/* $NetBSD: ip_sfil.c,v 1.6 2000/08/09 21:03:02 veego Exp $ */ /* * Copyright (C) 1993-2000 by Darren Reed. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and due credit is given * to the original author and the contributors. * * I hate legaleese, don't you ? */ #if !defined(lint) static const char sccsid[] = "%W% %G% (C) 1993-2000 Darren Reed"; static const char rcsid[] = "@(#)Id: ip_sfil.c,v 2.23.2.6 2000/08/07 12:36:19 darrenr Exp"; #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ip_compat.h" #ifdef USE_INET6 # include #endif #include "ip_fil.h" #include "ip_state.h" #include "ip_nat.h" #include "ip_frag.h" #include "ip_auth.h" #include "ip_proxy.h" #include #ifndef MIN #define MIN(a,b) (((a)<(b))?(a):(b)) #endif extern fr_flags, fr_active; int fr_running = 0; int ipl_unreach = ICMP_UNREACH_HOST; u_long ipl_frouteok[2] = {0, 0}; static int frzerostats __P((caddr_t)); static int frrequest __P((minor_t, int, caddr_t, int)); static int send_ip __P((fr_info_t *fin, mblk_t *m)); kmutex_t ipl_mutex, ipf_authmx, ipf_rw, ipf_hostmap; KRWLOCK_T ipf_mutex, ipfs_mutex, ipf_solaris; KRWLOCK_T ipf_frag, ipf_state, ipf_nat, ipf_natfrag, ipf_auth; kcondvar_t iplwait, ipfauthwait; int ipldetach() { int i; #ifdef IPFDEBUG cmn_err(CE_CONT, "ipldetach()\n"); #endif #ifdef IPFILTER_LOG for (i = IPL_LOGMAX; i >= 0; i--) ipflog_clear(i); #endif i = FR_INQUE|FR_OUTQUE; (void) frflush(IPL_LOGIPF, FR_INQUE|FR_OUTQUE); ipfr_unload(); fr_stateunload(); ip_natunload(); cv_destroy(&iplwait); cv_destroy(&ipfauthwait); mutex_destroy(&ipf_hostmap); mutex_destroy(&ipf_authmx); mutex_destroy(&ipl_mutex); mutex_destroy(&ipf_rw); RW_DESTROY(&ipf_mutex); RW_DESTROY(&ipf_frag); RW_DESTROY(&ipf_state); RW_DESTROY(&ipf_natfrag); RW_DESTROY(&ipf_nat); RW_DESTROY(&ipf_auth); RW_DESTROY(&ipfs_mutex); /* NOTE: This lock is acquired in ipf_detach */ RWLOCK_EXIT(&ipf_solaris); RW_DESTROY(&ipf_solaris); return 0; } int iplattach __P((void)) { #ifdef IPFDEBUG cmn_err(CE_CONT, "iplattach()\n"); #endif bzero((char *)frcache, sizeof(frcache)); mutex_init(&ipf_rw, "ipf rw mutex", MUTEX_DRIVER, NULL); mutex_init(&ipl_mutex, "ipf log mutex", MUTEX_DRIVER, NULL); mutex_init(&ipf_authmx, "ipf auth log mutex", MUTEX_DRIVER, NULL); mutex_init(&ipf_hostmap, "ipf hostmap mutex", MUTEX_DRIVER, NULL); RWLOCK_INIT(&ipf_solaris, "ipf filter load/unload mutex", NULL); RWLOCK_INIT(&ipf_mutex, "ipf filter rwlock", NULL); RWLOCK_INIT(&ipfs_mutex, "ipf solaris mutex", NULL); RWLOCK_INIT(&ipf_frag, "ipf fragment rwlock", NULL); RWLOCK_INIT(&ipf_state, "ipf IP state rwlock", NULL); RWLOCK_INIT(&ipf_nat, "ipf IP NAT rwlock", NULL); RWLOCK_INIT(&ipf_natfrag, "ipf IP NAT-Frag rwlock", NULL); RWLOCK_INIT(&ipf_auth, "ipf IP User-Auth rwlock", NULL); cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL); cv_init(&ipfauthwait, "ipf auth condvar", CV_DRIVER, NULL); #ifdef IPFILTER_LOG ipflog_init(); #endif if (nat_init() == -1) return -1; if (fr_stateinit() == -1) return -1; if (appr_init() == -1) return -1; return 0; } static int frzerostats(data) caddr_t data; { friostat_t fio; int error; fr_getstat(&fio); error = IWCOPYPTR((caddr_t)&fio, data, sizeof(fio)); if (error) return error; bzero((char *)frstats, sizeof(*frstats) * 2); return 0; } /* * Filter ioctl interface. */ int iplioctl(dev, cmd, data, mode, cp, rp) dev_t dev; int cmd; #if SOLARIS2 >= 7 intptr_t data; #else int *data; #endif int mode; cred_t *cp; int *rp; { int error = 0, tmp; minor_t unit; #ifdef IPFDEBUG cmn_err(CE_CONT, "iplioctl(%x,%x,%x,%d,%x,%d)\n", dev, cmd, data, mode, cp, rp); #endif unit = getminor(dev); if (IPL_LOGMAX < unit) return ENXIO; if (fr_running <= 0) return 0; READ_ENTER(&ipf_solaris); if (unit == IPL_LOGNAT) { error = nat_ioctl((caddr_t)data, cmd, mode); RWLOCK_EXIT(&ipf_solaris); return error; } if (unit == IPL_LOGSTATE) { error = fr_state_ioctl((caddr_t)data, cmd, mode); RWLOCK_EXIT(&ipf_solaris); return error; } if (unit == IPL_LOGAUTH) { error = fr_auth_ioctl((caddr_t)data, cmd, NULL, NULL); RWLOCK_EXIT(&ipf_solaris); return error; } switch (cmd) { case SIOCFRENB : { u_int enable; if (!(mode & FWRITE)) error = EPERM; else error = IRCOPY((caddr_t)data, (caddr_t)&enable, sizeof(enable)); break; } case SIOCSETFF : if (!(mode & FWRITE)) error = EPERM; else { WRITE_ENTER(&ipf_mutex); error = IRCOPY((caddr_t)data, (caddr_t)&fr_flags, sizeof(fr_flags)); RWLOCK_EXIT(&ipf_mutex); } break; case SIOCGETFF : error = IWCOPY((caddr_t)&fr_flags, (caddr_t)data, sizeof(fr_flags)); if (error) error = EFAULT; break; case SIOCINAFR : case SIOCRMAFR : case SIOCADAFR : case SIOCZRLST : if (!(mode & FWRITE)) error = EPERM; else error = frrequest(unit, cmd, (caddr_t)data, fr_active); break; case SIOCINIFR : case SIOCRMIFR : case SIOCADIFR : if (!(mode & FWRITE)) error = EPERM; else error = frrequest(unit, cmd, (caddr_t)data, 1 - fr_active); break; case SIOCSWAPA : if (!(mode & FWRITE)) error = EPERM; else { WRITE_ENTER(&ipf_mutex); bzero((char *)frcache, sizeof(frcache[0]) * 2); error = IWCOPY((caddr_t)&fr_active, (caddr_t)data, sizeof(fr_active)); if (error) error = EFAULT; fr_active = 1 - fr_active; RWLOCK_EXIT(&ipf_mutex); } break; case SIOCGETFS : { friostat_t fio; READ_ENTER(&ipf_mutex); fr_getstat(&fio); RWLOCK_EXIT(&ipf_mutex); error = IWCOPYPTR((caddr_t)&fio, (caddr_t)data, sizeof(fio)); if (error) error = EFAULT; break; } case SIOCFRZST : if (!(mode & FWRITE)) error = EPERM; else error = frzerostats((caddr_t)data); break; case SIOCIPFFL : if (!(mode & FWRITE)) error = EPERM; else { error = IRCOPY((caddr_t)data, (caddr_t)&tmp, sizeof(tmp)); if (!error) { tmp = frflush(unit, tmp); error = IWCOPY((caddr_t)&tmp, (caddr_t)data, sizeof(tmp)); if (error) error = EFAULT; } } break; case SIOCSTLCK : error = IRCOPY((caddr_t)data, (caddr_t)&tmp, sizeof(tmp)); if (!error) { fr_state_lock = tmp; fr_nat_lock = tmp; fr_frag_lock = tmp; fr_auth_lock = tmp; } else error = EFAULT; break; #ifdef IPFILTER_LOG case SIOCIPFFB : if (!(mode & FWRITE)) error = EPERM; else { tmp = ipflog_clear(unit); error = IWCOPY((caddr_t)&tmp, (caddr_t)data, sizeof(tmp)); if (error) error = EFAULT; } break; #endif /* IPFILTER_LOG */ case SIOCFRSYN : if (!(mode & FWRITE)) error = EPERM; else error = ipfsync(); break; case SIOCGFRST : error = IWCOPYPTR((caddr_t)ipfr_fragstats(), (caddr_t)data, sizeof(ipfrstat_t)); break; case FIONREAD : { #ifdef IPFILTER_LOG int copy = (int)iplused[IPL_LOGIPF]; error = IWCOPY((caddr_t)©, (caddr_t)data, sizeof(copy)); if (error) error = EFAULT; #endif break; } default : error = EINVAL; break; } RWLOCK_EXIT(&ipf_solaris); return error; } ill_t *get_unit(name, v) char *name; int v; { size_t len = strlen(name) + 1; /* includes \0 */ ill_t *il; int sap; if (v == 4) sap = 0x0800; else if (v == 6) sap = 0x86dd; else return NULL; for (il = ill_g_head; il; il = il->ill_next) if ((len == il->ill_name_length) && (il->ill_sap == sap) && !strncmp(il->ill_name, name, len)) return il; return NULL; } static int frrequest(unit, req, data, set) minor_t unit; int req, set; caddr_t data; { register frentry_t *fp, *f, **fprev; register frentry_t **ftail; frentry_t fr; frdest_t *fdp; frgroup_t *fg = NULL; u_int *p, *pp; int error = 0, in; u_32_t group; ill_t *ill; ipif_t *ipif; ire_t *ire; fp = &fr; error = IRCOPYPTR(data, (caddr_t)fp, sizeof(*fp)); if (error) return EFAULT; fp->fr_ref = 0; #if SOLARIS2 >= 8 if (fp->fr_v == 4) fp->fr_sap = IP_DL_SAP; else if (fp->fr_v == 6) fp->fr_sap = IP6_DL_SAP; else return EINVAL; #else fp->fr_sap = 0; #endif WRITE_ENTER(&ipf_mutex); /* * Check that the group number does exist and that if a head group * has been specified, doesn't exist. */ if ((req != SIOCZRLST) && fp->fr_grhead && fr_findgroup(fp->fr_grhead, fp->fr_flags, unit, set, NULL)) { error = EEXIST; goto out; } if ((req != SIOCZRLST) && fp->fr_group && !fr_findgroup(fp->fr_group, fp->fr_flags, unit, set, NULL)) { error = ESRCH; goto out; } in = (fp->fr_flags & FR_INQUE) ? 0 : 1; if (unit == IPL_LOGAUTH) ftail = fprev = &ipauth; else if ((fp->fr_flags & FR_ACCOUNT) && (fp->fr_v == 4)) ftail = fprev = &ipacct[in][set]; else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) && (fp->fr_v == 4)) ftail = fprev = &ipfilter[in][set]; #ifdef USE_INET6 else if ((fp->fr_flags & FR_ACCOUNT) && (fp->fr_v == 6)) ftail = fprev = &ipacct6[in][set]; else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) && (fp->fr_v == 6)) ftail = fprev = &ipfilter6[in][set]; #endif else { error = ESRCH; goto out; } group = fp->fr_group; if (group != NULL) { fg = fr_findgroup(group, fp->fr_flags, unit, set, NULL); if (fg == NULL) { error = ESRCH; goto out; } ftail = fprev = fg->fg_start; } bzero((char *)frcache, sizeof(frcache[0]) * 2); if (*fp->fr_ifname) { fp->fr_ifa = (void *)get_unit((char *)fp->fr_ifname, (int)fp->fr_v); if (!fp->fr_ifa) fp->fr_ifa = (struct ifnet *)-1; } fdp = &fp->fr_dif; fp->fr_flags &= ~FR_DUP; if (*fdp->fd_ifname) { ill = get_unit(fdp->fd_ifname, (int)fp->fr_v); if (!ill) ire = (ire_t *)-1; else if ((ipif = ill->ill_ipif) && (fp->fr_v == 4)) { #if SOLARIS2 > 5 ire = ire_ctable_lookup(ipif->ipif_local_addr, 0, IRE_LOCAL, NULL, NULL, MATCH_IRE_TYPE); #else ire = ire_lookup_myaddr(ipif->ipif_local_addr); #endif if (!ire) ire = (ire_t *)-1; else fp->fr_flags |= FR_DUP; } #ifdef USE_INET6 else if ((ipif = ill->ill_ipif) && (fp->fr_v == 6)) { ire = ire_ctable_lookup_v6(&ipif->ipif_v6lcl_addr, 0, IRE_LOCAL, NULL, NULL, MATCH_IRE_TYPE); if (!ire) ire = (ire_t *)-1; else fp->fr_flags |= FR_DUP; } #endif fdp->fd_ifp = (struct ifnet *)ire; } fdp = &fp->fr_tif; if (*fdp->fd_ifname) { ill = get_unit(fdp->fd_ifname, (int)fp->fr_v); if (!ill) ire = (ire_t *)-1; else if ((ipif = ill->ill_ipif) && (fp->fr_v == 4)) { #if SOLARIS2 > 5 ire = ire_ctable_lookup(ipif->ipif_local_addr, 0, IRE_LOCAL, NULL, NULL, MATCH_IRE_TYPE); #else ire = ire_lookup_myaddr(ipif->ipif_local_addr); #endif if (!ire) ire = (ire_t *)-1; } #ifdef USE_INET6 else if ((ipif = ill->ill_ipif) && (fp->fr_v == 6)) { ire = ire_ctable_lookup_v6(&ipif->ipif_v6lcl_addr, 0, IRE_LOCAL, NULL, NULL, MATCH_IRE_TYPE); if (!ire) ire = (ire_t *)-1; } #endif fdp->fd_ifp = (struct ifnet *)ire; } /* * Look for a matching filter rule, but don't include the next or * interface pointer in the comparison (fr_next, fr_ifa). */ for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_ip, pp = &fp->fr_cksum; p < pp; p++) fp->fr_cksum += *p; for (; (f = *ftail); ftail = &f->fr_next) if ((fp->fr_cksum == f->fr_cksum) && !bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip, FR_CMPSIZ)) break; /* * If zero'ing statistics, copy current to caller and zero. */ if (req == SIOCZRLST) { if (!f) { error = ESRCH; goto out; } MUTEX_DOWNGRADE(&ipf_mutex); error = IWCOPYPTR((caddr_t)f, data, sizeof(*f)); if (error) goto out; f->fr_hits = 0; f->fr_bytes = 0; goto out; } if (!f) { if (req != SIOCINAFR && req != SIOCINIFR) while ((f = *ftail)) ftail = &f->fr_next; else { if (fp->fr_hits) { ftail = fprev; while (--fp->fr_hits && (f = *ftail)) ftail = &f->fr_next; } f = NULL; } } if (req == SIOCRMAFR || req == SIOCRMIFR) { if (!f) error = ESRCH; else { /* * Only return EBUSY if there is a group list, else * it's probably just state information referencing * the rule. */ if ((f->fr_ref > 1) && f->fr_grp) { error = EBUSY; goto out; } if (fg && fg->fg_head) fg->fg_head->fr_ref--; if (unit == IPL_LOGAUTH) { error = fr_auth_ioctl(data, req, fp, ftail); goto out; } if (f->fr_grhead) fr_delgroup(f->fr_grhead, fp->fr_flags, unit, set); fixskip(fprev, f, -1); *ftail = f->fr_next; f->fr_next = NULL; if (f->fr_ref == 0) KFREE(f); } } else { if (f) { error = EEXIST; } else { if (unit == IPL_LOGAUTH) { error = fr_auth_ioctl(data, req, fp, ftail); goto out; } KMALLOC(f, frentry_t *); if (f != NULL) { if (fg && fg->fg_head) fg->fg_head->fr_ref++; bcopy((char *)fp, (char *)f, sizeof(*f)); f->fr_ref = 1; f->fr_hits = 0; f->fr_next = *ftail; *ftail = f; if (req == SIOCINIFR || req == SIOCINAFR) fixskip(fprev, f, 1); f->fr_grp = NULL; group = f->fr_grhead; if (group != NULL) fg = fr_addgroup(group, f, unit, set); } else error = ENOMEM; } } out: RWLOCK_EXIT(&ipf_mutex); return (error); } /* * routines below for saving IP headers to buffer */ int iplopen(devp, flags, otype, cred) dev_t *devp; int flags, otype; cred_t *cred; { minor_t min = getminor(*devp); #ifdef IPFDEBUG cmn_err(CE_CONT, "iplopen(%x,%x,%x,%x)\n", devp, flags, otype, cred); #endif if ((fr_running <= 0) || !(otype & OTYP_CHR)) return ENXIO; min = (IPL_LOGMAX < min) ? ENXIO : 0; return min; } int iplclose(dev, flags, otype, cred) dev_t dev; int flags, otype; cred_t *cred; { minor_t min = getminor(dev); #ifdef IPFDEBUG cmn_err(CE_CONT, "iplclose(%x,%x,%x,%x)\n", dev, flags, otype, cred); #endif min = (IPL_LOGMAX < min) ? ENXIO : 0; return min; } #ifdef IPFILTER_LOG /* * iplread/ipllog * both of these must operate with at least splnet() lest they be * called during packet processing and cause an inconsistancy to appear in * the filter lists. */ int iplread(dev, uio, cp) dev_t dev; register struct uio *uio; cred_t *cp; { #ifdef IPFDEBUG cmn_err(CE_CONT, "iplread(%x,%x,%x)\n", dev, uio, cp); #endif return ipflog_read(getminor(dev), uio); } #endif /* IPFILTER_LOG */ /* * send_reset - this could conceivably be a call to tcp_respond(), but that * requires a large amount of setting up and isn't any more efficient. */ int send_reset(oip, fin) ip_t *oip; fr_info_t *fin; { tcphdr_t *tcp, *tcp2; int tlen = 0, hlen; mblk_t *m; #ifdef USE_INET6 ip6_t *ip6, *oip6 = (ip6_t *)oip; #endif ip_t *ip; tcp = (struct tcphdr *)fin->fin_dp; if (tcp->th_flags & TH_RST) return -1; if (tcp->th_flags & TH_SYN) tlen = 1; #ifdef USE_INET6 if (fin->fin_v == 6) hlen = sizeof(ip6_t); else #endif hlen = sizeof(ip_t); hlen += sizeof(*tcp2); if ((m = (mblk_t *)allocb(hlen + 16, BPRI_HI)) == NULL) return -1; m->b_rptr += 16; MTYPE(m) = M_DATA; m->b_wptr = m->b_rptr + hlen; bzero((char *)m->b_rptr, hlen); tcp2 = (struct tcphdr *)(m->b_rptr + hlen - sizeof(*tcp2)); tcp2->th_dport = tcp->th_sport; tcp2->th_sport = tcp->th_dport; tcp2->th_ack = htonl(ntohl(tcp->th_seq) + tlen); tcp2->th_seq = tcp->th_ack; tcp2->th_off = sizeof(struct tcphdr) >> 2; tcp2->th_flags = TH_RST|TH_ACK; /* * This is to get around a bug in the Solaris 2.4/2.5 TCP checksum * computation that is done by their put routine. */ tcp2->th_sum = htons(0x14); #ifdef USE_INET6 if (fin->fin_v == 6) { ip6 = (ip6_t *)m->b_rptr; ip6->ip6_src = oip6->ip6_dst; ip6->ip6_dst = oip6->ip6_src; ip6->ip6_plen = htons(sizeof(*tcp)); ip6->ip6_nxt = IPPROTO_TCP; } else #endif { ip = (ip_t *)m->b_rptr; ip->ip_src.s_addr = oip->ip_dst.s_addr; ip->ip_dst.s_addr = oip->ip_src.s_addr; ip->ip_hl = sizeof(*ip) >> 2; ip->ip_p = IPPROTO_TCP; ip->ip_len = htons(sizeof(*ip) + sizeof(*tcp)); ip->ip_tos = oip->ip_tos; } return send_ip(fin, m); } int static send_ip(fin, m) fr_info_t *fin; mblk_t *m; { RWLOCK_EXIT(&ipfs_mutex); RWLOCK_EXIT(&ipf_solaris); #ifdef USE_INET6 if (fin->fin_v == 6) { extern void ip_wput_v6 __P((queue_t *, mblk_t *)); ip6_t *ip6; ip6 = (ip6_t *)m->b_rptr; ip6->ip6_flow = 0; ip6->ip6_vfc = 0x60; ip6->ip6_hlim = 127; ip_wput_v6(((qif_t *)fin->fin_qif)->qf_ill->ill_wq, m); } else #endif { ip_t *ip; ip = (ip_t *)m->b_rptr; ip->ip_v = IPVERSION; ip->ip_ttl = 60; ip_wput(((qif_t *)fin->fin_qif)->qf_ill->ill_wq, m); } READ_ENTER(&ipf_solaris); READ_ENTER(&ipfs_mutex); return 0; } int send_icmp_err(oip, type, fin, dst) ip_t *oip; int type; fr_info_t *fin; int dst; { struct in_addr dst4; struct icmp *icmp; mblk_t *m, *mb; int hlen, code; qif_t *qif; u_short sz; #ifdef USE_INET6 ip6_t *ip6, *oip6; #endif ip_t *ip; if ((type < 0) || (type > ICMP_MAXTYPE)) return -1; code = fin->fin_icode; #ifdef USE_INET6 if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int))) return -1; #endif qif = fin->fin_qif; m = fin->fin_qfm; #ifdef USE_INET6 if (oip->ip_v == 6) { oip6 = (ip6_t *)oip; sz = sizeof(ip6_t); sz += MIN(m->b_wptr - m->b_rptr, 512); hlen = sizeof(ip6_t); type = icmptoicmp6types[type]; if (type == ICMP6_DST_UNREACH) code = icmptoicmp6unreach[code]; } else #endif { if ((oip->ip_p == IPPROTO_ICMP) && !(fin->fin_fi.fi_fl & FI_SHORT)) switch (ntohs(fin->fin_data[0]) >> 8) { case ICMP_ECHO : case ICMP_TSTAMP : case ICMP_IREQ : case ICMP_MASKREQ : break; default : return 0; } sz = sizeof(ip_t) * 2; sz += 8; /* 64 bits of data */ hlen = sz; } sz += offsetof(struct icmp, icmp_ip); if ((mb = (mblk_t *)allocb((size_t)sz + 16, BPRI_HI)) == NULL) return -1; MTYPE(mb) = M_DATA; mb->b_rptr += 16; mb->b_wptr = mb->b_rptr + sz; bzero((char *)mb->b_rptr, (size_t)sz); icmp = (struct icmp *)(mb->b_rptr + sizeof(*ip)); icmp->icmp_type = type; icmp->icmp_code = code; icmp->icmp_cksum = 0; #ifdef USE_INET6 if (oip->ip_v == 6) { struct in6_addr dst6; int csz; if (dst == 0) { if (fr_ifpaddr(6, ((qif_t *)fin->fin_qif)->qf_ill, (struct in_addr *)&dst6) == -1) return -1; } else dst6 = oip6->ip6_dst; csz = sz; sz -= sizeof(ip6_t); ip6 = (ip6_t *)mb->b_rptr; ip6->ip6_flow = 0; ip6->ip6_vfc = 0x60; ip6->ip6_hlim = 127; ip6->ip6_plen = htons(sz); ip6->ip6_nxt = IPPROTO_ICMPV6; ip6->ip6_src = dst6; ip6->ip6_dst = oip6->ip6_src; sz -= offsetof(struct icmp, icmp_ip); bcopy((char *)m->b_rptr, (char *)&icmp->icmp_ip, sz); icmp->icmp_cksum = csz - sizeof(ip6_t); } else #endif { ip = (ip_t *)mb->b_rptr; ip->ip_v = IPVERSION; ip->ip_hl = (sizeof(*ip) >> 2); ip->ip_p = IPPROTO_ICMP; ip->ip_id = oip->ip_id; ip->ip_sum = 0; ip->ip_ttl = 60; ip->ip_tos = oip->ip_tos; ip->ip_len = (u_short)htons(sz); if (dst == 0) { if (fr_ifpaddr(4, ((qif_t *)fin->fin_qif)->qf_ill, &dst4) == -1) return -1; } else dst4 = oip->ip_dst; ip->ip_src = dst4; ip->ip_dst = oip->ip_src; bcopy((char *)oip, (char *)&icmp->icmp_ip, sizeof(*oip)); bcopy((char *)oip + (oip->ip_hl << 2), (char *)&icmp->icmp_ip + sizeof(*oip), 8); icmp->icmp_cksum = ipf_cksum((u_short *)icmp, sizeof(*icmp) + 8); } /* * Need to exit out of these so we don't recursively call rw_enter * from fr_qout. */ return send_ip(fin, mb); }