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freebsd-skq/sbin/ipfw/ipfw2.c
Luigi Rizzo c3e5b9f154 Implement the 'ipsec' option to match packets coming out of an ipsec tunnel. 
Should work with both regular and fast ipsec (mutually exclusive).
See manpage for more details.

Submitted by: Ari Suutari (ari.suutari@syncrontech.com)
Revised by: sam
MFC after: 1 week
2003-07-04 21:42:32 +00:00

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/*
* Copyright (c) 2002 Luigi Rizzo
* Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
* Copyright (c) 1994 Ugen J.S.Antsilevich
*
* Idea and grammar partially left from:
* Copyright (c) 1993 Daniel Boulet
*
* Redistribution and use in source forms, with and without modification,
* are permitted provided that this entire comment appears intact.
*
* Redistribution in binary form may occur without any restrictions.
* Obviously, it would be nice if you gave credit where credit is due
* but requiring it would be too onerous.
*
* This software is provided ``AS IS'' without any warranties of any kind.
*
* NEW command line interface for IP firewall facility
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <timeconv.h>
#include <unistd.h>
#include <sysexits.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_fw.h>
#include <net/route.h> /* def. of struct route */
#include <netinet/ip_dummynet.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
int s, /* main RAW socket */
do_resolv, /* Would try to resolve all */
do_acct, /* Show packet/byte count */
do_time, /* Show time stamps */
do_quiet, /* Be quiet in add and flush */
do_force, /* Don't ask for confirmation */
do_pipe, /* this cmd refers to a pipe */
do_sort, /* field to sort results (0 = no) */
do_dynamic, /* display dynamic rules */
do_expired, /* display expired dynamic rules */
do_compact, /* show rules in compact mode */
show_sets, /* display rule sets */
verbose;
#define IP_MASK_ALL 0xffffffff
/*
* structure to hold flag names and associated values to be
* set in the appropriate masks.
* A NULL string terminates the array.
* Often, an element with 0 value contains an error string.
*
*/
struct _s_x {
char *s;
int x;
};
static struct _s_x f_tcpflags[] = {
{ "syn", TH_SYN },
{ "fin", TH_FIN },
{ "ack", TH_ACK },
{ "psh", TH_PUSH },
{ "rst", TH_RST },
{ "urg", TH_URG },
{ "tcp flag", 0 },
{ NULL, 0 }
};
static struct _s_x f_tcpopts[] = {
{ "mss", IP_FW_TCPOPT_MSS },
{ "maxseg", IP_FW_TCPOPT_MSS },
{ "window", IP_FW_TCPOPT_WINDOW },
{ "sack", IP_FW_TCPOPT_SACK },
{ "ts", IP_FW_TCPOPT_TS },
{ "timestamp", IP_FW_TCPOPT_TS },
{ "cc", IP_FW_TCPOPT_CC },
{ "tcp option", 0 },
{ NULL, 0 }
};
/*
* IP options span the range 0 to 255 so we need to remap them
* (though in fact only the low 5 bits are significant).
*/
static struct _s_x f_ipopts[] = {
{ "ssrr", IP_FW_IPOPT_SSRR},
{ "lsrr", IP_FW_IPOPT_LSRR},
{ "rr", IP_FW_IPOPT_RR},
{ "ts", IP_FW_IPOPT_TS},
{ "ip option", 0 },
{ NULL, 0 }
};
static struct _s_x f_iptos[] = {
{ "lowdelay", IPTOS_LOWDELAY},
{ "throughput", IPTOS_THROUGHPUT},
{ "reliability", IPTOS_RELIABILITY},
{ "mincost", IPTOS_MINCOST},
{ "congestion", IPTOS_CE},
{ "ecntransport", IPTOS_ECT},
{ "ip tos option", 0},
{ NULL, 0 }
};
static struct _s_x limit_masks[] = {
{"all", DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
{"src-addr", DYN_SRC_ADDR},
{"src-port", DYN_SRC_PORT},
{"dst-addr", DYN_DST_ADDR},
{"dst-port", DYN_DST_PORT},
{NULL, 0}
};
/*
* we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
* This is only used in this code.
*/
#define IPPROTO_ETHERTYPE 0x1000
static struct _s_x ether_types[] = {
/*
* Note, we cannot use "-:&/" in the names because they are field
* separators in the type specifications. Also, we use s = NULL as
* end-delimiter, because a type of 0 can be legal.
*/
{ "ip", 0x0800 },
{ "ipv4", 0x0800 },
{ "ipv6", 0x86dd },
{ "arp", 0x0806 },
{ "rarp", 0x8035 },
{ "vlan", 0x8100 },
{ "loop", 0x9000 },
{ "trail", 0x1000 },
{ "at", 0x809b },
{ "atalk", 0x809b },
{ "aarp", 0x80f3 },
{ "pppoe_disc", 0x8863 },
{ "pppoe_sess", 0x8864 },
{ "ipx_8022", 0x00E0 },
{ "ipx_8023", 0x0000 },
{ "ipx_ii", 0x8137 },
{ "ipx_snap", 0x8137 },
{ "ipx", 0x8137 },
{ "ns", 0x0600 },
{ NULL, 0 }
};
static void show_usage(void);
enum tokens {
TOK_NULL=0,
TOK_OR,
TOK_NOT,
TOK_STARTBRACE,
TOK_ENDBRACE,
TOK_ACCEPT,
TOK_COUNT,
TOK_PIPE,
TOK_QUEUE,
TOK_DIVERT,
TOK_TEE,
TOK_FORWARD,
TOK_SKIPTO,
TOK_DENY,
TOK_REJECT,
TOK_RESET,
TOK_UNREACH,
TOK_CHECKSTATE,
TOK_UID,
TOK_GID,
TOK_IN,
TOK_LIMIT,
TOK_KEEPSTATE,
TOK_LAYER2,
TOK_OUT,
TOK_XMIT,
TOK_RECV,
TOK_VIA,
TOK_FRAG,
TOK_IPOPTS,
TOK_IPLEN,
TOK_IPID,
TOK_IPPRECEDENCE,
TOK_IPTOS,
TOK_IPTTL,
TOK_IPVER,
TOK_ESTAB,
TOK_SETUP,
TOK_TCPFLAGS,
TOK_TCPOPTS,
TOK_TCPSEQ,
TOK_TCPACK,
TOK_TCPWIN,
TOK_ICMPTYPES,
TOK_MAC,
TOK_MACTYPE,
TOK_VERREVPATH,
TOK_IPSEC,
TOK_PLR,
TOK_NOERROR,
TOK_BUCKETS,
TOK_DSTIP,
TOK_SRCIP,
TOK_DSTPORT,
TOK_SRCPORT,
TOK_ALL,
TOK_MASK,
TOK_BW,
TOK_DELAY,
TOK_RED,
TOK_GRED,
TOK_DROPTAIL,
TOK_PROTO,
TOK_WEIGHT,
};
struct _s_x dummynet_params[] = {
{ "plr", TOK_PLR },
{ "noerror", TOK_NOERROR },
{ "buckets", TOK_BUCKETS },
{ "dst-ip", TOK_DSTIP },
{ "src-ip", TOK_SRCIP },
{ "dst-port", TOK_DSTPORT },
{ "src-port", TOK_SRCPORT },
{ "proto", TOK_PROTO },
{ "weight", TOK_WEIGHT },
{ "all", TOK_ALL },
{ "mask", TOK_MASK },
{ "droptail", TOK_DROPTAIL },
{ "red", TOK_RED },
{ "gred", TOK_GRED },
{ "bw", TOK_BW },
{ "bandwidth", TOK_BW },
{ "delay", TOK_DELAY },
{ "pipe", TOK_PIPE },
{ "queue", TOK_QUEUE },
{ "dummynet-params", TOK_NULL },
{ NULL, 0 }
};
struct _s_x rule_actions[] = {
{ "accept", TOK_ACCEPT },
{ "pass", TOK_ACCEPT },
{ "allow", TOK_ACCEPT },
{ "permit", TOK_ACCEPT },
{ "count", TOK_COUNT },
{ "pipe", TOK_PIPE },
{ "queue", TOK_QUEUE },
{ "divert", TOK_DIVERT },
{ "tee", TOK_TEE },
{ "fwd", TOK_FORWARD },
{ "forward", TOK_FORWARD },
{ "skipto", TOK_SKIPTO },
{ "deny", TOK_DENY },
{ "drop", TOK_DENY },
{ "reject", TOK_REJECT },
{ "reset", TOK_RESET },
{ "unreach", TOK_UNREACH },
{ "check-state", TOK_CHECKSTATE },
{ NULL, TOK_NULL },
{ NULL, 0 }
};
struct _s_x rule_options[] = {
{ "uid", TOK_UID },
{ "gid", TOK_GID },
{ "in", TOK_IN },
{ "limit", TOK_LIMIT },
{ "keep-state", TOK_KEEPSTATE },
{ "bridged", TOK_LAYER2 },
{ "layer2", TOK_LAYER2 },
{ "out", TOK_OUT },
{ "xmit", TOK_XMIT },
{ "recv", TOK_RECV },
{ "via", TOK_VIA },
{ "fragment", TOK_FRAG },
{ "frag", TOK_FRAG },
{ "ipoptions", TOK_IPOPTS },
{ "ipopts", TOK_IPOPTS },
{ "iplen", TOK_IPLEN },
{ "ipid", TOK_IPID },
{ "ipprecedence", TOK_IPPRECEDENCE },
{ "iptos", TOK_IPTOS },
{ "ipttl", TOK_IPTTL },
{ "ipversion", TOK_IPVER },
{ "ipver", TOK_IPVER },
{ "estab", TOK_ESTAB },
{ "established", TOK_ESTAB },
{ "setup", TOK_SETUP },
{ "tcpflags", TOK_TCPFLAGS },
{ "tcpflgs", TOK_TCPFLAGS },
{ "tcpoptions", TOK_TCPOPTS },
{ "tcpopts", TOK_TCPOPTS },
{ "tcpseq", TOK_TCPSEQ },
{ "tcpack", TOK_TCPACK },
{ "tcpwin", TOK_TCPWIN },
{ "icmptype", TOK_ICMPTYPES },
{ "icmptypes", TOK_ICMPTYPES },
{ "dst-ip", TOK_DSTIP },
{ "src-ip", TOK_SRCIP },
{ "dst-port", TOK_DSTPORT },
{ "src-port", TOK_SRCPORT },
{ "proto", TOK_PROTO },
{ "MAC", TOK_MAC },
{ "mac", TOK_MAC },
{ "mac-type", TOK_MACTYPE },
{ "verrevpath", TOK_VERREVPATH },
{ "ipsec", TOK_IPSEC },
{ "not", TOK_NOT }, /* pseudo option */
{ "!", /* escape ? */ TOK_NOT }, /* pseudo option */
{ "or", TOK_OR }, /* pseudo option */
{ "|", /* escape */ TOK_OR }, /* pseudo option */
{ "{", TOK_STARTBRACE }, /* pseudo option */
{ "(", TOK_STARTBRACE }, /* pseudo option */
{ "}", TOK_ENDBRACE }, /* pseudo option */
{ ")", TOK_ENDBRACE }, /* pseudo option */
{ NULL, TOK_NULL },
{ NULL, 0 }
};
static __inline u_int64_t
align_uint64(u_int64_t *pll) {
u_int64_t ret;
bcopy (pll, &ret, sizeof(ret));
return ret;
};
/**
* match_token takes a table and a string, returns the value associated
* with the string (0 meaning an error in most cases)
*/
static int
match_token(struct _s_x *table, char *string)
{
struct _s_x *pt;
int i = strlen(string);
for (pt = table ; i && pt->s != NULL ; pt++)
if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
return pt->x;
return -1;
};
static char *
match_value(struct _s_x *p, u_int32_t value)
{
for (; p->s != NULL; p++)
if (p->x == value)
return p->s;
return NULL;
}
/*
* prints one port, symbolic or numeric
*/
static void
print_port(int proto, u_int16_t port)
{
if (proto == IPPROTO_ETHERTYPE) {
char *s;
if (do_resolv && (s = match_value(ether_types, port)) )
printf("%s", s);
else
printf("0x%04x", port);
} else {
struct servent *se = NULL;
if (do_resolv) {
struct protoent *pe = getprotobynumber(proto);
se = getservbyport(htons(port), pe ? pe->p_name : NULL);
}
if (se)
printf("%s", se->s_name);
else
printf("%d", port);
}
}
/*
* print the values in a list of ports
* XXX todo: add support for mask.
*/
static void
print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
{
u_int16_t *p = cmd->ports;
int i;
char *sep;
if (cmd->o.len & F_NOT)
printf(" not");
if (opcode != 0) {
switch (opcode) {
case O_IP_DSTPORT:
sep = "dst-port";
break;
case O_IP_SRCPORT:
sep = "src-port";
break;
case O_IPID:
sep = "ipid";
break;
case O_IPLEN:
sep = "iplen";
break;
case O_IPTTL:
sep = "ipttl";
break;
case O_MAC_TYPE:
sep = "mac-type";
break;
default:
sep = "???";
break;
}
printf (" %s", sep);
}
sep = " ";
for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
printf(sep);
print_port(proto, p[0]);
if (p[0] != p[1]) {
printf("-");
print_port(proto, p[1]);
}
sep = ",";
}
}
/*
* Like strtol, but also translates service names into port numbers
* for some protocols.
* In particular:
* proto == -1 disables the protocol check;
* proto == IPPROTO_ETHERTYPE looks up an internal table
* proto == <some value in /etc/protocols> matches the values there.
* Returns *end == s in case the parameter is not found.
*/
static int
strtoport(char *s, char **end, int base, int proto)
{
char *p, *buf;
char *s1;
int i;
*end = s; /* default - not found */
if ( *s == '\0')
return 0; /* not found */
if (isdigit(*s))
return strtol(s, end, base);
/*
* find separator. '\\' escapes the next char.
*/
for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
if (*s1 == '\\' && s1[1] != '\0')
s1++;
buf = malloc(s1 - s + 1);
if (buf == NULL)
return 0;
/*
* copy into a buffer skipping backslashes
*/
for (p = s, i = 0; p != s1 ; p++)
if ( *p != '\\')
buf[i++] = *p;
buf[i++] = '\0';
if (proto == IPPROTO_ETHERTYPE) {
i = match_token(ether_types, buf);
free(buf);
if (i != -1) { /* found */
*end = s1;
return i;
}
} else {
struct protoent *pe = NULL;
struct servent *se;
if (proto != 0)
pe = getprotobynumber(proto);
setservent(1);
se = getservbyname(buf, pe ? pe->p_name : NULL);
free(buf);
if (se != NULL) {
*end = s1;
return ntohs(se->s_port);
}
}
return 0; /* not found */
}
/*
* fill the body of the command with the list of port ranges.
* At the moment it only understands numeric ranges.
*/
static int
fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
{
u_int16_t *p = cmd->ports;
int i = 0;
char *s = av;
while (*s) {
u_int16_t a, b;
a = strtoport(av, &s, 0, proto);
if (s == av) /* no parameter */
break;
if (*s == '-') { /* a range */
av = s+1;
b = strtoport(av, &s, 0, proto);
if (s == av) /* no parameter */
break;
p[0] = a;
p[1] = b;
} else if (*s == ',' || *s == '\0' ) {
p[0] = p[1] = a;
} else { /* invalid separator */
errx(EX_DATAERR, "invalid separator <%c> in <%s>\n",
*s, av);
}
i++;
p += 2;
av = s+1;
}
if (i > 0) {
if (i+1 > F_LEN_MASK)
errx(EX_DATAERR, "too many ports/ranges\n");
cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */
}
return i;
}
static struct _s_x icmpcodes[] = {
{ "net", ICMP_UNREACH_NET },
{ "host", ICMP_UNREACH_HOST },
{ "protocol", ICMP_UNREACH_PROTOCOL },
{ "port", ICMP_UNREACH_PORT },
{ "needfrag", ICMP_UNREACH_NEEDFRAG },
{ "srcfail", ICMP_UNREACH_SRCFAIL },
{ "net-unknown", ICMP_UNREACH_NET_UNKNOWN },
{ "host-unknown", ICMP_UNREACH_HOST_UNKNOWN },
{ "isolated", ICMP_UNREACH_ISOLATED },
{ "net-prohib", ICMP_UNREACH_NET_PROHIB },
{ "host-prohib", ICMP_UNREACH_HOST_PROHIB },
{ "tosnet", ICMP_UNREACH_TOSNET },
{ "toshost", ICMP_UNREACH_TOSHOST },
{ "filter-prohib", ICMP_UNREACH_FILTER_PROHIB },
{ "host-precedence", ICMP_UNREACH_HOST_PRECEDENCE },
{ "precedence-cutoff", ICMP_UNREACH_PRECEDENCE_CUTOFF },
{ NULL, 0 }
};
static void
fill_reject_code(u_short *codep, char *str)
{
int val;
char *s;
val = strtoul(str, &s, 0);
if (s == str || *s != '\0' || val >= 0x100)
val = match_token(icmpcodes, str);
if (val < 0)
errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
*codep = val;
return;
}
static void
print_reject_code(u_int16_t code)
{
char *s = match_value(icmpcodes, code);
if (s != NULL)
printf("unreach %s", s);
else
printf("unreach %u", code);
}
/*
* Returns the number of bits set (from left) in a contiguous bitmask,
* or -1 if the mask is not contiguous.
* XXX this needs a proper fix.
* This effectively works on masks in big-endian (network) format.
* when compiled on little endian architectures.
*
* First bit is bit 7 of the first byte -- note, for MAC addresses,
* the first bit on the wire is bit 0 of the first byte.
* len is the max length in bits.
*/
static int
contigmask(u_char *p, int len)
{
int i, n;
for (i=0; i<len ; i++)
if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
break;
for (n=i+1; n < len; n++)
if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
return -1; /* mask not contiguous */
return i;
}
/*
* print flags set/clear in the two bitmasks passed as parameters.
* There is a specialized check for f_tcpflags.
*/
static void
print_flags(char *name, ipfw_insn *cmd, struct _s_x *list)
{
char *comma="";
int i;
u_char set = cmd->arg1 & 0xff;
u_char clear = (cmd->arg1 >> 8) & 0xff;
if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
printf(" setup");
return;
}
printf(" %s ", name);
for (i=0; list[i].x != 0; i++) {
if (set & list[i].x) {
set &= ~list[i].x;
printf("%s%s", comma, list[i].s);
comma = ",";
}
if (clear & list[i].x) {
clear &= ~list[i].x;
printf("%s!%s", comma, list[i].s);
comma = ",";
}
}
}
/*
* Print the ip address contained in a command.
*/
static void
print_ip(ipfw_insn_ip *cmd, char *s)
{
struct hostent *he = NULL;
int mb;
printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
printf("me");
return;
}
if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
u_int32_t x, *d;
int i, j;
char comma = '{';
x = cmd->o.arg1 - 1;
x = htonl( ~x );
cmd->addr.s_addr = htonl(cmd->addr.s_addr);
printf("%s/%d", inet_ntoa(cmd->addr),
contigmask((u_char *)&x, 32));
x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
x &= 0xff; /* base */
d = (u_int32_t *)&(cmd->mask);
/*
* Print bits and ranges.
* Locate first bit set (i), then locate first bit unset (j).
* If we have 3+ consecutive bits set, then print them as a
* range, otherwise only print the initial bit and rescan.
*/
for (i=0; i < cmd->o.arg1; i++)
if (d[i/32] & (1<<(i & 31))) {
for (j=i+1; j < cmd->o.arg1; j++)
if (!(d[ j/32] & (1<<(j & 31))))
break;
printf("%c%d", comma, i+x);
if (j>i+2) { /* range has at least 3 elements */
printf("-%d", j-1+x);
i = j-1;
}
comma = ',';
}
printf("}");
return;
}
if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST)
mb = 32;
else
mb = contigmask((u_char *)&(cmd->mask.s_addr), 32);
if (mb == 32 && do_resolv)
he = gethostbyaddr((char *)&(cmd->addr.s_addr),
sizeof(u_long), AF_INET);
if (he != NULL) /* resolved to name */
printf("%s", he->h_name);
else if (mb == 0) /* any */
printf("any");
else { /* numeric IP followed by some kind of mask */
printf("%s", inet_ntoa(cmd->addr));
if (mb < 0)
printf(":%s", inet_ntoa(cmd->mask));
else if (mb < 32)
printf("/%d", mb);
}
}
/*
* prints a MAC address/mask pair
*/
static void
print_mac(u_char *addr, u_char *mask)
{
int l = contigmask(mask, 48);
if (l == 0)
printf(" any");
else {
printf(" %02x:%02x:%02x:%02x:%02x:%02x",
addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
if (l == -1)
printf("&%02x:%02x:%02x:%02x:%02x:%02x",
mask[0], mask[1], mask[2],
mask[3], mask[4], mask[5]);
else if (l < 48)
printf("/%d", l);
}
}
static void
fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
{
u_int8_t type;
cmd->d[0] = 0;
while (*av) {
if (*av == ',')
av++;
type = strtoul(av, &av, 0);
if (*av != ',' && *av != '\0')
errx(EX_DATAERR, "invalid ICMP type");
if (type > 31)
errx(EX_DATAERR, "ICMP type out of range");
cmd->d[0] |= 1 << type;
}
cmd->o.opcode = O_ICMPTYPE;
cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
}
static void
print_icmptypes(ipfw_insn_u32 *cmd)
{
int i;
char sep= ' ';
printf(" icmptypes");
for (i = 0; i < 32; i++) {
if ( (cmd->d[0] & (1 << (i))) == 0)
continue;
printf("%c%d", sep, i);
sep = ',';
}
}
/*
* show_ipfw() prints the body of an ipfw rule.
* Because the standard rule has at least proto src_ip dst_ip, we use
* a helper function to produce these entries if not provided explicitly.
* The first argument is the list of fields we have, the second is
* the list of fields we want to be printed.
*
* Special cases if we have provided a MAC header:
* + if the rule does not contain IP addresses/ports, do not print them;
* + if the rule does not contain an IP proto, print "all" instead of "ip";
*
* Once we have 'have_options', IP header fields are printed as options.
*/
#define HAVE_PROTO 0x0001
#define HAVE_SRCIP 0x0002
#define HAVE_DSTIP 0x0004
#define HAVE_MAC 0x0008
#define HAVE_MACTYPE 0x0010
#define HAVE_OPTIONS 0x8000
#define HAVE_IP (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP)
static void
show_prerequisites(int *flags, int want, int cmd)
{
if ( (*flags & HAVE_IP) == HAVE_IP)
*flags |= HAVE_OPTIONS;
if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC &&
cmd != O_MAC_TYPE) {
/*
* mac-type was optimized out by the compiler,
* restore it
*/
printf(" any");
*flags |= HAVE_MACTYPE | HAVE_OPTIONS;
return;
}
if ( !(*flags & HAVE_OPTIONS)) {
if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO))
printf(" ip");
if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
printf(" from any");
if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
printf(" to any");
}
*flags |= want;
}
static void
show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
{
static int twidth = 0;
int l;
ipfw_insn *cmd;
int proto = 0; /* default */
int flags = 0; /* prerequisites */
ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
int or_block = 0; /* we are in an or block */
u_int32_t set_disable;
bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
if (set_disable & (1 << rule->set)) { /* disabled */
if (!show_sets)
return;
else
printf("# DISABLED ");
}
printf("%05u ", rule->rulenum);
if (do_acct)
printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt),
bcwidth, align_uint64(&rule->bcnt));
if (do_time) {
char timestr[30];
time_t t = (time_t)0;
if (twidth == 0) {
strcpy(timestr, ctime(&t));
*strchr(timestr, '\n') = '\0';
twidth = strlen(timestr);
}
if (rule->timestamp) {
t = _long_to_time(rule->timestamp);
strcpy(timestr, ctime(&t));
*strchr(timestr, '\n') = '\0';
printf("%s ", timestr);
} else {
printf("%*s", twidth, " ");
}
}
if (show_sets)
printf("set %d ", rule->set);
/*
* print the optional "match probability"
*/
if (rule->cmd_len > 0) {
cmd = rule->cmd ;
if (cmd->opcode == O_PROB) {
ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
double d = 1.0 * p->d[0];
d = (d / 0x7fffffff);
printf("prob %f ", d);
}
}
/*
* first print actions
*/
for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
switch(cmd->opcode) {
case O_CHECK_STATE:
printf("check-state");
flags = HAVE_IP; /* avoid printing anything else */
break;
case O_ACCEPT:
printf("allow");
break;
case O_COUNT:
printf("count");
break;
case O_DENY:
printf("deny");
break;
case O_REJECT:
if (cmd->arg1 == ICMP_REJECT_RST)
printf("reset");
else if (cmd->arg1 == ICMP_UNREACH_HOST)
printf("reject");
else
print_reject_code(cmd->arg1);
break;
case O_SKIPTO:
printf("skipto %u", cmd->arg1);
break;
case O_PIPE:
printf("pipe %u", cmd->arg1);
break;
case O_QUEUE:
printf("queue %u", cmd->arg1);
break;
case O_DIVERT:
printf("divert %u", cmd->arg1);
break;
case O_TEE:
printf("tee %u", cmd->arg1);
break;
case O_FORWARD_IP:
{
ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
printf("fwd %s", inet_ntoa(s->sa.sin_addr));
if (s->sa.sin_port)
printf(",%d", s->sa.sin_port);
}
break;
case O_LOG: /* O_LOG is printed last */
logptr = (ipfw_insn_log *)cmd;
break;
default:
printf("** unrecognized action %d len %d",
cmd->opcode, cmd->len);
}
}
if (logptr) {
if (logptr->max_log > 0)
printf(" log logamount %d", logptr->max_log);
else
printf(" log");
}
/*
* then print the body.
*/
if (rule->_pad & 1) { /* empty rules before options */
if (!do_compact)
printf(" ip from any to any");
flags |= HAVE_IP | HAVE_OPTIONS;
}
for (l = rule->act_ofs, cmd = rule->cmd ;
l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
/* useful alias */
ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
show_prerequisites(&flags, 0, cmd->opcode);
switch(cmd->opcode) {
case O_PROB:
break; /* done already */
case O_PROBE_STATE:
break; /* no need to print anything here */
case O_MACADDR2: {
ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
if ((cmd->len & F_OR) && !or_block)
printf(" {");
if (cmd->len & F_NOT)
printf(" not");
printf(" MAC");
flags |= HAVE_MAC;
print_mac( m->addr, m->mask);
print_mac( m->addr + 6, m->mask + 6);
}
break;
case O_MAC_TYPE:
if ((cmd->len & F_OR) && !or_block)
printf(" {");
print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE,
(flags & HAVE_OPTIONS) ? cmd->opcode : 0);
flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS;
break;
case O_IP_SRC:
case O_IP_SRC_MASK:
case O_IP_SRC_ME:
case O_IP_SRC_SET:
show_prerequisites(&flags, HAVE_PROTO, 0);
if (!(flags & HAVE_SRCIP))
printf(" from");
if ((cmd->len & F_OR) && !or_block)
printf(" {");
print_ip((ipfw_insn_ip *)cmd,
(flags & HAVE_OPTIONS) ? " src-ip" : "");
flags |= HAVE_SRCIP;
break;
case O_IP_DST:
case O_IP_DST_MASK:
case O_IP_DST_ME:
case O_IP_DST_SET:
show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
if (!(flags & HAVE_DSTIP))
printf(" to");
if ((cmd->len & F_OR) && !or_block)
printf(" {");
print_ip((ipfw_insn_ip *)cmd,
(flags & HAVE_OPTIONS) ? " dst-ip" : "");
flags |= HAVE_DSTIP;
break;
case O_IP_DSTPORT:
show_prerequisites(&flags, HAVE_IP, 0);
case O_IP_SRCPORT:
show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
if ((cmd->len & F_OR) && !or_block)
printf(" {");
print_newports((ipfw_insn_u16 *)cmd, proto,
(flags & HAVE_OPTIONS) ? cmd->opcode : 0);
break;
case O_PROTO: {
struct protoent *pe;
if ((cmd->len & F_OR) && !or_block)
printf(" {");
if (cmd->len & F_NOT)
printf(" not");
proto = cmd->arg1;
pe = getprotobynumber(cmd->arg1);
if (flags & HAVE_OPTIONS)
printf(" proto");
if (pe)
printf(" %s", pe->p_name);
else
printf(" %u", cmd->arg1);
}
flags |= HAVE_PROTO;
break;
default: /*options ... */
show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0);
if ((cmd->len & F_OR) && !or_block)
printf(" {");
if (cmd->len & F_NOT && cmd->opcode != O_IN)
printf(" not");
switch(cmd->opcode) {
case O_FRAG:
printf(" frag");
break;
case O_IN:
printf(cmd->len & F_NOT ? " out" : " in");
break;
case O_LAYER2:
printf(" layer2");
break;
case O_XMIT:
case O_RECV:
case O_VIA: {
char *s;
ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
if (cmd->opcode == O_XMIT)
s = "xmit";
else if (cmd->opcode == O_RECV)
s = "recv";
else if (cmd->opcode == O_VIA)
s = "via";
if (cmdif->name[0] == '\0')
printf(" %s %s", s,
inet_ntoa(cmdif->p.ip));
else if (cmdif->p.unit == -1)
printf(" %s %s*", s, cmdif->name);
else
printf(" %s %s%d", s, cmdif->name,
cmdif->p.unit);
}
break;
case O_IPID:
if (F_LEN(cmd) == 1)
printf(" ipid %u", cmd->arg1 );
else
print_newports((ipfw_insn_u16 *)cmd, 0,
O_IPID);
break;
case O_IPTTL:
if (F_LEN(cmd) == 1)
printf(" ipttl %u", cmd->arg1 );
else
print_newports((ipfw_insn_u16 *)cmd, 0,
O_IPTTL);
break;
case O_IPVER:
printf(" ipver %u", cmd->arg1 );
break;
case O_IPPRECEDENCE:
printf(" ipprecedence %u", (cmd->arg1) >> 5 );
break;
case O_IPLEN:
if (F_LEN(cmd) == 1)
printf(" iplen %u", cmd->arg1 );
else
print_newports((ipfw_insn_u16 *)cmd, 0,
O_IPLEN);
break;
case O_IPOPT:
print_flags("ipoptions", cmd, f_ipopts);
break;
case O_IPTOS:
print_flags("iptos", cmd, f_iptos);
break;
case O_ICMPTYPE:
print_icmptypes((ipfw_insn_u32 *)cmd);
break;
case O_ESTAB:
printf(" established");
break;
case O_TCPFLAGS:
print_flags("tcpflags", cmd, f_tcpflags);
break;
case O_TCPOPTS:
print_flags("tcpoptions", cmd, f_tcpopts);
break;
case O_TCPWIN:
printf(" tcpwin %d", ntohs(cmd->arg1));
break;
case O_TCPACK:
printf(" tcpack %d", ntohl(cmd32->d[0]));
break;
case O_TCPSEQ:
printf(" tcpseq %d", ntohl(cmd32->d[0]));
break;
case O_UID:
{
struct passwd *pwd = getpwuid(cmd32->d[0]);
if (pwd)
printf(" uid %s", pwd->pw_name);
else
printf(" uid %u", cmd32->d[0]);
}
break;
case O_GID:
{
struct group *grp = getgrgid(cmd32->d[0]);
if (grp)
printf(" gid %s", grp->gr_name);
else
printf(" gid %u", cmd32->d[0]);
}
break;
case O_VERREVPATH:
printf(" verrevpath");
break;
case O_IPSEC:
printf(" ipsec");
break;
case O_KEEP_STATE:
printf(" keep-state");
break;
case O_LIMIT:
{
struct _s_x *p = limit_masks;
ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
u_int8_t x = c->limit_mask;
char *comma = " ";
printf(" limit");
for ( ; p->x != 0 ; p++)
if ((x & p->x) == p->x) {
x &= ~p->x;
printf("%s%s", comma, p->s);
comma = ",";
}
printf(" %d", c->conn_limit);
}
break;
default:
printf(" [opcode %d len %d]",
cmd->opcode, cmd->len);
}
}
if (cmd->len & F_OR) {
printf(" or");
or_block = 1;
} else if (or_block) {
printf(" }");
or_block = 0;
}
}
show_prerequisites(&flags, HAVE_IP, 0);
printf("\n");
}
static void
show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
{
struct protoent *pe;
struct in_addr a;
uint16_t rulenum;
if (!do_expired) {
if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
return;
}
bcopy(&d->rule, &rulenum, sizeof(rulenum));
printf("%05d %*llu %*llu (%ds)", rulenum, pcwidth,
align_uint64(&d->pcnt), bcwidth,
align_uint64(&d->bcnt), d->expire);
switch (d->dyn_type) {
case O_LIMIT_PARENT:
printf(" PARENT %d", d->count);
break;
case O_LIMIT:
printf(" LIMIT");
break;
case O_KEEP_STATE: /* bidir, no mask */
printf(" STATE");
break;
}
if ((pe = getprotobynumber(d->id.proto)) != NULL)
printf(" %s", pe->p_name);
else
printf(" proto %u", d->id.proto);
a.s_addr = htonl(d->id.src_ip);
printf(" %s %d", inet_ntoa(a), d->id.src_port);
a.s_addr = htonl(d->id.dst_ip);
printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
printf("\n");
}
int
sort_q(const void *pa, const void *pb)
{
int rev = (do_sort < 0);
int field = rev ? -do_sort : do_sort;
long long res = 0;
const struct dn_flow_queue *a = pa;
const struct dn_flow_queue *b = pb;
switch (field) {
case 1: /* pkts */
res = a->len - b->len;
break;
case 2: /* bytes */
res = a->len_bytes - b->len_bytes;
break;
case 3: /* tot pkts */
res = a->tot_pkts - b->tot_pkts;
break;
case 4: /* tot bytes */
res = a->tot_bytes - b->tot_bytes;
break;
}
if (res < 0)
res = -1;
if (res > 0)
res = 1;
return (int)(rev ? res : -res);
}
static void
list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q)
{
int l;
printf(" mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
fs->flow_mask.proto,
fs->flow_mask.src_ip, fs->flow_mask.src_port,
fs->flow_mask.dst_ip, fs->flow_mask.dst_port);
if (fs->rq_elements == 0)
return;
printf("BKT Prot ___Source IP/port____ "
"____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
if (do_sort != 0)
heapsort(q, fs->rq_elements, sizeof *q, sort_q);
for (l = 0; l < fs->rq_elements; l++) {
struct in_addr ina;
struct protoent *pe;
ina.s_addr = htonl(q[l].id.src_ip);
printf("%3d ", q[l].hash_slot);
pe = getprotobynumber(q[l].id.proto);
if (pe)
printf("%-4s ", pe->p_name);
else
printf("%4u ", q[l].id.proto);
printf("%15s/%-5d ",
inet_ntoa(ina), q[l].id.src_port);
ina.s_addr = htonl(q[l].id.dst_ip);
printf("%15s/%-5d ",
inet_ntoa(ina), q[l].id.dst_port);
printf("%4qu %8qu %2u %4u %3u\n",
q[l].tot_pkts, q[l].tot_bytes,
q[l].len, q[l].len_bytes, q[l].drops);
if (verbose)
printf(" S %20qd F %20qd\n",
q[l].S, q[l].F);
}
}
static void
print_flowset_parms(struct dn_flow_set *fs, char *prefix)
{
int l;
char qs[30];
char plr[30];
char red[90]; /* Display RED parameters */
l = fs->qsize;
if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
if (l >= 8192)
sprintf(qs, "%d KB", l / 1024);
else
sprintf(qs, "%d B", l);
} else
sprintf(qs, "%3d sl.", l);
if (fs->plr)
sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
else
plr[0] = '\0';
if (fs->flags_fs & DN_IS_RED) /* RED parameters */
sprintf(red,
"\n\t %cRED w_q %f min_th %d max_th %d max_p %f",
(fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1.0 * fs->w_q / (double)(1 << SCALE_RED),
SCALE_VAL(fs->min_th),
SCALE_VAL(fs->max_th),
1.0 * fs->max_p / (double)(1 << SCALE_RED));
else
sprintf(red, "droptail");
printf("%s %s%s %d queues (%d buckets) %s\n",
prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
}
static void
list_pipes(void *data, int nbytes, int ac, char *av[])
{
u_long rulenum;
void *next = data;
struct dn_pipe *p = (struct dn_pipe *) data;
struct dn_flow_set *fs;
struct dn_flow_queue *q;
int l;
if (ac > 0)
rulenum = strtoul(*av++, NULL, 10);
else
rulenum = 0;
for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) {
double b = p->bandwidth;
char buf[30];
char prefix[80];
if (p->next != (struct dn_pipe *)DN_IS_PIPE)
break; /* done with pipes, now queues */
/*
* compute length, as pipe have variable size
*/
l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
next = (void *)p + l;
nbytes -= l;
if (rulenum != 0 && rulenum != p->pipe_nr)
continue;
/*
* Print rate (or clocking interface)
*/
if (p->if_name[0] != '\0')
sprintf(buf, "%s", p->if_name);
else if (b == 0)
sprintf(buf, "unlimited");
else if (b >= 1000000)
sprintf(buf, "%7.3f Mbit/s", b/1000000);
else if (b >= 1000)
sprintf(buf, "%7.3f Kbit/s", b/1000);
else
sprintf(buf, "%7.3f bit/s ", b);
sprintf(prefix, "%05d: %s %4d ms ",
p->pipe_nr, buf, p->delay);
print_flowset_parms(&(p->fs), prefix);
if (verbose)
printf(" V %20qd\n", p->V >> MY_M);
q = (struct dn_flow_queue *)(p+1);
list_queues(&(p->fs), q);
}
for (fs = next; nbytes >= sizeof *fs; fs = next) {
char prefix[80];
if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE)
break;
l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
next = (void *)fs + l;
nbytes -= l;
q = (struct dn_flow_queue *)(fs+1);
sprintf(prefix, "q%05d: weight %d pipe %d ",
fs->fs_nr, fs->weight, fs->parent_nr);
print_flowset_parms(fs, prefix);
list_queues(fs, q);
}
}
/*
* This one handles all set-related commands
* ipfw set { show | enable | disable }
* ipfw set swap X Y
* ipfw set move X to Y
* ipfw set move rule X to Y
*/
static void
sets_handler(int ac, char *av[])
{
u_int32_t set_disable, masks[2];
int i, nbytes;
u_int16_t rulenum;
u_int8_t cmd, new_set;
ac--;
av++;
if (!ac)
errx(EX_USAGE, "set needs command");
if (!strncmp(*av, "show", strlen(*av)) ) {
void *data;
char *msg;
nbytes = sizeof(struct ip_fw);
if ((data = malloc(nbytes)) == NULL)
err(EX_OSERR, "malloc");
if (getsockopt(s, IPPROTO_IP, IP_FW_GET, data, &nbytes) < 0)
err(EX_OSERR, "getsockopt(IP_FW_GET)");
bcopy(&((struct ip_fw *)data)->next_rule,
&set_disable, sizeof(set_disable));
for (i = 0, msg = "disable" ; i < 31; i++)
if ( (set_disable & (1<<i))) {
printf("%s %d", msg, i);
msg = "";
}
msg = (set_disable) ? " enable" : "enable";
for (i = 0; i < 31; i++)
if ( !(set_disable & (1<<i))) {
printf("%s %d", msg, i);
msg = "";
}
printf("\n");
} else if (!strncmp(*av, "swap", strlen(*av))) {
ac--; av++;
if (ac != 2)
errx(EX_USAGE, "set swap needs 2 set numbers\n");
rulenum = atoi(av[0]);
new_set = atoi(av[1]);
if (!isdigit(*(av[0])) || rulenum > 30)
errx(EX_DATAERR, "invalid set number %s\n", av[0]);
if (!isdigit(*(av[1])) || new_set > 30)
errx(EX_DATAERR, "invalid set number %s\n", av[1]);
masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
masks, sizeof(u_int32_t));
} else if (!strncmp(*av, "move", strlen(*av))) {
ac--; av++;
if (ac && !strncmp(*av, "rule", strlen(*av))) {
cmd = 2;
ac--; av++;
} else
cmd = 3;
if (ac != 3 || strncmp(av[1], "to", strlen(*av)))
errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
rulenum = atoi(av[0]);
new_set = atoi(av[2]);
if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) ||
(cmd == 2 && rulenum == 65535) )
errx(EX_DATAERR, "invalid source number %s\n", av[0]);
if (!isdigit(*(av[2])) || new_set > 30)
errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
masks, sizeof(u_int32_t));
} else if (!strncmp(*av, "disable", strlen(*av)) ||
!strncmp(*av, "enable", strlen(*av)) ) {
int which = !strncmp(*av, "enable", strlen(*av)) ? 1 : 0;
ac--; av++;
masks[0] = masks[1] = 0;
while (ac) {
if (isdigit(**av)) {
i = atoi(*av);
if (i < 0 || i > 30)
errx(EX_DATAERR,
"invalid set number %d\n", i);
masks[which] |= (1<<i);
} else if (!strncmp(*av, "disable", strlen(*av)))
which = 0;
else if (!strncmp(*av, "enable", strlen(*av)))
which = 1;
else
errx(EX_DATAERR,
"invalid set command %s\n", *av);
av++; ac--;
}
if ( (masks[0] & masks[1]) != 0 )
errx(EX_DATAERR,
"cannot enable and disable the same set\n");
i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, masks, sizeof(masks));
if (i)
warn("set enable/disable: setsockopt(IP_FW_DEL)");
} else
errx(EX_USAGE, "invalid set command %s\n", *av);
}
static void
sysctl_handler(int ac, char *av[], int which)
{
ac--;
av++;
if (*av == NULL) {
warnx("missing keyword to enable/disable\n");
} else if (strncmp(*av, "firewall", strlen(*av)) == 0) {
sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
&which, sizeof(which));
} else if (strncmp(*av, "one_pass", strlen(*av)) == 0) {
sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
&which, sizeof(which));
} else if (strncmp(*av, "debug", strlen(*av)) == 0) {
sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
&which, sizeof(which));
} else if (strncmp(*av, "verbose", strlen(*av)) == 0) {
sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
&which, sizeof(which));
} else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) {
sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
&which, sizeof(which));
} else {
warnx("unrecognize enable/disable keyword: %s\n", *av);
}
}
static void
list(int ac, char *av[])
{
struct ip_fw *r;
ipfw_dyn_rule *dynrules, *d;
void *lim, *data = NULL;
int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
int exitval = EX_OK;
int lac;
char **lav;
u_long rnum;
char *endptr;
int seen = 0;
const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
int nalloc = 1024; /* start somewhere... */
ac--;
av++;
/* get rules or pipes from kernel, resizing array as necessary */
nbytes = nalloc;
while (nbytes >= nalloc) {
nalloc = nalloc * 2 + 200;
nbytes = nalloc;
if ((data = realloc(data, nbytes)) == NULL)
err(EX_OSERR, "realloc");
if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
err(EX_OSERR, "getsockopt(IP_%s_GET)",
do_pipe ? "DUMMYNET" : "FW");
}
if (do_pipe) {
list_pipes(data, nbytes, ac, av);
goto done;
}
/*
* Count static rules. They have variable size so we
* need to scan the list to count them.
*/
for (nstat = 1, r = data, lim = data + nbytes;
r->rulenum < 65535 && (void *)r < lim;
++nstat, r = (void *)r + RULESIZE(r) )
; /* nothing */
/*
* Count dynamic rules. This is easier as they have
* fixed size.
*/
r = (void *)r + RULESIZE(r);
dynrules = (ipfw_dyn_rule *)r ;
n = (void *)r - data;
ndyn = (nbytes - n) / sizeof *dynrules;
/* if showing stats, figure out column widths ahead of time */
bcwidth = pcwidth = 0;
if (do_acct) {
for (n = 0, r = data; n < nstat;
n++, r = (void *)r + RULESIZE(r)) {
/* packet counter */
width = snprintf(NULL, 0, "%llu",
align_uint64(&r->pcnt));
if (width > pcwidth)
pcwidth = width;
/* byte counter */
width = snprintf(NULL, 0, "%llu",
align_uint64(&r->bcnt));
if (width > bcwidth)
bcwidth = width;
}
}
if (do_dynamic && ndyn) {
for (n = 0, d = dynrules; n < ndyn; n++, d++) {
width = snprintf(NULL, 0, "%llu",
align_uint64(&d->pcnt));
if (width > pcwidth)
pcwidth = width;
width = snprintf(NULL, 0, "%llu",
align_uint64(&d->bcnt));
if (width > bcwidth)
bcwidth = width;
}
}
/* if no rule numbers were specified, list all rules */
if (ac == 0) {
for (n = 0, r = data; n < nstat;
n++, r = (void *)r + RULESIZE(r) )
show_ipfw(r, pcwidth, bcwidth);
if (do_dynamic && ndyn) {
printf("## Dynamic rules (%d):\n", ndyn);
for (n = 0, d = dynrules; n < ndyn; n++, d++)
show_dyn_ipfw(d, pcwidth, bcwidth);
}
goto done;
}
/* display specific rules requested on command line */
for (lac = ac, lav = av; lac != 0; lac--) {
/* convert command line rule # */
rnum = strtoul(*lav++, &endptr, 10);
if (*endptr) {
exitval = EX_USAGE;
warnx("invalid rule number: %s", *(lav - 1));
continue;
}
for (n = seen = 0, r = data; n < nstat;
n++, r = (void *)r + RULESIZE(r) ) {
if (r->rulenum > rnum)
break;
if (r->rulenum == rnum) {
show_ipfw(r, pcwidth, bcwidth);
seen = 1;
}
}
if (!seen) {
/* give precedence to other error(s) */
if (exitval == EX_OK)
exitval = EX_UNAVAILABLE;
warnx("rule %lu does not exist", rnum);
}
}
if (do_dynamic && ndyn) {
printf("## Dynamic rules:\n");
for (lac = ac, lav = av; lac != 0; lac--) {
rnum = strtoul(*lav++, &endptr, 10);
if (*endptr)
/* already warned */
continue;
for (n = 0, d = dynrules; n < ndyn; n++, d++) {
uint16_t rulenum;
bcopy(&d->rule, &rulenum, sizeof(rulenum));
if (rulenum > rnum)
break;
if (rulenum == rnum)
show_dyn_ipfw(d, pcwidth, bcwidth);
}
}
}
ac = 0;
done:
free(data);
if (exitval != EX_OK)
exit(exitval);
}
static void
show_usage(void)
{
fprintf(stderr, "usage: ipfw [options]\n"
" add [number] rule\n"
" pipe number config [pipeconfig]\n"
" queue number config [queueconfig]\n"
" [pipe] flush\n"
" [pipe] delete number ...\n"
" [pipe] {list|show} [number ...]\n"
" {zero|resetlog} [number ...]\n"
"do \"ipfw -h\" or see ipfw manpage for details\n"
);
exit(EX_USAGE);
}
static void
help(void)
{
fprintf(stderr, "ipfw syntax summary:\n"
"ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
"ipfw {pipe|queue} N config BODY\n"
"ipfw [pipe] {zero|delete|show} [N{,N}]\n"
"\n"
"RULE: [1..] [PROB] BODY\n"
"RULENUM: INTEGER(1..65534)\n"
"PROB: prob REAL(0..1)\n"
"BODY: check-state [LOG] (no body) |\n"
" ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
"ACTION: check-state | allow | count | deny | reject | skipto N |\n"
" {divert|tee} PORT | forward ADDR | pipe N | queue N\n"
"ADDR: [ MAC dst src ether_type ] \n"
" [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
"IPLIST: IPADDR | ( IPADDR or ... or IPADDR )\n"
"IPADDR: [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
"OPTION_LIST: OPTION [,OPTION_LIST]\n"
);
exit(0);
}
static int
lookup_host (char *host, struct in_addr *ipaddr)
{
struct hostent *he;
if (!inet_aton(host, ipaddr)) {
if ((he = gethostbyname(host)) == NULL)
return(-1);
*ipaddr = *(struct in_addr *)he->h_addr_list[0];
}
return(0);
}
/*
* fills the addr and mask fields in the instruction as appropriate from av.
* Update length as appropriate.
* The following formats are allowed:
* any matches any IP. Actually returns an empty instruction.
* me returns O_IP_*_ME
* 1.2.3.4 single IP address
* 1.2.3.4:5.6.7.8 address:mask
* 1.2.3.4/24 address/mask
* 1.2.3.4/26{1,6,5,4,23} set of addresses in a subnet
*/
static void
fill_ip(ipfw_insn_ip *cmd, char *av)
{
char *p = 0, md = 0;
u_int32_t i;
cmd->o.len &= ~F_LEN_MASK; /* zero len */
if (!strncmp(av, "any", strlen(av)))
return;
if (!strncmp(av, "me", strlen(av))) {
cmd->o.len |= F_INSN_SIZE(ipfw_insn);
return;
}
p = strchr(av, '/');
if (!p)
p = strchr(av, ':');
if (p) {
md = *p;
*p++ = '\0';
}
if (lookup_host(av, &cmd->addr) != 0)
errx(EX_NOHOST, "hostname ``%s'' unknown", av);
switch (md) {
case ':':
if (!inet_aton(p, &cmd->mask))
errx(EX_DATAERR, "bad netmask ``%s''", p);
break;
case '/':
i = atoi(p);
if (i == 0)
cmd->mask.s_addr = htonl(0);
else if (i > 32)
errx(EX_DATAERR, "bad width ``%s''", p);
else
cmd->mask.s_addr = htonl(~0 << (32 - i));
break;
default:
cmd->mask.s_addr = htonl(~0);
break;
}
cmd->addr.s_addr &= cmd->mask.s_addr;
/*
* now look if we have a set of addresses. They are stored as follows:
* arg1 is the set size (powers of 2, 2..256)
* addr is the base address IN HOST FORMAT
* mask.. is an array of u_int32_t with bits set.
*/
if (p)
p = strchr(p, '{');
if (p) { /* fetch addresses */
u_int32_t *d;
int low, high;
int i = contigmask((u_char *)&(cmd->mask), 32);
if (i < 24 || i > 31) {
fprintf(stderr, "invalid set with mask %d\n",
i);
exit(0);
}
cmd->o.arg1 = 1<<(32-i);
cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
d = (u_int32_t *)&cmd->mask;
cmd->o.opcode = O_IP_DST_SET; /* default */
cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
d[i] = 0; /* clear masks */
av = p+1;
low = cmd->addr.s_addr & 0xff;
high = low + cmd->o.arg1 - 1;
i = -1; /* previous value in a range */
while (isdigit(*av)) {
char *s;
u_int16_t a = strtol(av, &s, 0);
if (s == av) /* no parameter */
break;
if (a < low || a > high) {
fprintf(stderr, "addr %d out of range [%d-%d]\n",
a, low, high);
exit(0);
}
a -= low;
if (i == -1) /* no previous in range */
i = a;
else { /* check that range is valid */
if (i > a)
errx(EX_DATAERR, "invalid range %d-%d",
i+low, a+low);
if (*s == '-')
errx(EX_DATAERR, "double '-' in range");
}
for (; i <= a; i++)
d[i/32] |= 1<<(i & 31);
i = -1;
if (*s == '-')
i = a;
else if (*s != ',')
break;
av = s+1;
}
return;
}
if (cmd->mask.s_addr == 0) { /* any */
if (cmd->o.len & F_NOT)
errx(EX_DATAERR, "not any never matches");
else /* useless, nuke it */
return;
} else if (cmd->mask.s_addr == IP_MASK_ALL) /* one IP */
cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
else /* addr/mask */
cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
}
/*
* helper function to process a set of flags and set bits in the
* appropriate masks.
*/
static void
fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
struct _s_x *flags, char *p)
{
u_int8_t set=0, clear=0;
while (p && *p) {
char *q; /* points to the separator */
int val;
u_int8_t *which; /* mask we are working on */
if (*p == '!') {
p++;
which = &clear;
} else
which = &set;
q = strchr(p, ',');
if (q)
*q++ = '\0';
val = match_token(flags, p);
if (val <= 0)
errx(EX_DATAERR, "invalid flag %s", p);
*which |= (u_int8_t)val;
p = q;
}
cmd->opcode = opcode;
cmd->len = (cmd->len & (F_NOT | F_OR)) | 1;
cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
}
static void
delete(int ac, char *av[])
{
u_int32_t rulenum;
struct dn_pipe pipe;
int i;
int exitval = EX_OK;
int do_set = 0;
memset(&pipe, 0, sizeof pipe);
av++; ac--;
if (ac > 0 && !strncmp(*av, "set", strlen(*av))) {
do_set = 1; /* delete set */
ac--; av++;
}
/* Rule number */
while (ac && isdigit(**av)) {
i = atoi(*av); av++; ac--;
if (do_pipe) {
if (do_pipe == 1)
pipe.pipe_nr = i;
else
pipe.fs.fs_nr = i;
i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
&pipe, sizeof pipe);
if (i) {
exitval = 1;
warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
do_pipe == 1 ? pipe.pipe_nr :
pipe.fs.fs_nr);
}
} else {
rulenum = (i & 0xffff) | (do_set << 24);
i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
sizeof rulenum);
if (i) {
exitval = EX_UNAVAILABLE;
warn("rule %u: setsockopt(IP_FW_DEL)",
rulenum);
}
}
}
if (exitval != EX_OK)
exit(exitval);
}
/*
* fill the interface structure. We do not check the name as we can
* create interfaces dynamically, so checking them at insert time
* makes relatively little sense.
* A '*' following the name means any unit.
*/
static void
fill_iface(ipfw_insn_if *cmd, char *arg)
{
cmd->name[0] = '\0';
cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
/* Parse the interface or address */
if (!strcmp(arg, "any"))
cmd->o.len = 0; /* effectively ignore this command */
else if (!isdigit(*arg)) {
char *q;
strncpy(cmd->name, arg, sizeof(cmd->name));
cmd->name[sizeof(cmd->name) - 1] = '\0';
/* find first digit or wildcard */
for (q = cmd->name; *q && !isdigit(*q) && *q != '*'; q++)
continue;
cmd->p.unit = (*q == '*') ? -1 : atoi(q);
*q = '\0';
} else if (!inet_aton(arg, &cmd->p.ip))
errx(EX_DATAERR, "bad ip address ``%s''", arg);
}
/*
* the following macro returns an error message if we run out of
* arguments.
*/
#define NEED1(msg) {if (!ac) errx(EX_USAGE, msg);}
static void
config_pipe(int ac, char **av)
{
struct dn_pipe pipe;
int i;
char *end;
u_int32_t a;
void *par = NULL;
memset(&pipe, 0, sizeof pipe);
av++; ac--;
/* Pipe number */
if (ac && isdigit(**av)) {
i = atoi(*av); av++; ac--;
if (do_pipe == 1)
pipe.pipe_nr = i;
else
pipe.fs.fs_nr = i;
}
while (ac > 0) {
double d;
int tok = match_token(dummynet_params, *av);
ac--; av++;
switch(tok) {
case TOK_NOERROR:
pipe.fs.flags_fs |= DN_NOERROR;
break;
case TOK_PLR:
NEED1("plr needs argument 0..1\n");
d = strtod(av[0], NULL);
if (d > 1)
d = 1;
else if (d < 0)
d = 0;
pipe.fs.plr = (int)(d*0x7fffffff);
ac--; av++;
break;
case TOK_QUEUE:
NEED1("queue needs queue size\n");
end = NULL;
pipe.fs.qsize = strtoul(av[0], &end, 0);
if (*end == 'K' || *end == 'k') {
pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
pipe.fs.qsize *= 1024;
} else if (*end == 'B' || !strncmp(end, "by", 2)) {
pipe.fs.flags_fs |= DN_QSIZE_IS_BYTES;
}
ac--; av++;
break;
case TOK_BUCKETS:
NEED1("buckets needs argument\n");
pipe.fs.rq_size = strtoul(av[0], NULL, 0);
ac--; av++;
break;
case TOK_MASK:
NEED1("mask needs mask specifier\n");
/*
* per-flow queue, mask is dst_ip, dst_port,
* src_ip, src_port, proto measured in bits
*/
par = NULL;
pipe.fs.flow_mask.dst_ip = 0;
pipe.fs.flow_mask.src_ip = 0;
pipe.fs.flow_mask.dst_port = 0;
pipe.fs.flow_mask.src_port = 0;
pipe.fs.flow_mask.proto = 0;
end = NULL;
while (ac >= 1) {
u_int32_t *p32 = NULL;
u_int16_t *p16 = NULL;
tok = match_token(dummynet_params, *av);
ac--; av++;
switch(tok) {
case TOK_ALL:
/*
* special case, all bits significant
*/
pipe.fs.flow_mask.dst_ip = ~0;
pipe.fs.flow_mask.src_ip = ~0;
pipe.fs.flow_mask.dst_port = ~0;
pipe.fs.flow_mask.src_port = ~0;
pipe.fs.flow_mask.proto = ~0;
pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
goto end_mask;
case TOK_DSTIP:
p32 = &pipe.fs.flow_mask.dst_ip;
break;
case TOK_SRCIP:
p32 = &pipe.fs.flow_mask.src_ip;
break;
case TOK_DSTPORT:
p16 = &pipe.fs.flow_mask.dst_port;
break;
case TOK_SRCPORT:
p16 = &pipe.fs.flow_mask.src_port;
break;
case TOK_PROTO:
break;
default:
ac++; av--; /* backtrack */
goto end_mask;
}
if (ac < 1)
errx(EX_USAGE, "mask: value missing");
if (*av[0] == '/') {
a = strtoul(av[0]+1, &end, 0);
a = (a == 32) ? ~0 : (1 << a) - 1;
} else
a = strtoul(av[0], &end, 0);
if (p32 != NULL)
*p32 = a;
else if (p16 != NULL) {
if (a > 65535)
errx(EX_DATAERR,
"mask: must be 16 bit");
*p16 = (u_int16_t)a;
} else {
if (a > 255)
errx(EX_DATAERR,
"mask: must be 8 bit");
pipe.fs.flow_mask.proto = (u_int8_t)a;
}
if (a != 0)
pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
ac--; av++;
} /* end while, config masks */
end_mask:
break;
case TOK_RED:
case TOK_GRED:
NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
pipe.fs.flags_fs |= DN_IS_RED;
if (tok == TOK_GRED)
pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
/*
* the format for parameters is w_q/min_th/max_th/max_p
*/
if ((end = strsep(&av[0], "/"))) {
double w_q = strtod(end, NULL);
if (w_q > 1 || w_q <= 0)
errx(EX_DATAERR, "0 < w_q <= 1");
pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
}
if ((end = strsep(&av[0], "/"))) {
pipe.fs.min_th = strtoul(end, &end, 0);
if (*end == 'K' || *end == 'k')
pipe.fs.min_th *= 1024;
}
if ((end = strsep(&av[0], "/"))) {
pipe.fs.max_th = strtoul(end, &end, 0);
if (*end == 'K' || *end == 'k')
pipe.fs.max_th *= 1024;
}
if ((end = strsep(&av[0], "/"))) {
double max_p = strtod(end, NULL);
if (max_p > 1 || max_p <= 0)
errx(EX_DATAERR, "0 < max_p <= 1");
pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
}
ac--; av++;
break;
case TOK_DROPTAIL:
pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
break;
case TOK_BW:
NEED1("bw needs bandwidth or interface\n");
if (do_pipe != 1)
errx(EX_DATAERR, "bandwidth only valid for pipes");
/*
* set clocking interface or bandwidth value
*/
if (av[0][0] >= 'a' && av[0][0] <= 'z') {
int l = sizeof(pipe.if_name)-1;
/* interface name */
strncpy(pipe.if_name, av[0], l);
pipe.if_name[l] = '\0';
pipe.bandwidth = 0;
} else {
pipe.if_name[0] = '\0';
pipe.bandwidth = strtoul(av[0], &end, 0);
if (*end == 'K' || *end == 'k') {
end++;
pipe.bandwidth *= 1000;
} else if (*end == 'M') {
end++;
pipe.bandwidth *= 1000000;
}
if (*end == 'B' || !strncmp(end, "by", 2))
pipe.bandwidth *= 8;
if (pipe.bandwidth < 0)
errx(EX_DATAERR, "bandwidth too large");
}
ac--; av++;
break;
case TOK_DELAY:
if (do_pipe != 1)
errx(EX_DATAERR, "delay only valid for pipes");
NEED1("delay needs argument 0..10000ms\n");
pipe.delay = strtoul(av[0], NULL, 0);
ac--; av++;
break;
case TOK_WEIGHT:
if (do_pipe == 1)
errx(EX_DATAERR,"weight only valid for queues");
NEED1("weight needs argument 0..100\n");
pipe.fs.weight = strtoul(av[0], &end, 0);
ac--; av++;
break;
case TOK_PIPE:
if (do_pipe == 1)
errx(EX_DATAERR,"pipe only valid for queues");
NEED1("pipe needs pipe_number\n");
pipe.fs.parent_nr = strtoul(av[0], &end, 0);
ac--; av++;
break;
default:
errx(EX_DATAERR, "unrecognised option ``%s''", *av);
}
}
if (do_pipe == 1) {
if (pipe.pipe_nr == 0)
errx(EX_DATAERR, "pipe_nr must be > 0");
if (pipe.delay > 10000)
errx(EX_DATAERR, "delay must be < 10000");
} else { /* do_pipe == 2, queue */
if (pipe.fs.parent_nr == 0)
errx(EX_DATAERR, "pipe must be > 0");
if (pipe.fs.weight >100)
errx(EX_DATAERR, "weight must be <= 100");
}
if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
if (pipe.fs.qsize > 1024*1024)
errx(EX_DATAERR, "queue size must be < 1MB");
} else {
if (pipe.fs.qsize > 100)
errx(EX_DATAERR, "2 <= queue size <= 100");
}
if (pipe.fs.flags_fs & DN_IS_RED) {
size_t len;
int lookup_depth, avg_pkt_size;
double s, idle, weight, w_q;
struct clockinfo clock;
int t;
if (pipe.fs.min_th >= pipe.fs.max_th)
errx(EX_DATAERR, "min_th %d must be < than max_th %d",
pipe.fs.min_th, pipe.fs.max_th);
if (pipe.fs.max_th == 0)
errx(EX_DATAERR, "max_th must be > 0");
len = sizeof(int);
if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
&lookup_depth, &len, NULL, 0) == -1)
errx(1, "sysctlbyname(\"%s\")",
"net.inet.ip.dummynet.red_lookup_depth");
if (lookup_depth == 0)
errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
" must be greater than zero");
len = sizeof(int);
if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
&avg_pkt_size, &len, NULL, 0) == -1)
errx(1, "sysctlbyname(\"%s\")",
"net.inet.ip.dummynet.red_avg_pkt_size");
if (avg_pkt_size == 0)
errx(EX_DATAERR,
"net.inet.ip.dummynet.red_avg_pkt_size must"
" be greater than zero");
len = sizeof(struct clockinfo);
if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1)
errx(1, "sysctlbyname(\"%s\")", "kern.clockrate");
/*
* Ticks needed for sending a medium-sized packet.
* Unfortunately, when we are configuring a WF2Q+ queue, we
* do not have bandwidth information, because that is stored
* in the parent pipe, and also we have multiple queues
* competing for it. So we set s=0, which is not very
* correct. But on the other hand, why do we want RED with
* WF2Q+ ?
*/
if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
s = 0;
else
s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth;
/*
* max idle time (in ticks) before avg queue size becomes 0.
* NOTA: (3/w_q) is approx the value x so that
* (1-w_q)^x < 10^-3.
*/
w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
idle = s * 3. / w_q;
pipe.fs.lookup_step = (int)idle / lookup_depth;
if (!pipe.fs.lookup_step)
pipe.fs.lookup_step = 1;
weight = 1 - w_q;
for (t = pipe.fs.lookup_step; t > 0; --t)
weight *= weight;
pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
}
i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
sizeof pipe);
if (i)
err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
}
static void
get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
{
int i, l;
for (i=0; i<6; i++)
addr[i] = mask[i] = 0;
if (!strcmp(p, "any"))
return;
for (i=0; *p && i<6;i++, p++) {
addr[i] = strtol(p, &p, 16);
if (*p != ':') /* we start with the mask */
break;
}
if (*p == '/') { /* mask len */
l = strtol(p+1, &p, 0);
for (i=0; l>0; l -=8, i++)
mask[i] = (l >=8) ? 0xff : (~0) << (8-l);
} else if (*p == '&') { /* mask */
for (i=0, p++; *p && i<6;i++, p++) {
mask[i] = strtol(p, &p, 16);
if (*p != ':')
break;
}
} else if (*p == '\0') {
for (i=0; i<6; i++)
mask[i] = 0xff;
}
for (i=0; i<6; i++)
addr[i] &= mask[i];
}
/*
* helper function, updates the pointer to cmd with the length
* of the current command, and also cleans up the first word of
* the new command in case it has been clobbered before.
*/
static ipfw_insn *
next_cmd(ipfw_insn *cmd)
{
cmd += F_LEN(cmd);
bzero(cmd, sizeof(*cmd));
return cmd;
}
/*
* A function to fill simple commands of size 1.
* Existing flags are preserved.
*/
static void
fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
{
cmd->opcode = opcode;
cmd->len = ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
cmd->arg1 = arg;
}
/*
* Fetch and add the MAC address and type, with masks. This generates one or
* two microinstructions, and returns the pointer to the last one.
*/
static ipfw_insn *
add_mac(ipfw_insn *cmd, int ac, char *av[])
{
ipfw_insn_mac *mac;
if (ac < 2)
errx(EX_DATAERR, "MAC dst src");
cmd->opcode = O_MACADDR2;
cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
mac = (ipfw_insn_mac *)cmd;
get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
return cmd;
}
static ipfw_insn *
add_mactype(ipfw_insn *cmd, int ac, char *av)
{
if (ac < 1)
errx(EX_DATAERR, "missing MAC type");
if (strcmp(av, "any") != 0) { /* we have a non-null type */
fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
cmd->opcode = O_MAC_TYPE;
return cmd;
} else
return NULL;
}
static ipfw_insn *
add_proto(ipfw_insn *cmd, char *av)
{
struct protoent *pe;
u_char proto = 0;
if (!strncmp(av, "all", strlen(av)))
; /* same as "ip" */
else if ((proto = atoi(av)) > 0)
; /* all done! */
else if ((pe = getprotobyname(av)) != NULL)
proto = pe->p_proto;
else
return NULL;
if (proto != IPPROTO_IP)
fill_cmd(cmd, O_PROTO, 0, proto);
return cmd;
}
static ipfw_insn *
add_srcip(ipfw_insn *cmd, char *av)
{
fill_ip((ipfw_insn_ip *)cmd, av);
if (cmd->opcode == O_IP_DST_SET) /* set */
cmd->opcode = O_IP_SRC_SET;
else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */
cmd->opcode = O_IP_SRC_ME;
else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */
cmd->opcode = O_IP_SRC;
else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip)) /* addr/mask */
cmd->opcode = O_IP_SRC_MASK;
return cmd;
}
static ipfw_insn *
add_dstip(ipfw_insn *cmd, char *av)
{
fill_ip((ipfw_insn_ip *)cmd, av);
if (cmd->opcode == O_IP_DST_SET) /* set */
;
else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) /* me */
cmd->opcode = O_IP_DST_ME;
else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32)) /* one IP */
cmd->opcode = O_IP_DST;
else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip)) /* addr/mask */
cmd->opcode = O_IP_DST_MASK;
return cmd;
}
static ipfw_insn *
add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
{
if (!strncmp(av, "any", strlen(av))) {
return NULL;
} else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
/* XXX todo: check that we have a protocol with ports */
cmd->opcode = opcode;
return cmd;
}
return NULL;
}
/*
* Parse arguments and assemble the microinstructions which make up a rule.
* Rules are added into the 'rulebuf' and then copied in the correct order
* into the actual rule.
*
* The syntax for a rule starts with the action, followed by an
* optional log action, and the various match patterns.
* In the assembled microcode, the first opcode must be an O_PROBE_STATE
* (generated if the rule includes a keep-state option), then the
* various match patterns, the "log" action, and the actual action.
*
*/
static void
add(int ac, char *av[])
{
/*
* rules are added into the 'rulebuf' and then copied in
* the correct order into the actual rule.
* Some things that need to go out of order (prob, action etc.)
* go into actbuf[].
*/
static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255];
ipfw_insn *src, *dst, *cmd, *action, *prev;
ipfw_insn *first_cmd; /* first match pattern */
struct ip_fw *rule;
/*
* various flags used to record that we entered some fields.
*/
ipfw_insn *have_state = NULL; /* check-state or keep-state */
int i;
int open_par = 0; /* open parenthesis ( */
/* proto is here because it is used to fetch ports */
u_char proto = IPPROTO_IP; /* default protocol */
double match_prob = 1; /* match probability, default is always match */
bzero(actbuf, sizeof(actbuf)); /* actions go here */
bzero(cmdbuf, sizeof(cmdbuf));
bzero(rulebuf, sizeof(rulebuf));
rule = (struct ip_fw *)rulebuf;
cmd = (ipfw_insn *)cmdbuf;
action = (ipfw_insn *)actbuf;
av++; ac--;
/* [rule N] -- Rule number optional */
if (ac && isdigit(**av)) {
rule->rulenum = atoi(*av);
av++;
ac--;
}
/* [set N] -- set number (0..30), optional */
if (ac > 1 && !strncmp(*av, "set", strlen(*av))) {
int set = strtoul(av[1], NULL, 10);
if (set < 0 || set > 30)
errx(EX_DATAERR, "illegal set %s", av[1]);
rule->set = set;
av += 2; ac -= 2;
}
/* [prob D] -- match probability, optional */
if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
match_prob = strtod(av[1], NULL);
if (match_prob <= 0 || match_prob > 1)
errx(EX_DATAERR, "illegal match prob. %s", av[1]);
av += 2; ac -= 2;
}
/* action -- mandatory */
NEED1("missing action");
i = match_token(rule_actions, *av);
ac--; av++;
action->len = 1; /* default */
switch(i) {
case TOK_CHECKSTATE:
have_state = action;
action->opcode = O_CHECK_STATE;
break;
case TOK_ACCEPT:
action->opcode = O_ACCEPT;
break;
case TOK_DENY:
action->opcode = O_DENY;
action->arg1 = 0;
break;
case TOK_REJECT:
action->opcode = O_REJECT;
action->arg1 = ICMP_UNREACH_HOST;
break;
case TOK_RESET:
action->opcode = O_REJECT;
action->arg1 = ICMP_REJECT_RST;
break;
case TOK_UNREACH:
action->opcode = O_REJECT;
NEED1("missing reject code");
fill_reject_code(&action->arg1, *av);
ac--; av++;
break;
case TOK_COUNT:
action->opcode = O_COUNT;
break;
case TOK_QUEUE:
case TOK_PIPE:
action->len = F_INSN_SIZE(ipfw_insn_pipe);
case TOK_SKIPTO:
if (i == TOK_QUEUE)
action->opcode = O_QUEUE;
else if (i == TOK_PIPE)
action->opcode = O_PIPE;
else if (i == TOK_SKIPTO)
action->opcode = O_SKIPTO;
NEED1("missing skipto/pipe/queue number");
action->arg1 = strtoul(*av, NULL, 10);
av++; ac--;
break;
case TOK_DIVERT:
case TOK_TEE:
action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
NEED1("missing divert/tee port");
action->arg1 = strtoul(*av, NULL, 0);
if (action->arg1 == 0) {
struct servent *s;
setservent(1);
s = getservbyname(av[0], "divert");
if (s != NULL)
action->arg1 = ntohs(s->s_port);
else
errx(EX_DATAERR, "illegal divert/tee port");
}
ac--; av++;
break;
case TOK_FORWARD: {
ipfw_insn_sa *p = (ipfw_insn_sa *)action;
char *s, *end;
NEED1("missing forward address[:port]");
action->opcode = O_FORWARD_IP;
action->len = F_INSN_SIZE(ipfw_insn_sa);
p->sa.sin_len = sizeof(struct sockaddr_in);
p->sa.sin_family = AF_INET;
p->sa.sin_port = 0;
/*
* locate the address-port separator (':' or ',')
*/
s = strchr(*av, ':');
if (s == NULL)
s = strchr(*av, ',');
if (s != NULL) {
*(s++) = '\0';
i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
if (s == end)
errx(EX_DATAERR,
"illegal forwarding port ``%s''", s);
p->sa.sin_port = (u_short)i;
}
lookup_host(*av, &(p->sa.sin_addr));
}
ac--; av++;
break;
default:
errx(EX_DATAERR, "invalid action %s\n", av[-1]);
}
action = next_cmd(action);
/*
* [log [logamount N]] -- log, optional
*
* If exists, it goes first in the cmdbuf, but then it is
* skipped in the copy section to the end of the buffer.
*/
if (ac && !strncmp(*av, "log", strlen(*av))) {
ipfw_insn_log *c = (ipfw_insn_log *)cmd;
cmd->len = F_INSN_SIZE(ipfw_insn_log);
cmd->opcode = O_LOG;
av++; ac--;
if (ac && !strncmp(*av, "logamount", strlen(*av))) {
ac--; av++;
NEED1("logamount requires argument");
c->max_log = atoi(*av);
if (c->max_log < 0)
errx(EX_DATAERR, "logamount must be positive");
ac--; av++;
}
cmd = next_cmd(cmd);
}
if (have_state) /* must be a check-state, we are done */
goto done;
#define OR_START(target) \
if (ac && (*av[0] == '(' || *av[0] == '{')) { \
if (open_par) \
errx(EX_USAGE, "nested \"(\" not allowed\n"); \
prev = NULL; \
open_par = 1; \
if ( (av[0])[1] == '\0') { \
ac--; av++; \
} else \
(*av)++; \
} \
target: \
#define CLOSE_PAR \
if (open_par) { \
if (ac && ( \
!strncmp(*av, ")", strlen(*av)) || \
!strncmp(*av, "}", strlen(*av)) )) { \
prev = NULL; \
open_par = 0; \
ac--; av++; \
} else \
errx(EX_USAGE, "missing \")\"\n"); \
}
#define NOT_BLOCK \
if (ac && !strncmp(*av, "not", strlen(*av))) { \
if (cmd->len & F_NOT) \
errx(EX_USAGE, "double \"not\" not allowed\n"); \
cmd->len |= F_NOT; \
ac--; av++; \
}
#define OR_BLOCK(target) \
if (ac && !strncmp(*av, "or", strlen(*av))) { \
if (prev == NULL || open_par == 0) \
errx(EX_DATAERR, "invalid OR block"); \
prev->len |= F_OR; \
ac--; av++; \
goto target; \
} \
CLOSE_PAR;
first_cmd = cmd;
#if 0
/*
* MAC addresses, optional.
* If we have this, we skip the part "proto from src to dst"
* and jump straight to the option parsing.
*/
NOT_BLOCK;
NEED1("missing protocol");
if (!strncmp(*av, "MAC", strlen(*av)) ||
!strncmp(*av, "mac", strlen(*av))) {
ac--; av++; /* the "MAC" keyword */
add_mac(cmd, ac, av); /* exits in case of errors */
cmd = next_cmd(cmd);
ac -= 2; av += 2; /* dst-mac and src-mac */
NOT_BLOCK;
NEED1("missing mac type");
if (add_mactype(cmd, ac, av[0]))
cmd = next_cmd(cmd);
ac--; av++; /* any or mac-type */
goto read_options;
}
#endif
/*
* protocol, mandatory
*/
OR_START(get_proto);
NOT_BLOCK;
NEED1("missing protocol");
if (add_proto(cmd, *av)) {
av++; ac--;
if (F_LEN(cmd) == 0) /* plain IP */
proto = 0;
else {
proto = cmd->arg1;
prev = cmd;
cmd = next_cmd(cmd);
}
} else if (first_cmd != cmd) {
errx(EX_DATAERR, "invalid protocol ``%s''", *av);
} else
goto read_options;
OR_BLOCK(get_proto);
/*
* "from", mandatory
*/
if (!ac || strncmp(*av, "from", strlen(*av)))
errx(EX_USAGE, "missing ``from''");
ac--; av++;
/*
* source IP, mandatory
*/
OR_START(source_ip);
NOT_BLOCK; /* optional "not" */
NEED1("missing source address");
if (add_srcip(cmd, *av)) {
ac--; av++;
if (F_LEN(cmd) != 0) { /* ! any */
prev = cmd;
cmd = next_cmd(cmd);
}
}
OR_BLOCK(source_ip);
/*
* source ports, optional
*/
NOT_BLOCK; /* optional "not" */
if (ac) {
if (!strncmp(*av, "any", strlen(*av)) ||
add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
ac--; av++;
if (F_LEN(cmd) != 0)
cmd = next_cmd(cmd);
}
}
/*
* "to", mandatory
*/
if (!ac || strncmp(*av, "to", strlen(*av)))
errx(EX_USAGE, "missing ``to''");
av++; ac--;
/*
* destination, mandatory
*/
OR_START(dest_ip);
NOT_BLOCK; /* optional "not" */
NEED1("missing dst address");
if (add_dstip(cmd, *av)) {
ac--; av++;
if (F_LEN(cmd) != 0) { /* ! any */
prev = cmd;
cmd = next_cmd(cmd);
}
}
OR_BLOCK(dest_ip);
/*
* dest. ports, optional
*/
NOT_BLOCK; /* optional "not" */
if (ac) {
if (!strncmp(*av, "any", strlen(*av)) ||
add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
ac--; av++;
if (F_LEN(cmd) != 0)
cmd = next_cmd(cmd);
}
}
read_options:
if (ac && first_cmd == cmd) {
/*
* nothing specified so far, store in the rule to ease
* printout later.
*/
rule->_pad = 1;
}
prev = NULL;
while (ac) {
char *s;
ipfw_insn_u32 *cmd32; /* alias for cmd */
s = *av;
cmd32 = (ipfw_insn_u32 *)cmd;
if (*s == '!') { /* alternate syntax for NOT */
if (cmd->len & F_NOT)
errx(EX_USAGE, "double \"not\" not allowed\n");
cmd->len = F_NOT;
s++;
}
i = match_token(rule_options, s);
ac--; av++;
switch(i) {
case TOK_NOT:
if (cmd->len & F_NOT)
errx(EX_USAGE, "double \"not\" not allowed\n");
cmd->len = F_NOT;
break;
case TOK_OR:
if (open_par == 0 || prev == NULL)
errx(EX_USAGE, "invalid \"or\" block\n");
prev->len |= F_OR;
break;
case TOK_STARTBRACE:
if (open_par)
errx(EX_USAGE, "+nested \"(\" not allowed\n");
open_par = 1;
break;
case TOK_ENDBRACE:
if (!open_par)
errx(EX_USAGE, "+missing \")\"\n");
open_par = 0;
prev = NULL;
break;
case TOK_IN:
fill_cmd(cmd, O_IN, 0, 0);
break;
case TOK_OUT:
cmd->len ^= F_NOT; /* toggle F_NOT */
fill_cmd(cmd, O_IN, 0, 0);
break;
case TOK_FRAG:
fill_cmd(cmd, O_FRAG, 0, 0);
break;
case TOK_LAYER2:
fill_cmd(cmd, O_LAYER2, 0, 0);
break;
case TOK_XMIT:
case TOK_RECV:
case TOK_VIA:
NEED1("recv, xmit, via require interface name"
" or address");
fill_iface((ipfw_insn_if *)cmd, av[0]);
ac--; av++;
if (F_LEN(cmd) == 0) /* not a valid address */
break;
if (i == TOK_XMIT)
cmd->opcode = O_XMIT;
else if (i == TOK_RECV)
cmd->opcode = O_RECV;
else if (i == TOK_VIA)
cmd->opcode = O_VIA;
break;
case TOK_ICMPTYPES:
NEED1("icmptypes requires list of types");
fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
av++; ac--;
break;
case TOK_IPTTL:
NEED1("ipttl requires TTL");
if (strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_IPTTL))
errx(EX_DATAERR, "invalid ipttl %s", *av);
} else
fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
ac--; av++;
break;
case TOK_IPID:
NEED1("ipid requires id");
if (strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_IPID))
errx(EX_DATAERR, "invalid ipid %s", *av);
} else
fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
ac--; av++;
break;
case TOK_IPLEN:
NEED1("iplen requires length");
if (strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_IPLEN))
errx(EX_DATAERR, "invalid ip len %s", *av);
} else
fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
ac--; av++;
break;
case TOK_IPVER:
NEED1("ipver requires version");
fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
ac--; av++;
break;
case TOK_IPPRECEDENCE:
NEED1("ipprecedence requires value");
fill_cmd(cmd, O_IPPRECEDENCE, 0,
(strtoul(*av, NULL, 0) & 7) << 5);
ac--; av++;
break;
case TOK_IPOPTS:
NEED1("missing argument for ipoptions");
fill_flags(cmd, O_IPOPT, f_ipopts, *av);
ac--; av++;
break;
case TOK_IPTOS:
NEED1("missing argument for iptos");
fill_flags(cmd, O_IPTOS, f_iptos, *av);
ac--; av++;
break;
case TOK_UID:
NEED1("uid requires argument");
{
char *end;
uid_t uid;
struct passwd *pwd;
cmd->opcode = O_UID;
uid = strtoul(*av, &end, 0);
pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
if (pwd == NULL)
errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
cmd32->d[0] = pwd->pw_uid;
cmd->len = F_INSN_SIZE(ipfw_insn_u32);
ac--; av++;
}
break;
case TOK_GID:
NEED1("gid requires argument");
{
char *end;
gid_t gid;
struct group *grp;
cmd->opcode = O_GID;
gid = strtoul(*av, &end, 0);
grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
if (grp == NULL)
errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
cmd32->d[0] = grp->gr_gid;
cmd->len = F_INSN_SIZE(ipfw_insn_u32);
ac--; av++;
}
break;
case TOK_ESTAB:
fill_cmd(cmd, O_ESTAB, 0, 0);
break;
case TOK_SETUP:
fill_cmd(cmd, O_TCPFLAGS, 0,
(TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
break;
case TOK_TCPOPTS:
NEED1("missing argument for tcpoptions");
fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
ac--; av++;
break;
case TOK_TCPSEQ:
case TOK_TCPACK:
NEED1("tcpseq/tcpack requires argument");
cmd->len = F_INSN_SIZE(ipfw_insn_u32);
cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
ac--; av++;
break;
case TOK_TCPWIN:
NEED1("tcpwin requires length");
fill_cmd(cmd, O_TCPWIN, 0,
htons(strtoul(*av, NULL, 0)));
ac--; av++;
break;
case TOK_TCPFLAGS:
NEED1("missing argument for tcpflags");
cmd->opcode = O_TCPFLAGS;
fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
ac--; av++;
break;
case TOK_KEEPSTATE:
if (open_par)
errx(EX_USAGE, "keep-state cannot be part "
"of an or block");
if (have_state)
errx(EX_USAGE, "only one of keep-state "
"and limit is allowed");
have_state = cmd;
fill_cmd(cmd, O_KEEP_STATE, 0, 0);
break;
case TOK_LIMIT:
if (open_par)
errx(EX_USAGE, "limit cannot be part "
"of an or block");
if (have_state)
errx(EX_USAGE, "only one of keep-state "
"and limit is allowed");
NEED1("limit needs mask and # of connections");
have_state = cmd;
{
ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
cmd->len = F_INSN_SIZE(ipfw_insn_limit);
cmd->opcode = O_LIMIT;
c->limit_mask = 0;
c->conn_limit = 0;
for (; ac >1 ;) {
int val;
val = match_token(limit_masks, *av);
if (val <= 0)
break;
c->limit_mask |= val;
ac--; av++;
}
c->conn_limit = atoi(*av);
if (c->conn_limit == 0)
errx(EX_USAGE, "limit: limit must be >0");
if (c->limit_mask == 0)
errx(EX_USAGE, "missing limit mask");
ac--; av++;
}
break;
case TOK_PROTO:
NEED1("missing protocol");
if (add_proto(cmd, *av)) {
proto = cmd->arg1;
ac--; av++;
} else
errx(EX_DATAERR, "invalid protocol ``%s''",
*av);
break;
case TOK_SRCIP:
NEED1("missing source IP");
if (add_srcip(cmd, *av)) {
ac--; av++;
}
break;
case TOK_DSTIP:
NEED1("missing destination IP");
if (add_dstip(cmd, *av)) {
ac--; av++;
}
break;
case TOK_SRCPORT:
NEED1("missing source port");
if (!strncmp(*av, "any", strlen(*av)) ||
add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
ac--; av++;
} else
errx(EX_DATAERR, "invalid source port %s", *av);
break;
case TOK_DSTPORT:
NEED1("missing destination port");
if (!strncmp(*av, "any", strlen(*av)) ||
add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
ac--; av++;
} else
errx(EX_DATAERR, "invalid destination port %s",
*av);
break;
case TOK_MAC:
if (ac < 2)
errx(EX_USAGE, "MAC dst-mac src-mac");
if (add_mac(cmd, ac, av)) {
ac -= 2; av += 2;
}
break;
case TOK_MACTYPE:
NEED1("missing mac type");
if (!add_mactype(cmd, ac, *av))
errx(EX_DATAERR, "invalid mac type %s", *av);
ac--; av++;
break;
case TOK_VERREVPATH:
fill_cmd(cmd, O_VERREVPATH, 0, 0);
break;
case TOK_IPSEC:
fill_cmd(cmd, O_IPSEC, 0, 0);
break;
default:
errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
}
if (F_LEN(cmd) > 0) { /* prepare to advance */
prev = cmd;
cmd = next_cmd(cmd);
}
}
done:
/*
* Now copy stuff into the rule.
* If we have a keep-state option, the first instruction
* must be a PROBE_STATE (which is generated here).
* If we have a LOG option, it was stored as the first command,
* and now must be moved to the top of the action part.
*/
dst = (ipfw_insn *)rule->cmd;
/*
* First thing to write into the command stream is the match probability.
*/
if (match_prob != 1) { /* 1 means always match */
dst->opcode = O_PROB;
dst->len = 2;
*((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
dst += dst->len;
}
/*
* generate O_PROBE_STATE if necessary
*/
if (have_state && have_state->opcode != O_CHECK_STATE) {
fill_cmd(dst, O_PROBE_STATE, 0, 0);
dst = next_cmd(dst);
}
/*
* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT
*/
for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
i = F_LEN(src);
switch (src->opcode) {
case O_LOG:
case O_KEEP_STATE:
case O_LIMIT:
break;
default:
bcopy(src, dst, i * sizeof(u_int32_t));
dst += i;
}
}
/*
* put back the have_state command as last opcode
*/
if (have_state && have_state->opcode != O_CHECK_STATE) {
i = F_LEN(have_state);
bcopy(have_state, dst, i * sizeof(u_int32_t));
dst += i;
}
/*
* start action section
*/
rule->act_ofs = dst - rule->cmd;
/*
* put back O_LOG if necessary
*/
src = (ipfw_insn *)cmdbuf;
if ( src->opcode == O_LOG ) {
i = F_LEN(src);
bcopy(src, dst, i * sizeof(u_int32_t));
dst += i;
}
/*
* copy all other actions
*/
for (src = (ipfw_insn *)actbuf; src != action; src += i) {
i = F_LEN(src);
bcopy(src, dst, i * sizeof(u_int32_t));
dst += i;
}
rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
i = (void *)dst - (void *)rule;
if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
if (!do_quiet)
show_ipfw(rule, 10, 10);
}
static void
zero(int ac, char *av[])
{
int rulenum;
int failed = EX_OK;
av++; ac--;
if (!ac) {
/* clear all entries */
if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
if (!do_quiet)
printf("Accounting cleared.\n");
return;
}
while (ac) {
/* Rule number */
if (isdigit(**av)) {
rulenum = atoi(*av);
av++;
ac--;
if (setsockopt(s, IPPROTO_IP,
IP_FW_ZERO, &rulenum, sizeof rulenum)) {
warn("rule %u: setsockopt(IP_FW_ZERO)",
rulenum);
failed = EX_UNAVAILABLE;
} else if (!do_quiet)
printf("Entry %d cleared\n", rulenum);
} else {
errx(EX_USAGE, "invalid rule number ``%s''", *av);
}
}
if (failed != EX_OK)
exit(failed);
}
static void
resetlog(int ac, char *av[])
{
int rulenum;
int failed = EX_OK;
av++; ac--;
if (!ac) {
/* clear all entries */
if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
if (!do_quiet)
printf("Logging counts reset.\n");
return;
}
while (ac) {
/* Rule number */
if (isdigit(**av)) {
rulenum = atoi(*av);
av++;
ac--;
if (setsockopt(s, IPPROTO_IP,
IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
warn("rule %u: setsockopt(IP_FW_RESETLOG)",
rulenum);
failed = EX_UNAVAILABLE;
} else if (!do_quiet)
printf("Entry %d logging count reset\n",
rulenum);
} else {
errx(EX_DATAERR, "invalid rule number ``%s''", *av);
}
}
if (failed != EX_OK)
exit(failed);
}
static void
flush()
{
int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
if (!do_force && !do_quiet) { /* need to ask user */
int c;
printf("Are you sure? [yn] ");
fflush(stdout);
do {
c = toupper(getc(stdin));
while (c != '\n' && getc(stdin) != '\n')
if (feof(stdin))
return; /* and do not flush */
} while (c != 'Y' && c != 'N');
printf("\n");
if (c == 'N') /* user said no */
return;
}
if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
do_pipe ? "DUMMYNET" : "FW");
if (!do_quiet)
printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
}
static int
ipfw_main(int ac, char **av)
{
int ch;
if (ac == 1)
show_usage();
/* Set the force flag for non-interactive processes */
do_force = !isatty(STDIN_FILENO);
optind = optreset = 1;
while ((ch = getopt(ac, av, "hs:acdefNqStv")) != -1)
switch (ch) {
case 'h': /* help */
help();
break; /* NOTREACHED */
case 's': /* sort */
do_sort = atoi(optarg);
break;
case 'a':
do_acct = 1;
break;
case 'c':
do_compact = 1;
break;
case 'd':
do_dynamic = 1;
break;
case 'e':
do_expired = 1;
break;
case 'f':
do_force = 1;
break;
case 'N':
do_resolv = 1;
break;
case 'q':
do_quiet = 1;
break;
case 'S':
show_sets = 1;
break;
case 't':
do_time = 1;
break;
case 'v': /* verbose */
verbose++;
break;
default:
show_usage();
}
ac -= optind;
av += optind;
NEED1("bad arguments, for usage summary ``ipfw''");
/*
* optional: pipe or queue
*/
if (!strncmp(*av, "pipe", strlen(*av))) {
do_pipe = 1;
ac--;
av++;
} else if (!strncmp(*av, "queue", strlen(*av))) {
do_pipe = 2;
ac--;
av++;
}
NEED1("missing command");
/*
* for pipes and queues we normally say 'pipe NN config'
* but the code is easier to parse as 'pipe config NN'
* so we swap the two arguments.
*/
if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') {
char *p = av[0];
av[0] = av[1];
av[1] = p;
}
if (!strncmp(*av, "add", strlen(*av)))
add(ac, av);
else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
config_pipe(ac, av);
else if (!strncmp(*av, "delete", strlen(*av)))
delete(ac, av);
else if (!strncmp(*av, "flush", strlen(*av)))
flush();
else if (!strncmp(*av, "zero", strlen(*av)))
zero(ac, av);
else if (!strncmp(*av, "resetlog", strlen(*av)))
resetlog(ac, av);
else if (!strncmp(*av, "print", strlen(*av)) ||
!strncmp(*av, "list", strlen(*av)))
list(ac, av);
else if (!strncmp(*av, "set", strlen(*av)))
sets_handler(ac, av);
else if (!strncmp(*av, "enable", strlen(*av)))
sysctl_handler(ac, av, 1);
else if (!strncmp(*av, "disable", strlen(*av)))
sysctl_handler(ac, av, 0);
else if (!strncmp(*av, "show", strlen(*av))) {
do_acct++;
list(ac, av);
} else
errx(EX_USAGE, "bad command `%s'", *av);
return 0;
}
static void
ipfw_readfile(int ac, char *av[])
{
#define MAX_ARGS 32
#define WHITESP " \t\f\v\n\r"
char buf[BUFSIZ];
char *a, *p, *args[MAX_ARGS], *cmd = NULL;
char linename[10];
int i=0, lineno=0, qflag=0, pflag=0, status;
FILE *f = NULL;
pid_t preproc = 0;
int c;
while ((c = getopt(ac, av, "p:q")) != -1) {
switch(c) {
case 'p':
pflag = 1;
cmd = optarg;
args[0] = cmd;
i = 1;
break;
case 'q':
qflag = 1;
break;
default:
errx(EX_USAGE, "bad arguments, for usage"
" summary ``ipfw''");
}
if (pflag)
break;
}
if (pflag) {
/* Pass all but the last argument to the preprocessor. */
while (optind < ac - 1) {
if (i >= MAX_ARGS)
errx(EX_USAGE, "too many preprocessor options");
args[i++] = av[optind++];
}
}
av += optind;
ac -= optind;
if (ac != 1)
errx(EX_USAGE, "extraneous filename arguments");
if ((f = fopen(av[0], "r")) == NULL)
err(EX_UNAVAILABLE, "fopen: %s", av[0]);
if (pflag) {
/* pipe through preprocessor (cpp or m4) */
int pipedes[2];
args[i] = 0;
if (pipe(pipedes) == -1)
err(EX_OSERR, "cannot create pipe");
switch((preproc = fork())) {
case -1:
err(EX_OSERR, "cannot fork");
case 0:
/* child */
if (dup2(fileno(f), 0) == -1
|| dup2(pipedes[1], 1) == -1)
err(EX_OSERR, "dup2()");
fclose(f);
close(pipedes[1]);
close(pipedes[0]);
execvp(cmd, args);
err(EX_OSERR, "execvp(%s) failed", cmd);
default:
/* parent */
fclose(f);
close(pipedes[1]);
if ((f = fdopen(pipedes[0], "r")) == NULL) {
int savederrno = errno;
(void)kill(preproc, SIGTERM);
errno = savederrno;
err(EX_OSERR, "fdopen()");
}
}
}
while (fgets(buf, BUFSIZ, f)) {
lineno++;
sprintf(linename, "Line %d", lineno);
args[0] = linename;
if (*buf == '#')
continue;
if ((p = strchr(buf, '#')) != NULL)
*p = '\0';
i = 1;
if (qflag)
args[i++] = "-q";
for (a = strtok(buf, WHITESP);
a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
args[i] = a;
if (i == (qflag? 2: 1))
continue;
if (i == MAX_ARGS)
errx(EX_USAGE, "%s: too many arguments",
linename);
args[i] = NULL;
ipfw_main(i, args);
}
fclose(f);
if (pflag) {
if (waitpid(preproc, &status, 0) == -1)
errx(EX_OSERR, "waitpid()");
if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
errx(EX_UNAVAILABLE,
"preprocessor exited with status %d",
WEXITSTATUS(status));
else if (WIFSIGNALED(status))
errx(EX_UNAVAILABLE,
"preprocessor exited with signal %d",
WTERMSIG(status));
}
}
int
main(int ac, char *av[])
{
s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
if (s < 0)
err(EX_UNAVAILABLE, "socket");
/*
* If the last argument is an absolute pathname, interpret it
* as a file to be preprocessed.
*/
if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
ipfw_readfile(ac, av);
else
ipfw_main(ac, av);
return EX_OK;
}
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