[IPV6]: Introduce inet6_timewait_sock

Out of tcp6_timewait_sock, that now is just an aggregation of
inet_timewait_sock and inet6_timewait_sock, using tw_ipv6_offset in struct
inet_timewait_sock, that is common to the IPv6 transport protocols that use
timewait sockets, like DCCP and TCP.

tw_ipv6_offset plays the struct inet_sock pinfo6 role, i.e. for the generic
code to find the IPv6 area in a timewait sock.

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 69a0dec..7d39085 100644 (file)
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -348,26 +348,36 @@ static inline void inet_sk_copy_descendant(struct sock *sk_to,
 
 #include <linux/tcp.h>
 
+struct inet6_timewait_sock {
+       struct in6_addr tw_v6_daddr;
+       struct in6_addr tw_v6_rcv_saddr;
+};
+
 struct tcp6_timewait_sock {
-       struct tcp_timewait_sock tw_v6_sk;
-       struct in6_addr          tw_v6_daddr;
-       struct in6_addr          tw_v6_rcv_saddr;
+       struct tcp_timewait_sock   tcp6tw_tcp;
+       struct inet6_timewait_sock tcp6tw_inet6;
 };
 
-static inline struct tcp6_timewait_sock *tcp6_twsk(const struct sock *sk)
+static inline u16 inet6_tw_offset(const struct proto *prot)
+{
+       return prot->twsk_obj_size - sizeof(struct inet6_timewait_sock);
+}
+
+static inline struct inet6_timewait_sock *inet6_twsk(const struct sock *sk)
 {
-       return (struct tcp6_timewait_sock *)sk;
+       return (struct inet6_timewait_sock *)(((u8 *)sk) +
+                                             inet_twsk(sk)->tw_ipv6_offset);
 }
 
-static inline struct in6_addr *__tcp_v6_rcv_saddr(const struct sock *sk)
+static inline struct in6_addr *__inet6_rcv_saddr(const struct sock *sk)
 {
        return likely(sk->sk_state != TCP_TIME_WAIT) ?
-               &inet6_sk(sk)->rcv_saddr : &tcp6_twsk(sk)->tw_v6_rcv_saddr;
+               &inet6_sk(sk)->rcv_saddr : &inet6_twsk(sk)->tw_v6_rcv_saddr;
 }
 
-static inline struct in6_addr *tcp_v6_rcv_saddr(const struct sock *sk)
+static inline struct in6_addr *inet6_rcv_saddr(const struct sock *sk)
 {
-       return sk->sk_family == AF_INET6 ? __tcp_v6_rcv_saddr(sk) : NULL;
+       return sk->sk_family == AF_INET6 ? __inet6_rcv_saddr(sk) : NULL;
 }
 
 static inline int inet_v6_ipv6only(const struct sock *sk)
@@ -395,8 +405,8 @@ static inline struct raw6_sock *raw6_sk(const struct sock *sk)
        return NULL;
 }
 
-#define __tcp_v6_rcv_saddr(__sk)       NULL
-#define tcp_v6_rcv_saddr(__sk)         NULL
+#define __inet6_rcv_saddr(__sk)        NULL
+#define inet6_rcv_saddr(__sk)  NULL
 #define tcp_twsk_ipv6only(__sk)                0
 #define inet_v6_ipv6only(__sk)         0
 #endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */

diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index a4a204f..25f708f 100644 (file)
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -110,10 +110,10 @@ static inline struct sock *
 
                if(*((__u32 *)&(tw->tw_dport))  == ports        &&
                   sk->sk_family                == PF_INET6) {
-                       const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
+                       const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
 
-                       if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr)        &&
-                           ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr)    &&
+                       if (ipv6_addr_equal(&tw6->tw_v6_daddr, saddr)   &&
+                           ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr)       &&
                            (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
                                goto hit;
                }

diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
index 28f7b21..ca240f8 100644 (file)
--- a/include/net/inet_timewait_sock.h
+++ b/include/net/inet_timewait_sock.h
@@ -127,7 +127,8 @@ struct inet_timewait_sock {
        __u16                   tw_num;
        /* And these are ours. */
        __u8                    tw_ipv6only:1;
-       /* 31 bits hole, try to pack */
+       /* 15 bits hole, try to pack */
+       __u16                   tw_ipv6_offset;
        int                     tw_timeout;
        unsigned long           tw_ttd;
        struct inet_bind_bucket *tw_tb;

diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index 3ce73b1..c499081 100644 (file)
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -112,12 +112,12 @@ static int inet_diag_fill(struct sk_buff *skb, struct sock *sk,
                r->idiag_inode = 0;
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
                if (r->idiag_family == AF_INET6) {
-                       const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
+                       const struct inet6_timewait_sock *tw6 = inet6_twsk(sk);
 
                        ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
-                                      &tcp6tw->tw_v6_rcv_saddr);
+                                      &tw6->tw_v6_rcv_saddr);
                        ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
-                                      &tcp6tw->tw_v6_daddr);
+                                      &tw6->tw_v6_daddr);
                }
 #endif
                nlh->nlmsg_len = skb->tail - b;

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index 9c02968..2b9b7f6 100644 (file)
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -298,10 +298,12 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
                if (tw->tw_family == PF_INET6) {
                        struct ipv6_pinfo *np = inet6_sk(sk);
-                       struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw);
+                       struct inet6_timewait_sock *tw6;
 
-                       ipv6_addr_copy(&tcp6tw->tw_v6_daddr, &np->daddr);
-                       ipv6_addr_copy(&tcp6tw->tw_v6_rcv_saddr, &np->rcv_saddr);
+                       tw->tw_ipv6_offset = inet6_tw_offset(sk->sk_prot);
+                       tw6 = inet6_twsk((struct sock *)tw);
+                       ipv6_addr_copy(&tw6->tw_v6_daddr, &np->daddr);
+                       ipv6_addr_copy(&tw6->tw_v6_rcv_saddr, &np->rcv_saddr);
                        tw->tw_ipv6only = np->ipv6only;
                }
 #endif

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a60585f..704fb73 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1195,7 +1195,7 @@ struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *
 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
 {
        const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
-       const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
+       const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
        u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
        u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
        int sk_ipv6only = ipv6_only_sock(sk);

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2f932ce..cb88007 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -138,14 +138,14 @@ static int __tcp_v6_check_established(struct sock *sk, const __u16 lport,
 
        /* Check TIME-WAIT sockets first. */
        sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) {
-               const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk2);
+               const struct inet6_timewait_sock *tw6 = inet6_twsk(sk2);
 
                tw = inet_twsk(sk2);
 
                if(*((__u32 *)&(tw->tw_dport))  == ports        &&
                   sk2->sk_family               == PF_INET6     &&
-                  ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) &&
-                  ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr)     &&
+                  ipv6_addr_equal(&tw6->tw_v6_daddr, saddr)    &&
+                  ipv6_addr_equal(&tw6->tw_v6_rcv_saddr, daddr)        &&
                   sk2->sk_bound_dev_if == sk->sk_bound_dev_if) {
                        const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2);
                        struct tcp_sock *tp = tcp_sk(sk);
@@ -1663,14 +1663,14 @@ static void get_timewait6_sock(struct seq_file *seq,
 {
        struct in6_addr *dest, *src;
        __u16 destp, srcp;
-       struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw);
+       struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw);
        int ttd = tw->tw_ttd - jiffies;
 
        if (ttd < 0)
                ttd = 0;
 
-       dest = &tcp6tw->tw_v6_daddr;
-       src  = &tcp6tw->tw_v6_rcv_saddr;
+       dest = &tw6->tw_v6_daddr;
+       src  = &tw6->tw_v6_rcv_saddr;
        destp = ntohs(tw->tw_dport);
        srcp  = ntohs(tw->tw_sport);