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ip: Add offset parameter to ip_cmsg_recv

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Add ip_cmsg_recv_offset function which takes an offset argument
that indicates the starting offset in skb where data is being received
from. This will be useful in the case of UDP and provided checksum
to user space.

ip_cmsg_recv is an inline call to ip_cmsg_recv_offset with offset of
zero.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2015-01-05 13:56:17 -08:00
committed by David S. Miller
parent 5961de9f19
commit ad6f939ab1
4 changed files with 43 additions and 2 deletions
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2
net/ipv4/udp.c
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@@ -1329,7 +1329,7 @@ try_again:
*addr_len = sizeof(*sin);
}
if (inet->cmsg_flags)
ip_cmsg_recv(msg, skb);
ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));
err = copied;
if (flags & MSG_TRUNC)