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net/utils: Introduce inet_addr_is_any 

Can be useful to check INET_ANY address for both ipv4/ipv6 addresses.

Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Sagi Grimberg 2018-01-24 20:24:24 +02:00 committed by Jens Axboe
parent 57678e5a3d
commit a470143fc8
2 changed files with 24 additions and 0 deletions
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1
include/linux/inet.h
View File

@ -59,5 +59,6 @@ extern int in6_pton(const char *src, int srclen, u8 *dst, int delim, const char
extern int inet_pton_with_scope(struct net *net, unsigned short af,
const char *src, const char *port, struct sockaddr_storage *addr);
extern bool inet_addr_is_any(struct sockaddr *addr);
#endif /* _LINUX_INET_H */

23
net/core/utils.c
View File

@ -403,6 +403,29 @@ int inet_pton_with_scope(struct net *net, __kernel_sa_family_t af,
}
EXPORT_SYMBOL(inet_pton_with_scope);
bool inet_addr_is_any(struct sockaddr *addr)
{
if (addr->sa_family == AF_INET6) {
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr;
const struct sockaddr_in6 in6_any =
{ .sin6_addr = IN6ADDR_ANY_INIT };
if (!memcmp(in6->sin6_addr.s6_addr,
in6_any.sin6_addr.s6_addr, 16))
return true;
} else if (addr->sa_family == AF_INET) {
struct sockaddr_in *in = (struct sockaddr_in *)addr;
if (in->sin_addr.s_addr == htonl(INADDR_ANY))
return true;
} else {
pr_warn("unexpected address family %u\n", addr->sa_family);
}
return false;
}
EXPORT_SYMBOL(inet_addr_is_any);
void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,
__be32 from, __be32 to, bool pseudohdr)
{