xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ipv4: add LINUX_MIB_IPRPFILTER snmp counter

Browse Source 
Christoph Lameter mentioned that packets could be dropped in input path
because of rp_filter settings, without any SNMP counter being
incremented. System administrator can have a hard time to track the
problem.

This patch introduces a new counter, LINUX_MIB_IPRPFILTER, incremented
each time we drop a packet because Reverse Path Filter triggers.

(We receive an IPv4 datagram on a given interface, and find the route to
send an answer would use another interface)

netstat -s | grep IPReversePathFilter
    IPReversePathFilter: 21714

Reported-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2010-06-02 12:05:27 +00:00
committed by David S. Miller
parent 8cbccbe761
commit b5f7e75547
5 changed files with 27 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
net/ipv4/fib_frontend.c
View File

@@ -284,7 +284,7 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
if (no_addr)
goto last_resort;
if (rpf == 1)
goto e_inval;
goto e_rpf;
fl.oif = dev->ifindex;
ret = 0;
@@ -299,7 +299,7 @@ int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif,
last_resort:
if (rpf)
goto e_inval;
goto e_rpf;
*spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
*itag = 0;
return 0;
@@ -308,6 +308,8 @@ e_inval_res:
fib_res_put(&res);
e_inval:
return -EINVAL;
e_rpf:
return -EXDEV;
}
static inline __be32 sk_extract_addr(struct sockaddr *addr)