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ipv4: add description about martian source

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When multiple containers are running in the environment and multiple
macvlan network port are configured in each container, a lot of martian
source prints will appear after martian_log is enabled. they are almost
the same, and printed by net_warn_ratelimited. Each arp message will
trigger this print on each network port.

Such as:
IPv4: martian source 173.254.95.16 from 173.254.100.109,
on dev eth0
ll header: 00000000: ff ff ff ff ff ff 40 00 ad fe 64 6d
08 06        ......@...dm..
IPv4: martian source 173.254.95.16 from 173.254.100.109,
on dev eth1
ll header: 00000000: ff ff ff ff ff ff 40 00 ad fe 64 6d
08 06        ......@...dm..

There is no description of this kind of source in the RFC1812.

Signed-off-by: Zhang Yunkai <zhang.yunkai@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zhang Yunkai 2022-02-14 03:27:21 +00:00 committed by David S. Miller
parent 2520611151
commit 9d2d38c35e
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/fib_frontend.c
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@ -436,6 +436,9 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
if (net->ipv4.fib_has_custom_local_routes ||
fib4_has_custom_rules(net))
goto full_check;
/* Within the same container, it is regarded as a martian source,
* and the same host but different containers are not.
*/
if (inet_lookup_ifaddr_rcu(net, src))
return -EINVAL;