xref: /freebsd-head/sbin/ipfw/ipfw2.c

/*-
 * Copyright (c) 2002-2003 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/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>

#include "ipfw2.h"

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <grp.h>
#include <jail.h>
#include <netdb.h>
#include <pwd.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <time.h>	/* ctime */
#include <timeconv.h>	/* _long_to_time */
#include <unistd.h>
#include <fcntl.h>
#include <stddef.h>	/* offsetof */

#include <net/ethernet.h>
#include <net/if.h>		/* only IFNAMSIZ */
#include <netinet/in.h>
#include <netinet/in_systm.h>	/* only n_short, n_long */
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/ip_fw.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>

struct cmdline_opts g_co;	/* global options */

struct format_opts {
	int bcwidth;
	int pcwidth;
	int show_counters;
	int show_time;		/* show timestamp */
	uint32_t set_mask;	/* enabled sets mask */
	uint32_t flags;		/* request flags */
	uint32_t first;		/* first rule to request */
	uint32_t last;		/* last rule to request */
	uint32_t dcnt;		/* number of dynamic states */
	ipfw_obj_ctlv *tstate;	/* table state data */
};

int resvd_set_number = RESVD_SET;

static int ipfw_socket = -1;

#define	CHECK_LENGTH(v, len) do {				\
	if ((v) < (len))					\
		errx(EX_DATAERR, "Rule too long");		\
	} while (0)
/*
 * Check if we have enough space in cmd buffer. Note that since
 * first 8? u32 words are reserved by reserved header, full cmd
 * buffer can't be used, so we need to protect from buffer overrun
 * only. At the beginning, cblen is less than actual buffer size by
 * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need
 * for checking small instructions fitting in given range.
 * We also (ab)use the fact that ipfw_insn is always the first field
 * for any custom instruction.
 */
#define	CHECK_CMDLEN	CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd))

#define GET_UINT_ARG(arg, min, max, tok, s_x) do {			\
	if (!av[0])							\
		errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
	if (_substrcmp(*av, "tablearg") == 0) {				\
		arg = IP_FW_TARG;					\
		break;							\
	}								\
									\
	{								\
	long _xval;							\
	char *end;							\
									\
	_xval = strtol(*av, &end, 10);					\
									\
	if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
		errx(EX_DATAERR, "%s: invalid argument: %s",		\
		    match_value(s_x, tok), *av);			\
									\
	if (errno == ERANGE || _xval < min || _xval > max)		\
		errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
		    match_value(s_x, tok), min, max, *av);		\
									\
	if (_xval == IP_FW_TARG)					\
		errx(EX_DATAERR, "%s: illegal argument value: %s",	\
		    match_value(s_x, tok), *av);			\
	arg = _xval;							\
	}								\
} while (0)

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_ECN_CE},
	{ "ecntransport", IPTOS_ECN_ECT0},
	{ "ip tos option", 0},
	{ NULL,	0 }
};

static struct _s_x f_ipoff[] = {
	{ "rf", IP_RF >> 8 },
	{ "df", IP_DF >> 8 },
	{ "mf", IP_MF >> 8 },
	{ "offset", 0x1 },
	{ NULL, 0}
};

struct _s_x f_ipdscp[] = {
	{ "af11", IPTOS_DSCP_AF11 >> 2 },	/* 001010 */
	{ "af12", IPTOS_DSCP_AF12 >> 2 },	/* 001100 */
	{ "af13", IPTOS_DSCP_AF13 >> 2 },	/* 001110 */
	{ "af21", IPTOS_DSCP_AF21 >> 2 },	/* 010010 */
	{ "af22", IPTOS_DSCP_AF22 >> 2 },	/* 010100 */
	{ "af23", IPTOS_DSCP_AF23 >> 2 },	/* 010110 */
	{ "af31", IPTOS_DSCP_AF31 >> 2 },	/* 011010 */
	{ "af32", IPTOS_DSCP_AF32 >> 2 },	/* 011100 */
	{ "af33", IPTOS_DSCP_AF33 >> 2 },	/* 011110 */
	{ "af41", IPTOS_DSCP_AF41 >> 2 },	/* 100010 */
	{ "af42", IPTOS_DSCP_AF42 >> 2 },	/* 100100 */
	{ "af43", IPTOS_DSCP_AF43 >> 2 },	/* 100110 */
	{ "be", IPTOS_DSCP_CS0 >> 2 }, 	/* 000000 */
	{ "ef", IPTOS_DSCP_EF >> 2 },	/* 101110 */
	{ "cs0", IPTOS_DSCP_CS0 >> 2 },	/* 000000 */
	{ "cs1", IPTOS_DSCP_CS1 >> 2 },	/* 001000 */
	{ "cs2", IPTOS_DSCP_CS2 >> 2 },	/* 010000 */
	{ "cs3", IPTOS_DSCP_CS3 >> 2 },	/* 011000 */
	{ "cs4", IPTOS_DSCP_CS4 >> 2 },	/* 100000 */
	{ "cs5", IPTOS_DSCP_CS5 >> 2 },	/* 101000 */
	{ "cs6", IPTOS_DSCP_CS6 >> 2 },	/* 110000 */
	{ "cs7", IPTOS_DSCP_CS7 >> 2 },	/* 100000 */
	{ 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