o ipv4: convert /proc/net/route to seq_file

include/net/ip_fib.h

@@ -18,6 +18,7 @@
 
 #include <linux/config.h>
 #include <net/flow.h>
+#include <linux/seq_file.h>
 
 struct kern_rta
 {
@@ -128,8 +129,7 @@ struct fib_table
 	int		(*tb_dump)(struct fib_table *table, struct sk_buff *skb,
 				     struct netlink_callback *cb);
 	int		(*tb_flush)(struct fib_table *table);
-	int		(*tb_get_info)(struct fib_table *table, char *buf,
-				       int first, int count);
+	int		(*tb_seq_show)(struct fib_table *table, struct seq_file *seq);
 	void		(*tb_select_default)(struct fib_table *table,
 					     const struct flowi *flp, struct fib_result *res);
 
@@ -138,14 +138,14 @@ struct fib_table
 
 #ifndef CONFIG_IP_MULTIPLE_TABLES
 
-extern struct fib_table *local_table;
-extern struct fib_table *main_table;
+extern struct fib_table *ip_fib_local_table;
+extern struct fib_table *ip_fib_main_table;
 
 static inline struct fib_table *fib_get_table(int id)
 {
 	if (id != RT_TABLE_LOCAL)
-		return main_table;
-	return local_table;
+		return ip_fib_main_table;
+	return ip_fib_local_table;
 }
 
 static inline struct fib_table *fib_new_table(int id)
@@ -155,8 +155,8 @@ static inline struct fib_table *fib_new_table(int id)
 
 static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
 {
-	if (local_table->tb_lookup(local_table, flp, res) &&
-	    main_table->tb_lookup(main_table, flp, res))
+	if (ip_fib_local_table->tb_lookup(ip_fib_local_table, flp, res) &&
+	    ip_fib_main_table->tb_lookup(ip_fib_main_table, flp, res))
 		return -ENETUNREACH;
 	return 0;
 }
@@ -164,12 +164,12 @@ static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
 static inline void fib_select_default(const struct flowi *flp, struct fib_result *res)
 {
 	if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
-		main_table->tb_select_default(main_table, flp, res);
+		ip_fib_main_table->tb_select_default(ip_fib_main_table, flp, res);
 }
 
 #else /* CONFIG_IP_MULTIPLE_TABLES */
-#define local_table (fib_tables[RT_TABLE_LOCAL])
-#define main_table (fib_tables[RT_TABLE_MAIN])
+#define ip_fib_local_table (fib_tables[RT_TABLE_LOCAL])
+#define ip_fib_main_table (fib_tables[RT_TABLE_MAIN])
 
 extern struct fib_table * fib_tables[RT_TABLE_MAX+1];
 extern int fib_lookup(const struct flowi *flp, struct fib_result *res);
@@ -222,7 +222,8 @@ extern int fib_sync_down(u32 local, struct net_device *dev, int force);
 extern int fib_sync_up(struct net_device *dev);
 extern int fib_convert_rtentry(int cmd, struct nlmsghdr *nl, struct rtmsg *rtm,
 			       struct kern_rta *rta, struct rtentry *r);
-extern void fib_node_get_info(int type, int dead, struct fib_info *fi, u32 prefix, u32 mask, char *buffer);
+extern void fib_node_seq_show(struct seq_file *seq, int type, int dead,
+			      struct fib_info *fi, u32 prefix, u32 mask);
 extern u32  __fib_res_prefsrc(struct fib_result *res);
 
 /* Exported by fib_hash.c */

net/ipv4/fib_frontend.c

@@ -31,7 +31,6 @@
 #include <linux/inet.h>
 #include <linux/netdevice.h>
 #include <linux/if_arp.h>
-#include <linux/proc_fs.h>
 #include <linux/skbuff.h>
 #include <linux/netlink.h>
 #include <linux/init.h>
@@ -51,8 +50,8 @@
 
 #define RT_TABLE_MIN RT_TABLE_MAIN
 
-struct fib_table *local_table;
-struct fib_table *main_table;
+struct fib_table *ip_fib_local_table;
+struct fib_table *ip_fib_main_table;
 
 #else
 
@@ -88,56 +87,14 @@ void fib_flush(void)
 		flushed += tb->tb_flush(tb);
 	}
 #else /* CONFIG_IP_MULTIPLE_TABLES */
-	flushed += main_table->tb_flush(main_table);
-	flushed += local_table->tb_flush(local_table);
+	flushed += ip_fib_main_table->tb_flush(ip_fib_main_table);
+	flushed += ip_fib_local_table->tb_flush(ip_fib_local_table);
 #endif /* CONFIG_IP_MULTIPLE_TABLES */
 
 	if (flushed)
 		rt_cache_flush(-1);
 }
 
-
-#ifdef CONFIG_PROC_FS
-
-/* 
- *	Called from the PROCfs module. This outputs /proc/net/route.
- *
- *	It always works in backward compatibility mode.
- *	The format of the file is not supposed to be changed.
- */
- 
-static int
-fib_get_procinfo(char *buffer, char **start, off_t offset, int length)
-{
-	int first = offset/128;
-	char *ptr = buffer;
-	int count = (length+127)/128;
-	int len;
-
-	*start = buffer + offset%128;
-	
-	if (--first < 0) {
-		sprintf(buffer, "%-127s\n", "Iface\tDestination\tGateway \tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU\tWindow\tIRTT");
-		--count;
-		ptr += 128;
-		first = 0;
-  	}
-
-	if (main_table && count > 0) {
-		int n = main_table->tb_get_info(main_table, ptr, first, count);
-		count -= n;
-		ptr += n*128;
-	}
-	len = ptr - *start;
-	if (len >= length)
-		return length;
-	if (len >= 0)
-		return len;
-	return 0;
-}
-
-#endif /* CONFIG_PROC_FS */
-
 /*
  *	Find the first device with a given source address.
  */
@@ -152,9 +109,9 @@ struct net_device * ip_dev_find(u32 addr)
 	res.r = NULL;
 #endif
 
-	if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) {
+	if (!ip_fib_local_table ||
+	    ip_fib_local_table->tb_lookup(ip_fib_local_table, &fl, &res))
 		return NULL;
-	}
 	if (res.type != RTN_LOCAL)
 		goto out;
 	dev = FIB_RES_DEV(res);
@@ -181,9 +138,10 @@ unsigned inet_addr_type(u32 addr)
 	res.r = NULL;
 #endif
 	
-	if (local_table) {
+	if (ip_fib_local_table) {
 		ret = RTN_UNICAST;
-		if (local_table->tb_lookup(local_table, &fl, &res) == 0) {
+		if (!ip_fib_local_table->tb_lookup(ip_fib_local_table,
+						   &fl, &res)) {
 			ret = res.type;
 			fib_res_put(&res);
 		}
@@ -636,13 +594,9 @@ struct notifier_block fib_netdev_notifier = {
 
 void __init ip_fib_init(void)
 {
-#ifdef CONFIG_PROC_FS
-	proc_net_create("route",0,fib_get_procinfo);
-#endif		/* CONFIG_PROC_FS */
-
 #ifndef CONFIG_IP_MULTIPLE_TABLES
-	local_table = fib_hash_init(RT_TABLE_LOCAL);
-	main_table = fib_hash_init(RT_TABLE_MAIN);
+	ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL);
+	ip_fib_main_table  = fib_hash_init(RT_TABLE_MAIN);
 #else
 	fib_rules_init();
 #endif

net/ipv4/fib_hash.c

@@ -747,46 +747,31 @@ static int fn_hash_flush(struct fib_table *tb)
 
 #ifdef CONFIG_PROC_FS
 
-static int fn_hash_get_info(struct fib_table *tb, char *buffer, int first, int count)
+static int fn_hash_seq_show(struct fib_table *tb, struct seq_file *seq)
 {
-	struct fn_hash *table = (struct fn_hash*)tb->tb_data;
+	struct fn_hash *table = (struct fn_hash *)tb->tb_data;
 	struct fn_zone *fz;
-	int pos = 0;
-	int n = 0;
 
 	read_lock(&fib_hash_lock);
-	for (fz=table->fn_zone_list; fz; fz = fz->fz_next) {
+	for (fz = table->fn_zone_list; fz; fz = fz->fz_next) {
 		int i;
 		struct fib_node *f;
 		int maxslot = fz->fz_divisor;
 		struct fib_node **fp = fz->fz_hash;
 
-		if (fz->fz_nent == 0)
-			continue;
-
-		if (pos + fz->fz_nent <= first) {
-			pos += fz->fz_nent;
+		if (!fz->fz_nent)
 			continue;
-		}
 
-		for (i=0; i < maxslot; i++, fp++) {
-			for (f = *fp; f; f = f->fn_next) {
-				if (++pos <= first)
-					continue;
-				fib_node_get_info(f->fn_type,
-						  f->fn_state&FN_S_ZOMBIE,
+		for (i = 0; i < maxslot; i++, fp++)
+			for (f = *fp; f; f = f->fn_next)
+				fib_node_seq_show(seq, f->fn_type,
+						  f->fn_state & FN_S_ZOMBIE,
 						  FIB_INFO(f),
 						  fz_prefix(f->fn_key, fz),
-						  FZ_MASK(fz), buffer);
-				buffer += 128;
-				if (++n >= count)
-					goto out;
-			}
-		}
+						  FZ_MASK(fz));
 	}
-out:
 	read_unlock(&fib_hash_lock);
-  	return n;
+  	return 0;
 }
 #endif
 
@@ -913,7 +898,7 @@ struct fib_table * __init fib_hash_init(int id)
 	tb->tb_select_default = fn_hash_select_default;
 	tb->tb_dump = fn_hash_dump;
 #ifdef CONFIG_PROC_FS
-	tb->tb_get_info = fn_hash_get_info;
+	tb->tb_seq_show = fn_hash_seq_show;
 #endif
 	memset(tb->tb_data, 0, sizeof(struct fn_hash));
 	return tb;

net/ipv4/fib_semantics.c

@@ -1017,24 +1017,24 @@ static unsigned fib_flag_trans(int type, int dead, u32 mask, struct fib_info *fi
 	return flags;
 }
 
-void fib_node_get_info(int type, int dead, struct fib_info *fi, u32 prefix, u32 mask, char *buffer)
+void fib_node_seq_show(struct seq_file *seq, int type, int dead,
+		       struct fib_info *fi, u32 prefix, u32 mask)
 {
-	int len;
+	char bf[128];
 	unsigned flags = fib_flag_trans(type, dead, mask, fi);
 
-	if (fi) {
-		len = sprintf(buffer, "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+	if (fi)
+		snprintf(bf, sizeof(bf),
+			 "%s\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
 			 fi->fib_dev ? fi->fib_dev->name : "*", prefix,
 			 fi->fib_nh->nh_gw, flags, 0, 0, fi->fib_priority,
-			      mask, fi->fib_advmss+40, fi->fib_window, fi->fib_rtt>>3);
-	} else {
-		len = sprintf(buffer, "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
-			      prefix, 0,
-			      flags, 0, 0, 0,
-			      mask, 0, 0, 0);
-	}
-	memset(buffer+len, ' ', 127-len);
-	buffer[127] = '\n';
+			 mask, fi->fib_advmss + 40, fi->fib_window,
+			 fi->fib_rtt >> 3);
+	else
+		snprintf(bf, sizeof(bf),
+			 "*\t%08X\t%08X\t%04X\t%d\t%u\t%d\t%08X\t%d\t%u\t%u",
+			 prefix, 0, flags, 0, 0, 0, mask, 0, 0, 0);
+	seq_printf(seq, "%-127s\n", bf);
 }
 
 #endif

net/ipv4/ip_proc.c

@@ -18,6 +18,9 @@
 #include <linux/netdevice.h>
 #include <net/neighbour.h>
 #include <net/arp.h>
+#include <linux/rtnetlink.h>
+#include <linux/route.h>
+#include <net/ip_fib.h>
 #include <linux/seq_file.h>
 #include <linux/proc_fs.h>
 
@@ -30,6 +33,8 @@ extern int udp_get_info(char *, char **, off_t, int);
 
 #ifdef CONFIG_PROC_FS
 #ifdef CONFIG_AX25
+
+/* ------------------------------------------------------------------------ */
 /*
  *	ax25 -> ASCII conversion
  */
@@ -159,6 +164,40 @@ static int arp_seq_show(struct seq_file *seq, void *v)
 	return 0;
 }
 
+/* ------------------------------------------------------------------------ */
+
+static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	return *pos ? NULL : (void *)1;
+}
+
+static void *fib_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	return NULL;
+}
+
+static void fib_seq_stop(struct seq_file *seq, void *v)
+{
+}
+/* 
+ *	This outputs /proc/net/route.
+ *
+ *	It always works in backward compatibility mode.
+ *	The format of the file is not supposed to be changed.
+ */
+static int fib_seq_show(struct seq_file *seq, void *v)
+{
+	seq_printf(seq, "%-127s\n", "Iface\tDestination\tGateway "
+			"\tFlags\tRefCnt\tUse\tMetric\tMask\t\tMTU"
+			"\tWindow\tIRTT");
+	if (ip_fib_main_table)
+		ip_fib_main_table->tb_seq_show(ip_fib_main_table, seq);
+
+	return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+
 struct seq_operations arp_seq_ops = {
 	.start  = arp_seq_start,
 	.next   = arp_seq_next,
@@ -166,11 +205,23 @@ struct seq_operations arp_seq_ops = {
 	.show   = arp_seq_show,
 };
 
+struct seq_operations fib_seq_ops = {
+	.start  = fib_seq_start,
+	.next   = fib_seq_next,
+	.stop   = fib_seq_stop,
+	.show   = fib_seq_show,
+};
+
 static int arp_seq_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &arp_seq_ops);
 }
 
+static int fib_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &fib_seq_ops);
+}
+
 static struct file_operations arp_seq_fops = {
 	.open           = arp_seq_open,
 	.read           = seq_read,
@@ -178,6 +229,15 @@ static struct file_operations arp_seq_fops = {
 	.release	= seq_release,
 };
 
+static struct file_operations fib_seq_fops = {
+	.open           = fib_seq_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release	= seq_release,
+};
+
+/* ------------------------------------------------------------------------ */
+
 int __init ipv4_proc_init(void)
 {
 	struct proc_dir_entry *p;
@@ -205,8 +265,15 @@ int __init ipv4_proc_init(void)
 	if (!p)
 		goto out_arp;
 	p->proc_fops = &arp_seq_fops;
+
+	p = create_proc_entry("route", S_IRUGO, proc_net);
+	if (!p)
+		goto out_route;
+	p->proc_fops = &fib_seq_fops;
 out:
 	return rc;
+out_route:
+	remove_proc_entry("route", proc_net);
 out_arp:
 	proc_net_remove("udp");
 out_udp: