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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: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2017-05-27 16:19:26 -06:00 committed by David S. Miller
parent ba277e8e05
commit 7805599895
3 changed files with 17 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/ip_fib.h
View File

@ -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);

7
net/ipv4/fib_frontend.c
View File

@ -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)

17
net/ipv4/fib_trie.c
View File

@ -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);