+++ /dev/null
-/* SPDX-License-Identifier: MIT */
-/*
- * 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 "slirp.h"
-
-
-#ifndef _WIN32
-#include <net/if.h>
-#endif
-
-int slirp_debug;
-
-/* Define to 1 if you want KEEPALIVE timers */
-bool slirp_do_keepalive;
-
-/* 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
-};
-
-unsigned curtime;
-
-static struct in_addr dns_addr;
-#ifndef _WIN32
-static struct in6_addr dns6_addr;
-#endif
-static unsigned dns_addr_time;
-#ifndef _WIN32
-static unsigned dns6_addr_time;
-#endif
-
-#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", (unsigned)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;
-}
-
-int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
-{
- return -1;
-}
-
-static void winsock_cleanup(void)
-{
- WSACleanup();
-}
-
-#else
-
-static int get_dns_addr_cached(void *pdns_addr, void *cached_addr,
- socklen_t addrlen,
- struct stat *cached_stat, unsigned *cached_time)
-{
- struct stat old_stat;
- if (curtime - *cached_time < TIMEOUT_DEFAULT) {
- memcpy(pdns_addr, cached_addr, addrlen);
- return 0;
- }
- old_stat = *cached_stat;
- if (stat("/etc/resolv.conf", cached_stat) != 0) {
- return -1;
- }
- if (cached_stat->st_dev == old_stat.st_dev
- && cached_stat->st_ino == old_stat.st_ino
- && cached_stat->st_size == old_stat.st_size
- && cached_stat->st_mtime == old_stat.st_mtime) {
- memcpy(pdns_addr, cached_addr, addrlen);
- return 0;
- }
- return 1;
-}
-
-static int get_dns_addr_resolv_conf(int af, void *pdns_addr, void *cached_addr,
- socklen_t addrlen, uint32_t *scope_id,
- unsigned *cached_time)
-{
- char buff[512];
- char buff2[257];
- FILE *f;
- int found = 0;
- void *tmp_addr = alloca(addrlen);
- unsigned if_index;
-
- f = fopen("/etc/resolv.conf", "r");
- if (!f)
- return -1;
-
- DEBUG_MISC("IP address of your DNS(s):");
- while (fgets(buff, 512, f) != NULL) {
- if (sscanf(buff, "nameserver%*[ \t]%256s", buff2) == 1) {
- char *c = strchr(buff2, '%');
- if (c) {
- if_index = if_nametoindex(c + 1);
- *c = '\0';
- } else {
- if_index = 0;
- }
-
- if (!inet_pton(af, buff2, tmp_addr)) {
- continue;
- }
- /* If it's the first one, set it to dns_addr */
- if (!found) {
- memcpy(pdns_addr, tmp_addr, addrlen);
- memcpy(cached_addr, tmp_addr, addrlen);
- if (scope_id) {
- *scope_id = if_index;
- }
- *cached_time = curtime;
- }
-
- if (++found > 3) {
- DEBUG_MISC(" (more)");
- break;
- } else if (slirp_debug & DBG_MISC) {
- char s[INET6_ADDRSTRLEN];
- const char *res = inet_ntop(af, tmp_addr, s, sizeof(s));
- if (!res) {
- res = " (string conversion error)";
- }
- DEBUG_MISC(" %s", res);
- }
- }
- }
- fclose(f);
- if (!found)
- return -1;
- return 0;
-}
-
-int get_dns_addr(struct in_addr *pdns_addr)
-{
- static struct stat dns_addr_stat;
-
- if (dns_addr.s_addr != 0) {
- int ret;
- ret = get_dns_addr_cached(pdns_addr, &dns_addr, sizeof(dns_addr),
- &dns_addr_stat, &dns_addr_time);
- if (ret <= 0) {
- return ret;
- }
- }
- return get_dns_addr_resolv_conf(AF_INET, pdns_addr, &dns_addr,
- sizeof(dns_addr), NULL, &dns_addr_time);
-}
-
-int get_dns6_addr(struct in6_addr *pdns6_addr, uint32_t *scope_id)
-{
- static struct stat dns6_addr_stat;
-
- if (!in6_zero(&dns6_addr)) {
- int ret;
- ret = get_dns_addr_cached(pdns6_addr, &dns6_addr, sizeof(dns6_addr),
- &dns6_addr_stat, &dns6_addr_time);
- if (ret <= 0) {
- return ret;
- }
- }
- return get_dns_addr_resolv_conf(AF_INET6, pdns6_addr, &dns6_addr,
- sizeof(dns6_addr),
- scope_id, &dns6_addr_time);
-}
-
-#endif
-
-static void slirp_init_once(void)
-{
- static int initialized;
- const char *debug;
-#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);
-
- debug = g_getenv("SLIRP_DEBUG");
- if (debug) {
- const GDebugKey keys[] = {
- { "call", DBG_CALL },
- { "misc", DBG_MISC },
- { "error", DBG_ERROR },
- { "tftp", DBG_TFTP },
- };
- slirp_debug = g_parse_debug_string(debug, keys, G_N_ELEMENTS(keys));
- }
-
-
-}
-
-Slirp *slirp_init(int restricted, bool in_enabled, struct in_addr vnetwork,
- struct in_addr vnetmask, struct in_addr vhost,
- bool in6_enabled,
- struct in6_addr vprefix_addr6, uint8_t vprefix_len,
- struct in6_addr vhost6, const char *vhostname,
- const char *tftp_server_name,
- const char *tftp_path, const char *bootfile,
- struct in_addr vdhcp_start, struct in_addr vnameserver,
- struct in6_addr vnameserver6, const char **vdnssearch,
- const char *vdomainname,
- const SlirpCb *callbacks,
- void *opaque)
-{
- Slirp *slirp = g_malloc0(sizeof(Slirp));
-
- slirp_init_once();
-
- slirp->opaque = opaque;
- slirp->cb = callbacks;
- slirp->grand = g_rand_new();
- slirp->restricted = restricted;
-
- slirp->in_enabled = in_enabled;
- slirp->in6_enabled = in6_enabled;
-
- if_init(slirp);
- ip_init(slirp);
- ip6_init(slirp);
-
- /* Initialise mbufs *after* setting the MTU */
- m_init(slirp);
-
- slirp->vnetwork_addr = vnetwork;
- slirp->vnetwork_mask = vnetmask;
- slirp->vhost_addr = vhost;
- slirp->vprefix_addr6 = vprefix_addr6;
- slirp->vprefix_len = vprefix_len;
- slirp->vhost_addr6 = vhost6;
- if (vhostname) {
- slirp_pstrcpy(slirp->client_hostname, sizeof(slirp->client_hostname),
- vhostname);
- }
- slirp->tftp_prefix = g_strdup(tftp_path);
- slirp->bootp_filename = g_strdup(bootfile);
- slirp->vdomainname = g_strdup(vdomainname);
- slirp->vdhcp_startaddr = vdhcp_start;
- slirp->vnameserver_addr = vnameserver;
- slirp->vnameserver_addr6 = vnameserver6;
- slirp->tftp_server_name = g_strdup(tftp_server_name);
-
- if (vdnssearch) {
- translate_dnssearch(slirp, vdnssearch);
- }
-
- return slirp;
-}
-
-void slirp_cleanup(Slirp *slirp)
-{
- struct gfwd_list *e, *next;
-
- for (e = slirp->guestfwd_list; e; e = next) {
- next = e->ex_next;
- g_free(e->ex_exec);
- g_free(e);
- }
-
- ip_cleanup(slirp);
- ip6_cleanup(slirp);
- m_cleanup(slirp);
-
- g_rand_free(slirp->grand);
-
- g_free(slirp->vdnssearch);
- g_free(slirp->tftp_prefix);
- g_free(slirp->bootp_filename);
- g_free(slirp->vdomainname);
- 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(Slirp *slirp, uint32_t *timeout)
-{
- 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.
- */
- if (slirp->time_fasttimo) {
- *timeout = TIMEOUT_FAST;
- return;
- }
- if (slirp->do_slowtimo) {
- t = MIN(TIMEOUT_SLOW, t);
- }
- *timeout = t;
-}
-
-void slirp_pollfds_fill(Slirp *slirp, uint32_t *timeout,
- SlirpAddPollCb add_poll, void *opaque)
-{
- struct socket *so, *so_next;
-
- /*
- * First, TCP sockets
- */
-
- /*
- * *_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) {
- so->pollfds_idx = add_poll(so->s,
- SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
- continue;
- }
-
- /*
- * Set for writing sockets which are connecting
- */
- if (so->so_state & SS_ISFCONNECTING) {
- so->pollfds_idx = add_poll(so->s,
- SLIRP_POLL_OUT | SLIRP_POLL_ERR, opaque);
- 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 |= SLIRP_POLL_OUT | SLIRP_POLL_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 |= SLIRP_POLL_IN | SLIRP_POLL_HUP |
- SLIRP_POLL_ERR | SLIRP_POLL_PRI;
- }
-
- if (events) {
- so->pollfds_idx = add_poll(so->s, events, opaque);
- }
- }
-
- /*
- * 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) {
- so->pollfds_idx = add_poll(so->s,
- SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
- }
- }
-
- /*
- * 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) {
- so->pollfds_idx = add_poll(so->s,
- SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR, opaque);
- }
- }
-
- slirp_update_timeout(slirp, timeout);
-}
-
-void slirp_pollfds_poll(Slirp *slirp, int select_error,
- SlirpGetREventsCb get_revents, void *opaque)
-{
- struct socket *so, *so_next;
- int ret;
-
- curtime = slirp->cb->clock_get_ns(slirp->opaque) / SCALE_MS;
-
- /*
- * 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 = get_revents(so->pollfds_idx, opaque);
- }
-
- 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 SLIRP_POLL_IN below if this succeeds
- */
- if (revents & SLIRP_POLL_PRI) {
- ret = sorecvoob(so);
- if (ret < 0) {
- /* Socket error might have resulted in the socket being
- * removed, do not try to do anything more with it. */
- continue;
- }
- }
- /*
- * Check sockets for reading
- */
- else if (revents &
- (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_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));
- }
- if (ret < 0) {
- /* Socket error might have resulted in the socket being
- * removed, do not try to do anything more with it. */
- continue;
- }
- }
-
- /*
- * Check sockets for writing
- */
- if (!(so->so_state & SS_NOFDREF) &&
- (revents & (SLIRP_POLL_OUT | SLIRP_POLL_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,
- so->so_ffamily);
- /* continue; */
- } else {
- ret = sowrite(so);
- if (ret > 0) {
- /* Call tcp_output in case we need to send a window
- * update to the guest, otherwise it will be stuck
- * until it sends a window probe. */
- tcp_output(sototcpcb(so));
- }
- }
- }
- }
-
- /*
- * 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 = get_revents(so->pollfds_idx, opaque);
- }
-
- if (so->s != -1 &&
- (revents & (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_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 = get_revents(so->pollfds_idx, opaque);
- }
-
- if (so->s != -1 &&
- (revents & (SLIRP_POLL_IN | SLIRP_POLL_HUP | SLIRP_POLL_ERR))) {
- icmp_receive(so);
- }
- }
- }
-
- if_start(slirp);
-}
-
-static void arp_input(Slirp *slirp, const uint8_t *pkt, int pkt_len)
-{
- struct slirp_arphdr *ah = (struct slirp_arphdr *)(pkt + ETH_HLEN);
- uint8_t arp_reply[MAX(ETH_HLEN + sizeof(struct slirp_arphdr), 64)];
- struct ethhdr *reh = (struct ethhdr *)arp_reply;
- struct slirp_arphdr *rah = (struct slirp_arphdr *)(arp_reply + ETH_HLEN);
- int ar_op;
- struct gfwd_list *ex_ptr;
-
- if (!slirp->in_enabled) {
- return;
- }
-
- 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;
- /* TODO: IPv6 */
- for (ex_ptr = slirp->guestfwd_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_send_packet_all(slirp, 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 = (((uint16_t) pkt[12]) << 8) + pkt[13];
- switch(proto) {
- case ETH_P_ARP:
- arp_input(slirp, pkt, pkt_len);
- break;
- case ETH_P_IP:
- case ETH_P_IPV6:
- m = m_get(slirp);
- if (!m)
- return;
- /* Note: we add 2 to align the IP header on 4 bytes,
- * and add the margin for the tcpiphdr overhead */
- if (M_FREEROOM(m) < pkt_len + TCPIPHDR_DELTA + 2) {
- m_inc(m, pkt_len + TCPIPHDR_DELTA + 2);
- }
- m->m_len = pkt_len + TCPIPHDR_DELTA + 2;
- memcpy(m->m_data + TCPIPHDR_DELTA + 2, pkt, pkt_len);
-
- m->m_data += TCPIPHDR_DELTA + 2 + ETH_HLEN;
- m->m_len -= TCPIPHDR_DELTA + 2 + ETH_HLEN;
-
- if (proto == ETH_P_IP) {
- ip_input(m);
- } else if (proto == ETH_P_IPV6) {
- ip6_input(m);
- }
- break;
-
- case ETH_P_NCSI:
- ncsi_input(slirp, pkt, pkt_len);
- break;
-
- default:
- break;
- }
-}
-
-/* Prepare the IPv4 packet to be sent to the ethernet device. Returns 1 if no
- * packet should be sent, 0 if the packet must be re-queued, 2 if the packet
- * is ready to go.
- */
-static int if_encap4(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
- uint8_t ethaddr[ETH_ALEN])
-{
- const struct ip *iph = (const struct ip *)ifm->m_data;
-
- 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 slirp_arphdr)];
- struct ethhdr *reh = (struct ethhdr *)arp_req;
- struct slirp_arphdr *rah = (struct slirp_arphdr *)(arp_req + ETH_HLEN);
-
- if (!ifm->resolution_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_send_packet_all(slirp, arp_req, sizeof(arp_req));
- ifm->resolution_requested = true;
-
- /* Expire request and drop outgoing packet after 1 second */
- ifm->expiration_date =
- slirp->cb->clock_get_ns(slirp->opaque) + 1000000000ULL;
- }
- return 0;
- } else {
- 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);
-
- /* Send this */
- return 2;
- }
-}
-
-/* Prepare the IPv6 packet to be sent to the ethernet device. Returns 1 if no
- * packet should be sent, 0 if the packet must be re-queued, 2 if the packet
- * is ready to go.
- */
-static int if_encap6(Slirp *slirp, struct mbuf *ifm, struct ethhdr *eh,
- uint8_t ethaddr[ETH_ALEN])
-{
- const struct ip6 *ip6h = mtod(ifm, const struct ip6 *);
- if (!ndp_table_search(slirp, ip6h->ip_dst, ethaddr)) {
- if (!ifm->resolution_requested) {
- ndp_send_ns(slirp, ip6h->ip_dst);
- ifm->resolution_requested = true;
- ifm->expiration_date = slirp->cb->clock_get_ns(slirp->opaque) + 1000000000ULL;
- }
- return 0;
- } else {
- eh->h_proto = htons(ETH_P_IPV6);
- in6_compute_ethaddr(ip6h->ip_src, eh->h_source);
-
- /* Send this */
- return 2;
- }
-}
-
-/* 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;
- int ret;
-
- if (ifm->m_len + ETH_HLEN > sizeof(buf)) {
- return 1;
- }
-
- switch (iph->ip_v) {
- case IPVERSION:
- ret = if_encap4(slirp, ifm, eh, ethaddr);
- if (ret < 2) {
- return ret;
- }
- break;
-
- case IP6VERSION:
- ret = if_encap6(slirp, ifm, eh, ethaddr);
- if (ret < 2) {
- return ret;
- }
- break;
-
- default:
- g_assert_not_reached();
- break;
- }
-
- memcpy(eh->h_dest, ethaddr, ETH_ALEN);
- DEBUG_ARG("src = %02x:%02x:%02x:%02x:%02x:%02x",
- eh->h_source[0], eh->h_source[1], eh->h_source[2],
- eh->h_source[3], eh->h_source[4], eh->h_source[5]);
- DEBUG_ARG("dst = %02x:%02x:%02x:%02x:%02x:%02x",
- eh->h_dest[0], eh->h_dest[1], eh->h_dest[2],
- eh->h_dest[3], eh->h_dest[4], eh->h_dest[5]);
- memcpy(buf + sizeof(struct ethhdr), ifm->m_data, ifm->m_len);
- slirp_send_packet_all(slirp, buf, ifm->m_len + ETH_HLEN);
- return 1;
-}
-
-/* Drop host forwarding rule, return 0 if found. */
-/* TODO: IPv6 */
-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) {
- so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
- closesocket(so->s);
- sofree(so);
- return 0;
- }
- }
-
- return -1;
-}
-
-/* TODO: IPv6 */
-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;
-}
-
-/* TODO: IPv6 */
-static bool
-check_guestfwd(Slirp *slirp, struct in_addr *guest_addr, int guest_port)
-{
- struct gfwd_list *tmp_ptr;
-
- 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 false;
- }
-
- /* check if the port is "bound" */
- for (tmp_ptr = slirp->guestfwd_list; tmp_ptr; tmp_ptr = tmp_ptr->ex_next) {
- if (guest_port == tmp_ptr->ex_fport &&
- guest_addr->s_addr == tmp_ptr->ex_addr.s_addr)
- return false;
- }
-
- return true;
-}
-
-int slirp_add_exec(Slirp *slirp, const char *cmdline,
- struct in_addr *guest_addr, int guest_port)
-{
- if (!check_guestfwd(slirp, guest_addr, guest_port)) {
- return -1;
- }
-
- add_exec(&slirp->guestfwd_list, cmdline, *guest_addr, htons(guest_port));
- return 0;
-}
-
-int slirp_add_guestfwd(Slirp *slirp, SlirpWriteCb write_cb, void *opaque,
- struct in_addr *guest_addr, int guest_port)
-{
- if (!check_guestfwd(slirp, guest_addr, guest_port)) {
- return -1;
- }
-
- add_guestfwd(&slirp->guestfwd_list, write_cb, opaque,
- *guest_addr, htons(guest_port));
- return 0;
-}
-
-ssize_t slirp_send(struct socket *so, const void *buf, size_t len, int flags)
-{
- if (so->s == -1 && so->guestfwd) {
- /* XXX this blocks entire thread. Rewrite to use
- * qemu_chr_fe_write and background I/O callbacks */
- so->guestfwd->write_cb(buf, len, so->guestfwd->opaque);
- return len;
- }
-
- if (so->s == -1) {
- /*
- * This should in theory not happen but it is hard to be
- * sure because some code paths will end up with so->s == -1
- * on a failure but don't dispose of the struct socket.
- * Check specifically, so we don't pass -1 to send().
- */
- errno = EBADF;
- return -1;
- }
-
- return send(so->s, buf, len, flags);
-}
-
-struct socket *
-slirp_find_ctl_socket(Slirp *slirp, struct in_addr guest_addr, int guest_port)
-{
- struct socket *so;
-
- /* TODO: IPv6 */
- 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));
-}
-
-void slirp_send_packet_all(Slirp *slirp, const void *buf, size_t len)
-{
- ssize_t ret = slirp->cb->send_packet(buf, len, slirp->opaque);
-
- if (ret < 0) {
- g_critical("Failed to send packet, ret: %ld", (long) ret);
- } else if (ret < len) {
- DEBUG_ERROR("send_packet() didn't send all data: %ld < %lu",
- (long) ret, (unsigned long) len);
- }
-}
projects / mirror_qemu.git / blobdiff