From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
To: netdev@vger.kernel.org
Cc: davem@davemloft.net, samanthakumar@google.com,
edumazet@google.com, willemb@google.com
Subject: [PATCH net-next v2 2/3] udp: remove headers from UDP packets before queueing
Date: Tue, 5 Apr 2016 12:41:15 -0400 [thread overview]
Message-ID: <1459874476-92838-3-git-send-email-willemdebruijn.kernel@gmail.com> (raw)
In-Reply-To: <1459874476-92838-1-git-send-email-willemdebruijn.kernel@gmail.com>
From: samanthakumar <samanthakumar@google.com>
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>
---
include/net/sock.h | 1 +
include/net/udp.h | 9 +++++++++
net/core/sock.c | 19 +++++++++++++------
net/ipv4/udp.c | 20 +++++++++++---------
net/ipv6/udp.c | 12 +++++++-----
5 files changed, 41 insertions(+), 20 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 09aec75..b759989 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1864,6 +1864,7 @@ void sk_reset_timer(struct sock *sk, struct timer_list *timer,
void sk_stop_timer(struct sock *sk, struct timer_list *timer);
+int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);
diff --git a/include/net/udp.h b/include/net/udp.h
index d870ec1..a0b0da9 100644
--- a/include/net/udp.h
+++ b/include/net/udp.h
@@ -158,6 +158,15 @@ static inline __sum16 udp_v4_check(int len, __be32 saddr,
void udp_set_csum(bool nocheck, struct sk_buff *skb,
__be32 saddr, __be32 daddr, int len);
+static inline void udp_csum_pull_header(struct sk_buff *skb)
+{
+ if (skb->ip_summed == CHECKSUM_NONE)
+ skb->csum = csum_partial(udp_hdr(skb), sizeof(struct udphdr),
+ skb->csum);
+ skb_pull_rcsum(skb, sizeof(struct udphdr));
+ UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
+}
+
struct sk_buff **udp_gro_receive(struct sk_buff **head, struct sk_buff *skb,
struct udphdr *uh);
int udp_gro_complete(struct sk_buff *skb, int nhoff);
diff --git a/net/core/sock.c b/net/core/sock.c
index 2f517ea..e12197b 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -402,9 +402,8 @@ static void sock_disable_timestamp(struct sock *sk, unsigned long flags)
}
-int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
- int err;
unsigned long flags;
struct sk_buff_head *list = &sk->sk_receive_queue;
@@ -414,10 +413,6 @@ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
return -ENOMEM;
}
- err = sk_filter(sk, skb);
- if (err)
- return err;
-
if (!sk_rmem_schedule(sk, skb, skb->truesize)) {
atomic_inc(&sk->sk_drops);
return -ENOBUFS;
@@ -440,6 +435,18 @@ int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
sk->sk_data_ready(sk);
return 0;
}
+EXPORT_SYMBOL(__sock_queue_rcv_skb);
+
+int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+ int err;
+
+ err = sk_filter(sk, skb);
+ if (err)
+ return err;
+
+ return __sock_queue_rcv_skb(sk, skb);
+}
EXPORT_SYMBOL(sock_queue_rcv_skb);
int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 355bdb2..cf747e8 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);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 78a7dfd..84c8d7b 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -376,7 +376,7 @@ try_again:
if (!skb)
goto out;
- ulen = skb->len - sizeof(struct udphdr);
+ ulen = skb->len;
copied = len;
if (copied > ulen)
copied = ulen;
@@ -398,10 +398,9 @@ 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;
}
@@ -554,7 +553,7 @@ static int __udpv6_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);
@@ -648,8 +647,11 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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)) {
UDP6_INC_STATS_BH(sock_net(sk),
UDP_MIB_RCVBUFERRORS, is_udplite);
--
2.8.0.rc3.226.g39d4020
next prev parent reply other threads:[~2016-04-05 16:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-05 16:41 [PATCH net-next v2 0/3] udp: support SO_PEEK_OFF Willem de Bruijn
2016-04-05 16:41 ` [PATCH net-next v2 1/3] sock: convert sk_peek_offset functions to WRITE_ONCE Willem de Bruijn
2016-04-05 16:41 ` Willem de Bruijn [this message]
2016-04-05 16:41 ` [PATCH net-next v2 3/3] udp: enable MSG_PEEK at non-zero offset Willem de Bruijn
2016-04-05 20:29 ` [PATCH net-next v2 0/3] udp: support SO_PEEK_OFF David Miller
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