[NETNS]: Add netns parameter to fib_get_table/fib_new_table.

This patch extends the fib_get_table and the fib_new_table functions
with the network namespace pointer. That will allow to access the
table relatively from the network namespace.

Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/ip_fib.h

@@ -165,7 +165,7 @@ struct fib_table {
 #define TABLE_LOCAL_INDEX	0
 #define TABLE_MAIN_INDEX	1
 
-static inline struct fib_table *fib_get_table(u32 id)
+static inline struct fib_table *fib_get_table(struct net *net, u32 id)
 {
 	struct hlist_head *ptr;
 
@@ -175,20 +175,20 @@ static inline struct fib_table *fib_get_table(u32 id)
 	return hlist_entry(ptr->first, struct fib_table, tb_hlist);
 }
 
-static inline struct fib_table *fib_new_table(u32 id)
+static inline struct fib_table *fib_new_table(struct net *net, u32 id)
 {
-	return fib_get_table(id);
+	return fib_get_table(net, id);
 }
 
 static inline int fib_lookup(const struct flowi *flp, struct fib_result *res)
 {
 	struct fib_table *table;
 
-	table = fib_get_table(RT_TABLE_LOCAL);
+	table = fib_get_table(&init_net, RT_TABLE_LOCAL);
 	if (!table->tb_lookup(table, flp, res))
 		return 0;
 
-	table = fib_get_table(RT_TABLE_MAIN);
+	table = fib_get_table(&init_net, RT_TABLE_MAIN);
 	if (!table->tb_lookup(table, flp, res))
 		return 0;
 	return -ENETUNREACH;
@@ -197,7 +197,7 @@ 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)
 {
-	struct fib_table *table = fib_get_table(RT_TABLE_MAIN);
+	struct fib_table *table = fib_get_table(&init_net, RT_TABLE_MAIN);
 	if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK)
 		table->tb_select_default(table, flp, res);
 }
@@ -212,8 +212,8 @@ extern u32 fib_rules_tclass(struct fib_result *res);
 
 extern int fib_lookup(struct flowi *flp, struct fib_result *res);
 
-extern struct fib_table *fib_new_table(u32 id);
-extern struct fib_table *fib_get_table(u32 id);
+extern struct fib_table *fib_new_table(struct net *net, u32 id);
+extern struct fib_table *fib_get_table(struct net *net, u32 id);
 extern void fib_select_default(const struct flowi *flp, struct fib_result *res);
 
 #endif /* CONFIG_IP_MULTIPLE_TABLES */

net/ipv4/fib_frontend.c

@@ -78,14 +78,14 @@ fail:
 }
 #else
 
-struct fib_table *fib_new_table(u32 id)
+struct fib_table *fib_new_table(struct net *net, u32 id)
 {
 	struct fib_table *tb;
 	unsigned int h;
 
 	if (id == 0)
 		id = RT_TABLE_MAIN;
-	tb = fib_get_table(id);
+	tb = fib_get_table(net, id);
 	if (tb)
 		return tb;
 	tb = fib_hash_init(id);
@@ -96,7 +96,7 @@ struct fib_table *fib_new_table(u32 id)
 	return tb;
 }
 
-struct fib_table *fib_get_table(u32 id)
+struct fib_table *fib_get_table(struct net *net, u32 id)
 {
 	struct fib_table *tb;
 	struct hlist_node *node;
@@ -148,7 +148,7 @@ struct net_device * ip_dev_find(__be32 addr)
 	res.r = NULL;
 #endif
 
-	local_table = fib_get_table(RT_TABLE_LOCAL);
+	local_table = fib_get_table(&init_net, RT_TABLE_LOCAL);
 	if (!local_table || local_table->tb_lookup(local_table, &fl, &res))
 		return NULL;
 	if (res.type != RTN_LOCAL)
@@ -183,7 +183,7 @@ static inline unsigned __inet_dev_addr_type(const struct net_device *dev,
 	res.r = NULL;
 #endif
 
-	local_table = fib_get_table(RT_TABLE_LOCAL);
+	local_table = fib_get_table(&init_net, RT_TABLE_LOCAL);
 	if (local_table) {
 		ret = RTN_UNICAST;
 		if (!local_table->tb_lookup(local_table, &fl, &res)) {
@@ -453,13 +453,13 @@ int ip_rt_ioctl(unsigned int cmd, void __user *arg)
 			struct fib_table *tb;
 
 			if (cmd == SIOCDELRT) {
-				tb = fib_get_table(cfg.fc_table);
+				tb = fib_get_table(&init_net, cfg.fc_table);
 				if (tb)
 					err = tb->tb_delete(tb, &cfg);
 				else
 					err = -ESRCH;
 			} else {
-				tb = fib_new_table(cfg.fc_table);
+				tb = fib_new_table(&init_net, cfg.fc_table);
 				if (tb)
 					err = tb->tb_insert(tb, &cfg);
 				else
@@ -573,7 +573,7 @@ static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *ar
 	if (err < 0)
 		goto errout;
 
-	tb = fib_get_table(cfg.fc_table);
+	tb = fib_get_table(net, cfg.fc_table);
 	if (tb == NULL) {
 		err = -ESRCH;
 		goto errout;
@@ -598,7 +598,7 @@ static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *ar
 	if (err < 0)
 		goto errout;
 
-	tb = fib_new_table(cfg.fc_table);
+	tb = fib_new_table(&init_net, cfg.fc_table);
 	if (tb == NULL) {
 		err = -ENOBUFS;
 		goto errout;
@@ -671,9 +671,9 @@ static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifad
 	};
 
 	if (type == RTN_UNICAST)
-		tb = fib_new_table(RT_TABLE_MAIN);
+		tb = fib_new_table(&init_net, RT_TABLE_MAIN);
 	else
-		tb = fib_new_table(RT_TABLE_LOCAL);
+		tb = fib_new_table(&init_net, RT_TABLE_LOCAL);
 
 	if (tb == NULL)
 		return;
@@ -848,7 +848,7 @@ static void nl_fib_input(struct sk_buff *skb)
 	nlh = nlmsg_hdr(skb);
 
 	frn = (struct fib_result_nl *) NLMSG_DATA(nlh);
-	tb = fib_get_table(frn->tb_id_in);
+	tb = fib_get_table(&init_net, frn->tb_id_in);
 
 	nl_fib_lookup(frn, tb);
 

net/ipv4/fib_hash.c

@@ -796,7 +796,7 @@ struct fib_iter_state {
 static struct fib_alias *fib_get_first(struct seq_file *seq)
 {
 	struct fib_iter_state *iter = seq->private;
-	struct fib_table *main_table = fib_get_table(RT_TABLE_MAIN);
+	struct fib_table *main_table = fib_get_table(&init_net, RT_TABLE_MAIN);
 	struct fn_hash *table = (struct fn_hash *)main_table->tb_data;
 
 	iter->bucket    = 0;
@@ -937,7 +937,7 @@ static void *fib_seq_start(struct seq_file *seq, loff_t *pos)
 	void *v = NULL;
 
 	read_lock(&fib_hash_lock);
-	if (fib_get_table(RT_TABLE_MAIN))
+	if (fib_get_table(&init_net, RT_TABLE_MAIN))
 		v = *pos ? fib_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 	return v;
 }

net/ipv4/fib_rules.c

@@ -93,7 +93,7 @@ static int fib4_rule_action(struct fib_rule *rule, struct flowi *flp,
 		goto errout;
 	}
 
-	if ((tbl = fib_get_table(rule->table)) == NULL)
+	if ((tbl = fib_get_table(&init_net, rule->table)) == NULL)
 		goto errout;
 
 	err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
@@ -109,7 +109,7 @@ void fib_select_default(const struct flowi *flp, struct fib_result *res)
 	if (res->r && res->r->action == FR_ACT_TO_TBL &&
 	    FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) {
 		struct fib_table *tb;
-		if ((tb = fib_get_table(res->r->table)) != NULL)
+		if ((tb = fib_get_table(&init_net, res->r->table)) != NULL)
 			tb->tb_select_default(tb, flp, res);
 	}
 }
@@ -130,13 +130,13 @@ static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
 	return 1;
 }
 
-static struct fib_table *fib_empty_table(void)
+static struct fib_table *fib_empty_table(struct net *net)
 {
 	u32 id;
 
 	for (id = 1; id <= RT_TABLE_MAX; id++)
-		if (fib_get_table(id) == NULL)
-			return fib_new_table(id);
+		if (fib_get_table(net, id) == NULL)
+			return fib_new_table(net, id);
 	return NULL;
 }
 
@@ -159,7 +159,7 @@ static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
 		if (rule->action == FR_ACT_TO_TBL) {
 			struct fib_table *table;
 
-			table = fib_empty_table();
+			table = fib_empty_table(&init_net);
 			if (table == NULL) {
 				err = -ENOBUFS;
 				goto errout;

net/ipv4/fib_trie.c

@@ -2167,12 +2167,12 @@ static int fib_triestat_seq_show(struct seq_file *seq, void *v)
 	struct fib_table *tb;
 
 	trie_local = NULL;
-	tb = fib_get_table(RT_TABLE_LOCAL);
+	tb = fib_get_table(&init_net, RT_TABLE_LOCAL);
 	if (tb)
 		trie_local = (struct trie *) tb->tb_data;
 
 	trie_main = NULL;
-	tb = fib_get_table(RT_TABLE_MAIN);
+	tb = fib_get_table(&init_net, RT_TABLE_MAIN);
 	if (tb)
 		trie_main = (struct trie *) tb->tb_data;
 
@@ -2239,12 +2239,12 @@ static void *fib_trie_seq_start(struct seq_file *seq, loff_t *pos)
 	struct fib_table *tb;
 
 	if (!iter->trie_local) {
-		tb = fib_get_table(RT_TABLE_LOCAL);
+		tb = fib_get_table(&init_net, RT_TABLE_LOCAL);
 		if (tb)
 			iter->trie_local = (struct trie *) tb->tb_data;
 	}
 	if (!iter->trie_main) {
-		tb = fib_get_table(RT_TABLE_MAIN);
+		tb = fib_get_table(&init_net, RT_TABLE_MAIN);
 		if (tb)
 			iter->trie_main = (struct trie *) tb->tb_data;
 	}