netdev - [PATCH 1/2] iplink_geneve: add ttl configuration at link creation

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Message-Id: <1434393436-4487-2-git-send-email-linville@tuxdriver.com>
Date:	Mon, 15 Jun 2015 14:37:15 -0400
From:	"John W. Linville" <linville@...driver.com>
To:	netdev@...r.kernel.org
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	"John W. Linville" <linville@...driver.com>
Subject: [PATCH 1/2] iplink_geneve: add ttl configuration at link creation

Signed-off-by: John W. Linville <linville@...driver.com>
---
 include/linux/if_link.h |  1 +
 ip/iplink_geneve.c      | 23 ++++++++++++++++++++++-
 man/man8/ip-link.8.in   |  7 +++++++
 3 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index 7720ad34c6b3..2b5268531bef 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -393,6 +393,7 @@ enum {
 	IFLA_GENEVE_UNSPEC,
 	IFLA_GENEVE_ID,
 	IFLA_GENEVE_REMOTE,
+	IFLA_GENEVE_TTL,
 	__IFLA_GENEVE_MAX
 };
 #define IFLA_GENEVE_MAX	(__IFLA_GENEVE_MAX - 1)
diff --git a/ip/iplink_geneve.c b/ip/iplink_geneve.c
index 74703e1ee156..dff08a62d9a9 100644
--- a/ip/iplink_geneve.c
+++ b/ip/iplink_geneve.c
@@ -17,9 +17,11 @@
 static void print_explain(FILE *f)
 {
 	fprintf(f, "Usage: ... geneve id VNI remote ADDR\n");
+	fprintf(f, "                 [ ttl TTL ]\n");
 	fprintf(f, "\n");
 	fprintf(f, "Where: VNI  := 0-16777215\n");
 	fprintf(f, "       ADDR := IP_ADDRESS\n");
+	fprintf(f, "       TTL  := { 1..255 | inherit }\n");
 }
 
 static void explain(void)
@@ -34,7 +36,7 @@ static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
 	int vni_set = 0;
 	__u32 daddr = 0;
 	struct in6_addr daddr6 = IN6ADDR_ANY_INIT;
-
+	__u8 ttl = 0;
 
 	while (argc > 0) {
 		if (!matches(*argv, "id") ||
@@ -52,6 +54,18 @@ static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
 			}
 			if (IN_MULTICAST(ntohl(daddr)))
 				invarg("invalid remote address", *argv);
+		} else if (!matches(*argv, "ttl") ||
+			   !matches(*argv, "hoplimit")) {
+			unsigned uval;
+
+			NEXT_ARG();
+			if (strcmp(*argv, "inherit") != 0) {
+				if (get_unsigned(&uval, *argv, 0))
+					invarg("invalid TTL", *argv);
+				if (uval > 255)
+					invarg("TTL must be <= 255", *argv);
+				ttl = uval;
+			}
 		} else if (matches(*argv, "help") == 0) {
 			explain();
 			return -1;
@@ -80,6 +94,7 @@ static int geneve_parse_opt(struct link_util *lu, int argc, char **argv,
 	addattr32(n, 1024, IFLA_GENEVE_ID, vni);
 	if (daddr)
 		addattr_l(n, 1024, IFLA_GENEVE_REMOTE, &daddr, 4);
+	addattr8(n, 1024, IFLA_GENEVE_TTL, ttl);
 
 	return 0;
 }
@@ -105,6 +120,12 @@ static void geneve_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 			fprintf(f, "remote %s ",
 				format_host(AF_INET, 4, &addr, s1, sizeof(s1)));
 	}
+
+	if (tb[IFLA_GENEVE_TTL]) {
+		__u8 ttl = rta_getattr_u8(tb[IFLA_GENEVE_TTL]);
+		if (ttl)
+			fprintf(f, "ttl %d ", ttl);
+	}
 }
 
 static void geneve_print_help(struct link_util *lu, int argc, char **argv,
diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index 8cac246d7296..51d0c624a023 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -606,6 +606,9 @@ the following additional arguments are supported:
 
 .BI "ip link add " DEVICE
 .BI type " geneve " id " ID " remote " IPADDR"
+.R " [ "
+.BI ttl " TTL "
+.R " ]"
 
 .in +8
 .sp
@@ -616,6 +619,10 @@ the following additional arguments are supported:
 .BI remote " IPADDR"
 - specifies the unicast destination IP address to use in outgoing packets.
 
+.sp
+.BI ttl " TTL"
+- specifies the TTL value to use in outgoing packets.
+
 .in -8
 
 .SS ip link delete - delete virtual link
-- 
2.1.0

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