[PATCH net v3 0/3] ipv6: udp6: set dst cache for a connected sk if current not valid

A new RTF_CACHE route can be created with the socket's dst cache
update between the below calls in udpv6_sendmsg(), when datagram
sending results to ICMPV6_PKT_TOOBIG error:

   dst = ip6_sk_dst_lookup_flow(...)
   ...
release_dst:
    if (dst) {
        if (connected)
            ip6_dst_store(sk, dst)

Therefore, the new socket's dst cache reset to the old one on
"release_dst:".

The first two patches prepare the code to store dst cache
with ip6_sk_dst_lookup_flow() in udpv6_sendmsg():

  * the first patch adds new wrapper ip6_dst_store_flow() to
    increase readability of the code and the changes.

  * the second patch adds new argument to ip6_sk_dst_lookup_flow()
    and ability to store dst in the socket's cache. Also, the two
    users of the function are updated without enabling the new
    behavior: pingv6_sendmsg() and udpv6_sendmsg().

The last patch contains the actual fix that removes sk dst cache
update in the end of udpv6_sendmsg(), and allows to do it in
ip6_sk_dst_lookup_flow().

v3: * instead of moving ip6_dst_store() above udp_v6_send_skb(),
      update socket's dst cache inside ip6_sk_dst_lookup_flow()
      if the current one is invalid.
    * the issue not reproduced in 4.1, but starting from 4.2. Add
      one more 'Fixes:' commit that creates new RTF_CACHE route.
      Though, it is also mentioned in the first one.

Alexey Kodanev (3):
  ipv6: move ip6_dst_store() calls with flowi6 checks to a wrapper
  ipv6: allow to cache dst for connected sk in ip6_sk_dst_lookup_flow()
  ipv6: udp6: set dst cache for a connected sk if current not valid

 include/net/ip6_route.h | 17 +++++++++++++++++
 include/net/ipv6.h      |  3 ++-
 net/ipv6/datagram.c     |  9 +--------
 net/ipv6/ip6_output.c   | 15 ++++++++++++---
 net/ipv6/ping.c         |  2 +-
 net/ipv6/udp.c          | 21 ++-------------------
 6 files changed, 35 insertions(+), 32 deletions(-)

-- 
1.8.3.1

Add 'connected' argument to ip6_sk_dst_lookup_flow() and
update the cache only if ip6_sk_dst_check() returns NULL
and a socket is connected.

The function is used as before, the new behavior for UDP
sockets in udpv6_sendmsg() will be enabled in the next
patch.

Signed-off-by: Alexey Kodanev <redacted>
---
 include/net/ipv6.h    |  3 ++-
 net/ipv6/ip6_output.c | 15 ++++++++++++---
 net/ipv6/ping.c       |  2 +-
 net/ipv6/udp.c        |  2 +-
 4 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 8606c91..07e94dc 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h

@@ -977,7 +977,8 @@ int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
 struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
 				      const struct in6_addr *final_dst);
 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
-					 const struct in6_addr *final_dst);
+					 const struct in6_addr *final_dst,
+					 int connected);
 struct dst_entry *ip6_blackhole_route(struct net *net,
 				      struct dst_entry *orig_dst);
 

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index a8a9195..c22017c 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c

@@ -1105,23 +1105,32 @@ struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
  *	@sk: socket which provides the dst cache and route info
  *	@fl6: flow to lookup
  *	@final_dst: final destination address for ipsec lookup
+ *	@connected: whether @sk is connected or not
  *
  *	This function performs a route lookup on the given flow with the
  *	possibility of using the cached route in the socket if it is valid.
  *	It will take the socket dst lock when operating on the dst cache.
  *	As a result, this function can only be used in process context.
  *
+ *	In addition, for a connected socket, cache the dst in the socket
+ *	if the current cache is not valid.
+ *
  *	It returns a valid dst pointer on success, or a pointer encoded
  *	error code.
  */
 struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi6 *fl6,
-					 const struct in6_addr *final_dst)
+					 const struct in6_addr *final_dst,
+					 int connected)
 {
 	struct dst_entry *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
 
 	dst = ip6_sk_dst_check(sk, dst, fl6);
-	if (!dst)
-		dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
+	if (dst)
+		return dst;
+
+	dst = ip6_dst_lookup_flow(sk, fl6, final_dst);
+	if (connected && !IS_ERR(dst))
+		ip6_dst_store_flow(sk, dst_clone(dst), fl6);
 
 	return dst;
 }

diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index d12c55d..546f4a6 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c

@@ -121,7 +121,7 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	ipc6.tclass = np->tclass;
 	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
 
-	dst = ip6_sk_dst_lookup_flow(sk, &fl6,  daddr);
+	dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, 0);
 	if (IS_ERR(dst))
 		return PTR_ERR(dst);
 	rt = (struct rt6_info *) dst;

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 52e3ea0..e49dac4 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c

@@ -1289,7 +1289,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
 	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
 
-	dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p);
+	dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, 0);
 	if (IS_ERR(dst)) {
 		err = PTR_ERR(dst);
 		dst = NULL;

-- 
1.8.3.1

Move commonly used pattern of ip6_dst_store() usage to a separate
function - ip6_dst_store_flow(), which will check the addresses
for equality before saving them.

There is no functional changes in this patch, the new wrapper
will be used in the next patch, in ip6_sk_dst_lookup_flow().

Signed-off-by: Alexey Kodanev <redacted>
---
 include/net/ip6_route.h | 17 +++++++++++++++++
 net/ipv6/datagram.c     |  9 +--------
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index ac0866b..36c3946 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h

@@ -210,6 +210,23 @@ static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 #endif
 }
 
+static inline void ip6_dst_store_flow(struct sock *sk, struct dst_entry *dst,
+				      struct flowi6 *fl6)
+{
+#ifdef CONFIG_IPV6_SUBTREES
+	struct ipv6_pinfo *np = inet6_sk(sk);
+#endif
+
+	ip6_dst_store(sk, dst,
+		      ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
+		      &sk->sk_v6_daddr : NULL,
+#ifdef CONFIG_IPV6_SUBTREES
+		      ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
+		      &np->saddr :
+#endif
+		      NULL);
+}
+
 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 {
 	struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);

diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index a9f7eca..8b4fa0c 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c

@@ -106,14 +106,7 @@ int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr)
 		}
 	}
 
-	ip6_dst_store(sk, dst,
-		      ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
-		      &sk->sk_v6_daddr : NULL,
-#ifdef CONFIG_IPV6_SUBTREES
-		      ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
-		      &np->saddr :
-#endif
-		      NULL);
+	ip6_dst_store_flow(sk, dst, &fl6);
 
 out:
 	fl6_sock_release(flowlabel);

-- 
1.8.3.1

A new RTF_CACHE route can be created in udpv6_sendmsg() between
ip6_sk_dst_lookup_flow() and ip6_dst_store() calls when datagram
sending results to ICMPV6_PKT_TOOBIG error:

    udp_v6_send_skb(), for example with vti6 tunnel:
        vti6_xmit(), get ICMPV6_PKT_TOOBIG error
            skb_dst_update_pmtu(), can create a RTF_CACHE clone
            icmpv6_send()
    ...
    udpv6_err()
        ip6_sk_update_pmtu()
           ip6_update_pmtu(), can create a RTF_CACHE clone
           ...
           ip6_datagram_dst_update()
                ip6_dst_store()

And after commit 33c162a980fe ("ipv6: datagram: Update dst cache
of a connected datagram sk during pmtu update"), the UDPv6 error
handler can update socket's dst cache, but it can happen before
the update in end of udpv6_sendmsg(), preventing getting updated
dst cache on the next udpv6_sendmsg() calls.

In order to fix it, we should save dst for a connected socket
in udpv6_sendmsg(), only if the previous socket's cache is not
valid.

Fixes: 33c162a980fe ("ipv6: datagram: Update dst cache of a connected datagram sk during pmtu update")
Fixes: 45e4fd26683c ("ipv6: Only create RTF_CACHE routes after encountering pmtu exception")
Signed-off-by: Alexey Kodanev <redacted>
---
 net/ipv6/udp.c | 21 ++-------------------
 1 file changed, 2 insertions(+), 19 deletions(-)

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index e49dac4..da13c90 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c

@@ -1289,7 +1289,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 
 	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
 
-	dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, 0);
+	dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected);
 	if (IS_ERR(dst)) {
 		err = PTR_ERR(dst);
 		dst = NULL;

@@ -1314,7 +1314,7 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 		err = PTR_ERR(skb);
 		if (!IS_ERR_OR_NULL(skb))
 			err = udp_v6_send_skb(skb, &fl6);
-		goto release_dst;
+		goto out;
 	}
 
 	lock_sock(sk);

@@ -1348,23 +1348,6 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 		err = np->recverr ? net_xmit_errno(err) : 0;
 	release_sock(sk);
 
-release_dst:
-	if (dst) {
-		if (connected) {
-			ip6_dst_store(sk, dst,
-				      ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ?
-				      &sk->sk_v6_daddr : NULL,
-#ifdef CONFIG_IPV6_SUBTREES
-				      ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
-				      &np->saddr :
-#endif
-				      NULL);
-		} else {
-			dst_release(dst);
-		}
-		dst = NULL;
-	}
-
 out:
 	dst_release(dst);
 	fl6_sock_release(flowlabel);

-- 
1.8.3.1

Hi Alexey,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net/master]

url:    https://github.com/0day-ci/linux/commits/Alexey-Kodanev/ipv6-move-ip6_dst_store-calls-with-flowi6-checks-to-a-wrapper/20180330-173050
config: ia64-defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/tcp.h:23:0,
                    from include/linux/ipv6.h:87,
                    from include/net/ipv6.h:16,
                    from include/net/inetpeer.h:16,
                    from include/net/route.h:28,
                    from drivers/infiniband/core/addr.c:43:
   include/net/ip6_route.h: In function 'ip6_dst_store_flow':
   include/net/sock.h:349:34: error: 'struct sock_common' has no member named 'skc_v6_daddr'; did you mean 'skc_daddr'?
    #define sk_v6_daddr  __sk_common.skc_v6_daddr
                                     ^

quoted

include/net/ip6_route.h:221:43: note: in expansion of macro 'sk_v6_daddr'

            ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
                                              ^~~~~~~~~~~
   include/net/sock.h:349:34: error: 'struct sock_common' has no member named 'skc_v6_daddr'; did you mean 'skc_daddr'?
    #define sk_v6_daddr  __sk_common.skc_v6_daddr
                                     ^
   include/net/ip6_route.h:222:14: note: in expansion of macro 'sk_v6_daddr'
            &sk->sk_v6_daddr : NULL,
                 ^~~~~~~~~~~

vim +/sk_v6_daddr +221 include/net/ip6_route.h

   219	
   220		ip6_dst_store(sk, dst,
 > 221			      ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
   222			      &sk->sk_v6_daddr : NULL,
   223	#ifdef CONFIG_IPV6_SUBTREES
   224			      ipv6_addr_equal(&fl6->saddr, &np->saddr) ?
   225			      &np->saddr :
   226	#endif
   227			      NULL);
   228	}
   229	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

On 03/30/2018 01:14 PM, kbuild test robot wrote:

Hi Alexey,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net/master]

url:    https://github.com/0day-ci/linux/commits/Alexey-Kodanev/ipv6-move-ip6_dst_store-calls-with-flowi6-checks-to-a-wrapper/20180330-173050
config: ia64-defconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=ia64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/tcp.h:23:0,
                    from include/linux/ipv6.h:87,
                    from include/net/ipv6.h:16,
                    from include/net/inetpeer.h:16,
                    from include/net/route.h:28,
                    from drivers/infiniband/core/addr.c:43:
   include/net/ip6_route.h: In function 'ip6_dst_store_flow':
   include/net/sock.h:349:34: error: 'struct sock_common' has no member named 'skc_v6_daddr'; did you mean 'skc_daddr'?
    #define sk_v6_daddr  __sk_common.skc_v6_daddr
                                     ^

quoted

quoted

include/net/ip6_route.h:221:43: note: in expansion of macro 'sk_v6_daddr'

            ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
                                              ^~~~~~~~~~~
   include/net/sock.h:349:34: error: 'struct sock_common' has no member named 'skc_v6_daddr'; did you mean 'skc_daddr'?
    #define sk_v6_daddr  __sk_common.skc_v6_daddr
                                     ^
   include/net/ip6_route.h:222:14: note: in expansion of macro 'sk_v6_daddr'
            &sk->sk_v6_daddr : NULL
                 ^~~~~~~~~~~

This is because CONFIG_IPV6 is not enabled, no sk_v6_daddr member,
I'll fix it in the new version.

Thanks,
Alexey

Hi Alexey,

I love your patch! Yet something to improve:

[auto build test ERROR on net/master]

url:    https://github.com/0day-ci/linux/commits/Alexey-Kodanev/ipv6-move-ip6_dst_store-calls-with-flowi6-checks-to-a-wrapper/20180330-173050
config: x86_64-kexec (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from include/linux/tcp.h:23:0,
                    from drivers/net/ethernet/chelsio/libcxgb/libcxgb_cm.c:33:
   include/net/ip6_route.h: In function 'ip6_dst_store_flow':

quoted

include/net/sock.h:349:34: error: 'struct sock_common' has no member named 'skc_v6_daddr'; did you mean 'skc_daddr'?

    #define sk_v6_daddr  __sk_common.skc_v6_daddr
                                     ^
   include/net/ip6_route.h:221:43: note: in expansion of macro 'sk_v6_daddr'
            ipv6_addr_equal(&fl6->daddr, &sk->sk_v6_daddr) ?
                                              ^~~~~~~~~~~

quoted

include/net/sock.h:349:34: error: 'struct sock_common' has no member named 'skc_v6_daddr'; did you mean 'skc_daddr'?

    #define sk_v6_daddr  __sk_common.skc_v6_daddr
                                     ^
   include/net/ip6_route.h:222:14: note: in expansion of macro 'sk_v6_daddr'
            &sk->sk_v6_daddr : NULL,
                 ^~~~~~~~~~~

vim +349 include/net/sock.h

4dc6dc716 Eric Dumazet             2009-07-15  329  
68835aba4 Eric Dumazet             2010-11-30  330  #define sk_dontcopy_begin	__sk_common.skc_dontcopy_begin
68835aba4 Eric Dumazet             2010-11-30  331  #define sk_dontcopy_end		__sk_common.skc_dontcopy_end
4dc6dc716 Eric Dumazet             2009-07-15  332  #define sk_hash			__sk_common.skc_hash
508054668 Eric Dumazet             2013-10-02  333  #define sk_portpair		__sk_common.skc_portpair
05dbc7b59 Eric Dumazet             2013-10-03  334  #define sk_num			__sk_common.skc_num
05dbc7b59 Eric Dumazet             2013-10-03  335  #define sk_dport		__sk_common.skc_dport
508054668 Eric Dumazet             2013-10-02  336  #define sk_addrpair		__sk_common.skc_addrpair
508054668 Eric Dumazet             2013-10-02  337  #define sk_daddr		__sk_common.skc_daddr
508054668 Eric Dumazet             2013-10-02  338  #define sk_rcv_saddr		__sk_common.skc_rcv_saddr
^1da177e4 Linus Torvalds           2005-04-16  339  #define sk_family		__sk_common.skc_family
^1da177e4 Linus Torvalds           2005-04-16  340  #define sk_state		__sk_common.skc_state
^1da177e4 Linus Torvalds           2005-04-16  341  #define sk_reuse		__sk_common.skc_reuse
055dc21a1 Tom Herbert              2013-01-22  342  #define sk_reuseport		__sk_common.skc_reuseport
9fe516ba3 Eric Dumazet             2014-06-27  343  #define sk_ipv6only		__sk_common.skc_ipv6only
26abe1437 Eric W. Biederman        2015-05-08  344  #define sk_net_refcnt		__sk_common.skc_net_refcnt
^1da177e4 Linus Torvalds           2005-04-16  345  #define sk_bound_dev_if		__sk_common.skc_bound_dev_if
^1da177e4 Linus Torvalds           2005-04-16  346  #define sk_bind_node		__sk_common.skc_bind_node
8feaf0c0a Arnaldo Carvalho de Melo 2005-08-09  347  #define sk_prot			__sk_common.skc_prot
07feaebfc Eric W. Biederman        2007-09-12  348  #define sk_net			__sk_common.skc_net
efe4208f4 Eric Dumazet             2013-10-03 @349  #define sk_v6_daddr		__sk_common.skc_v6_daddr
efe4208f4 Eric Dumazet             2013-10-03  350  #define sk_v6_rcv_saddr	__sk_common.skc_v6_rcv_saddr
33cf7c90f Eric Dumazet             2015-03-11  351  #define sk_cookie		__sk_common.skc_cookie
70da268b5 Eric Dumazet             2015-10-08  352  #define sk_incoming_cpu		__sk_common.skc_incoming_cpu
8e5eb54d3 Eric Dumazet             2015-10-08  353  #define sk_flags		__sk_common.skc_flags
ed53d0ab7 Eric Dumazet             2015-10-08  354  #define sk_rxhash		__sk_common.skc_rxhash
efe4208f4 Eric Dumazet             2013-10-03  355  
^1da177e4 Linus Torvalds           2005-04-16  356  	socket_lock_t		sk_lock;
9115e8cd2 Eric Dumazet             2016-12-03  357  	atomic_t		sk_drops;
9115e8cd2 Eric Dumazet             2016-12-03  358  	int			sk_rcvlowat;
9115e8cd2 Eric Dumazet             2016-12-03  359  	struct sk_buff_head	sk_error_queue;
b178bb3df Eric Dumazet             2010-11-16  360  	struct sk_buff_head	sk_receive_queue;
fa438ccfd Eric Dumazet             2007-03-04  361  	/*
fa438ccfd Eric Dumazet             2007-03-04  362  	 * The backlog queue is special, it is always used with
fa438ccfd Eric Dumazet             2007-03-04  363  	 * the per-socket spinlock held and requires low latency
fa438ccfd Eric Dumazet             2007-03-04  364  	 * access. Therefore we special case it's implementation.
b178bb3df Eric Dumazet             2010-11-16  365  	 * Note : rmem_alloc is in this structure to fill a hole
b178bb3df Eric Dumazet             2010-11-16  366  	 * on 64bit arches, not because its logically part of
b178bb3df Eric Dumazet             2010-11-16  367  	 * backlog.
fa438ccfd Eric Dumazet             2007-03-04  368  	 */
fa438ccfd Eric Dumazet             2007-03-04  369  	struct {
b178bb3df Eric Dumazet             2010-11-16  370  		atomic_t	rmem_alloc;
b178bb3df Eric Dumazet             2010-11-16  371  		int		len;
fa438ccfd Eric Dumazet             2007-03-04  372  		struct sk_buff	*head;
fa438ccfd Eric Dumazet             2007-03-04  373  		struct sk_buff	*tail;
fa438ccfd Eric Dumazet             2007-03-04  374  	} sk_backlog;
b178bb3df Eric Dumazet             2010-11-16  375  #define sk_rmem_alloc sk_backlog.rmem_alloc
2c8c56e15 Eric Dumazet             2014-11-11  376  
9115e8cd2 Eric Dumazet             2016-12-03  377  	int			sk_forward_alloc;
e0d1095ae Cong Wang                2013-08-01  378  #ifdef CONFIG_NET_RX_BUSY_POLL
dafcc4380 Eliezer Tamir            2013-06-14  379  	unsigned int		sk_ll_usec;
9115e8cd2 Eric Dumazet             2016-12-03  380  	/* ===== mostly read cache line ===== */
9115e8cd2 Eric Dumazet             2016-12-03  381  	unsigned int		sk_napi_id;
060212928 Eliezer Tamir            2013-06-10  382  #endif
b178bb3df Eric Dumazet             2010-11-16  383  	int			sk_rcvbuf;
b178bb3df Eric Dumazet             2010-11-16  384  
b178bb3df Eric Dumazet             2010-11-16  385  	struct sk_filter __rcu	*sk_filter;
ceb5d58b2 Eric Dumazet             2015-11-29  386  	union {
eaefd1105 Eric Dumazet             2011-02-18  387  		struct socket_wq __rcu	*sk_wq;
ceb5d58b2 Eric Dumazet             2015-11-29  388  		struct socket_wq	*sk_wq_raw;
ceb5d58b2 Eric Dumazet             2015-11-29  389  	};
def8b4faf Alexey Dobriyan          2008-10-28  390  #ifdef CONFIG_XFRM
d188ba86d Eric Dumazet             2015-12-08  391  	struct xfrm_policy __rcu *sk_policy[2];
def8b4faf Alexey Dobriyan          2008-10-28  392  #endif
deaa58542 Eric Dumazet             2012-06-24  393  	struct dst_entry	*sk_rx_dst;
0e36cbb34 Cong Wang                2013-01-22  394  	struct dst_entry __rcu	*sk_dst_cache;
^1da177e4 Linus Torvalds           2005-04-16  395  	atomic_t		sk_omem_alloc;
4e07a91c3 Arnaldo Carvalho de Melo 2007-05-29  396  	int			sk_sndbuf;
9115e8cd2 Eric Dumazet             2016-12-03  397  
9115e8cd2 Eric Dumazet             2016-12-03  398  	/* ===== cache line for TX ===== */
9115e8cd2 Eric Dumazet             2016-12-03  399  	int			sk_wmem_queued;
14afee4b6 Reshetova, Elena         2017-06-30  400  	refcount_t		sk_wmem_alloc;
9115e8cd2 Eric Dumazet             2016-12-03  401  	unsigned long		sk_tsq_flags;
75c119afe Eric Dumazet             2017-10-05  402  	union {
9115e8cd2 Eric Dumazet             2016-12-03  403  		struct sk_buff	*sk_send_head;
75c119afe Eric Dumazet             2017-10-05  404  		struct rb_root	tcp_rtx_queue;
75c119afe Eric Dumazet             2017-10-05  405  	};
^1da177e4 Linus Torvalds           2005-04-16  406  	struct sk_buff_head	sk_write_queue;
9115e8cd2 Eric Dumazet             2016-12-03  407  	__s32			sk_peek_off;
9115e8cd2 Eric Dumazet             2016-12-03  408  	int			sk_write_pending;
9b8805a32 Julian Anastasov         2017-02-06  409  	__u32			sk_dst_pending_confirm;
218af599f Eric Dumazet             2017-05-16  410  	u32			sk_pacing_status; /* see enum sk_pacing */
9115e8cd2 Eric Dumazet             2016-12-03  411  	long			sk_sndtimeo;
9115e8cd2 Eric Dumazet             2016-12-03  412  	struct timer_list	sk_timer;
9115e8cd2 Eric Dumazet             2016-12-03  413  	__u32			sk_priority;
9115e8cd2 Eric Dumazet             2016-12-03  414  	__u32			sk_mark;
9115e8cd2 Eric Dumazet             2016-12-03  415  	u32			sk_pacing_rate; /* bytes per second */
9115e8cd2 Eric Dumazet             2016-12-03  416  	u32			sk_max_pacing_rate;
9115e8cd2 Eric Dumazet             2016-12-03  417  	struct page_frag	sk_frag;
9115e8cd2 Eric Dumazet             2016-12-03  418  	netdev_features_t	sk_route_caps;
9115e8cd2 Eric Dumazet             2016-12-03  419  	netdev_features_t	sk_route_nocaps;
9115e8cd2 Eric Dumazet             2016-12-03  420  	int			sk_gso_type;
9115e8cd2 Eric Dumazet             2016-12-03  421  	unsigned int		sk_gso_max_size;
9115e8cd2 Eric Dumazet             2016-12-03  422  	gfp_t			sk_allocation;
9115e8cd2 Eric Dumazet             2016-12-03  423  	__u32			sk_txhash;
fc64869c4 Andrey Ryabinin          2016-05-18  424  
fc64869c4 Andrey Ryabinin          2016-05-18  425  	/*
fc64869c4 Andrey Ryabinin          2016-05-18  426  	 * Because of non atomicity rules, all
fc64869c4 Andrey Ryabinin          2016-05-18  427  	 * changes are protected by socket lock.
fc64869c4 Andrey Ryabinin          2016-05-18  428  	 */
aa4c1037a David Ahern              2016-12-01  429  	unsigned int		__sk_flags_offset[0];
aa4c1037a David Ahern              2016-12-01  430  #ifdef __BIG_ENDIAN_BITFIELD
aa4c1037a David Ahern              2016-12-01  431  #define SK_FL_PROTO_SHIFT  16
aa4c1037a David Ahern              2016-12-01  432  #define SK_FL_PROTO_MASK   0x00ff0000
aa4c1037a David Ahern              2016-12-01  433  

:::::: The code at line 349 was first introduced by commit
:::::: efe4208f47f907b86f528788da711e8ab9dea44d ipv6: make lookups simpler and faster

:::::: TO: Eric Dumazet [off-list ref]
:::::: CC: David S. Miller [off-list ref]

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0-DAY kernel test infrastructure                Open Source Technology Center
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