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Commit 9ce64f19 authored by David Ahern's avatar David Ahern Committed by Daniel Borkmann
Browse files

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: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent fa898d76

net/core/filter.c

+6 −0
Original line number Diff line number Diff line
@@ -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: