From e6afc8ace6dd5cef5e812f26c72579da8806f5ac Mon Sep 17 00:00:00 2001 From: samanthakumar Date: Tue, 5 Apr 2016 12:41:15 -0400 Subject: udp: remove headers from UDP packets before queueing 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 Signed-off-by: Willem de Bruijn Signed-off-by: David S. Miller --- net/ipv4/udp.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) (limited to 'net/ipv4/udp.c') diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 355bdb221057..cf747e86ce52 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -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); -- cgit v1.2.3