[PATCH 4.4 24/34] udp: fix IP_CHECKSUM handling

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <eduma...@google.com>


[ Upstream commit 10df8e6152c6c400a563a673e9956320bfce1871 ]

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 ip_cmsg_recv(msg, skb) should have been replaced by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 <eduma...@google.com>
Cc: Sam Kumar <samanthaku...@google.com>
Cc: Willem de Bruijn <will...@google.com>
Tested-by: Willem de Bruijn <will...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 include/net/ip.h       |    4 ++--
 net/ipv4/ip_sockglue.c |   10 ++++++----
 net/ipv4/udp.c         |    2 +-
 net/ipv6/udp.c         |    3 ++-
 4 files changed, 11 insertions(+), 8 deletions(-)

--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -553,7 +553,7 @@ int ip_options_rcv_srr(struct sk_buff *s
  */
 
 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 net *net, struct msghdr *msg,
                 struct ipcm_cookie *ipc, bool allow_ipv6);
 int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval,
@@ -575,7 +575,7 @@ void ip_local_error(struct sock *sk, int
 
 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);
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -98,7 +98,7 @@ static void ip_cmsg_recv_retopts(struct
 }
 
 static void ip_cmsg_recv_checksum(struct msghdr *msg, struct sk_buff *skb,
-                                 int offset)
+                                 int tlen, int offset)
 {
        __wsum csum = skb->csum;
 
@@ -106,7 +106,9 @@ static void ip_cmsg_recv_checksum(struct
                return;
 
        if (offset != 0)
-               csum = csum_sub(csum, csum_partial(skb->data, offset, 0));
+               csum = csum_sub(csum,
+                               csum_partial(skb->data + tlen,
+                                            offset, 0));
 
        put_cmsg(msg, SOL_IP, IP_CHECKSUM, sizeof(__wsum), &csum);
 }
@@ -152,7 +154,7 @@ static void ip_cmsg_recv_dstaddr(struct
 }
 
 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;
@@ -215,7 +217,7 @@ void ip_cmsg_recv_offset(struct msghdr *
        }
 
        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);
 
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1342,7 +1342,7 @@ try_again:
                *addr_len = sizeof(*sin);
        }
        if (inet->cmsg_flags)
-               ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr));
+               ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr), off);
 
        err = copied;
        if (flags & MSG_TRUNC)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -498,7 +498,8 @@ try_again:
 
        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);