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bpf: Change bpf_fib_lookup to return -EAFNOSUPPORT for unsupported address families

PATCH Applied [email protected] 2 participants 2 messages May 30, 2018

Subsystems (4)
Networking Network drivers BPF BPF networking
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PATCH 1/1 bpf: Change bpf_fib_lookup to return -EAFNOSUPPORT for unsupported address families

From: David Ahern <[email protected]>

Update bpf_fib_lookup to return -EAFNOSUPPORT for unsupported address families. Allows userspace to probe for support as more are added (e.g., AF_MPLS).

Signed-off-by David Ahern <[email protected]>
---
 net/core/filter.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
net/core/filter.c +2 -2
index 4cff6d9cd724..a2b96e44b2c1 100644
@@ -4285,7 +4285,7 @@ BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
 					   flags, true);
 #endif
 	}
-	return 0;
+	return -EAFNOSUPPORT;
 }
 
 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {

@@ -4302,7 +4302,7 @@ BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
 	   struct bpf_fib_lookup *, params, int, plen, u32, flags)
 {
 	struct net *net = dev_net(skb->dev);
-	int index = 0;
+	int index = -EAFNOSUPPORT;
 
 	if (plen < sizeof(*params))
 		return -EINVAL;
Signature · 1 line
2.11.0