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dplane_fpm_nl.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Zebra dataplane plugin for Forwarding Plane Manager (FPM) using netlink.
*
* Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF")
* Rafael Zalamena
*/
#ifdef HAVE_CONFIG_H
#include "config.h" /* Include this explicitly */
#endif
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <errno.h>
#include <string.h>
#include "lib/zebra.h"
#include <linux/rtnetlink.h>
#include "lib/json.h"
#include "lib/libfrr.h"
#include "lib/frratomic.h"
#include "lib/command.h"
#include "lib/memory.h"
#include "lib/network.h"
#include "lib/ns.h"
#include "lib/frr_pthread.h"
#include "lib/termtable.h"
#include "zebra/debug.h"
#include "zebra/interface.h"
#include "zebra/zebra_dplane.h"
#include "zebra/zebra_mpls.h"
#include "zebra/zebra_router.h"
#include "zebra/zebra_vxlan_private.h"
#include "zebra/zebra_evpn.h"
#include "zebra/zebra_evpn_mac.h"
#include "zebra/kernel_netlink.h"
#include "zebra/rt_netlink.h"
#include "fpm/fpm.h"
#include "zebra/dplane_fpm_nl_clippy.c"
#define SOUTHBOUND_DEFAULT_ADDR INADDR_LOOPBACK
/*
* Time in seconds that if the other end is not responding
* something terrible has gone wrong. Let's fix that.
*/
#define DPLANE_FPM_NL_WEDGIE_TIME 15
/**
* FPM header:
* {
* version: 1 byte (always 1),
* type: 1 byte (1 for netlink, 2 protobuf),
* len: 2 bytes (network order),
* }
*
* This header is used with any format to tell the users how many bytes to
* expect.
*/
#define FPM_HEADER_SIZE 4
static const char *prov_name = "dplane_fpm_nl";
struct fpm_nl_ctx {
/* data plane connection. */
int socket;
bool disabled;
bool connecting;
bool use_nhg;
bool use_route_replace;
struct sockaddr_storage addr;
/* data plane buffers. */
struct stream *ibuf;
struct stream *obuf;
pthread_mutex_t obuf_mutex;
/*
* data plane context queue:
* When a FPM server connection becomes a bottleneck, we must keep the
* data plane contexts until we get a chance to process them.
*/
struct dplane_ctx_list_head ctxqueue;
pthread_mutex_t ctxqueue_mutex;
/* data plane events. */
struct zebra_dplane_provider *prov;
struct frr_pthread *fthread;
struct event *t_connect;
struct event *t_read;
struct event *t_write;
struct event *t_event;
struct event *t_nhg;
struct event *t_dequeue;
struct event *t_wedged;
/* zebra events. */
struct event *t_lspreset;
struct event *t_lspwalk;
struct event *t_nhgreset;
struct event *t_nhgwalk;
struct event *t_ribreset;
struct event *t_ribwalk;
struct event *t_rmacreset;
struct event *t_rmacwalk;
/* Statistic counters. */
struct {
/* Amount of bytes read into ibuf. */
_Atomic uint32_t bytes_read;
/* Amount of bytes written from obuf. */
_Atomic uint32_t bytes_sent;
/* Output buffer current usage. */
_Atomic uint32_t obuf_bytes;
/* Output buffer peak usage. */
_Atomic uint32_t obuf_peak;
/* Amount of connection closes. */
_Atomic uint32_t connection_closes;
/* Amount of connection errors. */
_Atomic uint32_t connection_errors;
/* Amount of user configurations: FNE_RECONNECT. */
_Atomic uint32_t user_configures;
/* Amount of user disable requests: FNE_DISABLE. */
_Atomic uint32_t user_disables;
/* Amount of data plane context processed. */
_Atomic uint32_t dplane_contexts;
/* Peak amount of data plane contexts enqueued. */
_Atomic uint32_t ctxqueue_len_peak;
/* Amount of buffer full events. */
_Atomic uint32_t buffer_full;
} counters;
} *gfnc;
enum fpm_nl_events {
/* Ask for FPM to reconnect the external server. */
FNE_RECONNECT,
/* Disable FPM. */
FNE_DISABLE,
/* Reset counters. */
FNE_RESET_COUNTERS,
/* Toggle next hop group feature. */
FNE_TOGGLE_NHG,
/* Reconnect request by our own code to avoid races. */
FNE_INTERNAL_RECONNECT,
/* LSP walk finished. */
FNE_LSP_FINISHED,
/* Next hop groups walk finished. */
FNE_NHG_FINISHED,
/* RIB walk finished. */
FNE_RIB_FINISHED,
/* RMAC walk finished. */
FNE_RMAC_FINISHED,
};
#define FPM_RECONNECT(fnc) \
event_add_event((fnc)->fthread->master, fpm_process_event, (fnc), \
FNE_INTERNAL_RECONNECT, &(fnc)->t_event)
#define WALK_FINISH(fnc, ev) \
event_add_event((fnc)->fthread->master, fpm_process_event, (fnc), \
(ev), NULL)
/*
* Prototypes.
*/
static void fpm_process_event(struct event *t);
static int fpm_nl_enqueue(struct fpm_nl_ctx *fnc, struct zebra_dplane_ctx *ctx);
static void fpm_lsp_send(struct event *t);
static void fpm_lsp_reset(struct event *t);
static void fpm_nhg_send(struct event *t);
static void fpm_nhg_reset(struct event *t);
static void fpm_rib_send(struct event *t);
static void fpm_rib_reset(struct event *t);
static void fpm_rmac_send(struct event *t);
static void fpm_rmac_reset(struct event *t);
/*
* CLI.
*/
#define FPM_STR "Forwarding Plane Manager configuration\n"
DEFUN(fpm_set_address, fpm_set_address_cmd,
"fpm address <A.B.C.D|X:X::X:X> [port (1-65535)]",
FPM_STR
"FPM remote listening server address\n"
"Remote IPv4 FPM server\n"
"Remote IPv6 FPM server\n"
"FPM remote listening server port\n"
"Remote FPM server port\n")
{
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
uint16_t port = 0;
uint8_t naddr[INET6_BUFSIZ];
if (argc == 5)
port = strtol(argv[4]->arg, NULL, 10);
/* Handle IPv4 addresses. */
if (inet_pton(AF_INET, argv[2]->arg, naddr) == 1) {
sin = (struct sockaddr_in *)&gfnc->addr;
memset(sin, 0, sizeof(*sin));
sin->sin_family = AF_INET;
sin->sin_port =
port ? htons(port) : htons(FPM_DEFAULT_PORT);
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
sin->sin_len = sizeof(*sin);
#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
memcpy(&sin->sin_addr, naddr, sizeof(sin->sin_addr));
goto ask_reconnect;
}
/* Handle IPv6 addresses. */
if (inet_pton(AF_INET6, argv[2]->arg, naddr) != 1) {
vty_out(vty, "%% Invalid address: %s\n", argv[2]->arg);
return CMD_WARNING;
}
sin6 = (struct sockaddr_in6 *)&gfnc->addr;
memset(sin6, 0, sizeof(*sin6));
sin6->sin6_family = AF_INET6;
sin6->sin6_port = port ? htons(port) : htons(FPM_DEFAULT_PORT);
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
sin6->sin6_len = sizeof(*sin6);
#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
memcpy(&sin6->sin6_addr, naddr, sizeof(sin6->sin6_addr));
ask_reconnect:
event_add_event(gfnc->fthread->master, fpm_process_event, gfnc,
FNE_RECONNECT, &gfnc->t_event);
return CMD_SUCCESS;
}
DEFUN(no_fpm_set_address, no_fpm_set_address_cmd,
"no fpm address [<A.B.C.D|X:X::X:X> [port <1-65535>]]",
NO_STR
FPM_STR
"FPM remote listening server address\n"
"Remote IPv4 FPM server\n"
"Remote IPv6 FPM server\n"
"FPM remote listening server port\n"
"Remote FPM server port\n")
{
event_add_event(gfnc->fthread->master, fpm_process_event, gfnc,
FNE_DISABLE, &gfnc->t_event);
return CMD_SUCCESS;
}
DEFUN(fpm_use_nhg, fpm_use_nhg_cmd,
"fpm use-next-hop-groups",
FPM_STR
"Use netlink next hop groups feature.\n")
{
/* Already enabled. */
if (gfnc->use_nhg)
return CMD_SUCCESS;
event_add_event(gfnc->fthread->master, fpm_process_event, gfnc,
FNE_TOGGLE_NHG, &gfnc->t_nhg);
return CMD_SUCCESS;
}
DEFUN(no_fpm_use_nhg, no_fpm_use_nhg_cmd,
"no fpm use-next-hop-groups",
NO_STR
FPM_STR
"Use netlink next hop groups feature.\n")
{
/* Already disabled. */
if (!gfnc->use_nhg)
return CMD_SUCCESS;
event_add_event(gfnc->fthread->master, fpm_process_event, gfnc,
FNE_TOGGLE_NHG, &gfnc->t_nhg);
return CMD_SUCCESS;
}
DEFUN(fpm_use_route_replace, fpm_use_route_replace_cmd,
"fpm use-route-replace",
FPM_STR
"Use netlink route replace semantics\n")
{
gfnc->use_route_replace = true;
return CMD_SUCCESS;
}
DEFUN(no_fpm_use_route_replace, no_fpm_use_route_replace_cmd,
"no fpm use-route-replace",
NO_STR
FPM_STR
"Use netlink route replace semantics\n")
{
gfnc->use_route_replace = false;
return CMD_SUCCESS;
}
DEFUN(fpm_reset_counters, fpm_reset_counters_cmd,
"clear fpm counters",
CLEAR_STR
FPM_STR
"FPM statistic counters\n")
{
event_add_event(gfnc->fthread->master, fpm_process_event, gfnc,
FNE_RESET_COUNTERS, &gfnc->t_event);
return CMD_SUCCESS;
}
DEFPY(fpm_show_status,
fpm_show_status_cmd,
"show fpm status [json]$json",
SHOW_STR FPM_STR "FPM status\n" JSON_STR)
{
struct json_object *j;
bool connected;
uint16_t port;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
char buf[BUFSIZ];
connected = gfnc->socket > 0 ? true : false;
switch (gfnc->addr.ss_family) {
case AF_INET:
sin = (struct sockaddr_in *)&gfnc->addr;
snprintfrr(buf, sizeof(buf), "%pI4", &sin->sin_addr);
port = ntohs(sin->sin_port);
break;
case AF_INET6:
sin6 = (struct sockaddr_in6 *)&gfnc->addr;
snprintfrr(buf, sizeof(buf), "%pI6", &sin6->sin6_addr);
port = ntohs(sin6->sin6_port);
break;
default:
strlcpy(buf, "Unknown", sizeof(buf));
port = FPM_DEFAULT_PORT;
break;
}
if (json) {
j = json_object_new_object();
json_object_boolean_add(j, "connected", connected);
json_object_boolean_add(j, "useNHG", gfnc->use_nhg);
json_object_boolean_add(j, "useRouteReplace",
gfnc->use_route_replace);
json_object_boolean_add(j, "disabled", gfnc->disabled);
json_object_string_add(j, "address", buf);
json_object_int_add(j, "port", port);
vty_json(vty, j);
} else {
struct ttable *table = ttable_new(&ttable_styles[TTSTYLE_BLANK]);
char *out;
ttable_rowseps(table, 0, BOTTOM, true, '-');
ttable_add_row(table, "Address to connect to|%s", buf);
ttable_add_row(table, "Port|%u", port);
ttable_add_row(table, "Connected|%s", connected ? "Yes" : "No");
ttable_add_row(table, "Use Nexthop Groups|%s",
gfnc->use_nhg ? "Yes" : "No");
ttable_add_row(table, "Use Route Replace Semantics|%s",
gfnc->use_route_replace ? "Yes" : "No");
ttable_add_row(table, "Disabled|%s",
gfnc->disabled ? "Yes" : "No");
out = ttable_dump(table, "\n");
vty_out(vty, "%s\n", out);
XFREE(MTYPE_TMP_TTABLE, out);
ttable_del(table);
}
return CMD_SUCCESS;
}
DEFUN(fpm_show_counters, fpm_show_counters_cmd,
"show fpm counters",
SHOW_STR
FPM_STR
"FPM statistic counters\n")
{
uint32_t curr_queue_len;
frr_with_mutex (&gfnc->ctxqueue_mutex) {
curr_queue_len = dplane_ctx_queue_count(&gfnc->ctxqueue);
}
vty_out(vty, "%30s\n%30s\n", "FPM counters", "============");
#define SHOW_COUNTER(label, counter) \
vty_out(vty, "%28s: %u\n", (label), (counter))
SHOW_COUNTER("Input bytes", gfnc->counters.bytes_read);
SHOW_COUNTER("Output bytes", gfnc->counters.bytes_sent);
SHOW_COUNTER("Output buffer current size", gfnc->counters.obuf_bytes);
SHOW_COUNTER("Output buffer peak size", gfnc->counters.obuf_peak);
SHOW_COUNTER("Connection closes", gfnc->counters.connection_closes);
SHOW_COUNTER("Connection errors", gfnc->counters.connection_errors);
SHOW_COUNTER("Data plane items processed",
gfnc->counters.dplane_contexts);
SHOW_COUNTER("Data plane items enqueued", curr_queue_len);
SHOW_COUNTER("Data plane items queue peak",
gfnc->counters.ctxqueue_len_peak);
SHOW_COUNTER("Buffer full hits", gfnc->counters.buffer_full);
SHOW_COUNTER("User FPM configurations", gfnc->counters.user_configures);
SHOW_COUNTER("User FPM disable requests", gfnc->counters.user_disables);
#undef SHOW_COUNTER
return CMD_SUCCESS;
}
DEFUN(fpm_show_counters_json, fpm_show_counters_json_cmd,
"show fpm counters json",
SHOW_STR
FPM_STR
"FPM statistic counters\n"
JSON_STR)
{
uint32_t curr_queue_len;
frr_with_mutex (&gfnc->ctxqueue_mutex) {
curr_queue_len = dplane_ctx_queue_count(&gfnc->ctxqueue);
}
struct json_object *jo;
jo = json_object_new_object();
json_object_int_add(jo, "bytes-read", gfnc->counters.bytes_read);
json_object_int_add(jo, "bytes-sent", gfnc->counters.bytes_sent);
json_object_int_add(jo, "obuf-bytes", gfnc->counters.obuf_bytes);
json_object_int_add(jo, "obuf-bytes-peak", gfnc->counters.obuf_peak);
json_object_int_add(jo, "connection-closes",
gfnc->counters.connection_closes);
json_object_int_add(jo, "connection-errors",
gfnc->counters.connection_errors);
json_object_int_add(jo, "data-plane-contexts",
gfnc->counters.dplane_contexts);
json_object_int_add(jo, "data-plane-contexts-queue", curr_queue_len);
json_object_int_add(jo, "data-plane-contexts-queue-peak",
gfnc->counters.ctxqueue_len_peak);
json_object_int_add(jo, "buffer-full-hits", gfnc->counters.buffer_full);
json_object_int_add(jo, "user-configures",
gfnc->counters.user_configures);
json_object_int_add(jo, "user-disables", gfnc->counters.user_disables);
vty_json(vty, jo);
return CMD_SUCCESS;
}
static int fpm_write_config(struct vty *vty)
{
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
int written = 0;
if (gfnc->disabled)
return written;
switch (gfnc->addr.ss_family) {
case AF_INET:
written = 1;
sin = (struct sockaddr_in *)&gfnc->addr;
vty_out(vty, "fpm address %pI4", &sin->sin_addr);
if (sin->sin_port != htons(FPM_DEFAULT_PORT))
vty_out(vty, " port %d", ntohs(sin->sin_port));
vty_out(vty, "\n");
break;
case AF_INET6:
written = 1;
sin6 = (struct sockaddr_in6 *)&gfnc->addr;
vty_out(vty, "fpm address %pI6", &sin6->sin6_addr);
if (sin6->sin6_port != htons(FPM_DEFAULT_PORT))
vty_out(vty, " port %d", ntohs(sin6->sin6_port));
vty_out(vty, "\n");
break;
default:
break;
}
if (!gfnc->use_nhg) {
vty_out(vty, "no fpm use-next-hop-groups\n");
written = 1;
}
if (!gfnc->use_route_replace) {
vty_out(vty, "no fpm use-route-replace\n");
written = 1;
}
return written;
}
static struct cmd_node fpm_node = {
.name = "fpm",
.node = FPM_NODE,
.prompt = "",
.config_write = fpm_write_config,
};
/*
* FPM functions.
*/
static void fpm_connect(struct event *t);
static void fpm_reconnect(struct fpm_nl_ctx *fnc)
{
/* Cancel all zebra threads first. */
event_cancel_async(zrouter.master, &fnc->t_lspreset, NULL);
event_cancel_async(zrouter.master, &fnc->t_lspwalk, NULL);
event_cancel_async(zrouter.master, &fnc->t_nhgreset, NULL);
event_cancel_async(zrouter.master, &fnc->t_nhgwalk, NULL);
event_cancel_async(zrouter.master, &fnc->t_ribreset, NULL);
event_cancel_async(zrouter.master, &fnc->t_ribwalk, NULL);
event_cancel_async(zrouter.master, &fnc->t_rmacreset, NULL);
event_cancel_async(zrouter.master, &fnc->t_rmacwalk, NULL);
/*
* Grab the lock to empty the streams (data plane might try to
* enqueue updates while we are closing).
*/
frr_mutex_lock_autounlock(&fnc->obuf_mutex);
/* Avoid calling close on `-1`. */
if (fnc->socket != -1) {
close(fnc->socket);
fnc->socket = -1;
}
stream_reset(fnc->ibuf);
stream_reset(fnc->obuf);
EVENT_OFF(fnc->t_read);
EVENT_OFF(fnc->t_write);
/* FPM is disabled, don't attempt to connect. */
if (fnc->disabled)
return;
event_add_timer(fnc->fthread->master, fpm_connect, fnc, 3,
&fnc->t_connect);
}
static void fpm_read(struct event *t)
{
struct fpm_nl_ctx *fnc = EVENT_ARG(t);
fpm_msg_hdr_t fpm;
ssize_t rv;
char buf[65535];
struct nlmsghdr *hdr;
struct zebra_dplane_ctx *ctx;
size_t available_bytes;
size_t hdr_available_bytes;
/* Let's ignore the input at the moment. */
rv = stream_read_try(fnc->ibuf, fnc->socket,
STREAM_WRITEABLE(fnc->ibuf));
if (rv == 0) {
atomic_fetch_add_explicit(&fnc->counters.connection_closes, 1,
memory_order_relaxed);
if (IS_ZEBRA_DEBUG_FPM)
zlog_debug("%s: connection closed", __func__);
FPM_RECONNECT(fnc);
return;
}
if (rv == -1) {
atomic_fetch_add_explicit(&fnc->counters.connection_errors, 1,
memory_order_relaxed);
zlog_warn("%s: connection failure: %s", __func__,
strerror(errno));
FPM_RECONNECT(fnc);
return;
}
/* Schedule the next read */
event_add_read(fnc->fthread->master, fpm_read, fnc, fnc->socket,
&fnc->t_read);
/* We've got an interruption. */
if (rv == -2)
return;
/* Account all bytes read. */
atomic_fetch_add_explicit(&fnc->counters.bytes_read, rv,
memory_order_relaxed);
available_bytes = STREAM_READABLE(fnc->ibuf);
while (available_bytes) {
if (available_bytes < (ssize_t)FPM_MSG_HDR_LEN) {
stream_pulldown(fnc->ibuf);
return;
}
fpm.version = stream_getc(fnc->ibuf);
fpm.msg_type = stream_getc(fnc->ibuf);
fpm.msg_len = stream_getw(fnc->ibuf);
if (fpm.version != FPM_PROTO_VERSION &&
fpm.msg_type != FPM_MSG_TYPE_NETLINK) {
stream_reset(fnc->ibuf);
zlog_warn(
"%s: Received version/msg_type %u/%u, expected 1/1",
__func__, fpm.version, fpm.msg_type);
FPM_RECONNECT(fnc);
return;
}
/*
* If the passed in length doesn't even fill in the header
* something is wrong and reset.
*/
if (fpm.msg_len < FPM_MSG_HDR_LEN) {
zlog_warn(
"%s: Received message length: %u that does not even fill the FPM header",
__func__, fpm.msg_len);
FPM_RECONNECT(fnc);
return;
}
/*
* If we have not received the whole payload, reset the stream
* back to the beginning of the header and move it to the
* top.
*/
if (fpm.msg_len > available_bytes) {
stream_rewind_getp(fnc->ibuf, FPM_MSG_HDR_LEN);
stream_pulldown(fnc->ibuf);
return;
}
available_bytes -= FPM_MSG_HDR_LEN;
/*
* Place the data from the stream into a buffer
*/
hdr = (struct nlmsghdr *)buf;
stream_get(buf, fnc->ibuf, fpm.msg_len - FPM_MSG_HDR_LEN);
hdr_available_bytes = fpm.msg_len - FPM_MSG_HDR_LEN;
available_bytes -= hdr_available_bytes;
if (hdr->nlmsg_len > fpm.msg_len) {
zlog_warn(
"%s: Received a inner header length of %u that is greater than the fpm total length of %u",
__func__, hdr->nlmsg_len, fpm.msg_len);
FPM_RECONNECT(fnc);
}
/* Not enough bytes available. */
if (hdr->nlmsg_len > hdr_available_bytes) {
zlog_warn(
"%s: [seq=%u] invalid message length %u (> %zu)",
__func__, hdr->nlmsg_seq, hdr->nlmsg_len,
available_bytes);
continue;
}
if (!(hdr->nlmsg_flags & NLM_F_REQUEST)) {
if (IS_ZEBRA_DEBUG_FPM)
zlog_debug(
"%s: [seq=%u] not a request, skipping",
__func__, hdr->nlmsg_seq);
/*
* This request is a bust, go to the next one
*/
continue;
}
switch (hdr->nlmsg_type) {
case RTM_NEWROUTE:
/* Sanity check: need at least route msg header size. */
if (hdr->nlmsg_len < sizeof(struct rtmsg)) {
zlog_warn("%s: [seq=%u] invalid message length %u (< %zu)",
__func__, hdr->nlmsg_seq,
hdr->nlmsg_len, sizeof(struct rtmsg));
break;
}
ctx = dplane_ctx_alloc();
dplane_ctx_route_init(ctx, DPLANE_OP_ROUTE_NOTIFY, NULL,
NULL);
if (netlink_route_change_read_unicast_internal(
hdr, 0, false, ctx) != 1) {
dplane_ctx_fini(&ctx);
stream_pulldown(fnc->ibuf);
/*
* Let's continue to read other messages
* Even if we ignore this one.
*/
}
break;
default:
if (IS_ZEBRA_DEBUG_FPM)
zlog_debug(
"%s: Received message type %u which is not currently handled",
__func__, hdr->nlmsg_type);
break;
}
}
stream_reset(fnc->ibuf);
}
static void fpm_write(struct event *t)
{
struct fpm_nl_ctx *fnc = EVENT_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_warn("%s: connection failed: %s", __func__,
strerror(status));
else
zlog_warn("%s: SO_ERROR failed: %s", __func__,
strerror(status));
atomic_fetch_add_explicit(
&fnc->counters.connection_errors, 1,
memory_order_relaxed);
FPM_RECONNECT(fnc);
return;
}
fnc->connecting = false;
/*
* Starting with LSPs walk all FPM objects, marking them
* as unsent and then replaying them.
*/
event_add_timer(zrouter.master, fpm_lsp_reset, fnc, 0,
&fnc->t_lspreset);
/* Permit receiving messages now. */
event_add_read(fnc->fthread->master, fpm_read, fnc, fnc->socket,
&fnc->t_read);
}
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) {
atomic_fetch_add_explicit(
&fnc->counters.connection_closes, 1,
memory_order_relaxed);
if (IS_ZEBRA_DEBUG_FPM)
zlog_debug("%s: connection closed", __func__);
break;
}
if (bwritten == -1) {
/* Attempt to continue if blocked by a signal. */
if (errno == EINTR)
continue;
/* Receiver is probably slow, lets give it some time. */
if (errno == EAGAIN || errno == EWOULDBLOCK)
break;
atomic_fetch_add_explicit(
&fnc->counters.connection_errors, 1,
memory_order_relaxed);
zlog_warn("%s: connection failure: %s", __func__,
strerror(errno));
FPM_RECONNECT(fnc);
return;
}
/* Account all bytes sent. */
atomic_fetch_add_explicit(&fnc->counters.bytes_sent, bwritten,
memory_order_relaxed);
/* Account number of bytes free. */
atomic_fetch_sub_explicit(&fnc->counters.obuf_bytes, bwritten,
memory_order_relaxed);
stream_forward_getp(fnc->obuf, (size_t)bwritten);
}
/* Stream is not empty yet, we must schedule more writes. */
if (STREAM_READABLE(fnc->obuf)) {
stream_pulldown(fnc->obuf);
event_add_write(fnc->fthread->master, fpm_write, fnc,
fnc->socket, &fnc->t_write);
return;
}
}
static void fpm_connect(struct event *t)
{
struct fpm_nl_ctx *fnc = EVENT_ARG(t);
struct sockaddr_in *sin = (struct sockaddr_in *)&fnc->addr;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&fnc->addr;
socklen_t slen;
int rv, sock;
char addrstr[INET6_ADDRSTRLEN];
sock = socket(fnc->addr.ss_family, SOCK_STREAM, 0);
if (sock == -1) {
zlog_err("%s: fpm socket failed: %s", __func__,
strerror(errno));
event_add_timer(fnc->fthread->master, fpm_connect, fnc, 3,
&fnc->t_connect);
return;
}
set_nonblocking(sock);
if (fnc->addr.ss_family == AF_INET) {
inet_ntop(AF_INET, &sin->sin_addr, addrstr, sizeof(addrstr));
slen = sizeof(*sin);
} else {
inet_ntop(AF_INET6, &sin6->sin6_addr, addrstr, sizeof(addrstr));
slen = sizeof(*sin6);
}
if (IS_ZEBRA_DEBUG_FPM)
zlog_debug("%s: attempting to connect to %s:%d", __func__,
addrstr, ntohs(sin->sin_port));
rv = connect(sock, (struct sockaddr *)&fnc->addr, slen);
if (rv == -1 && errno != EINPROGRESS) {
atomic_fetch_add_explicit(&fnc->counters.connection_errors, 1,
memory_order_relaxed);
close(sock);
zlog_warn("%s: fpm connection failed: %s", __func__,
strerror(errno));
event_add_timer(fnc->fthread->master, fpm_connect, fnc, 3,
&fnc->t_connect);
return;
}
fnc->connecting = (errno == EINPROGRESS);
fnc->socket = sock;
if (!fnc->connecting)
event_add_read(fnc->fthread->master, fpm_read, fnc, sock,
&fnc->t_read);
event_add_write(fnc->fthread->master, fpm_write, fnc, sock,
&fnc->t_write);
/*
* Starting with LSPs walk all FPM objects, marking them
* as unsent and then replaying them.
*
* If we are not connected, then delay the objects reset/send.
*/
if (!fnc->connecting)
event_add_timer(zrouter.master, fpm_lsp_reset, fnc, 0,
&fnc->t_lspreset);
}
/**
* 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;
uint64_t obytes, obytes_peak;
enum dplane_op_e op = dplane_ctx_get_op(ctx);
/*
* If we were configured to not use next hop groups, then quit as soon
* as possible.
*/
if ((!fnc->use_nhg)
&& (op == DPLANE_OP_NH_DELETE || op == DPLANE_OP_NH_INSTALL
|| op == DPLANE_OP_NH_UPDATE))
return 0;
nl_buf_len = 0;
frr_mutex_lock_autounlock(&fnc->obuf_mutex);
/*
* If route replace is enabled then directly encode the install which
* is going to use `NLM_F_REPLACE` (instead of delete/add operations).
*/
if (fnc->use_route_replace && op == DPLANE_OP_ROUTE_UPDATE)
op = DPLANE_OP_ROUTE_INSTALL;
switch (op) {
case DPLANE_OP_ROUTE_UPDATE:
case DPLANE_OP_ROUTE_DELETE:
rv = netlink_route_multipath_msg_encode(RTM_DELROUTE, ctx,
nl_buf, sizeof(nl_buf),
true, fnc->use_nhg,
false);
if (rv <= 0) {
zlog_err(
"%s: netlink_route_multipath_msg_encode failed",
__func__);
return 0;
}
nl_buf_len = (size_t)rv;
/* UPDATE operations need a INSTALL, otherwise just quit. */
if (op == DPLANE_OP_ROUTE_DELETE)
break;
fallthrough;
case DPLANE_OP_ROUTE_INSTALL:
rv = netlink_route_multipath_msg_encode(RTM_NEWROUTE, ctx,
&nl_buf[nl_buf_len],
sizeof(nl_buf) -
nl_buf_len,
true, fnc->use_nhg,
fnc->use_route_replace);
if (rv <= 0) {
zlog_err(
"%s: netlink_route_multipath_msg_encode failed",
__func__);
return 0;
}
nl_buf_len += (size_t)rv;
break;
case DPLANE_OP_MAC_INSTALL:
case DPLANE_OP_MAC_DELETE:
rv = netlink_macfdb_update_ctx(ctx, nl_buf, sizeof(nl_buf));
if (rv <= 0) {
zlog_err("%s: netlink_macfdb_update_ctx failed",
__func__);
return 0;
}
nl_buf_len = (size_t)rv;
break;
case DPLANE_OP_NH_DELETE:
rv = netlink_nexthop_msg_encode(RTM_DELNEXTHOP, ctx, nl_buf,
sizeof(nl_buf), true);
if (rv <= 0) {
zlog_err("%s: netlink_nexthop_msg_encode failed",
__func__);
return 0;
}
nl_buf_len = (size_t)rv;
break;
case DPLANE_OP_NH_INSTALL:
case DPLANE_OP_NH_UPDATE:
rv = netlink_nexthop_msg_encode(RTM_NEWNEXTHOP, ctx, nl_buf,
sizeof(nl_buf), true);
if (rv <= 0) {
zlog_err("%s: netlink_nexthop_msg_encode failed",
__func__);
return 0;
}
nl_buf_len = (size_t)rv;
break;