diff options
Diffstat (limited to 'slirp/slirp.c')
| -rw-r--r-- | slirp/slirp.c | 1207 |
1 files changed, 1207 insertions, 0 deletions
diff --git a/slirp/slirp.c b/slirp/slirp.c new file mode 100644 index 00000000..35f819af --- /dev/null +++ b/slirp/slirp.c @@ -0,0 +1,1207 @@ +/* + * 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(); + + 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 = { + .fd = so->s, + .events = G_IO_IN | G_IO_HUP | G_IO_ERR, + }; + 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 = { + .fd = so->s, + .events = G_IO_OUT | G_IO_ERR, + }; + 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 = { + .fd = so->s, + .events = events, + }; + 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 = { + .fd = so->s, + .events = G_IO_IN | G_IO_HUP | G_IO_ERR, + }; + 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 = { + .fd = so->s, + .events = G_IO_IN | G_IO_HUP | G_IO_ERR, + }; + 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 = 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) { + close(so->s); + sofree(so); + return 0; + } + } + + return -1; +} + +int slirp_add_hostfwd(Slirp *slirp, int is_udp, struct in_addr host_addr, + int host_port, struct in_addr guest_addr, int guest_port) +{ + if (!guest_addr.s_addr) { + guest_addr = slirp->vdhcp_startaddr; + } + if (is_udp) { + if (!udp_listen(slirp, host_addr.s_addr, htons(host_port), + guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) + return -1; + } else { + if (!tcp_listen(slirp, host_addr.s_addr, htons(host_port), + guest_addr.s_addr, htons(guest_port), SS_HOSTFWD)) + return -1; + } + return 0; +} + +int slirp_add_exec(Slirp *slirp, int do_pty, const void *args, + struct in_addr *guest_addr, int guest_port) +{ + if (!guest_addr->s_addr) { + guest_addr->s_addr = slirp->vnetwork_addr.s_addr | + (htonl(0x0204) & ~slirp->vnetwork_mask.s_addr); + } + if ((guest_addr->s_addr & slirp->vnetwork_mask.s_addr) != + slirp->vnetwork_addr.s_addr || + guest_addr->s_addr == slirp->vhost_addr.s_addr || + guest_addr->s_addr == slirp->vnameserver_addr.s_addr) { + return -1; + } + return add_exec(&slirp->exec_list, do_pty, (char *)args, *guest_addr, + htons(guest_port)); +} + +ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags) +{ + if (so->s == -1 && so->extra) { + qemu_chr_fe_write(so->extra, buf, len); + return len; + } + + return send(so->s, buf, len, flags); +} + +static struct socket * +slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port) +{ + struct socket *so; + + for (so = slirp->tcb.so_next; so != &slirp->tcb; so = so->so_next) { + if (so->so_faddr.s_addr == guest_addr.s_addr && + htons(so->so_fport) == guest_port) { + return so; + } + } + return NULL; +} + +size_t slirp_socket_can_recv(Slirp *slirp, struct in_addr guest_addr, + int guest_port) +{ + struct iovec iov[2]; + struct socket *so; + + so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); + + if (!so || so->so_state & SS_NOFDREF) { + return 0; + } + + if (!CONN_CANFRCV(so) || so->so_snd.sb_cc >= (so->so_snd.sb_datalen/2)) { + return 0; + } + + return sopreprbuf(so, iov, NULL); +} + +void slirp_socket_recv(Slirp *slirp, struct in_addr guest_addr, int guest_port, + const uint8_t *buf, int size) +{ + int ret; + struct socket *so = slirp_find_ctl_socket(slirp, guest_addr, guest_port); + + if (!so) + return; + + ret = soreadbuf(so, (const char *)buf, size); + + if (ret > 0) + tcp_output(sototcpcb(so)); +} + +static void slirp_tcp_save(QEMUFile *f, struct tcpcb *tp) +{ + int i; + + qemu_put_sbe16(f, tp->t_state); + for (i = 0; i < TCPT_NTIMERS; i++) + qemu_put_sbe16(f, tp->t_timer[i]); + qemu_put_sbe16(f, tp->t_rxtshift); + qemu_put_sbe16(f, tp->t_rxtcur); + qemu_put_sbe16(f, tp->t_dupacks); + qemu_put_be16(f, tp->t_maxseg); + qemu_put_sbyte(f, tp->t_force); + qemu_put_be16(f, tp->t_flags); + qemu_put_be32(f, tp->snd_una); + qemu_put_be32(f, tp->snd_nxt); + qemu_put_be32(f, tp->snd_up); + qemu_put_be32(f, tp->snd_wl1); + qemu_put_be32(f, tp->snd_wl2); + qemu_put_be32(f, tp->iss); + qemu_put_be32(f, tp->snd_wnd); + qemu_put_be32(f, tp->rcv_wnd); + qemu_put_be32(f, tp->rcv_nxt); + qemu_put_be32(f, tp->rcv_up); + qemu_put_be32(f, tp->irs); + qemu_put_be32(f, tp->rcv_adv); + qemu_put_be32(f, tp->snd_max); + qemu_put_be32(f, tp->snd_cwnd); + qemu_put_be32(f, tp->snd_ssthresh); + qemu_put_sbe16(f, tp->t_idle); + qemu_put_sbe16(f, tp->t_rtt); + qemu_put_be32(f, tp->t_rtseq); + qemu_put_sbe16(f, tp->t_srtt); + qemu_put_sbe16(f, tp->t_rttvar); + qemu_put_be16(f, tp->t_rttmin); + qemu_put_be32(f, tp->max_sndwnd); + qemu_put_byte(f, tp->t_oobflags); + qemu_put_byte(f, tp->t_iobc); + qemu_put_sbe16(f, tp->t_softerror); + qemu_put_byte(f, tp->snd_scale); + qemu_put_byte(f, tp->rcv_scale); + qemu_put_byte(f, tp->request_r_scale); + qemu_put_byte(f, tp->requested_s_scale); + qemu_put_be32(f, tp->ts_recent); + qemu_put_be32(f, tp->ts_recent_age); + qemu_put_be32(f, tp->last_ack_sent); +} + +static void slirp_sbuf_save(QEMUFile *f, struct sbuf *sbuf) +{ + uint32_t off; + + qemu_put_be32(f, sbuf->sb_cc); + qemu_put_be32(f, sbuf->sb_datalen); + off = (uint32_t)(sbuf->sb_wptr - sbuf->sb_data); + qemu_put_sbe32(f, off); + off = (uint32_t)(sbuf->sb_rptr - sbuf->sb_data); + qemu_put_sbe32(f, off); + qemu_put_buffer(f, (unsigned char*)sbuf->sb_data, sbuf->sb_datalen); +} + +static void slirp_socket_save(QEMUFile *f, struct socket *so) +{ + qemu_put_be32(f, so->so_urgc); + qemu_put_be32(f, so->so_faddr.s_addr); + qemu_put_be32(f, so->so_laddr.s_addr); + qemu_put_be16(f, so->so_fport); + qemu_put_be16(f, so->so_lport); + qemu_put_byte(f, so->so_iptos); + qemu_put_byte(f, so->so_emu); + qemu_put_byte(f, so->so_type); + qemu_put_be32(f, so->so_state); + slirp_sbuf_save(f, &so->so_rcv); + slirp_sbuf_save(f, &so->so_snd); + slirp_tcp_save(f, so->so_tcpcb); +} + +static void slirp_bootp_save(QEMUFile *f, Slirp *slirp) +{ + int i; + + for (i = 0; i < NB_BOOTP_CLIENTS; i++) { + qemu_put_be16(f, slirp->bootp_clients[i].allocated); + qemu_put_buffer(f, slirp->bootp_clients[i].macaddr, 6); + } +} + +static void slirp_state_save(QEMUFile *f, void *opaque) +{ + Slirp *slirp = opaque; + struct ex_list *ex_ptr; + + for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) + if (ex_ptr->ex_pty == 3) { + struct socket *so; + so = slirp_find_ctl_socket(slirp, ex_ptr->ex_addr, + ntohs(ex_ptr->ex_fport)); + if (!so) + continue; + + qemu_put_byte(f, 42); + slirp_socket_save(f, so); + } + qemu_put_byte(f, 0); + + qemu_put_be16(f, slirp->ip_id); + + slirp_bootp_save(f, slirp); +} + +static void slirp_tcp_load(QEMUFile *f, struct tcpcb *tp) +{ + int i; + + tp->t_state = qemu_get_sbe16(f); + for (i = 0; i < TCPT_NTIMERS; i++) + tp->t_timer[i] = qemu_get_sbe16(f); + tp->t_rxtshift = qemu_get_sbe16(f); + tp->t_rxtcur = qemu_get_sbe16(f); + tp->t_dupacks = qemu_get_sbe16(f); + tp->t_maxseg = qemu_get_be16(f); + tp->t_force = qemu_get_sbyte(f); + tp->t_flags = qemu_get_be16(f); + 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; +} |