tcp: md5: get rid of tcp_v[46]_reqsk_md5_lookup()

With request socks convergence, we no longer need
different lookup methods. A request socket can
use generic lookup function.

Add const qualifier to 2nd tcp_v[46]_md5_lookup() parameter.

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

4 files changed, 12 insertions, 27 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 992be858c370..42690daa924e 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1303,7 +1303,7 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
 int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr,
                    int family);
 struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk,
-                                         struct sock *addr_sk);
+                                         const struct sock *addr_sk);
 
 #ifdef CONFIG_TCP_MD5SIG
 struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk,
@@ -1614,7 +1614,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
 struct tcp_sock_af_ops {
 #ifdef CONFIG_TCP_MD5SIG
         struct tcp_md5sig_key   *(*md5_lookup) (struct sock *sk,
-                                                struct sock *addr_sk);
+                                                const struct sock *addr_sk);
         int             (*calc_md5_hash)(char *location,
                                          const struct tcp_md5sig_key *md5,
                                          const struct sock *sk,
@@ -1628,8 +1628,8 @@ struct tcp_sock_af_ops {
 struct tcp_request_sock_ops {
         u16 mss_clamp;
 #ifdef CONFIG_TCP_MD5SIG
-        struct tcp_md5sig_key   *(*md5_lookup) (struct sock *sk,
-                                                struct request_sock *req);
+        struct tcp_md5sig_key *(*req_md5_lookup)(struct sock *sk,
+                                                 const struct sock *addr_sk);
         int             (*calc_md5_hash) (char *location,
                                           const struct tcp_md5sig_key *md5,
                                           const struct sock *sk,
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 79d5c641688c..fc8995a702a6 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -898,10 +898,10 @@ struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk,
                                          const union tcp_md5_addr *addr,
                                          int family)
 {
-        struct tcp_sock *tp = tcp_sk(sk);
+        const struct tcp_sock *tp = tcp_sk(sk);
         struct tcp_md5sig_key *key;
         unsigned int size = sizeof(struct in_addr);
-        struct tcp_md5sig_info *md5sig;
+        const struct tcp_md5sig_info *md5sig;
 
         /* caller either holds rcu_read_lock() or socket lock */
         md5sig = rcu_dereference_check(tp->md5sig_info,
@@ -924,24 +924,15 @@ struct tcp_md5sig_key *tcp_md5_do_lookup(struct sock *sk,
 EXPORT_SYMBOL(tcp_md5_do_lookup);
 
 struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk,
-                                         struct sock *addr_sk)
+                                         const struct sock *addr_sk)
 {
         union tcp_md5_addr *addr;
 
-        addr = (union tcp_md5_addr *)&inet_sk(addr_sk)->inet_daddr;
+        addr = (union tcp_md5_addr *)&sk->sk_daddr;
         return tcp_md5_do_lookup(sk, addr, AF_INET);
 }
 EXPORT_SYMBOL(tcp_v4_md5_lookup);
 
-static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk,
-                                                      struct request_sock *req)
-{
-        union tcp_md5_addr *addr;
-
-        addr = (union tcp_md5_addr *)&inet_rsk(req)->ir_rmt_addr;
-        return tcp_md5_do_lookup(sk, addr, AF_INET);
-}
-
 /* This can be called on a newly created socket, from other files */
 int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
                    int family, const u8 *newkey, u8 newkeylen, gfp_t gfp)
@@ -1247,7 +1238,7 @@ struct request_sock_ops tcp_request_sock_ops __read_mostly = {
 static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
         .mss_clamp      =       TCP_MSS_DEFAULT,
 #ifdef CONFIG_TCP_MD5SIG
-        .md5_lookup     =       tcp_v4_reqsk_md5_lookup,
+        .req_md5_lookup =       tcp_v4_md5_lookup,
         .calc_md5_hash  =       tcp_v4_md5_hash_skb,
 #endif
         .init_req       =       tcp_v4_init_req,
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 501cf9d401c3..2e69b8d16e68 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -2938,7 +2938,7 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
 
 #ifdef CONFIG_TCP_MD5SIG
         rcu_read_lock();
-        md5 = tcp_rsk(req)->af_specific->md5_lookup(sk, req);
+        md5 = tcp_rsk(req)->af_specific->req_md5_lookup(sk, req_to_sk(req));
 #endif
         tcp_header_size = tcp_synack_options(sk, req, mss, skb, &opts, md5,
                                              foc) + sizeof(*th);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 57d1c41404ec..a9568caf4675 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -486,17 +486,11 @@ static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk,
 }
 
 static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk,
-                                                struct sock *addr_sk)
+                                                const struct sock *addr_sk)
 {
         return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
 }
 
-static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk,
-                                                      struct request_sock *req)
-{
-        return tcp_v6_md5_do_lookup(sk, &inet_rsk(req)->ir_v6_rmt_addr);
-}
-
 static int tcp_v6_parse_md5_keys(struct sock *sk, char __user *optval,
                                  int optlen)
 {
@@ -720,7 +714,7 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
         .mss_clamp      =       IPV6_MIN_MTU - sizeof(struct tcphdr) -
                                 sizeof(struct ipv6hdr),
 #ifdef CONFIG_TCP_MD5SIG
-        .md5_lookup     =       tcp_v6_reqsk_md5_lookup,
+        .req_md5_lookup =       tcp_v6_md5_lookup,
         .calc_md5_hash  =       tcp_v6_md5_hash_skb,
 #endif
         .init_req       =       tcp_v6_init_req,