build-sys: move slirp as git submodule project

The slirp project is now hosted on freedesktop at:
https://gitlab.freedesktop.org/slirp.

The libslirp source was extracted from qemu/slirp filtered through
clang-format (available in project tree). The qemu slirp directory can
be swapped by a git submodule.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20190424110041.8175-3-marcandre.lureau@redhat.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

2 files changed, 0 insertions, 470 deletions

diff --git a/slirp b/slirp
new file mode 160000
+Subproject 59a1b1f165458c2acb7ff0525b543945f741622
diff --git a/slirp/src/ip_icmp.c b/slirp/src/ip_icmp.c
deleted file mode 100644
index 1aea18afa7..0000000000
--- a/slirp/src/ip_icmp.c
+++ /dev/null
@@ -1,470 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Copyright (c) 1982, 1986, 1988, 1993
- *	The Regents of the University of California.  All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)ip_icmp.c	8.2 (Berkeley) 1/4/94
- * ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp
- */
-
-#include "slirp.h"
-#include "ip_icmp.h"
-
-#ifndef WITH_ICMP_ERROR_MSG
-#define WITH_ICMP_ERROR_MSG 0
-#endif
-
-/* The message sent when emulating PING */
-/* Be nice and tell them it's just a pseudo-ping packet */
-static const char icmp_ping_msg[] = "This is a pseudo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
-
-/* list of actions for icmp_send_error() on RX of an icmp message */
-static const int icmp_flush[19] = {
-/*  ECHO REPLY (0)  */   0,
-		         1,
-		         1,
-/* DEST UNREACH (3) */   1,
-/* SOURCE QUENCH (4)*/   1,
-/* REDIRECT (5) */       1,
-		         1,
-		         1,
-/* ECHO (8) */           0,
-/* ROUTERADVERT (9) */   1,
-/* ROUTERSOLICIT (10) */ 1,
-/* TIME EXCEEDED (11) */ 1,
-/* PARAMETER PROBLEM (12) */ 1,
-/* TIMESTAMP (13) */     0,
-/* TIMESTAMP REPLY (14) */ 0,
-/* INFO (15) */          0,
-/* INFO REPLY (16) */    0,
-/* ADDR MASK (17) */     0,
-/* ADDR MASK REPLY (18) */ 0
-};
-
-void icmp_init(Slirp *slirp)
-{
-    slirp->icmp.so_next = slirp->icmp.so_prev = &slirp->icmp;
-    slirp->icmp_last_so = &slirp->icmp;
-}
-
-void icmp_cleanup(Slirp *slirp)
-{
-    while (slirp->icmp.so_next != &slirp->icmp) {
-        icmp_detach(slirp->icmp.so_next);
-    }
-}
-
-static int icmp_send(struct socket *so, struct mbuf *m, int hlen)
-{
-    struct ip *ip = mtod(m, struct ip *);
-    struct sockaddr_in addr;
-
-    so->s = slirp_socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP);
-    if (so->s == -1) {
-        return -1;
-    }
-
-    so->so_m = m;
-    so->so_faddr = ip->ip_dst;
-    so->so_laddr = ip->ip_src;
-    so->so_iptos = ip->ip_tos;
-    so->so_type = IPPROTO_ICMP;
-    so->so_state = SS_ISFCONNECTED;
-    so->so_expire = curtime + SO_EXPIRE;
-
-    addr.sin_family = AF_INET;
-    addr.sin_addr = so->so_faddr;
-
-    insque(so, &so->slirp->icmp);
-
-    if (sendto(so->s, m->m_data + hlen, m->m_len - hlen, 0,
-               (struct sockaddr *)&addr, sizeof(addr)) == -1) {
-        DEBUG_MISC("icmp_input icmp sendto tx errno = %d-%s",
-                   errno, strerror(errno));
-        icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
-        icmp_detach(so);
-    }
-
-    return 0;
-}
-
-void icmp_detach(struct socket *so)
-{
-    so->slirp->cb->unregister_poll_fd(so->s, so->slirp->opaque);
-    closesocket(so->s);
-    sofree(so);
-}
-
-/*
- * Process a received ICMP message.
- */
-void
-icmp_input(struct mbuf *m, int hlen)
-{
-  register struct icmp *icp;
-  register struct ip *ip=mtod(m, struct ip *);
-  int icmplen=ip->ip_len;
-  Slirp *slirp = m->slirp;
-
-  DEBUG_CALL("icmp_input");
-  DEBUG_ARG("m = %p", m);
-  DEBUG_ARG("m_len = %d", m->m_len);
-
-  /*
-   * Locate icmp structure in mbuf, and check
-   * that its not corrupted and of at least minimum length.
-   */
-  if (icmplen < ICMP_MINLEN) {          /* min 8 bytes payload */
-  freeit:
-    m_free(m);
-    goto end_error;
-  }
-
-  m->m_len -= hlen;
-  m->m_data += hlen;
-  icp = mtod(m, struct icmp *);
-  if (cksum(m, icmplen)) {
-    goto freeit;
-  }
-  m->m_len += hlen;
-  m->m_data -= hlen;
-
-  DEBUG_ARG("icmp_type = %d", icp->icmp_type);
-  switch (icp->icmp_type) {
-  case ICMP_ECHO:
-    ip->ip_len += hlen;	             /* since ip_input subtracts this */
-    if (ip->ip_dst.s_addr == slirp->vhost_addr.s_addr ||
-        ip->ip_dst.s_addr == slirp->vnameserver_addr.s_addr) {
-        icmp_reflect(m);
-    } else if (slirp->restricted) {
-        goto freeit;
-    } else {
-      struct socket *so;
-      struct sockaddr_storage addr;
-      so = socreate(slirp);
-      if (icmp_send(so, m, hlen) == 0) {
-        return;
-      }
-      if (udp_attach(so, AF_INET) == -1) {
-	DEBUG_MISC("icmp_input udp_attach errno = %d-%s",
-               errno,strerror(errno));
-	sofree(so);
-	m_free(m);
-	goto end_error;
-      }
-      so->so_m = m;
-      so->so_ffamily = AF_INET;
-      so->so_faddr = ip->ip_dst;
-      so->so_fport = htons(7);
-      so->so_lfamily = AF_INET;
-      so->so_laddr = ip->ip_src;
-      so->so_lport = htons(9);
-      so->so_iptos = ip->ip_tos;
-      so->so_type = IPPROTO_ICMP;
-      so->so_state = SS_ISFCONNECTED;
-
-      /* Send the packet */
-      addr = so->fhost.ss;
-      sotranslate_out(so, &addr);
-
-      if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
-		(struct sockaddr *)&addr, sockaddr_size(&addr)) == -1) {
-	DEBUG_MISC("icmp_input udp sendto tx errno = %d-%s",
-               errno,strerror(errno));
-	icmp_send_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, 0, strerror(errno));
-	udp_detach(so);
-      }
-    } /* if ip->ip_dst.s_addr == alias_addr.s_addr */
-    break;
-  case ICMP_UNREACH:
-    /* XXX? report error? close socket? */
-  case ICMP_TIMXCEED:
-  case ICMP_PARAMPROB:
-  case ICMP_SOURCEQUENCH:
-  case ICMP_TSTAMP:
-  case ICMP_MASKREQ:
-  case ICMP_REDIRECT:
-    m_free(m);
-    break;
-
-  default:
-    m_free(m);
-  } /* swith */
-
-end_error:
-  /* m is m_free()'d xor put in a socket xor or given to ip_send */
-  return;
-}
-
-
-/*
- *	Send an ICMP message in response to a situation
- *
- *	RFC 1122: 3.2.2	MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
- *			MUST NOT change this header information.
- *			MUST NOT reply to a multicast/broadcast IP address.
- *			MUST NOT reply to a multicast/broadcast MAC address.
- *			MUST reply to only the first fragment.
- */
-/*
- * Send ICMP_UNREACH back to the source regarding msrc.
- * mbuf *msrc is used as a template, but is NOT m_free()'d.
- * It is reported as the bad ip packet.  The header should
- * be fully correct and in host byte order.
- * ICMP fragmentation is illegal.  All machines must accept 576 bytes in one
- * packet.  The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
- */
-
-#define ICMP_MAXDATALEN (IP_MSS-28)
-void
-icmp_send_error(struct mbuf *msrc, uint8_t type, uint8_t code, int minsize,
-           const char *message)
-{
-  unsigned hlen, shlen, s_ip_len;
-  register struct ip *ip;
-  register struct icmp *icp;
-  register struct mbuf *m;
-
-  DEBUG_CALL("icmp_send_error");
-  DEBUG_ARG("msrc = %p", msrc);
-  DEBUG_ARG("msrc_len = %d", msrc->m_len);
-
-  if(type!=ICMP_UNREACH && type!=ICMP_TIMXCEED) goto end_error;
-
-  /* check msrc */
-  if(!msrc) goto end_error;
-  ip = mtod(msrc, struct ip *);
-  if (slirp_debug & DBG_MISC) {
-    char bufa[20], bufb[20];
-    strcpy(bufa, inet_ntoa(ip->ip_src));
-    strcpy(bufb, inet_ntoa(ip->ip_dst));
-    DEBUG_MISC(" %.16s to %.16s", bufa, bufb);
-  }
-  if(ip->ip_off & IP_OFFMASK) goto end_error;    /* Only reply to fragment 0 */
-
-  /* Do not reply to source-only IPs */
-  if ((ip->ip_src.s_addr & htonl(~(0xf << 28))) == 0) {
-      goto end_error;
-  }
-
-  shlen=ip->ip_hl << 2;
-  s_ip_len=ip->ip_len;
-  if(ip->ip_p == IPPROTO_ICMP) {
-    icp = (struct icmp *)((char *)ip + shlen);
-    /*
-     *	Assume any unknown ICMP type is an error. This isn't
-     *	specified by the RFC, but think about it..
-     */
-    if(icp->icmp_type>18 || icmp_flush[icp->icmp_type]) goto end_error;
-  }
-
-  /* make a copy */
-  m = m_get(msrc->slirp);
-  if (!m) {
-      goto end_error;
-  }
-
-  { int new_m_size;
-    new_m_size=sizeof(struct ip )+ICMP_MINLEN+msrc->m_len+ICMP_MAXDATALEN;
-    if(new_m_size>m->m_size) m_inc(m, new_m_size);
-  }
-  memcpy(m->m_data, msrc->m_data, msrc->m_len);
-  m->m_len = msrc->m_len;                        /* copy msrc to m */
-
-  /* make the header of the reply packet */
-  ip  = mtod(m, struct ip *);
-  hlen= sizeof(struct ip );     /* no options in reply */
-
-  /* fill in icmp */
-  m->m_data += hlen;
-  m->m_len -= hlen;
-
-  icp = mtod(m, struct icmp *);
-
-  if(minsize) s_ip_len=shlen+ICMP_MINLEN;   /* return header+8b only */
-  else if(s_ip_len>ICMP_MAXDATALEN)         /* maximum size */
-    s_ip_len=ICMP_MAXDATALEN;
-
-  m->m_len=ICMP_MINLEN+s_ip_len;        /* 8 bytes ICMP header */
-
-  /* min. size = 8+sizeof(struct ip)+8 */
-
-  icp->icmp_type = type;
-  icp->icmp_code = code;
-  icp->icmp_id = 0;
-  icp->icmp_seq = 0;
-
-  memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len);   /* report the ip packet */
-  HTONS(icp->icmp_ip.ip_len);
-  HTONS(icp->icmp_ip.ip_id);
-  HTONS(icp->icmp_ip.ip_off);
-
-  if (message && WITH_ICMP_ERROR_MSG) { /* append message to ICMP packet */
-    int message_len;
-    char *cpnt;
-    message_len=strlen(message);
-    if(message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
-    cpnt=(char *)m->m_data+m->m_len;
-    memcpy(cpnt, message, message_len);
-    m->m_len+=message_len;
-  }
-
-  icp->icmp_cksum = 0;
-  icp->icmp_cksum = cksum(m, m->m_len);
-
-  m->m_data -= hlen;
-  m->m_len += hlen;
-
-  /* fill in ip */
-  ip->ip_hl = hlen >> 2;
-  ip->ip_len = m->m_len;
-
-  ip->ip_tos=((ip->ip_tos & 0x1E) | 0xC0);  /* high priority for errors */
-
-  ip->ip_ttl = MAXTTL;
-  ip->ip_p = IPPROTO_ICMP;
-  ip->ip_dst = ip->ip_src;    /* ip addresses */
-  ip->ip_src = m->slirp->vhost_addr;
-
-  (void ) ip_output((struct socket *)NULL, m);
-
-end_error:
-  return;
-}
-#undef ICMP_MAXDATALEN
-
-/*
- * Reflect the ip packet back to the source
- */
-void
-icmp_reflect(struct mbuf *m)
-{
-  register struct ip *ip = mtod(m, struct ip *);
-  int hlen = ip->ip_hl << 2;
-  int optlen = hlen - sizeof(struct ip );
-  register struct icmp *icp;
-
-  /*
-   * Send an icmp packet back to the ip level,
-   * after supplying a checksum.
-   */
-  m->m_data += hlen;
-  m->m_len -= hlen;
-  icp = mtod(m, struct icmp *);
-
-  icp->icmp_type = ICMP_ECHOREPLY;
-  icp->icmp_cksum = 0;
-  icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
-
-  m->m_data -= hlen;
-  m->m_len += hlen;
-
-  /* fill in ip */
-  if (optlen > 0) {
-    /*
-     * Strip out original options by copying rest of first
-     * mbuf's data back, and adjust the IP length.
-     */
-    memmove((char *)(ip + 1), (char *)ip + hlen,
-	    (unsigned )(m->m_len - hlen));
-    hlen -= optlen;
-    ip->ip_hl = hlen >> 2;
-    ip->ip_len -= optlen;
-    m->m_len -= optlen;
-  }
-
-  ip->ip_ttl = MAXTTL;
-  { /* swap */
-    struct in_addr icmp_dst;
-    icmp_dst = ip->ip_dst;
-    ip->ip_dst = ip->ip_src;
-    ip->ip_src = icmp_dst;
-  }
-
-  (void ) ip_output((struct socket *)NULL, m);
-}
-
-void icmp_receive(struct socket *so)
-{
-    struct mbuf *m = so->so_m;
-    struct ip *ip = mtod(m, struct ip *);
-    int hlen = ip->ip_hl << 2;
-    uint8_t error_code;
-    struct icmp *icp;
-    int id, len;
-
-    m->m_data += hlen;
-    m->m_len -= hlen;
-    icp = mtod(m, struct icmp *);
-
-    id = icp->icmp_id;
-    len = recv(so->s, icp, M_ROOM(m), 0);
-    /*
-     * The behavior of reading SOCK_DGRAM+IPPROTO_ICMP sockets is inconsistent
-     * between host OSes.  On Linux, only the ICMP header and payload is
-     * included.  On macOS/Darwin, the socket acts like a raw socket and
-     * includes the IP header as well.  On other BSDs, SOCK_DGRAM+IPPROTO_ICMP
-     * sockets aren't supported at all, so we treat them like raw sockets.  It
-     * isn't possible to detect this difference at runtime, so we must use an
-     * #ifdef to determine if we need to remove the IP header.
-     */
-#ifdef CONFIG_BSD
-    if (len >= sizeof(struct ip)) {
-        struct ip *inner_ip = mtod(m, struct ip *);
-        int inner_hlen = inner_ip->ip_hl << 2;
-        if (inner_hlen > len) {
-            len = -1;
-            errno = -EINVAL;
-        } else {
-            len -= inner_hlen;
-            memmove(icp, (unsigned char *)icp + inner_hlen, len);
-        }
-    } else {
-      len = -1;
-      errno = -EINVAL;
-    }
-#endif
-    icp->icmp_id = id;
-
-    m->m_data -= hlen;
-    m->m_len += hlen;
-
-    if (len == -1 || len == 0) {
-        if (errno == ENETUNREACH) {
-            error_code = ICMP_UNREACH_NET;
-        } else {
-            error_code = ICMP_UNREACH_HOST;
-        }
-        DEBUG_MISC(" udp icmp rx errno = %d-%s", errno,
-                   strerror(errno));
-        icmp_send_error(so->so_m, ICMP_UNREACH, error_code, 0, strerror(errno));
-    } else {
-        icmp_reflect(so->so_m);
-        so->so_m = NULL; /* Don't m_free() it again! */
-    }
-    icmp_detach(so);
-}