[IPV6]: Convert /proc/net/tcp6 to seq_file.

net/ipv6/af_inet6.c

@@ -77,7 +77,8 @@ MODULE_LICENSE("GPL");
 extern int raw6_proc_init(void);
 extern int raw6_proc_exit(void);
 
-extern int tcp6_get_info(char *, char **, off_t, int);
+extern int tcp6_proc_init(void);
+extern void tcp6_proc_exit(void);
 
 extern int udp6_proc_init(void);
 extern void udp6_proc_exit(void);
@@ -789,7 +790,7 @@ static int __init inet6_init(void)
 	err = -ENOMEM;
 	if (raw6_proc_init())
 		goto proc_raw6_fail;
-	if (!proc_net_create("tcp6", 0, tcp6_get_info))
+	if (tcp6_proc_init())
 		goto proc_tcp6_fail;
 	if (udp6_proc_init())
 		goto proc_udp6_fail;
@@ -824,7 +825,7 @@ static int __init inet6_init(void)
 proc_misc6_fail:
 	udp6_proc_exit();
 proc_udp6_fail:
-	proc_net_remove("tcp6");
+	tcp6_proc_exit();
 proc_tcp6_fail:
 	raw6_proc_exit();
 proc_raw6_fail:

net/ipv6/tcp_ipv6.c

@@ -17,6 +17,7 @@
  *	YOSHIFUJI Hideaki @USAGI and:	Support IPV6_V6ONLY socket option, which
  *	Alexey Kuznetsov		allow both IPv4 and IPv6 sockets to bind
  *					a single port at the same time.
+ *	YOSHIFUJI Hideaki @USAGI:	convert /proc/net/tcp6 to seq_file.
  *
  *	This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
@@ -55,6 +56,9 @@
 
 #include <asm/uaccess.h>
 
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
 static void	tcp_v6_send_reset(struct sk_buff *skb);
 static void	tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req);
 static void	tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len, 
@@ -1934,7 +1938,8 @@ static int tcp_v6_destroy_sock(struct sock *sk)
 }
 
 /* Proc filesystem TCPv6 sock list dumping. */
-static void get_openreq6(struct sock *sk, struct open_request *req, char *tmpbuf, int i, int uid)
+static void get_openreq6(struct seq_file *seq, 
+			 struct sock *sk, struct open_request *req, int i, int uid)
 {
 	struct in6_addr *dest, *src;
 	int ttd = req->expires - jiffies;
@@ -1944,9 +1949,9 @@ static void get_openreq6(struct sock *sk, struct open_request *req, char *tmpbuf
 
 	src = &req->af.v6_req.loc_addr;
 	dest = &req->af.v6_req.rmt_addr;
-	sprintf(tmpbuf,
+	seq_printf(seq,
 		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
-		"%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p",
+		   "%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p\n",
 		   i,
 		   src->s6_addr32[0], src->s6_addr32[1],
 		   src->s6_addr32[2], src->s6_addr32[3],
@@ -1965,7 +1970,7 @@ static void get_openreq6(struct sock *sk, struct open_request *req, char *tmpbuf
 		   0, req);
 }
 
-static void get_tcp6_sock(struct sock *sp, char *tmpbuf, int i)
+static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i)
 {
 	struct in6_addr *dest, *src;
 	__u16 destp, srcp;
@@ -1993,9 +1998,9 @@ static void get_tcp6_sock(struct sock *sp, char *tmpbuf, int i)
 		timer_expires = jiffies;
 	}
 
-	sprintf(tmpbuf,
+	seq_printf(seq,
 		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
-		"%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d",
+		   "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n",
 		   i,
 		   src->s6_addr32[0], src->s6_addr32[1],
 		   src->s6_addr32[2], src->s6_addr32[3], srcp,
@@ -2014,7 +2019,8 @@ static void get_tcp6_sock(struct sock *sp, char *tmpbuf, int i)
 		   );
 }
 
-static void get_timewait6_sock(struct tcp_tw_bucket *tw, char *tmpbuf, int i)
+static void get_timewait6_sock(struct seq_file *seq, 
+			       struct tcp_tw_bucket *tw, int i)
 {
 	struct in6_addr *dest, *src;
 	__u16 destp, srcp;
@@ -2028,9 +2034,9 @@ static void get_timewait6_sock(struct tcp_tw_bucket *tw, char *tmpbuf, int i)
 	destp = ntohs(tw->dport);
 	srcp  = ntohs(tw->sport);
 
-	sprintf(tmpbuf,
+	seq_printf(seq,
 		   "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
-		"%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p",
+		   "%02X %08X:%08X %02X:%08X %08X %5d %8d %d %d %p\n",
 		   i,
 		   src->s6_addr32[0], src->s6_addr32[1],
 		   src->s6_addr32[2], src->s6_addr32[3], srcp,
@@ -2041,131 +2047,54 @@ static void get_timewait6_sock(struct tcp_tw_bucket *tw, char *tmpbuf, int i)
 		   atomic_read(&tw->refcnt), tw);
 }
 
-#define LINE_LEN 190
-#define LINE_FMT "%-190s\n"
-
-int tcp6_get_info(char *buffer, char **start, off_t offset, int length)
+static int tcp6_seq_show(struct seq_file *seq, void *v)
 {
-	int len = 0, num = 0, i;
-	off_t begin, pos = 0;
-	char tmpbuf[LINE_LEN+2];
-
-	if (offset < LINE_LEN+1)
-		len += sprintf(buffer, LINE_FMT,
-			       "  sl  "						/* 6 */
-			       "local_address                         "		/* 38 */
-			       "remote_address                        "		/* 38 */
-			       "st tx_queue rx_queue tr tm->when retrnsmt"	/* 41 */
-			       "   uid  timeout inode");			/* 21 */
-										/*----*/
-										/*144 */
-
-	pos = LINE_LEN+1;
-
-	/* First, walk listening socket table. */
-	tcp_listen_lock();
-	for(i = 0; i < TCP_LHTABLE_SIZE; i++) {
-		struct sock *sk = tcp_listening_hash[i];
-		struct tcp_listen_opt *lopt;
-		int k;
-
-		for (sk = tcp_listening_hash[i]; sk; sk = sk->next, num++) {
-			struct open_request *req;
-			int uid;
-			struct tcp_opt *tp = tcp_sk(sk);
-
-			if (sk->family != PF_INET6)
-				continue;
-			pos += LINE_LEN+1;
-			if (pos >= offset) {
-				get_tcp6_sock(sk, tmpbuf, num);
-				len += sprintf(buffer+len, LINE_FMT, tmpbuf);
-				if (pos >= offset + length) {
-					tcp_listen_unlock();
-					goto out_no_bh;
-				}
-			}
-
-			uid = sock_i_uid(sk);
-			read_lock_bh(&tp->syn_wait_lock);
-			lopt = tp->listen_opt;
-			if (lopt && lopt->qlen != 0) {
-				for (k=0; k<TCP_SYNQ_HSIZE; k++) {
-					for (req = lopt->syn_table[k]; req; req = req->dl_next, num++) {
-						if (req->class->family != PF_INET6)
-							continue;
-						pos += LINE_LEN+1;
-						if (pos <= offset)
-							continue;
-						get_openreq6(sk, req, tmpbuf, num, uid);
-						len += sprintf(buffer+len, LINE_FMT, tmpbuf);
-						if (pos >= offset + length) { 
-							read_unlock_bh(&tp->syn_wait_lock);
-							tcp_listen_unlock();
-							goto out_no_bh;
-						}
-					}
-				}
+	struct tcp_iter_state *st;
+
+	if (v == (void *)1) {
+		seq_printf(seq,
+			   "  sl  "
+			   "local_address                         "
+			   "remote_address                        "
+			   "st tx_queue rx_queue tr tm->when retrnsmt"
+			   "   uid  timeout inode\n");
+		goto out;
 	}
-			read_unlock_bh(&tp->syn_wait_lock);
+	st = seq->private;
 
-			/* Completed requests are in normal socket hash table */
-		}
+	switch (st->state) {
+	case TCP_SEQ_STATE_LISTENING:
+	case TCP_SEQ_STATE_ESTABLISHED:
+		get_tcp6_sock(seq, v, st->num);
+		break;
+	case TCP_SEQ_STATE_OPENREQ:
+		get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid);
+		break;
+	case TCP_SEQ_STATE_TIME_WAIT:
+		get_timewait6_sock(seq, v, st->num);
+		break;
 	}
-	tcp_listen_unlock();
-
-	local_bh_disable();
+out:
+	return 0;
+}
 
-	/* Next, walk established hash chain. */
-	for (i = 0; i < tcp_ehash_size; i++) {
-		struct tcp_ehash_bucket *head = &tcp_ehash[i];
-		struct sock *sk;
-		struct tcp_tw_bucket *tw;
+static struct file_operations tcp6_seq_fops;
+static struct tcp_seq_afinfo tcp6_seq_afinfo = {
+	.owner		= THIS_MODULE,
+	.name		= "tcp6",
+	.family		= AF_INET6,
+	.seq_show	= tcp6_seq_show,
+	.seq_fops	= &tcp6_seq_fops,
+};
 
-		read_lock(&head->lock);
-		for(sk = head->chain; sk; sk = sk->next, num++) {
-			if (sk->family != PF_INET6)
-				continue;
-			pos += LINE_LEN+1;
-			if (pos <= offset)
-				continue;
-			get_tcp6_sock(sk, tmpbuf, num);
-			len += sprintf(buffer+len, LINE_FMT, tmpbuf);
-			if (pos >= offset + length) {
-				read_unlock(&head->lock);
-				goto out;
-			}
-		}
-		for (tw = (struct tcp_tw_bucket *)tcp_ehash[i+tcp_ehash_size].chain;
-		     tw != NULL;
-		     tw = (struct tcp_tw_bucket *)tw->next, num++) {
-			if (tw->family != PF_INET6)
-				continue;
-			pos += LINE_LEN+1;
-			if (pos <= offset)
-				continue;
-			get_timewait6_sock(tw, tmpbuf, num);
-			len += sprintf(buffer+len, LINE_FMT, tmpbuf);
-			if (pos >= offset + length) {
-				read_unlock(&head->lock);
-				goto out;
-			}
-		}
-		read_unlock(&head->lock);
-	}
+int __init tcp6_proc_init(void)
+{
+	return tcp_proc_register(&tcp6_seq_afinfo);
+}
 
-out:
-	local_bh_enable();
-out_no_bh:
-
-	begin = len - (pos - offset);
-	*start = buffer + begin;
-	len -= begin;
-	if (len > length)
-		len = length;
-	if (len < 0)
-		len = 0; 
-	return len;
+void tcp6_proc_exit(void)
+{
+	tcp_proc_unregister(&tcp6_seq_afinfo);
 }
 
 struct proto tcpv6_prot = {