kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

ipv4: Fix "Set rt->rt_iif more sanely on output routes."

Browse source 
Commit 1018b5c016 ("Set rt->rt_iif more
sanely on output routes.")  breaks rt_is_{output,input}_route.

This became the cause to return "IP_PKTINFO's ->ipi_ifindex == 0".

To fix it, this does:

1) Add "int rt_route_iif;" to struct rtable

2) For input routes, always set rt_route_iif to same value as rt_iif

3) For output routes, always set rt_route_iif to zero.  Set rt_iif
   as it is done currently.

4) Change rt_is_{output,input}_route() to test rt_route_iif

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
OGAWA Hirofumi 2011-04-07 14:04:08 -07:00 committed by David S. Miller
parent 9b57e1a79e
commit 1b86a58f9d
3 changed files with 10 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
include/net/route.h
View file

@ -64,6 +64,7 @@ struct rtable {
__be32 rt_dst; /* Path destination */
__be32 rt_src; /* Path source */
int rt_route_iif;
int rt_iif;
int rt_oif;
__u32 rt_mark;
@ -80,12 +81,12 @@ struct rtable {
static inline bool rt_is_input_route(struct rtable *rt)
{
return rt->rt_iif != 0;
return rt->rt_route_iif != 0;
}
static inline bool rt_is_output_route(struct rtable *rt)
{
return rt->rt_iif == 0;
return rt->rt_route_iif == 0;
}
struct ip_rt_acct {

8
net/ipv4/route.c
View file

@ -1891,6 +1891,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
#ifdef CONFIG_IP_ROUTE_CLASSID
rth->dst.tclassid = itag;
#endif
rth->rt_route_iif = dev->ifindex;
rth->rt_iif = dev->ifindex;
rth->dst.dev = init_net.loopback_dev;
dev_hold(rth->dst.dev);
@ -2026,6 +2027,7 @@ static int __mkroute_input(struct sk_buff *skb,
rth->rt_key_src = saddr;
rth->rt_src = saddr;
rth->rt_gateway = daddr;
rth->rt_route_iif = in_dev->dev->ifindex;
rth->rt_iif = in_dev->dev->ifindex;
rth->dst.dev = (out_dev)->dev;
dev_hold(rth->dst.dev);
@ -2202,6 +2204,7 @@ local_input:
#ifdef CONFIG_IP_ROUTE_CLASSID
rth->dst.tclassid = itag;
#endif
rth->rt_route_iif = dev->ifindex;
rth->rt_iif = dev->ifindex;
rth->dst.dev = net->loopback_dev;
dev_hold(rth->dst.dev);
@ -2401,7 +2404,8 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
rth->rt_mark = oldflp4->flowi4_mark;
rth->rt_dst = fl4->daddr;
rth->rt_src = fl4->saddr;
rth->rt_iif = 0;
rth->rt_route_iif = 0;
rth->rt_iif = oldflp4->flowi4_oif ? : dev_out->ifindex;
/* get references to the devices that are to be hold by the routing
cache entry */
rth->dst.dev = dev_out;
@ -2716,6 +2720,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
rt->rt_key_dst = ort->rt_key_dst;
rt->rt_key_src = ort->rt_key_src;
rt->rt_tos = ort->rt_tos;
rt->rt_route_iif = ort->rt_route_iif;
rt->rt_iif = ort->rt_iif;
rt->rt_oif = ort->rt_oif;
rt->rt_mark = ort->rt_mark;
@ -2725,7 +2730,6 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
rt->rt_type = ort->rt_type;
rt->rt_dst = ort->rt_dst;
rt->rt_src = ort->rt_src;
rt->rt_iif = ort->rt_iif;
rt->rt_gateway = ort->rt_gateway;
rt->rt_spec_dst = ort->rt_spec_dst;
rt->peer = ort->peer;

1
net/ipv4/xfrm4_policy.c
View file

@ -74,6 +74,7 @@ static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
rt->rt_key_dst = fl4->daddr;
rt->rt_key_src = fl4->saddr;
rt->rt_tos = fl4->flowi4_tos;
rt->rt_route_iif = fl4->flowi4_iif;
rt->rt_iif = fl4->flowi4_iif;
rt->rt_oif = fl4->flowi4_oif;
rt->rt_mark = fl4->flowi4_mark;