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Commit 78055998 authored by David Ahern's avatar David Ahern Committed by David S. Miller
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net: ipv4: Add extack message for invalid prefix or length 



Add extack error message for invalid prefix length and invalid prefix.
Example of the latter is a route spec containing 172.16.100.1/24, where
the /24 mask means the lower 8-bits should be 0. Amazing how easy that
one is to overlook when an EINVAL is returned.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ba277e8e

include/net/ip_fib.h

+2 −1
Original line number Diff line number Diff line
@@ -266,7 +266,8 @@ int fib_table_lookup(struct fib_table *tb, const struct flowi4 *flp, 
		     struct fib_result *res, int fib_flags);

int fib_table_insert(struct net *, struct fib_table *, struct fib_config *,

		     struct netlink_ext_ack *extack);

int fib_table_delete(struct net *, struct fib_table *, struct fib_config *);

int fib_table_delete(struct net *, struct fib_table *, struct fib_config *,

		     struct netlink_ext_ack *extack);

int fib_table_dump(struct fib_table *table, struct sk_buff *skb,

		   struct netlink_callback *cb);

int fib_table_flush(struct net *net, struct fib_table *table);

net/ipv4/fib_frontend.c

+4 −3
Original line number Diff line number Diff line
@@ -588,7 +588,8 @@ int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) 
			if (cmd == SIOCDELRT) {

				tb = fib_get_table(net, cfg.fc_table);

				if (tb)

					err = fib_table_delete(net, tb, &cfg);

					err = fib_table_delete(net, tb, &cfg,

							       NULL);

				else

					err = -ESRCH;

			} else {
@@ -732,7 +733,7 @@ static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, 
		goto errout;

	}



	err = fib_table_delete(net, tb, &cfg);

	err = fib_table_delete(net, tb, &cfg, extack);

errout:

	return err;

}
@@ -851,7 +852,7 @@ static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifad 
	if (cmd == RTM_NEWROUTE)

		fib_table_insert(net, tb, &cfg, NULL);

	else

		fib_table_delete(net, tb, &cfg);

		fib_table_delete(net, tb, &cfg, NULL);

}



void fib_add_ifaddr(struct in_ifaddr *ifa)

net/ipv4/fib_trie.c

+11 −6
Original line number Diff line number Diff line
@@ -1099,13 +1099,18 @@ static int fib_insert_alias(struct trie *t, struct key_vector *tp, 
	return 0;

}



static bool fib_valid_key_len(u32 key, u8 plen)

static bool fib_valid_key_len(u32 key, u8 plen, struct netlink_ext_ack *extack)

{

	if (plen > KEYLENGTH)

	if (plen > KEYLENGTH) {

		NL_SET_ERR_MSG(extack, "Invalid prefix length");

		return false;

	}



	if ((plen < KEYLENGTH) && (key << plen))

	if ((plen < KEYLENGTH) && (key << plen)) {

		NL_SET_ERR_MSG(extack,

			       "Invalid prefix for given prefix length");

		return false;

	}



	return true;

}
@@ -1128,7 +1133,7 @@ int fib_table_insert(struct net *net, struct fib_table *tb, 


	key = ntohl(cfg->fc_dst);



	if (!fib_valid_key_len(key, plen))

	if (!fib_valid_key_len(key, plen, extack))

		return -EINVAL;



	pr_debug("Insert table=%u %08x/%d\n", tb->tb_id, key, plen);
@@ -1516,7 +1521,7 @@ static void fib_remove_alias(struct trie *t, struct key_vector *tp, 


/* Caller must hold RTNL. */

int fib_table_delete(struct net *net, struct fib_table *tb,

		     struct fib_config *cfg)

		     struct fib_config *cfg, struct netlink_ext_ack *extack)

{

	struct trie *t = (struct trie *) tb->tb_data;

	struct fib_alias *fa, *fa_to_delete;
@@ -1528,7 +1533,7 @@ int fib_table_delete(struct net *net, struct fib_table *tb, 


	key = ntohl(cfg->fc_dst);



	if (!fib_valid_key_len(key, plen))

	if (!fib_valid_key_len(key, plen, extack))

		return -EINVAL;



	l = fib_find_node(t, &tp, key);