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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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|
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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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|
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/* address for slirp virtual addresses */
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struct in_addr special_addr;
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/* virtual address alias for host */
|
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struct in_addr alias_addr;
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|
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static const uint8_t special_ethaddr[6] = { |
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0x52, 0x54, 0x00, 0x12, 0x35, 0x00 |
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}; |
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|
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/* ARP cache for the guest IP addresses (XXX: allow many entries) */
|
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uint8_t client_ethaddr[6];
|
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static struct in_addr client_ipaddr; |
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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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const char *slirp_special_ip = CTL_SPECIAL; |
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int slirp_restrict;
|
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int do_slowtimo;
|
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int link_up;
|
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struct timeval tt;
|
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FILE *lfd; |
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struct ex_list *exec_list;
|
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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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char slirp_hostname[33]; |
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|
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#ifdef _WIN32
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|
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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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|
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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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#if 0
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printf( "DNS Servers:\n" );
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printf( "DNS Addr:%s\n", pIPAddr->IpAddress.String );
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|
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pIPAddr = FixedInfo -> DnsServerList.Next;
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while ( pIPAddr ) {
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printf( "DNS Addr:%s\n", pIPAddr ->IpAddress.String );
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pIPAddr = pIPAddr ->Next;
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}
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#endif
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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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#else
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|
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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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|
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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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|
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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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|
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#endif
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|
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#ifdef _WIN32
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static void slirp_cleanup(void) |
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{
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WSACleanup(); |
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} |
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#endif
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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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|
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void slirp_init(int restrict, char *special_ip) |
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{
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// debug_init("/tmp/slirp.log", DEBUG_DEFAULT);
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#ifdef _WIN32
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{
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WSADATA Data; |
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WSAStartup(MAKEWORD(2,0), &Data); |
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atexit(slirp_cleanup); |
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} |
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#endif
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|
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link_up = 1;
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slirp_restrict = restrict;
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|
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if_init(); |
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ip_init(); |
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|
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/* Initialise mbufs *after* setting the MTU */
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m_init(); |
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|
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/* set default addresses */
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inet_aton("127.0.0.1", &loopback_addr);
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|
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if (get_dns_addr(&dns_addr) < 0) { |
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dns_addr = loopback_addr; |
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fprintf (stderr, "Warning: No DNS servers found\n");
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} |
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|
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if (special_ip)
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slirp_special_ip = special_ip; |
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|
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inet_aton(slirp_special_ip, &special_addr); |
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alias_addr.s_addr = special_addr.s_addr | htonl(CTL_ALIAS); |
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getouraddr(); |
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register_savevm("slirp", 0, 1, slirp_state_save, slirp_state_load, NULL); |
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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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/*
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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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|
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_ftime(&tb); |
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curtime = (u_int)tb.time * (u_int)1000;
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curtime += (u_int)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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gettimeofday(&tt, 0);
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|
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curtime = (u_int)tt.tv_sec * (u_int)1000;
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curtime += (u_int)tt.tv_usec / (u_int)1000;
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|
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if ((tt.tv_usec % 1000) >= 500) |
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curtime++; |
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} |
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#endif
|
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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) |
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{
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struct socket *so, *so_next;
|
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struct timeval timeout;
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int nfds;
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int tmp_time;
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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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|
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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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if (link_up) {
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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 = ((tcb.so_next != &tcb) || |
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((struct ipasfrag *)&ipq != (struct ipasfrag *)ipq.next)); |
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|
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for (so = tcb.so_next; so != &tcb; so = so_next) {
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so_next = so->so_next; |
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|
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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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/*
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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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/*
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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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} |
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|
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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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} |
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|
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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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if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) {
|
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FD_SET(so->s, writefds); |
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UPD_NFDS(so->s); |
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} |
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|
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/*
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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))) { |
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FD_SET(so->s, readfds); |
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FD_SET(so->s, xfds); |
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UPD_NFDS(so->s); |
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} |
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} |
| 320 |
|
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/*
|
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* UDP sockets
|
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*/
|
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for (so = udb.so_next; so != &udb; so = so_next) {
|
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so_next = so->so_next; |
| 326 |
|
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/*
|
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* See if it's timed out
|
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*/
|
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if (so->so_expire) {
|
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if (so->so_expire <= curtime) {
|
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udp_detach(so); |
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continue;
|
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} else
|
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do_slowtimo = 1; /* Let socket expire */ |
| 336 |
} |
| 337 |
|
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/*
|
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* When UDP packets are received from over the
|
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* link, they're sendto()'d straight away, so
|
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* no need for setting for writing
|
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* Limit the number of packets queued by this session
|
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* to 4. Note that even though we try and limit this
|
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* to 4 packets, the session could have more queued
|
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* if the packets needed to be fragmented
|
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* (XXX <= 4 ?)
|
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*/
|
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if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { |
| 349 |
FD_SET(so->s, readfds); |
| 350 |
UPD_NFDS(so->s); |
| 351 |
} |
| 352 |
} |
| 353 |
} |
| 354 |
|
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/*
|
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* Setup timeout to use minimum CPU usage, especially when idle
|
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*/
|
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|
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/*
|
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* First, see the timeout needed by *timo
|
| 361 |
*/
|
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timeout.tv_sec = 0;
|
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timeout.tv_usec = -1;
|
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/*
|
| 365 |
* If a slowtimo is needed, set timeout to 500ms from the last
|
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* slow timeout. If a fast timeout is needed, set timeout within
|
| 367 |
* 200ms of when it was requested.
|
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*/
|
| 369 |
if (do_slowtimo) {
|
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/* XXX + 10000 because some select()'s aren't that accurate */
|
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timeout.tv_usec = ((500 - (curtime - last_slowtimo)) * 1000) + 10000; |
| 372 |
if (timeout.tv_usec < 0) |
| 373 |
timeout.tv_usec = 0;
|
| 374 |
else if (timeout.tv_usec > 510000) |
| 375 |
timeout.tv_usec = 510000;
|
| 376 |
|
| 377 |
/* Can only fasttimo if we also slowtimo */
|
| 378 |
if (time_fasttimo) {
|
| 379 |
tmp_time = (200 - (curtime - time_fasttimo)) * 1000; |
| 380 |
if (tmp_time < 0) |
| 381 |
tmp_time = 0;
|
| 382 |
|
| 383 |
/* Choose the smallest of the 2 */
|
| 384 |
if (tmp_time < timeout.tv_usec)
|
| 385 |
timeout.tv_usec = (u_int)tmp_time; |
| 386 |
} |
| 387 |
} |
| 388 |
*pnfds = nfds; |
| 389 |
} |
| 390 |
|
| 391 |
void slirp_select_poll(fd_set *readfds, fd_set *writefds, fd_set *xfds)
|
| 392 |
{
|
| 393 |
struct socket *so, *so_next;
|
| 394 |
int ret;
|
| 395 |
|
| 396 |
global_readfds = readfds; |
| 397 |
global_writefds = writefds; |
| 398 |
global_xfds = xfds; |
| 399 |
|
| 400 |
/* Update time */
|
| 401 |
updtime(); |
| 402 |
|
| 403 |
/*
|
| 404 |
* See if anything has timed out
|
| 405 |
*/
|
| 406 |
if (link_up) {
|
| 407 |
if (time_fasttimo && ((curtime - time_fasttimo) >= 2)) { |
| 408 |
tcp_fasttimo(); |
| 409 |
time_fasttimo = 0;
|
| 410 |
} |
| 411 |
if (do_slowtimo && ((curtime - last_slowtimo) >= 499)) { |
| 412 |
ip_slowtimo(); |
| 413 |
tcp_slowtimo(); |
| 414 |
last_slowtimo = curtime; |
| 415 |
} |
| 416 |
} |
| 417 |
|
| 418 |
/*
|
| 419 |
* Check sockets
|
| 420 |
*/
|
| 421 |
if (link_up) {
|
| 422 |
/*
|
| 423 |
* Check TCP sockets
|
| 424 |
*/
|
| 425 |
for (so = tcb.so_next; so != &tcb; so = so_next) {
|
| 426 |
so_next = so->so_next; |
| 427 |
|
| 428 |
/*
|
| 429 |
* FD_ISSET is meaningless on these sockets
|
| 430 |
* (and they can crash the program)
|
| 431 |
*/
|
| 432 |
if (so->so_state & SS_NOFDREF || so->s == -1) |
| 433 |
continue;
|
| 434 |
|
| 435 |
/*
|
| 436 |
* Check for URG data
|
| 437 |
* This will soread as well, so no need to
|
| 438 |
* test for readfds below if this succeeds
|
| 439 |
*/
|
| 440 |
if (FD_ISSET(so->s, xfds))
|
| 441 |
sorecvoob(so); |
| 442 |
/*
|
| 443 |
* Check sockets for reading
|
| 444 |
*/
|
| 445 |
else if (FD_ISSET(so->s, readfds)) { |
| 446 |
/*
|
| 447 |
* Check for incoming connections
|
| 448 |
*/
|
| 449 |
if (so->so_state & SS_FACCEPTCONN) {
|
| 450 |
tcp_connect(so); |
| 451 |
continue;
|
| 452 |
} /* else */
|
| 453 |
ret = soread(so); |
| 454 |
|
| 455 |
/* Output it if we read something */
|
| 456 |
if (ret > 0) |
| 457 |
tcp_output(sototcpcb(so)); |
| 458 |
} |
| 459 |
|
| 460 |
/*
|
| 461 |
* Check sockets for writing
|
| 462 |
*/
|
| 463 |
if (FD_ISSET(so->s, writefds)) {
|
| 464 |
/*
|
| 465 |
* Check for non-blocking, still-connecting sockets
|
| 466 |
*/
|
| 467 |
if (so->so_state & SS_ISFCONNECTING) {
|
| 468 |
/* Connected */
|
| 469 |
so->so_state &= ~SS_ISFCONNECTING; |
| 470 |
|
| 471 |
ret = send(so->s, &ret, 0, 0); |
| 472 |
if (ret < 0) { |
| 473 |
/* XXXXX Must fix, zero bytes is a NOP */
|
| 474 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
| 475 |
errno == EINPROGRESS || errno == ENOTCONN) |
| 476 |
continue;
|
| 477 |
|
| 478 |
/* else failed */
|
| 479 |
so->so_state = SS_NOFDREF; |
| 480 |
} |
| 481 |
/* else so->so_state &= ~SS_ISFCONNECTING; */
|
| 482 |
|
| 483 |
/*
|
| 484 |
* Continue tcp_input
|
| 485 |
*/
|
| 486 |
tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); |
| 487 |
/* continue; */
|
| 488 |
} else
|
| 489 |
ret = sowrite(so); |
| 490 |
/*
|
| 491 |
* XXXXX If we wrote something (a lot), there
|
| 492 |
* could be a need for a window update.
|
| 493 |
* In the worst case, the remote will send
|
| 494 |
* a window probe to get things going again
|
| 495 |
*/
|
| 496 |
} |
| 497 |
|
| 498 |
/*
|
| 499 |
* Probe a still-connecting, non-blocking socket
|
| 500 |
* to check if it's still alive
|
| 501 |
*/
|
| 502 |
#ifdef PROBE_CONN
|
| 503 |
if (so->so_state & SS_ISFCONNECTING) {
|
| 504 |
ret = recv(so->s, (char *)&ret, 0,0); |
| 505 |
|
| 506 |
if (ret < 0) { |
| 507 |
/* XXX */
|
| 508 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
| 509 |
errno == EINPROGRESS || errno == ENOTCONN) |
| 510 |
continue; /* Still connecting, continue */ |
| 511 |
|
| 512 |
/* else failed */
|
| 513 |
so->so_state = SS_NOFDREF; |
| 514 |
|
| 515 |
/* tcp_input will take care of it */
|
| 516 |
} else {
|
| 517 |
ret = send(so->s, &ret, 0,0); |
| 518 |
if (ret < 0) { |
| 519 |
/* XXX */
|
| 520 |
if (errno == EAGAIN || errno == EWOULDBLOCK ||
|
| 521 |
errno == EINPROGRESS || errno == ENOTCONN) |
| 522 |
continue;
|
| 523 |
/* else failed */
|
| 524 |
so->so_state = SS_NOFDREF; |
| 525 |
} else
|
| 526 |
so->so_state &= ~SS_ISFCONNECTING; |
| 527 |
|
| 528 |
} |
| 529 |
tcp_input((struct mbuf *)NULL, sizeof(struct ip),so); |
| 530 |
} /* SS_ISFCONNECTING */
|
| 531 |
#endif
|
| 532 |
} |
| 533 |
|
| 534 |
/*
|
| 535 |
* Now UDP sockets.
|
| 536 |
* Incoming packets are sent straight away, they're not buffered.
|
| 537 |
* Incoming UDP data isn't buffered either.
|
| 538 |
*/
|
| 539 |
for (so = udb.so_next; so != &udb; so = so_next) {
|
| 540 |
so_next = so->so_next; |
| 541 |
|
| 542 |
if (so->s != -1 && FD_ISSET(so->s, readfds)) { |
| 543 |
sorecvfrom(so); |
| 544 |
} |
| 545 |
} |
| 546 |
} |
| 547 |
|
| 548 |
/*
|
| 549 |
* See if we can start outputting
|
| 550 |
*/
|
| 551 |
if (if_queued && link_up)
|
| 552 |
if_start(); |
| 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 |
unsigned char ar_sip[4]; /* sender IP address */ |
| 593 |
unsigned char ar_tha[ETH_ALEN]; /* target hardware address */ |
| 594 |
unsigned char ar_tip[4]; /* target IP address */ |
| 595 |
}; |
| 596 |
|
| 597 |
static void arp_input(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 (!memcmp(ah->ar_tip, &special_addr, 3)) { |
| 611 |
if (ah->ar_tip[3] == CTL_DNS || ah->ar_tip[3] == CTL_ALIAS) |
| 612 |
goto arp_ok;
|
| 613 |
for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {
|
| 614 |
if (ex_ptr->ex_addr == ah->ar_tip[3]) |
| 615 |
goto arp_ok;
|
| 616 |
} |
| 617 |
return;
|
| 618 |
arp_ok:
|
| 619 |
/* XXX: make an ARP request to have the client address */
|
| 620 |
memcpy(client_ethaddr, eh->h_source, ETH_ALEN); |
| 621 |
|
| 622 |
/* ARP request for alias/dns mac address */
|
| 623 |
memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); |
| 624 |
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
|
| 625 |
reh->h_source[5] = ah->ar_tip[3]; |
| 626 |
reh->h_proto = htons(ETH_P_ARP); |
| 627 |
|
| 628 |
rah->ar_hrd = htons(1);
|
| 629 |
rah->ar_pro = htons(ETH_P_IP); |
| 630 |
rah->ar_hln = ETH_ALEN; |
| 631 |
rah->ar_pln = 4;
|
| 632 |
rah->ar_op = htons(ARPOP_REPLY); |
| 633 |
memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); |
| 634 |
memcpy(rah->ar_sip, ah->ar_tip, 4);
|
| 635 |
memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); |
| 636 |
memcpy(rah->ar_tip, ah->ar_sip, 4);
|
| 637 |
slirp_output(arp_reply, sizeof(arp_reply));
|
| 638 |
} |
| 639 |
break;
|
| 640 |
case ARPOP_REPLY:
|
| 641 |
/* reply to request of client mac address ? */
|
| 642 |
if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN) &&
|
| 643 |
!memcmp(ah->ar_sip, &client_ipaddr.s_addr, 4)) {
|
| 644 |
memcpy(client_ethaddr, ah->ar_sha, ETH_ALEN); |
| 645 |
} |
| 646 |
break;
|
| 647 |
default:
|
| 648 |
break;
|
| 649 |
} |
| 650 |
} |
| 651 |
|
| 652 |
void slirp_input(const uint8_t *pkt, int pkt_len) |
| 653 |
{
|
| 654 |
struct mbuf *m;
|
| 655 |
int proto;
|
| 656 |
|
| 657 |
if (pkt_len < ETH_HLEN)
|
| 658 |
return;
|
| 659 |
|
| 660 |
proto = ntohs(*(uint16_t *)(pkt + 12));
|
| 661 |
switch(proto) {
|
| 662 |
case ETH_P_ARP:
|
| 663 |
arp_input(pkt, pkt_len); |
| 664 |
break;
|
| 665 |
case ETH_P_IP:
|
| 666 |
m = m_get(); |
| 667 |
if (!m)
|
| 668 |
return;
|
| 669 |
/* Note: we add to align the IP header */
|
| 670 |
if (M_FREEROOM(m) < pkt_len + 2) { |
| 671 |
m_inc(m, pkt_len + 2);
|
| 672 |
} |
| 673 |
m->m_len = pkt_len + 2;
|
| 674 |
memcpy(m->m_data + 2, pkt, pkt_len);
|
| 675 |
|
| 676 |
m->m_data += 2 + ETH_HLEN;
|
| 677 |
m->m_len -= 2 + ETH_HLEN;
|
| 678 |
|
| 679 |
ip_input(m); |
| 680 |
break;
|
| 681 |
default:
|
| 682 |
break;
|
| 683 |
} |
| 684 |
} |
| 685 |
|
| 686 |
/* output the IP packet to the ethernet device */
|
| 687 |
void if_encap(const uint8_t *ip_data, int ip_data_len) |
| 688 |
{
|
| 689 |
uint8_t buf[1600];
|
| 690 |
struct ethhdr *eh = (struct ethhdr *)buf; |
| 691 |
|
| 692 |
if (ip_data_len + ETH_HLEN > sizeof(buf)) |
| 693 |
return;
|
| 694 |
|
| 695 |
if (!memcmp(client_ethaddr, zero_ethaddr, ETH_ALEN)) {
|
| 696 |
uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; |
| 697 |
struct ethhdr *reh = (struct ethhdr *)arp_req; |
| 698 |
struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); |
| 699 |
const struct ip *iph = (const struct ip *)ip_data; |
| 700 |
|
| 701 |
/* If the client addr is not known, there is no point in
|
| 702 |
sending the packet to it. Normally the sender should have
|
| 703 |
done an ARP request to get its MAC address. Here we do it
|
| 704 |
in place of sending the packet and we hope that the sender
|
| 705 |
will retry sending its packet. */
|
| 706 |
memset(reh->h_dest, 0xff, ETH_ALEN);
|
| 707 |
memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 1);
|
| 708 |
reh->h_source[5] = CTL_ALIAS;
|
| 709 |
reh->h_proto = htons(ETH_P_ARP); |
| 710 |
rah->ar_hrd = htons(1);
|
| 711 |
rah->ar_pro = htons(ETH_P_IP); |
| 712 |
rah->ar_hln = ETH_ALEN; |
| 713 |
rah->ar_pln = 4;
|
| 714 |
rah->ar_op = htons(ARPOP_REQUEST); |
| 715 |
/* source hw addr */
|
| 716 |
memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 1);
|
| 717 |
rah->ar_sha[5] = CTL_ALIAS;
|
| 718 |
/* source IP */
|
| 719 |
memcpy(rah->ar_sip, &alias_addr, 4);
|
| 720 |
/* target hw addr (none) */
|
| 721 |
memset(rah->ar_tha, 0, ETH_ALEN);
|
| 722 |
/* target IP */
|
| 723 |
memcpy(rah->ar_tip, &iph->ip_dst, 4);
|
| 724 |
client_ipaddr = iph->ip_dst; |
| 725 |
slirp_output(arp_req, sizeof(arp_req));
|
| 726 |
} else {
|
| 727 |
memcpy(eh->h_dest, client_ethaddr, ETH_ALEN); |
| 728 |
memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 1);
|
| 729 |
/* XXX: not correct */
|
| 730 |
eh->h_source[5] = CTL_ALIAS;
|
| 731 |
eh->h_proto = htons(ETH_P_IP); |
| 732 |
memcpy(buf + sizeof(struct ethhdr), ip_data, ip_data_len); |
| 733 |
slirp_output(buf, ip_data_len + ETH_HLEN); |
| 734 |
} |
| 735 |
} |
| 736 |
|
| 737 |
int slirp_redir(int is_udp, int host_port, |
| 738 |
struct in_addr guest_addr, int guest_port) |
| 739 |
{
|
| 740 |
if (is_udp) {
|
| 741 |
if (!udp_listen(htons(host_port), guest_addr.s_addr,
|
| 742 |
htons(guest_port), 0))
|
| 743 |
return -1; |
| 744 |
} else {
|
| 745 |
if (!solisten(htons(host_port), guest_addr.s_addr,
|
| 746 |
htons(guest_port), 0))
|
| 747 |
return -1; |
| 748 |
} |
| 749 |
return 0; |
| 750 |
} |
| 751 |
|
| 752 |
int slirp_add_exec(int do_pty, const void *args, int addr_low_byte, |
| 753 |
int guest_port)
|
| 754 |
{
|
| 755 |
return add_exec(&exec_list, do_pty, (char *)args, |
| 756 |
addr_low_byte, htons(guest_port)); |
| 757 |
} |
| 758 |
|
| 759 |
ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) |
| 760 |
{
|
| 761 |
if (so->s == -1 && so->extra) { |
| 762 |
qemu_chr_write(so->extra, buf, len); |
| 763 |
return len;
|
| 764 |
} |
| 765 |
|
| 766 |
return send(so->s, buf, len, flags);
|
| 767 |
} |
| 768 |
|
| 769 |
static struct socket *slirp_find_ctl_socket(int addr_low_byte, int guest_port) |
| 770 |
{
|
| 771 |
struct socket *so;
|
| 772 |
|
| 773 |
for (so = tcb.so_next; so != &tcb; so = so->so_next) {
|
| 774 |
if ((so->so_faddr.s_addr & htonl(0xffffff00)) == |
| 775 |
special_addr.s_addr |
| 776 |
&& (ntohl(so->so_faddr.s_addr) & 0xff) ==
|
| 777 |
addr_low_byte |
| 778 |
&& htons(so->so_fport) == guest_port) |
| 779 |
return so;
|
| 780 |
} |
| 781 |
|
| 782 |
return NULL; |
| 783 |
} |
| 784 |
|
| 785 |
size_t slirp_socket_can_recv(int addr_low_byte, int guest_port) |
| 786 |
{
|
| 787 |
struct iovec iov[2]; |
| 788 |
struct socket *so;
|
| 789 |
|
| 790 |
if (!link_up)
|
| 791 |
return 0; |
| 792 |
|
| 793 |
so = slirp_find_ctl_socket(addr_low_byte, guest_port); |
| 794 |
|
| 795 |
if (!so || so->so_state & SS_NOFDREF)
|
| 796 |
return 0; |
| 797 |
|
| 798 |
if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) |
| 799 |
return 0; |
| 800 |
|
| 801 |
return sopreprbuf(so, iov, NULL); |
| 802 |
} |
| 803 |
|
| 804 |
void slirp_socket_recv(int addr_low_byte, int guest_port, const uint8_t *buf, |
| 805 |
int size)
|
| 806 |
{
|
| 807 |
int ret;
|
| 808 |
struct socket *so = slirp_find_ctl_socket(addr_low_byte, guest_port);
|
| 809 |
|
| 810 |
if (!so)
|
| 811 |
return;
|
| 812 |
|
| 813 |
ret = soreadbuf(so, (const char *)buf, size); |
| 814 |
|
| 815 |
if (ret > 0) |
| 816 |
tcp_output(sototcpcb(so)); |
| 817 |
} |
| 818 |
|
| 819 |
static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp) |
| 820 |
{
|
| 821 |
int i;
|
| 822 |
|
| 823 |
qemu_put_sbe16(f, tp->t_state); |
| 824 |
for (i = 0; i < TCPT_NTIMERS; i++) |
| 825 |
qemu_put_sbe16(f, tp->t_timer[i]); |
| 826 |
qemu_put_sbe16(f, tp->t_rxtshift); |
| 827 |
qemu_put_sbe16(f, tp->t_rxtcur); |
| 828 |
qemu_put_sbe16(f, tp->t_dupacks); |
| 829 |
qemu_put_be16(f, tp->t_maxseg); |
| 830 |
qemu_put_sbyte(f, tp->t_force); |
| 831 |
qemu_put_be16(f, tp->t_flags); |
| 832 |
qemu_put_be32(f, tp->snd_una); |
| 833 |
qemu_put_be32(f, tp->snd_nxt); |
| 834 |
qemu_put_be32(f, tp->snd_up); |
| 835 |
qemu_put_be32(f, tp->snd_wl1); |
| 836 |
qemu_put_be32(f, tp->snd_wl2); |
| 837 |
qemu_put_be32(f, tp->iss); |
| 838 |
qemu_put_be32(f, tp->snd_wnd); |
| 839 |
qemu_put_be32(f, tp->rcv_wnd); |
| 840 |
qemu_put_be32(f, tp->rcv_nxt); |
| 841 |
qemu_put_be32(f, tp->rcv_up); |
| 842 |
qemu_put_be32(f, tp->irs); |
| 843 |
qemu_put_be32(f, tp->rcv_adv); |
| 844 |
qemu_put_be32(f, tp->snd_max); |
| 845 |
qemu_put_be32(f, tp->snd_cwnd); |
| 846 |
qemu_put_be32(f, tp->snd_ssthresh); |
| 847 |
qemu_put_sbe16(f, tp->t_idle); |
| 848 |
qemu_put_sbe16(f, tp->t_rtt); |
| 849 |
qemu_put_be32(f, tp->t_rtseq); |
| 850 |
qemu_put_sbe16(f, tp->t_srtt); |
| 851 |
qemu_put_sbe16(f, tp->t_rttvar); |
| 852 |
qemu_put_be16(f, tp->t_rttmin); |
| 853 |
qemu_put_be32(f, tp->max_sndwnd); |
| 854 |
qemu_put_byte(f, tp->t_oobflags); |
| 855 |
qemu_put_byte(f, tp->t_iobc); |
| 856 |
qemu_put_sbe16(f, tp->t_softerror); |
| 857 |
qemu_put_byte(f, tp->snd_scale); |
| 858 |
qemu_put_byte(f, tp->rcv_scale); |
| 859 |
qemu_put_byte(f, tp->request_r_scale); |
| 860 |
qemu_put_byte(f, tp->requested_s_scale); |
| 861 |
qemu_put_be32(f, tp->ts_recent); |
| 862 |
qemu_put_be32(f, tp->ts_recent_age); |
| 863 |
qemu_put_be32(f, tp->last_ack_sent); |
| 864 |
} |
| 865 |
|
| 866 |
static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) |
| 867 |
{
|
| 868 |
uint32_t off; |
| 869 |
|
| 870 |
qemu_put_be32(f, sbuf->sb_cc); |
| 871 |
qemu_put_be32(f, sbuf->sb_datalen); |
| 872 |
off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); |
| 873 |
qemu_put_sbe32(f, off); |
| 874 |
off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); |
| 875 |
qemu_put_sbe32(f, off); |
| 876 |
qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
| 877 |
} |
| 878 |
|
| 879 |
static void slirp_socket_save(QEMUFile *f, struct socket *so) |
| 880 |
{
|
| 881 |
qemu_put_be32(f, so->so_urgc); |
| 882 |
qemu_put_be32(f, so->so_faddr.s_addr); |
| 883 |
qemu_put_be32(f, so->so_laddr.s_addr); |
| 884 |
qemu_put_be16(f, so->so_fport); |
| 885 |
qemu_put_be16(f, so->so_lport); |
| 886 |
qemu_put_byte(f, so->so_iptos); |
| 887 |
qemu_put_byte(f, so->so_emu); |
| 888 |
qemu_put_byte(f, so->so_type); |
| 889 |
qemu_put_be32(f, so->so_state); |
| 890 |
slirp_sbuf_save(f, &so->so_rcv); |
| 891 |
slirp_sbuf_save(f, &so->so_snd); |
| 892 |
slirp_tcp_save(f, so->so_tcpcb); |
| 893 |
} |
| 894 |
|
| 895 |
static void slirp_state_save(QEMUFile *f, void *opaque) |
| 896 |
{
|
| 897 |
struct ex_list *ex_ptr;
|
| 898 |
|
| 899 |
for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
|
| 900 |
if (ex_ptr->ex_pty == 3) { |
| 901 |
struct socket *so;
|
| 902 |
so = slirp_find_ctl_socket(ex_ptr->ex_addr, ntohs(ex_ptr->ex_fport)); |
| 903 |
if (!so)
|
| 904 |
continue;
|
| 905 |
|
| 906 |
qemu_put_byte(f, 42);
|
| 907 |
slirp_socket_save(f, so); |
| 908 |
} |
| 909 |
qemu_put_byte(f, 0);
|
| 910 |
} |
| 911 |
|
| 912 |
static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp) |
| 913 |
{
|
| 914 |
int i;
|
| 915 |
|
| 916 |
tp->t_state = qemu_get_sbe16(f); |
| 917 |
for (i = 0; i < TCPT_NTIMERS; i++) |
| 918 |
tp->t_timer[i] = qemu_get_sbe16(f); |
| 919 |
tp->t_rxtshift = qemu_get_sbe16(f); |
| 920 |
tp->t_rxtcur = qemu_get_sbe16(f); |
| 921 |
tp->t_dupacks = qemu_get_sbe16(f); |
| 922 |
tp->t_maxseg = qemu_get_be16(f); |
| 923 |
tp->t_force = qemu_get_sbyte(f); |
| 924 |
tp->t_flags = qemu_get_be16(f); |
| 925 |
tp->snd_una = qemu_get_be32(f); |
| 926 |
tp->snd_nxt = qemu_get_be32(f); |
| 927 |
tp->snd_up = qemu_get_be32(f); |
| 928 |
tp->snd_wl1 = qemu_get_be32(f); |
| 929 |
tp->snd_wl2 = qemu_get_be32(f); |
| 930 |
tp->iss = qemu_get_be32(f); |
| 931 |
tp->snd_wnd = qemu_get_be32(f); |
| 932 |
tp->rcv_wnd = qemu_get_be32(f); |
| 933 |
tp->rcv_nxt = qemu_get_be32(f); |
| 934 |
tp->rcv_up = qemu_get_be32(f); |
| 935 |
tp->irs = qemu_get_be32(f); |
| 936 |
tp->rcv_adv = qemu_get_be32(f); |
| 937 |
tp->snd_max = qemu_get_be32(f); |
| 938 |
tp->snd_cwnd = qemu_get_be32(f); |
| 939 |
tp->snd_ssthresh = qemu_get_be32(f); |
| 940 |
tp->t_idle = qemu_get_sbe16(f); |
| 941 |
tp->t_rtt = qemu_get_sbe16(f); |
| 942 |
tp->t_rtseq = qemu_get_be32(f); |
| 943 |
tp->t_srtt = qemu_get_sbe16(f); |
| 944 |
tp->t_rttvar = qemu_get_sbe16(f); |
| 945 |
tp->t_rttmin = qemu_get_be16(f); |
| 946 |
tp->max_sndwnd = qemu_get_be32(f); |
| 947 |
tp->t_oobflags = qemu_get_byte(f); |
| 948 |
tp->t_iobc = qemu_get_byte(f); |
| 949 |
tp->t_softerror = qemu_get_sbe16(f); |
| 950 |
tp->snd_scale = qemu_get_byte(f); |
| 951 |
tp->rcv_scale = qemu_get_byte(f); |
| 952 |
tp->request_r_scale = qemu_get_byte(f); |
| 953 |
tp->requested_s_scale = qemu_get_byte(f); |
| 954 |
tp->ts_recent = qemu_get_be32(f); |
| 955 |
tp->ts_recent_age = qemu_get_be32(f); |
| 956 |
tp->last_ack_sent = qemu_get_be32(f); |
| 957 |
tcp_template(tp); |
| 958 |
} |
| 959 |
|
| 960 |
static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf) |
| 961 |
{
|
| 962 |
uint32_t off, sb_cc, sb_datalen; |
| 963 |
|
| 964 |
sb_cc = qemu_get_be32(f); |
| 965 |
sb_datalen = qemu_get_be32(f); |
| 966 |
|
| 967 |
sbreserve(sbuf, sb_datalen); |
| 968 |
|
| 969 |
if (sbuf->sb_datalen != sb_datalen)
|
| 970 |
return -ENOMEM;
|
| 971 |
|
| 972 |
sbuf->sb_cc = sb_cc; |
| 973 |
|
| 974 |
off = qemu_get_sbe32(f); |
| 975 |
sbuf->sb_wptr = sbuf->sb_data + off; |
| 976 |
off = qemu_get_sbe32(f); |
| 977 |
sbuf->sb_rptr = sbuf->sb_data + off; |
| 978 |
qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); |
| 979 |
|
| 980 |
return 0; |
| 981 |
} |
| 982 |
|
| 983 |
static int slirp_socket_load(QEMUFile *f, struct socket *so) |
| 984 |
{
|
| 985 |
if (tcp_attach(so) < 0) |
| 986 |
return -ENOMEM;
|
| 987 |
|
| 988 |
so->so_urgc = qemu_get_be32(f); |
| 989 |
so->so_faddr.s_addr = qemu_get_be32(f); |
| 990 |
so->so_laddr.s_addr = qemu_get_be32(f); |
| 991 |
so->so_fport = qemu_get_be16(f); |
| 992 |
so->so_lport = qemu_get_be16(f); |
| 993 |
so->so_iptos = qemu_get_byte(f); |
| 994 |
so->so_emu = qemu_get_byte(f); |
| 995 |
so->so_type = qemu_get_byte(f); |
| 996 |
so->so_state = qemu_get_be32(f); |
| 997 |
if (slirp_sbuf_load(f, &so->so_rcv) < 0) |
| 998 |
return -ENOMEM;
|
| 999 |
if (slirp_sbuf_load(f, &so->so_snd) < 0) |
| 1000 |
return -ENOMEM;
|
| 1001 |
slirp_tcp_load(f, so->so_tcpcb); |
| 1002 |
|
| 1003 |
return 0; |
| 1004 |
} |
| 1005 |
|
| 1006 |
static int slirp_state_load(QEMUFile *f, void *opaque, int version_id) |
| 1007 |
{
|
| 1008 |
struct ex_list *ex_ptr;
|
| 1009 |
int r;
|
| 1010 |
|
| 1011 |
while ((r = qemu_get_byte(f))) {
|
| 1012 |
int ret;
|
| 1013 |
struct socket *so = socreate();
|
| 1014 |
|
| 1015 |
if (!so)
|
| 1016 |
return -ENOMEM;
|
| 1017 |
|
| 1018 |
ret = slirp_socket_load(f, so); |
| 1019 |
|
| 1020 |
if (ret < 0) |
| 1021 |
return ret;
|
| 1022 |
|
| 1023 |
if ((so->so_faddr.s_addr & htonl(0xffffff00)) != special_addr.s_addr) |
| 1024 |
return -EINVAL;
|
| 1025 |
|
| 1026 |
for (ex_ptr = exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next)
|
| 1027 |
if (ex_ptr->ex_pty == 3 && |
| 1028 |
(ntohl(so->so_faddr.s_addr) & 0xff) == ex_ptr->ex_addr &&
|
| 1029 |
so->so_fport == ex_ptr->ex_fport) |
| 1030 |
break;
|
| 1031 |
|
| 1032 |
if (!ex_ptr)
|
| 1033 |
return -EINVAL;
|
| 1034 |
|
| 1035 |
so->extra = (void *)ex_ptr->ex_exec;
|
| 1036 |
} |
| 1037 |
|
| 1038 |
return 0; |
| 1039 |
} |