Hi,
I am trying to make IPv6 over VPLS.
I updated ldpd(8) to install MPLS route for IPv6 nexthop. I can see the routes
but when pinging the destination I get "No route to host". Can someone give me a
pointer for the next step ?
Thank you in advance,
Denis
* Without the patch :
mpls1# route -n show
Routing tables
Internet:
Destination Gateway Flags Refs Use Mtu Prio Iface
[...]
172.16.0/24 192.168.150.139 UGT 0 6 - 32 vio0
Internet6:
Destination Gateway Flags Refs
Use Mtu Prio Iface
[...]
2001:db8::/64 fe80::fcd8:d9ff:fe57:bd48%vio0 UG 0
4 - 32 vio0
2001:db8:1::/64 2001:db8:1::1 UCn 0
0 - 4 vether0
2001:db8:1::1 fe:e1:ba:d0:89:89 UHLl 0
76 - 1 vether0
2001:db8:fffe::/64 fe80::fcd8:d9ff:fe57:bd48%vio0 UG 1
6 - 32 vio0
2001:db8:ffff::/64 2001:db8:ffff::1 UCn 1
2 - 4 vio0
2001:db8:ffff::/64 link#1 UC 0
0 - 32 vio0
2001:db8:ffff::1 9e:21:8a:77:cd:cc UHLl 0
1511 - 1 vio0
2001:db8:ffff::2 fe:d8:d9:57:bd:48 UHLc 0
257 - 3 vio0
MPLS:
In label Out label Op Gateway Flags Refs Use Mtu Prio
Interface
17 - POP 192.168.150.139 UGT 0 0 - 32
vio0
18 16 SWAP 192.168.150.139 UGT 0 0 - 32
vio0
mpls1# route get 2001:db8::/64
route to: 2001:db8::
destination: 2001:db8::
mask: ffff:ffff:ffff:ffff::
gateway: fe80::fcd8:d9ff:fe57:bd48%vio0
interface: vio0
if address: fe80::9c21:8aff:fe77:cdcc%vio0
priority: 32 (ospf)
flags: <UP,GATEWAY,DONE>
use mtu expire
4 0 0
mpls1# ping6 2001:db8::1
PING 2001:db8::1 (2001:db8::1): 56 data bytes
64 bytes from 2001:db8::1: icmp_seq=0 hlim=63 time=1.039 ms
64 bytes from 2001:db8::1: icmp_seq=1 hlim=63 time=1.037 ms
^C
--- 2001:db8::1 ping statistics ---
2 packets transmitted, 2 packets received, 0.0% packet loss
round-trip min/avg/max/std-dev = 1.037/1.038/1.039/0.001 ms
* With the patch :
mpls1# route -n show
Routing tables
Internet:
Destination Gateway Flags Refs Use Mtu Prio Iface
[...]
172.16.0/24 192.168.150.139 UGT 0 6 - 32 vio0
Internet6:
Destination Gateway Flags Refs
Use Mtu Prio Iface
[...]
2001:db8::/64 fe80::fcd8:d9ff:fe57:bd48%vio0 UGT 0
4 - 32 vio0
2001:db8:1::/64 2001:db8:1::1 UCn 0
0 - 4 vether0
2001:db8:1::1 fe:e1:ba:d0:89:89 UHLl 0
76 - 1 vether0
2001:db8:fffe::/64 fe80::fcd8:d9ff:fe57:bd48%vio0 UG 2
7 - 32 vio0
2001:db8:ffff::/64 2001:db8:ffff::1 UCn 1
2 - 4 vio0
2001:db8:ffff::/64 link#1 UC 0
0 - 32 vio0
2001:db8:ffff::1 9e:21:8a:77:cd:cc UHLl 0
1526 - 1 vio0
2001:db8:ffff::2 fe:d8:d9:57:bd:48 UHLc 0
281 - 3 vio0
MPLS:
In label Out label Op Gateway Flags Refs Use Mtu Prio
Interface
17 - POP 192.168.150.139 UGT 0 0 - 32
vio0
18 16 SWAP 192.168.150.139 UGT 0 0 - 32
vio0
19 18 SWAP fe80::fcd8:d9ff:fe57:bd48%vio0 UGT 0 0
- 32 vio0
20 - POP fe80::fcd8:d9ff:fe57:bd48%vio0 UGT 0 0
- 32 vio0
21 - LOCAL ::1%3 UGT 0 0 32768 8
lo0
22 - LOCAL ::1%3 UGT 0 0 32768 8
lo0
23 - LOCAL ::1%3 UGT 0 0 32768 8
lo0
24 - LOCAL ::1%3 UGT 0 0 32768 8
lo0
mpls1# route get 2001:db8::/64
route to: 2001:db8::
destination: 2001:db8::
mask: ffff:ffff:ffff:ffff::
gateway: fe80::fcd8:d9ff:fe57:bd48%vio0
interface: vio0
if address: fe80::9c21:8aff:fe77:cdcc%vio0
mpls label: PUSH 18
priority: 32 (ospf)
flags: <UP,GATEWAY,DONE,MPLS>
use mtu expire
4 0 0
sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA,SRC>
mpls1# ping6 2001:db8::1
PING 2001:db8::1 (2001:db8::1): 56 data bytes
ping6: sendmsg: No route to host
ping: wrote 2001:db8::1 64 chars, ret=-1
ping6: sendmsg: No route to host
ping: wrote 2001:db8::1 64 chars, ret=-1
ping6: sendmsg: No route to host
ping: wrote 2001:db8::1 64 chars, ret=-1
^C
--- 2001:db8::1 ping statistics ---
3 packets transmitted, 0 packets received, 100.0% packet loss
* Patch :
Index: kroute.c
===================================================================
RCS file: /cvs/src/usr.sbin/ldpd/kroute.c,v
retrieving revision 1.66
diff -u -p -r1.66 kroute.c
--- kroute.c 24 Jul 2017 11:00:01 -0000 1.66
+++ kroute.c 27 Dec 2017 12:48:59 -0000
@@ -259,7 +259,7 @@ kr_change(struct kroute *kr)
if (ldp_addrisset(kn->r.af, &kn->r.nexthop) &&
kn->r.remote_label != NO_LABEL) {
- if (send_rtmsg(kr_state.fd, RTM_CHANGE, &kn->r, AF_INET) == -1)
+ if (send_rtmsg(kr_state.fd, RTM_CHANGE, &kn->r, kn->r.af) == -1)
return (-1);
}
@@ -305,7 +305,7 @@ kr_delete(struct kroute *kr)
kn->r.remote_label = NO_LABEL;
if (update &&
- send_rtmsg(kr_state.fd, RTM_CHANGE, &kn->r, AF_INET) == -1)
+ send_rtmsg(kr_state.fd, RTM_CHANGE, &kn->r, kn->r.af) == -1)
return (-1);
return (0);
@@ -346,7 +346,7 @@ kr_fib_couple(void)
if (ldp_addrisset(kn->r.af, &kn->r.nexthop) &&
kn->r.remote_label != NO_LABEL) {
send_rtmsg(kr_state.fd, RTM_CHANGE,
- &kn->r, AF_INET);
+ &kn->r, kn->r.af);
}
}
}
@@ -387,7 +387,7 @@ kr_fib_decouple(void)
rl = kn->r.remote_label;
kn->r.remote_label = NO_LABEL;
send_rtmsg(kr_state.fd, RTM_CHANGE,
- &kn->r, AF_INET);
+ &kn->r, kn->r.af);
kn->r.remote_label = rl;
}
}
@@ -1311,6 +1311,145 @@ send_rtmsg_v4(int fd, int action, struct
static int
send_rtmsg_v6(int fd, int action, struct kroute *kr, int family)
{
+ struct iovec iov[5];
+ struct rt_msghdr hdr;
+ struct sockaddr_mpls label_in, label_out;
+ struct sockaddr_in6 dst, mask, nexthop;
+ int iovcnt = 0;
+
+ if (kr_state.fib_sync == 0)
+ return (0);
+
+ /*
+ * Reserved labels (implicit and explicit NULL) should not be added
+ * to the FIB.
+ */
+ if (family == AF_MPLS && kr->local_label < MPLS_LABEL_RESERVED_MAX)
+ return (0);
+
+ /* initialize header */
+ memset(&hdr, 0, sizeof(hdr));
+ hdr.rtm_version = RTM_VERSION;
+
+ hdr.rtm_type = action;
+ hdr.rtm_flags = RTF_UP;
+ hdr.rtm_fmask = RTF_MPLS;
+ hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */
+ hdr.rtm_msglen = sizeof(hdr);
+ hdr.rtm_hdrlen = sizeof(struct rt_msghdr);
+ hdr.rtm_priority = kr->priority;
+ hdr.rtm_tableid = kr_state.rdomain; /* rtableid */
+ /* adjust iovec */
+ iov[iovcnt].iov_base = &hdr;
+ iov[iovcnt++].iov_len = sizeof(hdr);
+
+ if (family == AF_MPLS) {
+ memset(&label_in, 0, sizeof(label_in));
+ label_in.smpls_len = sizeof(label_in);
+ label_in.smpls_family = AF_MPLS;
+ label_in.smpls_label =
+ htonl(kr->local_label << MPLS_LABEL_OFFSET);
+ /* adjust header */
+ hdr.rtm_flags |= RTF_MPLS | RTF_MPATH;
+ hdr.rtm_addrs |= RTA_DST;
+ hdr.rtm_msglen += sizeof(label_in);
+ /* adjust iovec */
+ iov[iovcnt].iov_base = &label_in;
+ iov[iovcnt++].iov_len = sizeof(label_in);
+ } else {
+ memset(&dst, 0, sizeof(dst));
+ dst.sin6_len = sizeof(dst);
+ dst.sin6_family = AF_INET6;
+ dst.sin6_addr = kr->prefix.v6;
+ /* adjust header */
+ hdr.rtm_addrs |= RTA_DST;
+ hdr.rtm_msglen += ROUNDUP(sizeof(dst));
+ /* adjust iovec */
+ iov[iovcnt].iov_base = &dst;
+ iov[iovcnt++].iov_len = ROUNDUP(sizeof(dst));
+ }
+
+ memset(&nexthop, 0, sizeof(nexthop));
+ nexthop.sin6_len = sizeof(nexthop);
+ nexthop.sin6_family = AF_INET6;
+ nexthop.sin6_addr = kr->nexthop.v6;
+ nexthop.sin6_scope_id = kr->ifindex;
+ /*
+ * XXX we should set the sin6_scope_id but the kernel
+ * XXX does not expect it that way. It must be fiddled
+ * XXX into the sin6_addr. Welcome to the typical
+ * XXX IPv6 insanity and all without wine bottles.
+ */
+ embedscope(&nexthop);
+
+ /* adjust header */
+ hdr.rtm_flags |= RTF_GATEWAY;
+ hdr.rtm_addrs |= RTA_GATEWAY;
+ hdr.rtm_msglen += ROUNDUP(sizeof(nexthop));
+ /* adjust iovec */
+ iov[iovcnt].iov_base = &nexthop;
+ iov[iovcnt++].iov_len = ROUNDUP(sizeof(nexthop));
+
+ if (family == AF_INET6) {
+ memset(&mask, 0, sizeof(mask));
+ mask.sin6_len = sizeof(mask);
+ mask.sin6_family = AF_INET6;
+ mask.sin6_addr = *prefixlen2mask6(kr->prefixlen);
+ /* adjust header */
+ if (kr->prefixlen == 128)
+ hdr.rtm_flags |= RTF_HOST;
+ hdr.rtm_addrs |= RTA_NETMASK;
+ hdr.rtm_msglen += ROUNDUP(sizeof(mask));
+ /* adjust iovec */
+ iov[iovcnt].iov_base = &mask;
+ iov[iovcnt++].iov_len = ROUNDUP(sizeof(mask));
+ }
+
+ /* If action is RTM_DELETE we have to get rid of MPLS infos */
+ if (kr->remote_label != NO_LABEL && action != RTM_DELETE) {
+ memset(&label_out, 0, sizeof(label_out));
+ label_out.smpls_len = sizeof(label_out);
+ label_out.smpls_family = AF_MPLS;
+ label_out.smpls_label =
+ htonl(kr->remote_label << MPLS_LABEL_OFFSET);
+ /* adjust header */
+ hdr.rtm_addrs |= RTA_SRC;
+ hdr.rtm_flags |= RTF_MPLS;
+ hdr.rtm_msglen += sizeof(label_out);
+ /* adjust iovec */
+ iov[iovcnt].iov_base = &label_out;
+ iov[iovcnt++].iov_len = sizeof(label_out);
+
+ if (kr->remote_label == MPLS_LABEL_IMPLNULL) {
+ if (family == AF_MPLS)
+ hdr.rtm_mpls = MPLS_OP_POP;
+ else
+ return (0);
+ } else {
+ if (family == AF_MPLS)
+ hdr.rtm_mpls = MPLS_OP_SWAP;
+ else
+ hdr.rtm_mpls = MPLS_OP_PUSH;
+ }
+ }
+
+ retry:
+ if (writev(fd, iov, iovcnt) == -1) {
+ if (errno == ESRCH) {
+ if (hdr.rtm_type == RTM_CHANGE && family == AF_MPLS) {
+ hdr.rtm_type = RTM_ADD;
+ goto retry;
+ } else if (hdr.rtm_type == RTM_DELETE) {
+ log_info("route %s/%u vanished before delete",
+ log_addr(kr->af, &kr->prefix),
kr->prefixlen);
+ return (-1);
+ }
+ }
+ log_warn("%s action %u, af %s, prefix %s/%u", __func__,
+ hdr.rtm_type, af_name(family), log_addr(kr->af,
&kr->prefix),
+ kr->prefixlen);
+ return (-1);
+ }
return (0);
}
