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/* Zebra PW code
* Copyright (C) 2016 Volta Networks, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <zebra.h>
#include "log.h"
#include "memory.h"
#include "thread.h"
#include "command.h"
#include "vrf.h"
#include "zebra/debug.h"
#include "zebra/rib.h"
#include "zebra/zserv.h"
#include "zebra/zapi_msg.h"
#include "zebra/zebra_rnh.h"
#include "zebra/zebra_vrf.h"
#include "zebra/zebra_pw.h"
DEFINE_MTYPE_STATIC(LIB, PW, "Pseudowire")
DEFINE_QOBJ_TYPE(zebra_pw)
DEFINE_HOOK(pw_install, (struct zebra_pw * pw), (pw))
DEFINE_HOOK(pw_uninstall, (struct zebra_pw * pw), (pw))
#define MPLS_NO_LABEL MPLS_INVALID_LABEL
extern struct zebra_t zebrad;
static int zebra_pw_enabled(struct zebra_pw *);
static void zebra_pw_install(struct zebra_pw *);
static void zebra_pw_uninstall(struct zebra_pw *);
static int zebra_pw_install_retry(struct thread *);
static int zebra_pw_check_reachability(struct zebra_pw *);
static void zebra_pw_update_status(struct zebra_pw *, int);
static inline int zebra_pw_compare(const struct zebra_pw *a,
const struct zebra_pw *b)
{
return (strcmp(a->ifname, b->ifname));
}
RB_GENERATE(zebra_pw_head, zebra_pw, pw_entry, zebra_pw_compare)
RB_GENERATE(zebra_static_pw_head, zebra_pw, static_pw_entry, zebra_pw_compare)
struct zebra_pw *zebra_pw_add(struct zebra_vrf *zvrf, const char *ifname,
uint8_t protocol, struct zserv *client)
{
struct zebra_pw *pw;
if (IS_ZEBRA_DEBUG_PW)
zlog_debug("%u: adding pseudowire %s protocol %s",
zvrf_id(zvrf), ifname, zebra_route_string(protocol));
pw = XCALLOC(MTYPE_PW, sizeof(*pw));
strlcpy(pw->ifname, ifname, sizeof(pw->ifname));
pw->protocol = protocol;
pw->vrf_id = zvrf_id(zvrf);
pw->client = client;
pw->status = PW_STATUS_DOWN;
pw->local_label = MPLS_NO_LABEL;
pw->remote_label = MPLS_NO_LABEL;
pw->flags = F_PSEUDOWIRE_CWORD;
RB_INSERT(zebra_pw_head, &zvrf->pseudowires, pw);
if (pw->protocol == ZEBRA_ROUTE_STATIC) {
RB_INSERT(zebra_static_pw_head, &zvrf->static_pseudowires, pw);
QOBJ_REG(pw, zebra_pw);
}
return pw;
}
void zebra_pw_del(struct zebra_vrf *zvrf, struct zebra_pw *pw)
{
if (IS_ZEBRA_DEBUG_PW)
zlog_debug("%u: deleting pseudowire %s protocol %s", pw->vrf_id,
pw->ifname, zebra_route_string(pw->protocol));
/* remove nexthop tracking */
zebra_deregister_rnh_pseudowire(pw->vrf_id, pw);
/* uninstall */
if (pw->status == PW_STATUS_UP)
hook_call(pw_uninstall, pw);
else if (pw->install_retry_timer)
THREAD_TIMER_OFF(pw->install_retry_timer);
/* unlink and release memory */
RB_REMOVE(zebra_pw_head, &zvrf->pseudowires, pw);
if (pw->protocol == ZEBRA_ROUTE_STATIC)
RB_REMOVE(zebra_static_pw_head, &zvrf->static_pseudowires, pw);
XFREE(MTYPE_PW, pw);
}
void zebra_pw_change(struct zebra_pw *pw, ifindex_t ifindex, int type, int af,
union g_addr *nexthop, uint32_t local_label,
uint32_t remote_label, uint8_t flags,
union pw_protocol_fields *data)
{
zebra_deregister_rnh_pseudowire(pw->vrf_id, pw);
pw->ifindex = ifindex;
pw->type = type;
pw->af = af;
pw->nexthop = *nexthop;
pw->local_label = local_label;
pw->remote_label = remote_label;
pw->flags = flags;
pw->data = *data;
if (zebra_pw_enabled(pw))
zebra_register_rnh_pseudowire(pw->vrf_id, pw);
else
zebra_pw_uninstall(pw);
}
struct zebra_pw *zebra_pw_find(struct zebra_vrf *zvrf, const char *ifname)
{
struct zebra_pw pw;
strlcpy(pw.ifname, ifname, sizeof(pw.ifname));
return (RB_FIND(zebra_pw_head, &zvrf->pseudowires, &pw));
}
static int zebra_pw_enabled(struct zebra_pw *pw)
{
if (pw->protocol == ZEBRA_ROUTE_STATIC) {
if (pw->local_label == MPLS_NO_LABEL
|| pw->remote_label == MPLS_NO_LABEL || pw->af == AF_UNSPEC)
return 0;
return 1;
} else
return pw->enabled;
}
void zebra_pw_update(struct zebra_pw *pw)
{
if (zebra_pw_check_reachability(pw) < 0) {
zebra_pw_uninstall(pw);
/* wait for NHT and try again later */
} else {
/*
* Install or reinstall the pseudowire (e.g. to update
* parameters like the nexthop or the use of the control word).
*/
zebra_pw_install(pw);
}
}
static void zebra_pw_install(struct zebra_pw *pw)
{
if (IS_ZEBRA_DEBUG_PW)
zlog_debug("%u: installing pseudowire %s protocol %s",
pw->vrf_id, pw->ifname,
zebra_route_string(pw->protocol));
if (hook_call(pw_install, pw)) {
zebra_pw_install_failure(pw);
return;
}
if (pw->status == PW_STATUS_DOWN)
zebra_pw_update_status(pw, PW_STATUS_UP);
}
static void zebra_pw_uninstall(struct zebra_pw *pw)
{
if (pw->status == PW_STATUS_DOWN)
return;
if (IS_ZEBRA_DEBUG_PW)
zlog_debug("%u: uninstalling pseudowire %s protocol %s",
pw->vrf_id, pw->ifname,
zebra_route_string(pw->protocol));
/* ignore any possible error */
hook_call(pw_uninstall, pw);
if (zebra_pw_enabled(pw))
zebra_pw_update_status(pw, PW_STATUS_DOWN);
}
/*
* Installation of the pseudowire in the kernel or hardware has failed. This
* function will notify the pseudowire client about the failure and schedule
* to retry the installation later. This function can be called by an external
* agent that performs the pseudowire installation in an asynchronous way.
*/
void zebra_pw_install_failure(struct zebra_pw *pw)
{
if (IS_ZEBRA_DEBUG_PW)
zlog_debug(
"%u: failed installing pseudowire %s, "
"scheduling retry in %u seconds",
pw->vrf_id, pw->ifname, PW_INSTALL_RETRY_INTERVAL);
/* schedule to retry later */
THREAD_TIMER_OFF(pw->install_retry_timer);
thread_add_timer(zebrad.master, zebra_pw_install_retry, pw,
PW_INSTALL_RETRY_INTERVAL, &pw->install_retry_timer);
zebra_pw_update_status(pw, PW_STATUS_DOWN);
}
static int zebra_pw_install_retry(struct thread *thread)
{
struct zebra_pw *pw = THREAD_ARG(thread);
pw->install_retry_timer = NULL;
zebra_pw_install(pw);
return 0;
}
static void zebra_pw_update_status(struct zebra_pw *pw, int status)
{
pw->status = status;
if (pw->client)
zsend_pw_update(pw->client, pw);
}
static int zebra_pw_check_reachability(struct zebra_pw *pw)
{
struct route_entry *re;
struct nexthop *nexthop;
/* TODO: consider GRE/L2TPv3 tunnels in addition to MPLS LSPs */
/* find route to the remote end of the pseudowire */
re = rib_match(family2afi(pw->af), SAFI_UNICAST, pw->vrf_id,
&pw->nexthop, NULL);
if (!re) {
if (IS_ZEBRA_DEBUG_PW)
zlog_warn("%s: no route found for %s", __func__,
pw->ifname);
return -1;
}
/*
* Need to ensure that there's a label binding for all nexthops.
* Otherwise, ECMP for this route could render the pseudowire unusable.
*/
for (ALL_NEXTHOPS(re->ng, nexthop)) {
if (!nexthop->nh_label) {
if (IS_ZEBRA_DEBUG_PW)
zlog_warn("%s: unlabeled route for %s",
__func__, pw->ifname);
return -1;
}
}
return 0;
}
static int zebra_pw_client_close(struct zserv *client)
{
struct vrf *vrf;
struct zebra_vrf *zvrf;
struct zebra_pw *pw, *tmp;
RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id) {
zvrf = vrf->info;
RB_FOREACH_SAFE (pw, zebra_pw_head, &zvrf->pseudowires, tmp) {
if (pw->client != client)
continue;
zebra_pw_del(zvrf, pw);
}
}
return 0;
}
void zebra_pw_init(struct zebra_vrf *zvrf)
{
RB_INIT(zebra_pw_head, &zvrf->pseudowires);
RB_INIT(zebra_static_pw_head, &zvrf->static_pseudowires);
hook_register(zapi_client_close, zebra_pw_client_close);
}
void zebra_pw_exit(struct zebra_vrf *zvrf)
{
struct zebra_pw *pw;
while (!RB_EMPTY(zebra_pw_head, &zvrf->pseudowires)) {
pw = RB_ROOT(zebra_pw_head, &zvrf->pseudowires);
zebra_pw_del(zvrf, pw);
}
}
DEFUN_NOSH (pseudowire_if,
pseudowire_if_cmd,
"[no] pseudowire IFNAME",
NO_STR
"Static pseudowire configuration\n"
"Pseudowire name\n")
{
struct zebra_vrf *zvrf;
struct zebra_pw *pw;
int idx = 0;
const char *ifname;
zvrf = vrf_info_lookup(VRF_DEFAULT);
if (!zvrf)
return CMD_WARNING;
argv_find(argv, argc, "IFNAME", &idx);
ifname = argv[idx]->arg;
pw = zebra_pw_find(zvrf, ifname);
if (pw && pw->protocol != ZEBRA_ROUTE_STATIC) {
vty_out(vty, "%% Pseudowire is not static\n");
return CMD_WARNING;
}
if (argv_find(argv, argc, "no", &idx)) {
if (!pw)
return CMD_SUCCESS;
zebra_pw_del(zvrf, pw);
return CMD_SUCCESS;
}
if (!pw)
pw = zebra_pw_add(zvrf, ifname, ZEBRA_ROUTE_STATIC, NULL);
VTY_PUSH_CONTEXT(PW_NODE, pw);
return CMD_SUCCESS;
}
DEFUN (pseudowire_labels,
pseudowire_labels_cmd,
"[no] mpls label local (16-1048575) remote (16-1048575)",
NO_STR
"MPLS L2VPN PW command\n"
"MPLS L2VPN static labels\n"
"Local pseudowire label\n"
"Local pseudowire label\n"
"Remote pseudowire label\n"
"Remote pseudowire label\n")
{
VTY_DECLVAR_CONTEXT(zebra_pw, pw);
int idx = 0;
mpls_label_t local_label, remote_label;
if (argv_find(argv, argc, "no", &idx)) {
local_label = MPLS_NO_LABEL;
remote_label = MPLS_NO_LABEL;
} else {
argv_find(argv, argc, "local", &idx);
local_label = atoi(argv[idx + 1]->arg);
argv_find(argv, argc, "remote", &idx);
remote_label = atoi(argv[idx + 1]->arg);
}
zebra_pw_change(pw, pw->ifindex, pw->type, pw->af, &pw->nexthop,
local_label, remote_label, pw->flags, &pw->data);
return CMD_SUCCESS;
}
DEFUN (pseudowire_neighbor,
pseudowire_neighbor_cmd,
"[no] neighbor <A.B.C.D|X:X::X:X>",
NO_STR
"Specify the IPv4 or IPv6 address of the remote endpoint\n"
"IPv4 address\n"
"IPv6 address\n")
{
VTY_DECLVAR_CONTEXT(zebra_pw, pw);
int idx = 0;
const char *address;
int af;
union g_addr nexthop;
af = AF_UNSPEC;
memset(&nexthop, 0, sizeof(nexthop));
if (!argv_find(argv, argc, "no", &idx)) {
argv_find(argv, argc, "neighbor", &idx);
address = argv[idx + 1]->arg;
if (inet_pton(AF_INET, address, &nexthop.ipv4) == 1)
af = AF_INET;
else if (inet_pton(AF_INET6, address, &nexthop.ipv6) == 1)
af = AF_INET6;
else {
vty_out(vty, "%% Malformed address\n");
return CMD_WARNING;
}
}
zebra_pw_change(pw, pw->ifindex, pw->type, af, &nexthop,
pw->local_label, pw->remote_label, pw->flags,
&pw->data);
return CMD_SUCCESS;
}
DEFUN (pseudowire_control_word,
pseudowire_control_word_cmd,
"[no] control-word <exclude|include>",
NO_STR
"Control-word options\n"
"Exclude control-word in pseudowire packets\n"
"Include control-word in pseudowire packets\n")
{
VTY_DECLVAR_CONTEXT(zebra_pw, pw);
int idx = 0;
uint8_t flags = 0;
if (argv_find(argv, argc, "no", &idx))
flags = F_PSEUDOWIRE_CWORD;
else {
argv_find(argv, argc, "control-word", &idx);
if (argv[idx + 1]->text[0] == 'i')
flags = F_PSEUDOWIRE_CWORD;
}
zebra_pw_change(pw, pw->ifindex, pw->type, pw->af, &pw->nexthop,
pw->local_label, pw->remote_label, flags, &pw->data);
return CMD_SUCCESS;
}
DEFUN (show_pseudowires,
show_pseudowires_cmd,
"show mpls pseudowires",
SHOW_STR
MPLS_STR
"Pseudowires\n")
{
struct zebra_vrf *zvrf;
struct zebra_pw *pw;
zvrf = vrf_info_lookup(VRF_DEFAULT);
if (!zvrf)
return 0;
vty_out(vty, "%-16s %-24s %-12s %-8s %-10s\n", "Interface", "Neighbor",
"Labels", "Protocol", "Status");
RB_FOREACH (pw, zebra_pw_head, &zvrf->pseudowires) {
char buf_nbr[INET6_ADDRSTRLEN];
char buf_labels[64];
inet_ntop(pw->af, &pw->nexthop, buf_nbr, sizeof(buf_nbr));
if (pw->local_label != MPLS_NO_LABEL
&& pw->remote_label != MPLS_NO_LABEL)
snprintf(buf_labels, sizeof(buf_labels), "%u/%u",
pw->local_label, pw->remote_label);
else
snprintf(buf_labels, sizeof(buf_labels), "-");
vty_out(vty, "%-16s %-24s %-12s %-8s %-10s\n", pw->ifname,
(pw->af != AF_UNSPEC) ? buf_nbr : "-", buf_labels,
zebra_route_string(pw->protocol),
(zebra_pw_enabled(pw) && pw->status == PW_STATUS_UP)
? "UP"
: "DOWN");
}
return CMD_SUCCESS;
}
/* Pseudowire configuration write function. */
static int zebra_pw_config(struct vty *vty)
{
int write = 0;
struct zebra_vrf *zvrf;
struct zebra_pw *pw;
zvrf = vrf_info_lookup(VRF_DEFAULT);
if (!zvrf)
return 0;
RB_FOREACH (pw, zebra_static_pw_head, &zvrf->static_pseudowires) {
vty_out(vty, "pseudowire %s\n", pw->ifname);
if (pw->local_label != MPLS_NO_LABEL
&& pw->remote_label != MPLS_NO_LABEL)
vty_out(vty, " mpls label local %u remote %u\n",
pw->local_label, pw->remote_label);
else
vty_out(vty,
" ! Incomplete config, specify the static "
"MPLS labels\n");
if (pw->af != AF_UNSPEC) {
char buf[INET6_ADDRSTRLEN];
inet_ntop(pw->af, &pw->nexthop, buf, sizeof(buf));
vty_out(vty, " neighbor %s\n", buf);
} else
vty_out(vty,
" ! Incomplete config, specify a neighbor "
"address\n");
if (!(pw->flags & F_PSEUDOWIRE_CWORD))
vty_out(vty, " control-word exclude\n");
vty_out(vty, "!\n");
write = 1;
}
return write;
}
static struct cmd_node pw_node = {
PW_NODE, "%s(config-pw)# ", 1,
};
void zebra_pw_vty_init(void)
{
install_node(&pw_node, zebra_pw_config);
install_default(PW_NODE);
install_element(CONFIG_NODE, &pseudowire_if_cmd);
install_element(PW_NODE, &pseudowire_labels_cmd);
install_element(PW_NODE, &pseudowire_neighbor_cmd);
install_element(PW_NODE, &pseudowire_control_word_cmd);
install_element(VIEW_NODE, &show_pseudowires_cmd);
}
|