[SCTP] /proc interface to display associations/endpoints.

include/net/sctp/structs.h

@@ -265,6 +265,8 @@ struct sctp_af {
 	int             (*available)    (const union sctp_addr *);
 	int             (*skb_iif)      (const struct sk_buff *sk);
 	int             (*is_ce)        (const struct sk_buff *sk);
+	void		(*seq_dump_addr)(struct seq_file *seq,
+		       			 union sctp_addr *addr);
 	__u16		net_header_len;
 	int		sockaddr_len;
 	sa_family_t	sa_family;

net/sctp/ipv6.c

@@ -61,6 +61,7 @@
 #include <linux/ipv6.h>
 #include <linux/icmpv6.h>
 #include <linux/random.h>
+#include <linux/seq_file.h>
 
 #include <net/protocol.h>
 #include <net/tcp.h>
@@ -578,6 +579,13 @@ static int sctp_v6_is_ce(const struct sk_buff *skb)
 	return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
 }
 
+/* Dump the v6 addr to the seq file. */
+static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
+{
+	seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+		   NIP6(addr->v6.sin6_addr));
+}
+
 /* Initialize a PF_INET6 socket msg_name. */
 static void sctp_inet6_msgname(char *msgname, int *addr_len)
 {
@@ -840,6 +848,7 @@ static struct sctp_af sctp_ipv6_specific = {
 	.available       = sctp_v6_available,
 	.skb_iif         = sctp_v6_skb_iif,
 	.is_ce           = sctp_v6_is_ce,
+	.seq_dump_addr   = sctp_v6_seq_dump_addr,
 	.net_header_len  = sizeof(struct ipv6hdr),
 	.sockaddr_len    = sizeof(struct sockaddr_in6),
 	.sa_family       = AF_INET6,

net/sctp/proc.c

@@ -128,3 +128,162 @@ void sctp_snmp_proc_exit(void)
 {
 	remove_proc_entry("snmp", proc_net_sctp);
 }
+
+/* Dump local addresses of an association/endpoint. */
+static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
+{
+	struct list_head *pos;
+	struct sockaddr_storage_list *laddr;
+	union sctp_addr *addr;
+	struct sctp_af *af;
+
+	list_for_each(pos, &epb->bind_addr.address_list) {
+		laddr = list_entry(pos, struct sockaddr_storage_list, list);
+		addr = (union sctp_addr *)&laddr->a;
+		af = sctp_get_af_specific(addr->sa.sa_family);
+		af->seq_dump_addr(seq, addr);
+	}
+}
+
+/* Dump remote addresses of an association. */
+static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)
+{
+	struct list_head *pos;
+	struct sctp_transport *transport;
+	union sctp_addr *addr;
+	struct sctp_af *af;
+
+	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);
+		af->seq_dump_addr(seq, addr);
+	}
+}
+
+/* Display sctp endpoints (/proc/net/sctp/eps). */
+static int sctp_eps_seq_show(struct seq_file *seq, void *v)
+{
+	struct sctp_hashbucket *head;
+	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_hashbucket[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->state, hash,
+				   epb->bind_addr.port);
+			sctp_seq_dump_local_addrs(seq, epb);
+			seq_printf(seq, "\n");
+		}
+		read_unlock(&head->lock);
+	}
+
+	return 0;
+}
+
+/* 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);
+}
+
+static struct file_operations sctp_eps_seq_fops = {
+	.open	 = sctp_eps_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = single_release,
+};
+
+/* Set up the proc fs entry for 'eps' object. */
+int __init sctp_eps_proc_init(void)
+{
+	struct proc_dir_entry *p;
+
+	p = create_proc_entry("eps", S_IRUGO, proc_net_sctp);
+	if (!p)
+		return -ENOMEM;
+
+	p->proc_fops = &sctp_eps_seq_fops;
+
+	return 0;
+}
+
+/* Cleanup the proc fs entry for 'eps' object. */
+void sctp_eps_proc_exit(void)
+{
+	remove_proc_entry("eps", proc_net_sctp);
+}
+
+/* Display sctp associations (/proc/net/sctp/assocs). */
+static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
+{
+	struct sctp_hashbucket *head;
+	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_hashbucket[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->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);
+	}
+
+	return 0;
+}
+
+/* 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);
+}
+
+static struct file_operations sctp_assocs_seq_fops = {
+	.open	 = sctp_assocs_seq_open,
+	.read	 = seq_read,
+	.llseek	 = seq_lseek,
+	.release = single_release,
+};
+
+/* Set up the proc fs entry for 'assocs' object. */
+int __init sctp_assocs_proc_init(void)
+{
+	struct proc_dir_entry *p;
+
+	p = create_proc_entry("assocs", S_IRUGO, proc_net_sctp);
+	if (!p)
+		return -ENOMEM;
+
+	p->proc_fops = &sctp_assocs_seq_fops;
+
+	return 0;
+}
+
+/* Cleanup the proc fs entry for 'assocs' object. */
+void sctp_assocs_proc_exit(void)
+{
+	remove_proc_entry("assocs", proc_net_sctp);
+}

net/sctp/protocol.c

@@ -50,6 +50,7 @@
 #include <linux/init.h>
 #include <linux/netdevice.h>
 #include <linux/inetdevice.h>
+#include <linux/seq_file.h>
 #include <net/protocol.h>
 #include <net/ip.h>
 #include <net/ipv6.h>
@@ -81,6 +82,10 @@ extern struct net_proto_family inet_family_ops;
 
 extern int sctp_snmp_proc_init(void);
 extern int sctp_snmp_proc_exit(void);
+extern int sctp_eps_proc_init(void);
+extern int sctp_eps_proc_exit(void);
+extern int sctp_assocs_proc_init(void);
+extern int sctp_assocs_proc_exit(void);
 
 /* Return the address of the control sock. */
 struct sock *sctp_get_ctl_sock(void)
@@ -91,8 +96,6 @@ struct sock *sctp_get_ctl_sock(void)
 /* Set up the proc fs entry for the SCTP protocol. */
 __init int sctp_proc_init(void)
 {
-	int rc = 0;
-
 	if (!proc_net_sctp) {
 		struct proc_dir_entry *ent;
 		ent = proc_mkdir("net/sctp", 0);
@@ -100,13 +103,20 @@ __init int sctp_proc_init(void)
 			ent->owner = THIS_MODULE;
 			proc_net_sctp = ent;
 		} else
-			rc = -ENOMEM;
+			goto out_nomem;
 	}
 
 	if (sctp_snmp_proc_init())
-		rc = -ENOMEM;
+		goto out_nomem;	
+	if (sctp_eps_proc_init())
+		goto out_nomem;	
+	if (sctp_assocs_proc_init())
+		goto out_nomem;	
+
+	return 0;
 
-	return rc;
+out_nomem:
+	return -ENOMEM;
 }
 
 /* Clean up the proc fs entry for the SCTP protocol. 
@@ -116,6 +126,8 @@ __init int sctp_proc_init(void)
 void sctp_proc_exit(void)
 {
 	sctp_snmp_proc_exit();
+	sctp_eps_proc_exit();
+	sctp_assocs_proc_exit();
 
 	if (proc_net_sctp) {
 		proc_net_sctp = NULL;
@@ -568,6 +580,12 @@ struct sock *sctp_v4_create_accept_sk(struct sock *sk,
 	return newsk;
 }
 
+/* Dump the v4 addr to the seq file. */
+static void sctp_v4_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
+{
+	seq_printf(seq, "%d.%d.%d.%d ", NIPQUAD(addr->v4.sin_addr));
+}
+
 /* Event handler for inet address addition/deletion events.
  * Basically, whenever there is an event, we re-build our local address list.
  */
@@ -843,6 +861,7 @@ struct sctp_af sctp_ipv4_specific = {
 	.scope          = sctp_v4_scope,
 	.skb_iif        = sctp_v4_skb_iif,
 	.is_ce          = sctp_v4_is_ce,
+	.seq_dump_addr  = sctp_v4_seq_dump_addr,
 	.net_header_len = sizeof(struct iphdr),
 	.sockaddr_len   = sizeof(struct sockaddr_in),
 	.sa_family      = AF_INET,