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dplane.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* BFD data plane implementation (distributed BFD).
*
* Copyright (C) 2020 Network Device Education Foundation, Inc. ("NetDEF")
* Rafael Zalamena
*/
#include <zebra.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <sys/socket.h>
#include <sys/un.h>
#ifdef __FreeBSD__
#include <sys/endian.h>
#else
#include <endian.h>
#endif /* __FreeBSD__ */
#include <errno.h>
#include <time.h>
#include "lib/hook.h"
#include "lib/network.h"
#include "lib/printfrr.h"
#include "lib/stream.h"
#include "lib/frrevent.h"
#include "bfd.h"
#include "bfddp_packet.h"
#include "lib/openbsd-queue.h"
DEFINE_MTYPE_STATIC(BFDD, BFDD_DPLANE_CTX,
"Data plane client allocated memory");
/** Data plane client socket buffer size. */
#define BFD_DPLANE_CLIENT_BUF_SIZE 8192
struct bfd_dplane_ctx {
/** Client file descriptor. */
int sock;
/** Is this a connected or accepted? */
bool client;
/** Is the socket still connecting? */
bool connecting;
/** Client/server address. */
union {
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct sockaddr_un sun;
} addr;
/** Address length. */
socklen_t addrlen;
/** Data plane current last used ID. */
uint16_t last_id;
/** Input buffer data. */
struct stream *inbuf;
/** Output buffer data. */
struct stream *outbuf;
/** Input event data. */
struct event *inbufev;
/** Output event data. */
struct event *outbufev;
/** Connection event. */
struct event *connectev;
/** Amount of bytes read. */
uint64_t in_bytes;
/** Amount of bytes read peak. */
uint64_t in_bytes_peak;
/** Amount of bytes written. */
uint64_t out_bytes;
/** Amount of bytes written peak. */
uint64_t out_bytes_peak;
/** Amount of output buffer full events (`bfd_dplane_enqueue` failed).
*/
uint64_t out_fullev;
/** Amount of messages read (full messages). */
uint64_t in_msgs;
/** Amount of messages enqueued (maybe written). */
uint64_t out_msgs;
TAILQ_ENTRY(bfd_dplane_ctx) entry;
};
/**
* Callback type for `bfd_dplane_expect`. \see bfd_dplane_expect.
*/
typedef void (*bfd_dplane_expect_cb)(struct bfddp_message *msg, void *arg);
static void bfd_dplane_client_connect(struct event *t);
static bool bfd_dplane_client_connecting(struct bfd_dplane_ctx *bdc);
static void bfd_dplane_ctx_free(struct bfd_dplane_ctx *bdc);
static int _bfd_dplane_add_session(struct bfd_dplane_ctx *bdc,
struct bfd_session *bs);
/*
* BFD data plane helper functions.
*/
static const char *bfd_dplane_messagetype2str(enum bfddp_message_type bmt)
{
switch (bmt) {
case ECHO_REQUEST:
return "ECHO_REQUEST";
case ECHO_REPLY:
return "ECHO_REPLY";
case DP_ADD_SESSION:
return "DP_ADD_SESSION";
case DP_DELETE_SESSION:
return "DP_DELETE_SESSION";
case BFD_STATE_CHANGE:
return "BFD_STATE_CHANGE";
case DP_REQUEST_SESSION_COUNTERS:
return "DP_REQUEST_SESSION_COUNTERS";
case BFD_SESSION_COUNTERS:
return "BFD_SESSION_COUNTERS";
default:
return "UNKNOWN";
}
}
static void bfd_dplane_debug_message(const struct bfddp_message *msg)
{
enum bfddp_message_type bmt;
char buf[256], addrs[256];
uint32_t flags;
int rv;
if (!bglobal.debug_dplane)
return;
bmt = ntohs(msg->header.type);
zlog_debug("dplane-packet: [version=%d length=%d type=%s (%d)]",
msg->header.version, ntohs(msg->header.length),
bfd_dplane_messagetype2str(bmt), bmt);
switch (bmt) {
case ECHO_REPLY:
case ECHO_REQUEST:
zlog_debug(" [dp_time=%" PRIu64 " bfdd_time=%" PRIu64 "]",
be64toh(msg->data.echo.dp_time),
be64toh(msg->data.echo.bfdd_time));
break;
case DP_ADD_SESSION:
case DP_DELETE_SESSION:
flags = ntohl(msg->data.session.flags);
if (flags & SESSION_IPV6)
snprintfrr(addrs, sizeof(addrs), "src=%pI6 dst=%pI6",
&msg->data.session.src,
&msg->data.session.dst);
else
snprintfrr(addrs, sizeof(addrs), "src=%pI4 dst=%pI4",
(struct in_addr *)&msg->data.session.src,
(struct in_addr *)&msg->data.session.dst);
buf[0] = 0;
if (flags & SESSION_CBIT)
strlcat(buf, "cpi ", sizeof(buf));
if (flags & SESSION_ECHO)
strlcat(buf, "echo ", sizeof(buf));
if (flags & SESSION_IPV6)
strlcat(buf, "ipv6 ", sizeof(buf));
if (flags & SESSION_DEMAND)
strlcat(buf, "demand ", sizeof(buf));
if (flags & SESSION_PASSIVE)
strlcat(buf, "passive ", sizeof(buf));
if (flags & SESSION_MULTIHOP)
strlcat(buf, "multihop ", sizeof(buf));
if (flags & SESSION_SHUTDOWN)
strlcat(buf, "shutdown ", sizeof(buf));
/* Remove the last space to make things prettier. */
rv = (int)strlen(buf);
if (rv > 0)
buf[rv - 1] = 0;
zlog_debug(
" [flags=0x%08x{%s} %s ttl=%d detect_mult=%d "
"ifindex=%d ifname=%s]",
flags, buf, addrs, msg->data.session.ttl,
msg->data.session.detect_mult,
ntohl(msg->data.session.ifindex),
msg->data.session.ifname);
break;
case BFD_STATE_CHANGE:
buf[0] = 0;
flags = ntohl(msg->data.state.remote_flags);
if (flags & RBIT_CPI)
strlcat(buf, "cbit ", sizeof(buf));
if (flags & RBIT_DEMAND)
strlcat(buf, "demand ", sizeof(buf));
if (flags & RBIT_MP)
strlcat(buf, "mp ", sizeof(buf));
/* Remove the last space to make things prettier. */
rv = (int)strlen(buf);
if (rv > 0)
buf[rv - 1] = 0;
zlog_debug(
" [lid=%u rid=%u flags=0x%02x{%s} state=%s "
"diagnostics=%s mult=%d tx=%u rx=%u erx=%u]",
ntohl(msg->data.state.lid), ntohl(msg->data.state.rid),
flags, buf, state_list[msg->data.state.state].str,
diag2str(msg->data.state.diagnostics),
msg->data.state.detection_multiplier,
ntohl(msg->data.state.desired_tx),
ntohl(msg->data.state.required_rx),
ntohl(msg->data.state.required_echo_rx));
break;
case DP_REQUEST_SESSION_COUNTERS:
zlog_debug(" [lid=%u]", ntohl(msg->data.counters_req.lid));
break;
case BFD_SESSION_COUNTERS:
zlog_debug(
" [lid=%u "
"control{in %" PRIu64 " bytes (%" PRIu64
" packets), "
"out %" PRIu64 " bytes (%" PRIu64
" packets)} "
"echo{in %" PRIu64 " bytes (%" PRIu64
" packets), "
"out %" PRIu64 " bytes (%" PRIu64 " packets)}]",
ntohl(msg->data.session_counters.lid),
be64toh(msg->data.session_counters.control_input_bytes),
be64toh(msg->data.session_counters
.control_input_packets),
be64toh(msg->data.session_counters
.control_output_bytes),
be64toh(msg->data.session_counters
.control_output_packets),
be64toh(msg->data.session_counters.echo_input_bytes),
be64toh(msg->data.session_counters.echo_input_packets),
be64toh(msg->data.session_counters.echo_output_bytes),
be64toh(msg->data.session_counters
.echo_output_packets));
break;
}
}
/**
* Gets the next unused non zero identification.
*
* \param bdc the data plane context.
*
* \returns next usable id.
*/
static uint16_t bfd_dplane_next_id(struct bfd_dplane_ctx *bdc)
{
bdc->last_id++;
/* Don't use reserved id `0`. */
if (bdc->last_id == 0)
bdc->last_id = 1;
return bdc->last_id;
}
static ssize_t bfd_dplane_flush(struct bfd_dplane_ctx *bdc)
{
ssize_t total = 0;
int rv;
while (STREAM_READABLE(bdc->outbuf)) {
/* Flush buffer contents to socket. */
rv = stream_flush(bdc->outbuf, bdc->sock);
if (rv == -1) {
/* Interruption: try again. */
if (errno == EAGAIN || errno == EWOULDBLOCK
|| errno == EINTR)
continue;
zlog_warn("%s: socket failed: %s", __func__,
strerror(errno));
bfd_dplane_ctx_free(bdc);
return 0;
}
if (rv == 0) {
if (bglobal.debug_dplane)
zlog_info("%s: connection closed", __func__);
bfd_dplane_ctx_free(bdc);
return 0;
}
/* Account total written. */
total += rv;
/* Account output bytes. */
bdc->out_bytes += (uint64_t)rv;
/* Forward pointer. */
stream_forward_getp(bdc->outbuf, (size_t)rv);
}
/* Make more space for new data. */
stream_pulldown(bdc->outbuf);
/* Disable write ready events. */
EVENT_OFF(bdc->outbufev);
return total;
}
static void bfd_dplane_write(struct event *t)
{
struct bfd_dplane_ctx *bdc = EVENT_ARG(t);
/* Handle connection stage. */
if (bdc->connecting && bfd_dplane_client_connecting(bdc))
return;
bfd_dplane_flush(bdc);
}
static void
bfd_dplane_session_state_change(struct bfd_dplane_ctx *bdc,
const struct bfddp_state_change *state)
{
struct bfd_session *bs;
uint32_t flags;
int old_state;
/* Look up session. */
bs = bfd_id_lookup(ntohl(state->lid));
if (bs == NULL) {
if (bglobal.debug_dplane)
zlog_debug("%s: failed to find session to update",
__func__);
return;
}
flags = ntohl(state->remote_flags);
old_state = bs->ses_state;
/* Update session state. */
bs->ses_state = state->state;
bs->remote_diag = state->diagnostics;
bs->discrs.remote_discr = ntohl(state->rid);
bs->remote_cbit = !!(flags & RBIT_CPI);
bs->remote_detect_mult = state->detection_multiplier;
bs->remote_timers.desired_min_tx = ntohl(state->desired_tx);
bs->remote_timers.required_min_rx = ntohl(state->required_rx);
bs->remote_timers.required_min_echo = ntohl(state->required_echo_rx);
/* Notify and update counters. */
ptm_bfd_notify(bs, bs->ses_state);
/* No state change. */
if (old_state == bs->ses_state)
return;
switch (bs->ses_state) {
case PTM_BFD_ADM_DOWN:
case PTM_BFD_DOWN:
/* Both states mean down. */
if (old_state == PTM_BFD_ADM_DOWN || old_state == PTM_BFD_DOWN)
break;
monotime(&bs->downtime);
bs->stats.session_down++;
break;
case PTM_BFD_UP:
monotime(&bs->uptime);
bs->stats.session_up++;
break;
case PTM_BFD_INIT:
/* NOTHING */
break;
default:
zlog_warn("%s: unhandled new state %d", __func__,
bs->ses_state);
break;
}
if (bglobal.debug_peer_event)
zlog_debug("state-change: [data plane: %s] %s -> %s",
bs_to_string(bs), state_list[old_state].str,
state_list[bs->ses_state].str);
}
/**
* Enqueue message in output buffer.
*
* \param[in,out] bdc data plane client context.
* \param[in] buf the message to buffer.
* \param[in] buflen the amount of bytes to buffer.
*
* \returns `-1` on failure (buffer full) or `0` on success.
*/
static int bfd_dplane_enqueue(struct bfd_dplane_ctx *bdc, const void *buf,
size_t buflen)
{
size_t rlen;
/* Handle not connected yet client. */
if (bdc->client && bdc->sock == -1)
return -1;
/* Not enough space. */
if (buflen > STREAM_WRITEABLE(bdc->outbuf)) {
bdc->out_fullev++;
return -1;
}
/* Show debug message if active. */
bfd_dplane_debug_message((struct bfddp_message *)buf);
/* Buffer the message. */
stream_write(bdc->outbuf, buf, buflen);
/* Account message as sent. */
bdc->out_msgs++;
/* Register peak buffered bytes. */
rlen = STREAM_READABLE(bdc->outbuf);
if (bdc->out_bytes_peak < rlen)
bdc->out_bytes_peak = rlen;
/* Schedule if it is not yet. */
if (bdc->outbufev == NULL)
event_add_write(master, bfd_dplane_write, bdc, bdc->sock,
&bdc->outbufev);
return 0;
}
static void bfd_dplane_echo_request_handle(struct bfd_dplane_ctx *bdc,
const struct bfddp_message *bm)
{
struct bfddp_message msg = {};
uint16_t msglen = sizeof(msg.header) + sizeof(msg.data.echo);
struct timeval tv;
gettimeofday(&tv, NULL);
/* Prepare header. */
msg.header.version = BFD_DP_VERSION;
msg.header.type = htons(ECHO_REPLY);
msg.header.length = htons(msglen);
/* Prepare payload. */
msg.data.echo.dp_time = bm->data.echo.dp_time;
msg.data.echo.bfdd_time =
htobe64((uint64_t)((tv.tv_sec * 1000000) + tv.tv_usec));
/* Enqueue for output. */
bfd_dplane_enqueue(bdc, &msg, msglen);
}
static void bfd_dplane_handle_message(struct bfddp_message *msg, void *arg)
{
enum bfddp_message_type bmt;
struct bfd_dplane_ctx *bdc = arg;
/* Call the appropriated handler. */
bmt = ntohs(msg->header.type);
switch (bmt) {
case ECHO_REQUEST:
bfd_dplane_echo_request_handle(bdc, msg);
break;
case BFD_STATE_CHANGE:
bfd_dplane_session_state_change(bdc, &msg->data.state);
break;
case ECHO_REPLY:
/* NOTHING: we don't do anything with this information. */
break;
case DP_ADD_SESSION:
case DP_DELETE_SESSION:
case DP_REQUEST_SESSION_COUNTERS:
/* NOTHING: we are not supposed to receive this. */
break;
case BFD_SESSION_COUNTERS:
/*
* NOTHING: caller of DP_REQUEST_SESSION_COUNTERS should
* handle this with `bfd_dplane_expect`.
*/
break;
default:
zlog_debug("%s: unhandled message type %d", __func__, bmt);
break;
}
}
/**
* Reads the socket immediately to receive data plane answer to query.
*
* \param bdc the data plane context.
* \param id the message ID waiting response.
* \param cb the callback to call when ready.
* \param arg the callback argument.
*
* \return
* `-2` on unavailability (try again), `-1` on failure or `0` on success.
*/
static int bfd_dplane_expect(struct bfd_dplane_ctx *bdc, uint16_t id,
bfd_dplane_expect_cb cb, void *arg)
{
struct bfddp_message_header *bh;
size_t rlen = 0, reads = 0;
ssize_t rv;
/*
* Don't attempt to read if buffer is full, otherwise we'll get a
* bogus 'connection closed' signal (rv == 0).
*/
if (bdc->inbuf->endp == bdc->inbuf->size)
goto skip_read;
read_again:
/* Attempt to read message from client. */
rv = stream_read_try(bdc->inbuf, bdc->sock,
STREAM_WRITEABLE(bdc->inbuf));
if (rv == 0) {
if (bglobal.debug_dplane)
zlog_info("%s: socket closed", __func__);
bfd_dplane_ctx_free(bdc);
return -1;
}
if (rv == -1) {
zlog_warn("%s: socket failed: %s", __func__, strerror(errno));
bfd_dplane_ctx_free(bdc);
return -1;
}
/* We got interrupted, reschedule read. */
if (rv == -2)
return -2;
/* Account read bytes. */
bdc->in_bytes += (uint64_t)rv;
/* Register peak buffered bytes. */
rlen = STREAM_READABLE(bdc->inbuf);
if (bdc->in_bytes_peak < rlen)
bdc->in_bytes_peak = rlen;
skip_read:
while (rlen > 0) {
bh = (struct bfddp_message_header *)stream_pnt(bdc->inbuf);
/* Not enough data read. */
if (ntohs(bh->length) > rlen)
goto read_again;
/* Account full message read. */
bdc->in_msgs++;
/* Account this message as whole read for buffer reorganize. */
reads++;
/* Check for bad version. */
if (bh->version != BFD_DP_VERSION) {
zlog_err("%s: bad data plane client version: %d",
__func__, bh->version);
return -1;
}
/* Show debug message if active. */
bfd_dplane_debug_message((struct bfddp_message *)bh);
/*
* Handle incoming message with callback if the ID matches,
* otherwise fallback to default handler.
*/
if (id && ntohs(bh->id) == id)
cb((struct bfddp_message *)bh, arg);
else
bfd_dplane_handle_message((struct bfddp_message *)bh,
bdc);
/* Advance current read pointer. */
stream_forward_getp(bdc->inbuf, ntohs(bh->length));
/* Reduce the buffer available bytes. */
rlen -= ntohs(bh->length);
/* Reorganize buffer to handle more bytes read. */
if (reads >= 3) {
stream_pulldown(bdc->inbuf);
reads = 0;
}
/* We found the message, return to caller. */
if (id && ntohs(bh->id) == id)
break;
}
return 0;
}
static void bfd_dplane_read(struct event *t)
{
struct bfd_dplane_ctx *bdc = EVENT_ARG(t);
int rv;
rv = bfd_dplane_expect(bdc, 0, bfd_dplane_handle_message, NULL);
if (rv == -1)
return;
stream_pulldown(bdc->inbuf);
event_add_read(master, bfd_dplane_read, bdc, bdc->sock, &bdc->inbufev);
}
static void _bfd_session_register_dplane(struct hash_bucket *hb, void *arg)
{
struct bfd_session *bs = hb->data;
struct bfd_dplane_ctx *bdc = arg;
if (bs->bdc != NULL)
return;
/* Disable software session. */
bfd_session_disable(bs);
/* Move session to data plane. */
_bfd_dplane_add_session(bdc, bs);
}
static struct bfd_dplane_ctx *bfd_dplane_ctx_new(int sock)
{
struct bfd_dplane_ctx *bdc;
bdc = XCALLOC(MTYPE_BFDD_DPLANE_CTX, sizeof(*bdc));
bdc->sock = sock;
bdc->inbuf = stream_new(BFD_DPLANE_CLIENT_BUF_SIZE);
bdc->outbuf = stream_new(BFD_DPLANE_CLIENT_BUF_SIZE);
/* If not socket ready, skip read and session registration. */
if (sock == -1)
return bdc;
event_add_read(master, bfd_dplane_read, bdc, sock, &bdc->inbufev);
/* Register all unattached sessions. */
bfd_key_iterate(_bfd_session_register_dplane, bdc);
return bdc;
}
static void _bfd_session_unregister_dplane(struct hash_bucket *hb, void *arg)
{
struct bfd_session *bs = hb->data;
struct bfd_dplane_ctx *bdc = arg;
if (bs->bdc != bdc)
return;
bs->bdc = NULL;
/* Fallback to software. */
bfd_session_enable(bs);
}
static void bfd_dplane_ctx_free(struct bfd_dplane_ctx *bdc)
{
if (bglobal.debug_dplane)
zlog_debug("%s: terminating data plane client %d", __func__,
bdc->sock);
/* Client mode has special treatment. */
if (bdc->client) {
/* Disable connection event if any. */
EVENT_OFF(bdc->connectev);
/* Normal treatment on shutdown. */
if (bglobal.bg_shutdown)
goto free_resources;
/* Attempt reconnection. */
socket_close(&bdc->sock);
EVENT_OFF(bdc->inbufev);
EVENT_OFF(bdc->outbufev);
event_add_timer(master, bfd_dplane_client_connect, bdc, 3,
&bdc->connectev);
return;
}
free_resources:
/* Remove from the list of attached data planes. */
TAILQ_REMOVE(&bglobal.bg_dplaneq, bdc, entry);
/* Detach all associated sessions. */
if (bglobal.bg_shutdown == false)
bfd_key_iterate(_bfd_session_unregister_dplane, bdc);
/* Free resources. */
socket_close(&bdc->sock);
stream_free(bdc->inbuf);
stream_free(bdc->outbuf);
EVENT_OFF(bdc->inbufev);
EVENT_OFF(bdc->outbufev);
XFREE(MTYPE_BFDD_DPLANE_CTX, bdc);
}
static void _bfd_dplane_session_fill(const struct bfd_session *bs,
struct bfddp_message *msg)
{
uint16_t msglen = sizeof(msg->header) + sizeof(msg->data.session);
/* Message header. */
msg->header.version = BFD_DP_VERSION;
msg->header.length = ntohs(msglen);
msg->header.type = ntohs(DP_ADD_SESSION);
/* Message payload. */
msg->data.session.dst = bs->key.peer;
msg->data.session.src = bs->key.local;
msg->data.session.detect_mult = bs->detect_mult;
if (bs->ifp) {
msg->data.session.ifindex = htonl(bs->ifp->ifindex);
strlcpy(msg->data.session.ifname, bs->ifp->name,
sizeof(msg->data.session.ifname));
}
if (bs->flags & BFD_SESS_FLAG_MH) {
msg->data.session.flags |= SESSION_MULTIHOP;
msg->data.session.ttl = bs->mh_ttl;
} else
msg->data.session.ttl = BFD_TTL_VAL;
if (bs->flags & BFD_SESS_FLAG_IPV6)
msg->data.session.flags |= SESSION_IPV6;
if (bs->flags & BFD_SESS_FLAG_ECHO)
msg->data.session.flags |= SESSION_ECHO;
if (bs->flags & BFD_SESS_FLAG_CBIT)
msg->data.session.flags |= SESSION_CBIT;
if (bs->flags & BFD_SESS_FLAG_PASSIVE)
msg->data.session.flags |= SESSION_PASSIVE;
if (bs->flags & BFD_SESS_FLAG_SHUTDOWN)
msg->data.session.flags |= SESSION_SHUTDOWN;
msg->data.session.flags = htonl(msg->data.session.flags);
msg->data.session.lid = htonl(bs->discrs.my_discr);
msg->data.session.min_tx = htonl(bs->timers.desired_min_tx);
msg->data.session.min_rx = htonl(bs->timers.required_min_rx);
msg->data.session.min_echo_tx = htonl(bs->timers.desired_min_echo_tx);
msg->data.session.min_echo_rx = htonl(bs->timers.required_min_echo_rx);
}
static int _bfd_dplane_add_session(struct bfd_dplane_ctx *bdc,
struct bfd_session *bs)
{
int rv;
/* Associate session. */
bs->bdc = bdc;
/* Reset previous state. */
bs->remote_diag = 0;
bs->local_diag = 0;
bs->ses_state = PTM_BFD_DOWN;
/* Enqueue message to data plane client. */
rv = bfd_dplane_update_session(bs);
if (rv != 0)
bs->bdc = NULL;
return rv;
}
static void _bfd_dplane_update_session_counters(struct bfddp_message *msg,
void *arg)
{
struct bfd_session *bs = arg;
bs->stats.rx_ctrl_pkt =
be64toh(msg->data.session_counters.control_input_packets);
bs->stats.tx_ctrl_pkt =
be64toh(msg->data.session_counters.control_output_packets);
bs->stats.rx_echo_pkt =
be64toh(msg->data.session_counters.echo_input_packets);
bs->stats.tx_echo_pkt =
be64toh(msg->data.session_counters.echo_output_bytes);
}
/**
* Send message to data plane requesting the session counters.
*
* \param bs the BFD session.
*
* \returns `0` on failure or the request id.
*/
static uint16_t bfd_dplane_request_counters(const struct bfd_session *bs)
{
struct bfddp_message msg = {};
size_t msglen = sizeof(msg.header) + sizeof(msg.data.counters_req);
/* Fill header information. */
msg.header.version = BFD_DP_VERSION;
msg.header.length = htons(msglen);
msg.header.type = htons(DP_REQUEST_SESSION_COUNTERS);
msg.header.id = htons(bfd_dplane_next_id(bs->bdc));
/* Session to get counters. */
msg.data.counters_req.lid = htonl(bs->discrs.my_discr);
/* If enqueue failed, let caller know. */
if (bfd_dplane_enqueue(bs->bdc, &msg, msglen) == -1)
return 0;
/* Flush socket. */
bfd_dplane_flush(bs->bdc);
return ntohs(msg.header.id);
}
/*
* Data plane listening socket.
*/
static void bfd_dplane_accept(struct event *t)
{
struct bfd_global *bg = EVENT_ARG(t);
struct bfd_dplane_ctx *bdc;
int sock;
/* Accept new connection. */
sock = accept(bg->bg_dplane_sock, NULL, 0);
if (sock == -1) {
zlog_warn("%s: accept failed: %s", __func__, strerror(errno));
goto reschedule_and_return;
}
/* Create and handle new connection. */
bdc = bfd_dplane_ctx_new(sock);
TAILQ_INSERT_TAIL(&bglobal.bg_dplaneq, bdc, entry);
if (bglobal.debug_dplane)
zlog_debug("%s: new data plane client connected", __func__);
reschedule_and_return:
event_add_read(master, bfd_dplane_accept, bg, bg->bg_dplane_sock,
&bglobal.bg_dplane_sockev);
}
/*
* Data plane connecting socket.
*/
static void _bfd_dplane_client_bootstrap(struct bfd_dplane_ctx *bdc)
{
bdc->connecting = false;
/* Clean up buffers. */
stream_reset(bdc->inbuf);
stream_reset(bdc->outbuf);
/* Ask for read notifications. */
event_add_read(master, bfd_dplane_read, bdc, bdc->sock, &bdc->inbufev);
/* Remove all sessions then register again to send them all. */
bfd_key_iterate(_bfd_session_unregister_dplane, bdc);
bfd_key_iterate(_bfd_session_register_dplane, bdc);
}
static bool bfd_dplane_client_connecting(struct bfd_dplane_ctx *bdc)
{
int rv;
socklen_t rvlen = sizeof(rv);
/* Make sure `errno` is reset, then test `getsockopt` success. */
errno = 0;
if (getsockopt(bdc->sock, SOL_SOCKET, SO_ERROR, &rv, &rvlen) == -1)
rv = -1;
/* Connection successful. */
if (rv == 0) {
if (bglobal.debug_dplane)
zlog_debug("%s: connected to server: %d", __func__,
bdc->sock);
_bfd_dplane_client_bootstrap(bdc);
return false;
}
switch (rv) {
case EINTR:
case EAGAIN:
case EALREADY:
case EINPROGRESS:
/* non error, wait more. */
return true;
default:
zlog_warn("%s: connection failed: %s", __func__,
strerror(errno));
bfd_dplane_ctx_free(bdc);
return true;
}
}
static void bfd_dplane_client_connect(struct event *t)
{
struct bfd_dplane_ctx *bdc = EVENT_ARG(t);
int rv, sock;
socklen_t rvlen = sizeof(rv);
/* Allocate new socket. */
sock = socket(bdc->addr.sa.sa_family, SOCK_STREAM, 0);
if (sock == -1) {
zlog_warn("%s: failed to initialize socket: %s", __func__,
strerror(errno));
goto reschedule_connect;
}
/* Set non blocking socket. */
set_nonblocking(sock);
/* Set 'no delay' (disables nagle algorithm) for IPv4/IPv6. */
rv = 1;
if (bdc->addr.sa.sa_family != AF_UNIX
&& setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &rv, rvlen) == -1)
zlog_warn("%s: TCP_NODELAY: %s", __func__, strerror(errno));
/* Attempt to connect. */
rv = connect(sock, &bdc->addr.sa, bdc->addrlen);
if (rv == -1 && (errno != EINPROGRESS && errno != EAGAIN)) {
zlog_warn("%s: data plane connection failed: %s", __func__,
strerror(errno));
goto reschedule_connect;
}
bdc->sock = sock;
if (rv == -1) {
if (bglobal.debug_dplane)
zlog_debug("%s: server connection in progress: %d",
__func__, sock);
/* If we are not connected yet, ask for write notifications. */
bdc->connecting = true;
event_add_write(master, bfd_dplane_write, bdc, bdc->sock,
&bdc->outbufev);
} else {
if (bglobal.debug_dplane)
zlog_debug("%s: server connection: %d", __func__, sock);
/* Otherwise just start accepting data. */
_bfd_dplane_client_bootstrap(bdc);
}
reschedule_connect:
EVENT_OFF(bdc->inbufev);
EVENT_OFF(bdc->outbufev);
socket_close(&sock);
event_add_timer(master, bfd_dplane_client_connect, bdc, 3,
&bdc->connectev);
}
static void bfd_dplane_client_init(const struct sockaddr *sa, socklen_t salen)
{
struct bfd_dplane_ctx *bdc;
/* Allocate context and copy address for reconnection. */
bdc = bfd_dplane_ctx_new(-1);
if (salen <= sizeof(bdc->addr)) {
memcpy(&bdc->addr, sa, salen);
bdc->addrlen = sizeof(bdc->addr);
} else {
memcpy(&bdc->addr, sa, sizeof(bdc->addr));
bdc->addrlen = sizeof(bdc->addr);
zlog_warn("%s: server address truncated (from %d to %d)",
__func__, salen, bdc->addrlen);
}
bdc->client = true;
event_add_timer(master, bfd_dplane_client_connect, bdc, 0,
&bdc->connectev);
/* Insert into data plane lists. */
TAILQ_INSERT_TAIL(&bglobal.bg_dplaneq, bdc, entry);
}
/**
* Termination phase of the distributed BFD infrastructure: free all allocated
* resources.
*/
static int bfd_dplane_finish_late(void)
{
struct bfd_dplane_ctx *bdc;
if (bglobal.debug_dplane)
zlog_debug("%s: terminating distributed BFD", __func__);
/* Free all data plane client contexts. */
while ((bdc = TAILQ_FIRST(&bglobal.bg_dplaneq)) != NULL)
bfd_dplane_ctx_free(bdc);
/* Cancel accept thread and close socket. */
EVENT_OFF(bglobal.bg_dplane_sockev);