/* Code to take an ip6tables-style command line and do it. */ /* * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au * * (C) 2000-2002 by the netfilter coreteam : * Paul 'Rusty' Russell * Marc Boucher * James Morris * Harald Welte * Jozsef Kadlecsik * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifndef TRUE #define TRUE 1 #endif #ifndef FALSE #define FALSE 0 #endif #define FMT_NUMERIC 0x0001 #define FMT_NOCOUNTS 0x0002 #define FMT_KILOMEGAGIGA 0x0004 #define FMT_OPTIONS 0x0008 #define FMT_NOTABLE 0x0010 #define FMT_NOTARGET 0x0020 #define FMT_VIA 0x0040 #define FMT_NONEWLINE 0x0080 #define FMT_LINENUMBERS 0x0100 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \ | FMT_NUMERIC | FMT_NOTABLE) #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab)) #define CMD_NONE 0x0000U #define CMD_INSERT 0x0001U #define CMD_DELETE 0x0002U #define CMD_DELETE_NUM 0x0004U #define CMD_REPLACE 0x0008U #define CMD_APPEND 0x0010U #define CMD_LIST 0x0020U #define CMD_FLUSH 0x0040U #define CMD_ZERO 0x0080U #define CMD_NEW_CHAIN 0x0100U #define CMD_DELETE_CHAIN 0x0200U #define CMD_SET_POLICY 0x0400U #define CMD_RENAME_CHAIN 0x0800U #define NUMBER_OF_CMD 13 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', 'N', 'X', 'P', 'E' }; #define OPTION_OFFSET 256 #define OPT_NONE 0x00000U #define OPT_NUMERIC 0x00001U #define OPT_SOURCE 0x00002U #define OPT_DESTINATION 0x00004U #define OPT_PROTOCOL 0x00008U #define OPT_JUMP 0x00010U #define OPT_VERBOSE 0x00020U #define OPT_EXPANDED 0x00040U #define OPT_VIANAMEIN 0x00080U #define OPT_VIANAMEOUT 0x00100U #define OPT_LINENUMBERS 0x00200U #define OPT_COUNTERS 0x00400U #define NUMBER_OF_OPT 11 static const char optflags[NUMBER_OF_OPT] = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c'}; static struct option original_opts[] = { { "append", 1, 0, 'A' }, { "delete", 1, 0, 'D' }, { "insert", 1, 0, 'I' }, { "replace", 1, 0, 'R' }, { "list", 2, 0, 'L' }, { "flush", 2, 0, 'F' }, { "zero", 2, 0, 'Z' }, { "new-chain", 1, 0, 'N' }, { "delete-chain", 2, 0, 'X' }, { "rename-chain", 1, 0, 'E' }, { "policy", 1, 0, 'P' }, { "source", 1, 0, 's' }, { "destination", 1, 0, 'd' }, { "src", 1, 0, 's' }, /* synonym */ { "dst", 1, 0, 'd' }, /* synonym */ { "protocol", 1, 0, 'p' }, { "in-interface", 1, 0, 'i' }, { "jump", 1, 0, 'j' }, { "table", 1, 0, 't' }, { "match", 1, 0, 'm' }, { "numeric", 0, 0, 'n' }, { "out-interface", 1, 0, 'o' }, { "verbose", 0, 0, 'v' }, { "exact", 0, 0, 'x' }, { "version", 0, 0, 'V' }, { "help", 2, 0, 'h' }, { "line-numbers", 0, 0, '0' }, { "modprobe", 1, 0, 'M' }, { "set-counters", 1, 0, 'c' }, { 0 } }; /* we need this for ip6tables-restore. ip6tables-restore.c sets line to the * current line of the input file, in order to give a more precise error * message. ip6tables itself doesn't need this, so it is initialized to the * magic number of -1 */ int line = -1; static struct option *opts = original_opts; static unsigned int global_option_offset = 0; /* Table of legal combinations of commands and options. If any of the * given commands make an option legal, that option is legal (applies to * CMD_LIST and CMD_ZERO only). * Key: * + compulsory * x illegal * optional */ static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] = /* Well, it's better than "Re: Linux vs FreeBSD" */ { /* -n -s -d -p -j -v -x -i -o --line -c */ /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'}, /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'}, /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, /*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x'}, /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x'}, /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'} }; static int inverse_for_options[NUMBER_OF_OPT] = { /* -n */ 0, /* -s */ IP6T_INV_SRCIP, /* -d */ IP6T_INV_DSTIP, /* -p */ IP6T_INV_PROTO, /* -j */ 0, /* -v */ 0, /* -x */ 0, /* -i */ IP6T_INV_VIA_IN, /* -o */ IP6T_INV_VIA_OUT, /*--line*/ 0, /* -c */ 0, }; const char *program_version; const char *program_name; /* Extra debugging from libiptc */ extern void dump_entries6(const ip6tc_handle_t handle); /* A few hardcoded protocols for 'all' and in case the user has no /etc/protocols */ struct pprot { char *name; u_int8_t num; }; struct afinfo afinfo = { .family = AF_INET6, .libprefix = "libip6t_", .ipproto = IPPROTO_IPV6, .kmod = "ip6_tables", .so_rev_match = IP6T_SO_GET_REVISION_MATCH, .so_rev_target = IP6T_SO_GET_REVISION_TARGET, }; /* Primitive headers... */ /* defined in netinet/in.h */ #if 0 #ifndef IPPROTO_ESP #define IPPROTO_ESP 50 #endif #ifndef IPPROTO_AH #define IPPROTO_AH 51 #endif #endif #ifndef IPPROTO_MH #define IPPROTO_MH 135 #endif static const struct pprot chain_protos[] = { { "tcp", IPPROTO_TCP }, { "udp", IPPROTO_UDP }, { "udplite", IPPROTO_UDPLITE }, { "icmpv6", IPPROTO_ICMPV6 }, { "ipv6-icmp", IPPROTO_ICMPV6 }, { "esp", IPPROTO_ESP }, { "ah", IPPROTO_AH }, { "ipv6-mh", IPPROTO_MH }, { "mh", IPPROTO_MH }, { "all", 0 }, }; static char * proto_to_name(u_int8_t proto, int nolookup) { unsigned int i; if (proto && !nolookup) { struct protoent *pent = getprotobynumber(proto); if (pent) return pent->p_name; } for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++) if (chain_protos[i].num == proto) return chain_protos[i].name; return NULL; } static void in6addrcpy(struct in6_addr *dst, struct in6_addr *src) { memcpy(dst, src, sizeof(struct in6_addr)); /* dst->s6_addr = src->s6_addr; */ } static void free_opts(int reset_offset) { if (opts != original_opts) { free(opts); opts = original_opts; if (reset_offset) global_option_offset = 0; } } static void exit_tryhelp(int status) { if (line != -1) fprintf(stderr, "Error occurred at line: %d\n", line); fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", program_name, program_name ); free_opts(1); exit(status); } static void exit_printhelp(struct ip6tables_rule_match *matches) { struct ip6tables_rule_match *matchp = NULL; struct ip6tables_target *t = NULL; printf("%s v%s\n\n" "Usage: %s -[AD] chain rule-specification [options]\n" " %s -[RI] chain rulenum rule-specification [options]\n" " %s -D chain rulenum [options]\n" " %s -[LFZ] [chain] [options]\n" " %s -[NX] chain\n" " %s -E old-chain-name new-chain-name\n" " %s -P chain target [options]\n" " %s -h (print this help information)\n\n", program_name, program_version, program_name, program_name, program_name, program_name, program_name, program_name, program_name, program_name); printf( "Commands:\n" "Either long or short options are allowed.\n" " --append -A chain Append to chain\n" " --delete -D chain Delete matching rule from chain\n" " --delete -D chain rulenum\n" " Delete rule rulenum (1 = first) from chain\n" " --insert -I chain [rulenum]\n" " Insert in chain as rulenum (default 1=first)\n" " --replace -R chain rulenum\n" " Replace rule rulenum (1 = first) in chain\n" " --list -L [chain] List the rules in a chain or all chains\n" " --flush -F [chain] Delete all rules in chain or all chains\n" " --zero -Z [chain] Zero counters in chain or all chains\n" " --new -N chain Create a new user-defined chain\n" " --delete-chain\n" " -X [chain] Delete a user-defined chain\n" " --policy -P chain target\n" " Change policy on chain to target\n" " --rename-chain\n" " -E old-chain new-chain\n" " Change chain name, (moving any references)\n" "Options:\n" " --proto -p [!] proto protocol: by number or name, eg. `tcp'\n" " --source -s [!] address[/mask]\n" " source specification\n" " --destination -d [!] address[/mask]\n" " destination specification\n" " --in-interface -i [!] input name[+]\n" " network interface name ([+] for wildcard)\n" " --jump -j target\n" " target for rule (may load target extension)\n" " --match -m match\n" " extended match (may load extension)\n" " --numeric -n numeric output of addresses and ports\n" " --out-interface -o [!] output name[+]\n" " network interface name ([+] for wildcard)\n" " --table -t table table to manipulate (default: `filter')\n" " --verbose -v verbose mode\n" " --line-numbers print line numbers when listing\n" " --exact -x expand numbers (display exact values)\n" /*"[!] --fragment -f match second or further fragments only\n"*/ " --modprobe= try to insert modules using this command\n" " --set-counters PKTS BYTES set the counter during insert/append\n" "[!] --version -V print package version.\n"); /* Print out any special helps. A user might like to be able to add a --help to the commandline, and see expected results. So we call help for all specified matches & targets */ for (t = xtables_targets; t; t = t->next) { if (t->used) { printf("\n"); t->help(); } } for (matchp = matches; matchp; matchp = matchp->next) { printf("\n"); matchp->match->help(); } exit(0); } void exit_error(enum exittype status, const char *msg, ...) { va_list args; va_start(args, msg); fprintf(stderr, "%s v%s: ", program_name, program_version); vfprintf(stderr, msg, args); va_end(args); fprintf(stderr, "\n"); if (status == PARAMETER_PROBLEM) exit_tryhelp(status); if (status == VERSION_PROBLEM) fprintf(stderr, "Perhaps ip6tables or your kernel needs to be upgraded.\n"); /* On error paths, make sure that we don't leak memory */ free_opts(1); exit(status); } static void generic_opt_check(int command, int options) { int i, j, legal = 0; /* Check that commands are valid with options. Complicated by the * fact that if an option is legal with *any* command given, it is * legal overall (ie. -z and -l). */ for (i = 0; i < NUMBER_OF_OPT; i++) { legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */ for (j = 0; j < NUMBER_OF_CMD; j++) { if (!(command & (1< 1; option >>= 1, ptr++); return *ptr; } static char cmd2char(int option) { const char *ptr; for (ptr = cmdflags; option > 1; option >>= 1, ptr++); return *ptr; } static void add_command(unsigned int *cmd, const int newcmd, const int othercmds, int invert) { if (invert) exit_error(PARAMETER_PROBLEM, "unexpected ! flag"); if (*cmd & (~othercmds)) exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n", cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); *cmd |= newcmd; } int check_inverse(const char option[], int *invert, int *optind, int argc) { if (option && strcmp(option, "!") == 0) { if (*invert) exit_error(PARAMETER_PROBLEM, "Multiple `!' flags not allowed"); *invert = TRUE; if (optind) { *optind = *optind+1; if (argc && *optind > argc) exit_error(PARAMETER_PROBLEM, "no argument following `!'"); } return TRUE; } return FALSE; } static char * addr_to_numeric(const struct in6_addr *addrp) { /* 0000:0000:0000:0000:0000:000.000.000.000 * 0000:0000:0000:0000:0000:0000:0000:0000 */ static char buf[50+1]; return (char *)inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); } static struct in6_addr * numeric_to_addr(const char *num) { static struct in6_addr ap; int err; if ((err=inet_pton(AF_INET6, num, &ap)) == 1) return ≈ #ifdef DEBUG fprintf(stderr, "\nnumeric2addr: %d\n", err); #endif return (struct in6_addr *)NULL; } static struct in6_addr * host_to_addr(const char *name, unsigned int *naddr) { struct addrinfo hints; struct addrinfo *res; static struct in6_addr *addr; int err; memset(&hints, 0, sizeof(hints)); hints.ai_flags=AI_CANONNAME; hints.ai_family=AF_INET6; hints.ai_socktype=SOCK_RAW; hints.ai_protocol=41; hints.ai_next=NULL; *naddr = 0; if ( (err=getaddrinfo(name, NULL, &hints, &res)) != 0 ){ #ifdef DEBUG fprintf(stderr,"Name2IP: %s\n",gai_strerror(err)); #endif return (struct in6_addr *) NULL; } else { if (res->ai_family != AF_INET6 || res->ai_addrlen != sizeof(struct sockaddr_in6)) return (struct in6_addr *) NULL; #ifdef DEBUG fprintf(stderr, "resolved: len=%d %s ", res->ai_addrlen, addr_to_numeric(&(((struct sockaddr_in6 *)res->ai_addr)->sin6_addr))); #endif /* Get the first element of the address-chain */ addr = fw_calloc(1, sizeof(struct in6_addr)); in6addrcpy(addr, (struct in6_addr *) &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr); freeaddrinfo(res); *naddr = 1; return addr; } return (struct in6_addr *) NULL; } static char * addr_to_host(const struct in6_addr *addr) { struct sockaddr_in6 saddr; int err; static char hostname[NI_MAXHOST]; memset(&saddr, 0, sizeof(struct sockaddr_in6)); in6addrcpy(&(saddr.sin6_addr),(struct in6_addr *)addr); saddr.sin6_family = AF_INET6; if ( (err=getnameinfo((struct sockaddr *)&saddr, sizeof(struct sockaddr_in6), hostname, sizeof(hostname)-1, NULL, 0, 0)) != 0 ){ #ifdef DEBUG fprintf(stderr,"IP2Name: %s\n",gai_strerror(err)); #endif return (char *) NULL; } else { #ifdef DEBUG fprintf (stderr, "\naddr2host: %s\n", hostname); #endif return hostname; } return (char *) NULL; } static char * mask_to_numeric(const struct in6_addr *addrp) { static char buf[50+2]; int l = ipv6_prefix_length(addrp); if (l == -1) { strcpy(buf, "/"); strcat(buf, addr_to_numeric(addrp)); return buf; } sprintf(buf, "/%d", l); return buf; } static struct in6_addr * network_to_addr(const char *name) { /* abort();*/ /* TODO: not implemented yet, but the exception breaks the * name resolvation */ return (struct in6_addr *)NULL; } static char * addr_to_anyname(const struct in6_addr *addr) { char *name; if ((name = addr_to_host(addr)) != NULL) return name; return addr_to_numeric(addr); } /* * All functions starting with "parse" should succeed, otherwise * the program fails. * Most routines return pointers to static data that may change * between calls to the same or other routines with a few exceptions: * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask" * return global static data. */ static struct in6_addr * parse_hostnetwork(const char *name, unsigned int *naddrs) { struct in6_addr *addrp, *addrptmp; if ((addrptmp = numeric_to_addr(name)) != NULL || (addrptmp = network_to_addr(name)) != NULL) { addrp = fw_malloc(sizeof(struct in6_addr)); in6addrcpy(addrp, addrptmp); *naddrs = 1; return addrp; } if ((addrp = host_to_addr(name, naddrs)) != NULL) return addrp; exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name); } static struct in6_addr * parse_mask(char *mask) { static struct in6_addr maskaddr; struct in6_addr *addrp; unsigned int bits; if (mask == NULL) { /* no mask at all defaults to 128 bits */ memset(&maskaddr, 0xff, sizeof maskaddr); return &maskaddr; } if ((addrp = numeric_to_addr(mask)) != NULL) return addrp; if (string_to_number(mask, 0, 128, &bits) == -1) exit_error(PARAMETER_PROBLEM, "invalid mask `%s' specified", mask); if (bits != 0) { char *p = (char *)&maskaddr; memset(p, 0xff, bits / 8); memset(p + (bits / 8) + 1, 0, (128 - bits) / 8); p[bits / 8] = 0xff << (8 - (bits & 7)); return &maskaddr; } memset(&maskaddr, 0, sizeof maskaddr); return &maskaddr; } void parse_hostnetworkmask(const char *name, struct in6_addr **addrpp, struct in6_addr *maskp, unsigned int *naddrs) { struct in6_addr *addrp; char buf[256]; char *p; int i, j, n; strncpy(buf, name, sizeof(buf) - 1); buf[sizeof(buf) - 1] = '\0'; if ((p = strrchr(buf, '/')) != NULL) { *p = '\0'; addrp = parse_mask(p + 1); } else addrp = parse_mask(NULL); in6addrcpy(maskp, addrp); /* if a null mask is given, the name is ignored, like in "any/0" */ if (!memcmp(maskp, &in6addr_any, sizeof(in6addr_any))) strcpy(buf, "::"); addrp = *addrpp = parse_hostnetwork(buf, naddrs); n = *naddrs; for (i = 0, j = 0; i < n; i++) { int k; for (k = 0; k < 4; k++) addrp[j].in6_u.u6_addr32[k] &= maskp->in6_u.u6_addr32[k]; j++; for (k = 0; k < j - 1; k++) { if (IN6_ARE_ADDR_EQUAL(&addrp[k], &addrp[j - 1])) { (*naddrs)--; j--; break; } } } } /* Christophe Burki wants `-p 6' to imply `-m tcp'. */ static struct ip6tables_match * find_proto(const char *pname, enum ip6t_tryload tryload, int nolookup, struct ip6tables_rule_match **matches) { unsigned int proto; if (string_to_number(pname, 0, 255, &proto) != -1) { char *protoname = proto_to_name(proto, nolookup); if (protoname) return find_match(protoname, tryload, matches); } else return find_match(pname, tryload, matches); return NULL; } u_int16_t parse_protocol(const char *s) { unsigned int proto; if (string_to_number(s, 0, 255, &proto) == -1) { struct protoent *pent; /* first deal with the special case of 'all' to prevent * people from being able to redefine 'all' in nsswitch * and/or provoke expensive [not working] ldap/nis/... * lookups */ if (!strcmp(s, "all")) return 0; if ((pent = getprotobyname(s))) proto = pent->p_proto; else { unsigned int i; for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++) { if (strcmp(s, chain_protos[i].name) == 0) { proto = chain_protos[i].num; break; } } if (i == sizeof(chain_protos)/sizeof(struct pprot)) exit_error(PARAMETER_PROBLEM, "unknown protocol `%s' specified", s); } } return (u_int16_t)proto; } /* These are invalid numbers as upper layer protocol */ static int is_exthdr(u_int16_t proto) { return (proto == IPPROTO_ROUTING || proto == IPPROTO_FRAGMENT || proto == IPPROTO_AH || proto == IPPROTO_DSTOPTS); } /* Can't be zero. */ static int parse_rulenumber(const char *rule) { unsigned int rulenum; if (string_to_number(rule, 1, INT_MAX, &rulenum) == -1) exit_error(PARAMETER_PROBLEM, "Invalid rule number `%s'", rule); return rulenum; } static const char * parse_target(const char *targetname) { const char *ptr; if (strlen(targetname) < 1) exit_error(PARAMETER_PROBLEM, "Invalid target name (too short)"); if (strlen(targetname)+1 > sizeof(ip6t_chainlabel)) exit_error(PARAMETER_PROBLEM, "Invalid target name `%s' (%u chars max)", targetname, (unsigned int)sizeof(ip6t_chainlabel)-1); for (ptr = targetname; *ptr; ptr++) if (isspace(*ptr)) exit_error(PARAMETER_PROBLEM, "Invalid target name `%s'", targetname); return targetname; } static void set_option(unsigned int *options, unsigned int option, u_int8_t *invflg, int invert) { if (*options & option) exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", opt2char(option)); *options |= option; if (invert) { unsigned int i; for (i = 0; 1 << i != option; i++); if (!inverse_for_options[i]) exit_error(PARAMETER_PROBLEM, "cannot have ! before -%c", opt2char(option)); *invflg |= inverse_for_options[i]; } } static struct option * merge_options(struct option *oldopts, const struct option *newopts, unsigned int *option_offset) { unsigned int num_old, num_new, i; struct option *merge; if (newopts == NULL) return oldopts; for (num_old = 0; oldopts[num_old].name; num_old++); for (num_new = 0; newopts[num_new].name; num_new++); global_option_offset += OPTION_OFFSET; *option_offset = global_option_offset; merge = malloc(sizeof(struct option) * (num_new + num_old + 1)); memcpy(merge, oldopts, num_old * sizeof(struct option)); free_opts(0); /* Release previous options merged if any */ for (i = 0; i < num_new; i++) { merge[num_old + i] = newopts[i]; merge[num_old + i].val += *option_offset; } memset(merge + num_old + num_new, 0, sizeof(struct option)); return merge; } void register_match6(struct ip6tables_match *me) { me->family = AF_INET6; xtables_register_match(me); } void register_target6(struct ip6tables_target *me) { me->family = AF_INET6; xtables_register_target(me); } static void print_num(u_int64_t number, unsigned int format) { if (format & FMT_KILOMEGAGIGA) { if (number > 99999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; if (number > 9999) { number = (number + 500) / 1000; printf(FMT("%4lluT ","%lluT "), (unsigned long long)number); } else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number); } else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number); } else printf(FMT("%4lluK ","%lluK "), (unsigned long long)number); } else printf(FMT("%5llu ","%llu "), (unsigned long long)number); } else printf(FMT("%8llu ","%llu "), (unsigned long long)number); } static void print_header(unsigned int format, const char *chain, ip6tc_handle_t *handle) { struct ip6t_counters counters; const char *pol = ip6tc_get_policy(chain, &counters, handle); printf("Chain %s", chain); if (pol) { printf(" (policy %s", pol); if (!(format & FMT_NOCOUNTS)) { fputc(' ', stdout); print_num(counters.pcnt, (format|FMT_NOTABLE)); fputs("packets, ", stdout); print_num(counters.bcnt, (format|FMT_NOTABLE)); fputs("bytes", stdout); } printf(")\n"); } else { unsigned int refs; if (!ip6tc_get_references(&refs, chain, handle)) printf(" (ERROR obtaining refs)\n"); else printf(" (%u references)\n", refs); } if (format & FMT_LINENUMBERS) printf(FMT("%-4s ", "%s "), "num"); if (!(format & FMT_NOCOUNTS)) { if (format & FMT_KILOMEGAGIGA) { printf(FMT("%5s ","%s "), "pkts"); printf(FMT("%5s ","%s "), "bytes"); } else { printf(FMT("%8s ","%s "), "pkts"); printf(FMT("%10s ","%s "), "bytes"); } } if (!(format & FMT_NOTARGET)) printf(FMT("%-9s ","%s "), "target"); fputs(" prot ", stdout); if (format & FMT_OPTIONS) fputs("opt", stdout); if (format & FMT_VIA) { printf(FMT(" %-6s ","%s "), "in"); printf(FMT("%-6s ","%s "), "out"); } printf(FMT(" %-19s ","%s "), "source"); printf(FMT(" %-19s "," %s "), "destination"); printf("\n"); } static int print_match(const struct ip6t_entry_match *m, const struct ip6t_ip6 *ip, int numeric) { struct ip6tables_match *match = find_match(m->u.user.name, TRY_LOAD, NULL); if (match) { if (match->print) match->print(ip, m, numeric); else printf("%s ", match->name); } else { if (m->u.user.name[0]) printf("UNKNOWN match `%s' ", m->u.user.name); } /* Don't stop iterating. */ return 0; } /* e is called `fw' here for hysterical raisins */ static void print_firewall(const struct ip6t_entry *fw, const char *targname, unsigned int num, unsigned int format, const ip6tc_handle_t handle) { struct ip6tables_target *target = NULL; const struct ip6t_entry_target *t; u_int8_t flags; char buf[BUFSIZ]; if (!ip6tc_is_chain(targname, handle)) target = find_target(targname, TRY_LOAD); else target = find_target(IP6T_STANDARD_TARGET, LOAD_MUST_SUCCEED); t = ip6t_get_target((struct ip6t_entry *)fw); flags = fw->ipv6.flags; if (format & FMT_LINENUMBERS) printf(FMT("%-4u ", "%u "), num+1); if (!(format & FMT_NOCOUNTS)) { print_num(fw->counters.pcnt, format); print_num(fw->counters.bcnt, format); } if (!(format & FMT_NOTARGET)) printf(FMT("%-9s ", "%s "), targname); fputc(fw->ipv6.invflags & IP6T_INV_PROTO ? '!' : ' ', stdout); { char *pname = proto_to_name(fw->ipv6.proto, format&FMT_NUMERIC); if (pname) printf(FMT("%-5s", "%s "), pname); else printf(FMT("%-5hu", "%hu "), fw->ipv6.proto); } if (format & FMT_OPTIONS) { if (format & FMT_NOTABLE) fputs("opt ", stdout); fputc(' ', stdout); /* Invert flag of FRAG */ fputc(' ', stdout); /* -f */ fputc(' ', stdout); } if (format & FMT_VIA) { char iface[IFNAMSIZ+2]; if (fw->ipv6.invflags & IP6T_INV_VIA_IN) { iface[0] = '!'; iface[1] = '\0'; } else iface[0] = '\0'; if (fw->ipv6.iniface[0] != '\0') { strcat(iface, fw->ipv6.iniface); } else if (format & FMT_NUMERIC) strcat(iface, "*"); else strcat(iface, "any"); printf(FMT(" %-6s ","in %s "), iface); if (fw->ipv6.invflags & IP6T_INV_VIA_OUT) { iface[0] = '!'; iface[1] = '\0'; } else iface[0] = '\0'; if (fw->ipv6.outiface[0] != '\0') { strcat(iface, fw->ipv6.outiface); } else if (format & FMT_NUMERIC) strcat(iface, "*"); else strcat(iface, "any"); printf(FMT("%-6s ","out %s "), iface); } fputc(fw->ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout); if (!memcmp(&fw->ipv6.smsk, &in6addr_any, sizeof in6addr_any) && !(format & FMT_NUMERIC)) printf(FMT("%-19s ","%s "), "anywhere"); else { if (format & FMT_NUMERIC) sprintf(buf, "%s", addr_to_numeric(&(fw->ipv6.src))); else sprintf(buf, "%s", addr_to_anyname(&(fw->ipv6.src))); strcat(buf, mask_to_numeric(&(fw->ipv6.smsk))); printf(FMT("%-19s ","%s "), buf); } fputc(fw->ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout); if (!memcmp(&fw->ipv6.dmsk, &in6addr_any, sizeof in6addr_any) && !(format & FMT_NUMERIC)) printf(FMT("%-19s","-> %s"), "anywhere"); else { if (format & FMT_NUMERIC) sprintf(buf, "%s", addr_to_numeric(&(fw->ipv6.dst))); else sprintf(buf, "%s", addr_to_anyname(&(fw->ipv6.dst))); strcat(buf, mask_to_numeric(&(fw->ipv6.dmsk))); printf(FMT("%-19s","-> %s"), buf); } if (format & FMT_NOTABLE) fputs(" ", stdout); IP6T_MATCH_ITERATE(fw, print_match, &fw->ipv6, format & FMT_NUMERIC); if (target) { if (target->print) /* Print the target information. */ target->print(&fw->ipv6, t, format & FMT_NUMERIC); } else if (t->u.target_size != sizeof(*t)) printf("[%u bytes of unknown target data] ", (unsigned int)(t->u.target_size - sizeof(*t))); if (!(format & FMT_NONEWLINE)) fputc('\n', stdout); } static void print_firewall_line(const struct ip6t_entry *fw, const ip6tc_handle_t h) { struct ip6t_entry_target *t; t = ip6t_get_target((struct ip6t_entry *)fw); print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h); } static int append_entry(const ip6t_chainlabel chain, struct ip6t_entry *fw, unsigned int nsaddrs, const struct in6_addr saddrs[], unsigned int ndaddrs, const struct in6_addr daddrs[], int verbose, ip6tc_handle_t *handle) { unsigned int i, j; int ret = 1; for (i = 0; i < nsaddrs; i++) { fw->ipv6.src = saddrs[i]; for (j = 0; j < ndaddrs; j++) { fw->ipv6.dst = daddrs[j]; if (verbose) print_firewall_line(fw, *handle); ret &= ip6tc_append_entry(chain, fw, handle); } } return ret; } static int replace_entry(const ip6t_chainlabel chain, struct ip6t_entry *fw, unsigned int rulenum, const struct in6_addr *saddr, const struct in6_addr *daddr, int verbose, ip6tc_handle_t *handle) { fw->ipv6.src = *saddr; fw->ipv6.dst = *daddr; if (verbose) print_firewall_line(fw, *handle); return ip6tc_replace_entry(chain, fw, rulenum, handle); } static int insert_entry(const ip6t_chainlabel chain, struct ip6t_entry *fw, unsigned int rulenum, unsigned int nsaddrs, const struct in6_addr saddrs[], unsigned int ndaddrs, const struct in6_addr daddrs[], int verbose, ip6tc_handle_t *handle) { unsigned int i, j; int ret = 1; for (i = 0; i < nsaddrs; i++) { fw->ipv6.src = saddrs[i]; for (j = 0; j < ndaddrs; j++) { fw->ipv6.dst = daddrs[j]; if (verbose) print_firewall_line(fw, *handle); ret &= ip6tc_insert_entry(chain, fw, rulenum, handle); } } return ret; } static unsigned char * make_delete_mask(struct ip6t_entry *fw, struct ip6tables_rule_match *matches) { /* Establish mask for comparison */ unsigned int size; struct ip6tables_rule_match *matchp; unsigned char *mask, *mptr; size = sizeof(struct ip6t_entry); for (matchp = matches; matchp; matchp = matchp->next) size += IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + matchp->match->size; mask = fw_calloc(1, size + IP6T_ALIGN(sizeof(struct ip6t_entry_target)) + xtables_targets->size); memset(mask, 0xFF, sizeof(struct ip6t_entry)); mptr = mask + sizeof(struct ip6t_entry); for (matchp = matches; matchp; matchp = matchp->next) { memset(mptr, 0xFF, IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + matchp->match->userspacesize); mptr += IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + matchp->match->size; } memset(mptr, 0xFF, IP6T_ALIGN(sizeof(struct ip6t_entry_target)) + xtables_targets->userspacesize); return mask; } static int delete_entry(const ip6t_chainlabel chain, struct ip6t_entry *fw, unsigned int nsaddrs, const struct in6_addr saddrs[], unsigned int ndaddrs, const struct in6_addr daddrs[], int verbose, ip6tc_handle_t *handle, struct ip6tables_rule_match *matches) { unsigned int i, j; int ret = 1; unsigned char *mask; mask = make_delete_mask(fw, matches); for (i = 0; i < nsaddrs; i++) { fw->ipv6.src = saddrs[i]; for (j = 0; j < ndaddrs; j++) { fw->ipv6.dst = daddrs[j]; if (verbose) print_firewall_line(fw, *handle); ret &= ip6tc_delete_entry(chain, fw, mask, handle); } } free(mask); return ret; } int for_each_chain(int (*fn)(const ip6t_chainlabel, int, ip6tc_handle_t *), int verbose, int builtinstoo, ip6tc_handle_t *handle) { int ret = 1; const char *chain; char *chains; unsigned int i, chaincount = 0; chain = ip6tc_first_chain(handle); while (chain) { chaincount++; chain = ip6tc_next_chain(handle); } chains = fw_malloc(sizeof(ip6t_chainlabel) * chaincount); i = 0; chain = ip6tc_first_chain(handle); while (chain) { strcpy(chains + i*sizeof(ip6t_chainlabel), chain); i++; chain = ip6tc_next_chain(handle); } for (i = 0; i < chaincount; i++) { if (!builtinstoo && ip6tc_builtin(chains + i*sizeof(ip6t_chainlabel), *handle) == 1) continue; ret &= fn(chains + i*sizeof(ip6t_chainlabel), verbose, handle); } free(chains); return ret; } int flush_entries(const ip6t_chainlabel chain, int verbose, ip6tc_handle_t *handle) { if (!chain) return for_each_chain(flush_entries, verbose, 1, handle); if (verbose) fprintf(stdout, "Flushing chain `%s'\n", chain); return ip6tc_flush_entries(chain, handle); } static int zero_entries(const ip6t_chainlabel chain, int verbose, ip6tc_handle_t *handle) { if (!chain) return for_each_chain(zero_entries, verbose, 1, handle); if (verbose) fprintf(stdout, "Zeroing chain `%s'\n", chain); return ip6tc_zero_entries(chain, handle); } int delete_chain(const ip6t_chainlabel chain, int verbose, ip6tc_handle_t *handle) { if (!chain) return for_each_chain(delete_chain, verbose, 0, handle); if (verbose) fprintf(stdout, "Deleting chain `%s'\n", chain); return ip6tc_delete_chain(chain, handle); } static int list_entries(const ip6t_chainlabel chain, int verbose, int numeric, int expanded, int linenumbers, ip6tc_handle_t *handle) { int found = 0; unsigned int format; const char *this; format = FMT_OPTIONS; if (!verbose) format |= FMT_NOCOUNTS; else format |= FMT_VIA; if (numeric) format |= FMT_NUMERIC; if (!expanded) format |= FMT_KILOMEGAGIGA; if (linenumbers) format |= FMT_LINENUMBERS; for (this = ip6tc_first_chain(handle); this; this = ip6tc_next_chain(handle)) { const struct ip6t_entry *i; unsigned int num; if (chain && strcmp(chain, this) != 0) continue; if (found) printf("\n"); print_header(format, this, handle); i = ip6tc_first_rule(this, handle); num = 0; while (i) { print_firewall(i, ip6tc_get_target(i, handle), num++, format, *handle); i = ip6tc_next_rule(i, handle); } found = 1; } errno = ENOENT; return found; } static struct ip6t_entry * generate_entry(const struct ip6t_entry *fw, struct ip6tables_rule_match *matches, struct ip6t_entry_target *target) { unsigned int size; struct ip6tables_rule_match *matchp; struct ip6t_entry *e; size = sizeof(struct ip6t_entry); for (matchp = matches; matchp; matchp = matchp->next) size += matchp->match->m->u.match_size; e = fw_malloc(size + target->u.target_size); *e = *fw; e->target_offset = size; e->next_offset = size + target->u.target_size; size = 0; for (matchp = matches; matchp; matchp = matchp->next) { memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size); size += matchp->match->m->u.match_size; } memcpy(e->elems + size, target, target->u.target_size); return e; } void clear_rule_matches(struct ip6tables_rule_match **matches) { struct ip6tables_rule_match *matchp, *tmp; for (matchp = *matches; matchp;) { tmp = matchp->next; if (matchp->match->m) { free(matchp->match->m); matchp->match->m = NULL; } if (matchp->match == matchp->match->next) { free(matchp->match); matchp->match = NULL; } free(matchp); matchp = tmp; } *matches = NULL; } static void set_revision(char *name, u_int8_t revision) { /* Old kernel sources don't have ".revision" field, but we stole a byte from name. */ name[IP6T_FUNCTION_MAXNAMELEN - 2] = '\0'; name[IP6T_FUNCTION_MAXNAMELEN - 1] = revision; } int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle) { struct ip6t_entry fw, *e = NULL; int invert = 0; unsigned int nsaddrs = 0, ndaddrs = 0; struct in6_addr *saddrs = NULL, *daddrs = NULL; int c, verbose = 0; const char *chain = NULL; const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; const char *policy = NULL, *newname = NULL; unsigned int rulenum = 0, options = 0, command = 0; const char *pcnt = NULL, *bcnt = NULL; int ret = 1; struct ip6tables_match *m; struct ip6tables_rule_match *matches = NULL; struct ip6tables_rule_match *matchp; struct ip6tables_target *target = NULL; struct ip6tables_target *t; const char *jumpto = ""; char *protocol = NULL; int proto_used = 0; unsigned long long cnt; memset(&fw, 0, sizeof(fw)); /* re-set optind to 0 in case do_command gets called * a second time */ optind = 0; /* clear mflags in case do_command gets called a second time * (we clear the global list of all matches for security)*/ for (m = xtables_matches; m; m = m->next) m->mflags = 0; for (t = xtables_targets; t; t = t->next) { t->tflags = 0; t->used = 0; } /* Suppress error messages: we may add new options if we demand-load a protocol. */ opterr = 0; while ((c = getopt_long(argc, argv, "-A:D:R:I:L::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:bvnt:m:xc:", opts, NULL)) != -1) { switch (c) { /* * Command selection */ case 'A': add_command(&command, CMD_APPEND, CMD_NONE, invert); chain = optarg; break; case 'D': add_command(&command, CMD_DELETE, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') { rulenum = parse_rulenumber(argv[optind++]); command = CMD_DELETE_NUM; } break; case 'R': add_command(&command, CMD_REPLACE, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') rulenum = parse_rulenumber(argv[optind++]); else exit_error(PARAMETER_PROBLEM, "-%c requires a rule number", cmd2char(CMD_REPLACE)); break; case 'I': add_command(&command, CMD_INSERT, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') rulenum = parse_rulenumber(argv[optind++]); else rulenum = 1; break; case 'L': add_command(&command, CMD_LIST, CMD_ZERO, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'F': add_command(&command, CMD_FLUSH, CMD_NONE, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'Z': add_command(&command, CMD_ZERO, CMD_LIST, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'N': if (optarg && (*optarg == '-' || *optarg == '!')) exit_error(PARAMETER_PROBLEM, "chain name not allowed to start " "with `%c'\n", *optarg); if (find_target(optarg, TRY_LOAD)) exit_error(PARAMETER_PROBLEM, "chain name may not clash " "with target name\n"); add_command(&command, CMD_NEW_CHAIN, CMD_NONE, invert); chain = optarg; break; case 'X': add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, invert); if (optarg) chain = optarg; else if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') chain = argv[optind++]; break; case 'E': add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') newname = argv[optind++]; else exit_error(PARAMETER_PROBLEM, "-%c requires old-chain-name and " "new-chain-name", cmd2char(CMD_RENAME_CHAIN)); break; case 'P': add_command(&command, CMD_SET_POLICY, CMD_NONE, invert); chain = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') policy = argv[optind++]; else exit_error(PARAMETER_PROBLEM, "-%c requires a chain and a policy", cmd2char(CMD_SET_POLICY)); break; case 'h': if (!optarg) optarg = argv[optind]; /* ip6tables -p icmp -h */ if (!matches && protocol) find_match(protocol, TRY_LOAD, &matches); exit_printhelp(matches); /* * Option selection */ case 'p': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_PROTOCOL, &fw.ipv6.invflags, invert); /* Canonicalize into lower case */ for (protocol = argv[optind-1]; *protocol; protocol++) *protocol = tolower(*protocol); protocol = argv[optind-1]; fw.ipv6.proto = parse_protocol(protocol); fw.ipv6.flags |= IP6T_F_PROTO; if (fw.ipv6.proto == 0 && (fw.ipv6.invflags & IP6T_INV_PROTO)) exit_error(PARAMETER_PROBLEM, "rule would never match protocol"); if (is_exthdr(fw.ipv6.proto) && (fw.ipv6.invflags & IP6T_INV_PROTO) == 0) fprintf(stderr, "Warning: never matched protocol: %s. " "use extension match instead.\n", protocol); break; case 's': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_SOURCE, &fw.ipv6.invflags, invert); shostnetworkmask = argv[optind-1]; break; case 'd': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_DESTINATION, &fw.ipv6.invflags, invert); dhostnetworkmask = argv[optind-1]; break; case 'j': set_option(&options, OPT_JUMP, &fw.ipv6.invflags, invert); jumpto = parse_target(optarg); /* TRY_LOAD (may be chain name) */ target = find_target(jumpto, TRY_LOAD); if (target) { size_t size; size = IP6T_ALIGN(sizeof(struct ip6t_entry_target)) + target->size; target->t = fw_calloc(1, size); target->t->u.target_size = size; strcpy(target->t->u.user.name, jumpto); if (target->init != NULL) target->init(target->t); opts = merge_options(opts, target->extra_opts, &target->option_offset); } break; case 'i': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_VIANAMEIN, &fw.ipv6.invflags, invert); parse_interface(argv[optind-1], fw.ipv6.iniface, fw.ipv6.iniface_mask); break; case 'o': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_VIANAMEOUT, &fw.ipv6.invflags, invert); parse_interface(argv[optind-1], fw.ipv6.outiface, fw.ipv6.outiface_mask); break; case 'v': if (!verbose) set_option(&options, OPT_VERBOSE, &fw.ipv6.invflags, invert); verbose++; break; case 'm': { size_t size; if (invert) exit_error(PARAMETER_PROBLEM, "unexpected ! flag before --match"); m = find_match(optarg, LOAD_MUST_SUCCEED, &matches); size = IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + m->size; m->m = fw_calloc(1, size); m->m->u.match_size = size; strcpy(m->m->u.user.name, m->name); set_revision(m->m->u.user.name, m->revision); if (m->init != NULL) m->init(m->m); if (m != m->next) /* Merge options for non-cloned matches */ opts = merge_options(opts, m->extra_opts, &m->option_offset); } break; case 'n': set_option(&options, OPT_NUMERIC, &fw.ipv6.invflags, invert); break; case 't': if (invert) exit_error(PARAMETER_PROBLEM, "unexpected ! flag before --table"); *table = argv[optind-1]; break; case 'x': set_option(&options, OPT_EXPANDED, &fw.ipv6.invflags, invert); break; case 'V': if (invert) printf("Not %s ;-)\n", program_version); else printf("%s v%s\n", program_name, program_version); exit(0); case '0': set_option(&options, OPT_LINENUMBERS, &fw.ipv6.invflags, invert); break; case 'M': modprobe = optarg; break; case 'c': set_option(&options, OPT_COUNTERS, &fw.ipv6.invflags, invert); pcnt = optarg; if (optind < argc && argv[optind][0] != '-' && argv[optind][0] != '!') bcnt = argv[optind++]; else exit_error(PARAMETER_PROBLEM, "-%c requires packet and byte counter", opt2char(OPT_COUNTERS)); if (sscanf(pcnt, "%llu", (unsigned long long *)&cnt) != 1) exit_error(PARAMETER_PROBLEM, "-%c packet counter not numeric", opt2char(OPT_COUNTERS)); fw.counters.pcnt = cnt; if (sscanf(bcnt, "%llu", (unsigned long long *)&cnt) != 1) exit_error(PARAMETER_PROBLEM, "-%c byte counter not numeric", opt2char(OPT_COUNTERS)); fw.counters.bcnt = cnt; break; case 1: /* non option */ if (optarg[0] == '!' && optarg[1] == '\0') { if (invert) exit_error(PARAMETER_PROBLEM, "multiple consecutive ! not" " allowed"); invert = TRUE; optarg[0] = '\0'; continue; } fprintf(stderr, "Bad argument `%s'\n", optarg); exit_tryhelp(2); default: if (!target || !(target->parse(c - target->option_offset, argv, invert, &target->tflags, &fw, &target->t))) { for (matchp = matches; matchp; matchp = matchp->next) { if (matchp->completed) continue; if (matchp->match->parse(c - matchp->match->option_offset, argv, invert, &matchp->match->mflags, &fw, &matchp->match->m)) break; } m = matchp ? matchp->match : NULL; /* If you listen carefully, you can actually hear this code suck. */ /* some explanations (after four different bugs * in 3 different releases): If we encounter a * parameter, that has not been parsed yet, * it's not an option of an explicitly loaded * match or a target. However, we support * implicit loading of the protocol match * extension. '-p tcp' means 'l4 proto 6' and * at the same time 'load tcp protocol match on * demand if we specify --dport'. * * To make this work, we need to make sure: * - the parameter has not been parsed by * a match (m above) * - a protocol has been specified * - the protocol extension has not been * loaded yet, or is loaded and unused * [think of ip6tables-restore!] * - the protocol extension can be successively * loaded */ if (m == NULL && protocol && (!find_proto(protocol, DONT_LOAD, options&OPT_NUMERIC, NULL) || (find_proto(protocol, DONT_LOAD, options&OPT_NUMERIC, NULL) && (proto_used == 0)) ) && (m = find_proto(protocol, TRY_LOAD, options&OPT_NUMERIC, &matches))) { /* Try loading protocol */ size_t size; proto_used = 1; size = IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + m->size; m->m = fw_calloc(1, size); m->m->u.match_size = size; strcpy(m->m->u.user.name, m->name); set_revision(m->m->u.user.name, m->revision); if (m->init != NULL) m->init(m->m); opts = merge_options(opts, m->extra_opts, &m->option_offset); optind--; continue; } if (!m) exit_error(PARAMETER_PROBLEM, "Unknown arg `%s'", argv[optind-1]); } } invert = FALSE; } for (matchp = matches; matchp; matchp = matchp->next) if (matchp->match->final_check != NULL) matchp->match->final_check(matchp->match->mflags); if (target != NULL && target->final_check != NULL) target->final_check(target->tflags); /* Fix me: must put inverse options checking here --MN */ if (optind < argc) exit_error(PARAMETER_PROBLEM, "unknown arguments found on commandline"); if (!command) exit_error(PARAMETER_PROBLEM, "no command specified"); if (invert) exit_error(PARAMETER_PROBLEM, "nothing appropriate following !"); if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) { if (!(options & OPT_DESTINATION)) dhostnetworkmask = "::0/0"; if (!(options & OPT_SOURCE)) shostnetworkmask = "::0/0"; } if (shostnetworkmask) parse_hostnetworkmask(shostnetworkmask, &saddrs, &(fw.ipv6.smsk), &nsaddrs); if (dhostnetworkmask) parse_hostnetworkmask(dhostnetworkmask, &daddrs, &(fw.ipv6.dmsk), &ndaddrs); if ((nsaddrs > 1 || ndaddrs > 1) && (fw.ipv6.invflags & (IP6T_INV_SRCIP | IP6T_INV_DSTIP))) exit_error(PARAMETER_PROBLEM, "! not allowed with multiple" " source or destination IP addresses"); if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) exit_error(PARAMETER_PROBLEM, "Replacement rule does not " "specify a unique address"); generic_opt_check(command, options); if (chain && strlen(chain) > IP6T_FUNCTION_MAXNAMELEN) exit_error(PARAMETER_PROBLEM, "chain name `%s' too long (must be under %i chars)", chain, IP6T_FUNCTION_MAXNAMELEN); /* only allocate handle if we weren't called with a handle */ if (!*handle) *handle = ip6tc_init(*table); /* try to insmod the module if iptc_init failed */ if (!*handle && load_xtables_ko(modprobe, 0) != -1) *handle = ip6tc_init(*table); if (!*handle) exit_error(VERSION_PROBLEM, "can't initialize ip6tables table `%s': %s", *table, ip6tc_strerror(errno)); if (command == CMD_APPEND || command == CMD_DELETE || command == CMD_INSERT || command == CMD_REPLACE) { if (strcmp(chain, "PREROUTING") == 0 || strcmp(chain, "INPUT") == 0) { /* -o not valid with incoming packets. */ if (options & OPT_VIANAMEOUT) exit_error(PARAMETER_PROBLEM, "Can't use -%c with %s\n", opt2char(OPT_VIANAMEOUT), chain); } if (strcmp(chain, "POSTROUTING") == 0 || strcmp(chain, "OUTPUT") == 0) { /* -i not valid with outgoing packets */ if (options & OPT_VIANAMEIN) exit_error(PARAMETER_PROBLEM, "Can't use -%c with %s\n", opt2char(OPT_VIANAMEIN), chain); } if (target && ip6tc_is_chain(jumpto, *handle)) { fprintf(stderr, "Warning: using chain %s, not extension\n", jumpto); if (target->t) free(target->t); target = NULL; } /* If they didn't specify a target, or it's a chain name, use standard. */ if (!target && (strlen(jumpto) == 0 || ip6tc_is_chain(jumpto, *handle))) { size_t size; target = find_target(IP6T_STANDARD_TARGET, LOAD_MUST_SUCCEED); size = sizeof(struct ip6t_entry_target) + target->size; target->t = fw_calloc(1, size); target->t->u.target_size = size; strcpy(target->t->u.user.name, jumpto); if (target->init != NULL) target->init(target->t); } if (!target) { /* it is no chain, and we can't load a plugin. * We cannot know if the plugin is corrupt, non * existant OR if the user just misspelled a * chain. */ find_target(jumpto, LOAD_MUST_SUCCEED); } else { e = generate_entry(&fw, matches, target->t); free(target->t); } } switch (command) { case CMD_APPEND: ret = append_entry(chain, e, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_DELETE: ret = delete_entry(chain, e, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, handle, matches); break; case CMD_DELETE_NUM: ret = ip6tc_delete_num_entry(chain, rulenum - 1, handle); break; case CMD_REPLACE: ret = replace_entry(chain, e, rulenum - 1, saddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_INSERT: ret = insert_entry(chain, e, rulenum - 1, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, handle); break; case CMD_LIST: ret = list_entries(chain, options&OPT_VERBOSE, options&OPT_NUMERIC, options&OPT_EXPANDED, options&OPT_LINENUMBERS, handle); break; case CMD_FLUSH: ret = flush_entries(chain, options&OPT_VERBOSE, handle); break; case CMD_ZERO: ret = zero_entries(chain, options&OPT_VERBOSE, handle); break; case CMD_LIST|CMD_ZERO: ret = list_entries(chain, options&OPT_VERBOSE, options&OPT_NUMERIC, options&OPT_EXPANDED, options&OPT_LINENUMBERS, handle); if (ret) ret = zero_entries(chain, options&OPT_VERBOSE, handle); break; case CMD_NEW_CHAIN: ret = ip6tc_create_chain(chain, handle); break; case CMD_DELETE_CHAIN: ret = delete_chain(chain, options&OPT_VERBOSE, handle); break; case CMD_RENAME_CHAIN: ret = ip6tc_rename_chain(chain, newname, handle); break; case CMD_SET_POLICY: ret = ip6tc_set_policy(chain, policy, NULL, handle); break; default: /* We should never reach this... */ exit_tryhelp(2); } if (verbose > 1) dump_entries6(*handle); clear_rule_matches(&matches); if (e != NULL) { free(e); e = NULL; } for (c = 0; c < nsaddrs; c++) free(&saddrs[c]); for (c = 0; c < ndaddrs; c++) free(&daddrs[c]); free_opts(1); return ret; }