Check for SYS/GL during library init. Reason is that

[AROS.git] / workbench / network / stacks / AROSTCP / bsdsocket / netinet / ip_icmp.c

/*
 * Copyright (C) 1993 AmiTCP/IP Group, <amitcp-group@hut.fi>
 *                    Helsinki University of Technology, Finland.
 *                    All rights reserved.
 * Copyright (C) 2005 Neil Cafferkey
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 *
 */

/*
 * Copyright (c) 1982, 1986, 1989 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 its contributors.
 * 4. 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   7.15 (Berkeley) 4/20/91
 */

#include <conf.h>

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
/*#include <sys/time.h>*/
#include <sys/kernel.h>

#include <net/route.h>
#include <net/if.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp_var.h>

#include <netinet/ip_icmp_protos.h>
#include <netinet/ip_input_protos.h>
#include <netinet/ip_output_protos.h>
#include <netinet/in_cksum_protos.h>
#include <netinet/in_protos.h>
#include <kern/uipc_domain_protos.h>
#include <net/raw_usrreq_protos.h>

struct  icmpstat icmpstat = { 0 };

/*
 * ICMP routines: error generation, receive packet processing, and
 * routines to turnaround packets back to the originator, and
 * host table maintenance routines.
 */
int     icmpprintfs = 0;        /* has effect only if ICMPPRINTFS is defined */

extern  struct protosw inetsw[];

/*
 * Generate an error packet of type error
 * in response to bad packet ip.
 */

void
icmp_error(n, type, code, dest)
        struct mbuf *n;
        int type, code;
        struct in_addr dest;
{
        register struct ip *oip = mtod(n, struct ip *), *nip;
        register unsigned oiplen = oip->ip_hl << 2;
        register struct icmp *icp;
        register struct mbuf *m;
        unsigned icmplen;

#ifdef ICMPPRINTFS
        if (icmpprintfs)
                printf("icmp_error(%lx, %ld, %ld)\n", (u_long)oip, type, code);
#endif
        if (type != ICMP_REDIRECT)
                icmpstat.icps_error++;
        /*
         * Don't send error if not the first fragment of message.
         * Don't error if the old packet protocol was ICMP
         * error message, only known informational types.
         */
        if (oip->ip_off &~ (IP_MF|IP_DF))
                goto freeit;
        if (oip->ip_p == IPPROTO_ICMP && type != ICMP_REDIRECT &&
          n->m_len >= oiplen + ICMP_MINLEN &&
          !ICMP_INFOTYPE(((struct icmp *)((caddr_t)oip + oiplen))->icmp_type)) {
                icmpstat.icps_oldicmp++;
                goto freeit;
        }

        /*
         * First, formulate icmp message
         */
        m = m_gethdr(M_DONTWAIT, MT_HEADER);
        if (m == NULL)
                goto freeit;
        icmplen = oiplen + MIN(8, oip->ip_len);
        m->m_len = icmplen + ICMP_MINLEN;
        MH_ALIGN(m, m->m_len);
        icp = mtod(m, struct icmp *);
        if ((u_int)type > ICMP_MAXTYPE)
                panic("icmp_error");
        icmpstat.icps_outhist[type]++;
        icp->icmp_type = type;
        if (type == ICMP_REDIRECT)
                icp->icmp_gwaddr = dest;
        else
                icp->icmp_void = 0;
        if (type == ICMP_PARAMPROB) {
                icp->icmp_pptr = code;
                code = 0;
        }
        icp->icmp_code = code;
        aligned_bcopy((caddr_t)oip, (caddr_t)&icp->icmp_ip, icmplen);
        nip = &icp->icmp_ip;
        nip->ip_len = htons((u_short)(nip->ip_len + oiplen));

        /*
         * Now, copy old ip header (without options)
         * in front of icmp message.
         */
        if (m->m_data - sizeof(struct ip) < m->m_pktdat)
                panic("icmp len");
        m->m_data -= sizeof(struct ip);
        m->m_len += sizeof(struct ip);
        m->m_pkthdr.len = m->m_len;
        m->m_pkthdr.rcvif = n->m_pkthdr.rcvif;
        nip = mtod(m, struct ip *);
        aligned_bcopy((caddr_t)oip, (caddr_t)nip, oiplen);
        nip->ip_len = m->m_len;
        nip->ip_hl = sizeof(struct ip) >> 2;
        nip->ip_p = IPPROTO_ICMP;
        icmp_reflect(m);

freeit:
        m_freem(n);
}

static struct sockproto icmproto = { AF_INET, IPPROTO_ICMP };
static struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET };
static struct sockaddr_in icmpdst = { sizeof (struct sockaddr_in), AF_INET };
static struct sockaddr_in icmpgw = { sizeof (struct sockaddr_in), AF_INET };
struct sockaddr_in icmpmask = { 8, 0 };
struct in_ifaddr *ifptoia();

/*
 * Process a received ICMP message.
 */
void icmp_input(void *arg, ...)
{
        register struct mbuf *m = arg;
        register struct icmp *icp;
        register struct ip *ip = mtod(m, struct ip *);
        int icmplen = ip->ip_len;
        register int i;
        struct in_ifaddr *ia;
        int code;
        extern u_char ip_protox[];
        extern struct in_addr in_makeaddr();
        int hlen;
        va_list va;


        va_start(va, arg);
        hlen = va_arg(va, int);
        va_end(va);
        /*
         * Locate icmp structure in mbuf, and check
         * that not corrupted and of at least minimum length.
         */
#ifdef ICMPPRINTFS
        if (icmpprintfs)
                printf("icmp_input from %lx, len %ld\n", ip->ip_src.s_addr, icmplen);
#endif
        if (icmplen < ICMP_MINLEN) {
                icmpstat.icps_tooshort++;
                goto freeit;
        }
        i = hlen + MIN(icmplen, ICMP_ADVLENMIN);
        if (m->m_len < i && (m = m_pullup(m, i)) == 0)  {
                icmpstat.icps_tooshort++;
                return;
        }
        ip = mtod(m, struct ip *);
        m->m_len -= hlen;
        m->m_data += hlen;
        icp = mtod(m, struct icmp *);
        if (in_cksum(m, icmplen)) {
                icmpstat.icps_checksum++;
                goto freeit;
        }
        m->m_len += hlen;
        m->m_data -= hlen;

#ifdef ICMPPRINTFS
        /*
         * Message type specific processing.
         */
        if (icmpprintfs)
                printf("icmp_input, type %ld code %ld\n", icp->icmp_type,
                    icp->icmp_code);
#endif
        if (icp->icmp_type > ICMP_MAXTYPE)
                goto raw;
        icmpstat.icps_inhist[icp->icmp_type]++;
        code = icp->icmp_code;
        switch (icp->icmp_type) {

        case ICMP_UNREACH:
                if (code > 5)
                        goto badcode;
                code += PRC_UNREACH_NET;
                goto deliver;

        case ICMP_TIMXCEED:
                if (code > 1)
                        goto badcode;
                code += PRC_TIMXCEED_INTRANS;
                goto deliver;

        case ICMP_PARAMPROB:
                if (code)
                        goto badcode;
                code = PRC_PARAMPROB;
                goto deliver;

        case ICMP_SOURCEQUENCH:
                if (code)
                        goto badcode;
                code = PRC_QUENCH;
        deliver:
                /*
                 * Problem with datagram; advise higher level routines.
                 */
                if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) ||
                    icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) {
                        icmpstat.icps_badlen++;
                        goto freeit;
                }
                NTOHS(icp->icmp_ip.ip_len);
#ifdef ICMPPRINTFS
                if (icmpprintfs)
                        printf("deliver to protocol %ld\n", icp->icmp_ip.ip_p);
#endif
                icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
                if (inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput)
                        (*inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput)
                          (code, (struct sockaddr *)&icmpsrc,
                           (caddr_t) &icp->icmp_ip);
                break;

        badcode:
                icmpstat.icps_badcode++;
                break;

        case ICMP_ECHO:
                icp->icmp_type = ICMP_ECHOREPLY;
                goto reflect;

        case ICMP_TSTAMP:
                if (icmplen < ICMP_TSLEN) {
                        icmpstat.icps_badlen++;
                        break;
                }
                icp->icmp_type = ICMP_TSTAMPREPLY;
                icp->icmp_rtime = iptime();
                icp->icmp_ttime = icp->icmp_rtime;      /* bogus, do later! */
                goto reflect;
                
        case ICMP_IREQ:
#define satosin(sa)     ((struct sockaddr_in *)(sa))
                if (in_netof(ip->ip_src) == 0 &&
                    (ia = ifptoia(m->m_pkthdr.rcvif)))
                        ip->ip_src = in_makeaddr(in_netof(IA_SIN(ia)->sin_addr),
                            in_lnaof(ip->ip_src));
                icp->icmp_type = ICMP_IREQREPLY;
                goto reflect;

        case ICMP_MASKREQ:
                if (icmplen < ICMP_MASKLEN ||
                    (ia = ifptoia(m->m_pkthdr.rcvif)) == 0)
                        break;
                icp->icmp_type = ICMP_MASKREPLY;
                icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr;
                if (ip->ip_src.s_addr == 0) {
                        if (ia->ia_ifp->if_flags & IFF_BROADCAST)
                            ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr;
                        else if (ia->ia_ifp->if_flags & IFF_POINTOPOINT)
                            ip->ip_src = satosin(&ia->ia_dstaddr)->sin_addr;
                }
reflect:
                ip->ip_len += hlen;     /* since ip_input deducts this */
                icmpstat.icps_reflect++;
                icmpstat.icps_outhist[icp->icmp_type]++;
                icmp_reflect(m);
                return;

        case ICMP_REDIRECT:
                if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp)) {
                        icmpstat.icps_badlen++;
                        break;
                }
                /*
                 * Short circuit routing redirects to force
                 * immediate change in the kernel's routing
                 * tables.  The message is also handed to anyone
                 * listening on a raw socket (e.g. the routing
                 * daemon for use in updating its tables).
                 */
                icmpgw.sin_addr = ip->ip_src;
                icmpdst.sin_addr = icp->icmp_gwaddr;
#ifdef  ICMPPRINTFS
                if (icmpprintfs)
                        printf("redirect dst %lx to %lx\n", icp->icmp_ip.ip_dst.s_addr,
                                icp->icmp_gwaddr.s_addr);
#endif
                if (code == ICMP_REDIRECT_NET || code == ICMP_REDIRECT_TOSNET) {
                        u_long in_netof();
                        icmpsrc.sin_addr =
                         in_makeaddr(in_netof(icp->icmp_ip.ip_dst), INADDR_ANY);
                        in_sockmaskof(icp->icmp_ip.ip_dst, &icmpmask);
                        rtredirect((struct sockaddr *)&icmpsrc,
                          (struct sockaddr *)&icmpdst,
                          (struct sockaddr *)&icmpmask, RTF_GATEWAY,
                          (struct sockaddr *)&icmpgw, (struct rtentry **)0);
                        icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
                        pfctlinput(PRC_REDIRECT_NET,
                          (struct sockaddr *)&icmpsrc);
                } else {
                        icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
                        rtredirect((struct sockaddr *)&icmpsrc,
                          (struct sockaddr *)&icmpdst,
                          (struct sockaddr *)0, RTF_GATEWAY | RTF_HOST,
                          (struct sockaddr *)&icmpgw, (struct rtentry **)0);
                        pfctlinput(PRC_REDIRECT_HOST,
                          (struct sockaddr *)&icmpsrc);
                }
                break;

        /*
         * No kernel processing for the following;
         * just fall through to send to raw listener.
         */
        case ICMP_ECHOREPLY:
        case ICMP_TSTAMPREPLY:
        case ICMP_IREQREPLY:
        case ICMP_MASKREPLY:
        default:
                break;
        }

raw:
        icmpsrc.sin_addr = ip->ip_src;
        icmpdst.sin_addr = ip->ip_dst;
        (void) raw_input(m, &icmproto, (struct sockaddr *)&icmpsrc,
            (struct sockaddr *)&icmpdst);
        return;

freeit:
        m_freem(m);
}

/*
 * Reflect the ip packet back to the source
 */
void
icmp_reflect(m)
        struct mbuf *m;
{
        register struct ip *ip = mtod(m, struct ip *);
        register struct in_ifaddr *ia;
        struct in_addr t;
        struct mbuf *opts = 0;
        int optlen = (ip->ip_hl << 2) - sizeof(struct ip);

        t = ip->ip_dst;
        ip->ip_dst = ip->ip_src;
        /*
         * If the incoming packet was addressed directly to us,
         * use dst as the src for the reply.  Otherwise (broadcast
         * or anonymous), use the address which corresponds
         * to the incoming interface.
         */
        for (ia = in_ifaddr; ia; ia = ia->ia_next) {
                if (t.s_addr == IA_SIN(ia)->sin_addr.s_addr)
                        break;
                if ((ia->ia_ifp->if_flags & IFF_BROADCAST) &&
                    t.s_addr == satosin(&ia->ia_broadaddr)->sin_addr.s_addr)
                        break;
        }
        if (ia == (struct in_ifaddr *)0)
                ia = ifptoia(m->m_pkthdr.rcvif);
        if (ia == (struct in_ifaddr *)0)
                ia = in_ifaddr;
        t = IA_SIN(ia)->sin_addr;
        ip->ip_src = t;
        ip->ip_ttl = MAXTTL;

        if (optlen > 0) {
                register u_char *cp;
                int opt, cnt;
                u_int len;

                /*
                 * Retrieve any source routing from the incoming packet;
                 * add on any record-route or timestamp options.
                 */
                cp = (u_char *) (ip + 1);
                if ((opts = ip_srcroute()) == 0 &&
                    (opts = m_gethdr(M_DONTWAIT, MT_HEADER))) {
                        opts->m_len = sizeof(struct in_addr);
                        mtod(opts, struct in_addr *)->s_addr = 0;
                }
                if (opts) {
#ifdef ICMPPRINTFS
                    if (icmpprintfs)
                            printf("icmp_reflect optlen %ld rt %ld => ",
                                optlen, opts->m_len);
#endif
                    for (cnt = optlen; cnt > 0; cnt -= len, cp += len) {
                            opt = cp[IPOPT_OPTVAL];
                            if (opt == IPOPT_EOL)
                                    break;
                            if (opt == IPOPT_NOP)
                                    len = 1;
                            else {
                                    len = cp[IPOPT_OLEN];
                                    if (len <= 0 || len > cnt)
                                            break;
                            }
                            /*
                             * should check for overflow, but it "can't happen"
                             */
                            if (opt == IPOPT_RR || opt == IPOPT_TS) {
                                    bcopy((caddr_t)cp,
                                        mtod(opts, caddr_t) + opts->m_len, len);
                                    opts->m_len += len;
                            }
                    }
                    if (opts->m_len % 4 != 0) {
                            *(mtod(opts, caddr_t) + opts->m_len) = IPOPT_EOL;
                            opts->m_len++;
                    }
#ifdef ICMPPRINTFS
                    if (icmpprintfs)
                            printf("%ld\n", opts->m_len);
#endif
                }
                /*
                 * Now strip out original options by copying rest of first
                 * mbuf's data back, and adjust the IP length.
                 */
                ip->ip_len -= optlen;
                ip->ip_hl = sizeof(struct ip) >> 2;
                m->m_len -= optlen;
                if (m->m_flags & M_PKTHDR)
                        m->m_pkthdr.len -= optlen;
                optlen += sizeof(struct ip);
                bcopy((caddr_t)ip + optlen, (caddr_t)(ip + 1),
                         (unsigned)(m->m_len - sizeof(struct ip)));
        }
        icmp_send(m, opts);
        if (opts)
                (void)m_free(opts);
}

struct in_ifaddr *
ifptoia(ifp)
        struct ifnet *ifp;
{
        register struct in_ifaddr *ia;

        for (ia = in_ifaddr; ia; ia = ia->ia_next)
                if (ia->ia_ifp == ifp)
                        return (ia);
        return ((struct in_ifaddr *)0);
}

/*
 * Send an icmp packet back to the ip level,
 * after supplying a checksum.
 */
void
icmp_send(m, opts)
        register struct mbuf *m;
        struct mbuf *opts;
{
        register struct ip *ip = mtod(m, struct ip *);
        register int hlen;
        register struct icmp *icp;

        hlen = ip->ip_hl << 2;
        m->m_data += hlen;
        m->m_len -= hlen;
        icp = mtod(m, struct icmp *);
        icp->icmp_cksum = 0;
        icp->icmp_cksum = in_cksum(m, ip->ip_len - hlen);
        m->m_data -= hlen;
        m->m_len += hlen;
#ifdef ICMPPRINTFS
        if (icmpprintfs)
                printf("icmp_send dst %lx src %lx\n", ip->ip_dst.s_addr, ip->ip_src.s_addr);
#endif
        (void) ip_output(m, opts, (struct route *)0, 0);
}

n_time
iptime()
{
        struct timeval atv;
        u_long t;

        GetSysTime(&atv);
        t = (atv.tv_sec % (24*60*60)) * 1000 + atv.tv_usec / 1000;
        return (htonl(t));
}