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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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