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ip route: Add option to use nexthop objects

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Add nhid option for routes to use nexthop objects by id.

Example:
  $ ip nexthop add id 1 via 10.99.1.2 dev veth1
  $ ip route add 10.100.1.0/24 nhid 1
  $ ip route ls
  ...
  10.100.1.0/24 nhid 1 via 10.99.1.2 dev veth1

Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
David Ahern 2019-06-07 15:38:15 -07:00
parent 42cce67e71
commit 12387e2c14
2 changed files with 24 additions and 3 deletions
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14
ip/iproute.c
View File

@ -80,7 +80,7 @@ static void usage(void)
" [ table TABLE_ID ] [ proto RTPROTO ]\n"
" [ scope SCOPE ] [ metric METRIC ]\n"
" [ ttl-propagate { enabled | disabled } ]\n"
"INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n"
"INFO_SPEC := { NH | nhid ID } OPTIONS FLAGS [ nexthop NH ]...\n"
"NH := [ encap ENCAPTYPE ENCAPHDR ] [ via [ FAMILY ] ADDRESS ]\n"
" [ dev STRING ] [ weight NUMBER ] NHFLAGS\n"
"FAMILY := [ inet | inet6 | mpls | bridge | link ]\n"
@ -809,6 +809,10 @@ int print_route(struct nlmsghdr *n, void *arg)
print_string(PRINT_ANY, "src", "from %s ", b1);
}
if (tb[RTA_NH_ID])
print_uint(PRINT_ANY, "nhid", "nhid %u ",
rta_getattr_u32(tb[RTA_NH_ID]));
if (tb[RTA_NEWDST])
print_rta_newdst(fp, r, tb[RTA_NEWDST]);
@ -1080,6 +1084,7 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
int table_ok = 0;
int raw = 0;
int type_ok = 0;
__u32 nhid = 0;
if (cmd != RTM_DELROUTE) {
req.r.rtm_protocol = RTPROT_BOOT;
@ -1358,6 +1363,11 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
} else if (strcmp(*argv, "nexthop") == 0) {
nhs_ok = 1;
break;
} else if (!strcmp(*argv, "nhid")) {
NEXT_ARG();
if (get_u32(&nhid, *argv, 0))
invarg("\"id\" value is invalid\n", *argv);
addattr32(&req.n, sizeof(req), RTA_NH_ID, nhid);
} else if (matches(*argv, "protocol") == 0) {
__u32 prot;
@ -1520,7 +1530,7 @@ static int iproute_modify(int cmd, unsigned int flags, int argc, char **argv)
req.r.rtm_type == RTN_UNSPEC) {
if (cmd == RTM_DELROUTE)
req.r.rtm_scope = RT_SCOPE_NOWHERE;
else if (!gw_ok && !nhs_ok)
else if (!gw_ok && !nhs_ok && !nhid)
req.r.rtm_scope = RT_SCOPE_LINK;
}
}

13
man/man8/ip-route.8.in
View File

@ -89,7 +89,9 @@ replace " } "
.RB "{ " enabled " | " disabled " } ]"
.ti -8
.IR INFO_SPEC " := " "NH OPTIONS FLAGS" " ["
.IR INFO_SPEC " := { " NH " | "
.B nhid
.IR ID " } " "OPTIONS FLAGS" " ["
.B nexthop
.IR NH " ] ..."
@ -686,6 +688,10 @@ Discovery messages. Namely:
- the route has a highest priority
.sp
.TP
.BI nhid " ID"
use nexthop object with given id as nexthop specification.
.sp
.TP
.BI encap " ENCAPTYPE ENCAPHDR"
attach tunnel encapsulation attributes to this route.
@ -1154,6 +1160,11 @@ ip -6 route add 2001:db8:1::/64 encap seg6 mode encap segs 2001:db8:42::1,2001:d
.RS 4
Adds an IPv6 route with SRv6 encapsulation and two segments attached.
.RE
.PP
ip route add 10.1.1.0/30 nhid 10
.RS 4
Adds an ipv4 route using nexthop object with id 10.
.RE
.SH SEE ALSO
.br
.BR ip (8)