NetBSD/dist/ipf/ip_sfil.c

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2001-03-26 10:11:46 +04:00
/* $NetBSD: ip_sfil.c,v 1.7 2001/03/26 06:11:46 mike 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";
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static const char rcsid[] = "@(#)Id: ip_sfil.c,v 2.23.2.9 2000/11/12 11:55:17 darrenr Exp";
#endif
#include <sys/types.h>
#include <sys/errno.h>
#include <sys/param.h>
#include <sys/cpuvar.h>
#include <sys/open.h>
#include <sys/ioctl.h>
#include <sys/filio.h>
#include <sys/systm.h>
#include <sys/cred.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
#include <sys/ksynch.h>
#include <sys/kmem.h>
#include <sys/mkdev.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/dditypes.h>
#include <sys/cmn_err.h>
#include <net/if.h>
#include <net/af.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/tcpip.h>
#include <netinet/ip_icmp.h>
#include "ip_compat.h"
#ifdef USE_INET6
# include <netinet/icmp6.h>
#endif
#include "ip_fil.h"
#include "ip_state.h"
#include "ip_nat.h"
#include "ip_frag.h"
#include "ip_auth.h"
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#include "ip_proxy.h"
#include <inet/ip_ire.h>
#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));
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static int send_ip __P((fr_info_t *fin, mblk_t *m));
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kmutex_t ipl_mutex, ipf_authmx, ipf_rw;
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_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);
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)
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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));
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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));
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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));
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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));
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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)&copy, (caddr_t)data, sizeof(copy));
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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;
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if (group != 0) {
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;
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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));
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if (error)
goto out;
f->fr_hits = 0;
f->fr_bytes = 0;
goto out;
}
if (!f) {
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if (req != SIOCINAFR && req != SIOCINIFR)
while ((f = *ftail))
ftail = &f->fr_next;
else {
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if (fp->fr_hits) {
ftail = fprev;
while (--fp->fr_hits && (f = *ftail))
ftail = &f->fr_next;
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}
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;
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if (group != 0)
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.
*/
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int send_reset(oip, fin)
ip_t *oip;
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fr_info_t *fin;
{
tcphdr_t *tcp, *tcp2;
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int tlen, 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;
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tlen = (tcp->th_flags & (TH_SYN|TH_FIN)) ? 1 : 0;
#ifdef USE_INET6
if (fin->fin_v == 6)
hlen = sizeof(ip6_t);
else
#endif
hlen = sizeof(ip_t);
hlen += sizeof(*tcp2);
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if ((m = (mblk_t *)allocb(hlen + 16, BPRI_HI)) == NULL)
return -1;
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m->b_rptr += 16;
MTYPE(m) = M_DATA;
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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;
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if (tcp->th_flags & TH_ACK) {
tcp2->th_seq = tcp->th_ack;
tcp2->th_flags = TH_RST|TH_ACK;
} else {
tcp2->th_ack = ntohl(tcp->th_seq);
tcp2->th_ack += tlen;
tcp2->th_ack = htonl(tcp2->th_ack);
tcp2->th_flags = TH_RST;
}
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;
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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;
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}
return send_ip(fin, m);
}
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int static send_ip(fin, m)
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fr_info_t *fin;
mblk_t *m;
{
RWLOCK_EXIT(&ipfs_mutex);
RWLOCK_EXIT(&ipf_solaris);
#ifdef USE_INET6
if (fin->fin_v == 6) {
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extern void ip_wput_v6 __P((queue_t *, mblk_t *));
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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;
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ip_wput(((qif_t *)fin->fin_qif)->qf_ill->ill_wq, m);
}
READ_ENTER(&ipf_solaris);
READ_ENTER(&ipfs_mutex);
return 0;
}
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int send_icmp_err(oip, type, fin, dst)
ip_t *oip;
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int type;
fr_info_t *fin;
int dst;
{
struct in_addr dst4;
struct icmp *icmp;
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mblk_t *m, *mb;
int hlen, code;
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qif_t *qif;
u_short sz;
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ill_t *il;
#ifdef USE_INET6
ip6_t *ip6, *oip6;
#endif
ip_t *ip;
if ((type < 0) || (type > ICMP_MAXTYPE))
return -1;
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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
{
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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);
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if ((mb = (mblk_t *)allocb((size_t)sz + 16, BPRI_HI)) == NULL)
return -1;
MTYPE(mb) = M_DATA;
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mb->b_rptr += 16;
mb->b_wptr = mb->b_rptr + sz;
bzero((char *)mb->b_rptr, (size_t)sz);
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icmp = (struct icmp *)(mb->b_rptr + sizeof(*ip));
icmp->icmp_type = type;
icmp->icmp_code = code;
icmp->icmp_cksum = 0;
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#ifdef icmp_nextmtu
if (type == ICMP_UNREACH && (il = qif->qf_ill) &&
fin->fin_icode == ICMP_UNREACH_NEEDFRAG)
icmp->icmp_nextmtu = htons(il->ill_max_frag);
#endif
#ifdef USE_INET6
if (oip->ip_v == 6) {
struct in6_addr dst6;
int csz;
if (dst == 0) {
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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) {
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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.
*/
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return send_ip(fin, mb);
}