| /* | |
| * libslirp glue | |
| * | |
| * Copyright (c) 2004-2008 Fabrice Bellard | |
| * | |
| * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| * of this software and associated documentation files (the "Software"), to deal | |
| * in the Software without restriction, including without limitation the rights | |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| * copies of the Software, and to permit persons to whom the Software is | |
| * furnished to do so, subject to the following conditions: | |
| * | |
| * The above copyright notice and this permission notice shall be included in | |
| * all copies or substantial portions of the Software. | |
| * | |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| * THE SOFTWARE. | |
| */ | |
| #include "qemu-common.h" | |
| #include "qemu/timer.h" | |
| #include "sysemu/char.h" | |
| #include "slirp.h" | |
| #include "hw/hw.h" | |
| /* host loopback address */ | |
| struct in_addr loopback_addr; | |
| /* host loopback network mask */ | |
| unsigned long loopback_mask; | |
| /* emulated hosts use the MAC addr 52:55:IP:IP:IP:IP */ | |
| static const uint8_t special_ethaddr[ETH_ALEN] = { | |
| 0x52, 0x55, 0x00, 0x00, 0x00, 0x00 | |
| }; | |
| u_int curtime; | |
| static QTAILQ_HEAD(slirp_instances, Slirp) slirp_instances = | |
| QTAILQ_HEAD_INITIALIZER(slirp_instances); | |
| static struct in_addr dns_addr; | |
| static u_int dns_addr_time; | |
| #define TIMEOUT_FAST 2 /* milliseconds */ | |
| #define TIMEOUT_SLOW 499 /* milliseconds */ | |
| /* for the aging of certain requests like DNS */ | |
| #define TIMEOUT_DEFAULT 1000 /* milliseconds */ | |
| #ifdef _WIN32 | |
| int get_dns_addr(struct in_addr *pdns_addr) | |
| { | |
| FIXED_INFO *FixedInfo=NULL; | |
| ULONG BufLen; | |
| DWORD ret; | |
| IP_ADDR_STRING *pIPAddr; | |
| struct in_addr tmp_addr; | |
| if (dns_addr.s_addr != 0 && (curtime - dns_addr_time) < TIMEOUT_DEFAULT) { | |
| *pdns_addr = dns_addr; | |
| return 0; | |
| } | |
| FixedInfo = (FIXED_INFO *)GlobalAlloc(GPTR, sizeof(FIXED_INFO)); | |
| BufLen = sizeof(FIXED_INFO); | |
| if (ERROR_BUFFER_OVERFLOW == GetNetworkParams(FixedInfo, &BufLen)) { | |
| if (FixedInfo) { | |
| GlobalFree(FixedInfo); | |
| FixedInfo = NULL; | |
| } | |
| FixedInfo = GlobalAlloc(GPTR, BufLen); | |
| } | |
| if ((ret = GetNetworkParams(FixedInfo, &BufLen)) != ERROR_SUCCESS) { | |
| printf("GetNetworkParams failed. ret = %08x\n", (u_int)ret ); | |
| if (FixedInfo) { | |
| GlobalFree(FixedInfo); | |
| FixedInfo = NULL; | |
| } | |
| return -1; | |
| } | |
| pIPAddr = &(FixedInfo->DnsServerList); | |
| inet_aton(pIPAddr->IpAddress.String, &tmp_addr); | |
| *pdns_addr = tmp_addr; | |
| dns_addr = tmp_addr; | |
| dns_addr_time = curtime; | |
| if (FixedInfo) { | |
| GlobalFree(FixedInfo); | |
| FixedInfo = NULL; | |
| } | |
| return 0; | |
| } | |
| static void winsock_cleanup(void) | |
| { | |
| WSACleanup(); | |
| } | |
| #else | |
| static struct stat dns_addr_stat; | |
| int get_dns_addr(struct in_addr *pdns_addr) | |
| { | |
| char buff[512]; | |
| char buff2[257]; | |
| FILE *f; | |
| int found = 0; | |
| struct in_addr tmp_addr; | |
| if (dns_addr.s_addr != 0) { | |
| struct stat old_stat; | |
| if ((curtime - dns_addr_time) < TIMEOUT_DEFAULT) { | |
| *pdns_addr = dns_addr; | |
| return 0; | |
| } | |
| old_stat = dns_addr_stat; | |
| if (stat("/etc/resolv.conf", &dns_addr_stat) != 0) | |
| return -1; | |
| if ((dns_addr_stat.st_dev == old_stat.st_dev) | |
| && (dns_addr_stat.st_ino == old_stat.st_ino) | |
| && (dns_addr_stat.st_size == old_stat.st_size) | |
| && (dns_addr_stat.st_mtime == old_stat.st_mtime)) { | |
| *pdns_addr = dns_addr; | |
| return 0; | |
| } | |
| } | |
| f = fopen("/etc/resolv.conf", "r"); | |
| if (!f) | |
| return -1; | |
| #ifdef DEBUG | |
| fprintf(stderr, "IP address of your DNS(s): "); | |
| #endif | |
| while (fgets(buff, 512, f) != NULL) { | |
| if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) { | |
| if (!inet_aton(buff2, &tmp_addr)) | |
| continue; | |
| /* If it's the first one, set it to dns_addr */ | |
| if (!found) { | |
| *pdns_addr = tmp_addr; | |
| dns_addr = tmp_addr; | |
| dns_addr_time = curtime; | |
| } | |
| #ifdef DEBUG | |
| else | |
| fprintf(stderr, ", "); | |
| #endif | |
| if (++found > 3) { | |
| #ifdef DEBUG | |
| fprintf(stderr, "(more)"); | |
| #endif | |
| break; | |
| } | |
| #ifdef DEBUG | |
| else | |
| fprintf(stderr, "%s", inet_ntoa(tmp_addr)); | |
| #endif | |
| } | |
| } | |
| fclose(f); | |
| if (!found) | |
| return -1; | |
| return 0; | |
| } | |
| #endif | |
| static void slirp_init_once(void) | |
| { | |
| static int initialized; | |
| #ifdef _WIN32 | |
| WSADATA Data; | |
| #endif | |
| if (initialized) { | |
| return; | |
| } | |
| initialized = 1; | |
| #ifdef _WIN32 | |
| WSAStartup(MAKEWORD(2,0), &Data); | |
| atexit(winsock_cleanup); | |
| #endif | |
| loopback_addr.s_addr = htonl(INADDR_LOOPBACK); | |
| loopback_mask = htonl(IN_CLASSA_NET); | |
| } | |
| static void slirp_state_save(QEMUFile *f, void *opaque); | |
| static int slirp_state_load(QEMUFile *f, void *opaque, int version_id); | |
| Slirp *slirp_init(int restricted, struct in_addr vnetwork, | |
| struct in_addr vnetmask, struct in_addr vhost, | |
| const char *vhostname, const char *tftp_path, | |
| const char *bootfile, struct in_addr vdhcp_start, | |
| struct in_addr vnameserver, const char **vdnssearch, | |
| void *opaque) | |
| { | |
| Slirp *slirp = g_malloc0(sizeof(Slirp)); | |
| slirp_init_once(); | |
| /* set debug flags (useful when compiled with DEBUG enabled)*/ | |
| /* bitmask values (1 = CALL, 2 = MISC, 3 = ERROR) */ | |
| if (getenv("SLIRP_DEBUG")) | |
| slirp_debug = atoi(getenv("SLIRP_DEBUG")); | |
| slirp->restricted = restricted; | |
| if_init(slirp); | |
| ip_init(slirp); | |
| /* Initialise mbufs *after* setting the MTU */ | |
| m_init(slirp); | |
| slirp->vnetwork_addr = vnetwork; | |
| slirp->vnetwork_mask = vnetmask; | |
| slirp->vhost_addr = vhost; | |
| if (vhostname) { | |
| pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname), | |
| vhostname); | |
| } | |
| slirp->tftp_prefix = g_strdup(tftp_path); | |
| slirp->bootp_filename = g_strdup(bootfile); | |
| slirp->vdhcp_startaddr = vdhcp_start; | |
| slirp->vnameserver_addr = vnameserver; | |
| if (vdnssearch) { | |
| translate_dnssearch(slirp, vdnssearch); | |
| } | |
| slirp->opaque = opaque; | |
| register_savevm(NULL, "slirp", 0, 3, | |
| slirp_state_save, slirp_state_load, slirp); | |
| QTAILQ_INSERT_TAIL(&slirp_instances, slirp, entry); | |
| return slirp; | |
| } | |
| void slirp_cleanup(Slirp *slirp) | |
| { | |
| QTAILQ_REMOVE(&slirp_instances, slirp, entry); | |
| unregister_savevm(NULL, "slirp", slirp); | |
| ip_cleanup(slirp); | |
| m_cleanup(slirp); | |
| g_free(slirp->vdnssearch); | |
| g_free(slirp->tftp_prefix); | |
| g_free(slirp->bootp_filename); | |
| g_free(slirp); | |
| } | |
| #define CONN_CANFSEND(so) (((so)->so_state & (SS_FCANTSENDMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) | |
| #define CONN_CANFRCV(so) (((so)->so_state & (SS_FCANTRCVMORE|SS_ISFCONNECTED)) == SS_ISFCONNECTED) | |
| static void slirp_update_timeout(uint32_t *timeout) | |
| { | |
| Slirp *slirp; | |
| uint32_t t; | |
| if (*timeout <= TIMEOUT_FAST) { | |
| return; | |
| } | |
| t = MIN(1000, *timeout); | |
| /* If we have tcp timeout with slirp, then we will fill @timeout with | |
| * more precise value. | |
| */ | |
| QTAILQ_FOREACH(slirp, &slirp_instances, entry) { | |
| if (slirp->time_fasttimo) { | |
| *timeout = TIMEOUT_FAST; | |
| return; | |
| } | |
| if (slirp->do_slowtimo) { | |
| t = MIN(TIMEOUT_SLOW, t); | |
| } | |
| } | |
| *timeout = t; | |
| } | |
| void slirp_pollfds_fill(GArray *pollfds, uint32_t *timeout) | |
| { | |
| Slirp *slirp; | |
| struct socket *so, *so_next; | |
| if (QTAILQ_EMPTY(&slirp_instances)) { | |
| return; | |
| } | |
| /* | |
| * First, TCP sockets | |
| */ | |
| QTAILQ_FOREACH(slirp, &slirp_instances, entry) { | |
| /* | |
| * *_slowtimo needs calling if there are IP fragments | |
| * in the fragment queue, or there are TCP connections active | |
| */ | |
| slirp->do_slowtimo = ((slirp->tcb.so_next != &slirp->tcb) || | |
| (&slirp->ipq.ip_link != slirp->ipq.ip_link.next)); | |
| for (so = slirp->tcb.so_next; so != &slirp->tcb; | |
| so = so_next) { | |
| int events = 0; | |
| so_next = so->so_next; | |
| so->pollfds_idx = -1; | |
| /* | |
| * See if we need a tcp_fasttimo | |
| */ | |
| if (slirp->time_fasttimo == 0 && | |
| so->so_tcpcb->t_flags & TF_DELACK) { | |
| slirp->time_fasttimo = curtime; /* Flag when want a fasttimo */ | |
| } | |
| /* | |
| * NOFDREF can include still connecting to local-host, | |
| * newly socreated() sockets etc. Don't want to select these. | |
| */ | |
| if (so->so_state & SS_NOFDREF || so->s == -1) { | |
| continue; | |
| } | |
| /* | |
| * Set for reading sockets which are accepting | |
| */ | |
| if (so->so_state & SS_FACCEPTCONN) { | |
| GPollFD pfd = { so->s, G_IO_IN | G_IO_HUP | G_IO_ERR, 0 }; | |
| so->pollfds_idx = pollfds->len; | |
| g_array_append_val(pollfds, pfd); | |
| continue; | |
| } | |
| /* | |
| * Set for writing sockets which are connecting | |
| */ | |
| if (so->so_state & SS_ISFCONNECTING) { | |
| GPollFD pfd = { so->s, G_IO_OUT | G_IO_ERR, 0 }; | |
| so->pollfds_idx = pollfds->len; | |
| g_array_append_val(pollfds, pfd); | |
| continue; | |
| } | |
| /* | |
| * Set for writing if we are connected, can send more, and | |
| * we have something to send | |
| */ | |
| if (CONN_CANFSEND(so) && so->so_rcv.sb_cc) { | |
| events |= G_IO_OUT | G_IO_ERR; | |
| } | |
| /* | |
| * Set for reading (and urgent data) if we are connected, can | |
| * receive more, and we have room for it XXX /2 ? | |
| */ | |
| if (CONN_CANFRCV(so) && | |
| (so->so_snd.sb_cc < (so->so_snd.sb_datalen/2))) { | |
| events |= G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_PRI; | |
| } | |
| if (events) { | |
| GPollFD pfd = { so->s, events, 0 }; | |
| so->pollfds_idx = pollfds->len; | |
| g_array_append_val(pollfds, pfd); | |
| } | |
| } | |
| /* | |
| * UDP sockets | |
| */ | |
| for (so = slirp->udb.so_next; so != &slirp->udb; | |
| so = so_next) { | |
| so_next = so->so_next; | |
| so->pollfds_idx = -1; | |
| /* | |
| * See if it's timed out | |
| */ | |
| if (so->so_expire) { | |
| if (so->so_expire <= curtime) { | |
| udp_detach(so); | |
| continue; | |
| } else { | |
| slirp->do_slowtimo = true; /* Let socket expire */ | |
| } | |
| } | |
| /* | |
| * When UDP packets are received from over the | |
| * link, they're sendto()'d straight away, so | |
| * no need for setting for writing | |
| * Limit the number of packets queued by this session | |
| * to 4. Note that even though we try and limit this | |
| * to 4 packets, the session could have more queued | |
| * if the packets needed to be fragmented | |
| * (XXX <= 4 ?) | |
| */ | |
| if ((so->so_state & SS_ISFCONNECTED) && so->so_queued <= 4) { | |
| GPollFD pfd = { so->s, G_IO_IN | G_IO_HUP | G_IO_ERR, 0 }; | |
| so->pollfds_idx = pollfds->len; | |
| g_array_append_val(pollfds, pfd); | |
| } | |
| } | |
| /* | |
| * ICMP sockets | |
| */ | |
| for (so = slirp->icmp.so_next; so != &slirp->icmp; | |
| so = so_next) { | |
| so_next = so->so_next; | |
| so->pollfds_idx = -1; | |
| /* | |
| * See if it's timed out | |
| */ | |
| if (so->so_expire) { | |
| if (so->so_expire <= curtime) { | |
| icmp_detach(so); | |
| continue; | |
| } else { | |
| slirp->do_slowtimo = true; /* Let socket expire */ | |
| } | |
| } | |
| if (so->so_state & SS_ISFCONNECTED) { | |
| GPollFD pfd = { so->s, G_IO_IN | G_IO_HUP | G_IO_ERR, 0 }; | |
| so->pollfds_idx = pollfds->len; | |
| g_array_append_val(pollfds, pfd); | |
| } | |
| } | |
| } | |
| slirp_update_timeout(timeout); | |
| } | |
| void slirp_pollfds_poll(GArray *pollfds, int select_error) | |
| { | |
| Slirp *slirp; | |
| struct socket *so, *so_next; | |
| int ret; | |
| if (QTAILQ_EMPTY(&slirp_instances)) { | |
| return; | |
| } | |
| curtime = (u_int)qemu_clock_get_ms(QEMU_CLOCK_REALTIME); | |
| QTAILQ_FOREACH(slirp, &slirp_instances, entry) { | |
| /* | |
| * See if anything has timed out | |
| */ | |
| if (slirp->time_fasttimo && | |
| ((curtime - slirp->time_fasttimo) >= TIMEOUT_FAST)) { | |
| tcp_fasttimo(slirp); | |
| slirp->time_fasttimo = 0; | |
| } | |
| if (slirp->do_slowtimo && | |
| ((curtime - slirp->last_slowtimo) >= TIMEOUT_SLOW)) { | |
| ip_slowtimo(slirp); | |
| tcp_slowtimo(slirp); | |
| slirp->last_slowtimo = curtime; | |
| } | |
| /* | |
| * Check sockets | |
| */ | |
| if (!select_error) { | |
| /* | |
| * Check TCP sockets | |
| */ | |
| for (so = slirp->tcb.so_next; so != &slirp->tcb; | |
| so = so_next) { | |
| int revents; | |
| so_next = so->so_next; | |
| revents = 0; | |
| if (so->pollfds_idx != -1) { | |
| revents = g_array_index(pollfds, GPollFD, | |
| so->pollfds_idx).revents; | |
| } | |
| if (so->so_state & SS_NOFDREF || so->s == -1) { | |
| continue; | |
| } | |
| /* | |
| * Check for URG data | |
| * This will soread as well, so no need to | |
| * test for G_IO_IN below if this succeeds | |
| */ | |
| if (revents & G_IO_PRI) { | |
| sorecvoob(so); | |
| } | |
| /* | |
| * Check sockets for reading | |
| */ | |
| else if (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR)) { | |
| /* | |
| * Check for incoming connections | |
| */ | |
| if (so->so_state & SS_FACCEPTCONN) { | |
| tcp_connect(so); | |
| continue; | |
| } /* else */ | |
| ret = soread(so); | |
| /* Output it if we read something */ | |
| if (ret > 0) { | |
| tcp_output(sototcpcb(so)); | |
| } | |
| } | |
| /* | |
| * Check sockets for writing | |
| */ | |
| if (!(so->so_state & SS_NOFDREF) && | |
| (revents & (G_IO_OUT | G_IO_ERR))) { | |
| /* | |
| * Check for non-blocking, still-connecting sockets | |
| */ | |
| if (so->so_state & SS_ISFCONNECTING) { | |
| /* Connected */ | |
| so->so_state &= ~SS_ISFCONNECTING; | |
| ret = send(so->s, (const void *) &ret, 0, 0); | |
| if (ret < 0) { | |
| /* XXXXX Must fix, zero bytes is a NOP */ | |
| if (errno == EAGAIN || errno == EWOULDBLOCK || | |
| errno == EINPROGRESS || errno == ENOTCONN) { | |
| continue; | |
| } | |
| /* else failed */ | |
| so->so_state &= SS_PERSISTENT_MASK; | |
| so->so_state |= SS_NOFDREF; | |
| } | |
| /* else so->so_state &= ~SS_ISFCONNECTING; */ | |
| /* | |
| * Continue tcp_input | |
| */ | |
| tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); | |
| /* continue; */ | |
| } else { | |
| ret = sowrite(so); | |
| } | |
| /* | |
| * XXXXX If we wrote something (a lot), there | |
| * could be a need for a window update. | |
| * In the worst case, the remote will send | |
| * a window probe to get things going again | |
| */ | |
| } | |
| /* | |
| * Probe a still-connecting, non-blocking socket | |
| * to check if it's still alive | |
| */ | |
| #ifdef PROBE_CONN | |
| if (so->so_state & SS_ISFCONNECTING) { | |
| ret = qemu_recv(so->s, &ret, 0, 0); | |
| if (ret < 0) { | |
| /* XXX */ | |
| if (errno == EAGAIN || errno == EWOULDBLOCK || | |
| errno == EINPROGRESS || errno == ENOTCONN) { | |
| continue; /* Still connecting, continue */ | |
| } | |
| /* else failed */ | |
| so->so_state &= SS_PERSISTENT_MASK; | |
| so->so_state |= SS_NOFDREF; | |
| /* tcp_input will take care of it */ | |
| } else { | |
| ret = send(so->s, &ret, 0, 0); | |
| if (ret < 0) { | |
| /* XXX */ | |
| if (errno == EAGAIN || errno == EWOULDBLOCK || | |
| errno == EINPROGRESS || errno == ENOTCONN) { | |
| continue; | |
| } | |
| /* else failed */ | |
| so->so_state &= SS_PERSISTENT_MASK; | |
| so->so_state |= SS_NOFDREF; | |
| } else { | |
| so->so_state &= ~SS_ISFCONNECTING; | |
| } | |
| } | |
| tcp_input((struct mbuf *)NULL, sizeof(struct ip), so); | |
| } /* SS_ISFCONNECTING */ | |
| #endif | |
| } | |
| /* | |
| * Now UDP sockets. | |
| * Incoming packets are sent straight away, they're not buffered. | |
| * Incoming UDP data isn't buffered either. | |
| */ | |
| for (so = slirp->udb.so_next; so != &slirp->udb; | |
| so = so_next) { | |
| int revents; | |
| so_next = so->so_next; | |
| revents = 0; | |
| if (so->pollfds_idx != -1) { | |
| revents = g_array_index(pollfds, GPollFD, | |
| so->pollfds_idx).revents; | |
| } | |
| if (so->s != -1 && | |
| (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) { | |
| sorecvfrom(so); | |
| } | |
| } | |
| /* | |
| * Check incoming ICMP relies. | |
| */ | |
| for (so = slirp->icmp.so_next; so != &slirp->icmp; | |
| so = so_next) { | |
| int revents; | |
| so_next = so->so_next; | |
| revents = 0; | |
| if (so->pollfds_idx != -1) { | |
| revents = g_array_index(pollfds, GPollFD, | |
| so->pollfds_idx).revents; | |
| } | |
| if (so->s != -1 && | |
| (revents & (G_IO_IN | G_IO_HUP | G_IO_ERR))) { | |
| icmp_receive(so); | |
| } | |
| } | |
| } | |
| if_start(slirp); | |
| } | |
| } | |
| static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) | |
| { | |
| struct arphdr *ah = (struct arphdr *)(pkt + ETH_HLEN); | |
| uint8_t arp_reply[max(ETH_HLEN + sizeof(struct arphdr), 64)]; | |
| struct ethhdr *reh = (struct ethhdr *)arp_reply; | |
| struct arphdr *rah = (struct arphdr *)(arp_reply + ETH_HLEN); | |
| int ar_op; | |
| struct ex_list *ex_ptr; | |
| ar_op = ntohs(ah->ar_op); | |
| switch(ar_op) { | |
| case ARPOP_REQUEST: | |
| if (ah->ar_tip == ah->ar_sip) { | |
| /* Gratuitous ARP */ | |
| arp_table_add(slirp, ah->ar_sip, ah->ar_sha); | |
| return; | |
| } | |
| if ((ah->ar_tip & slirp->vnetwork_mask.s_addr) == | |
| slirp->vnetwork_addr.s_addr) { | |
| if (ah->ar_tip == slirp->vnameserver_addr.s_addr || | |
| ah->ar_tip == slirp->vhost_addr.s_addr) | |
| goto arp_ok; | |
| for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { | |
| if (ex_ptr->ex_addr.s_addr == ah->ar_tip) | |
| goto arp_ok; | |
| } | |
| return; | |
| arp_ok: | |
| memset(arp_reply, 0, sizeof(arp_reply)); | |
| arp_table_add(slirp, ah->ar_sip, ah->ar_sha); | |
| /* ARP request for alias/dns mac address */ | |
| memcpy(reh->h_dest, pkt + ETH_ALEN, ETH_ALEN); | |
| memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4); | |
| memcpy(&reh->h_source[2], &ah->ar_tip, 4); | |
| reh->h_proto = htons(ETH_P_ARP); | |
| rah->ar_hrd = htons(1); | |
| rah->ar_pro = htons(ETH_P_IP); | |
| rah->ar_hln = ETH_ALEN; | |
| rah->ar_pln = 4; | |
| rah->ar_op = htons(ARPOP_REPLY); | |
| memcpy(rah->ar_sha, reh->h_source, ETH_ALEN); | |
| rah->ar_sip = ah->ar_tip; | |
| memcpy(rah->ar_tha, ah->ar_sha, ETH_ALEN); | |
| rah->ar_tip = ah->ar_sip; | |
| slirp_output(slirp->opaque, arp_reply, sizeof(arp_reply)); | |
| } | |
| break; | |
| case ARPOP_REPLY: | |
| arp_table_add(slirp, ah->ar_sip, ah->ar_sha); | |
| break; | |
| default: | |
| break; | |
| } | |
| } | |
| void slirp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len) | |
| { | |
| struct mbuf *m; | |
| int proto; | |
| if (pkt_len < ETH_HLEN) | |
| return; | |
| proto = ntohs(*(uint16_t *)(pkt + 12)); | |
| switch(proto) { | |
| case ETH_P_ARP: | |
| arp_input(slirp, pkt, pkt_len); | |
| break; | |
| case ETH_P_IP: | |
| m = m_get(slirp); | |
| if (!m) | |
| return; | |
| /* Note: we add to align the IP header */ | |
| if (M_FREEROOM(m) < pkt_len + 2) { | |
| m_inc(m, pkt_len + 2); | |
| } | |
| m->m_len = pkt_len + 2; | |
| memcpy(m->m_data + 2, pkt, pkt_len); | |
| m->m_data += 2 + ETH_HLEN; | |
| m->m_len -= 2 + ETH_HLEN; | |
| ip_input(m); | |
| break; | |
| default: | |
| break; | |
| } | |
| } | |
| /* Output the IP packet to the ethernet device. Returns 0 if the packet must be | |
| * re-queued. | |
| */ | |
| int if_encap(Slirp *slirp, struct mbuf *ifm) | |
| { | |
| uint8_t buf[1600]; | |
| struct ethhdr *eh = (struct ethhdr *)buf; | |
| uint8_t ethaddr[ETH_ALEN]; | |
| const struct ip *iph = (const struct ip *)ifm->m_data; | |
| if (ifm->m_len + ETH_HLEN > sizeof(buf)) { | |
| return 1; | |
| } | |
| if (iph->ip_dst.s_addr == 0) { | |
| /* 0.0.0.0 can not be a destination address, something went wrong, | |
| * avoid making it worse */ | |
| return 1; | |
| } | |
| if (!arp_table_search(slirp, iph->ip_dst.s_addr, ethaddr)) { | |
| uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)]; | |
| struct ethhdr *reh = (struct ethhdr *)arp_req; | |
| struct arphdr *rah = (struct arphdr *)(arp_req + ETH_HLEN); | |
| if (!ifm->arp_requested) { | |
| /* If the client addr is not known, send an ARP request */ | |
| memset(reh->h_dest, 0xff, ETH_ALEN); | |
| memcpy(reh->h_source, special_ethaddr, ETH_ALEN - 4); | |
| memcpy(&reh->h_source[2], &slirp->vhost_addr, 4); | |
| reh->h_proto = htons(ETH_P_ARP); | |
| rah->ar_hrd = htons(1); | |
| rah->ar_pro = htons(ETH_P_IP); | |
| rah->ar_hln = ETH_ALEN; | |
| rah->ar_pln = 4; | |
| rah->ar_op = htons(ARPOP_REQUEST); | |
| /* source hw addr */ | |
| memcpy(rah->ar_sha, special_ethaddr, ETH_ALEN - 4); | |
| memcpy(&rah->ar_sha[2], &slirp->vhost_addr, 4); | |
| /* source IP */ | |
| rah->ar_sip = slirp->vhost_addr.s_addr; | |
| /* target hw addr (none) */ | |
| memset(rah->ar_tha, 0, ETH_ALEN); | |
| /* target IP */ | |
| rah->ar_tip = iph->ip_dst.s_addr; | |
| slirp->client_ipaddr = iph->ip_dst; | |
| slirp_output(slirp->opaque, arp_req, sizeof(arp_req)); | |
| ifm->arp_requested = true; | |
| /* Expire request and drop outgoing packet after 1 second */ | |
| ifm->expiration_date = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + 1000000000ULL; | |
| } | |
| return 0; | |
| } else { | |
| memcpy(eh->h_dest, ethaddr, ETH_ALEN); | |
| memcpy(eh->h_source, special_ethaddr, ETH_ALEN - 4); | |
| /* XXX: not correct */ | |
| memcpy(&eh->h_source[2], &slirp->vhost_addr, 4); | |
| eh->h_proto = htons(ETH_P_IP); | |
| memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len); | |
| slirp_output(slirp->opaque, buf, ifm->m_len + ETH_HLEN); | |
| return 1; | |
| } | |
| } | |
| /* Drop host forwarding rule, return 0 if found. */ | |
| int slirp_remove_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, | |
| int host_port) | |
| { | |
| struct socket *so; | |
| struct socket *head = (is_udp ? &slirp->udb : &slirp->tcb); | |
| struct sockaddr_in addr; | |
| int port = htons(host_port); | |
| socklen_t addr_len; | |
| for (so = head->so_next; so != head; so = so->so_next) { | |
| addr_len = sizeof(addr); | |
| if ((so->so_state & SS_HOSTFWD) && | |
| getsockname(so->s, (struct sockaddr *)&addr, &addr_len) == 0 && | |
| addr.sin_addr.s_addr == host_addr.s_addr && | |
| addr.sin_port == port) { | |
| closesocket(so->s); | |
| sofree(so); | |
| return 0; | |
| } | |
| } | |
| return -1; | |
| } | |
| int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, | |
| int host_port, struct in_addr guest_addr, int guest_port) | |
| { | |
| if (!guest_addr.s_addr) { | |
| guest_addr = slirp->vdhcp_startaddr; | |
| } | |
| if (is_udp) { | |
| if (!udp_listen(slirp, host_addr.s_addr, htons(host_port), | |
| guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) | |
| return -1; | |
| } else { | |
| if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port), | |
| guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) | |
| return -1; | |
| } | |
| return 0; | |
| } | |
| int slirp_add_exec(Slirp *slirp, int do_pty, const void *args, | |
| struct in_addr *guest_addr, int guest_port) | |
| { | |
| if (!guest_addr->s_addr) { | |
| guest_addr->s_addr = slirp->vnetwork_addr.s_addr | | |
| (htonl(0x0204) & ~slirp->vnetwork_mask.s_addr); | |
| } | |
| if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) != | |
| slirp->vnetwork_addr.s_addr || | |
| guest_addr->s_addr == slirp->vhost_addr.s_addr || | |
| guest_addr->s_addr == slirp->vnameserver_addr.s_addr) { | |
| return -1; | |
| } | |
| return add_exec(&slirp->exec_list, do_pty, (char *)args, *guest_addr, | |
| htons(guest_port)); | |
| } | |
| ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) | |
| { | |
| if (so->s == -1 && so->extra) { | |
| qemu_chr_fe_write(so->extra, buf, len); | |
| return len; | |
| } | |
| return send(so->s, buf, len, flags); | |
| } | |
| static struct socket * | |
| slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port) | |
| { | |
| struct socket *so; | |
| for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) { | |
| if (so->so_faddr.s_addr == guest_addr.s_addr && | |
| htons(so->so_fport) == guest_port) { | |
| return so; | |
| } | |
| } | |
| return NULL; | |
| } | |
| size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr, | |
| int guest_port) | |
| { | |
| struct iovec iov[2]; | |
| struct socket *so; | |
| so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); | |
| if (!so || so->so_state & SS_NOFDREF) { | |
| return 0; | |
| } | |
| if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) { | |
| return 0; | |
| } | |
| return sopreprbuf(so, iov, NULL); | |
| } | |
| void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port, | |
| const uint8_t *buf, int size) | |
| { | |
| int ret; | |
| struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); | |
| if (!so) | |
| return; | |
| ret = soreadbuf(so, (const char *)buf, size); | |
| if (ret > 0) | |
| tcp_output(sototcpcb(so)); | |
| } | |
| static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp) | |
| { | |
| int i; | |
| qemu_put_sbe16(f, tp->t_state); | |
| for (i = 0; i < TCPT_NTIMERS; i++) | |
| qemu_put_sbe16(f, tp->t_timer[i]); | |
| qemu_put_sbe16(f, tp->t_rxtshift); | |
| qemu_put_sbe16(f, tp->t_rxtcur); | |
| qemu_put_sbe16(f, tp->t_dupacks); | |
| qemu_put_be16(f, tp->t_maxseg); | |
| qemu_put_sbyte(f, tp->t_force); | |
| qemu_put_be16(f, tp->t_flags); | |
| qemu_put_be32(f, tp->snd_una); | |
| qemu_put_be32(f, tp->snd_nxt); | |
| qemu_put_be32(f, tp->snd_up); | |
| qemu_put_be32(f, tp->snd_wl1); | |
| qemu_put_be32(f, tp->snd_wl2); | |
| qemu_put_be32(f, tp->iss); | |
| qemu_put_be32(f, tp->snd_wnd); | |
| qemu_put_be32(f, tp->rcv_wnd); | |
| qemu_put_be32(f, tp->rcv_nxt); | |
| qemu_put_be32(f, tp->rcv_up); | |
| qemu_put_be32(f, tp->irs); | |
| qemu_put_be32(f, tp->rcv_adv); | |
| qemu_put_be32(f, tp->snd_max); | |
| qemu_put_be32(f, tp->snd_cwnd); | |
| qemu_put_be32(f, tp->snd_ssthresh); | |
| qemu_put_sbe16(f, tp->t_idle); | |
| qemu_put_sbe16(f, tp->t_rtt); | |
| qemu_put_be32(f, tp->t_rtseq); | |
| qemu_put_sbe16(f, tp->t_srtt); | |
| qemu_put_sbe16(f, tp->t_rttvar); | |
| qemu_put_be16(f, tp->t_rttmin); | |
| qemu_put_be32(f, tp->max_sndwnd); | |
| qemu_put_byte(f, tp->t_oobflags); | |
| qemu_put_byte(f, tp->t_iobc); | |
| qemu_put_sbe16(f, tp->t_softerror); | |
| qemu_put_byte(f, tp->snd_scale); | |
| qemu_put_byte(f, tp->rcv_scale); | |
| qemu_put_byte(f, tp->request_r_scale); | |
| qemu_put_byte(f, tp->requested_s_scale); | |
| qemu_put_be32(f, tp->ts_recent); | |
| qemu_put_be32(f, tp->ts_recent_age); | |
| qemu_put_be32(f, tp->last_ack_sent); | |
| } | |
| static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) | |
| { | |
| uint32_t off; | |
| qemu_put_be32(f, sbuf->sb_cc); | |
| qemu_put_be32(f, sbuf->sb_datalen); | |
| off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); | |
| qemu_put_sbe32(f, off); | |
| off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); | |
| qemu_put_sbe32(f, off); | |
| qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); | |
| } | |
| static void slirp_socket_save(QEMUFile *f, struct socket *so) | |
| { | |
| qemu_put_be32(f, so->so_urgc); | |
| qemu_put_be32(f, so->so_faddr.s_addr); | |
| qemu_put_be32(f, so->so_laddr.s_addr); | |
| qemu_put_be16(f, so->so_fport); | |
| qemu_put_be16(f, so->so_lport); | |
| qemu_put_byte(f, so->so_iptos); | |
| qemu_put_byte(f, so->so_emu); | |
| qemu_put_byte(f, so->so_type); | |
| qemu_put_be32(f, so->so_state); | |
| slirp_sbuf_save(f, &so->so_rcv); | |
| slirp_sbuf_save(f, &so->so_snd); | |
| slirp_tcp_save(f, so->so_tcpcb); | |
| } | |
| static void slirp_bootp_save(QEMUFile *f, Slirp *slirp) | |
| { | |
| int i; | |
| for (i = 0; i < NB_BOOTP_CLIENTS; i++) { | |
| qemu_put_be16(f, slirp->bootp_clients[i].allocated); | |
| qemu_put_buffer(f, slirp->bootp_clients[i].macaddr, 6); | |
| } | |
| } | |
| static void slirp_state_save(QEMUFile *f, void *opaque) | |
| { | |
| Slirp *slirp = opaque; | |
| struct ex_list *ex_ptr; | |
| for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) | |
| if (ex_ptr->ex_pty == 3) { | |
| struct socket *so; | |
| so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr, | |
| ntohs(ex_ptr->ex_fport)); | |
| if (!so) | |
| continue; | |
| qemu_put_byte(f, 42); | |
| slirp_socket_save(f, so); | |
| } | |
| qemu_put_byte(f, 0); | |
| qemu_put_be16(f, slirp->ip_id); | |
| slirp_bootp_save(f, slirp); | |
| } | |
| static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp) | |
| { | |
| int i; | |
| tp->t_state = qemu_get_sbe16(f); | |
| for (i = 0; i < TCPT_NTIMERS; i++) | |
| tp->t_timer[i] = qemu_get_sbe16(f); | |
| tp->t_rxtshift = qemu_get_sbe16(f); | |
| tp->t_rxtcur = qemu_get_sbe16(f); | |
| tp->t_dupacks = qemu_get_sbe16(f); | |
| tp->t_maxseg = qemu_get_be16(f); | |
| tp->t_force = qemu_get_sbyte(f); | |
| tp->t_flags = qemu_get_be16(f); | |
| tp->snd_una = qemu_get_be32(f); | |
| tp->snd_nxt = qemu_get_be32(f); | |
| tp->snd_up = qemu_get_be32(f); | |
| tp->snd_wl1 = qemu_get_be32(f); | |
| tp->snd_wl2 = qemu_get_be32(f); | |
| tp->iss = qemu_get_be32(f); | |
| tp->snd_wnd = qemu_get_be32(f); | |
| tp->rcv_wnd = qemu_get_be32(f); | |
| tp->rcv_nxt = qemu_get_be32(f); | |
| tp->rcv_up = qemu_get_be32(f); | |
| tp->irs = qemu_get_be32(f); | |
| tp->rcv_adv = qemu_get_be32(f); | |
| tp->snd_max = qemu_get_be32(f); | |
| tp->snd_cwnd = qemu_get_be32(f); | |
| tp->snd_ssthresh = qemu_get_be32(f); | |
| tp->t_idle = qemu_get_sbe16(f); | |
| tp->t_rtt = qemu_get_sbe16(f); | |
| tp->t_rtseq = qemu_get_be32(f); | |
| tp->t_srtt = qemu_get_sbe16(f); | |
| tp->t_rttvar = qemu_get_sbe16(f); | |
| tp->t_rttmin = qemu_get_be16(f); | |
| tp->max_sndwnd = qemu_get_be32(f); | |
| tp->t_oobflags = qemu_get_byte(f); | |
| tp->t_iobc = qemu_get_byte(f); | |
| tp->t_softerror = qemu_get_sbe16(f); | |
| tp->snd_scale = qemu_get_byte(f); | |
| tp->rcv_scale = qemu_get_byte(f); | |
| tp->request_r_scale = qemu_get_byte(f); | |
| tp->requested_s_scale = qemu_get_byte(f); | |
| tp->ts_recent = qemu_get_be32(f); | |
| tp->ts_recent_age = qemu_get_be32(f); | |
| tp->last_ack_sent = qemu_get_be32(f); | |
| tcp_template(tp); | |
| } | |
| static int slirp_sbuf_load(QEMUFile *f, struct sbuf *sbuf) | |
| { | |
| uint32_t off, sb_cc, sb_datalen; | |
| sb_cc = qemu_get_be32(f); | |
| sb_datalen = qemu_get_be32(f); | |
| sbreserve(sbuf, sb_datalen); | |
| if (sbuf->sb_datalen != sb_datalen) | |
| return -ENOMEM; | |
| sbuf->sb_cc = sb_cc; | |
| off = qemu_get_sbe32(f); | |
| sbuf->sb_wptr = sbuf->sb_data + off; | |
| off = qemu_get_sbe32(f); | |
| sbuf->sb_rptr = sbuf->sb_data + off; | |
| qemu_get_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); | |
| return 0; | |
| } | |
| static int slirp_socket_load(QEMUFile *f, struct socket *so) | |
| { | |
| if (tcp_attach(so) < 0) | |
| return -ENOMEM; | |
| so->so_urgc = qemu_get_be32(f); | |
| so->so_faddr.s_addr = qemu_get_be32(f); | |
| so->so_laddr.s_addr = qemu_get_be32(f); | |
| so->so_fport = qemu_get_be16(f); | |
| so->so_lport = qemu_get_be16(f); | |
| so->so_iptos = qemu_get_byte(f); | |
| so->so_emu = qemu_get_byte(f); | |
| so->so_type = qemu_get_byte(f); | |
| so->so_state = qemu_get_be32(f); | |
| if (slirp_sbuf_load(f, &so->so_rcv) < 0) | |
| return -ENOMEM; | |
| if (slirp_sbuf_load(f, &so->so_snd) < 0) | |
| return -ENOMEM; | |
| slirp_tcp_load(f, so->so_tcpcb); | |
| return 0; | |
| } | |
| static void slirp_bootp_load(QEMUFile *f, Slirp *slirp) | |
| { | |
| int i; | |
| for (i = 0; i < NB_BOOTP_CLIENTS; i++) { | |
| slirp->bootp_clients[i].allocated = qemu_get_be16(f); | |
| qemu_get_buffer(f, slirp->bootp_clients[i].macaddr, 6); | |
| } | |
| } | |
| static int slirp_state_load(QEMUFile *f, void *opaque, int version_id) | |
| { | |
| Slirp *slirp = opaque; | |
| struct ex_list *ex_ptr; | |
| while (qemu_get_byte(f)) { | |
| int ret; | |
| struct socket *so = socreate(slirp); | |
| if (!so) | |
| return -ENOMEM; | |
| ret = slirp_socket_load(f, so); | |
| if (ret < 0) | |
| return ret; | |
| if ((so->so_faddr.s_addr & slirp->vnetwork_mask.s_addr) != | |
| slirp->vnetwork_addr.s_addr) { | |
| return -EINVAL; | |
| } | |
| for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) { | |
| if (ex_ptr->ex_pty == 3 && | |
| so->so_faddr.s_addr == ex_ptr->ex_addr.s_addr && | |
| so->so_fport == ex_ptr->ex_fport) { | |
| break; | |
| } | |
| } | |
| if (!ex_ptr) | |
| return -EINVAL; | |
| so->extra = (void *)ex_ptr->ex_exec; | |
| } | |
| if (version_id >= 2) { | |
| slirp->ip_id = qemu_get_be16(f); | |
| } | |
| if (version_id >= 3) { | |
| slirp_bootp_load(f, slirp); | |
| } | |
| return 0; | |
| } |