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Date: Thu, 07 Apr 2011 17:32:49 +0900
From: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Subject: Re: problem of "ipv4: revert Set rt->rt_iif more sanely on output routes."
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> writes:
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp> writes:
>
>> David Miller <davem@...emloft.net> writes:
>>
>>> So fix is something like:
>>>
>>> 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
>>>
>>> This should fix the bug and not introduce new regressions.
>>>
>>> Can you write and test such a patch with your test case?
>>
>> Ok. I'll try, but I'm not sure I understand the above correctly. Well,
>> I'll send the patch after testing.
>
> This patch seems to work for avahi-daemon without any warning.
>
> BTW, the above meant change from (there was before) "fl.iif" to
> "rt_route_iif"? If so, this patch is not enough. I'm not sure
>
> + rth->rt_route_iif = 0;
> + rth->rt_iif = oldflp4->flowi4_oif ? : dev_out->ifindex;
>
> is correct one or not. Please review.
Forgot the patch.
--
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
[PATCH] Fix "Set rt->rt_iif more sanely on output routes."
1018b5c01636c7c6bda31a719bda34fc631db29a 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@...l.parknet.co.jp>
---
include/net/route.h | 5 +++--
net/ipv4/route.c | 8 ++++++--
net/ipv4/xfrm4_policy.c | 1 +
3 files changed, 10 insertions(+), 4 deletions(-)
diff -puN include/net/route.h~revert-avahi-breaker include/net/route.h
--- linux-2.6/include/net/route.h~revert-avahi-breaker 2011-04-07 17:12:05.000000000 +0900
+++ linux-2.6-hirofumi/include/net/route.h 2011-04-07 17:12:05.000000000 +0900
@@ -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 {
diff -puN net/ipv4/route.c~revert-avahi-breaker net/ipv4/route.c
--- linux-2.6/net/ipv4/route.c~revert-avahi-breaker 2011-04-07 17:12:05.000000000 +0900
+++ linux-2.6-hirofumi/net/ipv4/route.c 2011-04-07 17:12:05.000000000 +0900
@@ -1891,6 +1891,7 @@ static int ip_route_input_mc(struct sk_b
#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_buf
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(c
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(s
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(s
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;
diff -puN net/ipv4/xfrm4_policy.c~revert-avahi-breaker net/ipv4/xfrm4_policy.c
--- linux-2.6/net/ipv4/xfrm4_policy.c~revert-avahi-breaker 2011-04-07 17:12:05.000000000 +0900
+++ linux-2.6-hirofumi/net/ipv4/xfrm4_policy.c 2011-04-07 17:12:05.000000000 +0900
@@ -74,6 +74,7 @@ static int xfrm4_fill_dst(struct xfrm_ds
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;
_
--
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