[SCTP] Extend the info exported via /proc/net/sctp to support netstat for SCTP.

Signed-off-by: Vladislav Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 151 insertions, 43 deletions

diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index e42fd8c2916b..98d49ec9b74b 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -132,14 +132,25 @@ void sctp_snmp_proc_exit(void)
 static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
 {
         struct list_head *pos;
+        struct sctp_association *asoc;
         struct sctp_sockaddr_entry *laddr;
-        union sctp_addr *addr;
+        struct sctp_transport *peer;
+        union sctp_addr *addr, *primary = NULL;
         struct sctp_af *af;
 
+        if (epb->type == SCTP_EP_TYPE_ASSOCIATION) {
+            asoc = sctp_assoc(epb);
+            peer = asoc->peer.primary_path;
+            primary = &peer->saddr;
+        }
+
         list_for_each(pos, &epb->bind_addr.address_list) {
                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
                 addr = (union sctp_addr *)&laddr->a;
                 af = sctp_get_af_specific(addr->sa.sa_family);
+                if (primary && af->cmp_addr(addr, primary)) {
+                        seq_printf(seq, "*");
+                }
                 af->seq_dump_addr(seq, addr);
         }
 }
@@ -149,17 +160,54 @@ static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_associa
 {
         struct list_head *pos;
         struct sctp_transport *transport;
-        union sctp_addr *addr;
+        union sctp_addr *addr, *primary;
         struct sctp_af *af;
 
+        primary = &(assoc->peer.primary_addr);
         list_for_each(pos, &assoc->peer.transport_addr_list) {
                 transport = list_entry(pos, struct sctp_transport, transports);
                 addr = (union sctp_addr *)&transport->ipaddr;
                 af = sctp_get_af_specific(addr->sa.sa_family);
+                if (af->cmp_addr(addr, primary)) {
+                        seq_printf(seq, "*");
+                }
                 af->seq_dump_addr(seq, addr);
         }
 }
 
+static void * sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        if (*pos > sctp_ep_hashsize)
+                return NULL;
+
+        if (*pos < 0)
+                *pos = 0;
+
+        if (*pos == 0)
+                seq_printf(seq, " ENDPT     SOCK   STY SST HBKT LPORT   UID INODE LADDRS\n");
+
+        ++*pos;
+
+        return (void *)pos;
+}
+
+static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
+{
+        return;
+}
+
+
+static void * sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        if (*pos > sctp_ep_hashsize)
+                return NULL;
+
+        ++*pos;
+
+        return pos;
+}
+
+
 /* Display sctp endpoints (/proc/net/sctp/eps). */
 static int sctp_eps_seq_show(struct seq_file *seq, void *v)
 {
@@ -167,38 +215,50 @@ static int sctp_eps_seq_show(struct seq_file *seq, void *v)
         struct sctp_ep_common *epb;
         struct sctp_endpoint *ep;
         struct sock *sk;
-        int hash;
-
-        seq_printf(seq, " ENDPT     SOCK   STY SST HBKT LPORT LADDRS\n");
-        for (hash = 0; hash < sctp_ep_hashsize; hash++) {
-                head = &sctp_ep_hashtable[hash];
-                read_lock(&head->lock);
-                for (epb = head->chain; epb; epb = epb->next) {
-                        ep = sctp_ep(epb);
-                        sk = epb->sk;
-                        seq_printf(seq, "%8p %8p %-3d %-3d %-4d %-5d ", ep, sk,
-                                   sctp_sk(sk)->type, sk->sk_state, hash,
-                                   epb->bind_addr.port);
-                        sctp_seq_dump_local_addrs(seq, epb);
-                        seq_printf(seq, "\n");
-                }
-                read_unlock(&head->lock);
+        int    hash = *(int *)v;
+
+        if (hash > sctp_ep_hashsize)
+                return -ENOMEM;
+
+        head = &sctp_ep_hashtable[hash-1];
+        sctp_local_bh_disable();
+        read_lock(&head->lock);
+        for (epb = head->chain; epb; epb = epb->next) {
+                ep = sctp_ep(epb);
+                sk = epb->sk;
+                seq_printf(seq, "%8p %8p %-3d %-3d %-4d %-5d %5d %5lu ", ep, sk,
+                           sctp_sk(sk)->type, sk->sk_state, hash-1,
+                           epb->bind_addr.port,
+                           sock_i_uid(sk), sock_i_ino(sk));
+
+                sctp_seq_dump_local_addrs(seq, epb);
+                seq_printf(seq, "\n");
         }
+        read_unlock(&head->lock);
+        sctp_local_bh_enable();
 
         return 0;
 }
 
+static struct seq_operations sctp_eps_ops = {
+        .start = sctp_eps_seq_start,
+        .next  = sctp_eps_seq_next,
+        .stop  = sctp_eps_seq_stop,
+        .show  = sctp_eps_seq_show,
+};
+
+
 /* Initialize the seq file operations for 'eps' object. */
 static int sctp_eps_seq_open(struct inode *inode, struct file *file)
 {
-        return single_open(file, sctp_eps_seq_show, NULL);
+        return seq_open(file, &sctp_eps_ops);
 }
 
 static struct file_operations sctp_eps_seq_fops = {
         .open    = sctp_eps_seq_open,
         .read    = seq_read,
         .llseek  = seq_lseek,
-        .release = single_release,
+        .release = seq_release,
 };
 
 /* Set up the proc fs entry for 'eps' object. */
@@ -221,6 +281,40 @@ void sctp_eps_proc_exit(void)
         remove_proc_entry("eps", proc_net_sctp);
 }
 
+
+static void * sctp_assocs_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        if (*pos > sctp_assoc_hashsize)
+                return NULL;
+
+        if (*pos < 0)
+                *pos = 0;
+
+        if (*pos == 0)
+                seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
+                                "RPORT LADDRS <-> RADDRS\n");
+
+        ++*pos;
+
+        return (void *)pos;
+}
+
+static void sctp_assocs_seq_stop(struct seq_file *seq, void *v)
+{
+        return;
+}
+
+
+static void * sctp_assocs_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        if (*pos > sctp_assoc_hashsize)
+                return NULL;
+
+        ++*pos;
+
+        return pos;
+}
+
 /* Display sctp associations (/proc/net/sctp/assocs). */
 static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
 {
@@ -228,43 +322,57 @@ static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
         struct sctp_ep_common *epb;
         struct sctp_association *assoc;
         struct sock *sk;
-        int hash;
-
-        seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT LPORT RPORT "
-                        "LADDRS <-> RADDRS\n");
-        for (hash = 0; hash < sctp_assoc_hashsize; hash++) {
-                head = &sctp_assoc_hashtable[hash];
-                read_lock(&head->lock);
-                for (epb = head->chain; epb; epb = epb->next) {
-                        assoc = sctp_assoc(epb);
-                        sk = epb->sk;
-                        seq_printf(seq,
-                                   "%8p %8p %-3d %-3d %-2d %-4d %-5d %-5d ",
-                                   assoc, sk, sctp_sk(sk)->type, sk->sk_state,
-                                   assoc->state, hash, epb->bind_addr.port,
-                                   assoc->peer.port);
-                        sctp_seq_dump_local_addrs(seq, epb);
-                        seq_printf(seq, "<-> ");
-                        sctp_seq_dump_remote_addrs(seq, assoc);
-                        seq_printf(seq, "\n");
-                }
-                read_unlock(&head->lock);
+        int    hash = *(int *)v;
+
+        if (hash > sctp_assoc_hashsize)
+                return -ENOMEM;
+
+        head = &sctp_assoc_hashtable[hash-1];
+        sctp_local_bh_disable();
+        read_lock(&head->lock);
+        for (epb = head->chain; epb; epb = epb->next) {
+                assoc = sctp_assoc(epb);
+                sk = epb->sk;
+                seq_printf(seq,
+                           "%8p %8p %-3d %-3d %-2d %-4d %4d %8d %8d %7d %5lu %-5d %5d ",
+                           assoc, sk, sctp_sk(sk)->type, sk->sk_state,
+                           assoc->state, hash-1, assoc->assoc_id,
+                           (sk->sk_rcvbuf - assoc->rwnd),
+                           assoc->sndbuf_used,
+                           sock_i_uid(sk), sock_i_ino(sk),
+                           epb->bind_addr.port,
+                           assoc->peer.port);
+
+                seq_printf(seq, " ");
+                sctp_seq_dump_local_addrs(seq, epb);
+                seq_printf(seq, "<-> ");
+                sctp_seq_dump_remote_addrs(seq, assoc);
+                seq_printf(seq, "\n");
         }
+        read_unlock(&head->lock);
+        sctp_local_bh_enable();
 
         return 0;
 }
 
+static struct seq_operations sctp_assoc_ops = {
+        .start = sctp_assocs_seq_start,
+        .next  = sctp_assocs_seq_next,
+        .stop  = sctp_assocs_seq_stop,
+        .show  = sctp_assocs_seq_show,
+};
+
 /* Initialize the seq file operations for 'assocs' object. */
 static int sctp_assocs_seq_open(struct inode *inode, struct file *file)
 {
-        return single_open(file, sctp_assocs_seq_show, NULL);
+        return seq_open(file, &sctp_assoc_ops);
 }
 
 static struct file_operations sctp_assocs_seq_fops = {
         .open    = sctp_assocs_seq_open,
         .read    = seq_read,
         .llseek  = seq_lseek,
-        .release = single_release,
+        .release = seq_release,
 };
 
 /* Set up the proc fs entry for 'assocs' object. */