netfilter: ipv4: propagate routing errors from ip_route_me_harder()

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Propagate routing errors from ip_route_me_harder() when dropping a packet
using NF_DROP_ERR(). This makes userspace get the proper error instead of
EPERM for everything.

Example:

# ip r a unreachable default table 100
# ip ru add fwmark 0x1 lookup 100
# iptables -t mangle -A OUTPUT -d 8.8.8.8 -j MARK --set-mark 0x1

Current behaviour:

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted
ping: sendmsg: Operation not permitted

New behaviour:

PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
ping: sendmsg: Network is unreachable
ping: sendmsg: Network is unreachable
ping: sendmsg: Network is unreachable
ping: sendmsg: Network is unreachable

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

...

This commit is contained in:

Patrick McHardy 2013-04-05 06:41:10 +00:00 • committed by Pablo Neira Ayuso

parent 6b0ee8c036

commit c9e1673a0a

3 changed files with 14 additions and 9 deletions

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8

net/ipv4/netfilter.c

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9

net/ipv4/netfilter/iptable_mangle.c

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6

net/ipv4/netfilter/iptable_nat.c

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