mirror of
https://passt.top/passt
synced 2024-12-22 21:55:22 +00:00
9e4615b40b
Don't report bogus failures (with --trace) just because the return value is not zero. Link: https://github.com/containers/podman/issues/24219 Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
764 lines
18 KiB
C
764 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
/* PASTA - Pack A Subtle Tap Abstraction
|
|
* for network namespace/tap device mode
|
|
*
|
|
* tcp_splice.c - direct namespace forwarding for local connections
|
|
*
|
|
* Copyright (c) 2020-2022 Red Hat GmbH
|
|
* Author: Stefano Brivio <sbrivio@redhat.com>
|
|
*/
|
|
|
|
/**
|
|
* DOC: Theory of Operation
|
|
*
|
|
*
|
|
* For local traffic directed to TCP ports configured for direct
|
|
* mapping between namespaces, packets are directly translated between
|
|
* L4 sockets using a pair of splice() syscalls. These connections are
|
|
* tracked by struct tcp_splice_conn entries in the @tc array, using
|
|
* these events:
|
|
*
|
|
* - SPLICE_CONNECT: connection accepted, connecting to target
|
|
* - SPLICE_ESTABLISHED: connection to target established
|
|
* - OUT_WAIT_0: pipe to accepted socket full, wait for EPOLLOUT
|
|
* - OUT_WAIT_1: pipe to target socket full, wait for EPOLLOUT
|
|
* - FIN_RCVD_0: FIN (EPOLLRDHUP) seen from accepted socket
|
|
* - FIN_RCVD_1: FIN (EPOLLRDHUP) seen from target socket
|
|
* - FIN_SENT_0: FIN (write shutdown) sent to accepted socket
|
|
* - FIN_SENT_1: FIN (write shutdown) sent to target socket
|
|
*
|
|
* #syscalls:pasta pipe2|pipe fcntl arm:fcntl64 ppc64:fcntl64 i686:fcntl64
|
|
*/
|
|
|
|
#include <sched.h>
|
|
#include <unistd.h>
|
|
#include <signal.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <net/ethernet.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/tcp.h>
|
|
#include <sys/epoll.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include "util.h"
|
|
#include "ip.h"
|
|
#include "passt.h"
|
|
#include "log.h"
|
|
#include "tcp_splice.h"
|
|
#include "siphash.h"
|
|
#include "inany.h"
|
|
#include "flow.h"
|
|
|
|
#include "flow_table.h"
|
|
|
|
#define MAX_PIPE_SIZE (8UL * 1024 * 1024)
|
|
#define TCP_SPLICE_PIPE_POOL_SIZE 32
|
|
#define TCP_SPLICE_CONN_PRESSURE 30 /* % of conn_count */
|
|
#define TCP_SPLICE_FILE_PRESSURE 30 /* % of c->nofile */
|
|
|
|
/* Pools for pre-opened sockets (in namespace) */
|
|
#define TCP_SOCK_POOL_TSH 16 /* Refill in ns if > x used */
|
|
|
|
static int ns_sock_pool4 [TCP_SOCK_POOL_SIZE];
|
|
static int ns_sock_pool6 [TCP_SOCK_POOL_SIZE];
|
|
|
|
/* Pool of pre-opened pipes */
|
|
static int splice_pipe_pool [TCP_SPLICE_PIPE_POOL_SIZE][2];
|
|
|
|
#define CONN_HAS(conn, set) (((conn)->events & (set)) == (set))
|
|
|
|
/* Display strings for connection events */
|
|
static const char *tcp_splice_event_str[] __attribute((__unused__)) = {
|
|
"SPLICE_CONNECT", "SPLICE_ESTABLISHED", "OUT_WAIT_0", "OUT_WAIT_1",
|
|
"FIN_RCVD_0", "FIN_RCVD_1", "FIN_SENT_0", "FIN_SENT_1",
|
|
};
|
|
|
|
/* Display strings for connection flags */
|
|
static const char *tcp_splice_flag_str[] __attribute((__unused__)) = {
|
|
"SPLICE_V6", "RCVLOWAT_SET_0", "RCVLOWAT_SET_1", "RCVLOWAT_ACT_0",
|
|
"RCVLOWAT_ACT_1", "CLOSING",
|
|
};
|
|
|
|
/* Forward declaration */
|
|
static int tcp_sock_refill_ns(void *arg);
|
|
static int tcp_conn_sock_ns(const struct ctx *c, sa_family_t af);
|
|
|
|
/**
|
|
* conn_at_sidx() - Get spliced TCP connection specific flow at given sidx
|
|
* @sidx: Flow and side to retrieve
|
|
*
|
|
* Return: Spliced TCP connection at @sidx, or NULL of @sidx is invalid.
|
|
* Asserts if the flow at @sidx is not FLOW_TCP_SPLICE.
|
|
*/
|
|
static struct tcp_splice_conn *conn_at_sidx(flow_sidx_t sidx)
|
|
{
|
|
union flow *flow = flow_at_sidx(sidx);
|
|
|
|
if (!flow)
|
|
return NULL;
|
|
|
|
ASSERT(flow->f.type == FLOW_TCP_SPLICE);
|
|
return &flow->tcp_splice;
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_conn_epoll_events() - epoll events masks for given state
|
|
* @events: Connection event flags
|
|
* @ev: Events to fill in, 0 is accepted socket, 1 is connecting socket
|
|
*/
|
|
static void tcp_splice_conn_epoll_events(uint16_t events,
|
|
struct epoll_event ev[])
|
|
{
|
|
unsigned sidei;
|
|
|
|
flow_foreach_sidei(sidei)
|
|
ev[sidei].events = 0;
|
|
|
|
if (events & SPLICE_ESTABLISHED) {
|
|
flow_foreach_sidei(sidei) {
|
|
if (!(events & FIN_SENT(!sidei)))
|
|
ev[sidei].events = EPOLLIN | EPOLLRDHUP;
|
|
}
|
|
} else if (events & SPLICE_CONNECT) {
|
|
ev[1].events = EPOLLOUT;
|
|
}
|
|
|
|
flow_foreach_sidei(sidei)
|
|
ev[sidei].events |= (events & OUT_WAIT(sidei)) ? EPOLLOUT : 0;
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_epoll_ctl() - Add/modify/delete epoll state from connection events
|
|
* @c: Execution context
|
|
* @conn: Connection pointer
|
|
*
|
|
* Return: 0 on success, negative error code on failure (not on deletion)
|
|
*/
|
|
static int tcp_splice_epoll_ctl(const struct ctx *c,
|
|
struct tcp_splice_conn *conn)
|
|
{
|
|
int m = conn->in_epoll ? EPOLL_CTL_MOD : EPOLL_CTL_ADD;
|
|
const union epoll_ref ref[SIDES] = {
|
|
{ .type = EPOLL_TYPE_TCP_SPLICE, .fd = conn->s[0],
|
|
.flowside = FLOW_SIDX(conn, 0) },
|
|
{ .type = EPOLL_TYPE_TCP_SPLICE, .fd = conn->s[1],
|
|
.flowside = FLOW_SIDX(conn, 1) }
|
|
};
|
|
struct epoll_event ev[SIDES] = { { .data.u64 = ref[0].u64 },
|
|
{ .data.u64 = ref[1].u64 } };
|
|
|
|
tcp_splice_conn_epoll_events(conn->events, ev);
|
|
|
|
if (epoll_ctl(c->epollfd, m, conn->s[0], &ev[0]) ||
|
|
epoll_ctl(c->epollfd, m, conn->s[1], &ev[1])) {
|
|
int ret = -errno;
|
|
flow_err(conn, "ERROR on epoll_ctl(): %s", strerror(errno));
|
|
return ret;
|
|
}
|
|
|
|
conn->in_epoll = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* conn_flag_do() - Set/unset given flag, log, update epoll on CLOSING flag
|
|
* @c: Execution context
|
|
* @conn: Connection pointer
|
|
* @flag: Flag to set, or ~flag to unset
|
|
*/
|
|
static void conn_flag_do(const struct ctx *c, struct tcp_splice_conn *conn,
|
|
unsigned long flag)
|
|
{
|
|
if (flag & (flag - 1)) {
|
|
int flag_index = fls(~flag);
|
|
|
|
if (!(conn->flags & ~flag))
|
|
return;
|
|
|
|
conn->flags &= flag;
|
|
if (flag_index >= 0)
|
|
flow_dbg(conn, "%s dropped",
|
|
tcp_splice_flag_str[flag_index]);
|
|
} else {
|
|
int flag_index = fls(flag);
|
|
|
|
if (conn->flags & flag)
|
|
return;
|
|
|
|
conn->flags |= flag;
|
|
if (flag_index >= 0)
|
|
flow_dbg(conn, "%s", tcp_splice_flag_str[flag_index]);
|
|
}
|
|
|
|
if (flag == CLOSING) {
|
|
epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->s[0], NULL);
|
|
epoll_ctl(c->epollfd, EPOLL_CTL_DEL, conn->s[1], NULL);
|
|
}
|
|
}
|
|
|
|
#define conn_flag(c, conn, flag) \
|
|
do { \
|
|
flow_trace(conn, "flag at %s:%i", __func__, __LINE__); \
|
|
conn_flag_do(c, conn, flag); \
|
|
} while (0)
|
|
|
|
/**
|
|
* conn_event_do() - Set and log connection events, update epoll state
|
|
* @c: Execution context
|
|
* @conn: Connection pointer
|
|
* @event: Connection event
|
|
*/
|
|
static void conn_event_do(const struct ctx *c, struct tcp_splice_conn *conn,
|
|
unsigned long event)
|
|
{
|
|
if (event & (event - 1)) {
|
|
int flag_index = fls(~event);
|
|
|
|
if (!(conn->events & ~event))
|
|
return;
|
|
|
|
conn->events &= event;
|
|
if (flag_index >= 0)
|
|
flow_dbg(conn, "~%s", tcp_splice_event_str[flag_index]);
|
|
} else {
|
|
int flag_index = fls(event);
|
|
|
|
if (conn->events & event)
|
|
return;
|
|
|
|
conn->events |= event;
|
|
if (flag_index >= 0)
|
|
flow_dbg(conn, "%s", tcp_splice_event_str[flag_index]);
|
|
}
|
|
|
|
if (tcp_splice_epoll_ctl(c, conn))
|
|
conn_flag(c, conn, CLOSING);
|
|
}
|
|
|
|
#define conn_event(c, conn, event) \
|
|
do { \
|
|
flow_trace(conn, "event at %s:%i",__func__, __LINE__); \
|
|
conn_event_do(c, conn, event); \
|
|
} while (0)
|
|
|
|
|
|
/**
|
|
* tcp_splice_flow_defer() - Deferred per-flow handling (clean up closed)
|
|
* @conn: Connection entry to handle
|
|
*
|
|
* Return: true if the flow is ready to free, false otherwise
|
|
*/
|
|
bool tcp_splice_flow_defer(struct tcp_splice_conn *conn)
|
|
{
|
|
unsigned sidei;
|
|
|
|
if (!(conn->flags & CLOSING))
|
|
return false;
|
|
|
|
flow_foreach_sidei(sidei) {
|
|
/* Flushing might need to block: don't recycle them. */
|
|
if (conn->pipe[sidei][0] >= 0) {
|
|
close(conn->pipe[sidei][0]);
|
|
close(conn->pipe[sidei][1]);
|
|
conn->pipe[sidei][0] = conn->pipe[sidei][1] = -1;
|
|
}
|
|
|
|
if (conn->s[sidei] >= 0) {
|
|
close(conn->s[sidei]);
|
|
conn->s[sidei] = -1;
|
|
}
|
|
|
|
conn->read[sidei] = conn->written[sidei] = 0;
|
|
}
|
|
|
|
conn->events = SPLICE_CLOSED;
|
|
conn->flags = 0;
|
|
flow_dbg(conn, "CLOSED");
|
|
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_connect_finish() - Completion of connect() or call on success
|
|
* @c: Execution context
|
|
* @conn: Connection pointer
|
|
*
|
|
* Return: 0 on success, -EIO on failure
|
|
*/
|
|
static int tcp_splice_connect_finish(const struct ctx *c,
|
|
struct tcp_splice_conn *conn)
|
|
{
|
|
unsigned sidei;
|
|
int i = 0;
|
|
|
|
flow_foreach_sidei(sidei) {
|
|
for (; i < TCP_SPLICE_PIPE_POOL_SIZE; i++) {
|
|
if (splice_pipe_pool[i][0] >= 0) {
|
|
SWAP(conn->pipe[sidei][0],
|
|
splice_pipe_pool[i][0]);
|
|
SWAP(conn->pipe[sidei][1],
|
|
splice_pipe_pool[i][1]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (conn->pipe[sidei][0] < 0) {
|
|
if (pipe2(conn->pipe[sidei], O_NONBLOCK | O_CLOEXEC)) {
|
|
flow_err(conn, "cannot create %d->%d pipe: %s",
|
|
sidei, !sidei, strerror(errno));
|
|
conn_flag(c, conn, CLOSING);
|
|
return -EIO;
|
|
}
|
|
|
|
if (fcntl(conn->pipe[sidei][0], F_SETPIPE_SZ,
|
|
c->tcp.pipe_size) != (int)c->tcp.pipe_size) {
|
|
flow_trace(conn,
|
|
"cannot set %d->%d pipe size to %zu",
|
|
sidei, !sidei, c->tcp.pipe_size);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!(conn->events & SPLICE_ESTABLISHED))
|
|
conn_event(c, conn, SPLICE_ESTABLISHED);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_connect() - Create and connect socket for new spliced connection
|
|
* @c: Execution context
|
|
* @conn: Connection pointer
|
|
*
|
|
* Return: 0 for connect() succeeded or in progress, negative value on error
|
|
*/
|
|
static int tcp_splice_connect(const struct ctx *c, struct tcp_splice_conn *conn)
|
|
{
|
|
const struct flowside *tgt = &conn->f.side[TGTSIDE];
|
|
sa_family_t af = inany_v4(&tgt->eaddr) ? AF_INET : AF_INET6;
|
|
uint8_t tgtpif = conn->f.pif[TGTSIDE];
|
|
union sockaddr_inany sa;
|
|
socklen_t sl;
|
|
|
|
if (tgtpif == PIF_HOST)
|
|
conn->s[1] = tcp_conn_sock(c, af);
|
|
else if (tgtpif == PIF_SPLICE)
|
|
conn->s[1] = tcp_conn_sock_ns(c, af);
|
|
else
|
|
ASSERT(0);
|
|
|
|
if (conn->s[1] < 0)
|
|
return -1;
|
|
|
|
if (setsockopt(conn->s[1], SOL_TCP, TCP_QUICKACK,
|
|
&((int){ 1 }), sizeof(int))) {
|
|
flow_trace(conn, "failed to set TCP_QUICKACK on socket %i",
|
|
conn->s[1]);
|
|
}
|
|
|
|
pif_sockaddr(c, &sa, &sl, tgtpif, &tgt->eaddr, tgt->eport);
|
|
|
|
if (connect(conn->s[1], &sa.sa, sl)) {
|
|
if (errno != EINPROGRESS) {
|
|
flow_trace(conn, "Couldn't connect socket for splice: %s",
|
|
strerror(errno));
|
|
return -errno;
|
|
}
|
|
|
|
conn_event(c, conn, SPLICE_CONNECT);
|
|
} else {
|
|
conn_event(c, conn, SPLICE_ESTABLISHED);
|
|
return tcp_splice_connect_finish(c, conn);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tcp_conn_sock_ns() - Obtain a connectable socket in the namespace
|
|
* @c: Execution context
|
|
* @af: Address family (AF_INET or AF_INET6)
|
|
*
|
|
* Return: Socket fd in the namespace on success, -errno on failure
|
|
*/
|
|
static int tcp_conn_sock_ns(const struct ctx *c, sa_family_t af)
|
|
{
|
|
int *p = af == AF_INET6 ? ns_sock_pool6 : ns_sock_pool4;
|
|
int s;
|
|
|
|
if ((s = tcp_conn_pool_sock(p)) >= 0)
|
|
return s;
|
|
|
|
/* If the pool is empty we have to incur the latency of entering the ns.
|
|
* Therefore, we might as well refill the whole pool while we're at it.
|
|
* This differs from tcp_conn_sock().
|
|
*/
|
|
NS_CALL(tcp_sock_refill_ns, c);
|
|
|
|
if ((s = tcp_conn_pool_sock(p)) >= 0)
|
|
return s;
|
|
|
|
err("TCP: No available ns sockets for new connection");
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_conn_from_sock() - Attempt to init state for a spliced connection
|
|
* @c: Execution context
|
|
* @flow: flow to initialise
|
|
* @s0: Accepted (side 0) socket
|
|
* @sa: Peer address of connection
|
|
*
|
|
* #syscalls:pasta setsockopt
|
|
*/
|
|
void tcp_splice_conn_from_sock(const struct ctx *c, union flow *flow, int s0)
|
|
{
|
|
struct tcp_splice_conn *conn = FLOW_SET_TYPE(flow, FLOW_TCP_SPLICE,
|
|
tcp_splice);
|
|
|
|
ASSERT(c->mode == MODE_PASTA);
|
|
|
|
conn->s[0] = s0;
|
|
conn->s[1] = -1;
|
|
conn->pipe[0][0] = conn->pipe[0][1] = -1;
|
|
conn->pipe[1][0] = conn->pipe[1][1] = -1;
|
|
|
|
if (setsockopt(s0, SOL_TCP, TCP_QUICKACK, &((int){ 1 }), sizeof(int)))
|
|
flow_trace(conn, "failed to set TCP_QUICKACK on %i", s0);
|
|
|
|
if (tcp_splice_connect(c, conn))
|
|
conn_flag(c, conn, CLOSING);
|
|
|
|
FLOW_ACTIVATE(conn);
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_sock_handler() - Handler for socket mapped to spliced connection
|
|
* @c: Execution context
|
|
* @ref: epoll reference
|
|
* @events: epoll events bitmap
|
|
*
|
|
* #syscalls:pasta splice
|
|
*/
|
|
void tcp_splice_sock_handler(struct ctx *c, union epoll_ref ref,
|
|
uint32_t events)
|
|
{
|
|
struct tcp_splice_conn *conn = conn_at_sidx(ref.flowside);
|
|
unsigned evsidei = ref.flowside.sidei, fromsidei;
|
|
uint8_t lowat_set_flag, lowat_act_flag;
|
|
int eof, never_read;
|
|
|
|
ASSERT(conn->f.type == FLOW_TCP_SPLICE);
|
|
|
|
if (conn->events == SPLICE_CLOSED)
|
|
return;
|
|
|
|
if (events & EPOLLERR) {
|
|
int err, rc;
|
|
socklen_t sl = sizeof(err);
|
|
|
|
rc = getsockopt(ref.fd, SOL_SOCKET, SO_ERROR, &err, &sl);
|
|
if (rc)
|
|
flow_err(conn, "Error retrieving SO_ERROR: %s",
|
|
strerror(errno));
|
|
else
|
|
flow_trace(conn, "Error event on socket: %s",
|
|
strerror(err));
|
|
|
|
goto close;
|
|
}
|
|
|
|
if (conn->events == SPLICE_CONNECT) {
|
|
if (!(events & EPOLLOUT))
|
|
goto close;
|
|
if (tcp_splice_connect_finish(c, conn))
|
|
goto close;
|
|
}
|
|
|
|
if (events & EPOLLOUT) {
|
|
fromsidei = !evsidei;
|
|
conn_event(c, conn, ~OUT_WAIT(evsidei));
|
|
} else {
|
|
fromsidei = evsidei;
|
|
}
|
|
|
|
if (events & EPOLLRDHUP)
|
|
/* For side 0 this is fake, but implied */
|
|
conn_event(c, conn, FIN_RCVD(evsidei));
|
|
|
|
swap:
|
|
eof = 0;
|
|
never_read = 1;
|
|
|
|
lowat_set_flag = RCVLOWAT_SET(fromsidei);
|
|
lowat_act_flag = RCVLOWAT_ACT(fromsidei);
|
|
|
|
while (1) {
|
|
ssize_t readlen, written, pending;
|
|
int more = 0;
|
|
|
|
retry:
|
|
readlen = splice(conn->s[fromsidei], NULL,
|
|
conn->pipe[fromsidei][1], NULL,
|
|
c->tcp.pipe_size,
|
|
SPLICE_F_MOVE | SPLICE_F_NONBLOCK);
|
|
flow_trace(conn, "%zi from read-side call", readlen);
|
|
if (readlen < 0) {
|
|
if (errno == EINTR)
|
|
goto retry;
|
|
|
|
if (errno != EAGAIN)
|
|
goto close;
|
|
} else if (!readlen) {
|
|
eof = 1;
|
|
} else {
|
|
never_read = 0;
|
|
|
|
if (readlen >= (long)c->tcp.pipe_size * 90 / 100)
|
|
more = SPLICE_F_MORE;
|
|
|
|
if (conn->flags & lowat_set_flag)
|
|
conn_flag(c, conn, lowat_act_flag);
|
|
}
|
|
|
|
eintr:
|
|
written = splice(conn->pipe[fromsidei][0], NULL,
|
|
conn->s[!fromsidei], NULL, c->tcp.pipe_size,
|
|
SPLICE_F_MOVE | more | SPLICE_F_NONBLOCK);
|
|
flow_trace(conn, "%zi from write-side call (passed %zi)",
|
|
written, c->tcp.pipe_size);
|
|
|
|
/* Most common case: skip updating counters. */
|
|
if (readlen > 0 && readlen == written) {
|
|
if (readlen >= (long)c->tcp.pipe_size * 10 / 100)
|
|
continue;
|
|
|
|
if (conn->flags & lowat_set_flag &&
|
|
readlen > (long)c->tcp.pipe_size / 10) {
|
|
int lowat = c->tcp.pipe_size / 4;
|
|
|
|
if (setsockopt(conn->s[fromsidei], SOL_SOCKET,
|
|
SO_RCVLOWAT,
|
|
&lowat, sizeof(lowat))) {
|
|
flow_trace(conn,
|
|
"Setting SO_RCVLOWAT %i: %s",
|
|
lowat, strerror(errno));
|
|
} else {
|
|
conn_flag(c, conn, lowat_set_flag);
|
|
conn_flag(c, conn, lowat_act_flag);
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
conn->read[fromsidei] += readlen > 0 ? readlen : 0;
|
|
conn->written[fromsidei] += written > 0 ? written : 0;
|
|
|
|
if (written < 0) {
|
|
if (errno == EINTR)
|
|
goto eintr;
|
|
|
|
if (errno != EAGAIN)
|
|
goto close;
|
|
|
|
if (conn->read[fromsidei] == conn->written[fromsidei])
|
|
break;
|
|
|
|
conn_event(c, conn, OUT_WAIT(!fromsidei));
|
|
break;
|
|
}
|
|
|
|
if (never_read && written == (long)(c->tcp.pipe_size))
|
|
goto retry;
|
|
|
|
pending = conn->read[fromsidei] - conn->written[fromsidei];
|
|
if (!never_read && written > 0 && written < pending)
|
|
goto retry;
|
|
|
|
if (eof)
|
|
break;
|
|
}
|
|
|
|
if (conn->read[fromsidei] == conn->written[fromsidei] && eof) {
|
|
unsigned sidei;
|
|
|
|
flow_foreach_sidei(sidei) {
|
|
if ((conn->events & FIN_RCVD(sidei)) &&
|
|
!(conn->events & FIN_SENT(!sidei))) {
|
|
shutdown(conn->s[!sidei], SHUT_WR);
|
|
conn_event(c, conn, FIN_SENT(!sidei));
|
|
}
|
|
}
|
|
}
|
|
|
|
if (CONN_HAS(conn, FIN_SENT(0) | FIN_SENT(1)))
|
|
goto close;
|
|
|
|
if ((events & (EPOLLIN | EPOLLOUT)) == (EPOLLIN | EPOLLOUT)) {
|
|
events = EPOLLIN;
|
|
|
|
fromsidei = !fromsidei;
|
|
goto swap;
|
|
}
|
|
|
|
if (events & EPOLLHUP)
|
|
goto close;
|
|
|
|
return;
|
|
|
|
close:
|
|
conn_flag(c, conn, CLOSING);
|
|
}
|
|
|
|
/**
|
|
* tcp_set_pipe_size() - Set usable pipe size, probe starting from MAX_PIPE_SIZE
|
|
* @c: Execution context
|
|
*/
|
|
static void tcp_set_pipe_size(struct ctx *c)
|
|
{
|
|
int probe_pipe[TCP_SPLICE_PIPE_POOL_SIZE][2], i, j;
|
|
|
|
c->tcp.pipe_size = MAX_PIPE_SIZE;
|
|
|
|
smaller:
|
|
for (i = 0; i < TCP_SPLICE_PIPE_POOL_SIZE; i++) {
|
|
if (pipe2(probe_pipe[i], O_CLOEXEC)) {
|
|
i++;
|
|
break;
|
|
}
|
|
|
|
if (fcntl(probe_pipe[i][0], F_SETPIPE_SZ, c->tcp.pipe_size) < 0)
|
|
break;
|
|
}
|
|
|
|
for (j = i - 1; j >= 0; j--) {
|
|
close(probe_pipe[j][0]);
|
|
close(probe_pipe[j][1]);
|
|
}
|
|
|
|
if (i == TCP_SPLICE_PIPE_POOL_SIZE)
|
|
return;
|
|
|
|
if (!(c->tcp.pipe_size /= 2)) {
|
|
c->tcp.pipe_size = MAX_PIPE_SIZE;
|
|
return;
|
|
}
|
|
|
|
goto smaller;
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_pipe_refill() - Refill pool of pre-opened pipes
|
|
* @c: Execution context
|
|
*/
|
|
static void tcp_splice_pipe_refill(const struct ctx *c)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < TCP_SPLICE_PIPE_POOL_SIZE; i++) {
|
|
if (splice_pipe_pool[i][0] >= 0)
|
|
break;
|
|
if (pipe2(splice_pipe_pool[i], O_NONBLOCK | O_CLOEXEC))
|
|
continue;
|
|
|
|
if (fcntl(splice_pipe_pool[i][0], F_SETPIPE_SZ,
|
|
c->tcp.pipe_size) != (int)c->tcp.pipe_size) {
|
|
trace("TCP (spliced): cannot set pool pipe size to %zu",
|
|
c->tcp.pipe_size);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tcp_sock_refill_ns() - Refill pools of pre-opened sockets in namespace
|
|
* @arg: Execution context cast to void *
|
|
*
|
|
* Return: 0
|
|
*/
|
|
/* cppcheck-suppress [constParameterCallback, unmatchedSuppression] */
|
|
static int tcp_sock_refill_ns(void *arg)
|
|
{
|
|
const struct ctx *c = (const struct ctx *)arg;
|
|
|
|
ns_enter(c);
|
|
|
|
if (c->ifi4) {
|
|
int rc = tcp_sock_refill_pool(c, ns_sock_pool4, AF_INET);
|
|
if (rc < 0)
|
|
warn("TCP: Error refilling IPv4 ns socket pool: %s",
|
|
strerror(-rc));
|
|
}
|
|
if (c->ifi6) {
|
|
int rc = tcp_sock_refill_pool(c, ns_sock_pool6, AF_INET6);
|
|
if (rc < 0)
|
|
warn("TCP: Error refilling IPv6 ns socket pool: %s",
|
|
strerror(-rc));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_refill() - Refill pools of resources needed for splicing
|
|
* @c: Execution context
|
|
*/
|
|
void tcp_splice_refill(const struct ctx *c)
|
|
{
|
|
if ((c->ifi4 && ns_sock_pool4[TCP_SOCK_POOL_TSH] < 0) ||
|
|
(c->ifi6 && ns_sock_pool6[TCP_SOCK_POOL_TSH] < 0))
|
|
NS_CALL(tcp_sock_refill_ns, c);
|
|
|
|
tcp_splice_pipe_refill(c);
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_init() - Initialise pipe pool and size
|
|
* @c: Execution context
|
|
*/
|
|
void tcp_splice_init(struct ctx *c)
|
|
{
|
|
memset(splice_pipe_pool, 0xff, sizeof(splice_pipe_pool));
|
|
tcp_set_pipe_size(c);
|
|
|
|
memset(&ns_sock_pool4, 0xff, sizeof(ns_sock_pool4));
|
|
memset(&ns_sock_pool6, 0xff, sizeof(ns_sock_pool6));
|
|
NS_CALL(tcp_sock_refill_ns, c);
|
|
}
|
|
|
|
/**
|
|
* tcp_splice_timer() - Timer for spliced connections
|
|
* @c: Execution context
|
|
* @conn: Connection to handle
|
|
*/
|
|
void tcp_splice_timer(const struct ctx *c, struct tcp_splice_conn *conn)
|
|
{
|
|
unsigned sidei;
|
|
|
|
ASSERT(!(conn->flags & CLOSING));
|
|
|
|
flow_foreach_sidei(sidei) {
|
|
if ((conn->flags & RCVLOWAT_SET(sidei)) &&
|
|
!(conn->flags & RCVLOWAT_ACT(sidei))) {
|
|
if (setsockopt(conn->s[sidei], SOL_SOCKET, SO_RCVLOWAT,
|
|
&((int){ 1 }), sizeof(int))) {
|
|
flow_trace(conn, "can't set SO_RCVLOWAT on %d",
|
|
conn->s[sidei]);
|
|
}
|
|
conn_flag(c, conn, ~RCVLOWAT_SET(sidei));
|
|
}
|
|
}
|
|
|
|
flow_foreach_sidei(sidei)
|
|
conn_flag(c, conn, ~RCVLOWAT_ACT(sidei));
|
|
}
|