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net: fix IPSTATS_MIB_OUTFORWDATAGRAMS increment after fragment check

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Reproduce environment:
network with 3 VM linuxs is connected as below:
VM1<---->VM2(latest kernel 6.5.0-rc7)<---->VM3
VM1: eth0 ip: 192.168.122.207 MTU 1800
VM2: eth0 ip: 192.168.122.208, eth1 ip: 192.168.123.224 MTU 1500
VM3: eth0 ip: 192.168.123.240 MTU 1800

Reproduce:
VM1 send 1600 bytes UDP data to VM3 using tools scapy with flags='DF'.
scapy command:
send(IP(dst="192.168.123.240",flags='DF')/UDP()/str('0'*1600),count=1,
inter=1.000000)

Result:
Before IP data is sent.
----------------------------------------------------------------------
root@qemux86-64:~# cat /proc/net/snmp
Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors
    ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests
    OutDiscards OutNoRoutes ReasmTimeout ReasmReqdss
Ip: 1 64 6 0 2 2 0 0 2 4 0 0 0 0 0 0 0 0 0
......
root@qemux86-64:~#
----------------------------------------------------------------------
After IP data is sent.
----------------------------------------------------------------------
root@qemux86-64:~# cat /proc/net/snmp
Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors
    ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests
    OutDiscards OutNoRoutes ReasmTimeout ReasmReqdss
Ip: 1 64 7 0 2 2 0 0 2 5 0 0 0 0 0 0 0 1 0
......
root@qemux86-64:~#
----------------------------------------------------------------------
ForwDatagrams is always keeping 2 without increment.

Issue description and patch:
ip_exceeds_mtu() in ip_forward() drops this IP datagram because skb len
(1600 sending by scapy) is over MTU(1500 in VM2) if "DF" is set.
According to RFC 4293 "3.2.3. IP Statistics Tables",
  +-------+------>------+----->-----+----->-----+
  | InForwDatagrams (6) | OutForwDatagrams (6)  |
  |                     V                       +->-+ OutFragReqds
  |                 InNoRoutes                  |   | (packets)
  / (local packet (3)                           |   |
  |  IF is that of the address                  |   +--> OutFragFails
  |  and may not be the receiving IF)           |   |    (packets)
the IPSTATS_MIB_OUTFORWDATAGRAMS should be counted before fragment
check.
The existing implementation, instead, would incease the counter after
fragment check: ip_exceeds_mtu() in ipv4 and ip6_pkt_too_big() in ipv6.
So do patch to move IPSTATS_MIB_OUTFORWDATAGRAMS counter to ip_forward()
for ipv4 and ip6_forward() for ipv6.

Test result with patch:
Before IP data is sent.
----------------------------------------------------------------------
root@qemux86-64:~# cat /proc/net/snmp
Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors
    ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests
    OutDiscards OutNoRoutes ReasmTimeout ReasmReqdss
Ip: 1 64 6 0 2 2 0 0 2 4 0 0 0 0 0 0 0 0 0
......
root@qemux86-64:~#
----------------------------------------------------------------------
After IP data is sent.
----------------------------------------------------------------------
root@qemux86-64:~# cat /proc/net/snmp
Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors
    ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests
    OutDiscards OutNoRoutes ReasmTimeout ReasmReqdss
Ip: 1 64 7 0 2 3 0 0 2 5 0 0 0 0 0 0 0 1 0
......
root@qemux86-64:~#
----------------------------------------------------------------------
ForwDatagrams is updated from 2 to 3.

Reviewed-by: Filip Pudak <filip.pudak@windriver.com>
Signed-off-by: Heng Guo <heng.guo@windriver.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20231011015137.27262-1-heng.guo@windriver.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Heng Guo 2023-10-11 09:51:37 +08:00 committed by Jakub Kicinski
parent 1bc60524ca
commit cf8b49fbd0
2 changed files with 4 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
net/ipv4/ip_forward.c
View file

@ -66,8 +66,6 @@ static int ip_forward_finish(struct net *net, struct sock *sk, struct sk_buff *s
{
struct ip_options *opt = &(IPCB(skb)->opt);
__IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
#ifdef CONFIG_NET_SWITCHDEV
if (skb->offload_l3_fwd_mark) {
consume_skb(skb);
@ -130,6 +128,8 @@ int ip_forward(struct sk_buff *skb)
if (opt->is_strictroute && rt->rt_uses_gateway)
goto sr_failed;
__IP_INC_STATS(net, IPSTATS_MIB_OUTFORWDATAGRAMS);
IPCB(skb)->flags |= IPSKB_FORWARDED;
mtu = ip_dst_mtu_maybe_forward(&rt->dst, true);
if (ip_exceeds_mtu(skb, mtu)) {

6
net/ipv6/ip6_output.c
View file

@ -446,10 +446,6 @@ static int ip6_forward_proxy_check(struct sk_buff *skb)
static inline int ip6_forward_finish(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
__IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
#ifdef CONFIG_NET_SWITCHDEV
if (skb->offload_l3_fwd_mark) {
consume_skb(skb);
@ -617,6 +613,8 @@ int ip6_forward(struct sk_buff *skb)
}
}
__IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
mtu = ip6_dst_mtu_maybe_forward(dst, true);
if (mtu < IPV6_MIN_MTU)
mtu = IPV6_MIN_MTU;