From: Sagi Grimberg <sagi@grimberg.me>
Date: Wed, 24 Jan 2018 20:24:24 +0200
Subject: [PATCH] net/utils: Introduce inet_addr_is_any
Git-commit: a470143fc83924251647143ff042bd2843e296cf
Patch-mainline: v4.17-rc1
References: bsc#1104967,FATE#325924
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
include/linux/inet.h | 1 +
net/core/utils.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/linux/inet.h b/include/linux/inet.h
index 636ebe87e6f8..97defc1139e9 100644
--- a/include/linux/inet.h
+++ b/include/linux/inet.h
@@ -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 */
diff --git a/net/core/utils.c b/net/core/utils.c
index 93066bd0305a..d47863b07a60 100644
--- a/net/core/utils.c
+++ b/net/core/utils.c
@@ -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)
{
--
2.16.4