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* [PATCH net] udp: fix IP_CHECKSUM handling
@ 2016-10-24  1:03 Eric Dumazet
  2016-10-25 19:43 ` Willem de Bruijn
  2016-10-26 21:34 ` David Miller
  0 siblings, 2 replies; 4+ messages in thread
From: Eric Dumazet @ 2016-10-24  1:03 UTC (permalink / raw)
  To: David Miller; +Cc: netdev, Sam Kumar, Willem de Bruijn, Tom Herbert

From: Eric Dumazet <edumazet@google.com>

First bug was added in commit ad6f939ab193 ("ip: Add offset parameter to
ip_cmsg_recv") : Tom missed that ipv4 udp messages could be received on
AF_INET6 socket. ip_cmsg_recv(msg, skb) should have been replaced by
ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));

Then commit e6afc8ace6dd ("udp: remove headers from UDP packets before
queueing") forgot to adjust the offsets now UDP headers are pulled
before skb are put in receive queue.

Fixes: ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv")
Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Sam Kumar <samanthakumar@google.com>
Cc: Willem de Bruijn <willemb@google.com>
---
Tom, I would appreciate your feedback on this patch, I presume
you have tests to verify IP_CHECKSUM feature ? Thanks !

 include/net/ip.h       |    4 ++--
 net/ipv4/ip_sockglue.c |   11 ++++++-----
 net/ipv4/udp.c         |    2 +-
 net/ipv6/udp.c         |    3 ++-
 4 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/include/net/ip.h b/include/net/ip.h
index c9d07988911e..5413883ac47f 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -578,7 +578,7 @@ int ip_options_rcv_srr(struct sk_buff *skb);
  */
 
 void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
-void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset);
+void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int tlen, int offset);
 int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
 		 struct ipcm_cookie *ipc, bool allow_ipv6);
 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
@@ -600,7 +600,7 @@ void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
 
 static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
 {
-	ip_cmsg_recv_offset(msg, skb, 0);
+	ip_cmsg_recv_offset(msg, skb, 0, 0);
 }
 
 bool icmp_global_allow(void);
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index af4919792b6a..b8a2d63d1fb8 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -98,7 +98,7 @@ static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
 }
 
 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
-				  int offset)
+				  int tlen, int offset)
 {
 	__wsum csum = skb->csum;
 
@@ -106,8 +106,9 @@ static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
 		return;
 
 	if (offset != 0)
-		csum = csum_sub(csum, csum_partial(skb_transport_header(skb),
-						   offset, 0));
+		csum = csum_sub(csum,
+				csum_partial(skb_transport_header(skb) + tlen,
+					     offset, 0));
 
 	put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
 }
@@ -153,7 +154,7 @@ static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
 }
 
 void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
-			 int offset)
+			 int tlen, int offset)
 {
 	struct inet_sock *inet = inet_sk(skb->sk);
 	unsigned int flags = inet->cmsg_flags;
@@ -216,7 +217,7 @@ void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb,
 	}
 
 	if (flags & IP_CMSG_CHECKSUM)
-		ip_cmsg_recv_checksum(msg, skb, offset);
+		ip_cmsg_recv_checksum(msg, skb, tlen, offset);
 }
 EXPORT_SYMBOL(ip_cmsg_recv_offset);
 
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 311613e413cb..d123d68f4d1d 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1322,7 +1322,7 @@ int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
 		*addr_len = sizeof(*sin);
 	}
 	if (inet->cmsg_flags)
-		ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr) + off);
+		ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr), off);
 
 	err = copied;
 	if (flags & MSG_TRUNC)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 9aa7c1c7a9ce..b2ef061e6836 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -427,7 +427,8 @@ int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 
 	if (is_udp4) {
 		if (inet->cmsg_flags)
-			ip_cmsg_recv(msg, skb);
+			ip_cmsg_recv_offset(msg, skb,
+					    sizeof(struct udphdr), off);
 	} else {
 		if (np->rxopt.all)
 			ip6_datagram_recv_specific_ctl(sk, msg, skb);

^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [PATCH net] udp: fix IP_CHECKSUM handling
  2016-10-24  1:03 [PATCH net] udp: fix IP_CHECKSUM handling Eric Dumazet
@ 2016-10-25 19:43 ` Willem de Bruijn
  2016-10-25 20:05   ` Eric Dumazet
  2016-10-26 21:34 ` David Miller
  1 sibling, 1 reply; 4+ messages in thread
From: Willem de Bruijn @ 2016-10-25 19:43 UTC (permalink / raw)
  To: Eric Dumazet
  Cc: David Miller, netdev, Sam Kumar, Willem de Bruijn, Tom Herbert

On Sun, Oct 23, 2016 at 9:03 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> From: Eric Dumazet <edumazet@google.com>
>
> First bug was added in commit ad6f939ab193 ("ip: Add offset parameter to
> ip_cmsg_recv") : Tom missed that ipv4 udp messages could be received on
> AF_INET6 socket. ip_cmsg_recv(msg, skb) should have been replaced by
> ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));
>
> Then commit e6afc8ace6dd ("udp: remove headers from UDP packets before
> queueing") forgot to adjust the offsets now UDP headers are pulled
> before skb are put in receive queue.
>
> Fixes: ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv")
> Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Cc: Sam Kumar <samanthakumar@google.com>
> Cc: Willem de Bruijn <willemb@google.com>
> ---
> Tom, I would appreciate your feedback on this patch, I presume
> you have tests to verify IP_CHECKSUM feature ? Thanks !
>

Tested-by: Willem de Bruijn <willemb@google.com>

Thanks for fixing, Eric.

Tested with https://github.com/wdebruij/kerneltools/blob/master/tests/recv_cmsg_ipchecksum.c

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH net] udp: fix IP_CHECKSUM handling
  2016-10-25 19:43 ` Willem de Bruijn
@ 2016-10-25 20:05   ` Eric Dumazet
  0 siblings, 0 replies; 4+ messages in thread
From: Eric Dumazet @ 2016-10-25 20:05 UTC (permalink / raw)
  To: Willem de Bruijn
  Cc: David Miller, netdev, Sam Kumar, Willem de Bruijn, Tom Herbert

On Tue, 2016-10-25 at 15:43 -0400, Willem de Bruijn wrote:
> On Sun, Oct 23, 2016 at 9:03 PM, Eric Dumazet <eric.dumazet@gmail.com> wrote:
> > From: Eric Dumazet <edumazet@google.com>
> >
> > First bug was added in commit ad6f939ab193 ("ip: Add offset parameter to
> > ip_cmsg_recv") : Tom missed that ipv4 udp messages could be received on
> > AF_INET6 socket. ip_cmsg_recv(msg, skb) should have been replaced by
> > ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));
> >
> > Then commit e6afc8ace6dd ("udp: remove headers from UDP packets before
> > queueing") forgot to adjust the offsets now UDP headers are pulled
> > before skb are put in receive queue.
> >
> > Fixes: ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv")
> > Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
> > Signed-off-by: Eric Dumazet <edumazet@google.com>
> > Cc: Sam Kumar <samanthakumar@google.com>
> > Cc: Willem de Bruijn <willemb@google.com>
> > ---
> > Tom, I would appreciate your feedback on this patch, I presume
> > you have tests to verify IP_CHECKSUM feature ? Thanks !
> >
> 
> Tested-by: Willem de Bruijn <willemb@google.com>
> 
> Thanks for fixing, Eric.
> 
> Tested with https://github.com/wdebruij/kerneltools/blob/master/tests/recv_cmsg_ipchecksum.c

Thanks a lot Willem for cooking this test !

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH net] udp: fix IP_CHECKSUM handling
  2016-10-24  1:03 [PATCH net] udp: fix IP_CHECKSUM handling Eric Dumazet
  2016-10-25 19:43 ` Willem de Bruijn
@ 2016-10-26 21:34 ` David Miller
  1 sibling, 0 replies; 4+ messages in thread
From: David Miller @ 2016-10-26 21:34 UTC (permalink / raw)
  To: eric.dumazet; +Cc: netdev, samanthakumar, willemb, tom

From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Sun, 23 Oct 2016 18:03:06 -0700

> From: Eric Dumazet <edumazet@google.com>
> 
> First bug was added in commit ad6f939ab193 ("ip: Add offset parameter to
> ip_cmsg_recv") : Tom missed that ipv4 udp messages could be received on
> AF_INET6 socket. ip_cmsg_recv(msg, skb) should have been replaced by
> ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));
> 
> Then commit e6afc8ace6dd ("udp: remove headers from UDP packets before
> queueing") forgot to adjust the offsets now UDP headers are pulled
> before skb are put in receive queue.
> 
> Fixes: ad6f939ab193 ("ip: Add offset parameter to ip_cmsg_recv")
> Fixes: e6afc8ace6dd ("udp: remove headers from UDP packets before queueing")
> Signed-off-by: Eric Dumazet <edumazet@google.com>

Applied and queued up for -stable, thanks Eric.

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2016-10-26 21:34 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2016-10-24  1:03 [PATCH net] udp: fix IP_CHECKSUM handling Eric Dumazet
2016-10-25 19:43 ` Willem de Bruijn
2016-10-25 20:05   ` Eric Dumazet
2016-10-26 21:34 ` David Miller

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