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iproute: Add support for ttl-propagation attribute

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Add support for setting and displaying the ttl-propagation attribute
initially used by MPLS to control propagation of MPLS TTL to IPv4/IPv6
TTL/hop-limit on popping final label on a per-route basis.

Signed-off-by: Robert Shearman <rshearma@brocade.com>
Acked-by: David Ahern <dsa@cumulusnetworks.com>
This commit is contained in:
Robert Shearman 2017-04-11 09:37:20 +01:00 committed by Stephen Hemminger
parent 19beb1aa16
commit c44d18ea96
2 changed files with 31 additions and 1 deletions
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22
ip/iproute.c
View File

@ -77,6 +77,7 @@ static void usage(void)
fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
fprintf(stderr, " [ table TABLE_ID ] [ proto RTPROTO ]\n");
fprintf(stderr, " [ scope SCOPE ] [ metric METRIC ]\n");
fprintf(stderr, " [ ttl-propagate { enabled | disabled } ]\n");
fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
fprintf(stderr, "NH := [ encap ENCAPTYPE ENCAPHDR ] [ via [ FAMILY ] ADDRESS ]\n");
fprintf(stderr, " [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
@ -715,6 +716,13 @@ int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
fprintf(fp, "%u", pref);
}
}
if (tb[RTA_TTL_PROPAGATE]) {
fprintf(fp, "ttl-propagate ");
if (rta_getattr_u8(tb[RTA_TTL_PROPAGATE]))
fprintf(fp, "enabled");
else
fprintf(fp, "disabled");
}
fprintf(fp, "\n");
fflush(fp);
return 0;
@ -1185,6 +1193,20 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
if (rta->rta_len > RTA_LENGTH(0))
addraw_l(&req.n, 1024, RTA_DATA(rta), RTA_PAYLOAD(rta));
} else if (strcmp(*argv, "ttl-propagate") == 0) {
__u8 ttl_prop;
NEXT_ARG();
if (matches(*argv, "enabled") == 0)
ttl_prop = 1;
else if (matches(*argv, "disabled") == 0)
ttl_prop = 0;
else
invarg("\"ttl-propagate\" value is invalid\n",
*argv);
addattr8(&req.n, sizeof(req), RTA_TTL_PROPAGATE,
ttl_prop);
} else {
int type;
inet_prefix dst;

10
man/man8/ip-route.8.in
View File

@ -75,7 +75,9 @@ replace " } "
.B scope
.IR SCOPE " ] [ "
.B metric
.IR METRIC " ]"
.IR METRIC " ] [ "
.B ttl-propagate
.RB "{ " enabled " | " disabled " } ]"
.ti -8
.IR INFO_SPEC " := " "NH OPTIONS FLAGS" " ["
@ -710,6 +712,12 @@ is a set of encapsulation attributes specific to the
the route will be deleted after the expires time.
.B Only
support IPv6 at present.
.TP
.BR ttl-propagate " { " enabled " | " disabled " } "
Control whether TTL should be propagated from any encap into the
un-encapsulated packet, overriding any global configuration. Only
supported for MPLS at present.
.RE
.TP