inet: includes a sock_common in request_sock

TCP listener refactoring, part 5 :

We want to be able to insert request sockets (SYN_RECV) into main
ehash table instead of the per listener hash table to allow RCU
lookups and remove listener lock contention.

This patch includes the needed struct sock_common in front
of struct request_sock

This means there is no more inet6_request_sock IPv6 specific
structure.

Following inet_request_sock fields were renamed as they became
macros to reference fields from struct sock_common.
Prefix ir_ was chosen to avoid name collisions.

loc_port   -> ir_loc_port
loc_addr   -> ir_loc_addr
rmt_addr   -> ir_rmt_addr
rmt_port   -> ir_rmt_port
iif        -> ir_iif

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 7 deletions

diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 6d9a7e6eb5a4..f91204442efa 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -70,13 +70,14 @@ struct ip_options_data {
 
 struct inet_request_sock {
         struct request_sock     req;
-#if IS_ENABLED(CONFIG_IPV6)
-        u16                     inet6_rsk_offset;
-#endif
-        __be16                  loc_port;
-        __be32                  loc_addr;
-        __be32                  rmt_addr;
-        __be16                  rmt_port;
+#define ir_loc_addr             req.__req_common.skc_rcv_saddr
+#define ir_rmt_addr             req.__req_common.skc_daddr
+#define ir_loc_port             req.__req_common.skc_num
+#define ir_rmt_port             req.__req_common.skc_dport
+#define ir_v6_rmt_addr          req.__req_common.skc_v6_daddr
+#define ir_v6_loc_addr          req.__req_common.skc_v6_rcv_saddr
+#define ir_iif                  req.__req_common.skc_bound_dev_if
+
         kmemcheck_bitfield_begin(flags);
         u16                     snd_wscale : 4,
                                 rcv_wscale : 4,
@@ -88,6 +89,7 @@ struct inet_request_sock {
                                 no_srccheck: 1;
         kmemcheck_bitfield_end(flags);
         struct ip_options_rcu   *opt;
+        struct sk_buff          *pktopts;
 };
 
 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)