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qemu-e2k/slirp/slirp.c
Stefan Hajnoczi 8917c3bdba slirp: switch to GPollFD 
Slirp uses rfds/wfds/xfds more extensively than other QEMU components.

The rarely-used out-of-band TCP data feature is used.  That means we
need the full table of select(2) to g_poll(3) events:

  rfds -> G_IO_IN | G_IO_HUP | G_IO_ERR
  wfds -> G_IO_OUT | G_IO_ERR
  xfds -> G_IO_PRI

I came up with this table by looking at Linux fs/select.c which maps
select(2) to poll(2) internally.

Another detail to watch out for are the global variables that reference
rfds/wfds/xfds during slirp_select_poll().  sofcantrcvmore() and
sofcantsendmore() use these globals to clear fd_set bits.  When
sofcantrcvmore() is called, the wfds bit is cleared so that the write
handler will no longer be run for this iteration of the event loop.

This actually seems buggy to me since TCP connections can be half-closed
and we'd still want to handle data in half-duplex fashion.  I think the
real intention is to avoid running the read/write handler when the
socket has been fully closed.  This is indicated with the SS_NOFDREF
state bit so we now check for it before invoking the TCP write handler.
Note that UDP/ICMP code paths don't care because they are
connectionless.

Note that slirp/ has a lot of tabs and sometimes mixed tabs with spaces.
I followed the style of the surrounding code.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-id: 1361356113-11049-6-git-send-email-stefanha@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-02-21 16:17:31 -06:00

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/*
* libslirp glue
*
* Copyright (c) 2004-2008 Fabrice Bellard
*
* 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 "qemu-common.h"
#include "qemu/timer.h"
#include "char/char.h"
#include "slirp.h"
#include "hw/hw.h"
/* host loopback address */
struct in_addr loopback_addr;
/* host loopback network mask */
unsigned long loopback_mask;
/* emulated hosts use the MAC addr 52:55:IP:IP:IP:IP */
static const uint8_t special_ethaddr[ETH_ALEN] = {
0x52, 0x55, 0x00, 0x00, 0x00, 0x00
};
static const uint8_t zero_ethaddr[ETH_ALEN] = { 0, 0, 0, 0, 0, 0 };
u_int curtime;
static u_int time_fasttimo, last_slowtimo;
static int do_slowtimo;
static QTAILQ_HEAD(slirp_instances, Slirp) slirp_instances =
QTAILQ_HEAD_INITIALIZER(slirp_instances);
static struct in_addr dns_addr;
static u_int dns_addr_time;
#ifdef _WIN32
int get_dns_addr(struct in_addr *pdns_addr)
{
FIXED_INFO *FixedInfo=NULL;
ULONG BufLen;
DWORD ret;
IP_ADDR_STRING *pIPAddr;
struct in_addr tmp_addr;
if (dns_addr.s_addr != 0 && (curtime - dns_addr_time) < 1000) {
*pdns_addr = dns_addr;
return 0;
}
FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
BufLen = sizeof(FIXED_INFO);
if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
if (FixedInfo) {
GlobalFree(FixedInfo);
FixedInfo = NULL;
}
FixedInfo = GlobalAlloc(GPTR, BufLen);
}
if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
if (FixedInfo) {
GlobalFree(FixedInfo);
FixedInfo = NULL;
}
return -1;
}
pIPAddr = &(FixedInfo->DnsServerList);
inet_aton(pIPAddr->IpAddress.String, &tmp_addr);
*pdns_addr = tmp_addr;
dns_addr = tmp_addr;
dns_addr_time = curtime;
if (FixedInfo) {
GlobalFree(FixedInfo);
FixedInfo = NULL;
}
return 0;
}
static void winsock_cleanup(void)
{
WSACleanup();
}
#else
static struct stat dns_addr_stat;
int get_dns_addr(struct in_addr *pdns_addr)
{
char buff[512];
char buff2[257];
FILE *f;
int found = 0;
struct in_addr tmp_addr;
if (dns_addr.s_addr != 0) {
struct stat old_stat;
if ((curtime - dns_addr_time) < 1000) {
*pdns_addr = dns_addr;
return 0;
}
old_stat = dns_addr_stat;
if (stat("/etc/resolv.conf", &dns_addr_stat) != 0)
return -1;
if ((dns_addr_stat.st_dev == old_stat.st_dev)
&& (dns_addr_stat.st_ino == old_stat.st_ino)
&& (dns_addr_stat.st_size == old_stat.st_size)
&& (dns_addr_stat.st_mtime == old_stat.st_mtime)) {
*pdns_addr = dns_addr;
return 0;
}
}
f = fopen("/etc/resolv.conf", "r");
if (!f)
return -1;
#ifdef DEBUG
lprint("IP address of your DNS(s): ");
#endif
while (fgets(buff, 512, f) != NULL) {
if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
if (!inet_aton(buff2, &tmp_addr))
continue;
/* If it's the first one, set it to dns_addr */
if (!found) {
*pdns_addr = tmp_addr;
dns_addr = tmp_addr;
dns_addr_time = curtime;
}
#ifdef DEBUG
else
lprint(", ");
#endif
if (++found > 3) {
#ifdef DEBUG
lprint("(more)");
#endif
break;
}
#ifdef DEBUG
else
lprint("%s", inet_ntoa(tmp_addr));
#endif
}
}
fclose(f);
if (!found)
return -1;
return 0;
}
#endif
static void slirp_init_once(void)
{
static int initialized;
#ifdef _WIN32
WSADATA Data;
#endif
if (initialized) {
return;
}
initialized = 1;
#ifdef _WIN32
WSAStartup(MAKEWORD(2,0), &Data);
atexit(winsock_cleanup);
#endif
loopback_addr.s_addr = htonl(INADDR_LOOPBACK);
loopback_mask = htonl(IN_CLASSA_NET);
}
static void slirp_state_save(QEMUFile *f, void *opaque);
static int slirp_state_load(QEMUFile *f, void *opaque, int version_id);
Slirp *slirp_init(int restricted, struct in_addr vnetwork,
struct in_addr vnetmask, struct in_addr vhost,
const char *vhostname, const char *tftp_path,
const char *bootfile, struct in_addr vdhcp_start,
struct in_addr vnameserver, const char **vdnssearch,
void *opaque)
{
Slirp *slirp = g_malloc0(sizeof(Slirp));
slirp_init_once();
slirp->restricted = restricted;
if_init(slirp);
ip_init(slirp);
/* Initialise mbufs *after* setting the MTU */
m_init(slirp);
slirp->vnetwork_addr = vnetwork;
slirp->vnetwork_mask = vnetmask;
slirp->vhost_addr = vhost;
if (vhostname) {
pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname),
vhostname);
}
slirp->tftp_prefix = g_strdup(tftp_path);
slirp->bootp_filename = g_strdup(bootfile);
slirp->vdhcp_startaddr = vdhcp_start;
slirp->vnameserver_addr = vnameserver;
if (vdnssearch) {
translate_dnssearch(slirp, vdnssearch);
}
slirp->opaque = opaque;
register_savevm(NULL, "slirp", 0, 3,
slirp_state_save, slirp_state_load, slirp);
QTAILQ_INSERT_TAIL(&slirp_instances, slirp, entry);
return slirp;
}
void slirp_cleanup(Slirp *slirp)
{
QTAILQ_REMOVE(&slirp_instances, slirp, entry);
unregister_savevm(NULL, "slirp", slirp);
ip_cleanup(slirp);
m_cleanup(slirp);
g_free(slirp->vdnssearch);
g_free(slirp->tftp_prefix);
g_free(slirp->bootp_filename);
g_free(slirp);
}
#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
void slirp_update_timeout(uint32_t *timeout)
{
if (!QTAILQ_EMPTY(&slirp_instances)) {
*timeout = MIN(1000, *timeout);
}
}
void slirp_pollfds_fill(GArray *pollfds)
{
Slirp *slirp;
struct socket *so, *so_next;
if (QTAILQ_EMPTY(&slirp_instances)) {
return;
}
/*
* First, TCP sockets
*/
do_slowtimo = 0;
QTAILQ_FOREACH(slirp, &slirp_instances, entry) {
/*
* *_slowtimo needs calling if there are IP fragments
* in the fragment queue, or there are TCP connections active
*/
do_slowtimo |= ((slirp->tcb.so_next != &slirp->tcb) ||
(&slirp->ipq.ip_link != slirp->ipq.ip_link.next));
for (so = slirp->tcb.so_next; so != &slirp->tcb;
so = so_next) {
int events = 0;
so_next = so->so_next;
so->pollfds_idx = -1;
/*
* See if we need a tcp_fasttimo
*/
if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK) {
time_fasttimo = curtime; /* Flag when we want a fasttimo */
}
/*
* NOFDREF can include still connecting to local-host,
* newly socreated() sockets etc. Don't want to select these.
*/
if (so->so_state & SS_NOFDREF || so->s == -1) {
continue;
}
/*
* Set for reading sockets which are accepting
*/
if (so->so_state & SS_FACCEPTCONN) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_IN | G_IO_HUP | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
continue;
}
/*
* Set for writing sockets which are connecting
*/
if (so->so_state & SS_ISFCONNECTING) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_OUT | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
continue;
}
/*
* Set for writing if we are connected, can send more, and
* we have something to send
*/
if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
events |= G_IO_OUT | G_IO_ERR;
}
/*
* Set for reading (and urgent data) if we are connected, can
* receive more, and we have room for it XXX /2 ?
*/
if (CONN_CANFRCV(so) &&
(so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) {
events |= G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_PRI;
}
if (events) {
GPollFD pfd = {
.fd = so->s,
.events = events,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
}
}
/*
* UDP sockets
*/
for (so = slirp->udb.so_next; so != &slirp->udb;
so = so_next) {
so_next = so->so_next;
so->pollfds_idx = -1;
/*
* See if it's timed out
*/
if (so->so_expire) {
if (so->so_expire <= curtime) {
udp_detach(so);
continue;
} else {
do_slowtimo = 1; /* Let socket expire */
}
}
/*
* When UDP packets are received from over the
* link, they're sendto()'d straight away, so
* no need for setting for writing
* Limit the number of packets queued by this session
* to 4. Note that even though we try and limit this
* to 4 packets, the session could have more queued
* if the packets needed to be fragmented
* (XXX <= 4 ?)
*/
if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_IN | G_IO_HUP | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
}
}
/*
* ICMP sockets
*/
for (so = slirp->icmp.so_next; so != &slirp->icmp;
so = so_next) {
so_next = so->so_next;
so->pollfds_idx = -1;
/*
* See if it's timed out
*/
if (so->so_expire) {
if (so->so_expire <= curtime) {
icmp_detach(so);
continue;
} else {
do_slowtimo = 1; /* Let socket expire */
}
}
if (so->so_state & SS_ISFCONNECTED) {
GPollFD pfd = {
.fd = so->s,
.events = G_IO_IN | G_IO_HUP | G_IO_ERR,
};
so->pollfds_idx = pollfds->len;
g_array_append_val(pollfds, pfd);
}
}
}
}
void slirp_pollfds_poll(GArray *pollfds, int select_error)
{
Slirp *slirp;
struct socket *so, *so_next;
int ret;
if (QTAILQ_EMPTY(&slirp_instances)) {
return;
}
curtime = qemu_get_clock_ms(rt_clock);
QTAILQ_FOREACH(slirp, &slirp_instances, entry) {
/*
* See if anything has timed out
*/
if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) {
tcp_fasttimo(slirp);
time_fasttimo = 0;
}
if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) {
ip_slowtimo(slirp);
tcp_slowtimo(slirp);
last_slowtimo = curtime;
}
/*
* Check sockets
*/
if (!select_error) {
/*
* Check TCP sockets
*/
for (so = slirp->tcb.so_next; so != &slirp->tcb;
so = so_next) {
int revents;
so_next = so->so_next;
revents = 0;
if (so->pollfds_idx != -1) {
revents = g_array_index(pollfds, GPollFD,
so->pollfds_idx).revents;
}
if (so->so_state & SS_NOFDREF || so->s == -1) {
continue;
}
/*
* Check for URG data
* This will soread as well, so no need to
* test for G_IO_IN below if this succeeds
*/
if (revents & G_IO_PRI) {
sorecvoob(so);
}
/*
* Check sockets for reading
*/
else if (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR)) {
/*
* Check for incoming connections
*/
if (so->so_state & SS_FACCEPTCONN) {
tcp_connect(so);
continue;
} /* else */
ret = soread(so);
/* Output it if we read something */
if (ret > 0) {
tcp_output(sototcpcb(so));
}
}
/*
* Check sockets for writing
*/
if (!(so->so_state & SS_NOFDREF) &&
(revents & (G_IO_OUT | G_IO_ERR))) {
/*
* Check for non-blocking, still-connecting sockets
*/
if (so->so_state & SS_ISFCONNECTING) {
/* Connected */
so->so_state &= ~SS_ISFCONNECTING;
ret = send(so->s, (const void *) &ret, 0, 0);
if (ret < 0) {
/* XXXXX Must fix, zero bytes is a NOP */
if (errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINPROGRESS || errno == ENOTCONN) {
continue;
}
/* else failed */
so->so_state &= SS_PERSISTENT_MASK;
so->so_state |= SS_NOFDREF;
}
/* else so->so_state &= ~SS_ISFCONNECTING; */
/*
* Continue tcp_input
*/
tcp_input((struct mbuf *)NULL, sizeof(struct ip), so);
/* continue; */
} else {
ret = sowrite(so);
}
/*
* XXXXX If we wrote something (a lot), there
* could be a need for a window update.
* In the worst case, the remote will send
* a window probe to get things going again
*/
}
/*
* Probe a still-connecting, non-blocking socket
* to check if it's still alive
*/
#ifdef PROBE_CONN
if (so->so_state & SS_ISFCONNECTING) {
ret = qemu_recv(so->s, &ret, 0, 0);
if (ret < 0) {
/* XXX */
if (errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINPROGRESS || errno == ENOTCONN) {
continue; /* Still connecting, continue */
}
/* else failed */
so->so_state &= SS_PERSISTENT_MASK;
so->so_state |= SS_NOFDREF;
/* tcp_input will take care of it */
} else {
ret = send(so->s, &ret, 0, 0);
if (ret < 0) {
/* XXX */
if (errno == EAGAIN || errno == EWOULDBLOCK ||
errno == EINPROGRESS || errno == ENOTCONN) {
continue;
}
/* else failed */
so->so_state &= SS_PERSISTENT_MASK;
so->so_state |= SS_NOFDREF;
} else {
so->so_state &= ~SS_ISFCONNECTING;
}
}
tcp_input((struct mbuf *)NULL, sizeof(struct ip), so);
} /* SS_ISFCONNECTING */
#endif
}
/*
* Now UDP sockets.
* Incoming packets are sent straight away, they're not buffered.
* Incoming UDP data isn't buffered either.
*/
for (so = slirp->udb.so_next; so != &slirp->udb;
so = so_next) {
int revents;
so_next = so->so_next;
revents = 0;
if (so->pollfds_idx != -1) {
revents = g_array_index(pollfds, GPollFD,
so->pollfds_idx).revents;
}
if (so->s != -1 &&
(revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) {
sorecvfrom(so);
}
}
/*
* Check incoming ICMP relies.
*/
for (so = slirp->icmp.so_next; so != &slirp->icmp;
so = so_next) {
int revents;
so_next = so->so_next;
revents = 0;
if (so->pollfds_idx != -1) {
revents = g_array_index(pollfds, GPollFD,
so->pollfds_idx).revents;
}
if (so->s != -1 &&
(revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) {
icmp_receive(so);
}
}
}
if_start(slirp);
}
}
static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
{
struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN);
uint8_t arp_reply[max(ETH_HLEN + sizeof(struct arphdr), 64)];
struct ethhdr *reh = (struct ethhdr *)arp_reply;
struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN);
int ar_op;
struct ex_list *ex_ptr;
ar_op = ntohs(ah->ar_op);
switch(ar_op) {
case ARPOP_REQUEST:
if (ah->ar_tip == ah->ar_sip) {
/* Gratuitous ARP */
arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
return;
}
if ((ah->ar_tip & slirp->vnetwork_mask.s_addr) ==
slirp->vnetwork_addr.s_addr) {
if (ah->ar_tip == slirp->vnameserver_addr.s_addr ||
ah->ar_tip == slirp->vhost_addr.s_addr)
goto arp_ok;
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
if (ex_ptr->ex_addr.s_addr == ah->ar_tip)
goto arp_ok;
}
return;
arp_ok:
memset(arp_reply, 0, sizeof(arp_reply));
arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
/* ARP request for alias/dns mac address */
memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN);
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
memcpy(&reh->h_source[2], &ah->ar_tip, 4);
reh->h_proto = htons(ETH_P_ARP);
rah->ar_hrd = htons(1);
rah->ar_pro = htons(ETH_P_IP);
rah->ar_hln = ETH_ALEN;
rah->ar_pln = 4;
rah->ar_op = htons(ARPOP_REPLY);
memcpy(rah->ar_sha, reh->h_source, ETH_ALEN);
rah->ar_sip = ah->ar_tip;
memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN);
rah->ar_tip = ah->ar_sip;
slirp_output(slirp->opaque, arp_reply, sizeof(arp_reply));
}
break;
case ARPOP_REPLY:
arp_table_add(slirp, ah->ar_sip, ah->ar_sha);
break;
default:
break;
}
}
void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
{
struct mbuf *m;
int proto;
if (pkt_len < ETH_HLEN)
return;
proto = ntohs(*(uint16_t *)(pkt + 12));
switch(proto) {
case ETH_P_ARP:
arp_input(slirp, pkt, pkt_len);
break;
case ETH_P_IP:
m = m_get(slirp);
if (!m)
return;
/* Note: we add to align the IP header */
if (M_FREEROOM(m) < pkt_len + 2) {
m_inc(m, pkt_len + 2);
}
m->m_len = pkt_len + 2;
memcpy(m->m_data + 2, pkt, pkt_len);
m->m_data += 2 + ETH_HLEN;
m->m_len -= 2 + ETH_HLEN;
ip_input(m);
break;
default:
break;
}
}
/* Output the IP packet to the ethernet device. Returns 0 if the packet must be
* re-queued.
*/
int if_encap(Slirp *slirp, struct mbuf *ifm)
{
uint8_t buf[1600];
struct ethhdr *eh = (struct ethhdr *)buf;
uint8_t ethaddr[ETH_ALEN];
const struct ip *iph = (const struct ip *)ifm->m_data;
if (ifm->m_len + ETH_HLEN > sizeof(buf)) {
return 1;
}
if (!arp_table_search(slirp, iph->ip_dst.s_addr, ethaddr)) {
uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)];
struct ethhdr *reh = (struct ethhdr *)arp_req;
struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN);
if (!ifm->arp_requested) {
/* If the client addr is not known, send an ARP request */
memset(reh->h_dest, 0xff, ETH_ALEN);
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
memcpy(&reh->h_source[2], &slirp->vhost_addr, 4);
reh->h_proto = htons(ETH_P_ARP);
rah->ar_hrd = htons(1);
rah->ar_pro = htons(ETH_P_IP);
rah->ar_hln = ETH_ALEN;
rah->ar_pln = 4;
rah->ar_op = htons(ARPOP_REQUEST);
/* source hw addr */
memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 4);
memcpy(&rah->ar_sha[2], &slirp->vhost_addr, 4);
/* source IP */
rah->ar_sip = slirp->vhost_addr.s_addr;
/* target hw addr (none) */
memset(rah->ar_tha, 0, ETH_ALEN);
/* target IP */
rah->ar_tip = iph->ip_dst.s_addr;
slirp->client_ipaddr = iph->ip_dst;
slirp_output(slirp->opaque, arp_req, sizeof(arp_req));
ifm->arp_requested = true;
/* Expire request and drop outgoing packet after 1 second */
ifm->expiration_date = qemu_get_clock_ns(rt_clock) + 1000000000ULL;
}
return 0;
} else {
memcpy(eh->h_dest, ethaddr, ETH_ALEN);
memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4);
/* XXX: not correct */
memcpy(&eh->h_source[2], &slirp->vhost_addr, 4);
eh->h_proto = htons(ETH_P_IP);
memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
slirp_output(slirp->opaque, buf, ifm->m_len + ETH_HLEN);
return 1;
}
}
/* Drop host forwarding rule, return 0 if found. */
int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
int host_port)
{
struct socket *so;
struct socket *head = (is_udp ? &slirp->udb : &slirp->tcb);
struct sockaddr_in addr;
int port = htons(host_port);
socklen_t addr_len;
for (so = head->so_next; so != head; so = so->so_next) {
addr_len = sizeof(addr);
if ((so->so_state & SS_HOSTFWD) &&
getsockname(so->s, (struct sockaddr *)&addr, &addr_len) == 0 &&
addr.sin_addr.s_addr == host_addr.s_addr &&
addr.sin_port == port) {
close(so->s);
sofree(so);
return 0;
}
}
return -1;
}
int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr,
int host_port, struct in_addr guest_addr, int guest_port)
{
if (!guest_addr.s_addr) {
guest_addr = slirp->vdhcp_startaddr;
}
if (is_udp) {
if (!udp_listen(slirp, host_addr.s_addr, htons(host_port),
guest_addr.s_addr, htons(guest_port), SS_HOSTFWD))
return -1;
} else {
if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port),
guest_addr.s_addr, htons(guest_port), SS_HOSTFWD))
return -1;
}
return 0;
}
int slirp_add_exec(Slirp *slirp, int do_pty, const void *args,
struct in_addr *guest_addr, int guest_port)
{
if (!guest_addr->s_addr) {
guest_addr->s_addr = slirp->vnetwork_addr.s_addr |
(htonl(0x0204) & ~slirp->vnetwork_mask.s_addr);
}
if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) !=
slirp->vnetwork_addr.s_addr ||
guest_addr->s_addr == slirp->vhost_addr.s_addr ||
guest_addr->s_addr == slirp->vnameserver_addr.s_addr) {
return -1;
}
return add_exec(&slirp->exec_list, do_pty, (char *)args, *guest_addr,
htons(guest_port));
}
ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags)
{
if (so->s == -1 && so->extra) {
qemu_chr_fe_write(so->extra, buf, len);
return len;
}
return send(so->s, buf, len, flags);
}
static struct socket *
slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port)
{
struct socket *so;
for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
if (so->so_faddr.s_addr == guest_addr.s_addr &&
htons(so->so_fport) == guest_port) {
return so;
}
}
return NULL;
}
size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr,
int guest_port)
{
struct iovec iov[2];
struct socket *so;
so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
if (!so || so->so_state & SS_NOFDREF) {
return 0;
}
if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) {
return 0;
}
return sopreprbuf(so, iov, NULL);
}
void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port,
const uint8_t *buf, int size)
{
int ret;
struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
if (!so)
return;
ret = soreadbuf(so, (const char *)buf, size);
if (ret > 0)
tcp_output(sototcpcb(so));
}
static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp)
{
int i;
qemu_put_sbe16(f, tp->t_state);
for (i = 0; i < TCPT_NTIMERS; i++)
qemu_put_sbe16(f, tp->t_timer[i]);
qemu_put_sbe16(f, tp->t_rxtshift);
qemu_put_sbe16(f, tp->t_rxtcur);
qemu_put_sbe16(f, tp->t_dupacks);
qemu_put_be16(f, tp->t_maxseg);
qemu_put_sbyte(f, tp->t_force);
qemu_put_be16(f, tp->t_flags);
qemu_put_be32(f, tp->snd_una);
qemu_put_be32(f, tp->snd_nxt);
qemu_put_be32(f, tp->snd_up);
qemu_put_be32(f, tp->snd_wl1);
qemu_put_be32(f, tp->snd_wl2);
qemu_put_be32(f, tp->iss);
qemu_put_be32(f, tp->snd_wnd);
qemu_put_be32(f, tp->rcv_wnd);
qemu_put_be32(f, tp->rcv_nxt);
qemu_put_be32(f, tp->rcv_up);
qemu_put_be32(f, tp->irs);
qemu_put_be32(f, tp->rcv_adv);
qemu_put_be32(f, tp->snd_max);
qemu_put_be32(f, tp->snd_cwnd);
qemu_put_be32(f, tp->snd_ssthresh);
qemu_put_sbe16(f, tp->t_idle);
qemu_put_sbe16(f, tp->t_rtt);
qemu_put_be32(f, tp->t_rtseq);
qemu_put_sbe16(f, tp->t_srtt);
qemu_put_sbe16(f, tp->t_rttvar);
qemu_put_be16(f, tp->t_rttmin);
qemu_put_be32(f, tp->max_sndwnd);
qemu_put_byte(f, tp->t_oobflags);
qemu_put_byte(f, tp->t_iobc);
qemu_put_sbe16(f, tp->t_softerror);
qemu_put_byte(f, tp->snd_scale);
qemu_put_byte(f, tp->rcv_scale);
qemu_put_byte(f, tp->request_r_scale);
qemu_put_byte(f, tp->requested_s_scale);
qemu_put_be32(f, tp->ts_recent);
qemu_put_be32(f, tp->ts_recent_age);
qemu_put_be32(f, tp->last_ack_sent);
}
static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf)
{
uint32_t off;
qemu_put_be32(f, sbuf->sb_cc);
qemu_put_be32(f, sbuf->sb_datalen);
off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data);
qemu_put_sbe32(f, off);
off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data);
qemu_put_sbe32(f, off);
qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen);
}
static void slirp_socket_save(QEMUFile *f, struct socket *so)
{
qemu_put_be32(f, so->so_urgc);
qemu_put_be32(f, so->so_faddr.s_addr);
qemu_put_be32(f, so->so_laddr.s_addr);
qemu_put_be16(f, so->so_fport);
qemu_put_be16(f, so->so_lport);
qemu_put_byte(f, so->so_iptos);
qemu_put_byte(f, so->so_emu);
qemu_put_byte(f, so->so_type);
qemu_put_be32(f, so->so_state);
slirp_sbuf_save(f, &so->so_rcv);
slirp_sbuf_save(f, &so->so_snd);
slirp_tcp_save(f, so->so_tcpcb);
}
static void slirp_bootp_save(QEMUFile *f, Slirp *slirp)
{
int i;
for (i = 0; i < NB_BOOTP_CLIENTS; i++) {
qemu_put_be16(f, slirp->bootp_clients[i].allocated);
qemu_put_buffer(f, slirp->bootp_clients[i].macaddr, 6);
}
}
static void slirp_state_save(QEMUFile *f, void *opaque)
{
Slirp *slirp = opaque;
struct ex_list *ex_ptr;
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
if (ex_ptr->ex_pty == 3) {
struct socket *so;
so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr,
ntohs(ex_ptr->ex_fport));
if (!so)
continue;
qemu_put_byte(f, 42);
slirp_socket_save(f, so);
}
qemu_put_byte(f, 0);
qemu_put_be16(f, slirp->ip_id);
slirp_bootp_save(f, slirp);
}
static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp)
{
int i;
tp->t_state = qemu_get_sbe16(f);
for (i = 0; i < TCPT_NTIMERS; i++)
tp->t_timer[i] = qemu_get_sbe16(f);
tp->t_rxtshift = qemu_get_sbe16(f);
tp->t_rxtcur = qemu_get_sbe16(f);
tp->t_dupacks = qemu_get_sbe16(f);
tp->t_maxseg = qemu_get_be16(f);
tp->t_force = qemu_get_sbyte(f);
tp->t_flags = qemu_get_be16(f);
tp->snd_una = qemu_get_be32(f);
tp->snd_nxt = qemu_get_be32(f);
tp->snd_up = qemu_get_be32(f);
tp->snd_wl1 = qemu_get_be32(f);
tp->snd_wl2 = qemu_get_be32(f);
tp->iss = qemu_get_be32(f);
tp->snd_wnd = qemu_get_be32(f);
tp->rcv_wnd = qemu_get_be32(f);
tp->rcv_nxt = qemu_get_be32(f);
tp->rcv_up = qemu_get_be32(f);
tp->irs = qemu_get_be32(f);
tp->rcv_adv = qemu_get_be32(f);
tp->snd_max = qemu_get_be32(f);
tp->snd_cwnd = qemu_get_be32(f);
tp->snd_ssthresh = qemu_get_be32(f);
tp->t_idle = qemu_get_sbe16(f);
tp->t_rtt = qemu_get_sbe16(f);
tp->t_rtseq = qemu_get_be32(f);
tp->t_srtt = qemu_get_sbe16(f);
tp->t_rttvar = qemu_get_sbe16(f);
tp->t_rttmin = qemu_get_be16(f);
tp->max_sndwnd = qemu_get_be32(f);
tp->t_oobflags = qemu_get_byte(f);
tp->t_iobc = qemu_get_byte(f);
tp->t_softerror = qemu_get_sbe16(f);
tp->snd_scale = qemu_get_byte(f);
tp->rcv_scale = qemu_get_byte(f);
tp->request_r_scale = qemu_get_byte(f);
tp->requested_s_scale = qemu_get_byte(f);
tp->ts_recent = qemu_get_be32(f);
tp->ts_recent_age = qemu_get_be32(f);
tp->last_ack_sent = qemu_get_be32(f);
tcp_template(tp);
}
static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf)
{
uint32_t off, sb_cc, sb_datalen;
sb_cc = qemu_get_be32(f);
sb_datalen = qemu_get_be32(f);
sbreserve(sbuf, sb_datalen);
if (sbuf->sb_datalen != sb_datalen)
return -ENOMEM;
sbuf->sb_cc = sb_cc;
off = qemu_get_sbe32(f);
sbuf->sb_wptr = sbuf->sb_data + off;
off = qemu_get_sbe32(f);
sbuf->sb_rptr = sbuf->sb_data + off;
qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen);
return 0;
}
static int slirp_socket_load(QEMUFile *f, struct socket *so)
{
if (tcp_attach(so) < 0)
return -ENOMEM;
so->so_urgc = qemu_get_be32(f);
so->so_faddr.s_addr = qemu_get_be32(f);
so->so_laddr.s_addr = qemu_get_be32(f);
so->so_fport = qemu_get_be16(f);
so->so_lport = qemu_get_be16(f);
so->so_iptos = qemu_get_byte(f);
so->so_emu = qemu_get_byte(f);
so->so_type = qemu_get_byte(f);
so->so_state = qemu_get_be32(f);
if (slirp_sbuf_load(f, &so->so_rcv) < 0)
return -ENOMEM;
if (slirp_sbuf_load(f, &so->so_snd) < 0)
return -ENOMEM;
slirp_tcp_load(f, so->so_tcpcb);
return 0;
}
static void slirp_bootp_load(QEMUFile *f, Slirp *slirp)
{
int i;
for (i = 0; i < NB_BOOTP_CLIENTS; i++) {
slirp->bootp_clients[i].allocated = qemu_get_be16(f);
qemu_get_buffer(f, slirp->bootp_clients[i].macaddr, 6);
}
}
static int slirp_state_load(QEMUFile *f, void *opaque, int version_id)
{
Slirp *slirp = opaque;
struct ex_list *ex_ptr;
while (qemu_get_byte(f)) {
int ret;
struct socket *so = socreate(slirp);
if (!so)
return -ENOMEM;
ret = slirp_socket_load(f, so);
if (ret < 0)
return ret;
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) !=
slirp->vnetwork_addr.s_addr) {
return -EINVAL;
}
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
if (ex_ptr->ex_pty == 3 &&
so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr &&
so->so_fport == ex_ptr->ex_fport) {
break;
}
}
if (!ex_ptr)
return -EINVAL;
so->extra = (void *)ex_ptr->ex_exec;
}
if (version_id >= 2) {
slirp->ip_id = qemu_get_be16(f);
}
if (version_id >= 3) {
slirp_bootp_load(f, slirp);
}
return 0;
}
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