mirror of
https://git.proxmox.com/git/mirror_frr
synced 2025-08-06 06:02:26 +00:00
zebra: data plane plugin for FPM netlink
Initial import of the new zebra data plane plugin for FPM netlink. Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>
This commit is contained in:
Rafael Zalamena
parent
f73a84672d
commit
d35f447d67
445
zebra/dplane_fpm_nl.c
Normal file
445
zebra/dplane_fpm_nl.c
Normal file
@ -0,0 +1,445 @@
|
||||
/*
|
||||
* Zebra dataplane plugin for Forwarding Plane Manager (FPM) using netlink.
|
||||
*
|
||||
* Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
|
||||
* Rafael Zalamena
|
||||
*
|
||||
* 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 <arpa/inet.h>
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/socket.h>
|
||||
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
|
||||
#include "config.h" /* Include this explicitly */
|
||||
#include "lib/zebra.h"
|
||||
#include "lib/libfrr.h"
|
||||
#include "lib/memory.h"
|
||||
#include "lib/network.h"
|
||||
#include "lib/ns.h"
|
||||
#include "lib/frr_pthread.h"
|
||||
#include "zebra/zebra_dplane.h"
|
||||
#include "zebra/kernel_netlink.h"
|
||||
#include "zebra/rt_netlink.h"
|
||||
#include "zebra/debug.h"
|
||||
|
||||
#define SOUTHBOUND_DEFAULT_ADDR INADDR_LOOPBACK
|
||||
#define SOUTHBOUND_DEFAULT_PORT 2620
|
||||
|
||||
static const char *prov_name = "dplane_fpm_nl";
|
||||
|
||||
struct fpm_nl_ctx {
|
||||
/* data plane connection. */
|
||||
int socket;
|
||||
bool connecting;
|
||||
struct sockaddr_storage addr;
|
||||
|
||||
/* data plane buffers. */
|
||||
struct stream *ibuf;
|
||||
struct stream *obuf;
|
||||
pthread_mutex_t obuf_mutex;
|
||||
|
||||
/* data plane events. */
|
||||
struct frr_pthread *fthread;
|
||||
struct thread *t_connect;
|
||||
struct thread *t_read;
|
||||
struct thread *t_write;
|
||||
};
|
||||
|
||||
/*
|
||||
* FPM functions.
|
||||
*/
|
||||
static int fpm_connect(struct thread *t);
|
||||
|
||||
static void fpm_reconnect(struct fpm_nl_ctx *fnc)
|
||||
{
|
||||
/* Grab the lock to empty the stream and stop the zebra thread. */
|
||||
frr_mutex_lock_autounlock(&fnc->obuf_mutex);
|
||||
|
||||
close(fnc->socket);
|
||||
fnc->socket = -1;
|
||||
stream_reset(fnc->ibuf);
|
||||
stream_reset(fnc->obuf);
|
||||
THREAD_OFF(fnc->t_read);
|
||||
THREAD_OFF(fnc->t_write);
|
||||
thread_add_timer(fnc->fthread->master, fpm_connect, fnc, 3,
|
||||
&fnc->t_connect);
|
||||
}
|
||||
|
||||
static int fpm_read(struct thread *t)
|
||||
{
|
||||
struct fpm_nl_ctx *fnc = THREAD_ARG(t);
|
||||
ssize_t rv;
|
||||
|
||||
/* Let's ignore the input at the moment. */
|
||||
rv = stream_read_try(fnc->ibuf, fnc->socket,
|
||||
STREAM_WRITEABLE(fnc->ibuf));
|
||||
if (rv == 0) {
|
||||
zlog_debug("%s: connection closed", __func__);
|
||||
fpm_reconnect(fnc);
|
||||
return 0;
|
||||
}
|
||||
if (rv == -1) {
|
||||
if (errno == EAGAIN || errno == EWOULDBLOCK
|
||||
|| errno == EINTR)
|
||||
return 0;
|
||||
|
||||
zlog_debug("%s: connection failure: %s", __func__,
|
||||
strerror(errno));
|
||||
fpm_reconnect(fnc);
|
||||
return 0;
|
||||
}
|
||||
stream_reset(fnc->ibuf);
|
||||
|
||||
thread_add_read(fnc->fthread->master, fpm_read, fnc, fnc->socket,
|
||||
&fnc->t_read);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fpm_write(struct thread *t)
|
||||
{
|
||||
struct fpm_nl_ctx *fnc = THREAD_ARG(t);
|
||||
socklen_t statuslen;
|
||||
ssize_t bwritten;
|
||||
int rv, status;
|
||||
size_t btotal;
|
||||
|
||||
if (fnc->connecting == true) {
|
||||
status = 0;
|
||||
statuslen = sizeof(status);
|
||||
|
||||
rv = getsockopt(fnc->socket, SOL_SOCKET, SO_ERROR, &status,
|
||||
&statuslen);
|
||||
if (rv == -1 || status != 0) {
|
||||
if (rv != -1)
|
||||
zlog_debug("%s: connection failed: %s",
|
||||
__func__, strerror(status));
|
||||
else
|
||||
zlog_debug("%s: SO_ERROR failed: %s", __func__,
|
||||
strerror(status));
|
||||
|
||||
fpm_reconnect(fnc);
|
||||
return 0;
|
||||
}
|
||||
|
||||
fnc->connecting = false;
|
||||
}
|
||||
|
||||
frr_mutex_lock_autounlock(&fnc->obuf_mutex);
|
||||
|
||||
while (true) {
|
||||
/* Stream is empty: reset pointers and return. */
|
||||
if (STREAM_READABLE(fnc->obuf) == 0) {
|
||||
stream_reset(fnc->obuf);
|
||||
break;
|
||||
}
|
||||
|
||||
/* Try to write all at once. */
|
||||
btotal = stream_get_endp(fnc->obuf) -
|
||||
stream_get_getp(fnc->obuf);
|
||||
bwritten = write(fnc->socket, stream_pnt(fnc->obuf), btotal);
|
||||
if (bwritten == 0) {
|
||||
zlog_debug("%s: connection closed", __func__);
|
||||
break;
|
||||
}
|
||||
if (bwritten == -1) {
|
||||
if (errno == EAGAIN || errno == EWOULDBLOCK
|
||||
|| errno == EINTR)
|
||||
break;
|
||||
|
||||
zlog_debug("%s: connection failure: %s", __func__,
|
||||
strerror(errno));
|
||||
fpm_reconnect(fnc);
|
||||
break;
|
||||
}
|
||||
|
||||
stream_forward_getp(fnc->obuf, (size_t)bwritten);
|
||||
}
|
||||
|
||||
/* Stream is not empty yet, we must schedule more writes. */
|
||||
if (STREAM_READABLE(fnc->obuf)) {
|
||||
thread_add_write(fnc->fthread->master, fpm_write, fnc,
|
||||
fnc->socket, &fnc->t_write);
|
||||
return 0;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fpm_connect(struct thread *t)
|
||||
{
|
||||
struct fpm_nl_ctx *fnc = THREAD_ARG(t);
|
||||
struct sockaddr_in *sin;
|
||||
int rv, sock;
|
||||
char addrstr[INET6_ADDRSTRLEN];
|
||||
|
||||
sock = socket(AF_INET, SOCK_STREAM, 0);
|
||||
if (sock == -1) {
|
||||
zlog_err("%s: fpm connection failed: %s", __func__,
|
||||
strerror(errno));
|
||||
thread_add_timer(fnc->fthread->master, fpm_connect, fnc, 3,
|
||||
&fnc->t_connect);
|
||||
return 0;
|
||||
}
|
||||
|
||||
set_nonblocking(sock);
|
||||
|
||||
sin = (struct sockaddr_in *)&fnc->addr;
|
||||
memset(sin, 0, sizeof(*sin));
|
||||
sin->sin_family = AF_INET;
|
||||
sin->sin_addr.s_addr = htonl(SOUTHBOUND_DEFAULT_ADDR);
|
||||
sin->sin_port = htons(SOUTHBOUND_DEFAULT_PORT);
|
||||
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
|
||||
sin->sin_len = sizeof(sin);
|
||||
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_LEN */
|
||||
|
||||
inet_ntop(AF_INET, &sin->sin_addr, addrstr, sizeof(addrstr));
|
||||
zlog_debug("%s: attempting to connect to %s:%d", __func__, addrstr,
|
||||
ntohs(sin->sin_port));
|
||||
|
||||
rv = connect(sock, (struct sockaddr *)sin, sizeof(*sin));
|
||||
if (rv == -1 && errno != EINPROGRESS) {
|
||||
close(sock);
|
||||
zlog_warn("%s: fpm connection failed: %s", __func__,
|
||||
strerror(errno));
|
||||
thread_add_timer(fnc->fthread->master, fpm_connect, fnc, 3,
|
||||
&fnc->t_connect);
|
||||
return 0;
|
||||
}
|
||||
|
||||
fnc->connecting = (errno == EINPROGRESS);
|
||||
fnc->socket = sock;
|
||||
thread_add_read(fnc->fthread->master, fpm_read, fnc, sock,
|
||||
&fnc->t_read);
|
||||
thread_add_write(fnc->fthread->master, fpm_write, fnc, sock,
|
||||
&fnc->t_write);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* Encode data plane operation context into netlink and enqueue it in the FPM
|
||||
* output buffer.
|
||||
*
|
||||
* @param fnc the netlink FPM context.
|
||||
* @param ctx the data plane operation context data.
|
||||
* @return 0 on success or -1 on not enough space.
|
||||
*/
|
||||
static int fpm_nl_enqueue(struct fpm_nl_ctx *fnc, struct zebra_dplane_ctx *ctx)
|
||||
{
|
||||
uint8_t nl_buf[NL_PKT_BUF_SIZE];
|
||||
size_t nl_buf_len;
|
||||
ssize_t rv;
|
||||
|
||||
nl_buf_len = 0;
|
||||
|
||||
frr_mutex_lock_autounlock(&fnc->obuf_mutex);
|
||||
|
||||
switch (dplane_ctx_get_op(ctx)) {
|
||||
case DPLANE_OP_ROUTE_UPDATE:
|
||||
case DPLANE_OP_ROUTE_DELETE:
|
||||
rv = netlink_route_multipath(RTM_DELROUTE, ctx, nl_buf,
|
||||
sizeof(nl_buf));
|
||||
if (rv <= 0) {
|
||||
zlog_debug("%s: netlink_route_multipath failed",
|
||||
__func__);
|
||||
return 0;
|
||||
}
|
||||
|
||||
nl_buf_len = (size_t)rv;
|
||||
if (STREAM_WRITEABLE(fnc->obuf) < nl_buf_len) {
|
||||
zlog_debug("%s: not enough output buffer (%ld vs %lu)",
|
||||
__func__, STREAM_WRITEABLE(fnc->obuf),
|
||||
nl_buf_len);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* UPDATE operations need a INSTALL, otherwise just quit. */
|
||||
if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_DELETE)
|
||||
break;
|
||||
|
||||
/* FALL THROUGH */
|
||||
case DPLANE_OP_ROUTE_INSTALL:
|
||||
rv = netlink_route_multipath(RTM_NEWROUTE, ctx,
|
||||
&nl_buf[nl_buf_len],
|
||||
sizeof(nl_buf) - nl_buf_len);
|
||||
if (rv <= 0) {
|
||||
zlog_debug("%s: netlink_route_multipath failed",
|
||||
__func__);
|
||||
return 0;
|
||||
}
|
||||
|
||||
nl_buf_len += (size_t)rv;
|
||||
if (STREAM_WRITEABLE(fnc->obuf) < nl_buf_len) {
|
||||
zlog_debug("%s: not enough output buffer (%ld vs %lu)",
|
||||
__func__, STREAM_WRITEABLE(fnc->obuf),
|
||||
nl_buf_len);
|
||||
return -1;
|
||||
}
|
||||
break;
|
||||
|
||||
case DPLANE_OP_NH_INSTALL:
|
||||
case DPLANE_OP_NH_UPDATE:
|
||||
case DPLANE_OP_NH_DELETE:
|
||||
case DPLANE_OP_LSP_INSTALL:
|
||||
case DPLANE_OP_LSP_UPDATE:
|
||||
case DPLANE_OP_LSP_DELETE:
|
||||
case DPLANE_OP_PW_INSTALL:
|
||||
case DPLANE_OP_PW_UNINSTALL:
|
||||
case DPLANE_OP_ADDR_INSTALL:
|
||||
case DPLANE_OP_ADDR_UNINSTALL:
|
||||
case DPLANE_OP_MAC_INSTALL:
|
||||
case DPLANE_OP_MAC_DELETE:
|
||||
case DPLANE_OP_NEIGH_INSTALL:
|
||||
case DPLANE_OP_NEIGH_UPDATE:
|
||||
case DPLANE_OP_NEIGH_DELETE:
|
||||
case DPLANE_OP_VTEP_ADD:
|
||||
case DPLANE_OP_VTEP_DELETE:
|
||||
case DPLANE_OP_SYS_ROUTE_ADD:
|
||||
case DPLANE_OP_SYS_ROUTE_DELETE:
|
||||
case DPLANE_OP_ROUTE_NOTIFY:
|
||||
case DPLANE_OP_LSP_NOTIFY:
|
||||
case DPLANE_OP_NONE:
|
||||
break;
|
||||
|
||||
default:
|
||||
zlog_debug("%s: unhandled data plane message (%d) %s",
|
||||
__func__, dplane_ctx_get_op(ctx),
|
||||
dplane_op2str(dplane_ctx_get_op(ctx)));
|
||||
break;
|
||||
}
|
||||
|
||||
/* Skip empty enqueues. */
|
||||
if (nl_buf_len == 0)
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* FPM header:
|
||||
* {
|
||||
* version: 1 byte (always 1),
|
||||
* type: 1 byte (1 for netlink, 2 protobuf),
|
||||
* len: 2 bytes (network order),
|
||||
* }
|
||||
*/
|
||||
stream_putc(fnc->obuf, 1);
|
||||
stream_putc(fnc->obuf, 1);
|
||||
assert(nl_buf_len < UINT16_MAX);
|
||||
stream_putw(fnc->obuf, nl_buf_len + 4);
|
||||
|
||||
/* Write current data. */
|
||||
stream_write(fnc->obuf, nl_buf, (size_t)nl_buf_len);
|
||||
|
||||
/* Tell the thread to start writing. */
|
||||
thread_add_write(fnc->fthread->master, fpm_write, fnc, fnc->socket,
|
||||
&fnc->t_write);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Data plane functions.
|
||||
*/
|
||||
static int fpm_nl_start(struct zebra_dplane_provider *prov)
|
||||
{
|
||||
struct fpm_nl_ctx *fnc;
|
||||
|
||||
fnc = dplane_provider_get_data(prov);
|
||||
fnc->fthread = frr_pthread_new(NULL, prov_name, prov_name);
|
||||
assert(frr_pthread_run(fnc->fthread, NULL) == 0);
|
||||
fnc->ibuf = stream_new(NL_PKT_BUF_SIZE);
|
||||
fnc->obuf = stream_new(NL_PKT_BUF_SIZE * 128);
|
||||
pthread_mutex_init(&fnc->obuf_mutex, NULL);
|
||||
fnc->socket = -1;
|
||||
|
||||
thread_add_timer(fnc->fthread->master, fpm_connect, fnc, 1,
|
||||
&fnc->t_connect);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fpm_nl_finish(struct zebra_dplane_provider *prov, bool early)
|
||||
{
|
||||
struct fpm_nl_ctx *fnc;
|
||||
|
||||
fnc = dplane_provider_get_data(prov);
|
||||
stream_free(fnc->ibuf);
|
||||
stream_free(fnc->obuf);
|
||||
close(fnc->socket);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fpm_nl_process(struct zebra_dplane_provider *prov)
|
||||
{
|
||||
struct zebra_dplane_ctx *ctx;
|
||||
struct fpm_nl_ctx *fnc;
|
||||
int counter, limit;
|
||||
|
||||
fnc = dplane_provider_get_data(prov);
|
||||
limit = dplane_provider_get_work_limit(prov);
|
||||
for (counter = 0; counter < limit; counter++) {
|
||||
ctx = dplane_provider_dequeue_in_ctx(prov);
|
||||
if (ctx == NULL)
|
||||
break;
|
||||
|
||||
/*
|
||||
* Skip all notifications if not connected, we'll walk the RIB
|
||||
* anyway.
|
||||
*/
|
||||
if (fnc->socket != -1 && fnc->connecting == false)
|
||||
fpm_nl_enqueue(fnc, ctx);
|
||||
|
||||
dplane_ctx_set_status(ctx, ZEBRA_DPLANE_REQUEST_SUCCESS);
|
||||
dplane_provider_enqueue_out_ctx(prov, ctx);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fpm_nl_new(struct thread_master *tm)
|
||||
{
|
||||
struct zebra_dplane_provider *prov = NULL;
|
||||
struct fpm_nl_ctx *fnc;
|
||||
int rv;
|
||||
|
||||
fnc = calloc(1, sizeof(*fnc));
|
||||
rv = dplane_provider_register(prov_name, DPLANE_PRIO_POSTPROCESS,
|
||||
DPLANE_PROV_FLAG_THREADED, fpm_nl_start,
|
||||
fpm_nl_process, fpm_nl_finish, fnc,
|
||||
&prov);
|
||||
|
||||
if (IS_ZEBRA_DEBUG_DPLANE)
|
||||
zlog_debug("%s register status: %d", prov_name, rv);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int fpm_nl_init(void)
|
||||
{
|
||||
hook_register(frr_late_init, fpm_nl_new);
|
||||
return 0;
|
||||
}
|
||||
|
||||
FRR_MODULE_SETUP(
|
||||
.name = "dplane_fpm_nl",
|
||||
.version = "0.0.1",
|
||||
.description = "Data plane plugin for FPM using netlink.",
|
||||
.init = fpm_nl_init,
|
||||
)
|
||||
@ -32,6 +32,7 @@ module_LTLIBRARIES += zebra/zebra_snmp.la
|
||||
endif
|
||||
if FPM
|
||||
module_LTLIBRARIES += zebra/zebra_fpm.la
|
||||
module_LTLIBRARIES += zebra/dplane_fpm_nl.la
|
||||
endif
|
||||
if LINUX
|
||||
module_LTLIBRARIES += zebra/zebra_cumulus_mlag.la
|
||||
@ -199,3 +200,7 @@ nodist_zebra_zebra_SOURCES = \
|
||||
|
||||
zebra_zebra_cumulus_mlag_la_SOURCES = zebra/zebra_mlag_private.c
|
||||
zebra_zebra_cumulus_mlag_la_LDFLAGS = -avoid-version -module -shared -export-dynamic
|
||||
|
||||
zebra_dplane_fpm_nl_la_SOURCES = zebra/dplane_fpm_nl.c
|
||||
zebra_dplane_fpm_nl_la_LDFLAGS = -avoid-version -module -shared -export-dynamic
|
||||
zebra_dplane_fpm_nl_la_LIBADD =
|
||||
|
||||
Loading…
Reference in New Issue
Block a user