[INET]: Remove struct dst_entry *dst from request_sock_ops.rtx_syn_ack.

It looks like dst parameter is used in this API due to historical
reasons.  Actually, it is really used in the direct call to
tcp_v4_send_synack only.  So, create a wrapper for tcp_v4_send_synack
and remove dst from rtx_syn_ack.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index cff4608..040780a 100644 (file)
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -31,8 +31,7 @@ struct request_sock_ops {
        int             obj_size;
        struct kmem_cache       *slab;
        int             (*rtx_syn_ack)(struct sock *sk,
-                                      struct request_sock *req,
-                                      struct dst_entry *dst);
+                                      struct request_sock *req);
        void            (*send_ack)(struct sk_buff *skb,
                                    struct request_sock *req);
        void            (*send_reset)(struct sock *sk,

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 474075a..514a40b 100644 (file)
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -471,15 +471,14 @@ static struct dst_entry* dccp_v4_route_skb(struct sock *sk,
        return &rt->u.dst;
 }
 
-static int dccp_v4_send_response(struct sock *sk, struct request_sock *req,
-                                struct dst_entry *dst)
+static int dccp_v4_send_response(struct sock *sk, struct request_sock *req)
 {
        int err = -1;
        struct sk_buff *skb;
+       struct dst_entry *dst;
 
-       /* First, grab a route. */
-
-       if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL)
+       dst = inet_csk_route_req(sk, req);
+       if (dst == NULL)
                goto out;
 
        skb = dccp_make_response(sk, dst, req);
@@ -620,7 +619,7 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
        dreq->dreq_iss     = dccp_v4_init_sequence(skb);
        dreq->dreq_service = service;
 
-       if (dccp_v4_send_response(sk, req, NULL))
+       if (dccp_v4_send_response(sk, req))
                goto drop_and_free;
 
        inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 490333d..1a5e50b 100644 (file)
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -224,8 +224,7 @@ out:
 }
 
 
-static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
-                                struct dst_entry *dst)
+static int dccp_v6_send_response(struct sock *sk, struct request_sock *req)
 {
        struct inet6_request_sock *ireq6 = inet6_rsk(req);
        struct ipv6_pinfo *np = inet6_sk(sk);
@@ -234,6 +233,7 @@ static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
        struct in6_addr *final_p = NULL, final;
        struct flowi fl;
        int err = -1;
+       struct dst_entry *dst;
 
        memset(&fl, 0, sizeof(fl));
        fl.proto = IPPROTO_DCCP;
@@ -245,28 +245,26 @@ static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
        fl.fl_ip_sport = inet_sk(sk)->sport;
        security_req_classify_flow(req, &fl);
 
-       if (dst == NULL) {
-               opt = np->opt;
+       opt = np->opt;
 
-               if (opt != NULL && opt->srcrt != NULL) {
-                       const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
+       if (opt != NULL && opt->srcrt != NULL) {
+               const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
 
-                       ipv6_addr_copy(&final, &fl.fl6_dst);
-                       ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
-                       final_p = &final;
-               }
+               ipv6_addr_copy(&final, &fl.fl6_dst);
+               ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
+               final_p = &final;
+       }
 
-               err = ip6_dst_lookup(sk, &dst, &fl);
-               if (err)
-                       goto done;
+       err = ip6_dst_lookup(sk, &dst, &fl);
+       if (err)
+               goto done;
 
-               if (final_p)
-                       ipv6_addr_copy(&fl.fl6_dst, final_p);
+       if (final_p)
+               ipv6_addr_copy(&fl.fl6_dst, final_p);
 
-               err = xfrm_lookup(&dst, &fl, sk, 0);
-               if (err < 0)
-                       goto done;
-       }
+       err = xfrm_lookup(&dst, &fl, sk, 0);
+       if (err < 0)
+               goto done;
 
        skb = dccp_make_response(sk, dst, req);
        if (skb != NULL) {
@@ -448,7 +446,7 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
        dreq->dreq_iss     = dccp_v6_init_sequence(skb);
        dreq->dreq_service = service;
 
-       if (dccp_v6_send_response(sk, req, NULL))
+       if (dccp_v6_send_response(sk, req))
                goto drop_and_free;
 
        inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);

diff --git a/net/dccp/minisocks.c b/net/dccp/minisocks.c
index 027d181..33ad483 100644 (file)
--- a/net/dccp/minisocks.c
+++ b/net/dccp/minisocks.c
@@ -216,7 +216,7 @@ struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
                         * counter (backoff, monitored by dccp_response_timer).
                         */
                        req->retrans++;
-                       req->rsk_ops->rtx_syn_ack(sk, req, NULL);
+                       req->rsk_ops->rtx_syn_ack(sk, req);
                }
                /* Network Duplicate, discard packet */
                return NULL;

diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index b189278..c0e0fa0 100644 (file)
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -463,7 +463,7 @@ void inet_csk_reqsk_queue_prune(struct sock *parent,
                        if (time_after_eq(now, req->expires)) {
                                if ((req->retrans < thresh ||
                                     (inet_rsk(req)->acked && req->retrans < max_retries))
-                                   && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) {
+                                   && !req->rsk_ops->rtx_syn_ack(parent, req)) {
                                        unsigned long timeo;
 
                                        if (req->retrans++ == 0)

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 256032a..3b26f95 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -723,8 +723,8 @@ static void tcp_v4_reqsk_send_ack(struct sk_buff *skb,
  *     This still operates on a request_sock only, not on a big
  *     socket.
  */
-static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
-                             struct dst_entry *dst)
+static int __tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
+                               struct dst_entry *dst)
 {
        const struct inet_request_sock *ireq = inet_rsk(req);
        int err = -1;
@@ -732,7 +732,7 @@ static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
 
        /* First, grab a route. */
        if (!dst && (dst = inet_csk_route_req(sk, req)) == NULL)
-               goto out;
+               return -1;
 
        skb = tcp_make_synack(sk, dst, req);
 
@@ -751,11 +751,15 @@ static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req,
                err = net_xmit_eval(err);
        }
 
-out:
        dst_release(dst);
        return err;
 }
 
+static int tcp_v4_send_synack(struct sock *sk, struct request_sock *req)
+{
+       return __tcp_v4_send_synack(sk, req, NULL);
+}
+
 /*
  *     IPv4 request_sock destructor.
  */
@@ -1380,7 +1384,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
        }
        tcp_rsk(req)->snt_isn = isn;
 
-       if (tcp_v4_send_synack(sk, req, dst))
+       if (__tcp_v4_send_synack(sk, req, dst))
                goto drop_and_free;
 
        if (want_cookie) {

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index b61b768..0fdd1db 100644 (file)
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -536,7 +536,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
                 * Enforce "SYN-ACK" according to figure 8, figure 6
                 * of RFC793, fixed by RFC1122.
                 */
-               req->rsk_ops->rtx_syn_ack(sk, req, NULL);
+               req->rsk_ops->rtx_syn_ack(sk, req);
                return NULL;
        }
 

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 12750f2..1cbbb87 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -455,8 +455,7 @@ out:
 }
 
 
-static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
-                             struct dst_entry *dst)
+static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req)
 {
        struct inet6_request_sock *treq = inet6_rsk(req);
        struct ipv6_pinfo *np = inet6_sk(sk);
@@ -464,6 +463,7 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
        struct ipv6_txoptions *opt = NULL;
        struct in6_addr * final_p = NULL, final;
        struct flowi fl;
+       struct dst_entry *dst;
        int err = -1;
 
        memset(&fl, 0, sizeof(fl));
@@ -476,24 +476,22 @@ static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
        fl.fl_ip_sport = inet_sk(sk)->sport;
        security_req_classify_flow(req, &fl);
 
-       if (dst == NULL) {
-               opt = np->opt;
-               if (opt && opt->srcrt) {
-                       struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
-                       ipv6_addr_copy(&final, &fl.fl6_dst);
-                       ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
-                       final_p = &final;
-               }
-
-               err = ip6_dst_lookup(sk, &dst, &fl);
-               if (err)
-                       goto done;
-               if (final_p)
-                       ipv6_addr_copy(&fl.fl6_dst, final_p);
-               if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
-                       goto done;
+       opt = np->opt;
+       if (opt && opt->srcrt) {
+               struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt;
+               ipv6_addr_copy(&final, &fl.fl6_dst);
+               ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
+               final_p = &final;
        }
 
+       err = ip6_dst_lookup(sk, &dst, &fl);
+       if (err)
+               goto done;
+       if (final_p)
+               ipv6_addr_copy(&fl.fl6_dst, final_p);
+       if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
+               goto done;
+
        skb = tcp_make_synack(sk, dst, req);
        if (skb) {
                struct tcphdr *th = tcp_hdr(skb);
@@ -1294,7 +1292,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
 
        security_inet_conn_request(sk, skb, req);
 
-       if (tcp_v6_send_synack(sk, req, NULL))
+       if (tcp_v6_send_synack(sk, req))
                goto drop;
 
        inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);