inet_diag: Generalize inet_diag dump and get_exact calls

Introduce two callbacks in inet_diag_handler -- one for dumping all
sockets (with filters) and the other one for dumping a single sk.

Replace direct calls to icsk handlers with indirect calls to callbacks
provided by handlers.

Make existing TCP and DCCP handlers use provided helpers for icsk-s.

The UDP diag module will provide its own.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 51 insertions, 8 deletions

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index eaf5865c9e8a..78972a149dff 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h
@@ -138,9 +138,18 @@ struct inet_hashinfo;
 struct nlattr;
 struct nlmsghdr;
 struct sk_buff;
+struct netlink_callback;
 
 struct inet_diag_handler {
-        struct inet_hashinfo    *idiag_hashinfo;
+        void                    (*dump)(struct sk_buff *skb,
+                                        struct netlink_callback *cb,
+                                        struct inet_diag_req *r,
+                                        struct nlattr *bc);
+
+        int                     (*dump_one)(struct sk_buff *in_skb,
+                                        const struct nlmsghdr *nlh,
+                                        struct inet_diag_req *req);
+
         void                    (*idiag_get_info)(struct sock *sk,
                                                   struct inet_diag_msg *r,
                                                   void *info);
@@ -152,6 +161,13 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
                               struct sk_buff *skb, struct inet_diag_req *req,
                               u32 pid, u32 seq, u16 nlmsg_flags,
                               const struct nlmsghdr *unlh);
+void inet_diag_dump_icsk(struct inet_hashinfo *h, struct sk_buff *skb,
+                struct netlink_callback *cb, struct inet_diag_req *r,
+                struct nlattr *bc);
+int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
+                struct sk_buff *in_skb, const struct nlmsghdr *nlh,
+                struct inet_diag_req *req);
+
 int inet_diag_bc_sk(const struct nlattr *_bc, struct sock *sk);
 int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req);
 
diff --git a/net/dccp/diag.c b/net/dccp/diag.c
index 9343f52db284..e29214d193d6 100644
--- a/net/dccp/diag.c
+++ b/net/dccp/diag.c
@@ -48,8 +48,21 @@ static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
                 dccp_get_info(sk, _info);
 }
 
+static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
+                struct inet_diag_req *r, struct nlattr *bc)
+{
+        inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r, bc);
+}
+
+static int dccp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
+                struct inet_diag_req *req)
+{
+        return inet_diag_dump_one_icsk(&dccp_hashinfo, in_skb, nlh, req);
+}
+
 static const struct inet_diag_handler dccp_diag_handler = {
-        .idiag_hashinfo  = &dccp_hashinfo,
+        .dump            = dccp_diag_dump,
+        .dump_one        = dccp_diag_dump_one,
         .idiag_get_info  = dccp_diag_get_info,
         .idiag_type      = IPPROTO_DCCP,
 };
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
index dc8611e3e66f..9b3e0b179cd2 100644
--- a/net/ipv4/inet_diag.c
+++ b/net/ipv4/inet_diag.c
@@ -273,7 +273,7 @@ int inet_diag_check_cookie(struct sock *sk, struct inet_diag_req *req)
 }
 EXPORT_SYMBOL_GPL(inet_diag_check_cookie);
 
-static int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
+int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
                 const struct nlmsghdr *nlh, struct inet_diag_req *req)
 {
         int err;
@@ -339,6 +339,7 @@ out:
 out_nosk:
         return err;
 }
+EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
 
 static int inet_diag_get_exact(struct sk_buff *in_skb,
                                const struct nlmsghdr *nlh,
@@ -351,8 +352,7 @@ static int inet_diag_get_exact(struct sk_buff *in_skb,
         if (IS_ERR(handler))
                 err = PTR_ERR(handler);
         else
-                err = inet_diag_dump_one_icsk(handler->idiag_hashinfo,
-                                in_skb, nlh, req);
+                err = handler->dump_one(in_skb, nlh, req);
         inet_diag_unlock_handler(handler);
 
         return err;
@@ -731,7 +731,7 @@ out:
         return err;
 }
 
-static void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
+void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
                 struct netlink_callback *cb, struct inet_diag_req *r, struct nlattr *bc)
 {
         int i, num;
@@ -880,6 +880,7 @@ done:
 out:
         ;
 }
+EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
 
 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
                 struct inet_diag_req *r, struct nlattr *bc)
@@ -888,7 +889,7 @@ static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 
         handler = inet_diag_lock_handler(r->sdiag_protocol);
         if (!IS_ERR(handler))
-                inet_diag_dump_icsk(handler->idiag_hashinfo, skb, cb, r, bc);
+                handler->dump(skb, cb, r, bc);
         inet_diag_unlock_handler(handler);
 
         return skb->len;
diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 42e6bec7bd3e..6334b1f71f2d 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -34,8 +34,21 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
                 tcp_get_info(sk, info);
 }
 
+static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
+                struct inet_diag_req *r, struct nlattr *bc)
+{
+        inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
+}
+
+static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
+                struct inet_diag_req *req)
+{
+        return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
+}
+
 static const struct inet_diag_handler tcp_diag_handler = {
-        .idiag_hashinfo  = &tcp_hashinfo,
+        .dump            = tcp_diag_dump,
+        .dump_one        = tcp_diag_dump_one,
         .idiag_get_info  = tcp_diag_get_info,
         .idiag_type      = IPPROTO_TCP,
 };