d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
165236a101
freebsd-skq/sbin/ipfw/ipfw2.c
Mark Johnston 165236a101 ipfw(8): Handle unaligned pointers in pr_u64. 
struct _ipfw_dyn_rule is defined as packed, and as a result, its
uint64_t fields are misaligned on some 32-bit platforms.  Since
pr_u64() is explicitly supposed to handle this case, avoid using a
uint64_t * for the input pointer to make sure that the compiler won't
(correctly) warn about the misalignment.

Reported by:	jenkins
MFC with:	r363164
2020-07-13 19:10:16 +00:00

5632 lines
130 KiB
C
Raw Blame History

/*-
* 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 }
};
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
* 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 struct _s_x rule_eactions[] = {
{ "nat64clat", TOK_NAT64CLAT },
{ "nat64lsn", TOK_NAT64LSN },
{ "nat64stl", TOK_NAT64STL },
{ "nptv6", TOK_NPTV6 },
{ "tcp-setmss", TOK_TCPSETMSS },
{ NULL, 0 } /* terminator */
};
static struct _s_x rule_actions[] = {
{ "abort6", TOK_ABORT6 },
{ "abort", TOK_ABORT },
{ "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 },
{ "netgraph", TOK_NETGRAPH },
{ "ngtee", TOK_NGTEE },
{ "fwd", TOK_FORWARD },
{ "forward", TOK_FORWARD },
{ "skipto", TOK_SKIPTO },
{ "deny", TOK_DENY },
{ "drop", TOK_DENY },
{ "reject", TOK_REJECT },
{ "reset6", TOK_RESET6 },
{ "reset", TOK_RESET },
{ "unreach6", TOK_UNREACH6 },
{ "unreach", TOK_UNREACH },
{ "check-state", TOK_CHECKSTATE },
{ "//", TOK_COMMENT },
{ "nat", TOK_NAT },
{ "reass", TOK_REASS },
{ "setfib", TOK_SETFIB },
{ "setdscp", TOK_SETDSCP },
{ "call", TOK_CALL },
{ "return", TOK_RETURN },
{ "eaction", TOK_EACTION },
{ "tcp-setmss", TOK_TCPSETMSS },
{ NULL, 0 } /* terminator */
};
static struct _s_x rule_action_params[] = {
{ "altq", TOK_ALTQ },
{ "log", TOK_LOG },
{ "tag", TOK_TAG },
{ "untag", TOK_UNTAG },
{ NULL, 0 } /* terminator */
};
/*
* The 'lookup' instruction accepts one of the following arguments.
* -1 is a terminator for the list.
* Arguments are passed as v[1] in O_DST_LOOKUP options.
*/
static int lookup_key[] = {
TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
static struct _s_x rule_options[] = {
{ "tagged", TOK_TAGGED },
{ "uid", TOK_UID },
{ "gid", TOK_GID },
{ "jail", TOK_JAIL },
{ "in", TOK_IN },
{ "limit", TOK_LIMIT },
{ "set-limit", TOK_SETLIMIT },
{ "keep-state", TOK_KEEPSTATE },
{ "record-state", TOK_RECORDSTATE },
{ "bridged", TOK_LAYER2 },
{ "layer2", TOK_LAYER2 },
{ "out", TOK_OUT },
{ "diverted", TOK_DIVERTED },
{ "diverted-loopback", TOK_DIVERTEDLOOPBACK },
{ "diverted-output", TOK_DIVERTEDOUTPUT },
{ "xmit", TOK_XMIT },
{ "recv", TOK_RECV },
{ "via", TOK_VIA },
{ "fragment", TOK_FRAG },
{ "frag", TOK_FRAG },
{ "fib", TOK_FIB },
{ "ipoptions", TOK_IPOPTS },
{ "ipopts", TOK_IPOPTS },
{ "iplen", TOK_IPLEN },
{ "ipid", TOK_IPID },
{ "ipprecedence", TOK_IPPRECEDENCE },
{ "dscp", TOK_DSCP },
{ "iptos", TOK_IPTOS },
{ "ipttl", TOK_IPTTL },
{ "ipversion", TOK_IPVER },
{ "ipver", TOK_IPVER },
{ "estab", TOK_ESTAB },
{ "established", TOK_ESTAB },
{ "setup", TOK_SETUP },
{ "sockarg", TOK_SOCKARG },
{ "tcpdatalen", TOK_TCPDATALEN },
{ "tcpflags", TOK_TCPFLAGS },
{ "tcpflgs", TOK_TCPFLAGS },
{ "tcpmss", TOK_TCPMSS },
{ "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 },
{ "versrcreach", TOK_VERSRCREACH },
{ "antispoof", TOK_ANTISPOOF },
{ "ipsec", TOK_IPSEC },
{ "icmp6type", TOK_ICMP6TYPES },
{ "icmp6types", TOK_ICMP6TYPES },
{ "ext6hdr", TOK_EXT6HDR},
{ "flow-id", TOK_FLOWID},
{ "ipv6", TOK_IPV6},
{ "ip6", TOK_IPV6},
{ "ipv4", TOK_IPV4},
{ "ip4", TOK_IPV4},
{ "dst-ipv6", TOK_DSTIP6},
{ "dst-ip6", TOK_DSTIP6},
{ "src-ipv6", TOK_SRCIP6},
{ "src-ip6", TOK_SRCIP6},
{ "lookup", TOK_LOOKUP},
{ "flow", TOK_FLOW},
{ "defer-action", TOK_SKIPACTION },
{ "defer-immediate-action", TOK_SKIPACTION },
{ "//", TOK_COMMENT },
{ "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, 0 } /* terminator */
};
void bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg);
static int ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo,
ipfw_cfg_lheader **pcfg, size_t *psize);
static int ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo,
ipfw_cfg_lheader *cfg, size_t sz, int ac, char **av);
static void ipfw_list_tifaces(void);
struct tidx;
static uint16_t pack_object(struct tidx *tstate, const char *name, int otype);
static uint16_t pack_table(struct tidx *tstate, const char *name);
static char *table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx);
static void object_sort_ctlv(ipfw_obj_ctlv *ctlv);
static char *object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx,
uint16_t type);
/*
* Simple string buffer API.
* Used to simplify buffer passing between function and for
* transparent overrun handling.
*/
/*
* Allocates new buffer of given size @sz.
*
* Returns 0 on success.
*/
int
bp_alloc(struct buf_pr *b, size_t size)
{
memset(b, 0, sizeof(struct buf_pr));
if ((b->buf = calloc(1, size)) == NULL)
return (ENOMEM);
b->ptr = b->buf;
b->size = size;
b->avail = b->size;
return (0);
}
void
bp_free(struct buf_pr *b)
{
free(b->buf);
}
/*
* Flushes buffer so new writer start from beginning.
*/
void
bp_flush(struct buf_pr *b)
{
b->ptr = b->buf;
b->avail = b->size;
b->buf[0] = '\0';
}
/*
* Print message specified by @format and args.
* Automatically manage buffer space and transparently handle
* buffer overruns.
*
* Returns number of bytes that should have been printed.
*/
int
bprintf(struct buf_pr *b, const char *format, ...)
{
va_list args;
int i;
va_start(args, format);
i = vsnprintf(b->ptr, b->avail, format, args);
va_end(args);
if (i < 0 || (size_t)i > b->avail) {
/* Overflow or print error */
b->avail = 0;
} else {
b->ptr += i;
b->avail -= i;
}
b->needed += i;
return (i);
}
/*
* Special values printer for tablearg-aware opcodes.
*/
void
bprint_uint_arg(struct buf_pr *bp, const char *str, uint32_t arg)
{
if (str != NULL)
bprintf(bp, "%s", str);
if (arg == IP_FW_TARG)
bprintf(bp, "tablearg");
else
bprintf(bp, "%u", arg);
}
/*
* Helper routine to print a possibly unaligned uint64_t on
* various platform. If width > 0, print the value with
* the desired width, followed by a space;
* otherwise, return the required width.
*/
int
pr_u64(struct buf_pr *b, void *pd, int width)
{
#ifdef TCC
#define U64_FMT "I64"
#else
#define U64_FMT "llu"
#endif
uint64_t u;
unsigned long long d;
bcopy (pd, &u, sizeof(u));
d = u;
return (width > 0) ?
bprintf(b, "%*" U64_FMT " ", width, d) :
snprintf(NULL, 0, "%" U64_FMT, d) ;
#undef U64_FMT
}
void *
safe_calloc(size_t number, size_t size)
{
void *ret = calloc(number, size);
if (ret == NULL)
err(EX_OSERR, "calloc");
return ret;
}
void *
safe_realloc(void *ptr, size_t size)
{
void *ret = realloc(ptr, size);
if (ret == NULL)
err(EX_OSERR, "realloc");
return ret;
}
/*
* Compare things like interface or table names.
*/
int
stringnum_cmp(const char *a, const char *b)
{
int la, lb;
la = strlen(a);
lb = strlen(b);
if (la > lb)
return (1);
else if (la < lb)
return (-01);
return (strcmp(a, b));
}
/*
* conditionally runs the command.
* Selected options or negative -> getsockopt
*/
int
do_cmd(int optname, void *optval, uintptr_t optlen)
{
int i;
if (g_co.test_only)
return 0;
if (ipfw_socket == -1)
ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
if (ipfw_socket < 0)
err(EX_UNAVAILABLE, "socket");
if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
optname == IP_FW_ADD || optname == IP_FW3 ||
optname == IP_FW_NAT_GET_CONFIG ||
optname < 0 ||
optname == IP_FW_NAT_GET_LOG) {
if (optname < 0)
optname = -optname;
i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval,
(socklen_t *)optlen);
} else {
i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen);
}
return i;
}
/*
* do_set3 - pass ipfw control cmd to kernel
* @optname: option name
* @optval: pointer to option data
* @optlen: option length
*
* Assumes op3 header is already embedded.
* Calls setsockopt() with IP_FW3 as kernel-visible opcode.
* Returns 0 on success or errno otherwise.
*/
int
do_set3(int optname, ip_fw3_opheader *op3, size_t optlen)
{
if (g_co.test_only)
return (0);
if (ipfw_socket == -1)
ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
if (ipfw_socket < 0)
err(EX_UNAVAILABLE, "socket");
op3->opcode = optname;
return (setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, optlen));
}
/*
* do_get3 - pass ipfw control cmd to kernel
* @optname: option name
* @optval: pointer to option data
* @optlen: pointer to option length
*
* Assumes op3 header is already embedded.
* Calls getsockopt() with IP_FW3 as kernel-visible opcode.
* Returns 0 on success or errno otherwise.
*/
int
do_get3(int optname, ip_fw3_opheader *op3, size_t *optlen)
{
int error;
socklen_t len;
if (g_co.test_only)
return (0);
if (ipfw_socket == -1)
ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
if (ipfw_socket < 0)
err(EX_UNAVAILABLE, "socket");
op3->opcode = optname;
len = *optlen;
error = getsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, &len);
*optlen = len;
return (error);
}
/**
* match_token takes a table and a string, returns the value associated
* with the string (-1 in case of failure).
*/
int
match_token(struct _s_x *table, const char *string)
{
struct _s_x *pt;
uint 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);
}
/**
* match_token_relaxed takes a table and a string, returns the value associated
* with the string for the best match.
*
* Returns:
* value from @table for matched records
* -1 for non-matched records
* -2 if more than one records match @string.
*/
int
match_token_relaxed(struct _s_x *table, const char *string)
{
struct _s_x *pt, *m;
int i, c;
i = strlen(string);
c = 0;
for (pt = table ; i != 0 && pt->s != NULL ; pt++) {
if (strncmp(pt->s, string, i) != 0)
continue;
m = pt;
c++;
}
if (c == 1)
return (m->x);
return (c > 0 ? -2: -1);
}
int
get_token(struct _s_x *table, const char *string, const char *errbase)
{
int tcmd;
if ((tcmd = match_token_relaxed(table, string)) < 0)
errx(EX_USAGE, "%s %s %s",
(tcmd == 0) ? "invalid" : "ambiguous", errbase, string);
return (tcmd);
}
/**
* match_value takes a table and a value, returns the string associated
* with the value (NULL in case of failure).
*/
char const *
match_value(struct _s_x *p, int value)
{
for (; p->s != NULL; p++)
if (p->x == value)
return p->s;
return NULL;
}
size_t
concat_tokens(char *buf, size_t bufsize, struct _s_x *table,
const char *delimiter)
{
struct _s_x *pt;
int l;
size_t sz;
for (sz = 0, pt = table ; pt->s != NULL; pt++) {
l = snprintf(buf + sz, bufsize - sz, "%s%s",
(sz == 0) ? "" : delimiter, pt->s);
sz += l;
bufsize += l;
if (sz > bufsize)
return (bufsize);
}
return (sz);
}
/*
* helper function to process a set of flags and set bits in the
* appropriate masks.
*/
int
fill_flags(struct _s_x *flags, char *p, char **e, uint32_t *set,
uint32_t *clear)
{
char *q; /* points to the separator */
int val;
uint32_t *which; /* mask we are working on */
while (p && *p) {
if (*p == '!') {
p++;
which = clear;
} else
which = set;
q = strchr(p, ',');
if (q)
*q++ = '\0';
val = match_token(flags, p);
if (val <= 0) {
if (e != NULL)
*e = p;
return (-1);
}
*which |= (uint32_t)val;
p = q;
}
return (0);
}
void
print_flags_buffer(char *buf, size_t sz, struct _s_x *list, uint32_t set)
{
char const *comma = "";
int i, l;
for (i = 0; list[i].x != 0; i++) {
if ((set & list[i].x) == 0)
continue;
set &= ~list[i].x;
l = snprintf(buf, sz, "%s%s", comma, list[i].s);
if (l < 0 || (size_t)l >= sz)
return;
comma = ",";
buf += l;
sz -=l;
}
}
/*
* _substrcmp takes two strings and returns 1 if they do not match,
* and 0 if they match exactly or the first string is a sub-string
* of the second. A warning is printed to stderr in the case that the
* first string is a sub-string of the second.
*
* This function will be removed in the future through the usual
* deprecation process.
*/
int
_substrcmp(const char *str1, const char* str2)
{
if (strncmp(str1, str2, strlen(str1)) != 0)
return 1;
if (strlen(str1) != strlen(str2))
warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
str1, str2);
return 0;
}
/*
* _substrcmp2 takes three strings and returns 1 if the first two do not match,
* and 0 if they match exactly or the second string is a sub-string
* of the first. A warning is printed to stderr in the case that the
* first string does not match the third.
*
* This function exists to warn about the bizarre construction
* strncmp(str, "by", 2) which is used to allow people to use a shortcut
* for "bytes". The problem is that in addition to accepting "by",
* "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
* other string beginning with "by".
*
* This function will be removed in the future through the usual
* deprecation process.
*/
int
_substrcmp2(const char *str1, const char* str2, const char* str3)
{
if (strncmp(str1, str2, strlen(str2)) != 0)
return 1;
if (strcmp(str1, str3) != 0)
warnx("DEPRECATED: '%s' matched '%s'",
str1, str3);
return 0;
}
/*
* prints one port, symbolic or numeric
*/
static void
print_port(struct buf_pr *bp, int proto, uint16_t port)
{
if (proto == IPPROTO_ETHERTYPE) {
char const *s;
if (g_co.do_resolv && (s = match_value(ether_types, port)) )
bprintf(bp, "%s", s);
else
bprintf(bp, "0x%04x", port);
} else {
struct servent *se = NULL;
if (g_co.do_resolv) {
struct protoent *pe = getprotobynumber(proto);
se = getservbyport(htons(port), pe ? pe->p_name : NULL);
}
if (se)
bprintf(bp, "%s", se->s_name);
else
bprintf(bp, "%d", port);
}
}
static struct _s_x _port_name[] = {
{"dst-port", O_IP_DSTPORT},
{"src-port", O_IP_SRCPORT},
{"ipid", O_IPID},
{"iplen", O_IPLEN},
{"ipttl", O_IPTTL},
{"mac-type", O_MAC_TYPE},
{"tcpdatalen", O_TCPDATALEN},
{"tcpmss", O_TCPMSS},
{"tcpwin", O_TCPWIN},
{"tagged", O_TAGGED},
{NULL, 0}
};
/*
* Print the values in a list 16-bit items of the types above.
* XXX todo: add support for mask.
*/
static void
print_newports(struct buf_pr *bp, const ipfw_insn_u16 *cmd, int proto, int opcode)
{
const uint16_t *p = cmd->ports;
int i;
char const *sep;
if (opcode != 0) {
sep = match_value(_port_name, opcode);
if (sep == NULL)
sep = "???";
bprintf(bp, " %s", sep);
}
sep = " ";
for (i = F_LEN((const ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
bprintf(bp, "%s", sep);
print_port(bp, proto, p[0]);
if (p[0] != p[1]) {
bprintf(bp, "-");
print_port(bp, 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 == '_' || *s1 == '.') ; s1++)
if (*s1 == '\\' && s1[1] != '\0')
s1++;
buf = safe_calloc(s1 - s + 1, 1);
/*
* 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.
*/
static int
fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen)
{
uint16_t a, b, *p = cmd->ports;
int i = 0;
char *s = av;
while (*s) {
a = strtoport(av, &s, 0, proto);
if (s == av) /* empty or invalid argument */
return (0);
CHECK_LENGTH(cblen, i + 2);
switch (*s) {
case '-': /* a range */
av = s + 1;
b = strtoport(av, &s, 0, proto);
/* Reject expressions like '1-abc' or '1-2-3'. */
if (s == av || (*s != ',' && *s != '\0'))
return (0);
p[0] = a;
p[1] = b;
break;
case ',': /* comma separated list */
case '\0':
p[0] = p[1] = a;
break;
default:
warnx("port list: invalid separator <%c> in <%s>",
*s, av);
return (0);
}
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);
}
/*
* Fill the body of the command with the list of DiffServ codepoints.
*/
static void
fill_dscp(ipfw_insn *cmd, char *av, int cblen)
{
uint32_t *low, *high;
char *s = av, *a;
int code;
cmd->opcode = O_DSCP;
cmd->len |= F_INSN_SIZE(ipfw_insn_u32) + 1;
CHECK_CMDLEN;
low = (uint32_t *)(cmd + 1);
high = low + 1;
*low = 0;
*high = 0;
while (s != NULL) {
a = strchr(s, ',');
if (a != NULL)
*a++ = '\0';
if (isalpha(*s)) {
if ((code = match_token(f_ipdscp, s)) == -1)
errx(EX_DATAERR, "Unknown DSCP code");
} else {
code = strtoul(s, NULL, 10);
if (code < 0 || code > 63)
errx(EX_DATAERR, "Invalid DSCP value");
}
if (code >= 32)
*high |= 1 << (code - 32);
else
*low |= 1 << code;
s = a;
}
}
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(struct buf_pr *bp, uint16_t code)
{
char const *s;
if ((s = match_value(icmpcodes, code)) != NULL)
bprintf(bp, "unreach %s", s);
else
bprintf(bp, "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.
*/
int
contigmask(const uint8_t *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(struct buf_pr *bp, char const *name, const ipfw_insn *cmd,
struct _s_x *list)
{
char const *comma = "";
int i;
uint8_t set = cmd->arg1 & 0xff;
uint8_t clear = (cmd->arg1 >> 8) & 0xff;
if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
bprintf(bp, " setup");
return;
}
bprintf(bp, " %s ", name);
for (i=0; list[i].x != 0; i++) {
if (set & list[i].x) {
set &= ~list[i].x;
bprintf(bp, "%s%s", comma, list[i].s);
comma = ",";
}
if (clear & list[i].x) {
clear &= ~list[i].x;
bprintf(bp, "%s!%s", comma, list[i].s);
comma = ",";
}
}
}
/*
* Print the ip address contained in a command.
*/
static void
print_ip(struct buf_pr *bp, const struct format_opts *fo,
const ipfw_insn_ip *cmd)
{
struct hostent *he = NULL;
const struct in_addr *ia;
const uint32_t *a = ((const ipfw_insn_u32 *)cmd)->d;
uint32_t len = F_LEN((const ipfw_insn *)cmd);
char *t;
bprintf(bp, " ");
if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
uint32_t d = a[1];
const char *arg = "<invalid>";
if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
arg = match_value(rule_options, lookup_key[d]);
t = table_search_ctlv(fo->tstate,
((const ipfw_insn *)cmd)->arg1);
bprintf(bp, "lookup %s %s", arg, t);
return;
}
if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
bprintf(bp, "me");
return;
}
if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
cmd->o.opcode == O_IP_DST_LOOKUP) {
t = table_search_ctlv(fo->tstate,
((const ipfw_insn *)cmd)->arg1);
bprintf(bp, "table(%s", t);
if (len == F_INSN_SIZE(ipfw_insn_u32))
bprintf(bp, ",%u", *a);
bprintf(bp, ")");
return;
}
if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
const uint32_t *map = (const uint32_t *)&cmd->mask;
struct in_addr addr;
uint32_t x;
int i, j;
char comma = '{';
x = cmd->o.arg1 - 1;
x = htonl(~x);
addr.s_addr = htonl(cmd->addr.s_addr);
bprintf(bp, "%s/%d", inet_ntoa(addr),
contigmask((uint8_t *)&x, 32));
x = cmd->addr.s_addr;
x &= 0xff; /* base */
/*
* 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 (map[i/32] & (1<<(i & 31))) {
for (j=i+1; j < cmd->o.arg1; j++)
if (!(map[ j/32] & (1<<(j & 31))))
break;
bprintf(bp, "%c%d", comma, i+x);
if (j>i+2) { /* range has at least 3 elements */
bprintf(bp, "-%d", j-1+x);
i = j-1;
}
comma = ',';
}
bprintf(bp, "}");
return;
}
/*
* len == 2 indicates a single IP, whereas lists of 1 or more
* addr/mask pairs have len = (2n+1). We convert len to n so we
* use that to count the number of entries.
*/
for (len = len / 2; len > 0; len--, a += 2) {
int mb = /* mask length */
(cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
32 : contigmask((const uint8_t *)&(a[1]), 32);
if (mb == 32 && g_co.do_resolv)
he = gethostbyaddr((const char *)&(a[0]), sizeof(in_addr_t),
AF_INET);
if (he != NULL) /* resolved to name */
bprintf(bp, "%s", he->h_name);
else if (mb == 0) /* any */
bprintf(bp, "any");
else { /* numeric IP followed by some kind of mask */
ia = (const struct in_addr *)&a[0];
bprintf(bp, "%s", inet_ntoa(*ia));
if (mb < 0) {
ia = (const struct in_addr *)&a[1];
bprintf(bp, ":%s", inet_ntoa(*ia));
} else if (mb < 32)
bprintf(bp, "/%d", mb);
}
if (len > 1)
bprintf(bp, ",");
}
}
/*
* prints a MAC address/mask pair
*/
static void
format_mac(struct buf_pr *bp, const uint8_t *addr, const uint8_t *mask)
{
int l = contigmask(mask, 48);
if (l == 0)
bprintf(bp, " any");
else {
bprintf(bp, " %02x:%02x:%02x:%02x:%02x:%02x",
addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
if (l == -1)
bprintf(bp, "&%02x:%02x:%02x:%02x:%02x:%02x",
mask[0], mask[1], mask[2],
mask[3], mask[4], mask[5]);
else if (l < 48)
bprintf(bp, "/%d", l);
}
}
static void
print_mac(struct buf_pr *bp, const ipfw_insn_mac *mac)
{
bprintf(bp, " MAC");
format_mac(bp, mac->addr, mac->mask);
format_mac(bp, mac->addr + 6, mac->mask + 6);
}
static void
fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
{
uint8_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(struct buf_pr *bp, const ipfw_insn_u32 *cmd)
{
int i;
char sep= ' ';
bprintf(bp, " icmptypes");
for (i = 0; i < 32; i++) {
if ( (cmd->d[0] & (1 << (i))) == 0)
continue;
bprintf(bp, "%c%d", sep, i);
sep = ',';
}
}
static void
print_dscp(struct buf_pr *bp, const ipfw_insn_u32 *cmd)
{
const uint32_t *v;
const char *code;
int i = 0;
char sep= ' ';
bprintf(bp, " dscp");
v = cmd->d;
while (i < 64) {
if (*v & (1 << i)) {
if ((code = match_value(f_ipdscp, i)) != NULL)
bprintf(bp, "%c%s", sep, code);
else
bprintf(bp, "%c%d", sep, i);
sep = ',';
}
if ((++i % 32) == 0)
v++;
}
}
#define insntod(cmd, type) ((const ipfw_insn_ ## type *)(cmd))
struct show_state {
struct ip_fw_rule *rule;
const ipfw_insn *eaction;
uint8_t *printed;
int flags;
#define HAVE_PROTO 0x0001
#define HAVE_SRCIP 0x0002
#define HAVE_DSTIP 0x0004
#define HAVE_PROBE_STATE 0x0008
int proto;
int or_block;
};
static int
init_show_state(struct show_state *state, struct ip_fw_rule *rule)
{
state->printed = calloc(rule->cmd_len, sizeof(uint8_t));
if (state->printed == NULL)
return (ENOMEM);
state->rule = rule;
state->eaction = NULL;
state->flags = 0;
state->proto = 0;
state->or_block = 0;
return (0);
}
static void
free_show_state(struct show_state *state)
{
free(state->printed);
}
static uint8_t
is_printed_opcode(struct show_state *state, const ipfw_insn *cmd)
{
return (state->printed[cmd - state->rule->cmd]);
}
static void
mark_printed(struct show_state *state, const ipfw_insn *cmd)
{
state->printed[cmd - state->rule->cmd] = 1;
}
static void
print_limit_mask(struct buf_pr *bp, const ipfw_insn_limit *limit)
{
struct _s_x *p = limit_masks;
char const *comma = " ";
uint8_t x;
for (x = limit->limit_mask; p->x != 0; p++) {
if ((x & p->x) == p->x) {
x &= ~p->x;
bprintf(bp, "%s%s", comma, p->s);
comma = ",";
}
}
bprint_uint_arg(bp, " ", limit->conn_limit);
}
static int
print_instruction(struct buf_pr *bp, const struct format_opts *fo,
struct show_state *state, const ipfw_insn *cmd)
{
struct protoent *pe;
struct passwd *pwd;
struct group *grp;
const char *s;
double d;
if (is_printed_opcode(state, cmd))
return (0);
if ((cmd->len & F_OR) != 0 && state->or_block == 0)
bprintf(bp, " {");
if (cmd->opcode != O_IN && (cmd->len & F_NOT) != 0)
bprintf(bp, " not");
switch (cmd->opcode) {
case O_PROB:
d = 1.0 * insntod(cmd, u32)->d[0] / 0x7fffffff;
bprintf(bp, "prob %f ", d);
break;
case O_PROBE_STATE: /* no need to print anything here */
state->flags |= HAVE_PROBE_STATE;
break;
case O_IP_SRC:
case O_IP_SRC_LOOKUP:
case O_IP_SRC_MASK:
case O_IP_SRC_ME:
case O_IP_SRC_SET:
if (state->flags & HAVE_SRCIP)
bprintf(bp, " src-ip");
print_ip(bp, fo, insntod(cmd, ip));
break;
case O_IP_DST:
case O_IP_DST_LOOKUP:
case O_IP_DST_MASK:
case O_IP_DST_ME:
case O_IP_DST_SET:
if (state->flags & HAVE_DSTIP)
bprintf(bp, " dst-ip");
print_ip(bp, fo, insntod(cmd, ip));
break;
case O_IP6_SRC:
case O_IP6_SRC_MASK:
case O_IP6_SRC_ME:
if (state->flags & HAVE_SRCIP)
bprintf(bp, " src-ip6");
print_ip6(bp, insntod(cmd, ip6));
break;
case O_IP6_DST:
case O_IP6_DST_MASK:
case O_IP6_DST_ME:
if (state->flags & HAVE_DSTIP)
bprintf(bp, " dst-ip6");
print_ip6(bp, insntod(cmd, ip6));
break;
case O_FLOW6ID:
print_flow6id(bp, insntod(cmd, u32));
break;
case O_IP_DSTPORT:
case O_IP_SRCPORT:
print_newports(bp, insntod(cmd, u16), state->proto,
(state->flags & (HAVE_SRCIP | HAVE_DSTIP)) ==
(HAVE_SRCIP | HAVE_DSTIP) ? cmd->opcode: 0);
break;
case O_PROTO:
pe = getprotobynumber(cmd->arg1);
if (state->flags & HAVE_PROTO)
bprintf(bp, " proto");
if (pe != NULL)
bprintf(bp, " %s", pe->p_name);
else
bprintf(bp, " %u", cmd->arg1);
state->proto = cmd->arg1;
break;
case O_MACADDR2:
print_mac(bp, insntod(cmd, mac));
break;
case O_MAC_TYPE:
print_newports(bp, insntod(cmd, u16),
IPPROTO_ETHERTYPE, cmd->opcode);
break;
case O_FRAG:
bprintf(bp, " frag");
break;
case O_FIB:
bprintf(bp, " fib %u", cmd->arg1);
break;
case O_SOCKARG:
bprintf(bp, " sockarg");
break;
case O_IN:
bprintf(bp, cmd->len & F_NOT ? " out" : " in");
break;
case O_DIVERTED:
switch (cmd->arg1) {
case 3:
bprintf(bp, " diverted");
break;
case 2:
bprintf(bp, " diverted-output");
break;
case 1:
bprintf(bp, " diverted-loopback");
break;
default:
bprintf(bp, " diverted-?<%u>", cmd->arg1);
break;
}
break;
case O_LAYER2:
bprintf(bp, " layer2");
break;
case O_XMIT:
case O_RECV:
case O_VIA:
if (cmd->opcode == O_XMIT)
s = "xmit";
else if (cmd->opcode == O_RECV)
s = "recv";
else /* if (cmd->opcode == O_VIA) */
s = "via";
switch (insntod(cmd, if)->name[0]) {
case '\0':
bprintf(bp, " %s %s", s,
inet_ntoa(insntod(cmd, if)->p.ip));
break;
case '\1':
bprintf(bp, " %s table(%s)", s,
table_search_ctlv(fo->tstate,
insntod(cmd, if)->p.kidx));
break;
default:
bprintf(bp, " %s %s", s,
insntod(cmd, if)->name);
}
break;
case O_IP_FLOW_LOOKUP:
s = table_search_ctlv(fo->tstate, cmd->arg1);
bprintf(bp, " flow table(%s", s);
if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))
bprintf(bp, ",%u", insntod(cmd, u32)->d[0]);
bprintf(bp, ")");
break;
case O_IPID:
case O_IPTTL:
case O_IPLEN:
case O_TCPDATALEN:
case O_TCPMSS:
case O_TCPWIN:
if (F_LEN(cmd) == 1) {
switch (cmd->opcode) {
case O_IPID:
s = "ipid";
break;
case O_IPTTL:
s = "ipttl";
break;
case O_IPLEN:
s = "iplen";
break;
case O_TCPDATALEN:
s = "tcpdatalen";
break;
case O_TCPMSS:
s = "tcpmss";
break;
case O_TCPWIN:
s = "tcpwin";
break;
}
bprintf(bp, " %s %u", s, cmd->arg1);
} else
print_newports(bp, insntod(cmd, u16), 0,
cmd->opcode);
break;
case O_IPVER:
bprintf(bp, " ipver %u", cmd->arg1);
break;
case O_IPPRECEDENCE:
bprintf(bp, " ipprecedence %u", cmd->arg1 >> 5);
break;
case O_DSCP:
print_dscp(bp, insntod(cmd, u32));
break;
case O_IPOPT:
print_flags(bp, "ipoptions", cmd, f_ipopts);
break;
case O_IPTOS:
print_flags(bp, "iptos", cmd, f_iptos);
break;
case O_ICMPTYPE:
print_icmptypes(bp, insntod(cmd, u32));
break;
case O_ESTAB:
bprintf(bp, " established");
break;
case O_TCPFLAGS:
print_flags(bp, "tcpflags", cmd, f_tcpflags);
break;
case O_TCPOPTS:
print_flags(bp, "tcpoptions", cmd, f_tcpopts);
break;
case O_TCPACK:
bprintf(bp, " tcpack %d",
ntohl(insntod(cmd, u32)->d[0]));
break;
case O_TCPSEQ:
bprintf(bp, " tcpseq %d",
ntohl(insntod(cmd, u32)->d[0]));
break;
case O_UID:
pwd = getpwuid(insntod(cmd, u32)->d[0]);
if (pwd != NULL)
bprintf(bp, " uid %s", pwd->pw_name);
else
bprintf(bp, " uid %u",
insntod(cmd, u32)->d[0]);
break;
case O_GID:
grp = getgrgid(insntod(cmd, u32)->d[0]);
if (grp != NULL)
bprintf(bp, " gid %s", grp->gr_name);
else
bprintf(bp, " gid %u",
insntod(cmd, u32)->d[0]);
break;
case O_JAIL:
bprintf(bp, " jail %d", insntod(cmd, u32)->d[0]);
break;
case O_VERREVPATH:
bprintf(bp, " verrevpath");
break;
case O_VERSRCREACH:
bprintf(bp, " versrcreach");
break;
case O_ANTISPOOF:
bprintf(bp, " antispoof");
break;
case O_IPSEC:
bprintf(bp, " ipsec");
break;
case O_NOP:
bprintf(bp, " // %s", (const char *)(cmd + 1));
break;
case O_KEEP_STATE:
if (state->flags & HAVE_PROBE_STATE)
bprintf(bp, " keep-state");
else
bprintf(bp, " record-state");
bprintf(bp, " :%s",
object_search_ctlv(fo->tstate, cmd->arg1,
IPFW_TLV_STATE_NAME));
break;
case O_LIMIT:
if (state->flags & HAVE_PROBE_STATE)
bprintf(bp, " limit");
else
bprintf(bp, " set-limit");
print_limit_mask(bp, insntod(cmd, limit));
bprintf(bp, " :%s",
object_search_ctlv(fo->tstate, cmd->arg1,
IPFW_TLV_STATE_NAME));
break;
case O_IP6:
if (state->flags & HAVE_PROTO)
bprintf(bp, " proto");
bprintf(bp, " ip6");
break;
case O_IP4:
if (state->flags & HAVE_PROTO)
bprintf(bp, " proto");
bprintf(bp, " ip4");
break;
case O_ICMP6TYPE:
print_icmp6types(bp, insntod(cmd, u32));
break;
case O_EXT_HDR:
print_ext6hdr(bp, cmd);
break;
case O_TAGGED:
if (F_LEN(cmd) == 1)
bprint_uint_arg(bp, " tagged ", cmd->arg1);
else
print_newports(bp, insntod(cmd, u16),
0, O_TAGGED);
break;
case O_SKIP_ACTION:
bprintf(bp, " defer-immediate-action");
break;
default:
bprintf(bp, " [opcode %d len %d]", cmd->opcode,
cmd->len);
}
if (cmd->len & F_OR) {
bprintf(bp, " or");
state->or_block = 1;
} else if (state->or_block != 0) {
bprintf(bp, " }");
state->or_block = 0;
}
mark_printed(state, cmd);
return (1);
}
static ipfw_insn *
print_opcode(struct buf_pr *bp, struct format_opts *fo,
struct show_state *state, int opcode)
{
ipfw_insn *cmd;
int l;
for (l = state->rule->act_ofs, cmd = state->rule->cmd;
l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
/* We use zero opcode to print the rest of options */
if (opcode >= 0 && cmd->opcode != opcode)
continue;
/*
* Skip O_NOP, when we printing the rest
* of options, it will be handled separately.
*/
if (cmd->opcode == O_NOP && opcode != O_NOP)
continue;
if (!print_instruction(bp, fo, state, cmd))
continue;
return (cmd);
}
return (NULL);
}
static void
print_fwd(struct buf_pr *bp, const ipfw_insn *cmd)
{
char buf[INET6_ADDRSTRLEN + IF_NAMESIZE + 2];
const ipfw_insn_sa6 *sa6;
const ipfw_insn_sa *sa;
uint16_t port;
if (cmd->opcode == O_FORWARD_IP) {
sa = insntod(cmd, sa);
port = sa->sa.sin_port;
if (sa->sa.sin_addr.s_addr == INADDR_ANY)
bprintf(bp, "fwd tablearg");
else
bprintf(bp, "fwd %s", inet_ntoa(sa->sa.sin_addr));
} else {
sa6 = insntod(cmd, sa6);
port = sa6->sa.sin6_port;
bprintf(bp, "fwd ");
if (getnameinfo((const struct sockaddr *)&sa6->sa,
sizeof(struct sockaddr_in6), buf, sizeof(buf), NULL, 0,
NI_NUMERICHOST) == 0)
bprintf(bp, "%s", buf);
}
if (port != 0)
bprintf(bp, ",%u", port);
}
static int
print_action_instruction(struct buf_pr *bp, const struct format_opts *fo,
struct show_state *state, const ipfw_insn *cmd)
{
const char *s;
if (is_printed_opcode(state, cmd))
return (0);
switch (cmd->opcode) {
case O_CHECK_STATE:
bprintf(bp, "check-state");
if (cmd->arg1 != 0)
s = object_search_ctlv(fo->tstate, cmd->arg1,
IPFW_TLV_STATE_NAME);
else
s = NULL;
bprintf(bp, " :%s", s ? s: "any");
break;
case O_ACCEPT:
bprintf(bp, "allow");
break;
case O_COUNT:
bprintf(bp, "count");
break;
case O_DENY:
bprintf(bp, "deny");
break;
case O_REJECT:
if (cmd->arg1 == ICMP_REJECT_RST)
bprintf(bp, "reset");
else if (cmd->arg1 == ICMP_REJECT_ABORT)
bprintf(bp, "abort");
else if (cmd->arg1 == ICMP_UNREACH_HOST)
bprintf(bp, "reject");
else
print_reject_code(bp, cmd->arg1);
break;
case O_UNREACH6:
if (cmd->arg1 == ICMP6_UNREACH_RST)
bprintf(bp, "reset6");
else if (cmd->arg1 == ICMP6_UNREACH_ABORT)
bprintf(bp, "abort6");
else
print_unreach6_code(bp, cmd->arg1);
break;
case O_SKIPTO:
bprint_uint_arg(bp, "skipto ", cmd->arg1);
break;
case O_PIPE:
bprint_uint_arg(bp, "pipe ", cmd->arg1);
break;
case O_QUEUE:
bprint_uint_arg(bp, "queue ", cmd->arg1);
break;
case O_DIVERT:
bprint_uint_arg(bp, "divert ", cmd->arg1);
break;
case O_TEE:
bprint_uint_arg(bp, "tee ", cmd->arg1);
break;
case O_NETGRAPH:
bprint_uint_arg(bp, "netgraph ", cmd->arg1);
break;
case O_NGTEE:
bprint_uint_arg(bp, "ngtee ", cmd->arg1);
break;
case O_FORWARD_IP:
case O_FORWARD_IP6:
print_fwd(bp, cmd);
break;
case O_LOG:
if (insntod(cmd, log)->max_log > 0)
bprintf(bp, " log logamount %d",
insntod(cmd, log)->max_log);
else
bprintf(bp, " log");
break;
case O_ALTQ:
#ifndef NO_ALTQ
print_altq_cmd(bp, insntod(cmd, altq));
#endif
break;
case O_TAG:
bprint_uint_arg(bp, cmd->len & F_NOT ? " untag ":
" tag ", cmd->arg1);
break;
case O_NAT:
if (cmd->arg1 != IP_FW_NAT44_GLOBAL)
bprint_uint_arg(bp, "nat ", cmd->arg1);
else
bprintf(bp, "nat global");
break;
case O_SETFIB:
if (cmd->arg1 == IP_FW_TARG)
bprint_uint_arg(bp, "setfib ", cmd->arg1);
else
bprintf(bp, "setfib %u", cmd->arg1 & 0x7FFF);
break;
case O_EXTERNAL_ACTION:
/*
* The external action can consists of two following
* each other opcodes - O_EXTERNAL_ACTION and
* O_EXTERNAL_INSTANCE. The first contains the ID of
* name of external action. The second contains the ID
* of name of external action instance.
* NOTE: in case when external action has no named
* instances support, the second opcode isn't needed.
*/
state->eaction = cmd;
s = object_search_ctlv(fo->tstate, cmd->arg1,
IPFW_TLV_EACTION);
if (match_token(rule_eactions, s) != -1)
bprintf(bp, "%s", s);
else
bprintf(bp, "eaction %s", s);
break;
case O_EXTERNAL_INSTANCE:
if (state->eaction == NULL)
break;
/*
* XXX: we need to teach ipfw(9) to rewrite opcodes
* in the user buffer on rule addition. When we add
* the rule, we specify zero TLV type for
* O_EXTERNAL_INSTANCE object. To show correct
* rule after `ipfw add` we need to search instance
* name with zero type. But when we do `ipfw show`
* we calculate TLV type using IPFW_TLV_EACTION_NAME()
* macro.
*/
s = object_search_ctlv(fo->tstate, cmd->arg1, 0);
if (s == NULL)
s = object_search_ctlv(fo->tstate,
cmd->arg1, IPFW_TLV_EACTION_NAME(
state->eaction->arg1));
bprintf(bp, " %s", s);
break;
case O_EXTERNAL_DATA:
if (state->eaction == NULL)
break;
/*
* Currently we support data formatting only for
* external data with datalen u16. For unknown data
* print its size in bytes.
*/
if (cmd->len == F_INSN_SIZE(ipfw_insn))
bprintf(bp, " %u", cmd->arg1);
else
bprintf(bp, " %ubytes",
cmd->len * sizeof(uint32_t));
break;
case O_SETDSCP:
if (cmd->arg1 == IP_FW_TARG) {
bprintf(bp, "setdscp tablearg");
break;
}
s = match_value(f_ipdscp, cmd->arg1 & 0x3F);
if (s != NULL)
bprintf(bp, "setdscp %s", s);
else
bprintf(bp, "setdscp %u", cmd->arg1 & 0x3F);
break;
case O_REASS:
bprintf(bp, "reass");
break;
case O_CALLRETURN:
if (cmd->len & F_NOT)
bprintf(bp, "return");
else
bprint_uint_arg(bp, "call ", cmd->arg1);
break;
default:
bprintf(bp, "** unrecognized action %d len %d ",
cmd->opcode, cmd->len);
}
mark_printed(state, cmd);
return (1);
}
static ipfw_insn *
print_action(struct buf_pr *bp, struct format_opts *fo,
struct show_state *state, uint8_t opcode)
{
ipfw_insn *cmd;
int l;
for (l = state->rule->cmd_len - state->rule->act_ofs,
cmd = ACTION_PTR(state->rule); l > 0;
l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
if (cmd->opcode != opcode)
continue;
if (!print_action_instruction(bp, fo, state, cmd))
continue;
return (cmd);
}
return (NULL);
}
static void
print_proto(struct buf_pr *bp, struct format_opts *fo,
struct show_state *state)
{
ipfw_insn *cmd;
int l, proto, ip4, ip6;
/* Count all O_PROTO, O_IP4, O_IP6 instructions. */
proto = ip4 = ip6 = 0;
for (l = state->rule->act_ofs, cmd = state->rule->cmd;
l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
switch (cmd->opcode) {
case O_PROTO:
proto++;
break;
case O_IP4:
ip4 = 1;
if (cmd->len & F_OR)
ip4++;
break;
case O_IP6:
ip6 = 1;
if (cmd->len & F_OR)
ip6++;
break;
default:
continue;
}
}
if (proto == 0 && ip4 == 0 && ip6 == 0) {
state->proto = IPPROTO_IP;
state->flags |= HAVE_PROTO;
bprintf(bp, " ip");
return;
}
/* To handle the case { ip4 or ip6 }, print opcode with F_OR first */
cmd = NULL;
if (ip4 || ip6)
cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP4: O_IP6);
if (cmd != NULL && (cmd->len & F_OR))
cmd = print_opcode(bp, fo, state, ip4 > ip6 ? O_IP6: O_IP4);
if (cmd == NULL || (cmd->len & F_OR))
for (l = proto; l > 0; l--) {
cmd = print_opcode(bp, fo, state, O_PROTO);
if (cmd == NULL || (cmd->len & F_OR) == 0)
break;
}
/* Initialize proto, it is used by print_newports() */
state->flags |= HAVE_PROTO;
if (state->proto == 0 && ip6 != 0)
state->proto = IPPROTO_IPV6;
}
static int
match_opcode(int opcode, const int opcodes[], size_t nops)
{
size_t i;
for (i = 0; i < nops; i++)
if (opcode == opcodes[i])
return (1);
return (0);
}
static void
print_address(struct buf_pr *bp, struct format_opts *fo,
struct show_state *state, const int opcodes[], size_t nops, int portop,
int flag)
{
ipfw_insn *cmd;
int count, l, portcnt, pf;
count = portcnt = 0;
for (l = state->rule->act_ofs, cmd = state->rule->cmd;
l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
if (match_opcode(cmd->opcode, opcodes, nops))
count++;
else if (cmd->opcode == portop)
portcnt++;
}
if (count == 0)
bprintf(bp, " any");
for (l = state->rule->act_ofs, cmd = state->rule->cmd;
l > 0 && count > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
if (!match_opcode(cmd->opcode, opcodes, nops))
continue;
print_instruction(bp, fo, state, cmd);
if ((cmd->len & F_OR) == 0)
break;
count--;
}
/*
* If several O_IP_?PORT opcodes specified, leave them to the
* options section.
*/
if (portcnt == 1) {
for (l = state->rule->act_ofs, cmd = state->rule->cmd, pf = 0;
l > 0; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
if (cmd->opcode != portop) {
pf = (cmd->len & F_OR);
continue;
}
/* Print opcode iff it is not in OR block. */
if (pf == 0 && (cmd->len & F_OR) == 0)
print_instruction(bp, fo, state, cmd);
break;
}
}
state->flags |= flag;
}
static const int action_opcodes[] = {
O_CHECK_STATE, O_ACCEPT, O_COUNT, O_DENY, O_REJECT,
O_UNREACH6, O_SKIPTO, O_PIPE, O_QUEUE, O_DIVERT, O_TEE,
O_NETGRAPH, O_NGTEE, O_FORWARD_IP, O_FORWARD_IP6, O_NAT,
O_SETFIB, O_SETDSCP, O_REASS, O_CALLRETURN,
/* keep the following opcodes at the end of the list */
O_EXTERNAL_ACTION, O_EXTERNAL_INSTANCE, O_EXTERNAL_DATA
};
static const int modifier_opcodes[] = {
O_LOG, O_ALTQ, O_TAG
};
static const int src_opcodes[] = {
O_IP_SRC, O_IP_SRC_LOOKUP, O_IP_SRC_MASK, O_IP_SRC_ME,
O_IP_SRC_SET, O_IP6_SRC, O_IP6_SRC_MASK, O_IP6_SRC_ME
};
static const int dst_opcodes[] = {
O_IP_DST, O_IP_DST_LOOKUP, O_IP_DST_MASK, O_IP_DST_ME,
O_IP_DST_SET, O_IP6_DST, O_IP6_DST_MASK, O_IP6_DST_ME
};
static void
show_static_rule(struct cmdline_opts *co, struct format_opts *fo,
struct buf_pr *bp, struct ip_fw_rule *rule, struct ip_fw_bcounter *cntr)
{
static int twidth = 0;
struct show_state state;
ipfw_insn *cmd;
size_t i;
/* Print # DISABLED or skip the rule */
if ((fo->set_mask & (1 << rule->set)) == 0) {
/* disabled mask */
if (!co->show_sets)
return;
else
bprintf(bp, "# DISABLED ");
}
if (init_show_state(&state, rule) != 0) {
warn("init_show_state() failed");
return;
}
bprintf(bp, "%05u ", rule->rulenum);
/* Print counters if enabled */
if (fo->pcwidth > 0 || fo->bcwidth > 0) {
pr_u64(bp, &cntr->pcnt, fo->pcwidth);
pr_u64(bp, &cntr->bcnt, fo->bcwidth);
}
/* Print timestamp */
if (co->do_time == TIMESTAMP_NUMERIC)
bprintf(bp, "%10u ", cntr->timestamp);
else if (co->do_time == TIMESTAMP_STRING) {
char timestr[30];
time_t t = (time_t)0;
if (twidth == 0) {
strcpy(timestr, ctime(&t));
*strchr(timestr, '\n') = '\0';
twidth = strlen(timestr);
}
if (cntr->timestamp > 0) {
t = _long_to_time(cntr->timestamp);
strcpy(timestr, ctime(&t));
*strchr(timestr, '\n') = '\0';
bprintf(bp, "%s ", timestr);
} else {
bprintf(bp, "%*s", twidth, " ");
}
}
/* Print set number */
if (co->show_sets)
bprintf(bp, "set %d ", rule->set);
/* Print the optional "match probability" */
cmd = print_opcode(bp, fo, &state, O_PROB);
/* Print rule action */
for (i = 0; i < nitems(action_opcodes); i++) {
cmd = print_action(bp, fo, &state, action_opcodes[i]);
if (cmd == NULL)
continue;
/* Handle special cases */
switch (cmd->opcode) {
case O_CHECK_STATE:
goto end;
case O_EXTERNAL_ACTION:
case O_EXTERNAL_INSTANCE:
/* External action can have several instructions */
continue;
}
break;
}
/* Print rule modifiers */
for (i = 0; i < nitems(modifier_opcodes); i++)
print_action(bp, fo, &state, modifier_opcodes[i]);
/*
* Print rule body
*/
if (co->comment_only != 0)
goto end;
if (rule->flags & IPFW_RULE_JUSTOPTS) {
state.flags |= HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP;
goto justopts;
}
print_proto(bp, fo, &state);
if (co->do_compact != 0 && (rule->flags & IPFW_RULE_NOOPT))
goto justopts;
/* Print source */
bprintf(bp, " from");
print_address(bp, fo, &state, src_opcodes, nitems(src_opcodes),
O_IP_SRCPORT, HAVE_SRCIP);
/* Print destination */
bprintf(bp, " to");
print_address(bp, fo, &state, dst_opcodes, nitems(dst_opcodes),
O_IP_DSTPORT, HAVE_DSTIP);
justopts:
/* Print the rest of options */
while (print_opcode(bp, fo, &state, -1))
;
end:
/* Print comment at the end */
cmd = print_opcode(bp, fo, &state, O_NOP);
if (co->comment_only != 0 && cmd == NULL)
bprintf(bp, " // ...");
bprintf(bp, "\n");
free_show_state(&state);
}
static void
show_dyn_state(struct cmdline_opts *co, struct format_opts *fo,
struct buf_pr *bp, ipfw_dyn_rule *d)
{
struct protoent *pe;
struct in_addr a;
uint16_t rulenum;
char buf[INET6_ADDRSTRLEN];
if (d->expire == 0 && d->dyn_type != O_LIMIT_PARENT)
return;
bcopy(&d->rule, &rulenum, sizeof(rulenum));
bprintf(bp, "%05d", rulenum);
if (fo->pcwidth > 0 || fo->bcwidth > 0) {
bprintf(bp, " ");
pr_u64(bp, &d->pcnt, fo->pcwidth);
pr_u64(bp, &d->bcnt, fo->bcwidth);
bprintf(bp, "(%ds)", d->expire);
}
switch (d->dyn_type) {
case O_LIMIT_PARENT:
bprintf(bp, " PARENT %d", d->count);
break;
case O_LIMIT:
bprintf(bp, " LIMIT");
break;
case O_KEEP_STATE: /* bidir, no mask */
bprintf(bp, " STATE");
break;
}
if ((pe = getprotobynumber(d->id.proto)) != NULL)
bprintf(bp, " %s", pe->p_name);
else
bprintf(bp, " proto %u", d->id.proto);
if (d->id.addr_type == 4) {
a.s_addr = htonl(d->id.src_ip);
bprintf(bp, " %s %d", inet_ntoa(a), d->id.src_port);
a.s_addr = htonl(d->id.dst_ip);
bprintf(bp, " <-> %s %d", inet_ntoa(a), d->id.dst_port);
} else if (d->id.addr_type == 6) {
bprintf(bp, " %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
sizeof(buf)), d->id.src_port);
bprintf(bp, " <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6,
buf, sizeof(buf)), d->id.dst_port);
} else
bprintf(bp, " UNKNOWN <-> UNKNOWN");
if (d->kidx != 0)
bprintf(bp, " :%s", object_search_ctlv(fo->tstate,
d->kidx, IPFW_TLV_STATE_NAME));
#define BOTH_SYN (TH_SYN | (TH_SYN << 8))
#define BOTH_FIN (TH_FIN | (TH_FIN << 8))
if (co->verbose) {
bprintf(bp, " state 0x%08x%s", d->state,
d->state ? " ": ",");
if (d->state & IPFW_DYN_ORPHANED)
bprintf(bp, "ORPHANED,");
if ((d->state & BOTH_SYN) == BOTH_SYN)
bprintf(bp, "BOTH_SYN,");
else {
if (d->state & TH_SYN)
bprintf(bp, "F_SYN,");
if (d->state & (TH_SYN << 8))
bprintf(bp, "R_SYN,");
}
if ((d->state & BOTH_FIN) == BOTH_FIN)
bprintf(bp, "BOTH_FIN,");
else {
if (d->state & TH_FIN)
bprintf(bp, "F_FIN,");
if (d->state & (TH_FIN << 8))
bprintf(bp, "R_FIN,");
}
bprintf(bp, " f_ack 0x%x, r_ack 0x%x", d->ack_fwd,
d->ack_rev);
}
}
static int
do_range_cmd(int cmd, ipfw_range_tlv *rt)
{
ipfw_range_header rh;
size_t sz;
memset(&rh, 0, sizeof(rh));
memcpy(&rh.range, rt, sizeof(*rt));
rh.range.head.length = sizeof(*rt);
rh.range.head.type = IPFW_TLV_RANGE;
sz = sizeof(rh);
if (do_get3(cmd, &rh.opheader, &sz) != 0)
return (-1);
/* Save number of matched objects */
rt->new_set = rh.range.new_set;
return (0);
}
/*
* 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
*/
void
ipfw_sets_handler(char *av[])
{
ipfw_range_tlv rt;
const char *msg;
size_t size;
uint32_t masks[2];
int i;
uint16_t rulenum;
uint8_t cmd;
av++;
memset(&rt, 0, sizeof(rt));
if (av[0] == NULL)
errx(EX_USAGE, "set needs command");
if (_substrcmp(*av, "show") == 0) {
struct format_opts fo;
ipfw_cfg_lheader *cfg;
memset(&fo, 0, sizeof(fo));
if (ipfw_get_config(&g_co, &fo, &cfg, &size) != 0)
err(EX_OSERR, "requesting config failed");
for (i = 0, msg = "disable"; i < RESVD_SET; i++)
if ((cfg->set_mask & (1<<i)) == 0) {
printf("%s %d", msg, i);
msg = "";
}
msg = (cfg->set_mask != (uint32_t)-1) ? " enable" : "enable";
for (i = 0; i < RESVD_SET; i++)
if ((cfg->set_mask & (1<<i)) != 0) {
printf("%s %d", msg, i);
msg = "";
}
printf("\n");
free(cfg);
} else if (_substrcmp(*av, "swap") == 0) {
av++;
if ( av[0] == NULL || av[1] == NULL )
errx(EX_USAGE, "set swap needs 2 set numbers\n");
rt.set = atoi(av[0]);
rt.new_set = atoi(av[1]);
if (!isdigit(*(av[0])) || rt.set > RESVD_SET)
errx(EX_DATAERR, "invalid set number %s\n", av[0]);
if (!isdigit(*(av[1])) || rt.new_set > RESVD_SET)
errx(EX_DATAERR, "invalid set number %s\n", av[1]);
i = do_range_cmd(IP_FW_SET_SWAP, &rt);
} else if (_substrcmp(*av, "move") == 0) {
av++;
if (av[0] && _substrcmp(*av, "rule") == 0) {
rt.flags = IPFW_RCFLAG_RANGE; /* move rules to new set */
cmd = IP_FW_XMOVE;
av++;
} else
cmd = IP_FW_SET_MOVE; /* Move set to new one */
if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
av[3] != NULL || _substrcmp(av[1], "to") != 0)
errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
rulenum = atoi(av[0]);
rt.new_set = atoi(av[2]);
if (cmd == IP_FW_XMOVE) {
rt.start_rule = rulenum;
rt.end_rule = rulenum;
} else
rt.set = rulenum;
rt.new_set = atoi(av[2]);
if (!isdigit(*(av[0])) || (cmd == 3 && rt.set > RESVD_SET) ||
(cmd == 2 && rt.start_rule == IPFW_DEFAULT_RULE) )
errx(EX_DATAERR, "invalid source number %s\n", av[0]);
if (!isdigit(*(av[2])) || rt.new_set > RESVD_SET)
errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
i = do_range_cmd(cmd, &rt);
if (i < 0)
err(EX_OSERR, "failed to move %s",
cmd == IP_FW_SET_MOVE ? "set": "rule");
} else if (_substrcmp(*av, "disable") == 0 ||
_substrcmp(*av, "enable") == 0 ) {
int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
av++;
masks[0] = masks[1] = 0;
while (av[0]) {
if (isdigit(**av)) {
i = atoi(*av);
if (i < 0 || i > RESVD_SET)
errx(EX_DATAERR,
"invalid set number %d\n", i);
masks[which] |= (1<<i);
} else if (_substrcmp(*av, "disable") == 0)
which = 0;
else if (_substrcmp(*av, "enable") == 0)
which = 1;
else
errx(EX_DATAERR,
"invalid set command %s\n", *av);
av++;
}
if ( (masks[0] & masks[1]) != 0 )
errx(EX_DATAERR,
"cannot enable and disable the same set\n");
rt.set = masks[0];
rt.new_set = masks[1];
i = do_range_cmd(IP_FW_SET_ENABLE, &rt);
if (i)
warn("set enable/disable: setsockopt(IP_FW_SET_ENABLE)");
} else
errx(EX_USAGE, "invalid set command %s\n", *av);
}
void
ipfw_sysctl_handler(char *av[], int which)
{
av++;
if (av[0] == NULL) {
warnx("missing keyword to enable/disable\n");
} else if (_substrcmp(*av, "firewall") == 0) {
sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
&which, sizeof(which));
sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
&which, sizeof(which));
} else if (_substrcmp(*av, "one_pass") == 0) {
sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
&which, sizeof(which));
} else if (_substrcmp(*av, "debug") == 0) {
sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
&which, sizeof(which));
} else if (_substrcmp(*av, "verbose") == 0) {
sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
&which, sizeof(which));
} else if (_substrcmp(*av, "dyn_keepalive") == 0) {
sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
&which, sizeof(which));
#ifndef NO_ALTQ
} else if (_substrcmp(*av, "altq") == 0) {
altq_set_enabled(which);
#endif
} else {
warnx("unrecognize enable/disable keyword: %s\n", *av);
}
}
typedef void state_cb(struct cmdline_opts *co, struct format_opts *fo,
void *arg, void *state);
static void
prepare_format_dyn(struct cmdline_opts *co, struct format_opts *fo,
void *arg __unused, void *_state)
{
ipfw_dyn_rule *d;
int width;
uint8_t set;
d = (ipfw_dyn_rule *)_state;
/* Count _ALL_ states */
fo->dcnt++;
if (fo->show_counters == 0)
return;
if (co->use_set) {
/* skip states from another set */
bcopy((char *)&d->rule + sizeof(uint16_t), &set,
sizeof(uint8_t));
if (set != co->use_set - 1)
return;
}
width = pr_u64(NULL, &d->pcnt, 0);
if (width > fo->pcwidth)
fo->pcwidth = width;
width = pr_u64(NULL, &d->bcnt, 0);
if (width > fo->bcwidth)
fo->bcwidth = width;
}
static int
foreach_state(struct cmdline_opts *co, struct format_opts *fo,
caddr_t base, size_t sz, state_cb dyn_bc, void *dyn_arg)
{
int ttype;
state_cb *fptr;
void *farg;
ipfw_obj_tlv *tlv;
ipfw_obj_ctlv *ctlv;
fptr = NULL;
ttype = 0;
while (sz > 0) {
ctlv = (ipfw_obj_ctlv *)base;
switch (ctlv->head.type) {
case IPFW_TLV_DYNSTATE_LIST:
base += sizeof(*ctlv);
sz -= sizeof(*ctlv);
ttype = IPFW_TLV_DYN_ENT;
fptr = dyn_bc;
farg = dyn_arg;
break;
default:
return (sz);
}
while (sz > 0) {
tlv = (ipfw_obj_tlv *)base;
if (tlv->type != ttype)
break;
fptr(co, fo, farg, tlv + 1);
sz -= tlv->length;
base += tlv->length;
}
}
return (sz);
}
static void
prepare_format_opts(struct cmdline_opts *co, struct format_opts *fo,
ipfw_obj_tlv *rtlv, int rcnt, caddr_t dynbase, size_t dynsz)
{
int bcwidth, pcwidth, width;
int n;
struct ip_fw_bcounter *cntr;
struct ip_fw_rule *r;
bcwidth = 0;
pcwidth = 0;
if (fo->show_counters != 0) {
for (n = 0; n < rcnt; n++,
rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) {
cntr = (struct ip_fw_bcounter *)(rtlv + 1);
r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size);
/* skip rules from another set */
if (co->use_set && r->set != co->use_set - 1)
continue;
/* packet counter */
width = pr_u64(NULL, &cntr->pcnt, 0);
if (width > pcwidth)
pcwidth = width;
/* byte counter */
width = pr_u64(NULL, &cntr->bcnt, 0);
if (width > bcwidth)
bcwidth = width;
}
}
fo->bcwidth = bcwidth;
fo->pcwidth = pcwidth;
fo->dcnt = 0;
if (co->do_dynamic && dynsz > 0)
foreach_state(co, fo, dynbase, dynsz, prepare_format_dyn, NULL);
}
static int
list_static_range(struct cmdline_opts *co, struct format_opts *fo,
struct buf_pr *bp, ipfw_obj_tlv *rtlv, int rcnt)
{
int n, seen;
struct ip_fw_rule *r;
struct ip_fw_bcounter *cntr;
int c = 0;
for (n = seen = 0; n < rcnt; n++,
rtlv = (ipfw_obj_tlv *)((caddr_t)rtlv + rtlv->length)) {
if ((fo->show_counters | fo->show_time) != 0) {
cntr = (struct ip_fw_bcounter *)(rtlv + 1);
r = (struct ip_fw_rule *)((caddr_t)cntr + cntr->size);
} else {
cntr = NULL;
r = (struct ip_fw_rule *)(rtlv + 1);
}
if (r->rulenum > fo->last)
break;
if (co->use_set && r->set != co->use_set - 1)
continue;
if (r->rulenum >= fo->first && r->rulenum <= fo->last) {
show_static_rule(co, fo, bp, r, cntr);
printf("%s", bp->buf);
c += rtlv->length;
bp_flush(bp);
seen++;
}
}
return (seen);
}
static void
list_dyn_state(struct cmdline_opts *co, struct format_opts *fo,
void *_arg, void *_state)
{
uint16_t rulenum;
uint8_t set;
ipfw_dyn_rule *d;
struct buf_pr *bp;
d = (ipfw_dyn_rule *)_state;
bp = (struct buf_pr *)_arg;
bcopy(&d->rule, &rulenum, sizeof(rulenum));
if (rulenum > fo->last)
return;
if (co->use_set) {
bcopy((char *)&d->rule + sizeof(uint16_t),
&set, sizeof(uint8_t));
if (set != co->use_set - 1)
return;
}
if (rulenum >= fo->first) {
show_dyn_state(co, fo, bp, d);
printf("%s\n", bp->buf);
bp_flush(bp);
}
}
static int
list_dyn_range(struct cmdline_opts *co, struct format_opts *fo,
struct buf_pr *bp, caddr_t base, size_t sz)
{
sz = foreach_state(co, fo, base, sz, list_dyn_state, bp);
return (sz);
}
void
ipfw_list(int ac, char *av[], int show_counters)
{
ipfw_cfg_lheader *cfg;
struct format_opts sfo;
size_t sz;
int error;
int lac;
char **lav;
uint32_t rnum;
char *endptr;
if (g_co.test_only) {
fprintf(stderr, "Testing only, list disabled\n");
return;
}
if (g_co.do_pipe) {
dummynet_list(ac, av, show_counters);
return;
}
ac--;
av++;
memset(&sfo, 0, sizeof(sfo));
/* Determine rule range to request */
if (ac > 0) {
for (lac = ac, lav = av; lac != 0; lac--) {
rnum = strtoul(*lav++, &endptr, 10);
if (sfo.first == 0 || rnum < sfo.first)
sfo.first = rnum;
if (*endptr == '-')
rnum = strtoul(endptr + 1, &endptr, 10);
if (sfo.last == 0 || rnum > sfo.last)
sfo.last = rnum;
}
}
/* get configuraion from kernel */
cfg = NULL;
sfo.show_counters = show_counters;
sfo.show_time = g_co.do_time;
if (g_co.do_dynamic != 2)
sfo.flags |= IPFW_CFG_GET_STATIC;
if (g_co.do_dynamic != 0)
sfo.flags |= IPFW_CFG_GET_STATES;
if ((sfo.show_counters | sfo.show_time) != 0)
sfo.flags |= IPFW_CFG_GET_COUNTERS;
if (ipfw_get_config(&g_co, &sfo, &cfg, &sz) != 0)
err(EX_OSERR, "retrieving config failed");
error = ipfw_show_config(&g_co, &sfo, cfg, sz, ac, av);
free(cfg);
if (error != EX_OK)
exit(error);
}
static int
ipfw_show_config(struct cmdline_opts *co, struct format_opts *fo,
ipfw_cfg_lheader *cfg, size_t sz, int ac, char *av[])
{
caddr_t dynbase;
size_t dynsz;
int rcnt;
int exitval = EX_OK;
int lac;
char **lav;
char *endptr;
size_t readsz;
struct buf_pr bp;
ipfw_obj_ctlv *ctlv, *tstate;
ipfw_obj_tlv *rbase;
/*
* Handle tablenames TLV first, if any
*/
tstate = NULL;
rbase = NULL;
dynbase = NULL;
dynsz = 0;
readsz = sizeof(*cfg);
rcnt = 0;
fo->set_mask = cfg->set_mask;
ctlv = (ipfw_obj_ctlv *)(cfg + 1);
if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) {
object_sort_ctlv(ctlv);
fo->tstate = ctlv;
readsz += ctlv->head.length;
ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length);
}
if (cfg->flags & IPFW_CFG_GET_STATIC) {
/* We've requested static rules */
if (ctlv->head.type == IPFW_TLV_RULE_LIST) {
rbase = (ipfw_obj_tlv *)(ctlv + 1);
rcnt = ctlv->count;
readsz += ctlv->head.length;
ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv +
ctlv->head.length);
}
}
if ((cfg->flags & IPFW_CFG_GET_STATES) && (readsz != sz)) {
/* We may have some dynamic states */
dynsz = sz - readsz;
/* Skip empty header */
if (dynsz != sizeof(ipfw_obj_ctlv))
dynbase = (caddr_t)ctlv;
else
dynsz = 0;
}
prepare_format_opts(co, fo, rbase, rcnt, dynbase, dynsz);
bp_alloc(&bp, 4096);
/* if no rule numbers were specified, list all rules */
if (ac == 0) {
fo->first = 0;
fo->last = IPFW_DEFAULT_RULE;
if (cfg->flags & IPFW_CFG_GET_STATIC)
list_static_range(co, fo, &bp, rbase, rcnt);
if (co->do_dynamic && dynsz > 0) {
printf("## Dynamic rules (%d %zu):\n", fo->dcnt,
dynsz);
list_dyn_range(co, fo, &bp, dynbase, dynsz);
}
bp_free(&bp);
return (EX_OK);
}
/* display specific rules requested on command line */
for (lac = ac, lav = av; lac != 0; lac--) {
/* convert command line rule # */
fo->last = fo->first = strtoul(*lav++, &endptr, 10);
if (*endptr == '-')
fo->last = strtoul(endptr + 1, &endptr, 10);
if (*endptr) {
exitval = EX_USAGE;
warnx("invalid rule number: %s", *(lav - 1));
continue;
}
if ((cfg->flags & IPFW_CFG_GET_STATIC) == 0)
continue;
if (list_static_range(co, fo, &bp, rbase, rcnt) == 0) {
/* give precedence to other error(s) */
if (exitval == EX_OK)
exitval = EX_UNAVAILABLE;
if (fo->first == fo->last)
warnx("rule %u does not exist", fo->first);
else
warnx("no rules in range %u-%u",
fo->first, fo->last);
}
}
if (co->do_dynamic && dynsz > 0) {
printf("## Dynamic rules:\n");
for (lac = ac, lav = av; lac != 0; lac--) {
fo->last = fo->first = strtoul(*lav++, &endptr, 10);
if (*endptr == '-')
fo->last = strtoul(endptr+1, &endptr, 10);
if (*endptr)
/* already warned */
continue;
list_dyn_range(co, fo, &bp, dynbase, dynsz);
}
}
bp_free(&bp);
return (exitval);
}
/*
* Retrieves current ipfw configuration of given type
* and stores its pointer to @pcfg.
*
* Caller is responsible for freeing @pcfg.
*
* Returns 0 on success.
*/
static int
ipfw_get_config(struct cmdline_opts *co, struct format_opts *fo,
ipfw_cfg_lheader **pcfg, size_t *psize)
{
ipfw_cfg_lheader *cfg;
size_t sz;
int i;
if (co->test_only != 0) {
fprintf(stderr, "Testing only, list disabled\n");
return (0);
}
/* Start with some data size */
sz = 4096;
cfg = NULL;
for (i = 0; i < 16; i++) {
if (cfg != NULL)
free(cfg);
if ((cfg = calloc(1, sz)) == NULL)
return (ENOMEM);
cfg->flags = fo->flags;
cfg->start_rule = fo->first;
cfg->end_rule = fo->last;
if (do_get3(IP_FW_XGET, &cfg->opheader, &sz) != 0) {
if (errno != ENOMEM) {
free(cfg);
return (errno);
}
/* Buffer size is not enough. Try to increase */
sz = sz * 2;
if (sz < cfg->size)
sz = cfg->size;
continue;
}
*pcfg = cfg;
*psize = sz;
return (0);
}
free(cfg);
return (ENOMEM);
}
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);
}
struct tidx {
ipfw_obj_ntlv *idx;
uint32_t count;
uint32_t size;
uint16_t counter;
uint8_t set;
};
int
ipfw_check_object_name(const char *name)
{
int c, i, l;
/*
* Check that name is null-terminated and contains
* valid symbols only. Valid mask is:
* [a-zA-Z0-9\-_\.]{1,63}
*/
l = strlen(name);
if (l == 0 || l >= 64)
return (EINVAL);
for (i = 0; i < l; i++) {
c = name[i];
if (isalpha(c) || isdigit(c) || c == '_' ||
c == '-' || c == '.')
continue;
return (EINVAL);
}
return (0);
}
static const char *default_state_name = "default";
static int
state_check_name(const char *name)
{
if (ipfw_check_object_name(name) != 0)
return (EINVAL);
if (strcmp(name, "any") == 0)
return (EINVAL);
return (0);
}
static int
eaction_check_name(const char *name)
{
if (ipfw_check_object_name(name) != 0)
return (EINVAL);
/* Restrict some 'special' names */
if (match_token(rule_actions, name) != -1 &&
match_token(rule_action_params, name) != -1)
return (EINVAL);
return (0);
}
static uint16_t
pack_object(struct tidx *tstate, const char *name, int otype)
{
ipfw_obj_ntlv *ntlv;
uint32_t i;
for (i = 0; i < tstate->count; i++) {
if (strcmp(tstate->idx[i].name, name) != 0)
continue;
if (tstate->idx[i].set != tstate->set)
continue;
if (tstate->idx[i].head.type != otype)
continue;
return (tstate->idx[i].idx);
}
if (tstate->count + 1 > tstate->size) {
tstate->size += 4;
tstate->idx = realloc(tstate->idx, tstate->size *
sizeof(ipfw_obj_ntlv));
if (tstate->idx == NULL)
return (0);
}
ntlv = &tstate->idx[i];
memset(ntlv, 0, sizeof(ipfw_obj_ntlv));
strlcpy(ntlv->name, name, sizeof(ntlv->name));
ntlv->head.type = otype;
ntlv->head.length = sizeof(ipfw_obj_ntlv);
ntlv->set = tstate->set;
ntlv->idx = ++tstate->counter;
tstate->count++;
return (ntlv->idx);
}
static uint16_t
pack_table(struct tidx *tstate, const char *name)
{
if (table_check_name(name) != 0)
return (0);
return (pack_object(tstate, name, IPFW_TLV_TBL_NAME));
}
void
fill_table(struct _ipfw_insn *cmd, char *av, uint8_t opcode,
struct tidx *tstate)
{
uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
uint16_t uidx;
char *p;
if ((p = strchr(av + 6, ')')) == NULL)
errx(EX_DATAERR, "forgotten parenthesis: '%s'", av);
*p = '\0';
p = strchr(av + 6, ',');
if (p)
*p++ = '\0';
if ((uidx = pack_table(tstate, av + 6)) == 0)
errx(EX_DATAERR, "Invalid table name: %s", av + 6);
cmd->opcode = opcode;
cmd->arg1 = uidx;
if (p) {
cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
d[0] = strtoul(p, NULL, 0);
} else
cmd->len |= F_INSN_SIZE(ipfw_insn);
}
/*
* fills the addr and mask fields in the instruction as appropriate from av.
* Update length as appropriate.
* The following formats are allowed:
* 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
* We can have multiple comma-separated address/mask entries.
*/
static void
fill_ip(ipfw_insn_ip *cmd, char *av, int cblen, struct tidx *tstate)
{
int len = 0;
uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
cmd->o.len &= ~F_LEN_MASK; /* zero len */
if (_substrcmp(av, "any") == 0)
return;
if (_substrcmp(av, "me") == 0) {
cmd->o.len |= F_INSN_SIZE(ipfw_insn);
return;
}
if (strncmp(av, "table(", 6) == 0) {
fill_table(&cmd->o, av, O_IP_DST_LOOKUP, tstate);
return;
}
while (av) {
/*
* After the address we can have '/' or ':' indicating a mask,
* ',' indicating another address follows, '{' indicating a
* set of addresses of unspecified size.
*/
char *t = NULL, *p = strpbrk(av, "/:,{");
int masklen;
char md, nd = '\0';
CHECK_LENGTH(cblen, (int)F_INSN_SIZE(ipfw_insn) + 2 + len);
if (p) {
md = *p;
*p++ = '\0';
if ((t = strpbrk(p, ",{")) != NULL) {
nd = *t;
*t = '\0';
}
} else
md = '\0';
if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
errx(EX_NOHOST, "hostname ``%s'' unknown", av);
switch (md) {
case ':':
if (!inet_aton(p, (struct in_addr *)&d[1]))
errx(EX_DATAERR, "bad netmask ``%s''", p);
break;
case '/':
masklen = atoi(p);
if (masklen == 0)
d[1] = htonl(0U); /* mask */
else if (masklen > 32)
errx(EX_DATAERR, "bad width ``%s''", p);
else
d[1] = htonl(~0U << (32 - masklen));
break;
case '{': /* no mask, assume /24 and put back the '{' */
d[1] = htonl(~0U << (32 - 24));
*(--p) = md;
break;
case ',': /* single address plus continuation */
*(--p) = md;
/* FALLTHROUGH */
case 0: /* initialization value */
default:
d[1] = htonl(~0U); /* force /32 */
break;
}
d[0] &= d[1]; /* mask base address with mask */
if (t)
*t = nd;
/* find next separator */
if (p)
p = strpbrk(p, ",{");
if (p && *p == '{') {
/*
* 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 arg1 bits (rounded up to
* the next multiple of 32) with bits set
* for each host in the map.
*/
uint32_t *map = (uint32_t *)&cmd->mask;
int low, high;
int i = contigmask((uint8_t *)&(d[1]), 32);
if (len > 0)
errx(EX_DATAERR, "address set cannot be in a list");
if (i < 24 || i > 31)
errx(EX_DATAERR, "invalid set with mask %d\n", i);
cmd->o.arg1 = 1<<(32-i); /* map length */
d[0] = ntohl(d[0]); /* base addr in host format */
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++)
map[i] = 0; /* clear map */
av = p + 1;
low = d[0] & 0xff;
high = low + cmd->o.arg1 - 1;
/*
* Here, i stores the previous value when we specify a range
* of addresses within a mask, e.g. 45-63. i = -1 means we
* have no previous value.
*/
i = -1; /* previous value in a range */
while (isdigit(*av)) {
char *s;
int a = strtol(av, &s, 0);
if (s == av) { /* no parameter */
if (*av != '}')
errx(EX_DATAERR, "set not closed\n");
if (i != -1)
errx(EX_DATAERR, "incomplete range %d-", i);
break;
}
if (a < low || a > high)
errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
a, low, high);
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++)
map[i/32] |= 1<<(i & 31);
i = -1;
if (*s == '-')
i = a;
else if (*s == '}')
break;
av = s+1;
}
return;
}
av = p;
if (av) /* then *av must be a ',' */
av++;
/* Check this entry */
if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
/*
* 'any' turns the entire list into a NOP.
* 'not any' never matches, so it is removed from the
* list unless it is the only item, in which case we
* report an error.
*/
if (cmd->o.len & F_NOT) { /* "not any" never matches */
if (av == NULL && len == 0) /* only this entry */
errx(EX_DATAERR, "not any never matches");
}
/* else do nothing and skip this entry */
return;
}
/* A single IP can be stored in an optimized format */
if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
return;
}
len += 2; /* two words... */
d += 2;
} /* end while */
if (len + 1 > F_LEN_MASK)
errx(EX_DATAERR, "address list too long");
cmd->o.len |= len+1;
}
/* n2mask sets n bits of the mask */
void
n2mask(struct in6_addr *mask, int n)
{
static int minimask[9] =
{ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
u_char *p;
memset(mask, 0, sizeof(struct in6_addr));
p = (u_char *) mask;
for (; n > 0; p++, n -= 8) {
if (n >= 8)
*p = 0xff;
else
*p = minimask[n];
}
return;
}
static void
fill_flags_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode,
struct _s_x *flags, char *p)
{
char *e;
uint32_t set = 0, clear = 0;
if (fill_flags(flags, p, &e, &set, &clear) != 0)
errx(EX_DATAERR, "invalid flag %s", e);
cmd->opcode = opcode;
cmd->len = (cmd->len & (F_NOT | F_OR)) | 1;
cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
}
void
ipfw_delete(char *av[])
{
ipfw_range_tlv rt;
char *sep;
int i, j;
int exitval = EX_OK;
int do_set = 0;
av++;
NEED1("missing rule specification");
if ( *av && _substrcmp(*av, "set") == 0) {
/* Do not allow using the following syntax:
* ipfw set N delete set M
*/
if (g_co.use_set)
errx(EX_DATAERR, "invalid syntax");
do_set = 1; /* delete set */
av++;
}
/* Rule number */
while (*av && isdigit(**av)) {
i = strtol(*av, &sep, 10);
j = i;
if (*sep== '-')
j = strtol(sep + 1, NULL, 10);
av++;
if (g_co.do_nat) {
exitval = ipfw_delete_nat(i);
} else if (g_co.do_pipe) {
exitval = ipfw_delete_pipe(g_co.do_pipe, i);
} else {
memset(&rt, 0, sizeof(rt));
if (do_set != 0) {
rt.set = i & 31;
rt.flags = IPFW_RCFLAG_SET;
} else {
rt.start_rule = i & 0xffff;
rt.end_rule = j & 0xffff;
if (rt.start_rule == 0 && rt.end_rule == 0)
rt.flags |= IPFW_RCFLAG_ALL;
else
rt.flags |= IPFW_RCFLAG_RANGE;
if (g_co.use_set != 0) {
rt.set = g_co.use_set - 1;
rt.flags |= IPFW_RCFLAG_SET;
}
}
if (g_co.do_dynamic == 2)
rt.flags |= IPFW_RCFLAG_DYNAMIC;
i = do_range_cmd(IP_FW_XDEL, &rt);
if (i != 0) {
exitval = EX_UNAVAILABLE;
if (g_co.do_quiet)
continue;
warn("rule %u: setsockopt(IP_FW_XDEL)",
rt.start_rule);
} else if (rt.new_set == 0 && do_set == 0 &&
g_co.do_dynamic != 2) {
exitval = EX_UNAVAILABLE;
if (g_co.do_quiet)
continue;
if (rt.start_rule != rt.end_rule)
warnx("no rules rules in %u-%u range",
rt.start_rule, rt.end_rule);
else
warnx("rule %u not found",
rt.start_rule);
}
}
}
if (exitval != EX_OK && g_co.do_force == 0)
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.
* Interface names containing '*', '?', or '[' are assumed to be shell
* patterns which match interfaces.
*/
static void
fill_iface(ipfw_insn_if *cmd, char *arg, int cblen, struct tidx *tstate)
{
char *p;
uint16_t uidx;
cmd->name[0] = '\0';
cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
CHECK_CMDLEN;
/* Parse the interface or address */
if (strcmp(arg, "any") == 0)
cmd->o.len = 0; /* effectively ignore this command */
else if (strncmp(arg, "table(", 6) == 0) {
if ((p = strchr(arg + 6, ')')) == NULL)
errx(EX_DATAERR, "forgotten parenthesis: '%s'", arg);
*p = '\0';
p = strchr(arg + 6, ',');
if (p)
*p++ = '\0';
if ((uidx = pack_table(tstate, arg + 6)) == 0)
errx(EX_DATAERR, "Invalid table name: %s", arg + 6);
cmd->name[0] = '\1'; /* Special value indicating table */
cmd->p.kidx = uidx;
} else if (!isdigit(*arg)) {
strlcpy(cmd->name, arg, sizeof(cmd->name));
cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
} else if (!inet_aton(arg, &cmd->p.ip))
errx(EX_DATAERR, "bad ip address ``%s''", arg);
}
static void
get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
{
int i;
size_t l;
char *ap, *ptr, *optr;
struct ether_addr *mac;
const char *macset = "0123456789abcdefABCDEF:";
if (strcmp(p, "any") == 0) {
for (i = 0; i < ETHER_ADDR_LEN; i++)
addr[i] = mask[i] = 0;
return;
}
optr = ptr = strdup(p);
if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
l = strlen(ap);
if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
errx(EX_DATAERR, "Incorrect MAC address");
bcopy(mac, addr, ETHER_ADDR_LEN);
} else
errx(EX_DATAERR, "Incorrect MAC address");
if (ptr != NULL) { /* we have mask? */
if (p[ptr - optr - 1] == '/') { /* mask len */
long ml = strtol(ptr, &ap, 10);
if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
errx(EX_DATAERR, "Incorrect mask length");
for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
} else { /* mask */
l = strlen(ptr);
if (strspn(ptr, macset) != l ||
(mac = ether_aton(ptr)) == NULL)
errx(EX_DATAERR, "Incorrect mask");
bcopy(mac, mask, ETHER_ADDR_LEN);
}
} else { /* default mask: ff:ff:ff:ff:ff:ff */
for (i = 0; i < ETHER_ADDR_LEN; i++)
mask[i] = 0xff;
}
for (i = 0; i < ETHER_ADDR_LEN; i++)
addr[i] &= mask[i];
free(optr);
}
/*
* 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, int *len)
{
*len -= F_LEN(cmd);
CHECK_LENGTH(*len, 0);
cmd += F_LEN(cmd);
bzero(cmd, sizeof(*cmd));
return cmd;
}
/*
* Takes arguments and copies them into a comment
*/
static void
fill_comment(ipfw_insn *cmd, char **av, int cblen)
{
int i, l;
char *p = (char *)(cmd + 1);
cmd->opcode = O_NOP;
cmd->len = (cmd->len & (F_NOT | F_OR));
/* Compute length of comment string. */
for (i = 0, l = 0; av[i] != NULL; i++)
l += strlen(av[i]) + 1;
if (l == 0)
return;
if (l > 84)
errx(EX_DATAERR,
"comment too long (max 80 chars)");
l = 1 + (l+3)/4;
cmd->len = (cmd->len & (F_NOT | F_OR)) | l;
CHECK_CMDLEN;
for (i = 0; av[i] != NULL; i++) {
strcpy(p, av[i]);
p += strlen(av[i]);
*p++ = ' ';
}
*(--p) = '\0';
}
/*
* 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, uint16_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, char *av[], int cblen)
{
ipfw_insn_mac *mac;
if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
errx(EX_DATAERR, "MAC dst src");
cmd->opcode = O_MACADDR2;
cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
CHECK_CMDLEN;
mac = (ipfw_insn_mac *)cmd;
get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
&(mac->mask[ETHER_ADDR_LEN])); /* src */
return cmd;
}
static ipfw_insn *
add_mactype(ipfw_insn *cmd, char *av, int cblen)
{
if (!av)
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,
cblen);
cmd->opcode = O_MAC_TYPE;
return cmd;
} else
return NULL;
}
static ipfw_insn *
add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
{
struct protoent *pe;
char *ep;
int proto;
proto = strtol(av, &ep, 10);
if (*ep != '\0' || proto <= 0) {
if ((pe = getprotobyname(av)) == NULL)
return NULL;
proto = pe->p_proto;
}
fill_cmd(cmd, O_PROTO, 0, proto);
*protop = proto;
return cmd;
}
static ipfw_insn *
add_proto(ipfw_insn *cmd, char *av, u_char *protop)
{
u_char proto = IPPROTO_IP;
if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
; /* do not set O_IP4 nor O_IP6 */
else if (strcmp(av, "ip4") == 0)
/* explicit "just IPv4" rule */
fill_cmd(cmd, O_IP4, 0, 0);
else if (strcmp(av, "ip6") == 0) {
/* explicit "just IPv6" rule */
proto = IPPROTO_IPV6;
fill_cmd(cmd, O_IP6, 0, 0);
} else
return add_proto0(cmd, av, protop);
*protop = proto;
return cmd;
}
static ipfw_insn *
add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
{
u_char proto = IPPROTO_IP;
if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
; /* do not set O_IP4 nor O_IP6 */
else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
/* explicit "just IPv4" rule */
fill_cmd(cmd, O_IP4, 0, 0);
else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
/* explicit "just IPv6" rule */
proto = IPPROTO_IPV6;
fill_cmd(cmd, O_IP6, 0, 0);
} else
return add_proto0(cmd, av, protop);
*protop = proto;
return cmd;
}
static ipfw_insn *
add_srcip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate)
{
fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate);
if (cmd->opcode == O_IP_DST_SET) /* set */
cmd->opcode = O_IP_SRC_SET;
else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */
cmd->opcode = O_IP_SRC_LOOKUP;
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 /* addr/mask */
cmd->opcode = O_IP_SRC_MASK;
return cmd;
}
static ipfw_insn *
add_dstip(ipfw_insn *cmd, char *av, int cblen, struct tidx *tstate)
{
fill_ip((ipfw_insn_ip *)cmd, av, cblen, tstate);
if (cmd->opcode == O_IP_DST_SET) /* set */
;
else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */
;
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 /* addr/mask */
cmd->opcode = O_IP_DST_MASK;
return cmd;
}
static struct _s_x f_reserved_keywords[] = {
{ "altq", TOK_OR },
{ "//", TOK_OR },
{ "diverted", TOK_OR },
{ "dst-port", TOK_OR },
{ "src-port", TOK_OR },
{ "established", TOK_OR },
{ "keep-state", TOK_OR },
{ "frag", TOK_OR },
{ "icmptypes", TOK_OR },
{ "in", TOK_OR },
{ "out", TOK_OR },
{ "ip6", TOK_OR },
{ "any", TOK_OR },
{ "to", TOK_OR },
{ "via", TOK_OR },
{ "{", TOK_OR },
{ NULL, 0 } /* terminator */
};
static ipfw_insn *
add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen)
{
if (match_token(f_reserved_keywords, av) != -1)
return (NULL);
if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) {
/* XXX todo: check that we have a protocol with ports */
cmd->opcode = opcode;
return cmd;
}
return NULL;
}
static ipfw_insn *
add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate)
{
struct in6_addr a;
char *host, *ch, buf[INET6_ADDRSTRLEN];
ipfw_insn *ret = NULL;
size_t len;
/* Copy first address in set if needed */
if ((ch = strpbrk(av, "/,")) != NULL) {
len = ch - av;
strlcpy(buf, av, sizeof(buf));
if (len < sizeof(buf))
buf[len] = '\0';
host = buf;
} else
host = av;
if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 ||
inet_pton(AF_INET6, host, &a) == 1)
ret = add_srcip6(cmd, av, cblen, tstate);
/* XXX: should check for IPv4, not !IPv6 */
if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
inet_pton(AF_INET6, host, &a) != 1))
ret = add_srcip(cmd, av, cblen, tstate);
if (ret == NULL && strcmp(av, "any") != 0)
ret = cmd;
return ret;
}
static ipfw_insn *
add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen, struct tidx *tstate)
{
struct in6_addr a;
char *host, *ch, buf[INET6_ADDRSTRLEN];
ipfw_insn *ret = NULL;
size_t len;
/* Copy first address in set if needed */
if ((ch = strpbrk(av, "/,")) != NULL) {
len = ch - av;
strlcpy(buf, av, sizeof(buf));
if (len < sizeof(buf))
buf[len] = '\0';
host = buf;
} else
host = av;
if (proto == IPPROTO_IPV6 || strcmp(av, "me6") == 0 ||
inet_pton(AF_INET6, host, &a) == 1)
ret = add_dstip6(cmd, av, cblen, tstate);
/* XXX: should check for IPv4, not !IPv6 */
if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
inet_pton(AF_INET6, host, &a) != 1))
ret = add_dstip(cmd, av, cblen, tstate);
if (ret == NULL && strcmp(av, "any") != 0)
ret = cmd;
return ret;
}
/*
* 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
* optional action parameters, 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, log/altq actions, and the actual action.
*
*/
static void
compile_rule(char *av[], uint32_t *rbuf, int *rbufsize, struct tidx *tstate)
{
/*
* 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 uint32_t actbuf[255], cmdbuf[255];
int rblen, ablen, cblen;
ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
ipfw_insn *first_cmd; /* first match pattern */
struct ip_fw_rule *rule;
/*
* various flags used to record that we entered some fields.
*/
ipfw_insn *have_state = NULL; /* any state-related option */
int have_rstate = 0;
ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
ipfw_insn *have_skipcmd = NULL;
size_t len;
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(rbuf, *rbufsize);
rule = (struct ip_fw_rule *)rbuf;
cmd = (ipfw_insn *)cmdbuf;
action = (ipfw_insn *)actbuf;
rblen = *rbufsize / sizeof(uint32_t);
rblen -= sizeof(struct ip_fw_rule) / sizeof(uint32_t);
ablen = sizeof(actbuf) / sizeof(actbuf[0]);
cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]);
cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1;
#define CHECK_RBUFLEN(len) { CHECK_LENGTH(rblen, len); rblen -= len; }
#define CHECK_ACTLEN CHECK_LENGTH(ablen, action->len)
av++;
/* [rule N] -- Rule number optional */
if (av[0] && isdigit(**av)) {
rule->rulenum = atoi(*av);
av++;
}
/* [set N] -- set number (0..RESVD_SET), optional */
if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
int set = strtoul(av[1], NULL, 10);
if (set < 0 || set > RESVD_SET)
errx(EX_DATAERR, "illegal set %s", av[1]);
rule->set = set;
tstate->set = set;
av += 2;
}
/* [prob D] -- match probability, optional */
if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
match_prob = strtod(av[1], NULL);
if (match_prob <= 0 || match_prob > 1)
errx(EX_DATAERR, "illegal match prob. %s", av[1]);
av += 2;
}
/* action -- mandatory */
NEED1("missing action");
i = match_token(rule_actions, *av);
av++;
action->len = 1; /* default */
CHECK_ACTLEN;
switch(i) {
case TOK_CHECKSTATE:
have_state = action;
action->opcode = O_CHECK_STATE;
if (*av == NULL ||
match_token(rule_options, *av) == TOK_COMMENT) {
action->arg1 = pack_object(tstate,
default_state_name, IPFW_TLV_STATE_NAME);
break;
}
if (*av[0] == ':') {
if (strcmp(*av + 1, "any") == 0)
action->arg1 = 0;
else if (state_check_name(*av + 1) == 0)
action->arg1 = pack_object(tstate, *av + 1,
IPFW_TLV_STATE_NAME);
else
errx(EX_DATAERR, "Invalid state name %s",
*av);
av++;
break;
}
errx(EX_DATAERR, "Invalid state name %s", *av);
break;
case TOK_ABORT:
action->opcode = O_REJECT;
action->arg1 = ICMP_REJECT_ABORT;
break;
case TOK_ABORT6:
action->opcode = O_UNREACH6;
action->arg1 = ICMP6_UNREACH_ABORT;
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_RESET6:
action->opcode = O_UNREACH6;
action->arg1 = ICMP6_UNREACH_RST;
break;
case TOK_UNREACH:
action->opcode = O_REJECT;
NEED1("missing reject code");
fill_reject_code(&action->arg1, *av);
av++;
break;
case TOK_UNREACH6:
action->opcode = O_UNREACH6;
NEED1("missing unreach code");
fill_unreach6_code(&action->arg1, *av);
av++;
break;
case TOK_COUNT:
action->opcode = O_COUNT;
break;
case TOK_NAT:
action->opcode = O_NAT;
action->len = F_INSN_SIZE(ipfw_insn_nat);
CHECK_ACTLEN;
if (*av != NULL && _substrcmp(*av, "global") == 0) {
action->arg1 = IP_FW_NAT44_GLOBAL;
av++;
break;
} else
goto chkarg;
case TOK_QUEUE:
action->opcode = O_QUEUE;
goto chkarg;
case TOK_PIPE:
action->opcode = O_PIPE;
goto chkarg;
case TOK_SKIPTO:
action->opcode = O_SKIPTO;
goto chkarg;
case TOK_NETGRAPH:
action->opcode = O_NETGRAPH;
goto chkarg;
case TOK_NGTEE:
action->opcode = O_NGTEE;
goto chkarg;
case TOK_DIVERT:
action->opcode = O_DIVERT;
goto chkarg;
case TOK_TEE:
action->opcode = O_TEE;
goto chkarg;
case TOK_CALL:
action->opcode = O_CALLRETURN;
chkarg:
if (!av[0])
errx(EX_USAGE, "missing argument for %s", *(av - 1));
if (isdigit(**av)) {
action->arg1 = strtoul(*av, NULL, 10);
if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
errx(EX_DATAERR, "illegal argument for %s",
*(av - 1));
} else if (_substrcmp(*av, "tablearg") == 0) {
action->arg1 = IP_FW_TARG;
} else if (i == TOK_DIVERT || i == TOK_TEE) {
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");
} else
errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
av++;
break;
case TOK_FORWARD: {
/*
* Locate the address-port separator (':' or ',').
* Could be one of the following:
* hostname:port
* IPv4 a.b.c.d,port
* IPv4 a.b.c.d:port
* IPv6 w:x:y::z,port
* IPv6 [w:x:y::z]:port
*/
struct sockaddr_storage result;
struct addrinfo *res;
char *s, *end;
int family;
u_short port_number;
NEED1("missing forward address[:port]");
if (_substrcmp(*av, "tablearg") == 0) {
family = PF_INET;
((struct sockaddr_in*)&result)->sin_addr.s_addr =
INADDR_ANY;
} else {
/*
* Are we an bracket-enclosed IPv6 address?
*/
if (strchr(*av, '['))
(*av)++;
/*
* locate the address-port separator (':' or ',')
*/
s = strchr(*av, ',');
if (s == NULL) {
s = strchr(*av, ']');
/* Prevent erroneous parsing on brackets. */
if (s != NULL)
*(s++) = '\0';
else
s = *av;
/* Distinguish between IPv4:port and IPv6 cases. */
s = strchr(s, ':');
if (s && strchr(s+1, ':'))
s = NULL; /* no port */
}
if (s != NULL) {
/* Terminate host portion and set s to start of port. */
*(s++) = '\0';
i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
if (s == end)
errx(EX_DATAERR,
"illegal forwarding port ``%s''", s);
port_number = (u_short)i;
}
/*
* Resolve the host name or address to a family and a
* network representation of the address.
*/
if (getaddrinfo(*av, NULL, NULL, &res))
errx(EX_DATAERR, NULL);
/* Just use the first host in the answer. */
family = res->ai_family;
memcpy(&result, res->ai_addr, res->ai_addrlen);
freeaddrinfo(res);
}
if (family == PF_INET) {
ipfw_insn_sa *p = (ipfw_insn_sa *)action;
action->opcode = O_FORWARD_IP;
action->len = F_INSN_SIZE(ipfw_insn_sa);
CHECK_ACTLEN;
/*
* In the kernel we assume AF_INET and use only
* sin_port and sin_addr. Remember to set sin_len as
* the routing code seems to use it too.
*/
p->sa.sin_len = sizeof(struct sockaddr_in);
p->sa.sin_family = AF_INET;
p->sa.sin_port = port_number;
p->sa.sin_addr.s_addr =
((struct sockaddr_in *)&result)->sin_addr.s_addr;
} else if (family == PF_INET6) {
ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action;
action->opcode = O_FORWARD_IP6;
action->len = F_INSN_SIZE(ipfw_insn_sa6);
CHECK_ACTLEN;
p->sa.sin6_len = sizeof(struct sockaddr_in6);
p->sa.sin6_family = AF_INET6;
p->sa.sin6_port = port_number;
p->sa.sin6_flowinfo = 0;
p->sa.sin6_scope_id =
((struct sockaddr_in6 *)&result)->sin6_scope_id;
bcopy(&((struct sockaddr_in6*)&result)->sin6_addr,
&p->sa.sin6_addr, sizeof(p->sa.sin6_addr));
} else {
errx(EX_DATAERR, "Invalid address family in forward action");
}
av++;
break;
}
case TOK_COMMENT:
/* pretend it is a 'count' rule followed by the comment */
action->opcode = O_COUNT;
av--; /* go back... */
break;
case TOK_SETFIB:
{
int numfibs;
size_t intsize = sizeof(int);
action->opcode = O_SETFIB;
NEED1("missing fib number");
if (_substrcmp(*av, "tablearg") == 0) {
action->arg1 = IP_FW_TARG;
} else {
action->arg1 = strtoul(*av, NULL, 10);
if (sysctlbyname("net.fibs", &numfibs, &intsize,
NULL, 0) == -1)
errx(EX_DATAERR, "fibs not suported.\n");
if (action->arg1 >= numfibs) /* Temporary */
errx(EX_DATAERR, "fib too large.\n");
/* Add high-order bit to fib to make room for tablearg*/
action->arg1 |= 0x8000;
}
av++;
break;
}
case TOK_SETDSCP:
{
int code;
action->opcode = O_SETDSCP;
NEED1("missing DSCP code");
if (_substrcmp(*av, "tablearg") == 0) {
action->arg1 = IP_FW_TARG;
} else {
if (isalpha(*av[0])) {
if ((code = match_token(f_ipdscp, *av)) == -1)
errx(EX_DATAERR, "Unknown DSCP code");
action->arg1 = code;
} else
action->arg1 = strtoul(*av, NULL, 10);
/*
* Add high-order bit to DSCP to make room
* for tablearg
*/
action->arg1 |= 0x8000;
}
av++;
break;
}
case TOK_REASS:
action->opcode = O_REASS;
break;
case TOK_RETURN:
fill_cmd(action, O_CALLRETURN, F_NOT, 0);
break;
case TOK_TCPSETMSS: {
u_long mss;
uint16_t idx;
idx = pack_object(tstate, "tcp-setmss", IPFW_TLV_EACTION);
if (idx == 0)
errx(EX_DATAERR, "pack_object failed");
fill_cmd(action, O_EXTERNAL_ACTION, 0, idx);
NEED1("Missing MSS value");
action = next_cmd(action, &ablen);
action->len = 1;
CHECK_ACTLEN;
mss = strtoul(*av, NULL, 10);
if (mss == 0 || mss > UINT16_MAX)
errx(EX_USAGE, "invalid MSS value %s", *av);
fill_cmd(action, O_EXTERNAL_DATA, 0, (uint16_t)mss);
av++;
break;
}
default:
av--;
if (match_token(rule_eactions, *av) == -1)
errx(EX_DATAERR, "invalid action %s\n", *av);
/*
* External actions support.
* XXX: we support only syntax with instance name.
* For known external actions (from rule_eactions list)
* we can handle syntax directly. But with `eaction'
* keyword we can use only `eaction <name> <instance>'
* syntax.
*/
case TOK_EACTION: {
uint16_t idx;
NEED1("Missing eaction name");
if (eaction_check_name(*av) != 0)
errx(EX_DATAERR, "Invalid eaction name %s", *av);
idx = pack_object(tstate, *av, IPFW_TLV_EACTION);
if (idx == 0)
errx(EX_DATAERR, "pack_object failed");
fill_cmd(action, O_EXTERNAL_ACTION, 0, idx);
av++;
NEED1("Missing eaction instance name");
action = next_cmd(action, &ablen);
action->len = 1;
CHECK_ACTLEN;
if (eaction_check_name(*av) != 0)
errx(EX_DATAERR, "Invalid eaction instance name %s",
*av);
/*
* External action instance object has TLV type depended
* from the external action name object index. Since we
* currently don't know this index, use zero as TLV type.
*/
idx = pack_object(tstate, *av, 0);
if (idx == 0)
errx(EX_DATAERR, "pack_object failed");
fill_cmd(action, O_EXTERNAL_INSTANCE, 0, idx);
av++;
}
}
action = next_cmd(action, &ablen);
/*
* [altq queuename] -- altq tag, optional
* [log [logamount N]] -- log, optional
*
* If they exist, it go first in the cmdbuf, but then it is
* skipped in the copy section to the end of the buffer.
*/
while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
av++;
switch (i) {
case TOK_LOG:
{
ipfw_insn_log *c = (ipfw_insn_log *)cmd;
int l;
if (have_log)
errx(EX_DATAERR,
"log cannot be specified more than once");
have_log = (ipfw_insn *)c;
cmd->len = F_INSN_SIZE(ipfw_insn_log);
CHECK_CMDLEN;
cmd->opcode = O_LOG;
if (av[0] && _substrcmp(*av, "logamount") == 0) {
av++;
NEED1("logamount requires argument");
l = atoi(*av);
if (l < 0)
errx(EX_DATAERR,
"logamount must be positive");
c->max_log = l;
av++;
} else {
len = sizeof(c->max_log);
if (sysctlbyname("net.inet.ip.fw.verbose_limit",
&c->max_log, &len, NULL, 0) == -1) {
if (g_co.test_only) {
c->max_log = 0;
break;
}
errx(1, "sysctlbyname(\"%s\")",
"net.inet.ip.fw.verbose_limit");
}
}
}
break;
#ifndef NO_ALTQ
case TOK_ALTQ:
{
ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
NEED1("missing altq queue name");
if (have_altq)
errx(EX_DATAERR,
"altq cannot be specified more than once");
have_altq = (ipfw_insn *)a;
cmd->len = F_INSN_SIZE(ipfw_insn_altq);
CHECK_CMDLEN;
cmd->opcode = O_ALTQ;
a->qid = altq_name_to_qid(*av);
av++;
}
break;
#endif
case TOK_TAG:
case TOK_UNTAG: {
uint16_t tag;
if (have_tag)
errx(EX_USAGE, "tag and untag cannot be "
"specified more than once");
GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
rule_action_params);
have_tag = cmd;
fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
av++;
break;
}
default:
abort();
}
cmd = next_cmd(cmd, &cblen);
}
if (have_state) { /* must be a check-state, we are done */
if (*av != NULL &&
match_token(rule_options, *av) == TOK_COMMENT) {
/* check-state has a comment */
av++;
fill_comment(cmd, av, cblen);
cmd = next_cmd(cmd, &cblen);
av[0] = NULL;
}
goto done;
}
#define OR_START(target) \
if (av[0] && (*av[0] == '(' || *av[0] == '{')) { \
if (open_par) \
errx(EX_USAGE, "nested \"(\" not allowed\n"); \
prev = NULL; \
open_par = 1; \
if ( (av[0])[1] == '\0') { \
av++; \
} else \
(*av)++; \
} \
target: \
#define CLOSE_PAR \
if (open_par) { \
if (av[0] && ( \
strcmp(*av, ")") == 0 || \
strcmp(*av, "}") == 0)) { \
prev = NULL; \
open_par = 0; \
av++; \
} else \
errx(EX_USAGE, "missing \")\"\n"); \
}
#define NOT_BLOCK \
if (av[0] && _substrcmp(*av, "not") == 0) { \
if (cmd->len & F_NOT) \
errx(EX_USAGE, "double \"not\" not allowed\n"); \
cmd->len |= F_NOT; \
av++; \
}
#define OR_BLOCK(target) \
if (av[0] && _substrcmp(*av, "or") == 0) { \
if (prev == NULL || open_par == 0) \
errx(EX_DATAERR, "invalid OR block"); \
prev->len |= F_OR; \
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 (_substrcmp(*av, "MAC") == 0 ||
_substrcmp(*av, "mac") == 0) {
av++; /* the "MAC" keyword */
add_mac(cmd, av); /* exits in case of errors */
cmd = next_cmd(cmd);
av += 2; /* dst-mac and src-mac */
NOT_BLOCK;
NEED1("missing mac type");
if (add_mactype(cmd, av[0]))
cmd = next_cmd(cmd);
av++; /* any or mac-type */
goto read_options;
}
#endif
/*
* protocol, mandatory
*/
OR_START(get_proto);
NOT_BLOCK;
NEED1("missing protocol");
if (add_proto_compat(cmd, *av, &proto)) {
av++;
if (F_LEN(cmd) != 0) {
prev = cmd;
cmd = next_cmd(cmd, &cblen);
}
} else if (first_cmd != cmd) {
errx(EX_DATAERR, "invalid protocol ``%s''", *av);
} else {
rule->flags |= IPFW_RULE_JUSTOPTS;
goto read_options;
}
OR_BLOCK(get_proto);
first_cmd = cmd; /* update pointer to use in compact form */
/*
* "from", mandatory
*/
if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
errx(EX_USAGE, "missing ``from''");
av++;
/*
* source IP, mandatory
*/
OR_START(source_ip);
NOT_BLOCK; /* optional "not" */
NEED1("missing source address");
if (add_src(cmd, *av, proto, cblen, tstate)) {
av++;
if (F_LEN(cmd) != 0) { /* ! any */
prev = cmd;
cmd = next_cmd(cmd, &cblen);
}
} else
errx(EX_USAGE, "bad source address %s", *av);
OR_BLOCK(source_ip);
/*
* source ports, optional
*/
NOT_BLOCK; /* optional "not" */
if ( av[0] != NULL ) {
if (_substrcmp(*av, "any") == 0 ||
add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
av++;
if (F_LEN(cmd) != 0)
cmd = next_cmd(cmd, &cblen);
}
}
/*
* "to", mandatory
*/
if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
errx(EX_USAGE, "missing ``to''");
av++;
/*
* destination, mandatory
*/
OR_START(dest_ip);
NOT_BLOCK; /* optional "not" */
NEED1("missing dst address");
if (add_dst(cmd, *av, proto, cblen, tstate)) {
av++;
if (F_LEN(cmd) != 0) { /* ! any */
prev = cmd;
cmd = next_cmd(cmd, &cblen);
}
} else
errx( EX_USAGE, "bad destination address %s", *av);
OR_BLOCK(dest_ip);
/*
* dest. ports, optional
*/
NOT_BLOCK; /* optional "not" */
if (av[0]) {
if (_substrcmp(*av, "any") == 0 ||
add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
av++;
if (F_LEN(cmd) != 0)
cmd = next_cmd(cmd, &cblen);
}
}
if (first_cmd == cmd)
rule->flags |= IPFW_RULE_NOOPT;
read_options:
prev = NULL;
while ( av[0] != NULL ) {
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);
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_DIVERTED:
fill_cmd(cmd, O_DIVERTED, 0, 3);
break;
case TOK_DIVERTEDLOOPBACK:
fill_cmd(cmd, O_DIVERTED, 0, 1);
break;
case TOK_DIVERTEDOUTPUT:
fill_cmd(cmd, O_DIVERTED, 0, 2);
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], cblen, tstate);
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++;
break;
case TOK_ICMP6TYPES:
NEED1("icmptypes requires list of types");
fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen);
av++;
break;
case TOK_IPTTL:
NEED1("ipttl requires TTL");
if (strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_IPTTL, cblen))
errx(EX_DATAERR, "invalid ipttl %s", *av);
} else
fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
av++;
break;
case TOK_IPID:
NEED1("ipid requires id");
if (strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_IPID, cblen))
errx(EX_DATAERR, "invalid ipid %s", *av);
} else
fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
av++;
break;
case TOK_IPLEN:
NEED1("iplen requires length");
if (strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_IPLEN, cblen))
errx(EX_DATAERR, "invalid ip len %s", *av);
} else
fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
av++;
break;
case TOK_IPVER:
NEED1("ipver requires version");
fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
av++;
break;
case TOK_IPPRECEDENCE:
NEED1("ipprecedence requires value");
fill_cmd(cmd, O_IPPRECEDENCE, 0,
(strtoul(*av, NULL, 0) & 7) << 5);
av++;
break;
case TOK_DSCP:
NEED1("missing DSCP code");
fill_dscp(cmd, *av, cblen);
av++;
break;
case TOK_IPOPTS:
NEED1("missing argument for ipoptions");
fill_flags_cmd(cmd, O_IPOPT, f_ipopts, *av);
av++;
break;
case TOK_IPTOS:
NEED1("missing argument for iptos");
fill_flags_cmd(cmd, O_IPTOS, f_iptos, *av);
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);
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);
av++;
}
break;
case TOK_JAIL:
NEED1("jail requires argument");
{
char *end;
int jid;
cmd->opcode = O_JAIL;
/*
* If av is a number, then we'll just pass it as-is. If
* it's a name, try to resolve that to a jid.
*
* We save the jail_getid(3) call for a fallback because
* it entails an unconditional trip to the kernel to
* either validate a jid or resolve a name to a jid.
* This specific token doesn't currently require a
* jid to be an active jail, so we save a transition
* by simply using a number that we're given.
*/
jid = strtoul(*av, &end, 10);
if (*end != '\0') {
jid = jail_getid(*av);
if (jid < 0)
errx(EX_DATAERR, "%s", jail_errmsg);
}
cmd32->d[0] = (uint32_t)jid;
cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
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_TCPDATALEN:
NEED1("tcpdatalen requires length");
if (strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen))
errx(EX_DATAERR, "invalid tcpdata len %s", *av);
} else
fill_cmd(cmd, O_TCPDATALEN, 0,
strtoul(*av, NULL, 0));
av++;
break;
case TOK_TCPOPTS:
NEED1("missing argument for tcpoptions");
fill_flags_cmd(cmd, O_TCPOPTS, f_tcpopts, *av);
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));
av++;
break;
case TOK_TCPMSS:
case TOK_TCPWIN:
NEED1("tcpmss/tcpwin requires size");
if (strpbrk(*av, "-,")) {
if (add_ports(cmd, *av, 0,
i == TOK_TCPWIN ? O_TCPWIN : O_TCPMSS,
cblen) == NULL)
errx(EX_DATAERR, "invalid %s size %s",
s, *av);
} else
fill_cmd(cmd, i == TOK_TCPWIN ? O_TCPWIN :
O_TCPMSS, 0, strtoul(*av, NULL, 0));
av++;
break;
case TOK_TCPFLAGS:
NEED1("missing argument for tcpflags");
cmd->opcode = O_TCPFLAGS;
fill_flags_cmd(cmd, O_TCPFLAGS, f_tcpflags, *av);
av++;
break;
case TOK_KEEPSTATE:
case TOK_RECORDSTATE: {
uint16_t uidx;
if (open_par)
errx(EX_USAGE, "keep-state or record-state cannot be part "
"of an or block");
if (have_state)
errx(EX_USAGE, "only one of keep-state, record-state, "
" limit and set-limit is allowed");
if (*av != NULL && *av[0] == ':') {
if (state_check_name(*av + 1) != 0)
errx(EX_DATAERR,
"Invalid state name %s", *av);
uidx = pack_object(tstate, *av + 1,
IPFW_TLV_STATE_NAME);
av++;
} else
uidx = pack_object(tstate, default_state_name,
IPFW_TLV_STATE_NAME);
have_state = cmd;
have_rstate = i == TOK_RECORDSTATE;
fill_cmd(cmd, O_KEEP_STATE, 0, uidx);
break;
}
case TOK_LIMIT:
case TOK_SETLIMIT: {
ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
int val;
if (open_par)
errx(EX_USAGE,
"limit or set-limit cannot be part of an or block");
if (have_state)
errx(EX_USAGE, "only one of keep-state, record-state, "
" limit and set-limit is allowed");
have_state = cmd;
have_rstate = i == TOK_SETLIMIT;
cmd->len = F_INSN_SIZE(ipfw_insn_limit);
CHECK_CMDLEN;
cmd->opcode = O_LIMIT;
c->limit_mask = c->conn_limit = 0;
while ( av[0] != NULL ) {
if ((val = match_token(limit_masks, *av)) <= 0)
break;
c->limit_mask |= val;
av++;
}
if (c->limit_mask == 0)
errx(EX_USAGE, "limit: missing limit mask");
GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
TOK_LIMIT, rule_options);
av++;
if (*av != NULL && *av[0] == ':') {
if (state_check_name(*av + 1) != 0)
errx(EX_DATAERR,
"Invalid state name %s", *av);
cmd->arg1 = pack_object(tstate, *av + 1,
IPFW_TLV_STATE_NAME);
av++;
} else
cmd->arg1 = pack_object(tstate,
default_state_name, IPFW_TLV_STATE_NAME);
break;
}
case TOK_PROTO:
NEED1("missing protocol");
if (add_proto(cmd, *av, &proto)) {
av++;
} else
errx(EX_DATAERR, "invalid protocol ``%s''",
*av);
break;
case TOK_SRCIP:
NEED1("missing source IP");
if (add_srcip(cmd, *av, cblen, tstate)) {
av++;
}
break;
case TOK_DSTIP:
NEED1("missing destination IP");
if (add_dstip(cmd, *av, cblen, tstate)) {
av++;
}
break;
case TOK_SRCIP6:
NEED1("missing source IP6");
if (add_srcip6(cmd, *av, cblen, tstate)) {
av++;
}
break;
case TOK_DSTIP6:
NEED1("missing destination IP6");
if (add_dstip6(cmd, *av, cblen, tstate)) {
av++;
}
break;
case TOK_SRCPORT:
NEED1("missing source port");
if (_substrcmp(*av, "any") == 0 ||
add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
av++;
} else
errx(EX_DATAERR, "invalid source port %s", *av);
break;
case TOK_DSTPORT:
NEED1("missing destination port");
if (_substrcmp(*av, "any") == 0 ||
add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
av++;
} else
errx(EX_DATAERR, "invalid destination port %s",
*av);
break;
case TOK_MAC:
if (add_mac(cmd, av, cblen))
av += 2;
break;
case TOK_MACTYPE:
NEED1("missing mac type");
if (!add_mactype(cmd, *av, cblen))
errx(EX_DATAERR, "invalid mac type %s", *av);
av++;
break;
case TOK_VERREVPATH:
fill_cmd(cmd, O_VERREVPATH, 0, 0);
break;
case TOK_VERSRCREACH:
fill_cmd(cmd, O_VERSRCREACH, 0, 0);
break;
case TOK_ANTISPOOF:
fill_cmd(cmd, O_ANTISPOOF, 0, 0);
break;
case TOK_IPSEC:
fill_cmd(cmd, O_IPSEC, 0, 0);
break;
case TOK_IPV6:
fill_cmd(cmd, O_IP6, 0, 0);
break;
case TOK_IPV4:
fill_cmd(cmd, O_IP4, 0, 0);
break;
case TOK_EXT6HDR:
fill_ext6hdr( cmd, *av );
av++;
break;
case TOK_FLOWID:
if (proto != IPPROTO_IPV6 )
errx( EX_USAGE, "flow-id filter is active "
"only for ipv6 protocol\n");
fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen);
av++;
break;
case TOK_COMMENT:
fill_comment(cmd, av, cblen);
av[0]=NULL;
break;
case TOK_TAGGED:
if (av[0] && strpbrk(*av, "-,")) {
if (!add_ports(cmd, *av, 0, O_TAGGED, cblen))
errx(EX_DATAERR, "tagged: invalid tag"
" list: %s", *av);
}
else {
uint16_t tag;
GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
TOK_TAGGED, rule_options);
fill_cmd(cmd, O_TAGGED, 0, tag);
}
av++;
break;
case TOK_FIB:
NEED1("fib requires fib number");
fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
av++;
break;
case TOK_SOCKARG:
fill_cmd(cmd, O_SOCKARG, 0, 0);
break;
case TOK_LOOKUP: {
ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
int j;
if (!av[0] || !av[1])
errx(EX_USAGE, "format: lookup argument tablenum");
cmd->opcode = O_IP_DST_LOOKUP;
cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
i = match_token(rule_options, *av);
for (j = 0; lookup_key[j] >= 0 ; j++) {
if (i == lookup_key[j])
break;
}
if (lookup_key[j] <= 0)
errx(EX_USAGE, "format: cannot lookup on %s", *av);
__PAST_END(c->d, 1) = j; // i converted to option
av++;
if ((j = pack_table(tstate, *av)) == 0)
errx(EX_DATAERR, "Invalid table name: %s", *av);
cmd->arg1 = j;
av++;
}
break;
case TOK_FLOW:
NEED1("missing table name");
if (strncmp(*av, "table(", 6) != 0)
errx(EX_DATAERR,
"enclose table name into \"table()\"");
fill_table(cmd, *av, O_IP_FLOW_LOOKUP, tstate);
av++;
break;
case TOK_SKIPACTION:
if (have_skipcmd)
errx(EX_USAGE, "only one defer-action "
"is allowed");
have_skipcmd = cmd;
fill_cmd(cmd, O_SKIP_ACTION, 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, &cblen);
}
}
done:
if (!have_state && have_skipcmd)
warnx("Rule contains \"defer-immediate-action\" "
"and doesn't contain any state-related options.");
/*
* 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 && !have_rstate) {
fill_cmd(dst, O_PROBE_STATE, 0, have_state->arg1);
dst = next_cmd(dst, &rblen);
}
/*
* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG,
* O_SKIP_ACTION
*/
for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
i = F_LEN(src);
CHECK_RBUFLEN(i);
switch (src->opcode) {
case O_LOG:
case O_KEEP_STATE:
case O_LIMIT:
case O_ALTQ:
case O_TAG:
case O_SKIP_ACTION:
break;
default:
bcopy(src, dst, i * sizeof(uint32_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);
CHECK_RBUFLEN(i);
bcopy(have_state, dst, i * sizeof(uint32_t));
dst += i;
}
/*
* put back the have_skipcmd command as very last opcode
*/
if (have_skipcmd) {
i = F_LEN(have_skipcmd);
CHECK_RBUFLEN(i);
bcopy(have_skipcmd, dst, i * sizeof(uint32_t));
dst += i;
}
/*
* start action section
*/
rule->act_ofs = dst - rule->cmd;
/* put back O_LOG, O_ALTQ, O_TAG if necessary */
if (have_log) {
i = F_LEN(have_log);
CHECK_RBUFLEN(i);
bcopy(have_log, dst, i * sizeof(uint32_t));
dst += i;
}
if (have_altq) {
i = F_LEN(have_altq);
CHECK_RBUFLEN(i);
bcopy(have_altq, dst, i * sizeof(uint32_t));
dst += i;
}
if (have_tag) {
i = F_LEN(have_tag);
CHECK_RBUFLEN(i);
bcopy(have_tag, dst, i * sizeof(uint32_t));
dst += i;
}
/*
* copy all other actions
*/
for (src = (ipfw_insn *)actbuf; src != action; src += i) {
i = F_LEN(src);
CHECK_RBUFLEN(i);
bcopy(src, dst, i * sizeof(uint32_t));
dst += i;
}
rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
*rbufsize = (char *)dst - (char *)rule;
}
static int
compare_ntlv(const void *_a, const void *_b)
{
const ipfw_obj_ntlv *a, *b;
a = (const ipfw_obj_ntlv *)_a;
b = (const ipfw_obj_ntlv *)_b;
if (a->set < b->set)
return (-1);
else if (a->set > b->set)
return (1);
if (a->idx < b->idx)
return (-1);
else if (a->idx > b->idx)
return (1);
if (a->head.type < b->head.type)
return (-1);
else if (a->head.type > b->head.type)
return (1);
return (0);
}
/*
* Provide kernel with sorted list of referenced objects
*/
static void
object_sort_ctlv(ipfw_obj_ctlv *ctlv)
{
qsort(ctlv + 1, ctlv->count, ctlv->objsize, compare_ntlv);
}
struct object_kt {
uint16_t uidx;
uint16_t type;
};
static int
compare_object_kntlv(const void *k, const void *v)
{
const ipfw_obj_ntlv *ntlv;
struct object_kt key;
key = *((const struct object_kt *)k);
ntlv = (const ipfw_obj_ntlv *)v;
if (key.uidx < ntlv->idx)
return (-1);
else if (key.uidx > ntlv->idx)
return (1);
if (key.type < ntlv->head.type)
return (-1);
else if (key.type > ntlv->head.type)
return (1);
return (0);
}
/*
* Finds object name in @ctlv by @idx and @type.
* Uses the following facts:
* 1) All TLVs are the same size
* 2) Kernel implementation provides already sorted list.
*
* Returns table name or NULL.
*/
static char *
object_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx, uint16_t type)
{
ipfw_obj_ntlv *ntlv;
struct object_kt key;
key.uidx = idx;
key.type = type;
ntlv = bsearch(&key, (ctlv + 1), ctlv->count, ctlv->objsize,
compare_object_kntlv);
if (ntlv != NULL)
return (ntlv->name);
return (NULL);
}
static char *
table_search_ctlv(ipfw_obj_ctlv *ctlv, uint16_t idx)
{
return (object_search_ctlv(ctlv, idx, IPFW_TLV_TBL_NAME));
}
/*
* Adds one or more rules to ipfw chain.
* Data layout:
* Request:
* [
* ip_fw3_opheader
* [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1)
* [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ] (*2) (*3)
* ]
* Reply:
* [
* ip_fw3_opheader
* [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional)
* [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) [ ip_fw_rule ip_fw_insn ] x N ]
* ]
*
* Rules in reply are modified to store their actual ruleset number.
*
* (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending
* according to their idx field and there has to be no duplicates.
* (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending.
* (*3) Each ip_fw structure needs to be aligned to u64 boundary.
*/
void
ipfw_add(char *av[])
{
uint32_t rulebuf[1024];
int rbufsize, default_off, tlen, rlen;
size_t sz;
struct tidx ts;
struct ip_fw_rule *rule;
caddr_t tbuf;
ip_fw3_opheader *op3;
ipfw_obj_ctlv *ctlv, *tstate;
rbufsize = sizeof(rulebuf);
memset(rulebuf, 0, rbufsize);
memset(&ts, 0, sizeof(ts));
/* Optimize case with no tables */
default_off = sizeof(ipfw_obj_ctlv) + sizeof(ip_fw3_opheader);
op3 = (ip_fw3_opheader *)rulebuf;
ctlv = (ipfw_obj_ctlv *)(op3 + 1);
rule = (struct ip_fw_rule *)(ctlv + 1);
rbufsize -= default_off;
compile_rule(av, (uint32_t *)rule, &rbufsize, &ts);
/* Align rule size to u64 boundary */
rlen = roundup2(rbufsize, sizeof(uint64_t));
tbuf = NULL;
sz = 0;
tstate = NULL;
if (ts.count != 0) {
/* Some tables. We have to alloc more data */
tlen = ts.count * sizeof(ipfw_obj_ntlv);
sz = default_off + sizeof(ipfw_obj_ctlv) + tlen + rlen;
if ((tbuf = calloc(1, sz)) == NULL)
err(EX_UNAVAILABLE, "malloc() failed for IP_FW_ADD");
op3 = (ip_fw3_opheader *)tbuf;
/* Tables first */
ctlv = (ipfw_obj_ctlv *)(op3 + 1);
ctlv->head.type = IPFW_TLV_TBLNAME_LIST;
ctlv->head.length = sizeof(ipfw_obj_ctlv) + tlen;
ctlv->count = ts.count;
ctlv->objsize = sizeof(ipfw_obj_ntlv);
memcpy(ctlv + 1, ts.idx, tlen);
object_sort_ctlv(ctlv);
tstate = ctlv;
/* Rule next */
ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length);
ctlv->head.type = IPFW_TLV_RULE_LIST;
ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen;
ctlv->count = 1;
memcpy(ctlv + 1, rule, rbufsize);
} else {
/* Simply add header */
sz = rlen + default_off;
memset(ctlv, 0, sizeof(*ctlv));
ctlv->head.type = IPFW_TLV_RULE_LIST;
ctlv->head.length = sizeof(ipfw_obj_ctlv) + rlen;
ctlv->count = 1;
}
if (do_get3(IP_FW_XADD, op3, &sz) != 0)
err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_XADD");
if (!g_co.do_quiet) {
struct format_opts sfo;
struct buf_pr bp;
memset(&sfo, 0, sizeof(sfo));
sfo.tstate = tstate;
sfo.set_mask = (uint32_t)(-1);
bp_alloc(&bp, 4096);
show_static_rule(&g_co, &sfo, &bp, rule, NULL);
printf("%s", bp.buf);
bp_free(&bp);
}
if (tbuf != NULL)
free(tbuf);
if (ts.idx != NULL)
free(ts.idx);
}
/*
* clear the counters or the log counters.
* optname has the following values:
* 0 (zero both counters and logging)
* 1 (zero logging only)
*/
void
ipfw_zero(int ac, char *av[], int optname)
{
ipfw_range_tlv rt;
char const *errstr;
char const *name = optname ? "RESETLOG" : "ZERO";
uint32_t arg;
int failed = EX_OK;
optname = optname ? IP_FW_XRESETLOG : IP_FW_XZERO;
av++; ac--;
if (ac == 0) {
/* clear all entries */
memset(&rt, 0, sizeof(rt));
rt.flags = IPFW_RCFLAG_ALL;
if (do_range_cmd(optname, &rt) < 0)
err(EX_UNAVAILABLE, "setsockopt(IP_FW_X%s)", name);
if (!g_co.do_quiet)
printf("%s.\n", optname == IP_FW_XZERO ?
"Accounting cleared":"Logging counts reset");
return;
}
while (ac) {
/* Rule number */
if (isdigit(**av)) {
arg = strtonum(*av, 0, 0xffff, &errstr);
if (errstr)
errx(EX_DATAERR,
"invalid rule number %s\n", *av);
memset(&rt, 0, sizeof(rt));
rt.start_rule = arg;
rt.end_rule = arg;
rt.flags |= IPFW_RCFLAG_RANGE;
if (g_co.use_set != 0) {
rt.set = g_co.use_set - 1;
rt.flags |= IPFW_RCFLAG_SET;
}
if (do_range_cmd(optname, &rt) != 0) {
warn("rule %u: setsockopt(IP_FW_X%s)",
arg, name);
failed = EX_UNAVAILABLE;
} else if (rt.new_set == 0) {
printf("Entry %d not found\n", arg);
failed = EX_UNAVAILABLE;
} else if (!g_co.do_quiet)
printf("Entry %d %s.\n", arg,
optname == IP_FW_XZERO ?
"cleared" : "logging count reset");
} else {
errx(EX_USAGE, "invalid rule number ``%s''", *av);
}
av++; ac--;
}
if (failed != EX_OK)
exit(failed);
}
void
ipfw_flush(int force)
{
ipfw_range_tlv rt;
if (!force && !g_co.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 (g_co.do_pipe) {
dummynet_flush();
return;
}
/* `ipfw set N flush` - is the same that `ipfw delete set N` */
memset(&rt, 0, sizeof(rt));
if (g_co.use_set != 0) {
rt.set = g_co.use_set - 1;
rt.flags = IPFW_RCFLAG_SET;
} else
rt.flags = IPFW_RCFLAG_ALL;
if (do_range_cmd(IP_FW_XDEL, &rt) != 0)
err(EX_UNAVAILABLE, "setsockopt(IP_FW_XDEL)");
if (!g_co.do_quiet)
printf("Flushed all %s.\n", g_co.do_pipe ? "pipes" : "rules");
}
static struct _s_x intcmds[] = {
{ "talist", TOK_TALIST },
{ "iflist", TOK_IFLIST },
{ "olist", TOK_OLIST },
{ "vlist", TOK_VLIST },
{ NULL, 0 }
};
static struct _s_x otypes[] = {
{ "EACTION", IPFW_TLV_EACTION },
{ "DYNSTATE", IPFW_TLV_STATE_NAME },
{ NULL, 0 }
};
static const char*
lookup_eaction_name(ipfw_obj_ntlv *ntlv, int cnt, uint16_t type)
{
const char *name;
int i;
name = NULL;
for (i = 0; i < cnt; i++) {
if (ntlv[i].head.type != IPFW_TLV_EACTION)
continue;
if (IPFW_TLV_EACTION_NAME(ntlv[i].idx) != type)
continue;
name = ntlv[i].name;
break;
}
return (name);
}
static void
ipfw_list_objects(int ac __unused, char *av[] __unused)
{
ipfw_obj_lheader req, *olh;
ipfw_obj_ntlv *ntlv;
const char *name;
size_t sz;
uint32_t i;
memset(&req, 0, sizeof(req));
sz = sizeof(req);
if (do_get3(IP_FW_DUMP_SRVOBJECTS, &req.opheader, &sz) != 0)
if (errno != ENOMEM)
return;
sz = req.size;
if ((olh = calloc(1, sz)) == NULL)
return;
olh->size = sz;
if (do_get3(IP_FW_DUMP_SRVOBJECTS, &olh->opheader, &sz) != 0) {
free(olh);
return;
}
if (olh->count > 0)
printf("Objects list:\n");
else
printf("There are no objects\n");
ntlv = (ipfw_obj_ntlv *)(olh + 1);
for (i = 0; i < olh->count; i++) {
name = match_value(otypes, ntlv->head.type);
if (name == NULL)
name = lookup_eaction_name(
(ipfw_obj_ntlv *)(olh + 1), olh->count,
ntlv->head.type);
if (name == NULL)
printf(" kidx: %4d\ttype: %10d\tname: %s\n",
ntlv->idx, ntlv->head.type, ntlv->name);
else
printf(" kidx: %4d\ttype: %10s\tname: %s\n",
ntlv->idx, name, ntlv->name);
ntlv++;
}
free(olh);
}
void
ipfw_internal_handler(int ac, char *av[])
{
int tcmd;
ac--; av++;
NEED1("internal cmd required");
if ((tcmd = match_token(intcmds, *av)) == -1)
errx(EX_USAGE, "invalid internal sub-cmd: %s", *av);
switch (tcmd) {
case TOK_IFLIST:
ipfw_list_tifaces();
break;
case TOK_TALIST:
ipfw_list_ta(ac, av);
break;
case TOK_OLIST:
ipfw_list_objects(ac, av);
break;
case TOK_VLIST:
ipfw_list_values(ac, av);
break;
}
}
static int
ipfw_get_tracked_ifaces(ipfw_obj_lheader **polh)
{
ipfw_obj_lheader req, *olh;
size_t sz;
memset(&req, 0, sizeof(req));
sz = sizeof(req);
if (do_get3(IP_FW_XIFLIST, &req.opheader, &sz) != 0) {
if (errno != ENOMEM)
return (errno);
}
sz = req.size;
if ((olh = calloc(1, sz)) == NULL)
return (ENOMEM);
olh->size = sz;
if (do_get3(IP_FW_XIFLIST, &olh->opheader, &sz) != 0) {
free(olh);
return (errno);
}
*polh = olh;
return (0);
}
static int
ifinfo_cmp(const void *a, const void *b)
{
const ipfw_iface_info *ia, *ib;
ia = (const ipfw_iface_info *)a;
ib = (const ipfw_iface_info *)b;
return (stringnum_cmp(ia->ifname, ib->ifname));
}
/*
* Retrieves table list from kernel,
* optionally sorts it and calls requested function for each table.
* Returns 0 on success.
*/
static void
ipfw_list_tifaces(void)
{
ipfw_obj_lheader *olh;
ipfw_iface_info *info;
uint32_t i;
int error;
if ((error = ipfw_get_tracked_ifaces(&olh)) != 0)
err(EX_OSERR, "Unable to request ipfw tracked interface list");
qsort(olh + 1, olh->count, olh->objsize, ifinfo_cmp);
info = (ipfw_iface_info *)(olh + 1);
for (i = 0; i < olh->count; i++) {
if (info->flags & IPFW_IFFLAG_RESOLVED)
printf("%s ifindex: %d refcount: %u changes: %u\n",
info->ifname, info->ifindex, info->refcnt,
info->gencnt);
else
printf("%s ifindex: unresolved refcount: %u changes: %u\n",
info->ifname, info->refcnt, info->gencnt);
info = (ipfw_iface_info *)((caddr_t)info + olh->objsize);
}
free(olh);
}
Reference in New Issue View Git Blame Copy Permalink