int ip6_pkt_prohibit(struct sk_buff *skb);
+static int ip6_pkt_prohibit_out(struct sk_buff *skb);
static void ip6_link_failure(struct sk_buff *skb);
static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb, u32 mtu);
@@ -240,9 +242,6 @@ static const struct rt6_info ip6_null_entry_template = {

#ifdef CONFIG_IPV6_MULTIPLE_TABLES

-static int ip6_pkt_prohibit(struct sk_buff *skb);
-static int ip6_pkt_prohibit_out(struct sk_buff *skb);
-
static const struct rt6_info ip6_prohibit_entry_template = {
.dst = {
.__refcnt = ATOMIC_INIT(1),
@@ -1512,21 +1511,24 @@ int ip6_route_add(struct fib6_config *cfg)
goto out;
}
}
- rt->dst.output = ip6_pkt_discard_out;
- rt->dst.input = ip6_pkt_discard;
rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
switch (cfg->fc_type) {
case RTN_BLACKHOLE:
rt->dst.error = -EINVAL;
+ rt->dst.output = dst_discard;
+ rt->dst.input = dst_discard;
break;
case RTN_PROHIBIT:
rt->dst.error = -EACCES;
+ rt->dst.output = ip6_pkt_prohibit_out;
+ rt->dst.input = ip6_pkt_prohibit;
break;
case RTN_THROW:
- rt->dst.error = -EAGAIN;
- break;
default:
- rt->dst.error = -ENETUNREACH;
+ rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
+ : -ENETUNREACH;
+ rt->dst.output = ip6_pkt_discard_out;
+ rt->dst.input = ip6_pkt_discard;
break;
}
goto install_route;
@@ -2106,8 +2108,6 @@ static int ip6_pkt_discard_out(struct sk_buff *skb)
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
}

-#ifdef CONFIG_IPV6_MULTIPLE_TABLES
-
static int ip6_pkt_prohibit(struct sk_buff *skb)
{
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
@@ -2119,8 +2119,6 @@ static int ip6_pkt_prohibit_out(struct sk_buff *skb)
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
}

-#endif
-
/*
* Allocate a dst for local (unicast / anycast) address.
*/
--
1.8.3.2