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/*
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* libslirp glue
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*
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* Copyright (c) 2004-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu-common.h" |
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#include "qemu-char.h" |
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#include "slirp.h" |
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#include "hw/hw.h" |
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/* host address */
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struct in_addr our_addr;
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/* host dns address */
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struct in_addr dns_addr;
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/* host loopback address */
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struct in_addr loopback_addr;
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/* emulated hosts use the MAC addr 52:55:IP:IP:IP:IP */
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static const uint8_t special_ethaddr[6] = { |
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0x52, 0x55, 0x00, 0x00, 0x00, 0x00 |
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}; |
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static const uint8_t zero_ethaddr[6] = { 0, 0, 0, 0, 0, 0 }; |
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/* XXX: suppress those select globals */
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fd_set *global_readfds, *global_writefds, *global_xfds; |
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u_int curtime; |
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static u_int time_fasttimo, last_slowtimo;
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static int do_slowtimo; |
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Slirp *slirp_instance; |
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#ifdef _WIN32
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static int get_dns_addr(struct in_addr *pdns_addr) |
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{ |
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FIXED_INFO *FixedInfo=NULL;
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ULONG BufLen; |
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DWORD ret; |
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IP_ADDR_STRING *pIPAddr; |
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struct in_addr tmp_addr;
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FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
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BufLen = sizeof(FIXED_INFO);
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if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) {
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if (FixedInfo) {
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GlobalFree(FixedInfo); |
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FixedInfo = NULL;
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} |
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FixedInfo = GlobalAlloc(GPTR, BufLen); |
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} |
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if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) {
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printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret );
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if (FixedInfo) {
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GlobalFree(FixedInfo); |
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FixedInfo = NULL;
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} |
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return -1; |
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} |
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pIPAddr = &(FixedInfo->DnsServerList); |
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inet_aton(pIPAddr->IpAddress.String, &tmp_addr); |
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*pdns_addr = tmp_addr; |
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if (FixedInfo) {
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GlobalFree(FixedInfo); |
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FixedInfo = NULL;
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} |
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return 0; |
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} |
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static void winsock_cleanup(void) |
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{ |
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WSACleanup(); |
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} |
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|
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#else
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static int get_dns_addr(struct in_addr *pdns_addr) |
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{ |
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char buff[512]; |
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char buff2[257]; |
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FILE *f; |
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int found = 0; |
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struct in_addr tmp_addr;
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f = fopen("/etc/resolv.conf", "r"); |
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if (!f)
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return -1; |
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#ifdef DEBUG
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lprint("IP address of your DNS(s): ");
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#endif
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while (fgets(buff, 512, f) != NULL) { |
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if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) { |
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if (!inet_aton(buff2, &tmp_addr))
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continue;
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if (tmp_addr.s_addr == loopback_addr.s_addr)
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tmp_addr = our_addr; |
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/* If it's the first one, set it to dns_addr */
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if (!found)
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*pdns_addr = tmp_addr; |
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#ifdef DEBUG
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else
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lprint(", ");
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#endif
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if (++found > 3) { |
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#ifdef DEBUG
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lprint("(more)");
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#endif
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break;
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} |
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#ifdef DEBUG
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else
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lprint("%s", inet_ntoa(tmp_addr));
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#endif
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} |
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} |
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fclose(f); |
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if (!found)
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return -1; |
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return 0; |
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} |
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#endif
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static void slirp_init_once(void) |
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{ |
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static int initialized; |
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struct hostent *he;
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char our_name[256]; |
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#ifdef _WIN32
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WSADATA Data; |
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#endif
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if (initialized) {
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return;
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} |
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initialized = 1;
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#ifdef _WIN32
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WSAStartup(MAKEWORD(2,0), &Data); |
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atexit(winsock_cleanup); |
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#endif
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loopback_addr.s_addr = htonl(INADDR_LOOPBACK); |
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/* FIXME: This address may change during runtime */
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if (gethostname(our_name, sizeof(our_name)) == 0) { |
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he = gethostbyname(our_name); |
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if (he) {
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our_addr = *(struct in_addr *)he->h_addr;
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} |
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} |
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if (our_addr.s_addr == 0) { |
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our_addr = loopback_addr; |
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} |
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/* FIXME: This address may change during runtime */
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if (get_dns_addr(&dns_addr) < 0) { |
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dns_addr = loopback_addr; |
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} |
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} |
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static void slirp_state_save(QEMUFile *f, void *opaque); |
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static int slirp_state_load(QEMUFile *f, void *opaque, int version_id); |
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Slirp *slirp_init(int restricted, struct in_addr vnetwork, |
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struct in_addr vnetmask, struct in_addr vhost, |
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const char *vhostname, const char *tftp_path, |
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const char *bootfile, struct in_addr vdhcp_start, |
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struct in_addr vnameserver, void *opaque) |
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{ |
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Slirp *slirp = qemu_mallocz(sizeof(Slirp));
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slirp_init_once(); |
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slirp->restricted = restricted; |
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if_init(slirp); |
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ip_init(slirp); |
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/* Initialise mbufs *after* setting the MTU */
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m_init(slirp); |
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slirp->vnetwork_addr = vnetwork; |
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slirp->vnetwork_mask = vnetmask; |
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slirp->vhost_addr = vhost; |
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if (vhostname) {
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pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname),
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vhostname); |
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} |
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if (tftp_path) {
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slirp->tftp_prefix = qemu_strdup(tftp_path); |
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} |
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if (bootfile) {
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slirp->bootp_filename = qemu_strdup(bootfile); |
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} |
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slirp->vdhcp_startaddr = vdhcp_start; |
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slirp->vnameserver_addr = vnameserver; |
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slirp->opaque = opaque; |
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register_savevm("slirp", 0, 2, slirp_state_save, slirp_state_load, slirp); |
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slirp_instance = slirp; |
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return slirp;
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} |
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void slirp_cleanup(Slirp *slirp)
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{ |
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unregister_savevm("slirp", slirp);
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qemu_free(slirp->tftp_prefix); |
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qemu_free(slirp->bootp_filename); |
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qemu_free(slirp); |
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slirp_instance = NULL;
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} |
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#define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
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#define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED)
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#define UPD_NFDS(x) if (nfds < (x)) nfds = (x) |
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/*
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* curtime kept to an accuracy of 1ms
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*/
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#ifdef _WIN32
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static void updtime(void) |
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{ |
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struct _timeb tb;
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_ftime(&tb); |
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curtime = tb.time * 1000 + tb.millitm;
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} |
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#else
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static void updtime(void) |
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{ |
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struct timeval tv;
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gettimeofday(&tv, NULL);
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curtime = tv.tv_sec * 1000 + tv.tv_usec / 1000; |
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} |
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#endif
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void slirp_select_fill(int *pnfds, |
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fd_set *readfds, fd_set *writefds, fd_set *xfds) |
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{ |
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Slirp *slirp = slirp_instance; |
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struct socket *so, *so_next;
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int nfds;
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if (!slirp_instance) {
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return;
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} |
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/* fail safe */
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global_readfds = NULL;
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global_writefds = NULL;
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global_xfds = NULL;
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nfds = *pnfds; |
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/*
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* First, TCP sockets
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*/
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do_slowtimo = 0;
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/*
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* *_slowtimo needs calling if there are IP fragments
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* in the fragment queue, or there are TCP connections active
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*/
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do_slowtimo = ((slirp->tcb.so_next != &slirp->tcb) || |
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(&slirp->ipq.ip_link != slirp->ipq.ip_link.next)); |
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|
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for (so = slirp->tcb.so_next; so != &slirp->tcb;
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so = so_next) { |
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so_next = so->so_next; |
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/*
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* See if we need a tcp_fasttimo
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*/
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if (time_fasttimo == 0 && so->so_tcpcb->t_flags & TF_DELACK) |
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time_fasttimo = curtime; /* Flag when we want a fasttimo */
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/*
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* NOFDREF can include still connecting to local-host,
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* newly socreated() sockets etc. Don't want to select these.
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*/
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if (so->so_state & SS_NOFDREF || so->s == -1) |
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continue;
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/*
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* Set for reading sockets which are accepting
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*/
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if (so->so_state & SS_FACCEPTCONN) {
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FD_SET(so->s, readfds); |
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UPD_NFDS(so->s); |
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continue;
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} |
323 |
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/*
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* Set for writing sockets which are connecting
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*/
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if (so->so_state & SS_ISFCONNECTING) {
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FD_SET(so->s, writefds); |
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UPD_NFDS(so->s); |
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continue;
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} |
332 |
|
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/*
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* Set for writing if we are connected, can send more, and
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* we have something to send
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*/
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337 |
if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
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FD_SET(so->s, writefds); |
339 |
UPD_NFDS(so->s); |
340 |
} |
341 |
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342 |
/*
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* Set for reading (and urgent data) if we are connected, can
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* receive more, and we have room for it XXX /2 ?
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*/
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if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) { |
347 |
FD_SET(so->s, readfds); |
348 |
FD_SET(so->s, xfds); |
349 |
UPD_NFDS(so->s); |
350 |
} |
351 |
} |
352 |
|
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/*
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354 |
* UDP sockets
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355 |
*/
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356 |
for (so = slirp->udb.so_next; so != &slirp->udb;
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357 |
so = so_next) { |
358 |
so_next = so->so_next; |
359 |
|
360 |
/*
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361 |
* See if it's timed out
|
362 |
*/
|
363 |
if (so->so_expire) {
|
364 |
if (so->so_expire <= curtime) {
|
365 |
udp_detach(so); |
366 |
continue;
|
367 |
} else
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368 |
do_slowtimo = 1; /* Let socket expire */ |
369 |
} |
370 |
|
371 |
/*
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372 |
* When UDP packets are received from over the
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373 |
* link, they're sendto()'d straight away, so
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374 |
* no need for setting for writing
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375 |
* Limit the number of packets queued by this session
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376 |
* to 4. Note that even though we try and limit this
|
377 |
* to 4 packets, the session could have more queued
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378 |
* if the packets needed to be fragmented
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379 |
* (XXX <= 4 ?)
|
380 |
*/
|
381 |
if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { |
382 |
FD_SET(so->s, readfds); |
383 |
UPD_NFDS(so->s); |
384 |
} |
385 |
} |
386 |
|
387 |
*pnfds = nfds; |
388 |
} |
389 |
|
390 |
void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds,
|
391 |
int select_error)
|
392 |
{ |
393 |
Slirp *slirp = slirp_instance; |
394 |
struct socket *so, *so_next;
|
395 |
int ret;
|
396 |
|
397 |
if (!slirp_instance) {
|
398 |
return;
|
399 |
} |
400 |
|
401 |
global_readfds = readfds; |
402 |
global_writefds = writefds; |
403 |
global_xfds = xfds; |
404 |
|
405 |
/* Update time */
|
406 |
updtime(); |
407 |
|
408 |
/*
|
409 |
* See if anything has timed out
|
410 |
*/
|
411 |
if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) { |
412 |
tcp_fasttimo(slirp); |
413 |
time_fasttimo = 0;
|
414 |
} |
415 |
if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) { |
416 |
ip_slowtimo(slirp); |
417 |
tcp_slowtimo(slirp); |
418 |
last_slowtimo = curtime; |
419 |
} |
420 |
|
421 |
/*
|
422 |
* Check sockets
|
423 |
*/
|
424 |
if (!select_error) {
|
425 |
/*
|
426 |
* Check TCP sockets
|
427 |
*/
|
428 |
for (so = slirp->tcb.so_next; so != &slirp->tcb;
|
429 |
so = so_next) { |
430 |
so_next = so->so_next; |
431 |
|
432 |
/*
|
433 |
* FD_ISSET is meaningless on these sockets
|
434 |
* (and they can crash the program)
|
435 |
*/
|
436 |
if (so->so_state & SS_NOFDREF || so->s == -1) |
437 |
continue;
|
438 |
|
439 |
/*
|
440 |
* Check for URG data
|
441 |
* This will soread as well, so no need to
|
442 |
* test for readfds below if this succeeds
|
443 |
*/
|
444 |
if (FD_ISSET(so->s, xfds))
|
445 |
sorecvoob(so); |
446 |
/*
|
447 |
* Check sockets for reading
|
448 |
*/
|
449 |
else if (FD_ISSET(so->s, readfds)) { |
450 |
/*
|
451 |
* Check for incoming connections
|
452 |
*/
|
453 |
if (so->so_state & SS_FACCEPTCONN) {
|
454 |
tcp_connect(so); |
455 |
continue;
|
456 |
} /* else */
|
457 |
ret = soread(so); |
458 |
|
459 |
/* Output it if we read something */
|
460 |
if (ret > 0) |
461 |
tcp_output(sototcpcb(so)); |
462 |
} |
463 |
|
464 |
/*
|
465 |
* Check sockets for writing
|
466 |
*/
|
467 |
if (FD_ISSET(so->s, writefds)) {
|
468 |
/*
|
469 |
* Check for non-blocking, still-connecting sockets
|
470 |
*/
|
471 |
if (so->so_state & SS_ISFCONNECTING) {
|
472 |
/* Connected */
|
473 |
so->so_state &= ~SS_ISFCONNECTING; |
474 |
|
475 |
ret = send(so->s, (const void *) &ret, 0, 0); |
476 |
if (ret < 0) { |
477 |
/* XXXXX Must fix, zero bytes is a NOP */
|
478 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
479 |
errno == EINPROGRESS || errno == ENOTCONN) |
480 |
continue;
|
481 |
|
482 |
/* else failed */
|
483 |
so->so_state &= SS_PERSISTENT_MASK; |
484 |
so->so_state |= SS_NOFDREF; |
485 |
} |
486 |
/* else so->so_state &= ~SS_ISFCONNECTING; */
|
487 |
|
488 |
/*
|
489 |
* Continue tcp_input
|
490 |
*/
|
491 |
tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); |
492 |
/* continue; */
|
493 |
} else
|
494 |
ret = sowrite(so); |
495 |
/*
|
496 |
* XXXXX If we wrote something (a lot), there
|
497 |
* could be a need for a window update.
|
498 |
* In the worst case, the remote will send
|
499 |
* a window probe to get things going again
|
500 |
*/
|
501 |
} |
502 |
|
503 |
/*
|
504 |
* Probe a still-connecting, non-blocking socket
|
505 |
* to check if it's still alive
|
506 |
*/
|
507 |
#ifdef PROBE_CONN
|
508 |
if (so->so_state & SS_ISFCONNECTING) {
|
509 |
ret = recv(so->s, (char *)&ret, 0,0); |
510 |
|
511 |
if (ret < 0) { |
512 |
/* XXX */
|
513 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
514 |
errno == EINPROGRESS || errno == ENOTCONN) |
515 |
continue; /* Still connecting, continue */ |
516 |
|
517 |
/* else failed */
|
518 |
so->so_state &= SS_PERSISTENT_MASK; |
519 |
so->so_state |= SS_NOFDREF; |
520 |
|
521 |
/* tcp_input will take care of it */
|
522 |
} else {
|
523 |
ret = send(so->s, &ret, 0,0); |
524 |
if (ret < 0) { |
525 |
/* XXX */
|
526 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
527 |
errno == EINPROGRESS || errno == ENOTCONN) |
528 |
continue;
|
529 |
/* else failed */
|
530 |
so->so_state &= SS_PERSISTENT_MASK; |
531 |
so->so_state |= SS_NOFDREF; |
532 |
} else
|
533 |
so->so_state &= ~SS_ISFCONNECTING; |
534 |
|
535 |
} |
536 |
tcp_input((struct mbuf *)NULL, sizeof(struct ip),so); |
537 |
} /* SS_ISFCONNECTING */
|
538 |
#endif
|
539 |
} |
540 |
|
541 |
/*
|
542 |
* Now UDP sockets.
|
543 |
* Incoming packets are sent straight away, they're not buffered.
|
544 |
* Incoming UDP data isn't buffered either.
|
545 |
*/
|
546 |
for (so = slirp->udb.so_next; so != &slirp->udb;
|
547 |
so = so_next) { |
548 |
so_next = so->so_next; |
549 |
|
550 |
if (so->s != -1 && FD_ISSET(so->s, readfds)) { |
551 |
sorecvfrom(so); |
552 |
} |
553 |
} |
554 |
} |
555 |
|
556 |
/*
|
557 |
* See if we can start outputting
|
558 |
*/
|
559 |
if (slirp->if_queued) {
|
560 |
if_start(slirp); |
561 |
} |
562 |
|
563 |
/* clear global file descriptor sets.
|
564 |
* these reside on the stack in vl.c
|
565 |
* so they're unusable if we're not in
|
566 |
* slirp_select_fill or slirp_select_poll.
|
567 |
*/
|
568 |
global_readfds = NULL;
|
569 |
global_writefds = NULL;
|
570 |
global_xfds = NULL;
|
571 |
} |
572 |
|
573 |
#define ETH_ALEN 6 |
574 |
#define ETH_HLEN 14 |
575 |
|
576 |
#define ETH_P_IP 0x0800 /* Internet Protocol packet */ |
577 |
#define ETH_P_ARP 0x0806 /* Address Resolution packet */ |
578 |
|
579 |
#define ARPOP_REQUEST 1 /* ARP request */ |
580 |
#define ARPOP_REPLY 2 /* ARP reply */ |
581 |
|
582 |
struct ethhdr
|
583 |
{ |
584 |
unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ |
585 |
unsigned char h_source[ETH_ALEN]; /* source ether addr */ |
586 |
unsigned short h_proto; /* packet type ID field */ |
587 |
}; |
588 |
|
589 |
struct arphdr
|
590 |
{ |
591 |
unsigned short ar_hrd; /* format of hardware address */ |
592 |
unsigned short ar_pro; /* format of protocol address */ |
593 |
unsigned char ar_hln; /* length of hardware address */ |
594 |
unsigned char ar_pln; /* length of protocol address */ |
595 |
unsigned short ar_op; /* ARP opcode (command) */ |
596 |
|
597 |
/*
|
598 |
* Ethernet looks like this : This bit is variable sized however...
|
599 |
*/
|
600 |
unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ |
601 |
uint32_t ar_sip; /* sender IP address */
|
602 |
unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ |
603 |
uint32_t ar_tip ; /* target IP address */
|
604 |
} __attribute__((packed)); |
605 |
|
606 |
static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) |
607 |
{ |
608 |
struct ethhdr *eh = (struct ethhdr *)pkt; |
609 |
struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN); |
610 |
uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)]; |
611 |
struct ethhdr *reh = (struct ethhdr *)arp_reply; |
612 |
struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN); |
613 |
int ar_op;
|
614 |
struct ex_list *ex_ptr;
|
615 |
|
616 |
ar_op = ntohs(ah->ar_op); |
617 |
switch(ar_op) {
|
618 |
case ARPOP_REQUEST:
|
619 |
if ((ah->ar_tip & slirp->vnetwork_mask.s_addr) ==
|
620 |
slirp->vnetwork_addr.s_addr) { |
621 |
if (ah->ar_tip == slirp->vnameserver_addr.s_addr ||
|
622 |
ah->ar_tip == slirp->vhost_addr.s_addr) |
623 |
goto arp_ok;
|
624 |
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
625 |
if (ex_ptr->ex_addr.s_addr == ah->ar_tip)
|
626 |
goto arp_ok;
|
627 |
} |
628 |
return;
|
629 |
arp_ok:
|
630 |
/* XXX: make an ARP request to have the client address */
|
631 |
memcpy(slirp->client_ethaddr, eh->h_source, ETH_ALEN); |
632 |
|
633 |
/* ARP request for alias/dns mac address */
|
634 |
memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); |
635 |
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
|
636 |
memcpy(&reh->h_source[2], &ah->ar_tip, 4); |
637 |
reh->h_proto = htons(ETH_P_ARP); |
638 |
|
639 |
rah->ar_hrd = htons(1);
|
640 |
rah->ar_pro = htons(ETH_P_IP); |
641 |
rah->ar_hln = ETH_ALEN; |
642 |
rah->ar_pln = 4;
|
643 |
rah->ar_op = htons(ARPOP_REPLY); |
644 |
memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); |
645 |
rah->ar_sip = ah->ar_tip; |
646 |
memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); |
647 |
rah->ar_tip = ah->ar_sip; |
648 |
slirp_output(slirp->opaque, arp_reply, sizeof(arp_reply));
|
649 |
} |
650 |
break;
|
651 |
case ARPOP_REPLY:
|
652 |
/* reply to request of client mac address ? */
|
653 |
if (!memcmp(slirp->client_ethaddr, zero_ethaddr, ETH_ALEN) &&
|
654 |
ah->ar_sip == slirp->client_ipaddr.s_addr) { |
655 |
memcpy(slirp->client_ethaddr, ah->ar_sha, ETH_ALEN); |
656 |
} |
657 |
break;
|
658 |
default:
|
659 |
break;
|
660 |
} |
661 |
} |
662 |
|
663 |
void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) |
664 |
{ |
665 |
struct mbuf *m;
|
666 |
int proto;
|
667 |
|
668 |
if (pkt_len < ETH_HLEN)
|
669 |
return;
|
670 |
|
671 |
proto = ntohs(*(uint16_t *)(pkt + 12));
|
672 |
switch(proto) {
|
673 |
case ETH_P_ARP:
|
674 |
arp_input(slirp, pkt, pkt_len); |
675 |
break;
|
676 |
case ETH_P_IP:
|
677 |
m = m_get(slirp); |
678 |
if (!m)
|
679 |
return;
|
680 |
/* Note: we add to align the IP header */
|
681 |
if (M_FREEROOM(m) < pkt_len + 2) { |
682 |
m_inc(m, pkt_len + 2);
|
683 |
} |
684 |
m->m_len = pkt_len + 2;
|
685 |
memcpy(m->m_data + 2, pkt, pkt_len);
|
686 |
|
687 |
m->m_data += 2 + ETH_HLEN;
|
688 |
m->m_len -= 2 + ETH_HLEN;
|
689 |
|
690 |
ip_input(m); |
691 |
break;
|
692 |
default:
|
693 |
break;
|
694 |
} |
695 |
} |
696 |
|
697 |
/* output the IP packet to the ethernet device */
|
698 |
void if_encap(Slirp *slirp, const uint8_t *ip_data, int ip_data_len) |
699 |
{ |
700 |
uint8_t buf[1600];
|
701 |
struct ethhdr *eh = (struct ethhdr *)buf; |
702 |
|
703 |
if (ip_data_len + ETH_HLEN > sizeof(buf)) |
704 |
return;
|
705 |
|
706 |
if (!memcmp(slirp->client_ethaddr, zero_ethaddr, ETH_ALEN)) {
|
707 |
uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; |
708 |
struct ethhdr *reh = (struct ethhdr *)arp_req; |
709 |
struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); |
710 |
const struct ip *iph = (const struct ip *)ip_data; |
711 |
|
712 |
/* If the client addr is not known, there is no point in
|
713 |
sending the packet to it. Normally the sender should have
|
714 |
done an ARP request to get its MAC address. Here we do it
|
715 |
in place of sending the packet and we hope that the sender
|
716 |
will retry sending its packet. */
|
717 |
memset(reh->h_dest, 0xff, ETH_ALEN);
|
718 |
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
|
719 |
memcpy(&reh->h_source[2], &slirp->vhost_addr, 4); |
720 |
reh->h_proto = htons(ETH_P_ARP); |
721 |
rah->ar_hrd = htons(1);
|
722 |
rah->ar_pro = htons(ETH_P_IP); |
723 |
rah->ar_hln = ETH_ALEN; |
724 |
rah->ar_pln = 4;
|
725 |
rah->ar_op = htons(ARPOP_REQUEST); |
726 |
/* source hw addr */
|
727 |
memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 4);
|
728 |
memcpy(&rah->ar_sha[2], &slirp->vhost_addr, 4); |
729 |
/* source IP */
|
730 |
rah->ar_sip = slirp->vhost_addr.s_addr; |
731 |
/* target hw addr (none) */
|
732 |
memset(rah->ar_tha, 0, ETH_ALEN);
|
733 |
/* target IP */
|
734 |
rah->ar_tip = iph->ip_dst.s_addr; |
735 |
slirp->client_ipaddr = iph->ip_dst; |
736 |
slirp_output(slirp->opaque, arp_req, sizeof(arp_req));
|
737 |
} else {
|
738 |
memcpy(eh->h_dest, slirp->client_ethaddr, ETH_ALEN); |
739 |
memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4);
|
740 |
/* XXX: not correct */
|
741 |
memcpy(&eh->h_source[2], &slirp->vhost_addr, 4); |
742 |
eh->h_proto = htons(ETH_P_IP); |
743 |
memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len); |
744 |
slirp_output(slirp->opaque, buf, ip_data_len + ETH_HLEN); |
745 |
} |
746 |
} |
747 |
|
748 |
/* Drop host forwarding rule, return 0 if found. */
|
749 |
int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, |
750 |
int host_port)
|
751 |
{ |
752 |
struct socket *so;
|
753 |
struct socket *head = (is_udp ? &slirp->udb : &slirp->tcb);
|
754 |
struct sockaddr_in addr;
|
755 |
int port = htons(host_port);
|
756 |
socklen_t addr_len; |
757 |
|
758 |
for (so = head->so_next; so != head; so = so->so_next) {
|
759 |
addr_len = sizeof(addr);
|
760 |
if ((so->so_state & SS_HOSTFWD) &&
|
761 |
getsockname(so->s, (struct sockaddr *)&addr, &addr_len) == 0 && |
762 |
addr.sin_addr.s_addr == host_addr.s_addr && |
763 |
addr.sin_port == port) { |
764 |
close(so->s); |
765 |
sofree(so); |
766 |
return 0; |
767 |
} |
768 |
} |
769 |
|
770 |
return -1; |
771 |
} |
772 |
|
773 |
int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, |
774 |
int host_port, struct in_addr guest_addr, int guest_port) |
775 |
{ |
776 |
if (!guest_addr.s_addr) {
|
777 |
guest_addr = slirp->vdhcp_startaddr; |
778 |
} |
779 |
if (is_udp) {
|
780 |
if (!udp_listen(slirp, host_addr.s_addr, htons(host_port),
|
781 |
guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) |
782 |
return -1; |
783 |
} else {
|
784 |
if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port),
|
785 |
guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) |
786 |
return -1; |
787 |
} |
788 |
return 0; |
789 |
} |
790 |
|
791 |
int slirp_add_exec(Slirp *slirp, int do_pty, const void *args, |
792 |
struct in_addr guest_addr, int guest_port) |
793 |
{ |
794 |
if (!guest_addr.s_addr) {
|
795 |
guest_addr.s_addr = slirp->vnetwork_addr.s_addr | |
796 |
(htonl(0x0204) & ~slirp->vnetwork_mask.s_addr);
|
797 |
} |
798 |
if ((guest_addr.s_addr & slirp->vnetwork_mask.s_addr) !=
|
799 |
slirp->vnetwork_addr.s_addr || |
800 |
guest_addr.s_addr == slirp->vhost_addr.s_addr || |
801 |
guest_addr.s_addr == slirp->vnameserver_addr.s_addr) { |
802 |
return -1; |
803 |
} |
804 |
return add_exec(&slirp->exec_list, do_pty, (char *)args, guest_addr, |
805 |
htons(guest_port)); |
806 |
} |
807 |
|
808 |
ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) |
809 |
{ |
810 |
if (so->s == -1 && so->extra) { |
811 |
qemu_chr_write(so->extra, buf, len); |
812 |
return len;
|
813 |
} |
814 |
|
815 |
return send(so->s, buf, len, flags);
|
816 |
} |
817 |
|
818 |
static struct socket * |
819 |
slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port) |
820 |
{ |
821 |
struct socket *so;
|
822 |
|
823 |
for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
|
824 |
if (so->so_faddr.s_addr == guest_addr.s_addr &&
|
825 |
htons(so->so_fport) == guest_port) { |
826 |
return so;
|
827 |
} |
828 |
} |
829 |
return NULL; |
830 |
} |
831 |
|
832 |
size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr,
|
833 |
int guest_port)
|
834 |
{ |
835 |
struct iovec iov[2]; |
836 |
struct socket *so;
|
837 |
|
838 |
so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); |
839 |
|
840 |
if (!so || so->so_state & SS_NOFDREF)
|
841 |
return 0; |
842 |
|
843 |
if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) |
844 |
return 0; |
845 |
|
846 |
return sopreprbuf(so, iov, NULL); |
847 |
} |
848 |
|
849 |
void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port, |
850 |
const uint8_t *buf, int size) |
851 |
{ |
852 |
int ret;
|
853 |
struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
|
854 |
|
855 |
if (!so)
|
856 |
return;
|
857 |
|
858 |
ret = soreadbuf(so, (const char *)buf, size); |
859 |
|
860 |
if (ret > 0) |
861 |
tcp_output(sototcpcb(so)); |
862 |
} |
863 |
|
864 |
static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp) |
865 |
{ |
866 |
int i;
|
867 |
|
868 |
qemu_put_sbe16(f, tp->t_state); |
869 |
for (i = 0; i < TCPT_NTIMERS; i++) |
870 |
qemu_put_sbe16(f, tp->t_timer[i]); |
871 |
qemu_put_sbe16(f, tp->t_rxtshift); |
872 |
qemu_put_sbe16(f, tp->t_rxtcur); |
873 |
qemu_put_sbe16(f, tp->t_dupacks); |
874 |
qemu_put_be16(f, tp->t_maxseg); |
875 |
qemu_put_sbyte(f, tp->t_force); |
876 |
qemu_put_be16(f, tp->t_flags); |
877 |
qemu_put_be32(f, tp->snd_una); |
878 |
qemu_put_be32(f, tp->snd_nxt); |
879 |
qemu_put_be32(f, tp->snd_up); |
880 |
qemu_put_be32(f, tp->snd_wl1); |
881 |
qemu_put_be32(f, tp->snd_wl2); |
882 |
qemu_put_be32(f, tp->iss); |
883 |
qemu_put_be32(f, tp->snd_wnd); |
884 |
qemu_put_be32(f, tp->rcv_wnd); |
885 |
qemu_put_be32(f, tp->rcv_nxt); |
886 |
qemu_put_be32(f, tp->rcv_up); |
887 |
qemu_put_be32(f, tp->irs); |
888 |
qemu_put_be32(f, tp->rcv_adv); |
889 |
qemu_put_be32(f, tp->snd_max); |
890 |
qemu_put_be32(f, tp->snd_cwnd); |
891 |
qemu_put_be32(f, tp->snd_ssthresh); |
892 |
qemu_put_sbe16(f, tp->t_idle); |
893 |
qemu_put_sbe16(f, tp->t_rtt); |
894 |
qemu_put_be32(f, tp->t_rtseq); |
895 |
qemu_put_sbe16(f, tp->t_srtt); |
896 |
qemu_put_sbe16(f, tp->t_rttvar); |
897 |
qemu_put_be16(f, tp->t_rttmin); |
898 |
qemu_put_be32(f, tp->max_sndwnd); |
899 |
qemu_put_byte(f, tp->t_oobflags); |
900 |
qemu_put_byte(f, tp->t_iobc); |
901 |
qemu_put_sbe16(f, tp->t_softerror); |
902 |
qemu_put_byte(f, tp->snd_scale); |
903 |
qemu_put_byte(f, tp->rcv_scale); |
904 |
qemu_put_byte(f, tp->request_r_scale); |
905 |
qemu_put_byte(f, tp->requested_s_scale); |
906 |
qemu_put_be32(f, tp->ts_recent); |
907 |
qemu_put_be32(f, tp->ts_recent_age); |
908 |
qemu_put_be32(f, tp->last_ack_sent); |
909 |
} |
910 |
|
911 |
static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) |
912 |
{ |
913 |
uint32_t off; |
914 |
|
915 |
qemu_put_be32(f, sbuf->sb_cc); |
916 |
qemu_put_be32(f, sbuf->sb_datalen); |
917 |
off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); |
918 |
qemu_put_sbe32(f, off); |
919 |
off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); |
920 |
qemu_put_sbe32(f, off); |
921 |
qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
922 |
} |
923 |
|
924 |
static void slirp_socket_save(QEMUFile *f, struct socket *so) |
925 |
{ |
926 |
qemu_put_be32(f, so->so_urgc); |
927 |
qemu_put_be32(f, so->so_faddr.s_addr); |
928 |
qemu_put_be32(f, so->so_laddr.s_addr); |
929 |
qemu_put_be16(f, so->so_fport); |
930 |
qemu_put_be16(f, so->so_lport); |
931 |
qemu_put_byte(f, so->so_iptos); |
932 |
qemu_put_byte(f, so->so_emu); |
933 |
qemu_put_byte(f, so->so_type); |
934 |
qemu_put_be32(f, so->so_state); |
935 |
slirp_sbuf_save(f, &so->so_rcv); |
936 |
slirp_sbuf_save(f, &so->so_snd); |
937 |
slirp_tcp_save(f, so->so_tcpcb); |
938 |
} |
939 |
|
940 |
static void slirp_state_save(QEMUFile *f, void *opaque) |
941 |
{ |
942 |
Slirp *slirp = opaque; |
943 |
struct ex_list *ex_ptr;
|
944 |
|
945 |
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
|
946 |
if (ex_ptr->ex_pty == 3) { |
947 |
struct socket *so;
|
948 |
so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr, |
949 |
ntohs(ex_ptr->ex_fport)); |
950 |
if (!so)
|
951 |
continue;
|
952 |
|
953 |
qemu_put_byte(f, 42);
|
954 |
slirp_socket_save(f, so); |
955 |
} |
956 |
qemu_put_byte(f, 0);
|
957 |
|
958 |
qemu_put_be16(f, slirp->ip_id); |
959 |
} |
960 |
|
961 |
static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp) |
962 |
{ |
963 |
int i;
|
964 |
|
965 |
tp->t_state = qemu_get_sbe16(f); |
966 |
for (i = 0; i < TCPT_NTIMERS; i++) |
967 |
tp->t_timer[i] = qemu_get_sbe16(f); |
968 |
tp->t_rxtshift = qemu_get_sbe16(f); |
969 |
tp->t_rxtcur = qemu_get_sbe16(f); |
970 |
tp->t_dupacks = qemu_get_sbe16(f); |
971 |
tp->t_maxseg = qemu_get_be16(f); |
972 |
tp->t_force = qemu_get_sbyte(f); |
973 |
tp->t_flags = qemu_get_be16(f); |
974 |
tp->snd_una = qemu_get_be32(f); |
975 |
tp->snd_nxt = qemu_get_be32(f); |
976 |
tp->snd_up = qemu_get_be32(f); |
977 |
tp->snd_wl1 = qemu_get_be32(f); |
978 |
tp->snd_wl2 = qemu_get_be32(f); |
979 |
tp->iss = qemu_get_be32(f); |
980 |
tp->snd_wnd = qemu_get_be32(f); |
981 |
tp->rcv_wnd = qemu_get_be32(f); |
982 |
tp->rcv_nxt = qemu_get_be32(f); |
983 |
tp->rcv_up = qemu_get_be32(f); |
984 |
tp->irs = qemu_get_be32(f); |
985 |
tp->rcv_adv = qemu_get_be32(f); |
986 |
tp->snd_max = qemu_get_be32(f); |
987 |
tp->snd_cwnd = qemu_get_be32(f); |
988 |
tp->snd_ssthresh = qemu_get_be32(f); |
989 |
tp->t_idle = qemu_get_sbe16(f); |
990 |
tp->t_rtt = qemu_get_sbe16(f); |
991 |
tp->t_rtseq = qemu_get_be32(f); |
992 |
tp->t_srtt = qemu_get_sbe16(f); |
993 |
tp->t_rttvar = qemu_get_sbe16(f); |
994 |
tp->t_rttmin = qemu_get_be16(f); |
995 |
tp->max_sndwnd = qemu_get_be32(f); |
996 |
tp->t_oobflags = qemu_get_byte(f); |
997 |
tp->t_iobc = qemu_get_byte(f); |
998 |
tp->t_softerror = qemu_get_sbe16(f); |
999 |
tp->snd_scale = qemu_get_byte(f); |
1000 |
tp->rcv_scale = qemu_get_byte(f); |
1001 |
tp->request_r_scale = qemu_get_byte(f); |
1002 |
tp->requested_s_scale = qemu_get_byte(f); |
1003 |
tp->ts_recent = qemu_get_be32(f); |
1004 |
tp->ts_recent_age = qemu_get_be32(f); |
1005 |
tp->last_ack_sent = qemu_get_be32(f); |
1006 |
tcp_template(tp); |
1007 |
} |
1008 |
|
1009 |
static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf) |
1010 |
{ |
1011 |
uint32_t off, sb_cc, sb_datalen; |
1012 |
|
1013 |
sb_cc = qemu_get_be32(f); |
1014 |
sb_datalen = qemu_get_be32(f); |
1015 |
|
1016 |
sbreserve(sbuf, sb_datalen); |
1017 |
|
1018 |
if (sbuf->sb_datalen != sb_datalen)
|
1019 |
return -ENOMEM;
|
1020 |
|
1021 |
sbuf->sb_cc = sb_cc; |
1022 |
|
1023 |
off = qemu_get_sbe32(f); |
1024 |
sbuf->sb_wptr = sbuf->sb_data + off; |
1025 |
off = qemu_get_sbe32(f); |
1026 |
sbuf->sb_rptr = sbuf->sb_data + off; |
1027 |
qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
1028 |
|
1029 |
return 0; |
1030 |
} |
1031 |
|
1032 |
static int slirp_socket_load(QEMUFile *f, struct socket *so) |
1033 |
{ |
1034 |
if (tcp_attach(so) < 0) |
1035 |
return -ENOMEM;
|
1036 |
|
1037 |
so->so_urgc = qemu_get_be32(f); |
1038 |
so->so_faddr.s_addr = qemu_get_be32(f); |
1039 |
so->so_laddr.s_addr = qemu_get_be32(f); |
1040 |
so->so_fport = qemu_get_be16(f); |
1041 |
so->so_lport = qemu_get_be16(f); |
1042 |
so->so_iptos = qemu_get_byte(f); |
1043 |
so->so_emu = qemu_get_byte(f); |
1044 |
so->so_type = qemu_get_byte(f); |
1045 |
so->so_state = qemu_get_be32(f); |
1046 |
if (slirp_sbuf_load(f, &so->so_rcv) < 0) |
1047 |
return -ENOMEM;
|
1048 |
if (slirp_sbuf_load(f, &so->so_snd) < 0) |
1049 |
return -ENOMEM;
|
1050 |
slirp_tcp_load(f, so->so_tcpcb); |
1051 |
|
1052 |
return 0; |
1053 |
} |
1054 |
|
1055 |
static int slirp_state_load(QEMUFile *f, void *opaque, int version_id) |
1056 |
{ |
1057 |
Slirp *slirp = opaque; |
1058 |
struct ex_list *ex_ptr;
|
1059 |
int r;
|
1060 |
|
1061 |
while ((r = qemu_get_byte(f))) {
|
1062 |
int ret;
|
1063 |
struct socket *so = socreate(slirp);
|
1064 |
|
1065 |
if (!so)
|
1066 |
return -ENOMEM;
|
1067 |
|
1068 |
ret = slirp_socket_load(f, so); |
1069 |
|
1070 |
if (ret < 0) |
1071 |
return ret;
|
1072 |
|
1073 |
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) !=
|
1074 |
slirp->vnetwork_addr.s_addr) { |
1075 |
return -EINVAL;
|
1076 |
} |
1077 |
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
1078 |
if (ex_ptr->ex_pty == 3 && |
1079 |
so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr && |
1080 |
so->so_fport == ex_ptr->ex_fport) { |
1081 |
break;
|
1082 |
} |
1083 |
} |
1084 |
if (!ex_ptr)
|
1085 |
return -EINVAL;
|
1086 |
|
1087 |
so->extra = (void *)ex_ptr->ex_exec;
|
1088 |
} |
1089 |
|
1090 |
if (version_id >= 2) { |
1091 |
slirp->ip_id = qemu_get_be16(f); |
1092 |
} |
1093 |
|
1094 |
return 0; |
1095 |
} |