537 lines
13 KiB
C
537 lines
13 KiB
C
/*
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* Copyright (c) 2002-2003 Luigi Rizzo
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* Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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*
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* Idea and grammar partially left from:
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* Copyright (c) 1993 Daniel Boulet
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*
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* NEW command line interface for IP firewall facility
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*
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* $FreeBSD$
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*
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* ipv6 support
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include "ipfw2.h"
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#include <err.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/icmp6.h>
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#include <netinet/ip_fw.h>
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#include <arpa/inet.h>
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#define CHECK_LENGTH(v, len) do { \
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if ((v) < (len)) \
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errx(EX_DATAERR, "Rule too long"); \
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} while (0)
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static struct _s_x icmp6codes[] = {
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{ "no-route", ICMP6_DST_UNREACH_NOROUTE },
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{ "admin-prohib", ICMP6_DST_UNREACH_ADMIN },
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{ "address", ICMP6_DST_UNREACH_ADDR },
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{ "port", ICMP6_DST_UNREACH_NOPORT },
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{ NULL, 0 }
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};
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void
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fill_unreach6_code(u_short *codep, char *str)
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{
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int val;
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char *s;
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val = strtoul(str, &s, 0);
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if (s == str || *s != '\0' || val >= 0x100)
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val = match_token(icmp6codes, str);
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if (val < 0)
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errx(EX_DATAERR, "unknown ICMPv6 unreachable code ``%s''", str);
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*codep = val;
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return;
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}
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void
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print_unreach6_code(struct buf_pr *bp, uint16_t code)
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{
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char const *s = match_value(icmp6codes, code);
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if (s != NULL)
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bprintf(bp, "unreach6 %s", s);
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else
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bprintf(bp, "unreach6 %u", code);
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}
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/*
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* Print the ip address contained in a command.
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*/
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void
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print_ip6(struct buf_pr *bp, ipfw_insn_ip6 *cmd, char const *s)
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{
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struct hostent *he = NULL;
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int len = F_LEN((ipfw_insn *) cmd) - 1;
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struct in6_addr *a = &(cmd->addr6);
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char trad[255];
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bprintf(bp, "%s%s ", cmd->o.len & F_NOT ? " not": "", s);
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if (cmd->o.opcode == O_IP6_SRC_ME || cmd->o.opcode == O_IP6_DST_ME) {
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bprintf(bp, "me6");
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return;
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}
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if (cmd->o.opcode == O_IP6) {
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bprintf(bp, " ip6");
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return;
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}
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/*
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* len == 4 indicates a single IP, whereas lists of 1 or more
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* addr/mask pairs have len = (2n+1). We convert len to n so we
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* use that to count the number of entries.
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*/
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for (len = len / 4; len > 0; len -= 2, a += 2) {
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int mb = /* mask length */
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(cmd->o.opcode == O_IP6_SRC || cmd->o.opcode == O_IP6_DST) ?
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128 : contigmask((uint8_t *)&(a[1]), 128);
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if (mb == 128 && co.do_resolv)
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he = gethostbyaddr((char *)a, sizeof(*a), AF_INET6);
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if (he != NULL) /* resolved to name */
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bprintf(bp, "%s", he->h_name);
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else if (mb == 0) /* any */
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bprintf(bp, "any");
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else { /* numeric IP followed by some kind of mask */
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if (inet_ntop(AF_INET6, a, trad, sizeof( trad ) ) == NULL)
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bprintf(bp, "Error ntop in print_ip6\n");
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bprintf(bp, "%s", trad );
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if (mb < 0) /* XXX not really legal... */
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bprintf(bp, ":%s",
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inet_ntop(AF_INET6, &a[1], trad, sizeof(trad)));
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else if (mb < 128)
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bprintf(bp, "/%d", mb);
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}
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if (len > 2)
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bprintf(bp, ",");
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}
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}
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void
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fill_icmp6types(ipfw_insn_icmp6 *cmd, char *av, int cblen)
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{
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uint8_t type;
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CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn_icmp6));
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bzero(cmd, sizeof(*cmd));
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while (*av) {
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if (*av == ',')
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av++;
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type = strtoul(av, &av, 0);
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if (*av != ',' && *av != '\0')
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errx(EX_DATAERR, "invalid ICMP6 type");
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/*
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* XXX: shouldn't this be 0xFF? I can't see any reason why
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* we shouldn't be able to filter all possiable values
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* regardless of the ability of the rest of the kernel to do
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* anything useful with them.
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*/
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if (type > ICMP6_MAXTYPE)
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errx(EX_DATAERR, "ICMP6 type out of range");
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cmd->d[type / 32] |= ( 1 << (type % 32));
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}
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cmd->o.opcode = O_ICMP6TYPE;
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cmd->o.len |= F_INSN_SIZE(ipfw_insn_icmp6);
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}
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void
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print_icmp6types(struct buf_pr *bp, ipfw_insn_u32 *cmd)
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{
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int i, j;
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char sep= ' ';
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bprintf(bp, " ip6 icmp6types");
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for (i = 0; i < 7; i++)
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for (j=0; j < 32; ++j) {
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if ( (cmd->d[i] & (1 << (j))) == 0)
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continue;
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bprintf(bp, "%c%d", sep, (i*32 + j));
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sep = ',';
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}
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}
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void
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print_flow6id(struct buf_pr *bp, ipfw_insn_u32 *cmd)
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{
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uint16_t i, limit = cmd->o.arg1;
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char sep = ',';
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bprintf(bp, " flow-id ");
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for( i=0; i < limit; ++i) {
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if (i == limit - 1)
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sep = ' ';
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bprintf(bp, "%d%c", cmd->d[i], sep);
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}
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}
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/* structure and define for the extension header in ipv6 */
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static struct _s_x ext6hdrcodes[] = {
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{ "frag", EXT_FRAGMENT },
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{ "hopopt", EXT_HOPOPTS },
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{ "route", EXT_ROUTING },
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{ "dstopt", EXT_DSTOPTS },
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{ "ah", EXT_AH },
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{ "esp", EXT_ESP },
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{ "rthdr0", EXT_RTHDR0 },
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{ "rthdr2", EXT_RTHDR2 },
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{ NULL, 0 }
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};
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/* fills command for the extension header filtering */
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int
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fill_ext6hdr( ipfw_insn *cmd, char *av)
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{
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int tok;
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char *s = av;
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cmd->arg1 = 0;
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while(s) {
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av = strsep( &s, ",") ;
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tok = match_token(ext6hdrcodes, av);
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switch (tok) {
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case EXT_FRAGMENT:
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cmd->arg1 |= EXT_FRAGMENT;
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break;
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case EXT_HOPOPTS:
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cmd->arg1 |= EXT_HOPOPTS;
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break;
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case EXT_ROUTING:
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cmd->arg1 |= EXT_ROUTING;
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break;
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case EXT_DSTOPTS:
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cmd->arg1 |= EXT_DSTOPTS;
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break;
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case EXT_AH:
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cmd->arg1 |= EXT_AH;
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break;
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case EXT_ESP:
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cmd->arg1 |= EXT_ESP;
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break;
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case EXT_RTHDR0:
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cmd->arg1 |= EXT_RTHDR0;
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break;
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case EXT_RTHDR2:
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cmd->arg1 |= EXT_RTHDR2;
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break;
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default:
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errx( EX_DATAERR, "invalid option for ipv6 exten header" );
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break;
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}
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}
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if (cmd->arg1 == 0 )
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return 0;
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cmd->opcode = O_EXT_HDR;
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cmd->len |= F_INSN_SIZE( ipfw_insn );
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return 1;
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}
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void
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print_ext6hdr(struct buf_pr *bp, ipfw_insn *cmd )
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{
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char sep = ' ';
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bprintf(bp, " extension header:");
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if (cmd->arg1 & EXT_FRAGMENT ) {
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bprintf(bp, "%cfragmentation", sep);
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sep = ',';
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}
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if (cmd->arg1 & EXT_HOPOPTS ) {
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bprintf(bp, "%chop options", sep);
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sep = ',';
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}
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if (cmd->arg1 & EXT_ROUTING ) {
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bprintf(bp, "%crouting options", sep);
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sep = ',';
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}
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if (cmd->arg1 & EXT_RTHDR0 ) {
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bprintf(bp, "%crthdr0", sep);
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sep = ',';
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}
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if (cmd->arg1 & EXT_RTHDR2 ) {
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bprintf(bp, "%crthdr2", sep);
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sep = ',';
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}
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if (cmd->arg1 & EXT_DSTOPTS ) {
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bprintf(bp, "%cdestination options", sep);
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sep = ',';
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}
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if (cmd->arg1 & EXT_AH ) {
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bprintf(bp, "%cauthentication header", sep);
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sep = ',';
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}
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if (cmd->arg1 & EXT_ESP ) {
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bprintf(bp, "%cencapsulated security payload", sep);
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}
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}
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/* Try to find ipv6 address by hostname */
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static int
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lookup_host6 (char *host, struct in6_addr *ip6addr)
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{
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struct hostent *he;
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if (!inet_pton(AF_INET6, host, ip6addr)) {
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if ((he = gethostbyname2(host, AF_INET6)) == NULL)
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return(-1);
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memcpy(ip6addr, he->h_addr_list[0], sizeof( struct in6_addr));
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}
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return(0);
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}
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/*
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* fill the addr and mask fields in the instruction as appropriate from av.
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* Update length as appropriate.
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* The following formats are allowed:
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* any matches any IP6. Actually returns an empty instruction.
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* me returns O_IP6_*_ME
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*
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* 03f1::234:123:0342 single IP6 address
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* 03f1::234:123:0342/24 address/mask
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* 03f1::234:123:0342/24,03f1::234:123:0343/ List of address
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*
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* Set of address (as in ipv6) not supported because ipv6 address
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* are typically random past the initial prefix.
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* Return 1 on success, 0 on failure.
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*/
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static int
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fill_ip6(ipfw_insn_ip6 *cmd, char *av, int cblen)
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{
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int len = 0;
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struct in6_addr *d = &(cmd->addr6);
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/*
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* Needed for multiple address.
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* Note d[1] points to struct in6_add r mask6 of cmd
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*/
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cmd->o.len &= ~F_LEN_MASK; /* zero len */
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if (strcmp(av, "any") == 0)
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return (1);
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if (strcmp(av, "me") == 0) { /* Set the data for "me" opt*/
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cmd->o.len |= F_INSN_SIZE(ipfw_insn);
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return (1);
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}
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if (strcmp(av, "me6") == 0) { /* Set the data for "me" opt*/
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cmd->o.len |= F_INSN_SIZE(ipfw_insn);
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return (1);
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}
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if (strncmp(av, "table(", 6) == 0) {
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char *p = strchr(av + 6, ',');
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uint32_t *dm = ((ipfw_insn_u32 *)cmd)->d;
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if (p)
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*p++ = '\0';
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cmd->o.opcode = O_IP_DST_LOOKUP;
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cmd->o.arg1 = strtoul(av + 6, NULL, 0);
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if (p) {
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cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
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dm[0] = strtoul(p, NULL, 0);
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} else
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cmd->o.len |= F_INSN_SIZE(ipfw_insn);
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return (1);
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}
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av = strdup(av);
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while (av) {
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/*
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* After the address we can have '/' indicating a mask,
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* or ',' indicating another address follows.
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*/
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char *p;
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int masklen;
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char md = '\0';
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CHECK_LENGTH(cblen, 1 + len + 2 * F_INSN_SIZE(struct in6_addr));
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if ((p = strpbrk(av, "/,")) ) {
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md = *p; /* save the separator */
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*p = '\0'; /* terminate address string */
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p++; /* and skip past it */
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}
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/* now p points to NULL, mask or next entry */
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/* lookup stores address in *d as a side effect */
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if (lookup_host6(av, d) != 0) {
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/* XXX: failed. Free memory and go */
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errx(EX_DATAERR, "bad address \"%s\"", av);
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}
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/* next, look at the mask, if any */
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masklen = (md == '/') ? atoi(p) : 128;
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if (masklen > 128 || masklen < 0)
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errx(EX_DATAERR, "bad width \"%s\''", p);
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else
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n2mask(&d[1], masklen);
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APPLY_MASK(d, &d[1]) /* mask base address with mask */
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/* find next separator */
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if (md == '/') { /* find separator past the mask */
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p = strpbrk(p, ",");
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if (p != NULL)
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p++;
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}
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av = p;
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/* Check this entry */
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if (masklen == 0) {
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/*
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* 'any' turns the entire list into a NOP.
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* 'not any' never matches, so it is removed from the
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* list unless it is the only item, in which case we
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* report an error.
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*/
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if (cmd->o.len & F_NOT && av == NULL && len == 0)
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errx(EX_DATAERR, "not any never matches");
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continue;
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}
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/*
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* A single IP can be stored alone
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*/
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if (masklen == 128 && av == NULL && len == 0) {
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len = F_INSN_SIZE(struct in6_addr);
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break;
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}
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/* Update length and pointer to arguments */
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len += F_INSN_SIZE(struct in6_addr)*2;
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d += 2;
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} /* end while */
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/*
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* Total length of the command, remember that 1 is the size of
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* the base command.
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*/
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if (len + 1 > F_LEN_MASK)
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errx(EX_DATAERR, "address list too long");
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cmd->o.len |= len+1;
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free(av);
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return (1);
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}
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/*
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* fills command for ipv6 flow-id filtering
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* note that the 20 bit flow number is stored in a array of u_int32_t
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* it's supported lists of flow-id, so in the o.arg1 we store how many
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* additional flow-id we want to filter, the basic is 1
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*/
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void
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fill_flow6( ipfw_insn_u32 *cmd, char *av, int cblen)
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{
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u_int32_t type; /* Current flow number */
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u_int16_t nflow = 0; /* Current flow index */
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char *s = av;
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cmd->d[0] = 0; /* Initializing the base number*/
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while (s) {
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CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn_u32) + nflow + 1);
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av = strsep( &s, ",") ;
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type = strtoul(av, &av, 0);
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if (*av != ',' && *av != '\0')
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errx(EX_DATAERR, "invalid ipv6 flow number %s", av);
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if (type > 0xfffff)
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errx(EX_DATAERR, "flow number out of range %s", av);
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cmd->d[nflow] |= type;
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nflow++;
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}
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if( nflow > 0 ) {
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cmd->o.opcode = O_FLOW6ID;
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cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + nflow;
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cmd->o.arg1 = nflow;
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}
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else {
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errx(EX_DATAERR, "invalid ipv6 flow number %s", av);
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}
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}
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ipfw_insn *
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add_srcip6(ipfw_insn *cmd, char *av, int cblen)
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{
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fill_ip6((ipfw_insn_ip6 *)cmd, av, cblen);
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if (cmd->opcode == O_IP_DST_SET) /* set */
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cmd->opcode = O_IP_SRC_SET;
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else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */
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cmd->opcode = O_IP_SRC_LOOKUP;
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else if (F_LEN(cmd) == 0) { /* any */
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} else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */
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cmd->opcode = O_IP6_SRC_ME;
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} else if (F_LEN(cmd) ==
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(F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) {
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/* single IP, no mask*/
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cmd->opcode = O_IP6_SRC;
|
|
} else { /* addr/mask opt */
|
|
cmd->opcode = O_IP6_SRC_MASK;
|
|
}
|
|
return cmd;
|
|
}
|
|
|
|
ipfw_insn *
|
|
add_dstip6(ipfw_insn *cmd, char *av, int cblen)
|
|
{
|
|
|
|
fill_ip6((ipfw_insn_ip6 *)cmd, av, cblen);
|
|
if (cmd->opcode == O_IP_DST_SET) /* set */
|
|
;
|
|
else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */
|
|
;
|
|
else if (F_LEN(cmd) == 0) { /* any */
|
|
} else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */
|
|
cmd->opcode = O_IP6_DST_ME;
|
|
} else if (F_LEN(cmd) ==
|
|
(F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) {
|
|
/* single IP, no mask*/
|
|
cmd->opcode = O_IP6_DST;
|
|
} else { /* addr/mask opt */
|
|
cmd->opcode = O_IP6_DST_MASK;
|
|
}
|
|
return cmd;
|
|
}
|