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udp: remove headers from UDP packets before queueing

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Remove UDP transport headers before queueing packets for reception.
This change simplifies a follow-up patch to add MSG_PEEK support.

Signed-off-by: Sam Kumar <samanthakumar@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
samanthakumar
2016-04-05 12:41:15 -04:00
committed by David S. Miller
parent b9bb53f383
commit e6afc8ace6
5 changed files with 41 additions and 20 deletions
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20
net/ipv4/udp.c
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@@ -1309,7 +1309,7 @@ try_again:
if (!skb)
goto out;
ulen = skb->len - sizeof(struct udphdr);
ulen = skb->len;
copied = len;
if (copied > ulen)
copied = ulen;
@@ -1329,11 +1329,9 @@ try_again:
}
if (checksum_valid || skb_csum_unnecessary(skb))
err = skb_copy_datagram_msg(skb, sizeof(struct udphdr),
msg, copied);
err = skb_copy_datagram_msg(skb, 0, msg, copied);
else {
err = skb_copy_and_csum_datagram_msg(skb, sizeof(struct udphdr),
msg);
err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
if (err == -EINVAL)
goto csum_copy_err;
@@ -1500,7 +1498,7 @@ static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
sk_incoming_cpu_update(sk);
}
rc = sock_queue_rcv_skb(sk, skb);
rc = __sock_queue_rcv_skb(sk, skb);
if (rc < 0) {
int is_udplite = IS_UDPLITE(sk);
@@ -1616,10 +1614,14 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
}
}
if (rcu_access_pointer(sk->sk_filter) &&
udp_lib_checksum_complete(skb))
goto csum_error;
if (rcu_access_pointer(sk->sk_filter)) {
if (udp_lib_checksum_complete(skb))
goto csum_error;
if (sk_filter(sk, skb))
goto drop;
}
udp_csum_pull_header(skb);
if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
is_udplite);