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fib_rules: return 0 directly if an exactly same rule exists when NLM_…
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…F_EXCL not supplied

With commit 153380e ("fib_rules: Added NLM_F_EXCL support to
fib_nl_newrule") we now able to check if a rule already exists. But this
only works with iproute2. For other tools like libnl, NetworkManager,
it still could add duplicate rules with only NLM_F_CREATE flag, like

[localhost ~ ]# ip rule
0:      from all lookup local
32766:  from all lookup main
32767:  from all lookup default
100000: from 192.168.7.5 lookup 5
100000: from 192.168.7.5 lookup 5

As it doesn't make sense to create two duplicate rules, let's just return
0 if the rule exists.

Fixes: 153380e ("fib_rules: Added NLM_F_EXCL support to fib_nl_newrule")
Reported-by: Thomas Haller <thaller@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Hangbin Liu authored and David S. Miller committed May 8, 2019
1 parent 80f2321 commit e9919a2
Showing 1 changed file with 3 additions and 3 deletions.
6 changes: 3 additions & 3 deletions net/core/fib_rules.c
Original file line number Diff line number Diff line change
Expand Up @@ -757,9 +757,9 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh,
if (err)
goto errout;

if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
rule_exists(ops, frh, tb, rule)) {
err = -EEXIST;
if (rule_exists(ops, frh, tb, rule)) {
if (nlh->nlmsg_flags & NLM_F_EXCL)
err = -EEXIST;
goto errout_free;
}

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