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freebsd-nq/sbin/ipfw/ipfw2.c
Luigi Rizzo 0a7197a83c A bunch of minor fixes: 
* accept "icmptype" as an alias for "icmptypes";
* remove an extra whitespace after "log" rules;
* print correctly the "limit" masks;
* correct a typo in parsing dummynet arguments (this caused a coredump);
* do not allow specifying both "check-state" and "limit", they are
  (and have always been) mutually exclusive;
* remove an extra print of the rule before installing it;
* make stdout buffered -- otherwise, if you log its output with syslog,
  you will see one entry for each printf(). Rather unpleasant.
2002-07-13 15:57:23 +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 */
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_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_PLR,
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 },
{ "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 },
{ "not", TOK_NOT }, /* pseudo option */
{ "!", /* escape ? */ TOK_NOT }, /* pseudo option */
{ "or", TOK_OR }, /* pseudo option */
{ "|", /* escape */ TOK_OR }, /* pseudo option */
{ NULL, TOK_NULL },
{ NULL, 0 }
};
/**
* 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)
{
u_int16_t *p = cmd->ports;
int i;
char *sep= " ";
if (cmd->o.len & F_NOT)
printf(" not");
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.
*/
static int
strtoport(char *s, char **end, int base, int proto)
{
char *s1, sep;
int i;
if ( *s == '\0')
goto none;
if (isdigit(*s))
return strtol(s, end, base);
/*
* find separator and replace with a '\0'
*/
for (s1 = s; *s1 && isalnum(*s1) ; s1++)
;
sep = *s1;
*s1 = '\0';
if (proto == IPPROTO_ETHERTYPE) {
i = match_token(ether_types, s);
*s1 = sep;
if (i == -1) { /* not found */
*end = s;
return 0;
} else {
*end = s1;
return i;
}
} else {
struct protoent *pe = NULL;
struct servent *se;
if (proto != 0)
pe = getprotobynumber(proto);
setservent(1);
se = getservbyname(s, pe ? pe->p_name : NULL);
*s1 = sep;
if (se != NULL) {
*end = s1;
return ntohs(se->s_port);
}
}
none:
*end = s;
return 0;
}
/*
* 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;
for (; *av ; i++, p +=2 ) {
u_int16_t a, b;
char *s;
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 */
break;
av = s+1;
}
if (i > 0) {
if (i+1 > F_LEN_MASK)
errx(EX_DATAERR, "too many port range\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)
{
struct hostent *he = NULL;
int mb;
printf("%s ", cmd->o.len & F_NOT ? " not": "");
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;
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);
for (i=0; i < cmd->o.arg1; i++)
if (d[ i/32] & (1<<(i & 31))) {
printf("%c%d", comma, i+x);
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.
*/
#define HAVE_PROTO 1
#define HAVE_SRCIP 2
#define HAVE_DSTIP 4
#define HAVE_MAC 8
static void
show_prerequisites(int *flags, int want)
{
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 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 */
printf("%05u ", rule->rulenum);
if (do_acct)
printf("%10qu %10qu ", rule->pcnt, rule->bcnt);
if (do_time) {
if (rule->timestamp) {
char timestr[30];
time_t t = _long_to_time(rule->timestamp);
strcpy(timestr, ctime(&t));
*strchr(timestr, '\n') = '\0';
printf("%s ", timestr);
} else {
printf(" ");
}
}
/*
* 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");
/* avoid printing anything else */
flags = HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP;
break;
case O_PROB:
{
ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
double d = 1.0 * p->d[0];
d = 1 - (d / 0x7fffffff);
printf("prob %f ", d);
}
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", ntohs(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
*/
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;
switch(cmd->opcode) {
case O_PROBE_STATE:
break; /* no need to print anything here */
case O_MACADDR2: {
ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
if ( (flags & HAVE_MAC) == 0)
printf(" MAC");
flags |= HAVE_MAC;
if (cmd->len & F_NOT)
printf(" not");
print_mac( m->addr, m->mask);
print_mac( m->addr + 6, m->mask + 6);
}
break;
case O_MAC_TYPE:
print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE);
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);
if (!(flags & HAVE_SRCIP))
printf(" from");
if ((cmd->len & F_OR) && !or_block)
printf(" {");
print_ip((ipfw_insn_ip *)cmd);
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);
if (!(flags & HAVE_DSTIP))
printf(" to");
if ((cmd->len & F_OR) && !or_block)
printf(" {");
print_ip((ipfw_insn_ip *)cmd);
flags |= HAVE_DSTIP;
break;
case O_IP_DSTPORT:
show_prerequisites(&flags,
HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
case O_IP_SRCPORT:
show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP);
print_newports((ipfw_insn_u16 *)cmd, proto);
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 (pe)
printf(" %s", pe->p_name);
else
printf(" %u", cmd->arg1);
}
flags |= HAVE_PROTO;
break;
default: /*options ... */
show_prerequisites(&flags,
HAVE_PROTO|HAVE_SRCIP|HAVE_DSTIP);
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:
printf(" ipid %u", cmd->arg1 );
break;
case O_IPTTL:
printf(" ipttl %u", cmd->arg1 );
break;
case O_IPVER:
printf(" ipver %u", cmd->arg1 );
break;
case O_IPPRECEDENCE:
printf(" ipprecedence %u", (cmd->arg1) >> 5 );
break;
case O_IPLEN:
printf(" iplen %u", cmd->arg1 );
break;
case O_IPOPTS:
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_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_PROTO|HAVE_SRCIP|HAVE_DSTIP);
printf("\n");
}
static void
show_dyn_ipfw(ipfw_dyn_rule *d)
{
struct protoent *pe;
struct in_addr a;
if (!do_expired) {
if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
return;
}
printf("%05d %10qu %10qu (%ds)",
(int)(d->rule), d->pcnt, 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);
}
}
static void
list(int ac, char *av[])
{
struct ip_fw *r;
ipfw_dyn_rule *dynrules, *d;
void *lim, *data = NULL;
int n, nbytes, nstat, ndyn;
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 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);
if (do_dynamic && ndyn) {
printf("## Dynamic rules (%d):\n", ndyn);
for (n = 0, d = dynrules; n < ndyn; n++, d++)
show_dyn_ipfw(d);
}
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);
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++) {
if ((int)(d->rule) > rnum)
break;
if ((int)(d->rule) == rnum)
show_dyn_ipfw(d);
}
}
}
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;
fprintf(stderr,"-- set size %d cmdlen %d\n",
cmd->o.arg1, cmd->o.len );
for (i = 0; i < cmd->o.arg1/32 ; i++)
d[i] = 0; /* clear masks */
av = p+1;
low = cmd->addr.s_addr & 0xff;
high = low + cmd->o.arg1 - 1;
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;
d[ a/32] |= 1<<(a & 31);
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[])
{
int rulenum;
struct dn_pipe pipe;
int i;
int exitval = EX_OK;
memset(&pipe, 0, sizeof pipe);
av++; ac--;
/* 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;
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_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; /* also *src */
if (ac <3)
errx(EX_DATAERR, "MAC dst src type");
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 */
av += 2;
if (strcmp(av[0], "any") != 0) { /* we have a non-null port */
cmd += F_LEN(cmd);
fill_newports((ipfw_insn_u16 *)cmd, av[0], IPPROTO_ETHERTYPE);
cmd->opcode = O_MAC_TYPE;
}
return cmd;
}
/*
* 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 a 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;
struct ip_fw *rule;
/*
* various flags used to record that we entered some fields.
*/
int have_mac = 0; /* set if we have a MAC address */
int have_state = 0; /* 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 */
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--;
}
/* [prob D] -- match probability, optional */
if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
double d = strtod(av[1], NULL);
if (d <= 0 || d > 1)
errx(EX_DATAERR, "illegal match prob. %s", av[1]);
if (d != 1) { /* 1 means always match */
action->opcode = O_PROB;
action->len = 2;
*((int32_t *)(action+1)) =
(int32_t)((1 - d) * 0x7fffffff);
action += action->len;
}
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 = 1;
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 = htons( (u_short)i );
}
lookup_host(*av, &(p->sa.sin_addr));
}
ac--; av++;
break;
default:
errx(EX_DATAERR, "invalid action %s\n", *av);
}
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) {
have_state = 0;
goto done;
}
#define OR_START(target) \
if (ac && (*av[0] == '(' || *av[0] == '{')) { \
if (open_par) \
errx(EX_USAGE, "nested \"(\" not allowed\n"); \
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)) )) { \
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;
/*
* protocol, mandatory
*/
OR_START(get_proto);
NOT_BLOCK;
NEED1("missing protocol");
{
struct protoent *pe;
if (!strncmp(*av, "all", strlen(*av)))
; /* same as "ip" */
else if (!strncmp(*av, "MAC", strlen(*av))) {
/* need exactly 3 fields */
cmd = add_mac(cmd, ac-1, av+1); /* exits in case of errors */
ac -= 3;
av += 3;
have_mac = 1;
} else if ((proto = atoi(*av)) > 0)
; /* all done! */
else if ((pe = getprotobyname(*av)) != NULL)
proto = pe->p_proto;
else
errx(EX_DATAERR, "invalid protocol ``%s''", *av);
av++; ac--;
if (proto != IPPROTO_IP)
fill_cmd(cmd, O_PROTO, 0, proto);
}
cmd = next_cmd(cmd);
OR_BLOCK(get_proto);
/*
* "from", mandatory (unless we have a MAC address)
*/
if (!ac || strncmp(*av, "from", strlen(*av))) {
if (have_mac) /* we do not need a "to" address */
goto read_to;
errx(EX_USAGE, "missing ``from''");
}
ac--; av++;
/*
* source IP, mandatory
*/
OR_START(source_ip);
NOT_BLOCK; /* optional "not" */
NEED1("missing source address");
/* source -- mandatory */
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;
/* otherwise len will be zero and the command skipped */
ac--; av++;
prev = cmd; /* in case we need to backtrack */
cmd = next_cmd(cmd);
OR_BLOCK(source_ip);
/*
* source ports, optional
*/
NOT_BLOCK; /* optional "not" */
if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) {
/* XXX todo: check that we have a protocol with ports */
cmd->opcode = O_IP_SRCPORT;
ac--;
av++;
cmd = next_cmd(cmd);
}
read_to:
/*
* "to", mandatory (unless we have a MAC address
*/
if (!ac || strncmp(*av, "to", strlen(*av))) {
if (have_mac)
goto read_options;
errx(EX_USAGE, "missing ``to''");
}
av++; ac--;
/*
* destination, mandatory
*/
OR_START(dest_ip);
NOT_BLOCK; /* optional "not" */
NEED1("missing dst address");
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;
ac--;
av++;
prev = cmd;
cmd = next_cmd(cmd);
OR_BLOCK(dest_ip);
/*
* dest. ports, optional
*/
NOT_BLOCK; /* optional "not" */
if (ac && fill_newports((ipfw_insn_u16 *)cmd, *av, proto)) {
/* XXX todo: check that we have a protocol with ports */
cmd->opcode = O_IP_DSTPORT;
ac--;
av++;
cmd += F_LEN(cmd);
}
read_options:
prev = NULL;
while (ac) {
char *s = *av;
ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd; /* alias */
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 (prev == NULL)
errx(EX_USAGE, "invalid \"or\" block\n");
prev->len |= F_OR;
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");
fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
ac--; av++;
break;
case TOK_IPID:
NEED1("ipid requires length");
fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
ac--; av++;
break;
case TOK_IPLEN:
NEED1("iplen requires length");
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_IPOPTS, f_ipopts, *av);
ac--; av++;
break;
case TOK_IPTOS:
NEED1("missing argument for iptos");
fill_flags(cmd, O_IPOPTS, 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] = 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] = 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 (have_state)
errx(EX_USAGE, "only one of check-state "
"and limit is allowed");
have_state = 1;
fill_cmd(cmd, O_KEEP_STATE, 0, 0);
break;
case TOK_LIMIT:
NEED1("limit needs mask and # of connections");
if (have_state)
errx(EX_USAGE, "only one of check-state "
"and limit is allowed");
{
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++;
have_state = 1;
}
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;
/*
* generate O_PROBE_STATE if necessary
*/
if (have_state) {
fill_cmd(dst, O_PROBE_STATE, 0, 0);
dst = next_cmd(dst);
}
/*
* copy all commands but O_LOG
*/
for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
i = F_LEN(src);
if (src->opcode != O_LOG) {
bcopy(src, 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);
}
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:adefNqtv")) != -1)
switch (ch) {
case 'h': /* help */
help();
break; /* NOTREACHED */
case 's': /* sort */
do_sort = atoi(optarg);
break;
case 'a':
do_acct = 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 '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, "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, "D:U:p:q")) != -1)
switch(c) {
case 'D':
if (!pflag)
errx(EX_USAGE, "-D requires -p");
if (i > MAX_ARGS - 2)
errx(EX_USAGE,
"too many -D or -U options");
args[i++] = "-D";
args[i++] = optarg;
break;
case 'U':
if (!pflag)
errx(EX_USAGE, "-U requires -p");
if (i > MAX_ARGS - 2)
errx(EX_USAGE,
"too many -D or -U options");
args[i++] = "-U";
args[i++] = optarg;
break;
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''");
}
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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