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net-ipv6.cpp

/*
 * net-ipv6.cc -- IPv6 Network  (based upon ip-net.cc)
 */

/*-
 * Copyright (c) 1993-1994 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and the Network Research Group at
 *      Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory 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.
 */

static const char rcsid[] =
    "@(#) $Header: /cs/research/mice/starship/src/local/CVS_repository/vic/net/net-ipv6.cpp,v 1.10 2003/04/24 14:53:26 ucackha Exp $";

#ifdef HAVE_IPV6

#include <stdio.h>
#include <errno.h>
#include <string.h>
#ifdef WIN32
#include <io.h>
#define close closesocket
#else
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#endif
#if defined(sun) && defined(__svr4__)
#include <sys/systeminfo.h>
#endif

#include "config.h"
#include "net.h"
#include "vic_tcl.h"
#include "inet_ntop.h"

#include "inet6.h"
#include "net-addr.h"

/* This is pretty nasty but it's the simplest way to get round */
/* the Detexis bug that means their MUSICA IPv6 stack uses     */
/* IPPROTO_IP instead of IPPROTO_IPV6 in setsockopt calls      */
/* We also need to define in6addr_any */
#ifdef  MUSICA_IPV6
#define     IPPROTO_IPV6      IPPROTO_IP
struct      in6_addr          in6addr_any = {IN6ADDR_ANY_INIT};
#endif

#if defined(FreeBSD)
#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP   IPV6_JOIN_GROUP
#endif
#endif

#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN (46)
#endif

class IP6Address : public Address {
  public:
      IP6Address() { text_ = new char[INET6_ADDRSTRLEN]; text_[0]='\0';};
      virtual int operator=(const char*);
      int operator=(const struct in6_addr& addr);

      virtual Address* copy() const;
      virtual size_t length() const { return sizeof(addr_);}
      virtual operator const void*() const { return &addr_;}

      // conversion from IP6Address to type struct in6_addr
      operator struct in6_addr() const { return addr_; }
      operator const struct in6_addr&() const { return addr_; }

  protected:
      struct in6_addr addr_;
};


static class IP6AddressType : public AddressType {
public:
  virtual Address* resolve(const char* name) {
  struct in6_addr addr;
    IP6Address * result = 0;
    if (inet6_LookupHostAddr(&addr, name) >= 0) {
      result = new IP6Address;
      *result = addr;
    } else {
      result = 0;
    }
    return (result);
  }
} ip6_address_type;


class IP6Network : public Network {
  public:
        IP6Network() : Network(*(new IP6Address), *(new IP6Address))  {;}
      virtual int command(int argc, const char*const* argv);
      virtual void reset();
      virtual Address* alloc(const char* name) { 
            struct in6_addr addr;
            IP6Address * result = 0;
            if (inet6_LookupHostAddr(&addr, name) >= 0) {
              result = new IP6Address;
              *result = addr;
            } else {
              result = 0;
            }
            return (result);
      }
  protected:
      virtual int dorecv(u_char* buf, int len, Address& from, int fd);
      int open(const char * host, int port, int ttl);
      int close();
      int localname(sockaddr_in6*);
      int openssock(Address & addr, u_short port, int ttl);
      int openrsock(Address & addr, u_short port, Address & local);
      time_t last_reset_;
      unsigned int flowLabel_;      /* Flowlabel for all traffic */
      int ifIndex_;           /* Interface index to bind to on all layers */
};

static class IP6NetworkMatcher : public Matcher {
    public:
      IP6NetworkMatcher() : Matcher("network") {}
      TclObject* match(const char* id) {
            if (strcasecmp(id, "ip6") == 0)
                  return (new IP6Network);
            else
                  return (0);
      }
} nm_ip6;

int IP6Address::operator=(const char* text)  {
  if (!inet6_LookupHostAddr(&addr_, text)) 
      return ((inet_ntop(AF_INET6, &addr_, text_, INET6_ADDRSTRLEN) != 0) ?
        (0) : (1));
  else {
      fprintf(stderr,"Error looking up: %s\n",text);
      exit(1);
  }
}

Address * IP6Address::copy() const {
  IP6Address * result = new IP6Address;
  *result = addr_;
  return (result);
}

int IP6Address::operator=(const struct in6_addr& addr) {
  memcpy(&addr_, &addr, sizeof(addr));
  return ((inet_ntop(AF_INET6, &addr_, text_, INET6_ADDRSTRLEN) != 0) ?
        (0) : (1));
}


int IP6Network::command(int argc, const char*const* argv)
{
      Tcl& tcl = Tcl::instance();
      if (argc == 2) {
            if (strcmp(argv[1], "close") == 0) {
                  close();
                  return (TCL_OK);
            }
            char* cp = tcl.result();
            if (strcmp(argv[1], "addr") == 0) {
/* __IPV6 use Address */
                  strcpy(cp, addr_);
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "interface") == 0) {
/* __IPV6 use Address */
                  strcpy(cp, local_);
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "port") == 0) {
                  sprintf(cp, "%d", ntohs(port_));
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "localport") == 0) {
                  sprintf(cp, "%d", ntohs(lport_));
                  return (TCL_OK);
            }
            if (strcmp(argv[1], "ttl") == 0) {
                  sprintf(cp, "%d", ttl_);
                  return (TCL_OK);
            }
/* __IPV6 use IN6_IS_ADDR */
            if (strcmp(argv[1], "ismulticast") == 0) {
                  const in6_addr & addr = (IP6Address&)addr_;
                  tcl.result(IN6_IS_ADDR_MULTICAST(&addr)? "1" : "0");
                  return (TCL_OK);
/* __IPV6 user IPV6_MULTICAST_LOOP */
            }
      } else if (argc == 3) {
            if (strcmp(argv[1], "loopback") == 0) {
                  char c = atoi(argv[2]);
                  if (setsockopt(ssock_, IPPROTO_IPV6, 
                               IPV6_MULTICAST_LOOP, &c, 1) < 0) {
                        /*
                         * If we cannot turn off loopback (Like on the
                         * Microsoft TCP/IP stack), then declare this
                         * option broken so that our packets can be
                         * filtered on the recv path.
                         */
                        if (c == 0)
                              noloopback_broken_ = 1;
                  }
                  return (TCL_OK);
            }
      } else if (argc == 5) {
            if (strcmp(argv[1], "open") == 0) {
/* __IPV6 use v6 lookup */
                  const char * host = argv[2];
                  int port = htons(atoi(argv[3]));
                  int ttl = atoi(argv[4]);
                  flowLabel_ = htonl(atoi(tcl.attr("flowLabel")));
                  ifIndex_ = atoi(tcl.attr("ifIndex"));
                  if (strlen(tcl.attr("ifAddr"))>1)
                        (IP6Address&)local_ = tcl.attr("ifAddr");
                  if (open(host, port, ttl) < 0)
                        tcl.result("0");
                  else
                        tcl.result("1");
                  return (TCL_OK);
            }
      }
      return (Network::command(argc, argv));
}

int IP6Network::open(const char * host, int port, int ttl)
{
      addr_ = host;
      port_ = port;
      ttl_ = ttl;

      ssock_ = openssock(addr_, port, ttl);
      if (ssock_ < 0)
            return (-1);
      /*
       * Connecting the send socket also bound the local address.
       * On a multihomed host we need to bind the receive socket
       * to the same local address the kernel has chosen to send on.
       */
      struct sockaddr_in6 local;
      if (localname(&local) < 0) {
            return (-1);
      }
      (IP6Address&)local_ = local.sin6_addr;

      rsock_ = openrsock(addr_, port, local_);
      if (rsock_ < 0) {
            (void)::close(ssock_);
            return (-1);
      }
      lport_ = local.sin6_port;
      last_reset_ = 0;
      return (0);
}

int IP6Network::close()
{
      if (ssock_ >= 0) {
            ::close(ssock_);
            ::close(rsock_);
            ssock_ = rsock_ = -1;
      }
      return (0);
}

int IP6Network::localname(sockaddr_in6* p) {

  memset((char *)p, 0, sizeof(*p));
  p->sin6_family = AF_INET6;
  socklen_t len = sizeof(*p), result = 0;

  if ((result = getsockname(ssock_, (struct sockaddr *)p, &len)) < 0) {
    perror("getsockname");
    p->sin6_addr = in6addr_any;
    p->sin6_port = 0;
  }
  /* This doesn't yield anything useful
  len = sizeof(p->sin6_addr);
  if (!getsockopt(ssock_, IPPROTO_IPV6, IP_MULTICAST_IF, (char *)&p->sin6_addr,&len))
                  return (0);
  */

      // Use Local name if already set via command line
      // But use port derived from getsockname
      if (((const char*)local_)[0]!='\0') {
            p->sin6_addr=(IP6Address&)local_;
            return (result);
      }

#ifdef MUSICA_IPV6
  if (IS_SAME_IN6_ADDR(p->sin6_addr, in6addr_any)) {
#else 
  if (IN6_ARE_ADDR_EQUAL(&(p->sin6_addr), &in6addr_any)) {
#endif
    result = inet6_LookupLocalAddr(&p->sin6_addr);
  }

  return (result);

}

void IP6Network::reset()
{
      time_t t = time(0);
      int d = int(t - last_reset_);
      if (d > 3) {
            last_reset_ = t;
            (void)::close(ssock_);
            ssock_ = openssock(addr_, port_, ttl_);
      }
}

int IP6Network::openrsock(Address & addr, u_short port, Address & local)
{
      int fd;
      struct sockaddr_in6 sin;

      fd = socket(AF_INET6, SOCK_DGRAM, 0);
      if (fd < 0) {
            perror("socket");
            exit(1);
      }
      nonblock(fd);
      int on = 1;
      if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&on,
                  sizeof(on)) < 0) {
            perror("SO_REUSEADDR");
      }
#ifdef SO_REUSEPORT
      on = 1;
      if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (char *)&on,
                   sizeof(on)) < 0) {
            perror("SO_REUSEPORT");
            exit(1);
      }
#endif
      memset((char *)&sin, 0, sizeof(sin));
      sin.sin6_family = AF_INET6;
      sin.sin6_addr = (IP6Address&)addr;
      sin.sin6_port = port;
#ifdef IPV6_ADD_MEMBERSHIP
      if (IN6_IS_ADDR_MULTICAST(&sin.sin6_addr)) {
            /*
             * Try to bind the multicast address as the socket
             * dest address.  On many systems this won't work
             * so fall back to a destination of INADDR_ANY if
             * the first bind fails.
             */
/* __IPV6 memcopy address */
            if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
                  sin.sin6_addr = in6addr_any;
                  if (bind(fd, (struct sockaddr*)&sin, sizeof(sin)) < 0) {
                        perror("bind");
                        exit(1);
                  }
            }
            /* 
             * XXX This is bogus multicast setup that really
             * shouldn't have to be done (group membership should be
             * implicit in the IP class D address, route should contain
             * ttl & no loopback flag, etc.).  Steve Deering has promised
             * to fix this for the 4.4bsd release.  We're all waiting
             * with bated breath.
             */
                struct ipv6_mreq mr;

/* __IPV6 memcopy address */
#ifdef MUSICA_IPV6
            mr.i6mr_interface = (ifIndex_<0)?0:ifIndex_;
            mr.i6mr_multiaddr = (IP6Address&)addr;
#else
            mr.ipv6mr_interface = (ifIndex_<0)?0:ifIndex_;
            mr.ipv6mr_multiaddr = (IP6Address&)addr;
#endif

            int mreqsize = sizeof(mr);
#ifdef WIN2K_IPV6
            mreqsize += 4;
#endif
            if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, 
                         (char *)&mr, mreqsize) < 0) {
                  perror("IPV6_ADD_MEMBERSHIP");
                  exit(1);
            }
      } else
#endif
      {
            /*
             * bind the local host's address to this socket.  If that
             * fails, another vic probably has the addresses bound so
             * just exit.
             */
/* __IPV6 memcopy address */
            sin.sin6_addr = (IP6Address&)local;
            if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
                  perror("bind");
                  exit(1);
            }
            /*
             * Despite several attempts on our part to get this fixed,
             * Microsoft Windows isn't complient with the Internet Host
             * Requirements standard (RFC-1122) and won't let us include
             * the source address in the receive socket demux state.
             * (The consequence of this is that all conversations have
             * to be assigned a unique local port so the vat 'side
             * conversation' (middle click on site name) function is
             * essentially useless under windows.)
             */
#ifndef WIN32
            /*
             * (try to) connect the foreign host's address to this socket.
             */
            sin.sin6_port = 0;
/* __IPV6 memcopy address */
            sin.sin6_addr = (IP6Address&)addr;
            connect(fd, (struct sockaddr *)&sin, sizeof(sin));
#endif
      }

      /*
       * XXX don't need this for the session socket.
       */   
      int bufsize = 80 * 1024;
      if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&bufsize,
                  sizeof(bufsize)) < 0) {
            bufsize = 32 * 1024;
            if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, (char *)&bufsize,
                        sizeof(bufsize)) < 0)
                  perror("SO_RCVBUF");
      }
      return (fd);
}     

int IP6Network::openssock(Address & addr, u_short port, int ttl) 
{
      int fd;
      struct sockaddr_in6 sin;


      fd = socket(AF_INET6, SOCK_DGRAM, 0);
      if (fd < 0) {
            perror("socket");
            exit(1);
      }
      nonblock(fd);

      memset((char *)&sin, 0, sizeof(sin));
      sin.sin6_family = AF_INET6;
      sin.sin6_port = 0;
      sin.sin6_flowinfo = flowLabel_;
/* __IPV6 memcopy address */
        // Use Local name if already set via command line
        if (((const char*)local_)[0]!='\0') {
            sin.sin6_addr = (IP6Address&)local_;
        } else {
            sin.sin6_addr = in6addr_any;
      }
      if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
            perror("bind");
            exit(1);
      }

      memset((char *)&sin, 0, sizeof(sin));
      sin.sin6_family = AF_INET6;
/* __IPV6 memcopy address */
      sin.sin6_addr = (IP6Address&)addr;
      sin.sin6_port = port;
      sin.sin6_flowinfo = flowLabel_;
      if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
            perror("connect");
            exit(1);
      }
      if (IN6_IS_ADDR_MULTICAST(&sin.sin6_addr)) {
#ifdef IPV6_ADD_MEMBERSHIP
            char c;

            /* turn off loopback */
            c = 0;
            if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &c, 1) < 0) {
                  /*
                   * If we cannot turn off loopback (Like on the
                   * Microsoft TCP/IP stack), then declare this
                   * option broken so that our packets can be
                   * filtered on the recv path.
                   */
                  if (c == 0)
                        noloopback_broken_ = 1;
            }
            /* set the multicast TTL */
            u_int t;
            t = (ttl > 255) ? 255 : (ttl < 0) ? 0 : ttl;

            if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
                         (const char*)&t, sizeof(t)) < 0) {
                  perror("IPV6_MULTICAST_HOPS");
                  exit(1);
            }
            if (ifIndex_!=-1) {
                  if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
                               (const char*)&ifIndex_, sizeof(ifIndex_)) < 0) {
                        perror("IPV6_MULTICAST_IF");
                        exit(1);
                  }
            }
#else
            fprintf(stderr, "\
not compiled with support for IP multicast\n\
you must specify a unicast destination\n");
            exit(1);
#endif
      }
      /*
       * XXX don't need this for the session socket.
       */
      int bufsize = 80 * 1024;
      if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&bufsize,
                   sizeof(bufsize)) < 0) {
            bufsize = 48 * 1024;
            if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, (char *)&bufsize,
                         sizeof(bufsize)) < 0)
                  perror("SO_SNDBUF");
      }
      return (fd);
}

int IP6Network::dorecv(u_char* buf, int len, Address& from, int fd)
{
      sockaddr_in6 sfrom;
      socklen_t fromlen = sizeof(sfrom);
      int cc = ::recvfrom(fd, (char*)buf, len, 0,
                      (sockaddr*)&sfrom, &fromlen);
      if (cc < 0) {
            if (errno != EWOULDBLOCK)
                  perror("recvfrom");
            return (-1);
      }
      (IP6Address&)from = sfrom.sin6_addr;

      /* Check for loopback - then compare last auto conf bit of addresses
       * XXX Probaby should do this at rtp level.
       */
      if (noloopback_broken_ && sfrom.sin6_port == lport_) {
            struct in6_addr local;
            local=(IP6Address&)local_;
            if (((sfrom.sin6_addr.s6_addr[12] == local.s6_addr[12]) &&
                   (sfrom.sin6_addr.s6_addr[13] == local.s6_addr[13]) &&
                   (sfrom.sin6_addr.s6_addr[14] == local.s6_addr[14]) &&
                   (sfrom.sin6_addr.s6_addr[15] == local.s6_addr[15])   ) ||
                   from == local_) {
                        return (0);
            }
      }
      return (cc);
}

#endif /* HAVE_IPV6 */

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