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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-timer.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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|
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/* host loopback address */
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struct in_addr loopback_addr;
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|
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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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|
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static const uint8_t zero_ethaddr[6] = { 0, 0, 0, 0, 0, 0 }; |
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|
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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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|
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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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|
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static QTAILQ_HEAD(slirp_instances, Slirp) slirp_instances =
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QTAILQ_HEAD_INITIALIZER(slirp_instances); |
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|
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static struct in_addr dns_addr; |
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static u_int dns_addr_time;
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|
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#ifdef _WIN32
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|
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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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|
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if (dns_addr.s_addr != 0 && (curtime - dns_addr_time) < 1000) { |
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*pdns_addr = dns_addr; |
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return 0; |
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} |
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|
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FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO));
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BufLen = sizeof(FIXED_INFO);
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|
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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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|
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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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|
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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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dns_addr = tmp_addr; |
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dns_addr_time = curtime; |
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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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|
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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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|
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static struct stat dns_addr_stat; |
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|
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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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|
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if (dns_addr.s_addr != 0) { |
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struct stat old_stat;
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if ((curtime - dns_addr_time) < 1000) { |
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*pdns_addr = dns_addr; |
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return 0; |
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} |
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old_stat = dns_addr_stat; |
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if (stat("/etc/resolv.conf", &dns_addr_stat) != 0) |
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return -1; |
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if ((dns_addr_stat.st_dev == old_stat.st_dev)
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&& (dns_addr_stat.st_ino == old_stat.st_ino) |
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&& (dns_addr_stat.st_size == old_stat.st_size) |
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&& (dns_addr_stat.st_mtime == old_stat.st_mtime)) { |
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*pdns_addr = dns_addr; |
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return 0; |
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} |
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} |
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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 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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dns_addr = tmp_addr; |
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dns_addr_time = curtime; |
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} |
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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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#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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} |
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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, 3, slirp_state_save, slirp_state_load, slirp); |
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QTAILQ_INSERT_TAIL(&slirp_instances, slirp, entry); |
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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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QTAILQ_REMOVE(&slirp_instances, slirp, entry); |
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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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} |
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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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void slirp_select_fill(int *pnfds, |
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fd_set *readfds, fd_set *writefds, fd_set *xfds) |
259 |
{ |
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Slirp *slirp; |
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struct socket *so, *so_next;
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int nfds;
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263 |
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if (QTAILQ_EMPTY(&slirp_instances)) {
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return;
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} |
267 |
|
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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; |
274 |
/*
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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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QTAILQ_FOREACH(slirp, &slirp_instances, entry) { |
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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) || |
285 |
(&slirp->ipq.ip_link != slirp->ipq.ip_link.next)); |
286 |
|
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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; |
290 |
|
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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) |
295 |
time_fasttimo = curtime; /* Flag when we want a fasttimo */
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296 |
|
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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) |
302 |
continue;
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303 |
|
304 |
/*
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305 |
* 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); |
309 |
UPD_NFDS(so->s); |
310 |
continue;
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} |
312 |
|
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/*
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* Set for writing sockets which are connecting
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315 |
*/
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316 |
if (so->so_state & SS_ISFCONNECTING) {
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317 |
FD_SET(so->s, writefds); |
318 |
UPD_NFDS(so->s); |
319 |
continue;
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320 |
} |
321 |
|
322 |
/*
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* Set for writing if we are connected, can send more, and
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324 |
* we have something to send
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*/
|
326 |
if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
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FD_SET(so->s, writefds); |
328 |
UPD_NFDS(so->s); |
329 |
} |
330 |
|
331 |
/*
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332 |
* 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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335 |
if (CONN_CANFRCV(so) && (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) { |
336 |
FD_SET(so->s, readfds); |
337 |
FD_SET(so->s, xfds); |
338 |
UPD_NFDS(so->s); |
339 |
} |
340 |
} |
341 |
|
342 |
/*
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343 |
* UDP sockets
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344 |
*/
|
345 |
for (so = slirp->udb.so_next; so != &slirp->udb;
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346 |
so = so_next) { |
347 |
so_next = so->so_next; |
348 |
|
349 |
/*
|
350 |
* See if it's timed out
|
351 |
*/
|
352 |
if (so->so_expire) {
|
353 |
if (so->so_expire <= curtime) {
|
354 |
udp_detach(so); |
355 |
continue;
|
356 |
} else
|
357 |
do_slowtimo = 1; /* Let socket expire */ |
358 |
} |
359 |
|
360 |
/*
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361 |
* When UDP packets are received from over the
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362 |
* link, they're sendto()'d straight away, so
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363 |
* no need for setting for writing
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364 |
* Limit the number of packets queued by this session
|
365 |
* to 4. Note that even though we try and limit this
|
366 |
* to 4 packets, the session could have more queued
|
367 |
* if the packets needed to be fragmented
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368 |
* (XXX <= 4 ?)
|
369 |
*/
|
370 |
if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { |
371 |
FD_SET(so->s, readfds); |
372 |
UPD_NFDS(so->s); |
373 |
} |
374 |
} |
375 |
} |
376 |
|
377 |
*pnfds = nfds; |
378 |
} |
379 |
|
380 |
void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds,
|
381 |
int select_error)
|
382 |
{ |
383 |
Slirp *slirp; |
384 |
struct socket *so, *so_next;
|
385 |
int ret;
|
386 |
|
387 |
if (QTAILQ_EMPTY(&slirp_instances)) {
|
388 |
return;
|
389 |
} |
390 |
|
391 |
global_readfds = readfds; |
392 |
global_writefds = writefds; |
393 |
global_xfds = xfds; |
394 |
|
395 |
curtime = qemu_get_clock(rt_clock); |
396 |
|
397 |
QTAILQ_FOREACH(slirp, &slirp_instances, entry) { |
398 |
/*
|
399 |
* See if anything has timed out
|
400 |
*/
|
401 |
if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) { |
402 |
tcp_fasttimo(slirp); |
403 |
time_fasttimo = 0;
|
404 |
} |
405 |
if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) { |
406 |
ip_slowtimo(slirp); |
407 |
tcp_slowtimo(slirp); |
408 |
last_slowtimo = curtime; |
409 |
} |
410 |
|
411 |
/*
|
412 |
* Check sockets
|
413 |
*/
|
414 |
if (!select_error) {
|
415 |
/*
|
416 |
* Check TCP sockets
|
417 |
*/
|
418 |
for (so = slirp->tcb.so_next; so != &slirp->tcb;
|
419 |
so = so_next) { |
420 |
so_next = so->so_next; |
421 |
|
422 |
/*
|
423 |
* FD_ISSET is meaningless on these sockets
|
424 |
* (and they can crash the program)
|
425 |
*/
|
426 |
if (so->so_state & SS_NOFDREF || so->s == -1) |
427 |
continue;
|
428 |
|
429 |
/*
|
430 |
* Check for URG data
|
431 |
* This will soread as well, so no need to
|
432 |
* test for readfds below if this succeeds
|
433 |
*/
|
434 |
if (FD_ISSET(so->s, xfds))
|
435 |
sorecvoob(so); |
436 |
/*
|
437 |
* Check sockets for reading
|
438 |
*/
|
439 |
else if (FD_ISSET(so->s, readfds)) { |
440 |
/*
|
441 |
* Check for incoming connections
|
442 |
*/
|
443 |
if (so->so_state & SS_FACCEPTCONN) {
|
444 |
tcp_connect(so); |
445 |
continue;
|
446 |
} /* else */
|
447 |
ret = soread(so); |
448 |
|
449 |
/* Output it if we read something */
|
450 |
if (ret > 0) |
451 |
tcp_output(sototcpcb(so)); |
452 |
} |
453 |
|
454 |
/*
|
455 |
* Check sockets for writing
|
456 |
*/
|
457 |
if (FD_ISSET(so->s, writefds)) {
|
458 |
/*
|
459 |
* Check for non-blocking, still-connecting sockets
|
460 |
*/
|
461 |
if (so->so_state & SS_ISFCONNECTING) {
|
462 |
/* Connected */
|
463 |
so->so_state &= ~SS_ISFCONNECTING; |
464 |
|
465 |
ret = send(so->s, (const void *) &ret, 0, 0); |
466 |
if (ret < 0) { |
467 |
/* XXXXX Must fix, zero bytes is a NOP */
|
468 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
469 |
errno == EINPROGRESS || errno == ENOTCONN) |
470 |
continue;
|
471 |
|
472 |
/* else failed */
|
473 |
so->so_state &= SS_PERSISTENT_MASK; |
474 |
so->so_state |= SS_NOFDREF; |
475 |
} |
476 |
/* else so->so_state &= ~SS_ISFCONNECTING; */
|
477 |
|
478 |
/*
|
479 |
* Continue tcp_input
|
480 |
*/
|
481 |
tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); |
482 |
/* continue; */
|
483 |
} else
|
484 |
ret = sowrite(so); |
485 |
/*
|
486 |
* XXXXX If we wrote something (a lot), there
|
487 |
* could be a need for a window update.
|
488 |
* In the worst case, the remote will send
|
489 |
* a window probe to get things going again
|
490 |
*/
|
491 |
} |
492 |
|
493 |
/*
|
494 |
* Probe a still-connecting, non-blocking socket
|
495 |
* to check if it's still alive
|
496 |
*/
|
497 |
#ifdef PROBE_CONN
|
498 |
if (so->so_state & SS_ISFCONNECTING) {
|
499 |
ret = recv(so->s, (char *)&ret, 0,0); |
500 |
|
501 |
if (ret < 0) { |
502 |
/* XXX */
|
503 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
504 |
errno == EINPROGRESS || errno == ENOTCONN) |
505 |
continue; /* Still connecting, continue */ |
506 |
|
507 |
/* else failed */
|
508 |
so->so_state &= SS_PERSISTENT_MASK; |
509 |
so->so_state |= SS_NOFDREF; |
510 |
|
511 |
/* tcp_input will take care of it */
|
512 |
} else {
|
513 |
ret = send(so->s, &ret, 0,0); |
514 |
if (ret < 0) { |
515 |
/* XXX */
|
516 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
517 |
errno == EINPROGRESS || errno == ENOTCONN) |
518 |
continue;
|
519 |
/* else failed */
|
520 |
so->so_state &= SS_PERSISTENT_MASK; |
521 |
so->so_state |= SS_NOFDREF; |
522 |
} else
|
523 |
so->so_state &= ~SS_ISFCONNECTING; |
524 |
|
525 |
} |
526 |
tcp_input((struct mbuf *)NULL, sizeof(struct ip),so); |
527 |
} /* SS_ISFCONNECTING */
|
528 |
#endif
|
529 |
} |
530 |
|
531 |
/*
|
532 |
* Now UDP sockets.
|
533 |
* Incoming packets are sent straight away, they're not buffered.
|
534 |
* Incoming UDP data isn't buffered either.
|
535 |
*/
|
536 |
for (so = slirp->udb.so_next; so != &slirp->udb;
|
537 |
so = so_next) { |
538 |
so_next = so->so_next; |
539 |
|
540 |
if (so->s != -1 && FD_ISSET(so->s, readfds)) { |
541 |
sorecvfrom(so); |
542 |
} |
543 |
} |
544 |
} |
545 |
|
546 |
/*
|
547 |
* See if we can start outputting
|
548 |
*/
|
549 |
if (slirp->if_queued) {
|
550 |
if_start(slirp); |
551 |
} |
552 |
} |
553 |
|
554 |
/* clear global file descriptor sets.
|
555 |
* these reside on the stack in vl.c
|
556 |
* so they're unusable if we're not in
|
557 |
* slirp_select_fill or slirp_select_poll.
|
558 |
*/
|
559 |
global_readfds = NULL;
|
560 |
global_writefds = NULL;
|
561 |
global_xfds = NULL;
|
562 |
} |
563 |
|
564 |
#define ETH_ALEN 6 |
565 |
#define ETH_HLEN 14 |
566 |
|
567 |
#define ETH_P_IP 0x0800 /* Internet Protocol packet */ |
568 |
#define ETH_P_ARP 0x0806 /* Address Resolution packet */ |
569 |
|
570 |
#define ARPOP_REQUEST 1 /* ARP request */ |
571 |
#define ARPOP_REPLY 2 /* ARP reply */ |
572 |
|
573 |
struct ethhdr
|
574 |
{ |
575 |
unsigned char h_dest[ETH_ALEN]; /* destination eth addr */ |
576 |
unsigned char h_source[ETH_ALEN]; /* source ether addr */ |
577 |
unsigned short h_proto; /* packet type ID field */ |
578 |
}; |
579 |
|
580 |
struct arphdr
|
581 |
{ |
582 |
unsigned short ar_hrd; /* format of hardware address */ |
583 |
unsigned short ar_pro; /* format of protocol address */ |
584 |
unsigned char ar_hln; /* length of hardware address */ |
585 |
unsigned char ar_pln; /* length of protocol address */ |
586 |
unsigned short ar_op; /* ARP opcode (command) */ |
587 |
|
588 |
/*
|
589 |
* Ethernet looks like this : This bit is variable sized however...
|
590 |
*/
|
591 |
unsigned char ar_sha[ETH_ALEN]; /* sender hardware address */ |
592 |
uint32_t ar_sip; /* sender IP address */
|
593 |
unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ |
594 |
uint32_t ar_tip ; /* target IP address */
|
595 |
} __attribute__((packed)); |
596 |
|
597 |
static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) |
598 |
{ |
599 |
struct ethhdr *eh = (struct ethhdr *)pkt; |
600 |
struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN); |
601 |
uint8_t arp_reply[ETH_HLEN + sizeof(struct arphdr)]; |
602 |
struct ethhdr *reh = (struct ethhdr *)arp_reply; |
603 |
struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN); |
604 |
int ar_op;
|
605 |
struct ex_list *ex_ptr;
|
606 |
|
607 |
ar_op = ntohs(ah->ar_op); |
608 |
switch(ar_op) {
|
609 |
case ARPOP_REQUEST:
|
610 |
if ((ah->ar_tip & slirp->vnetwork_mask.s_addr) ==
|
611 |
slirp->vnetwork_addr.s_addr) { |
612 |
if (ah->ar_tip == slirp->vnameserver_addr.s_addr ||
|
613 |
ah->ar_tip == slirp->vhost_addr.s_addr) |
614 |
goto arp_ok;
|
615 |
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
616 |
if (ex_ptr->ex_addr.s_addr == ah->ar_tip)
|
617 |
goto arp_ok;
|
618 |
} |
619 |
return;
|
620 |
arp_ok:
|
621 |
/* XXX: make an ARP request to have the client address */
|
622 |
memcpy(slirp->client_ethaddr, eh->h_source, ETH_ALEN); |
623 |
|
624 |
/* ARP request for alias/dns mac address */
|
625 |
memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); |
626 |
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
|
627 |
memcpy(&reh->h_source[2], &ah->ar_tip, 4); |
628 |
reh->h_proto = htons(ETH_P_ARP); |
629 |
|
630 |
rah->ar_hrd = htons(1);
|
631 |
rah->ar_pro = htons(ETH_P_IP); |
632 |
rah->ar_hln = ETH_ALEN; |
633 |
rah->ar_pln = 4;
|
634 |
rah->ar_op = htons(ARPOP_REPLY); |
635 |
memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); |
636 |
rah->ar_sip = ah->ar_tip; |
637 |
memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); |
638 |
rah->ar_tip = ah->ar_sip; |
639 |
slirp_output(slirp->opaque, arp_reply, sizeof(arp_reply));
|
640 |
} |
641 |
break;
|
642 |
case ARPOP_REPLY:
|
643 |
/* reply to request of client mac address ? */
|
644 |
if (!memcmp(slirp->client_ethaddr, zero_ethaddr, ETH_ALEN) &&
|
645 |
ah->ar_sip == slirp->client_ipaddr.s_addr) { |
646 |
memcpy(slirp->client_ethaddr, ah->ar_sha, ETH_ALEN); |
647 |
} |
648 |
break;
|
649 |
default:
|
650 |
break;
|
651 |
} |
652 |
} |
653 |
|
654 |
void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) |
655 |
{ |
656 |
struct mbuf *m;
|
657 |
int proto;
|
658 |
|
659 |
if (pkt_len < ETH_HLEN)
|
660 |
return;
|
661 |
|
662 |
proto = ntohs(*(uint16_t *)(pkt + 12));
|
663 |
switch(proto) {
|
664 |
case ETH_P_ARP:
|
665 |
arp_input(slirp, pkt, pkt_len); |
666 |
break;
|
667 |
case ETH_P_IP:
|
668 |
m = m_get(slirp); |
669 |
if (!m)
|
670 |
return;
|
671 |
/* Note: we add to align the IP header */
|
672 |
if (M_FREEROOM(m) < pkt_len + 2) { |
673 |
m_inc(m, pkt_len + 2);
|
674 |
} |
675 |
m->m_len = pkt_len + 2;
|
676 |
memcpy(m->m_data + 2, pkt, pkt_len);
|
677 |
|
678 |
m->m_data += 2 + ETH_HLEN;
|
679 |
m->m_len -= 2 + ETH_HLEN;
|
680 |
|
681 |
ip_input(m); |
682 |
break;
|
683 |
default:
|
684 |
break;
|
685 |
} |
686 |
} |
687 |
|
688 |
/* output the IP packet to the ethernet device */
|
689 |
void if_encap(Slirp *slirp, const uint8_t *ip_data, int ip_data_len) |
690 |
{ |
691 |
uint8_t buf[1600];
|
692 |
struct ethhdr *eh = (struct ethhdr *)buf; |
693 |
|
694 |
if (ip_data_len + ETH_HLEN > sizeof(buf)) |
695 |
return;
|
696 |
|
697 |
if (!memcmp(slirp->client_ethaddr, zero_ethaddr, ETH_ALEN)) {
|
698 |
uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; |
699 |
struct ethhdr *reh = (struct ethhdr *)arp_req; |
700 |
struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); |
701 |
const struct ip *iph = (const struct ip *)ip_data; |
702 |
|
703 |
/* If the client addr is not known, there is no point in
|
704 |
sending the packet to it. Normally the sender should have
|
705 |
done an ARP request to get its MAC address. Here we do it
|
706 |
in place of sending the packet and we hope that the sender
|
707 |
will retry sending its packet. */
|
708 |
memset(reh->h_dest, 0xff, ETH_ALEN);
|
709 |
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4);
|
710 |
memcpy(&reh->h_source[2], &slirp->vhost_addr, 4); |
711 |
reh->h_proto = htons(ETH_P_ARP); |
712 |
rah->ar_hrd = htons(1);
|
713 |
rah->ar_pro = htons(ETH_P_IP); |
714 |
rah->ar_hln = ETH_ALEN; |
715 |
rah->ar_pln = 4;
|
716 |
rah->ar_op = htons(ARPOP_REQUEST); |
717 |
/* source hw addr */
|
718 |
memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 4);
|
719 |
memcpy(&rah->ar_sha[2], &slirp->vhost_addr, 4); |
720 |
/* source IP */
|
721 |
rah->ar_sip = slirp->vhost_addr.s_addr; |
722 |
/* target hw addr (none) */
|
723 |
memset(rah->ar_tha, 0, ETH_ALEN);
|
724 |
/* target IP */
|
725 |
rah->ar_tip = iph->ip_dst.s_addr; |
726 |
slirp->client_ipaddr = iph->ip_dst; |
727 |
slirp_output(slirp->opaque, arp_req, sizeof(arp_req));
|
728 |
} else {
|
729 |
memcpy(eh->h_dest, slirp->client_ethaddr, ETH_ALEN); |
730 |
memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4);
|
731 |
/* XXX: not correct */
|
732 |
memcpy(&eh->h_source[2], &slirp->vhost_addr, 4); |
733 |
eh->h_proto = htons(ETH_P_IP); |
734 |
memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len); |
735 |
slirp_output(slirp->opaque, buf, ip_data_len + ETH_HLEN); |
736 |
} |
737 |
} |
738 |
|
739 |
/* Drop host forwarding rule, return 0 if found. */
|
740 |
int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, |
741 |
int host_port)
|
742 |
{ |
743 |
struct socket *so;
|
744 |
struct socket *head = (is_udp ? &slirp->udb : &slirp->tcb);
|
745 |
struct sockaddr_in addr;
|
746 |
int port = htons(host_port);
|
747 |
socklen_t addr_len; |
748 |
|
749 |
for (so = head->so_next; so != head; so = so->so_next) {
|
750 |
addr_len = sizeof(addr);
|
751 |
if ((so->so_state & SS_HOSTFWD) &&
|
752 |
getsockname(so->s, (struct sockaddr *)&addr, &addr_len) == 0 && |
753 |
addr.sin_addr.s_addr == host_addr.s_addr && |
754 |
addr.sin_port == port) { |
755 |
close(so->s); |
756 |
sofree(so); |
757 |
return 0; |
758 |
} |
759 |
} |
760 |
|
761 |
return -1; |
762 |
} |
763 |
|
764 |
int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, |
765 |
int host_port, struct in_addr guest_addr, int guest_port) |
766 |
{ |
767 |
if (!guest_addr.s_addr) {
|
768 |
guest_addr = slirp->vdhcp_startaddr; |
769 |
} |
770 |
if (is_udp) {
|
771 |
if (!udp_listen(slirp, host_addr.s_addr, htons(host_port),
|
772 |
guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) |
773 |
return -1; |
774 |
} else {
|
775 |
if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port),
|
776 |
guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) |
777 |
return -1; |
778 |
} |
779 |
return 0; |
780 |
} |
781 |
|
782 |
int slirp_add_exec(Slirp *slirp, int do_pty, const void *args, |
783 |
struct in_addr *guest_addr, int guest_port) |
784 |
{ |
785 |
if (!guest_addr->s_addr) {
|
786 |
guest_addr->s_addr = slirp->vnetwork_addr.s_addr | |
787 |
(htonl(0x0204) & ~slirp->vnetwork_mask.s_addr);
|
788 |
} |
789 |
if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) !=
|
790 |
slirp->vnetwork_addr.s_addr || |
791 |
guest_addr->s_addr == slirp->vhost_addr.s_addr || |
792 |
guest_addr->s_addr == slirp->vnameserver_addr.s_addr) { |
793 |
return -1; |
794 |
} |
795 |
return add_exec(&slirp->exec_list, do_pty, (char *)args, *guest_addr, |
796 |
htons(guest_port)); |
797 |
} |
798 |
|
799 |
ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) |
800 |
{ |
801 |
if (so->s == -1 && so->extra) { |
802 |
qemu_chr_write(so->extra, buf, len); |
803 |
return len;
|
804 |
} |
805 |
|
806 |
return send(so->s, buf, len, flags);
|
807 |
} |
808 |
|
809 |
static struct socket * |
810 |
slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port) |
811 |
{ |
812 |
struct socket *so;
|
813 |
|
814 |
for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) {
|
815 |
if (so->so_faddr.s_addr == guest_addr.s_addr &&
|
816 |
htons(so->so_fport) == guest_port) { |
817 |
return so;
|
818 |
} |
819 |
} |
820 |
return NULL; |
821 |
} |
822 |
|
823 |
size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr,
|
824 |
int guest_port)
|
825 |
{ |
826 |
struct iovec iov[2]; |
827 |
struct socket *so;
|
828 |
|
829 |
so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); |
830 |
|
831 |
if (!so || so->so_state & SS_NOFDREF)
|
832 |
return 0; |
833 |
|
834 |
if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) |
835 |
return 0; |
836 |
|
837 |
return sopreprbuf(so, iov, NULL); |
838 |
} |
839 |
|
840 |
void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port, |
841 |
const uint8_t *buf, int size) |
842 |
{ |
843 |
int ret;
|
844 |
struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port);
|
845 |
|
846 |
if (!so)
|
847 |
return;
|
848 |
|
849 |
ret = soreadbuf(so, (const char *)buf, size); |
850 |
|
851 |
if (ret > 0) |
852 |
tcp_output(sototcpcb(so)); |
853 |
} |
854 |
|
855 |
static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp) |
856 |
{ |
857 |
int i;
|
858 |
|
859 |
qemu_put_sbe16(f, tp->t_state); |
860 |
for (i = 0; i < TCPT_NTIMERS; i++) |
861 |
qemu_put_sbe16(f, tp->t_timer[i]); |
862 |
qemu_put_sbe16(f, tp->t_rxtshift); |
863 |
qemu_put_sbe16(f, tp->t_rxtcur); |
864 |
qemu_put_sbe16(f, tp->t_dupacks); |
865 |
qemu_put_be16(f, tp->t_maxseg); |
866 |
qemu_put_sbyte(f, tp->t_force); |
867 |
qemu_put_be16(f, tp->t_flags); |
868 |
qemu_put_be32(f, tp->snd_una); |
869 |
qemu_put_be32(f, tp->snd_nxt); |
870 |
qemu_put_be32(f, tp->snd_up); |
871 |
qemu_put_be32(f, tp->snd_wl1); |
872 |
qemu_put_be32(f, tp->snd_wl2); |
873 |
qemu_put_be32(f, tp->iss); |
874 |
qemu_put_be32(f, tp->snd_wnd); |
875 |
qemu_put_be32(f, tp->rcv_wnd); |
876 |
qemu_put_be32(f, tp->rcv_nxt); |
877 |
qemu_put_be32(f, tp->rcv_up); |
878 |
qemu_put_be32(f, tp->irs); |
879 |
qemu_put_be32(f, tp->rcv_adv); |
880 |
qemu_put_be32(f, tp->snd_max); |
881 |
qemu_put_be32(f, tp->snd_cwnd); |
882 |
qemu_put_be32(f, tp->snd_ssthresh); |
883 |
qemu_put_sbe16(f, tp->t_idle); |
884 |
qemu_put_sbe16(f, tp->t_rtt); |
885 |
qemu_put_be32(f, tp->t_rtseq); |
886 |
qemu_put_sbe16(f, tp->t_srtt); |
887 |
qemu_put_sbe16(f, tp->t_rttvar); |
888 |
qemu_put_be16(f, tp->t_rttmin); |
889 |
qemu_put_be32(f, tp->max_sndwnd); |
890 |
qemu_put_byte(f, tp->t_oobflags); |
891 |
qemu_put_byte(f, tp->t_iobc); |
892 |
qemu_put_sbe16(f, tp->t_softerror); |
893 |
qemu_put_byte(f, tp->snd_scale); |
894 |
qemu_put_byte(f, tp->rcv_scale); |
895 |
qemu_put_byte(f, tp->request_r_scale); |
896 |
qemu_put_byte(f, tp->requested_s_scale); |
897 |
qemu_put_be32(f, tp->ts_recent); |
898 |
qemu_put_be32(f, tp->ts_recent_age); |
899 |
qemu_put_be32(f, tp->last_ack_sent); |
900 |
} |
901 |
|
902 |
static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) |
903 |
{ |
904 |
uint32_t off; |
905 |
|
906 |
qemu_put_be32(f, sbuf->sb_cc); |
907 |
qemu_put_be32(f, sbuf->sb_datalen); |
908 |
off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); |
909 |
qemu_put_sbe32(f, off); |
910 |
off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); |
911 |
qemu_put_sbe32(f, off); |
912 |
qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
913 |
} |
914 |
|
915 |
static void slirp_socket_save(QEMUFile *f, struct socket *so) |
916 |
{ |
917 |
qemu_put_be32(f, so->so_urgc); |
918 |
qemu_put_be32(f, so->so_faddr.s_addr); |
919 |
qemu_put_be32(f, so->so_laddr.s_addr); |
920 |
qemu_put_be16(f, so->so_fport); |
921 |
qemu_put_be16(f, so->so_lport); |
922 |
qemu_put_byte(f, so->so_iptos); |
923 |
qemu_put_byte(f, so->so_emu); |
924 |
qemu_put_byte(f, so->so_type); |
925 |
qemu_put_be32(f, so->so_state); |
926 |
slirp_sbuf_save(f, &so->so_rcv); |
927 |
slirp_sbuf_save(f, &so->so_snd); |
928 |
slirp_tcp_save(f, so->so_tcpcb); |
929 |
} |
930 |
|
931 |
static void slirp_bootp_save(QEMUFile *f, Slirp *slirp) |
932 |
{ |
933 |
int i;
|
934 |
|
935 |
for (i = 0; i < NB_BOOTP_CLIENTS; i++) { |
936 |
qemu_put_be16(f, slirp->bootp_clients[i].allocated); |
937 |
qemu_put_buffer(f, slirp->bootp_clients[i].macaddr, 6);
|
938 |
} |
939 |
} |
940 |
|
941 |
static void slirp_state_save(QEMUFile *f, void *opaque) |
942 |
{ |
943 |
Slirp *slirp = opaque; |
944 |
struct ex_list *ex_ptr;
|
945 |
|
946 |
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
|
947 |
if (ex_ptr->ex_pty == 3) { |
948 |
struct socket *so;
|
949 |
so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr, |
950 |
ntohs(ex_ptr->ex_fport)); |
951 |
if (!so)
|
952 |
continue;
|
953 |
|
954 |
qemu_put_byte(f, 42);
|
955 |
slirp_socket_save(f, so); |
956 |
} |
957 |
qemu_put_byte(f, 0);
|
958 |
|
959 |
qemu_put_be16(f, slirp->ip_id); |
960 |
|
961 |
slirp_bootp_save(f, slirp); |
962 |
} |
963 |
|
964 |
static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp) |
965 |
{ |
966 |
int i;
|
967 |
|
968 |
tp->t_state = qemu_get_sbe16(f); |
969 |
for (i = 0; i < TCPT_NTIMERS; i++) |
970 |
tp->t_timer[i] = qemu_get_sbe16(f); |
971 |
tp->t_rxtshift = qemu_get_sbe16(f); |
972 |
tp->t_rxtcur = qemu_get_sbe16(f); |
973 |
tp->t_dupacks = qemu_get_sbe16(f); |
974 |
tp->t_maxseg = qemu_get_be16(f); |
975 |
tp->t_force = qemu_get_sbyte(f); |
976 |
tp->t_flags = qemu_get_be16(f); |
977 |
tp->snd_una = qemu_get_be32(f); |
978 |
tp->snd_nxt = qemu_get_be32(f); |
979 |
tp->snd_up = qemu_get_be32(f); |
980 |
tp->snd_wl1 = qemu_get_be32(f); |
981 |
tp->snd_wl2 = qemu_get_be32(f); |
982 |
tp->iss = qemu_get_be32(f); |
983 |
tp->snd_wnd = qemu_get_be32(f); |
984 |
tp->rcv_wnd = qemu_get_be32(f); |
985 |
tp->rcv_nxt = qemu_get_be32(f); |
986 |
tp->rcv_up = qemu_get_be32(f); |
987 |
tp->irs = qemu_get_be32(f); |
988 |
tp->rcv_adv = qemu_get_be32(f); |
989 |
tp->snd_max = qemu_get_be32(f); |
990 |
tp->snd_cwnd = qemu_get_be32(f); |
991 |
tp->snd_ssthresh = qemu_get_be32(f); |
992 |
tp->t_idle = qemu_get_sbe16(f); |
993 |
tp->t_rtt = qemu_get_sbe16(f); |
994 |
tp->t_rtseq = qemu_get_be32(f); |
995 |
tp->t_srtt = qemu_get_sbe16(f); |
996 |
tp->t_rttvar = qemu_get_sbe16(f); |
997 |
tp->t_rttmin = qemu_get_be16(f); |
998 |
tp->max_sndwnd = qemu_get_be32(f); |
999 |
tp->t_oobflags = qemu_get_byte(f); |
1000 |
tp->t_iobc = qemu_get_byte(f); |
1001 |
tp->t_softerror = qemu_get_sbe16(f); |
1002 |
tp->snd_scale = qemu_get_byte(f); |
1003 |
tp->rcv_scale = qemu_get_byte(f); |
1004 |
tp->request_r_scale = qemu_get_byte(f); |
1005 |
tp->requested_s_scale = qemu_get_byte(f); |
1006 |
tp->ts_recent = qemu_get_be32(f); |
1007 |
tp->ts_recent_age = qemu_get_be32(f); |
1008 |
tp->last_ack_sent = qemu_get_be32(f); |
1009 |
tcp_template(tp); |
1010 |
} |
1011 |
|
1012 |
static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf) |
1013 |
{ |
1014 |
uint32_t off, sb_cc, sb_datalen; |
1015 |
|
1016 |
sb_cc = qemu_get_be32(f); |
1017 |
sb_datalen = qemu_get_be32(f); |
1018 |
|
1019 |
sbreserve(sbuf, sb_datalen); |
1020 |
|
1021 |
if (sbuf->sb_datalen != sb_datalen)
|
1022 |
return -ENOMEM;
|
1023 |
|
1024 |
sbuf->sb_cc = sb_cc; |
1025 |
|
1026 |
off = qemu_get_sbe32(f); |
1027 |
sbuf->sb_wptr = sbuf->sb_data + off; |
1028 |
off = qemu_get_sbe32(f); |
1029 |
sbuf->sb_rptr = sbuf->sb_data + off; |
1030 |
qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
1031 |
|
1032 |
return 0; |
1033 |
} |
1034 |
|
1035 |
static int slirp_socket_load(QEMUFile *f, struct socket *so) |
1036 |
{ |
1037 |
if (tcp_attach(so) < 0) |
1038 |
return -ENOMEM;
|
1039 |
|
1040 |
so->so_urgc = qemu_get_be32(f); |
1041 |
so->so_faddr.s_addr = qemu_get_be32(f); |
1042 |
so->so_laddr.s_addr = qemu_get_be32(f); |
1043 |
so->so_fport = qemu_get_be16(f); |
1044 |
so->so_lport = qemu_get_be16(f); |
1045 |
so->so_iptos = qemu_get_byte(f); |
1046 |
so->so_emu = qemu_get_byte(f); |
1047 |
so->so_type = qemu_get_byte(f); |
1048 |
so->so_state = qemu_get_be32(f); |
1049 |
if (slirp_sbuf_load(f, &so->so_rcv) < 0) |
1050 |
return -ENOMEM;
|
1051 |
if (slirp_sbuf_load(f, &so->so_snd) < 0) |
1052 |
return -ENOMEM;
|
1053 |
slirp_tcp_load(f, so->so_tcpcb); |
1054 |
|
1055 |
return 0; |
1056 |
} |
1057 |
|
1058 |
static void slirp_bootp_load(QEMUFile *f, Slirp *slirp) |
1059 |
{ |
1060 |
int i;
|
1061 |
|
1062 |
for (i = 0; i < NB_BOOTP_CLIENTS; i++) { |
1063 |
slirp->bootp_clients[i].allocated = qemu_get_be16(f); |
1064 |
qemu_get_buffer(f, slirp->bootp_clients[i].macaddr, 6);
|
1065 |
} |
1066 |
} |
1067 |
|
1068 |
static int slirp_state_load(QEMUFile *f, void *opaque, int version_id) |
1069 |
{ |
1070 |
Slirp *slirp = opaque; |
1071 |
struct ex_list *ex_ptr;
|
1072 |
int r;
|
1073 |
|
1074 |
while ((r = qemu_get_byte(f))) {
|
1075 |
int ret;
|
1076 |
struct socket *so = socreate(slirp);
|
1077 |
|
1078 |
if (!so)
|
1079 |
return -ENOMEM;
|
1080 |
|
1081 |
ret = slirp_socket_load(f, so); |
1082 |
|
1083 |
if (ret < 0) |
1084 |
return ret;
|
1085 |
|
1086 |
if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) !=
|
1087 |
slirp->vnetwork_addr.s_addr) { |
1088 |
return -EINVAL;
|
1089 |
} |
1090 |
for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
1091 |
if (ex_ptr->ex_pty == 3 && |
1092 |
so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr && |
1093 |
so->so_fport == ex_ptr->ex_fport) { |
1094 |
break;
|
1095 |
} |
1096 |
} |
1097 |
if (!ex_ptr)
|
1098 |
return -EINVAL;
|
1099 |
|
1100 |
so->extra = (void *)ex_ptr->ex_exec;
|
1101 |
} |
1102 |
|
1103 |
if (version_id >= 2) { |
1104 |
slirp->ip_id = qemu_get_be16(f); |
1105 |
} |
1106 |
|
1107 |
if (version_id >= 3) { |
1108 |
slirp_bootp_load(f, slirp); |
1109 |
} |
1110 |
|
1111 |
return 0; |
1112 |
} |