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udp: add support for UDP_GRO cmsg

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When UDP GRO is enabled, the UDP_GRO cmsg will carry the ingress
datagram size. User-space can use such info to compute the original
packets layout.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni
2018-11-07 12:38:30 +01:00
committed by David S. Miller
parent e20cf8d3f1
commit bcd1665e35
3 changed files with 18 additions and 0 deletions
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4
net/ipv4/udp.c
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@@ -1711,6 +1711,10 @@ try_again:
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
*addr_len = sizeof(*sin);
}
if (udp_sk(sk)->gro_enabled)
udp_cmsg_recv(msg, sk, skb);
if (inet->cmsg_flags)
ip_cmsg_recv_offset(msg, sk, skb, sizeof(struct udphdr), off);