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slirp.c
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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 "qemu-char.h"
#include "slirp.h"
#include "hw/hw.h"
/* host loopback address */
struct in_addr loopback_addr;
/* 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 };
/* XXX: suppress those select globals */
fd_set *global_readfds, *global_writefds, *global_xfds;
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);
}
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, 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);
}
if (tftp_path) {
slirp->tftp_prefix = g_strdup(tftp_path);
}
if (bootfile) {
slirp->bootp_filename = g_strdup(bootfile);
}
slirp->vdhcp_startaddr = vdhcp_start;
slirp->vnameserver_addr = vnameserver;
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->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)
#define UPD_NFDS(x) if (nfds < (x)) nfds = (x)
void slirp_update_timeout(uint32_t *timeout)
{
if (!QTAILQ_EMPTY(&slirp_instances)) {
*timeout = MIN(1000, *timeout);
}
}
void slirp_select_fill(int *pnfds,
fd_set *readfds, fd_set *writefds, fd_set *xfds)
{
Slirp *slirp;
struct socket *so, *so_next;
int nfds;
if (QTAILQ_EMPTY(&slirp_instances)) {
return;
}
/* fail safe */
global_readfds = NULL;
global_writefds = NULL;
global_xfds = NULL;
nfds = *pnfds;
/*
* 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) {
so_next = so->so_next;
/*
* 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) {
FD_SET(so->s, readfds);
UPD_NFDS(so->s);
continue;
}
/*
* Set for writing sockets which are connecting
*/
if (so->so_state & SS_ISFCONNECTING) {
FD_SET(so->s, writefds);
UPD_NFDS(so->s);
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) {
FD_SET(so->s, writefds);
UPD_NFDS(so->s);
}
/*
* 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))) {
FD_SET(so->s, readfds);
FD_SET(so->s, xfds);
UPD_NFDS(so->s);
}
}
/*
* UDP sockets
*/
for (so = slirp->udb.so_next; so != &slirp->udb;
so = so_next) {
so_next = so->so_next;
/*
* 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) {
FD_SET(so->s, readfds);
UPD_NFDS(so->s);
}
}
/*
* ICMP sockets
*/
for (so = slirp->icmp.so_next; so != &slirp->icmp;
so = so_next) {
so_next = so->so_next;
/*
* 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) {
FD_SET(so->s, readfds);
UPD_NFDS(so->s);
}
}
}
*pnfds = nfds;
}
void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds,
int select_error)
{
Slirp *slirp;
struct socket *so, *so_next;
int ret;
if (QTAILQ_EMPTY(&slirp_instances)) {
return;
}
global_readfds = readfds;
global_writefds = writefds;
global_xfds = xfds;
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) {
so_next = so->so_next;
/*
* FD_ISSET is meaningless on these sockets
* (and they can crash the program)
*/
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 readfds below if this succeeds
*/
if (FD_ISSET(so->s, xfds))
sorecvoob(so);
/*
* Check sockets for reading
*/
else if (FD_ISSET(so->s, readfds)) {
/*
* 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 (FD_ISSET(so->s, writefds)) {
/*
* 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) {
so_next = so->so_next;
if (so->s != -1 && FD_ISSET(so->s, readfds)) {
sorecvfrom(so);
}
}
/*
* Check incoming ICMP relies.
*/
for (so = slirp->icmp.so_next; so != &slirp->icmp;
so = so_next) {
so_next = so->so_next;
if (so->s != -1 && FD_ISSET(so->s, readfds)) {
icmp_receive(so);
}
}
}
if_start(slirp);
}
/* clear global file descriptor sets.
* these reside on the stack in vl.c
* so they're unusable if we're not in
* slirp_select_fill or slirp_select_poll.
*/
global_readfds = NULL;
global_writefds = NULL;
global_xfds = NULL;
}
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);