| /* Code to take an iptables-style command line and do it. */ |
| |
| /* |
| * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au |
| * |
| * (C) 2000-2002 by the netfilter coreteam <coreteam@netfilter.org>: |
| * Paul 'Rusty' Russell <rusty@rustcorp.com.au> |
| * Marc Boucher <marc+nf@mbsi.ca> |
| * James Morris <jmorris@intercode.com.au> |
| * Harald Welte <laforge@gnumonks.org> |
| * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> |
| * |
| * 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 <getopt.h> |
| #include <string.h> |
| #include <netdb.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <dlfcn.h> |
| #include <ctype.h> |
| #include <stdarg.h> |
| #include <limits.h> |
| #include <ip6tables.h> |
| #include <arpa/inet.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <sys/wait.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| |
| #ifndef TRUE |
| #define TRUE 1 |
| #endif |
| #ifndef FALSE |
| #define FALSE 0 |
| #endif |
| |
| #ifndef IP6T_LIB_DIR |
| #define IP6T_LIB_DIR "/usr/local/lib/iptables" |
| #endif |
| |
| #ifndef PROC_SYS_MODPROBE |
| #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe" |
| #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_CHECK 0x0800U |
| #define CMD_RENAME_CHAIN 0x1000U |
| #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', '3', '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; |
| |
| #ifndef __OPTIMIZE__ |
| struct ip6t_entry_target * |
| ip6t_get_target(struct ip6t_entry *e) |
| { |
| return (void *)e + e->target_offset; |
| } |
| #endif |
| |
| 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 */ |
| /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x'}, |
| /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x'}, |
| /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x'}, |
| /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x'}, |
| /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x'}, |
| /*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' '}, |
| /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x'}, |
| /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x'}, |
| /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x'}, |
| /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x'}, |
| /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x'}, |
| /*CHECK*/ {'x','+','+','+','x',' ','x',' ',' ','x'}, |
| /*RENAME*/ {'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 |
| }; |
| |
| const char *program_version; |
| const char *program_name; |
| |
| /* Keeping track of external matches and targets: linked lists. */ |
| struct ip6tables_match *ip6tables_matches = NULL; |
| struct ip6tables_target *ip6tables_targets = NULL; |
| |
| /* 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; |
| }; |
| |
| /* 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 |
| |
| static const struct pprot chain_protos[] = { |
| { "tcp", IPPROTO_TCP }, |
| { "udp", IPPROTO_UDP }, |
| { "icmpv6", IPPROTO_ICMPV6 }, |
| { "esp", IPPROTO_ESP }, |
| { "ah", IPPROTO_AH }, |
| { "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; */ |
| } |
| |
| void |
| exit_error(enum exittype status, 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 iptables or your kernel needs to be upgraded.\n"); |
| exit(status); |
| } |
| |
| 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 ); |
| exit(status); |
| } |
| |
| 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=<command> 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 = ip6tables_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); |
| } |
| |
| 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<<j))) |
| continue; |
| |
| if (!(options & (1<<i))) { |
| if (commands_v_options[j][i] == '+') |
| exit_error(PARAMETER_PROBLEM, |
| "You need to supply the `-%c' " |
| "option for this command\n", |
| optflags[i]); |
| } else { |
| if (commands_v_options[j][i] != 'x') |
| legal = 1; |
| else if (legal == 0) |
| legal = -1; |
| } |
| } |
| if (legal == -1) |
| exit_error(PARAMETER_PROBLEM, |
| "Illegal option `-%c' with this command\n", |
| optflags[i]); |
| } |
| } |
| |
| static char |
| opt2char(int option) |
| { |
| const char *ptr; |
| for (ptr = optflags; option > 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(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 void * |
| fw_calloc(size_t count, size_t size) |
| { |
| void *p; |
| |
| if ((p = calloc(count, size)) == NULL) { |
| perror("ip6tables: calloc failed"); |
| exit(1); |
| } |
| return p; |
| } |
| |
| static void * |
| fw_malloc(size_t size) |
| { |
| void *p; |
| |
| if ((p = malloc(size)) == NULL) { |
| perror("ip6tables: malloc failed"); |
| exit(1); |
| } |
| return p; |
| } |
| |
| 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; |
| } |
| } |
| } |
| } |
| |
| struct ip6tables_match * |
| find_match(const char *name, enum ip6t_tryload tryload, struct ip6tables_rule_match **matches) |
| { |
| struct ip6tables_match *ptr; |
| int icmphack = 0; |
| |
| /* This is ugly as hell. Nonetheless, there is no way of changing |
| * this without hurting backwards compatibility */ |
| if ( (strcmp(name,"icmpv6") == 0) || |
| (strcmp(name,"ipv6-icmp") == 0) || |
| (strcmp(name,"icmp6") == 0) ) icmphack = 1; |
| |
| if (!icmphack) { |
| for (ptr = ip6tables_matches; ptr; ptr = ptr->next) { |
| if (strcmp(name, ptr->name) == 0) |
| break; |
| } |
| } else { |
| for (ptr = ip6tables_matches; ptr; ptr = ptr->next) { |
| if (strcmp("icmp6", ptr->name) == 0) |
| break; |
| } |
| } |
| |
| #ifndef NO_SHARED_LIBS |
| if (!ptr && tryload != DONT_LOAD) { |
| char path[sizeof(IP6T_LIB_DIR) + sizeof("/libip6t_.so") |
| + strlen(name)]; |
| if (!icmphack) |
| sprintf(path, IP6T_LIB_DIR "/libip6t_%s.so", name); |
| else |
| sprintf(path, IP6T_LIB_DIR "/libip6t_%s.so", "icmpv6"); |
| if (dlopen(path, RTLD_NOW)) { |
| /* Found library. If it didn't register itself, |
| maybe they specified target as match. */ |
| ptr = find_match(name, DONT_LOAD, NULL); |
| |
| if (!ptr) |
| exit_error(PARAMETER_PROBLEM, |
| "Couldn't load match `%s'\n", |
| name); |
| } else if (tryload == LOAD_MUST_SUCCEED) |
| exit_error(PARAMETER_PROBLEM, |
| "Couldn't load match `%s':%s\n", |
| name, dlerror()); |
| } |
| #else |
| if (ptr && !ptr->loaded) { |
| if (tryload != DONT_LOAD) |
| ptr->loaded = 1; |
| else |
| ptr = NULL; |
| } |
| if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { |
| exit_error(PARAMETER_PROBLEM, |
| "Couldn't find match `%s'\n", name); |
| } |
| #endif |
| |
| if (ptr && matches) { |
| struct ip6tables_rule_match **i; |
| struct ip6tables_rule_match *newentry; |
| |
| newentry = fw_malloc(sizeof(struct ip6tables_rule_match)); |
| |
| for (i = matches; *i; i = &(*i)->next); |
| newentry->match = ptr; |
| newentry->next = NULL; |
| *i = newentry; |
| } |
| |
| return ptr; |
| } |
| |
| /* 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; |
| |
| 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; |
| } |
| |
| static void |
| parse_interface(const char *arg, char *vianame, unsigned char *mask) |
| { |
| int vialen = strlen(arg); |
| unsigned int i; |
| |
| memset(mask, 0, IFNAMSIZ); |
| memset(vianame, 0, IFNAMSIZ); |
| |
| if (vialen + 1 > IFNAMSIZ) |
| exit_error(PARAMETER_PROBLEM, |
| "interface name `%s' must be shorter than IFNAMSIZ" |
| " (%i)", arg, IFNAMSIZ-1); |
| |
| strcpy(vianame, arg); |
| if ((vialen == 0) || (vialen == 1 && vianame[0] == '+')) |
| memset(mask, 0, IFNAMSIZ); |
| else if (vianame[vialen - 1] == '+') { |
| memset(mask, 0xFF, vialen - 1); |
| memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1); |
| /* Don't remove `+' here! -HW */ |
| } else { |
| /* Include nul-terminator in match */ |
| memset(mask, 0xFF, vialen + 1); |
| memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1); |
| for (i = 0; vianame[i]; i++) { |
| if (!isalnum(vianame[i]) |
| && vianame[i] != '_' |
| && vianame[i] != '.') { |
| printf("Warning: wierd character in interface" |
| " `%s' (No aliases, :, ! or *).\n", |
| vianame); |
| break; |
| } |
| } |
| } |
| } |
| |
| /* 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; |
| } |
| |
| int |
| string_to_number_ll(const char *s, unsigned long long min, unsigned long long max, |
| unsigned long long *ret) |
| { |
| unsigned long long number; |
| char *end; |
| |
| /* Handle hex, octal, etc. */ |
| errno = 0; |
| number = strtoull(s, &end, 0); |
| if (*end == '\0' && end != s) { |
| /* we parsed a number, let's see if we want this */ |
| if (errno != ERANGE && min <= number && (!max || number <= max)) { |
| *ret = number; |
| return 0; |
| } |
| } |
| return -1; |
| } |
| |
| int |
| string_to_number_l(const char *s, unsigned long min, unsigned long max, |
| unsigned long *ret) |
| { |
| int result; |
| unsigned long long number; |
| |
| result = string_to_number_ll(s, min, max, &number); |
| *ret = (unsigned long)number; |
| |
| return result; |
| } |
| |
| int string_to_number(const char *s, unsigned int min, unsigned int max, |
| unsigned int *ret) |
| { |
| int result; |
| unsigned long number; |
| |
| result = string_to_number_l(s, min, max, &number); |
| *ret = (unsigned int)number; |
| |
| return result; |
| } |
| |
| 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]; |
| } |
| } |
| |
| struct ip6tables_target * |
| find_target(const char *name, enum ip6t_tryload tryload) |
| { |
| struct ip6tables_target *ptr; |
| |
| /* Standard target? */ |
| if (strcmp(name, "") == 0 |
| || strcmp(name, IP6TC_LABEL_ACCEPT) == 0 |
| || strcmp(name, IP6TC_LABEL_DROP) == 0 |
| || strcmp(name, IP6TC_LABEL_QUEUE) == 0 |
| || strcmp(name, IP6TC_LABEL_RETURN) == 0) |
| name = "standard"; |
| |
| for (ptr = ip6tables_targets; ptr; ptr = ptr->next) { |
| if (strcmp(name, ptr->name) == 0) |
| break; |
| } |
| |
| #ifndef NO_SHARED_LIBS |
| if (!ptr && tryload != DONT_LOAD) { |
| char path[sizeof(IP6T_LIB_DIR) + sizeof("/libip6t_.so") |
| + strlen(name)]; |
| sprintf(path, IP6T_LIB_DIR "/libip6t_%s.so", name); |
| if (dlopen(path, RTLD_NOW)) { |
| /* Found library. If it didn't register itself, |
| maybe they specified match as a target. */ |
| ptr = find_target(name, DONT_LOAD); |
| if (!ptr) |
| exit_error(PARAMETER_PROBLEM, |
| "Couldn't load target `%s'\n", |
| name); |
| } else if (tryload == LOAD_MUST_SUCCEED) |
| exit_error(PARAMETER_PROBLEM, |
| "Couldn't load target `%s':%s\n", |
| name, dlerror()); |
| } |
| #else |
| if (ptr && !ptr->loaded) { |
| if (tryload != DONT_LOAD) |
| ptr->loaded = 1; |
| else |
| ptr = NULL; |
| } |
| if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { |
| exit_error(PARAMETER_PROBLEM, |
| "Couldn't find target `%s'\n", name); |
| } |
| #endif |
| |
| if (ptr) |
| ptr->used = 1; |
| |
| return ptr; |
| } |
| |
| 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; |
| |
| 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)); |
| 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) |
| { |
| struct ip6tables_match **i; |
| |
| if (strcmp(me->version, program_version) != 0) { |
| fprintf(stderr, "%s: match `%s' v%s (I'm v%s).\n", |
| program_name, me->name, me->version, program_version); |
| exit(1); |
| } |
| |
| if (find_match(me->name, DONT_LOAD, NULL)) { |
| fprintf(stderr, "%s: match `%s' already registered.\n", |
| program_name, me->name); |
| exit(1); |
| } |
| |
| if (me->size != IP6T_ALIGN(me->size)) { |
| fprintf(stderr, "%s: match `%s' has invalid size %u.\n", |
| program_name, me->name, (unsigned int)me->size); |
| exit(1); |
| } |
| |
| /* Append to list. */ |
| for (i = &ip6tables_matches; *i; i = &(*i)->next); |
| me->next = NULL; |
| *i = me; |
| |
| me->m = NULL; |
| me->mflags = 0; |
| } |
| |
| void |
| register_target6(struct ip6tables_target *me) |
| { |
| if (strcmp(me->version, program_version) != 0) { |
| fprintf(stderr, "%s: target `%s' v%s (I'm v%s).\n", |
| program_name, me->name, me->version, program_version); |
| exit(1); |
| } |
| |
| if (find_target(me->name, DONT_LOAD)) { |
| fprintf(stderr, "%s: target `%s' already registered.\n", |
| program_name, me->name); |
| exit(1); |
| } |
| |
| if (me->size != IP6T_ALIGN(me->size)) { |
| fprintf(stderr, "%s: target `%s' has invalid size %u.\n", |
| program_name, me->name, (unsigned int)me->size); |
| exit(1); |
| } |
| |
| /* Prepend to list. */ |
| me->next = ip6tables_targets; |
| ip6tables_targets = me; |
| me->t = NULL; |
| me->tflags = 0; |
| } |
| |
| 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)) |
| + ip6tables_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)) |
| + ip6tables_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 char *get_modprobe(void) |
| { |
| int procfile; |
| char *ret; |
| |
| procfile = open(PROC_SYS_MODPROBE, O_RDONLY); |
| if (procfile < 0) |
| return NULL; |
| |
| ret = malloc(1024); |
| if (ret) { |
| switch (read(procfile, ret, 1024)) { |
| case -1: goto fail; |
| case 1024: goto fail; /* Partial read. Wierd */ |
| } |
| if (ret[strlen(ret)-1]=='\n') |
| ret[strlen(ret)-1]=0; |
| close(procfile); |
| return ret; |
| } |
| fail: |
| free(ret); |
| close(procfile); |
| return NULL; |
| } |
| |
| int ip6tables_insmod(const char *modname, const char *modprobe) |
| { |
| char *buf = NULL; |
| char *argv[3]; |
| |
| /* If they don't explicitly set it, read out of kernel */ |
| if (!modprobe) { |
| buf = get_modprobe(); |
| if (!buf) |
| return -1; |
| modprobe = buf; |
| } |
| |
| switch (fork()) { |
| case 0: |
| argv[0] = (char *)modprobe; |
| argv[1] = (char *)modname; |
| argv[2] = NULL; |
| execv(argv[0], argv); |
| |
| /* not usually reached */ |
| exit(0); |
| case -1: |
| return -1; |
| |
| default: /* parent */ |
| wait(NULL); |
| } |
| |
| free(buf); |
| return 0; |
| } |
| |
| 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); |
| free(matchp); |
| matchp = tmp; |
| } |
| |
| *matches = NULL; |
| } |
| |
| 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; |
| const char *modprobe = NULL; |
| int proto_used = 0; |
| char icmp6p[] = "icmpv6"; |
| |
| 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 = ip6tables_matches; m; m = m->next) |
| m->mflags = 0; |
| |
| for (t = ip6tables_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 == '-') |
| exit_error(PARAMETER_PROBLEM, |
| "chain name not allowed to start " |
| "with `-'\n"); |
| 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]; |
| |
| /* iptables -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]; |
| if ( strcmp(protocol,"ipv6-icmp") == 0) |
| protocol = icmp6p; |
| 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"); |
| fw.nfcache |= NFC_IP6_PROTO; |
| break; |
| |
| case 's': |
| check_inverse(optarg, &invert, &optind, argc); |
| set_option(&options, OPT_SOURCE, &fw.ipv6.invflags, |
| invert); |
| shostnetworkmask = argv[optind-1]; |
| fw.nfcache |= NFC_IP6_SRC; |
| break; |
| |
| case 'd': |
| check_inverse(optarg, &invert, &optind, argc); |
| set_option(&options, OPT_DESTINATION, &fw.ipv6.invflags, |
| invert); |
| dhostnetworkmask = argv[optind-1]; |
| fw.nfcache |= NFC_IP6_DST; |
| 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); |
| target->init(target->t, &fw.nfcache); |
| 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); |
| fw.nfcache |= NFC_IP6_IF_IN; |
| 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); |
| fw.nfcache |= NFC_IP6_IF_OUT; |
| 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); |
| m->init(m->m, &fw.nfcache); |
| 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 *)&fw.counters.pcnt) != 1) |
| exit_error(PARAMETER_PROBLEM, |
| "-%c packet counter not numeric", |
| opt2char(OPT_COUNTERS)); |
| |
| if (sscanf(bcnt, "%llu", (unsigned long long *)&fw.counters.bcnt) != 1) |
| exit_error(PARAMETER_PROBLEM, |
| "-%c byte counter not numeric", |
| opt2char(OPT_COUNTERS)); |
| |
| 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; |
| } |
| printf("Bad argument `%s'\n", optarg); |
| exit_tryhelp(2); |
| |
| default: |
| /* FIXME: This scheme doesn't allow two of the same |
| matches --RR */ |
| if (!target |
| || !(target->parse(c - target->option_offset, |
| argv, invert, |
| &target->tflags, |
| &fw, &target->t))) { |
| for (matchp = matches; matchp; matchp = matchp->next) { |
| if (matchp->match->parse(c - matchp->match->option_offset, |
| argv, invert, |
| &matchp->match->mflags, |
| &fw, |
| &fw.nfcache, |
| &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 encountere 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 iptables-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); |
| m->init(m->m, &fw.nfcache); |
| |
| 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) |
| matchp->match->final_check(matchp->match->mflags); |
| |
| if (target) |
| 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); |
| |
| if (!*handle) { |
| /* try to insmod the module if iptc_init failed */ |
| ip6tables_insmod("ip6_tables", modprobe); |
| *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)) { |
| printf("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); |
| target->init(target->t, &fw.nfcache); |
| } |
| |
| 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]); |
| |
| if (opts != original_opts) { |
| free(opts); |
| opts = original_opts; |
| global_option_offset = 0; |
| } |
| |
| return ret; |
| } |