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bpf: Verify flags in bpf_fib_lookup 

Verify flags argument contains only known flags. Allows programs to probe
for support as more are added.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
David Ahern 2018-05-29 11:59:13 -07:00 committed by Daniel Borkmann
parent fa898d769b
commit 9ce64f192d
1 changed files with 6 additions and 0 deletions
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6
net/core/filter.c
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@ -4270,6 +4270,9 @@ BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
if (plen < sizeof(*params))
return -EINVAL;
if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
return -EINVAL;
switch (params->family) {
#if IS_ENABLED(CONFIG_INET)
case AF_INET:
@ -4304,6 +4307,9 @@ BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
if (plen < sizeof(*params))
return -EINVAL;
if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
return -EINVAL;
switch (params->family) {
#if IS_ENABLED(CONFIG_INET)
case AF_INET: