netdev - [PATCH iproute2 2/3] ip/tunnel: Use get_addr() instead of get

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Date:   Wed, 13 Dec 2017 21:36:01 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     netdev@...r.kernel.org
Subject: [PATCH iproute2 2/3] ip/tunnel: Use get_addr() instead of get_prefix() for local/remote endpoints

Manual page ip-link(8) states that both local and remote accept
IPADDR not PREFIX. Use get_addr() instead of get_prefix() to
parse local/remote endpoint address correctly.

Force corresponding address family instead of using preferred_family
to catch weired cases as shown below.

Before this patch it is possible to create tunnel with commands:

  ip    li add dev ip6gre2 type ip6gre local fe80::1/64 remote fe80::2/64
  ip -4 li add dev ip6gre2 type ip6gre local 10.0.0.1/24 remote 10.0.0.2/24

Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
---
 ip/ip6tunnel.c   |    8 ++------
 ip/link_gre6.c   |    8 ++------
 ip/link_ip6tnl.c |   12 ++++--------
 ip/link_vti6.c   |    8 ++++----
 4 files changed, 12 insertions(+), 24 deletions(-)

diff --git a/ip/ip6tunnel.c b/ip/ip6tunnel.c
index 4563e1e..b8db49c 100644
--- a/ip/ip6tunnel.c
+++ b/ip/ip6tunnel.c
@@ -170,17 +170,13 @@ static int parse_args(int argc, char **argv, int cmd, struct ip6_tnl_parm2 *p)
 			inet_prefix raddr;
 
 			NEXT_ARG();
-			get_prefix(&raddr, *argv, preferred_family);
-			if (raddr.family == AF_UNSPEC)
-				invarg("\"remote\" address family is AF_UNSPEC", *argv);
+			get_addr(&raddr, *argv, AF_INET6);
 			memcpy(&p->raddr, &raddr.data, sizeof(p->raddr));
 		} else if (strcmp(*argv, "local") == 0) {
 			inet_prefix laddr;
 
 			NEXT_ARG();
-			get_prefix(&laddr, *argv, preferred_family);
-			if (laddr.family == AF_UNSPEC)
-				invarg("\"local\" address family is AF_UNSPEC", *argv);
+			get_addr(&laddr, *argv, AF_INET6);
 			memcpy(&p->laddr, &laddr.data, sizeof(p->laddr));
 		} else if (strcmp(*argv, "dev") == 0) {
 			NEXT_ARG();
diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index 0a82eae..c22fded 100644
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -257,17 +257,13 @@ get_failed:
 			inet_prefix addr;
 
 			NEXT_ARG();
-			get_prefix(&addr, *argv, preferred_family);
-			if (addr.family == AF_UNSPEC)
-				invarg("\"remote\" address family is AF_UNSPEC", *argv);
+			get_addr(&addr, *argv, AF_INET6);
 			memcpy(&raddr, &addr.data, sizeof(raddr));
 		} else if (!matches(*argv, "local")) {
 			inet_prefix addr;
 
 			NEXT_ARG();
-			get_prefix(&addr, *argv, preferred_family);
-			if (addr.family == AF_UNSPEC)
-				invarg("\"local\" address family is AF_UNSPEC", *argv);
+			get_addr(&addr, *argv, AF_INET6);
 			memcpy(&laddr, &addr.data, sizeof(laddr));
 		} else if (!matches(*argv, "dev")) {
 			NEXT_ARG();
diff --git a/ip/link_ip6tnl.c b/ip/link_ip6tnl.c
index 43287ab..4ab337f 100644
--- a/ip/link_ip6tnl.c
+++ b/ip/link_ip6tnl.c
@@ -184,18 +184,14 @@ get_failed:
 			inet_prefix addr;
 
 			NEXT_ARG();
-			get_prefix(&addr, *argv, preferred_family);
-			if (addr.family == AF_UNSPEC)
-				invarg("\"remote\" address family is AF_UNSPEC", *argv);
-			memcpy(&raddr, addr.data, addr.bytelen);
+			get_addr(&addr, *argv, AF_INET6);
+			memcpy(&raddr, addr.data, sizeof(raddr));
 		} else if (strcmp(*argv, "local") == 0) {
 			inet_prefix addr;
 
 			NEXT_ARG();
-			get_prefix(&addr, *argv, preferred_family);
-			if (addr.family == AF_UNSPEC)
-				invarg("\"local\" address family is AF_UNSPEC", *argv);
-			memcpy(&laddr, addr.data, addr.bytelen);
+			get_addr(&addr, *argv, AF_INET6);
+			memcpy(&laddr, addr.data, sizeof(laddr));
 		} else if (matches(*argv, "dev") == 0) {
 			NEXT_ARG();
 			link = if_nametoindex(*argv);
diff --git a/ip/link_vti6.c b/ip/link_vti6.c
index f665520..84824a5 100644
--- a/ip/link_vti6.c
+++ b/ip/link_vti6.c
@@ -164,14 +164,14 @@ get_failed:
 			inet_prefix addr;
 
 			NEXT_ARG();
-			get_prefix(&addr, *argv, AF_INET6);
-			memcpy(&daddr, addr.data, addr.bytelen);
+			get_addr(&addr, *argv, AF_INET6);
+			memcpy(&daddr, addr.data, sizeof(daddr));
 		} else if (!matches(*argv, "local")) {
 			inet_prefix addr;
 
 			NEXT_ARG();
-			get_prefix(&addr, *argv, AF_INET6);
-			memcpy(&saddr, addr.data, addr.bytelen);
+			get_addr(&addr, *argv, AF_INET6);
+			memcpy(&saddr, addr.data, sizeof(saddr));
 		} else if (!matches(*argv, "dev")) {
 			NEXT_ARG();
 			link = if_nametoindex(*argv);
-- 
1.7.10.4