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net: L2TPv3 transport 

This transport allows to connect a QEMU nic to a static Ethernet
over L2TPv3 tunnel. The transport supports all options present
in the Linux kernel implementation. It allows QEMU to connect
to any Linux host running kernel 3.3+, most routers and network
devices as well as other QEMU instances.

[Fixed up net_client_init1() switch statement to support -netdev
--Stefan]

Signed-off-by: Anton Ivanov <antivano@cisco.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Anton Ivanov 2014-06-20 10:34:41 +01:00 committed by Stefan Hajnoczi
parent eb3f45c5af
commit 3fb69aa1d1
6 changed files with 908 additions and 0 deletions
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1
net/Makefile.objs
View File

@ -2,6 +2,7 @@ common-obj-y = net.o queue.o checksum.o util.o hub.o
common-obj-y += socket.o
common-obj-y += dump.o
common-obj-y += eth.o
common-obj-$(CONFIG_LINUX) += l2tpv3.o
common-obj-$(CONFIG_POSIX) += tap.o vhost-user.o
common-obj-$(CONFIG_LINUX) += tap-linux.o
common-obj-$(CONFIG_WIN32) += tap-win32.o

2
net/clients.h
View File

@ -47,6 +47,8 @@ int net_init_tap(const NetClientOptions *opts, const char *name,
int net_init_bridge(const NetClientOptions *opts, const char *name,
NetClientState *peer);
int net_init_l2tpv3(const NetClientOptions *opts, const char *name,
NetClientState *peer);
#ifdef CONFIG_VDE
int net_init_vde(const NetClientOptions *opts, const char *name,
NetClientState *peer);

757
net/l2tpv3.c Normal file
View File

@ -0,0 +1,757 @@
/*
* QEMU System Emulator
*
* Copyright (c) 2003-2008 Fabrice Bellard
* Copyright (c) 2012-2014 Cisco Systems
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <linux/ip.h>
#include <netdb.h>
#include "config-host.h"
#include "net/net.h"
#include "clients.h"
#include "monitor/monitor.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/sockets.h"
#include "qemu/iov.h"
#include "qemu/main-loop.h"
/* The buffer size needs to be investigated for optimum numbers and
* optimum means of paging in on different systems. This size is
* chosen to be sufficient to accommodate one packet with some headers
*/
#define BUFFER_ALIGN sysconf(_SC_PAGESIZE)
#define BUFFER_SIZE 2048
#define IOVSIZE 2
#define MAX_L2TPV3_MSGCNT 64
#define MAX_L2TPV3_IOVCNT (MAX_L2TPV3_MSGCNT * IOVSIZE)
/* Header set to 0x30000 signifies a data packet */
#define L2TPV3_DATA_PACKET 0x30000
/* IANA-assigned IP protocol ID for L2TPv3 */
#ifndef IPPROTO_L2TP
#define IPPROTO_L2TP 0x73
#endif
typedef struct NetL2TPV3State {
NetClientState nc;
int fd;
/*
* these are used for xmit - that happens packet a time
* and for first sign of life packet (easier to parse that once)
*/
uint8_t *header_buf;
struct iovec *vec;
/*
* these are used for receive - try to "eat" up to 32 packets at a time
*/
struct mmsghdr *msgvec;
/*
* peer address
*/
struct sockaddr_storage *dgram_dst;
uint32_t dst_size;
/*
* L2TPv3 parameters
*/
uint64_t rx_cookie;
uint64_t tx_cookie;
uint32_t rx_session;
uint32_t tx_session;
uint32_t header_size;
uint32_t counter;
/*
* DOS avoidance in error handling
*/
bool header_mismatch;
/*
* Ring buffer handling
*/
int queue_head;
int queue_tail;
int queue_depth;
/*
* Precomputed offsets
*/
uint32_t offset;
uint32_t cookie_offset;
uint32_t counter_offset;
uint32_t session_offset;
/* Poll Control */
bool read_poll;
bool write_poll;
/* Flags */
bool ipv6;
bool udp;
bool has_counter;
bool pin_counter;
bool cookie;
bool cookie_is_64;
} NetL2TPV3State;
static int l2tpv3_can_send(void *opaque);
static void net_l2tpv3_send(void *opaque);
static void l2tpv3_writable(void *opaque);
static void l2tpv3_update_fd_handler(NetL2TPV3State *s)
{
qemu_set_fd_handler2(s->fd,
s->read_poll ? l2tpv3_can_send : NULL,
s->read_poll ? net_l2tpv3_send : NULL,
s->write_poll ? l2tpv3_writable : NULL,
s);
}
static void l2tpv3_read_poll(NetL2TPV3State *s, bool enable)
{
if (s->read_poll != enable) {
s->read_poll = enable;
l2tpv3_update_fd_handler(s);
}
}
static void l2tpv3_write_poll(NetL2TPV3State *s, bool enable)
{
if (s->write_poll != enable) {
s->write_poll = enable;
l2tpv3_update_fd_handler(s);
}
}
static void l2tpv3_writable(void *opaque)
{
NetL2TPV3State *s = opaque;
l2tpv3_write_poll(s, false);
qemu_flush_queued_packets(&s->nc);
}
static int l2tpv3_can_send(void *opaque)
{
NetL2TPV3State *s = opaque;
return qemu_can_send_packet(&s->nc);
}
static void l2tpv3_send_completed(NetClientState *nc, ssize_t len)
{
NetL2TPV3State *s = DO_UPCAST(NetL2TPV3State, nc, nc);
l2tpv3_read_poll(s, true);
}
static void l2tpv3_poll(NetClientState *nc, bool enable)
{
NetL2TPV3State *s = DO_UPCAST(NetL2TPV3State, nc, nc);
l2tpv3_write_poll(s, enable);
l2tpv3_read_poll(s, enable);
}
static void l2tpv3_form_header(NetL2TPV3State *s)
{
uint32_t *counter;
if (s->udp) {
stl_be_p((uint32_t *) s->header_buf, L2TPV3_DATA_PACKET);
}
stl_be_p(
(uint32_t *) (s->header_buf + s->session_offset),
s->tx_session
);
if (s->cookie) {
if (s->cookie_is_64) {
stq_be_p(
(uint64_t *)(s->header_buf + s->cookie_offset),
s->tx_cookie
);
} else {
stl_be_p(
(uint32_t *) (s->header_buf + s->cookie_offset),
s->tx_cookie
);
}
}
if (s->has_counter) {
counter = (uint32_t *)(s->header_buf + s->counter_offset);
if (s->pin_counter) {
*counter = 0;
} else {
stl_be_p(counter, ++s->counter);
}
}
}
static ssize_t net_l2tpv3_receive_dgram_iov(NetClientState *nc,
const struct iovec *iov,
int iovcnt)
{
NetL2TPV3State *s = DO_UPCAST(NetL2TPV3State, nc, nc);
struct msghdr message;
int ret;
if (iovcnt > MAX_L2TPV3_IOVCNT - 1) {
error_report(
"iovec too long %d > %d, change l2tpv3.h",
iovcnt, MAX_L2TPV3_IOVCNT
);
return -1;
}
l2tpv3_form_header(s);
memcpy(s->vec + 1, iov, iovcnt * sizeof(struct iovec));
s->vec->iov_base = s->header_buf;
s->vec->iov_len = s->offset;
message.msg_name = s->dgram_dst;
message.msg_namelen = s->dst_size;
message.msg_iov = s->vec;
message.msg_iovlen = iovcnt + 1;
message.msg_control = NULL;
message.msg_controllen = 0;
message.msg_flags = 0;
do {
ret = sendmsg(s->fd, &message, 0);
} while ((ret == -1) && (errno == EINTR));
if (ret > 0) {
ret -= s->offset;
} else if (ret == 0) {
/* belt and braces - should not occur on DGRAM
* we should get an error and never a 0 send
*/
ret = iov_size(iov, iovcnt);
} else {
/* signal upper layer that socket buffer is full */
ret = -errno;
if (ret == -EAGAIN || ret == -ENOBUFS) {
l2tpv3_write_poll(s, true);
ret = 0;
}
}
return ret;
}
static ssize_t net_l2tpv3_receive_dgram(NetClientState *nc,
const uint8_t *buf,
size_t size)
{
NetL2TPV3State *s = DO_UPCAST(NetL2TPV3State, nc, nc);
struct iovec *vec;
struct msghdr message;
ssize_t ret = 0;
l2tpv3_form_header(s);
vec = s->vec;
vec->iov_base = s->header_buf;
vec->iov_len = s->offset;
vec++;
vec->iov_base = (void *) buf;
vec->iov_len = size;
message.msg_name = s->dgram_dst;
message.msg_namelen = s->dst_size;
message.msg_iov = s->vec;
message.msg_iovlen = 2;
message.msg_control = NULL;
message.msg_controllen = 0;
message.msg_flags = 0;
do {
ret = sendmsg(s->fd, &message, 0);
} while ((ret == -1) && (errno == EINTR));
if (ret > 0) {
ret -= s->offset;
} else if (ret == 0) {
/* belt and braces - should not occur on DGRAM
* we should get an error and never a 0 send
*/
ret = size;
} else {
ret = -errno;
if (ret == -EAGAIN || ret == -ENOBUFS) {
/* signal upper layer that socket buffer is full */
l2tpv3_write_poll(s, true);
ret = 0;
}
}
return ret;
}
static int l2tpv3_verify_header(NetL2TPV3State *s, uint8_t *buf)
{
uint32_t *session;
uint64_t cookie;
if ((!s->udp) && (!s->ipv6)) {
buf += sizeof(struct iphdr) /* fix for ipv4 raw */;
}
/* we do not do a strict check for "data" packets as per
* the RFC spec because the pure IP spec does not have
* that anyway.
*/
if (s->cookie) {
if (s->cookie_is_64) {
cookie = ldq_be_p(buf + s->cookie_offset);
} else {
cookie = ldl_be_p(buf + s->cookie_offset);
}
if (cookie != s->rx_cookie) {
if (!s->header_mismatch) {
error_report("unknown cookie id");
}
return -1;
}
}
session = (uint32_t *) (buf + s->session_offset);
if (ldl_be_p(session) != s->rx_session) {
if (!s->header_mismatch) {
error_report("session mismatch");
}
return -1;
}
return 0;
}
static void net_l2tpv3_process_queue(NetL2TPV3State *s)
{
int size = 0;
struct iovec *vec;
bool bad_read;
int data_size;
struct mmsghdr *msgvec;
/* go into ring mode only if there is a "pending" tail */
if (s->queue_depth > 0) {
do {
msgvec = s->msgvec + s->queue_tail;
if (msgvec->msg_len > 0) {
data_size = msgvec->msg_len - s->header_size;
vec = msgvec->msg_hdr.msg_iov;
if ((data_size > 0) &&
(l2tpv3_verify_header(s, vec->iov_base) == 0)) {
vec++;
/* Use the legacy delivery for now, we will
* switch to using our own ring as a queueing mechanism
* at a later date
*/
size = qemu_send_packet_async(
&s->nc,
vec->iov_base,
data_size,
l2tpv3_send_completed
);
if (size == 0) {
l2tpv3_read_poll(s, false);
}
bad_read = false;
} else {
bad_read = true;
if (!s->header_mismatch) {
/* report error only once */
error_report("l2tpv3 header verification failed");
s->header_mismatch = true;
}
}
} else {
bad_read = true;
}
s->queue_tail = (s->queue_tail + 1) % MAX_L2TPV3_MSGCNT;
s->queue_depth--;
} while (
(s->queue_depth > 0) &&
qemu_can_send_packet(&s->nc) &&
((size > 0) || bad_read)
);
}
}
static void net_l2tpv3_send(void *opaque)
{
NetL2TPV3State *s = opaque;
int target_count, count;
struct mmsghdr *msgvec;
/* go into ring mode only if there is a "pending" tail */
if (s->queue_depth) {
/* The ring buffer we use has variable intake
* count of how much we can read varies - adjust accordingly
*/
target_count = MAX_L2TPV3_MSGCNT - s->queue_depth;
/* Ensure we do not overrun the ring when we have
* a lot of enqueued packets
*/
if (s->queue_head + target_count > MAX_L2TPV3_MSGCNT) {
target_count = MAX_L2TPV3_MSGCNT - s->queue_head;
}
} else {
/* we do not have any pending packets - we can use
* the whole message vector linearly instead of using
* it as a ring
*/
s->queue_head = 0;
s->queue_tail = 0;
target_count = MAX_L2TPV3_MSGCNT;
}
msgvec = s->msgvec + s->queue_head;
if (target_count > 0) {
do {
count = recvmmsg(
s->fd,
msgvec,
target_count, MSG_DONTWAIT, NULL);
} while ((count == -1) && (errno == EINTR));
if (count < 0) {
/* Recv error - we still need to flush packets here,
* (re)set queue head to current position
*/
count = 0;
}
s->queue_head = (s->queue_head + count) % MAX_L2TPV3_MSGCNT;
s->queue_depth += count;
}
net_l2tpv3_process_queue(s);
}
static void destroy_vector(struct mmsghdr *msgvec, int count, int iovcount)
{
int i, j;
struct iovec *iov;
struct mmsghdr *cleanup = msgvec;
if (cleanup) {
for (i = 0; i < count; i++) {
if (cleanup->msg_hdr.msg_iov) {
iov = cleanup->msg_hdr.msg_iov;
for (j = 0; j < iovcount; j++) {
g_free(iov->iov_base);
iov++;
}
g_free(cleanup->msg_hdr.msg_iov);
}
cleanup++;
}
g_free(msgvec);
}
}
static struct mmsghdr *build_l2tpv3_vector(NetL2TPV3State *s, int count)
{
int i;
struct iovec *iov;
struct mmsghdr *msgvec, *result;
msgvec = g_malloc(sizeof(struct mmsghdr) * count);
result = msgvec;
for (i = 0; i < count ; i++) {
msgvec->msg_hdr.msg_name = NULL;
msgvec->msg_hdr.msg_namelen = 0;
iov = g_malloc(sizeof(struct iovec) * IOVSIZE);
msgvec->msg_hdr.msg_iov = iov;
iov->iov_base = g_malloc(s->header_size);
iov->iov_len = s->header_size;
iov++ ;
iov->iov_base = qemu_memalign(BUFFER_ALIGN, BUFFER_SIZE);
iov->iov_len = BUFFER_SIZE;
msgvec->msg_hdr.msg_iovlen = 2;
msgvec->msg_hdr.msg_control = NULL;
msgvec->msg_hdr.msg_controllen = 0;
msgvec->msg_hdr.msg_flags = 0;
msgvec++;
}
return result;
}
static void net_l2tpv3_cleanup(NetClientState *nc)
{
NetL2TPV3State *s = DO_UPCAST(NetL2TPV3State, nc, nc);
qemu_purge_queued_packets(nc);
l2tpv3_read_poll(s, false);
l2tpv3_write_poll(s, false);
if (s->fd > 0) {
close(s->fd);
}
destroy_vector(s->msgvec, MAX_L2TPV3_MSGCNT, IOVSIZE);
g_free(s->vec);
g_free(s->header_buf);
g_free(s->dgram_dst);
}
static NetClientInfo net_l2tpv3_info = {
.type = NET_CLIENT_OPTIONS_KIND_L2TPV3,
.size = sizeof(NetL2TPV3State),
.receive = net_l2tpv3_receive_dgram,
.receive_iov = net_l2tpv3_receive_dgram_iov,
.poll = l2tpv3_poll,
.cleanup = net_l2tpv3_cleanup,
};
int net_init_l2tpv3(const NetClientOptions *opts,
const char *name,
NetClientState *peer)
{
const NetdevL2TPv3Options *l2tpv3;
NetL2TPV3State *s;
NetClientState *nc;
int fd = -1, gairet;
struct addrinfo hints;
struct addrinfo *result = NULL;
char *srcport, *dstport;
nc = qemu_new_net_client(&net_l2tpv3_info, peer, "l2tpv3", name);
s = DO_UPCAST(NetL2TPV3State, nc, nc);
s->queue_head = 0;
s->queue_tail = 0;
s->header_mismatch = false;
assert(opts->kind == NET_CLIENT_OPTIONS_KIND_L2TPV3);
l2tpv3 = opts->l2tpv3;
if (l2tpv3->has_ipv6 && l2tpv3->ipv6) {
s->ipv6 = l2tpv3->ipv6;
} else {
s->ipv6 = false;
}
if ((l2tpv3->has_offset) && (l2tpv3->offset > 256)) {
error_report("l2tpv3_open : offset must be less than 256 bytes");
goto outerr;
}
if (l2tpv3->has_rxcookie || l2tpv3->has_txcookie) {
if (l2tpv3->has_rxcookie && l2tpv3->has_txcookie) {
s->cookie = true;
} else {
goto outerr;
}
} else {
s->cookie = false;
}
if (l2tpv3->has_cookie64 || l2tpv3->cookie64) {
s->cookie_is_64 = true;
} else {
s->cookie_is_64 = false;
}
if (l2tpv3->has_udp && l2tpv3->udp) {
s->udp = true;
if (!(l2tpv3->has_srcport && l2tpv3->has_dstport)) {
error_report("l2tpv3_open : need both src and dst port for udp");
goto outerr;
} else {
srcport = l2tpv3->srcport;
dstport = l2tpv3->dstport;
}
} else {
s->udp = false;
srcport = NULL;
dstport = NULL;
}
s->offset = 4;
s->session_offset = 0;
s->cookie_offset = 4;
s->counter_offset = 4;
s->tx_session = l2tpv3->txsession;
if (l2tpv3->has_rxsession) {
s->rx_session = l2tpv3->rxsession;
} else {
s->rx_session = s->tx_session;
}
if (s->cookie) {
s->rx_cookie = l2tpv3->rxcookie;
s->tx_cookie = l2tpv3->txcookie;
if (s->cookie_is_64 == true) {
/* 64 bit cookie */
s->offset += 8;
s->counter_offset += 8;
} else {
/* 32 bit cookie */
s->offset += 4;
s->counter_offset += 4;
}
}
memset(&hints, 0, sizeof(hints));
if (s->ipv6) {
hints.ai_family = AF_INET6;
} else {
hints.ai_family = AF_INET;
}
if (s->udp) {
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = 0;
s->offset += 4;
s->counter_offset += 4;
s->session_offset += 4;
s->cookie_offset += 4;
} else {
hints.ai_socktype = SOCK_RAW;
hints.ai_protocol = IPPROTO_L2TP;
}
gairet = getaddrinfo(l2tpv3->src, srcport, &hints, &result);
if ((gairet != 0) || (result == NULL)) {
error_report(
"l2tpv3_open : could not resolve src, errno = %s",
gai_strerror(gairet)
);
goto outerr;
}
fd = socket(result->ai_family, result->ai_socktype, result->ai_protocol);
if (fd == -1) {
fd = -errno;
error_report("l2tpv3_open : socket creation failed, errno = %d", -fd);
freeaddrinfo(result);
goto outerr;
}
if (bind(fd, (struct sockaddr *) result->ai_addr, result->ai_addrlen)) {
error_report("l2tpv3_open : could not bind socket err=%i", errno);
goto outerr;
}
if (result) {
freeaddrinfo(result);
}
memset(&hints, 0, sizeof(hints));
if (s->ipv6) {
hints.ai_family = AF_INET6;
} else {
hints.ai_family = AF_INET;
}
if (s->udp) {
hints.ai_socktype = SOCK_DGRAM;
hints.ai_protocol = 0;
} else {
hints.ai_socktype = SOCK_RAW;
hints.ai_protocol = IPPROTO_L2TP;
}
result = NULL;
gairet = getaddrinfo(l2tpv3->dst, dstport, &hints, &result);
if ((gairet != 0) || (result == NULL)) {
error_report(
"l2tpv3_open : could not resolve dst, error = %s",
gai_strerror(gairet)
);
goto outerr;
}
s->dgram_dst = g_malloc(sizeof(struct sockaddr_storage));
memset(s->dgram_dst, '\0' , sizeof(struct sockaddr_storage));
memcpy(s->dgram_dst, result->ai_addr, result->ai_addrlen);
s->dst_size = result->ai_addrlen;
if (result) {
freeaddrinfo(result);
}
if (l2tpv3->has_counter && l2tpv3->counter) {
s->has_counter = true;
s->offset += 4;
} else {
s->has_counter = false;
}
if (l2tpv3->has_pincounter && l2tpv3->pincounter) {
s->has_counter = true; /* pin counter implies that there is counter */
s->pin_counter = true;
} else {
s->pin_counter = false;
}
if (l2tpv3->has_offset) {
/* extra offset */
s->offset += l2tpv3->offset;
}
if ((s->ipv6) || (s->udp)) {
s->header_size = s->offset;
} else {
s->header_size = s->offset + sizeof(struct iphdr);
}
s->msgvec = build_l2tpv3_vector(s, MAX_L2TPV3_MSGCNT);
s->vec = g_malloc(sizeof(struct iovec) * MAX_L2TPV3_IOVCNT);
s->header_buf = g_malloc(s->header_size);
qemu_set_nonblock(fd);
s->fd = fd;
s->counter = 0;
l2tpv3_read_poll(s, true);
snprintf(s->nc.info_str, sizeof(s->nc.info_str),
"l2tpv3: connected");
return 0;
outerr:
qemu_del_net_client(nc);
if (fd > 0) {
close(fd);
}
if (result) {
freeaddrinfo(result);
}
return -1;
}

6
net/net.c
View File

@ -806,6 +806,9 @@ static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
#ifdef CONFIG_VHOST_NET_USED
[NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
#endif
#ifdef CONFIG_LINUX
[NET_CLIENT_OPTIONS_KIND_L2TPV3] = net_init_l2tpv3,
#endif
};
@ -841,6 +844,9 @@ static int net_client_init1(const void *object, int is_netdev, Error **errp)
case NET_CLIENT_OPTIONS_KIND_HUBPORT:
#ifdef CONFIG_VHOST_NET_USED
case NET_CLIENT_OPTIONS_KIND_VHOST_USER:
#endif
#ifdef CONFIG_LINUX
case NET_CLIENT_OPTIONS_KIND_L2TPV3:
#endif
break;

60
qapi-schema.json
View File

@ -2039,6 +2039,62 @@
'*localaddr': 'str',
'*udp': 'str' } }
##
# @NetdevL2TPv3Options
#
# Connect the VLAN to Ethernet over L2TPv3 Static tunnel
#
# @src: source address
#
# @dst: destination address
#
# @srcport: #optional source port - mandatory for udp, optional for ip
#
# @dstport: #optional destination port - mandatory for udp, optional for ip
#
# @ipv6: #optional - force the use of ipv6
#
# @udp: #optional - use the udp version of l2tpv3 encapsulation
#
# @cookie64: #optional - use 64 bit coookies
#
# @counter: #optional have sequence counter
#
# @pincounter: #optional pin sequence counter to zero -
# workaround for buggy implementations or
# networks with packet reorder
#
# @txcookie: #optional 32 or 64 bit transmit cookie
#
# @rxcookie: #optional 32 or 64 bit receive cookie
#
# @txsession: 32 bit transmit session
#
# @rxsession: #optional 32 bit receive session - if not specified
# set to the same value as transmit
#
# @offset: #optional additional offset - allows the insertion of
# additional application-specific data before the packet payload
#
# Since 2.1
##
{ 'type': 'NetdevL2TPv3Options',
'data': {
'src': 'str',
'dst': 'str',
'*srcport': 'str',
'*dstport': 'str',
'*ipv6': 'bool',
'*udp': 'bool',
'*cookie64': 'bool',
'*counter': 'bool',
'*pincounter': 'bool',
'*txcookie': 'uint64',
'*rxcookie': 'uint64',
'txsession': 'uint32',
'*rxsession': 'uint32',
'*offset': 'uint32' } }
##
# @NetdevVdeOptions
#
@ -2150,6 +2206,9 @@
# A discriminated record of network device traits.
#
# Since 1.2
#
# 'l2tpv3' - since 2.1
#
##
{ 'union': 'NetClientOptions',
'data': {
@ -2157,6 +2216,7 @@
'nic': 'NetLegacyNicOptions',
'user': 'NetdevUserOptions',
'tap': 'NetdevTapOptions',
'l2tpv3': 'NetdevL2TPv3Options',
'socket': 'NetdevSocketOptions',
'vde': 'NetdevVdeOptions',
'dump': 'NetdevDumpOptions',

82
qemu-options.hx
View File

@ -1432,6 +1432,29 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
" connects a host TAP network interface to a host bridge device 'br'\n"
" (default=" DEFAULT_BRIDGE_INTERFACE ") using the program 'helper'\n"
" (default=" DEFAULT_BRIDGE_HELPER ")\n"
#endif
#ifdef __linux__
"-net l2tpv3[,vlan=n][,name=str],src=srcaddr,dst=dstaddr[,srcport=srcport][,dstport=dstport],txsession=txsession[,rxsession=rxsession][,ipv6=on/off][,udp=on/off][,cookie64=on/off][,counter][,pincounter][,txcookie=txcookie][,rxcookie=rxcookie][,offset=offset]\n"
" connect the VLAN to an Ethernet over L2TPv3 pseudowire\n"
" Linux kernel 3.3+ as well as most routers can talk\n"
" L2TPv3. This transport allows to connect a VM to a VM,\n"
" VM to a router and even VM to Host. It is a nearly-universal\n"
" standard (RFC3391). Note - this implementation uses static\n"
" pre-configured tunnels (same as the Linux kernel).\n"
" use 'src=' to specify source address\n"
" use 'dst=' to specify destination address\n"
" use 'udp=on' to specify udp encapsulation\n"
" use 'dstport=' to specify destination udp port\n"
" use 'dstport=' to specify destination udp port\n"
" use 'ipv6=on' to force v6\n"
" L2TPv3 uses cookies to prevent misconfiguration as\n"
" well as a weak security measure\n"
" use 'rxcookie=0x012345678' to specify a rxcookie\n"
" use 'txcookie=0x012345678' to specify a txcookie\n"
" use 'cookie64=on' to set cookie size to 64 bit, otherwise 32\n"
" use 'counter=off' to force a 'cut-down' L2TPv3 with no counter\n"
" use 'pincounter=on' to work around broken counter handling in peer\n"
" use 'offset=X' to add an extra offset between header and data\n"
#endif
"-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]\n"
" connect the vlan 'n' to another VLAN using a socket connection\n"
@ -1778,6 +1801,65 @@ qemu-system-i386 linux.img \
-net socket,mcast=239.192.168.1:1102,localaddr=1.2.3.4
@end example
@item -netdev l2tpv3,id=@var{id},src=@var{srcaddr},dst=@var{dstaddr}[,srcport=@var{srcport}][,dstport=@var{dstport}],txsession=@var{txsession}[,rxsession=@var{rxsession}][,ipv6][,udp][,cookie64][,counter][,pincounter][,txcookie=@var{txcookie}][,rxcookie=@var{rxcookie}][,offset=@var{offset}]
@item -net l2tpv3[,vlan=@var{n}][,name=@var{name}],src=@var{srcaddr},dst=@var{dstaddr}[,srcport=@var{srcport}][,dstport=@var{dstport}],txsession=@var{txsession}[,rxsession=@var{rxsession}][,ipv6][,udp][,cookie64][,counter][,pincounter][,txcookie=@var{txcookie}][,rxcookie=@var{rxcookie}][,offset=@var{offset}]
Connect VLAN @var{n} to L2TPv3 pseudowire. L2TPv3 (RFC3391) is a popular
protocol to transport Ethernet (and other Layer 2) data frames between
two systems. It is present in routers, firewalls and the Linux kernel
(from version 3.3 onwards).
This transport allows a VM to communicate to another VM, router or firewall directly.
@item src=@var{srcaddr}
source address (mandatory)
@item dst=@var{dstaddr}
destination address (mandatory)
@item udp
select udp encapsulation (default is ip).
@item srcport=@var{srcport}
source udp port.
@item dstport=@var{dstport}
destination udp port.
@item ipv6
force v6, otherwise defaults to v4.
@item rxcookie=@var{rxcookie}
@item txcookie=@var{txcookie}
Cookies are a weak form of security in the l2tpv3 specification.
Their function is mostly to prevent misconfiguration. By default they are 32
bit.
@item cookie64
Set cookie size to 64 bit instead of the default 32
@item counter=off
Force a 'cut-down' L2TPv3 with no counter as in
draft-mkonstan-l2tpext-keyed-ipv6-tunnel-00
@item pincounter=on
Work around broken counter handling in peer. This may also help on
networks which have packet reorder.
@item offset=@var{offset}
Add an extra offset between header and data
For example, to attach a VM running on host 4.3.2.1 via L2TPv3 to the bridge br-lan
on the remote Linux host 1.2.3.4:
@example
# Setup tunnel on linux host using raw ip as encapsulation
# on 1.2.3.4
ip l2tp add tunnel remote 4.3.2.1 local 1.2.3.4 tunnel_id 1 peer_tunnel_id 1 \
encap udp udp_sport 16384 udp_dport 16384
ip l2tp add session tunnel_id 1 name vmtunnel0 session_id \
0xFFFFFFFF peer_session_id 0xFFFFFFFF
ifconfig vmtunnel0 mtu 1500
ifconfig vmtunnel0 up
brctl addif br-lan vmtunnel0
# on 4.3.2.1
# launch QEMU instance - if your network has reorder or is very lossy add ,pincounter
qemu-system-i386 linux.img -net nic -net l2tpv3,src=4.2.3.1,dst=1.2.3.4,udp,srcport=16384,dstport=16384,rxsession=0xffffffff,txsession=0xffffffff,counter
@end example
@item -netdev vde,id=@var{id}[,sock=@var{socketpath}][,port=@var{n}][,group=@var{groupname}][,mode=@var{octalmode}]
@item -net vde[,vlan=@var{n}][,name=@var{name}][,sock=@var{socketpath}] [,port=@var{n}][,group=@var{groupname}][,mode=@var{octalmode}]
Connect VLAN @var{n} to PORT @var{n} of a vde switch running on host and