From 84909d171585d77fe769f03e2b1b96eab0aa0213 Mon Sep 17 00:00:00 2001 From: Giuseppe Longo Date: Mon, 9 Sep 2013 12:54:04 +0200 Subject: xtables: bootstrap ARP compatibility layer for nftables This patch bootstraps ARP support for the compatibility layer: 1) copy original arptables code into xtables-arp.c 2) adapt it to fit into the existing nft infrastructure. 3) add the builtin table/chains for ARP. 4) add necessary parts so xtables-multi can provide xtables-arp. 5) add basic support for rule addition (-A), insertion (-I) and listing (-L). [ This was originally posted in a series of patches with interdependencies that I have collapsed to leave the repository in consistent state. This patch includes the following changes I made: * Rename from xtables-arptables to xtables-arp, previous name too long. * Remove nft-arptables.c, now we have one single nft-arp.c file. Moved specific ARP functions to nft.c. Those should go away at some point as some refactorization should allow to accomodate those functions to the existing infrastructure. * Fix --opcode Request/Reply, so we can do something useful with this like dropping ARP request/replies. --pablo ] Signed-off-by: Giuseppe Longo Signed-off-by: Tomasz Bursztyka Signed-off-by: Pablo Neira Ayuso --- iptables/xtables-arp.c | 1457 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1457 insertions(+) create mode 100644 iptables/xtables-arp.c (limited to 'iptables/xtables-arp.c') diff --git a/iptables/xtables-arp.c b/iptables/xtables-arp.c new file mode 100644 index 00000000..68687c0e --- /dev/null +++ b/iptables/xtables-arp.c @@ -0,0 +1,1457 @@ +/* Code to take an arptables-style command line and do it. */ + +/* + * arptables: + * Author: Bart De Schuymer , but + * almost all code is from the iptables userspace program, which has main + * authors: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au + * + * 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. + */ + +/* + Currently, only support for specifying hardware addresses for Ethernet + is available. + This tool is not luser-proof: you can specify an Ethernet source address + and set hardware length to something different than 6, f.e. +*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "xshared.h" + +#include "nft.h" +#include + +typedef char arpt_chainlabel[32]; + +#ifndef TRUE +#define TRUE 1 +#endif +#ifndef FALSE +#define FALSE 0 +#endif + +/* XXX: command defined by nft-shared.h do not overlap with these two */ +#undef CMD_CHECK +#undef CMD_RENAME_CHAIN + +#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_S_IP 0x00002U +#define OPT_D_IP 0x00004U +#define OPT_S_MAC 0x00008U +#define OPT_D_MAC 0x00010U +#define OPT_H_LENGTH 0x00020U +#define OPT_P_LENGTH 0x00040U +#define OPT_OPCODE 0x00080U +#define OPT_H_TYPE 0x00100U +#define OPT_P_TYPE 0x00200U +#define OPT_JUMP 0x00400U +#define OPT_VERBOSE 0x00800U +#define OPT_VIANAMEIN 0x01000U +#define OPT_VIANAMEOUT 0x02000U +#define OPT_LINENUMBERS 0x04000U +#define OPT_COUNTERS 0x08000U +#define NUMBER_OF_OPT 16 +static const char optflags[NUMBER_OF_OPT] += { 'n', 's', 'd', 2, 3, 7, 8, 4, 5, 6, 'j', 'v', '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-ip", 1, 0, 's' }, + { "destination-ip", 1, 0, 'd' }, + { "src-ip", 1, 0, 's' }, + { "dst-ip", 1, 0, 'd' }, + { "source-mac", 1, 0, 2}, + { "destination-mac", 1, 0, 3}, + { "src-mac", 1, 0, 2}, + { "dst-mac", 1, 0, 3}, + { "h-length", 1, 0, 'l' }, + { "p-length", 1, 0, 8 }, + { "opcode", 1, 0, 4 }, + { "h-type", 1, 0, 5 }, + { "proto-type", 1, 0, 6 }, + { "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' }, + { 0 } +}; + +int RUNTIME_NF_ARP_NUMHOOKS = 3; + +static struct option *opts = original_opts; +static unsigned int global_option_offset = 0; + +extern void xtables_exit_error(enum xtables_exittype status, const char *msg, ...); +extern struct xtables_globals xtables_globals; + +/* 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 -f --line */ +/*INSERT*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*DELETE*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*DELETE_NUM*/{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*REPLACE*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*APPEND*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*LIST*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*FLUSH*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*ZERO*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*NEW_CHAIN*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*DEL_CHAIN*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*SET_POLICY*/{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*CHECK*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}, +/*RENAME*/ {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '} +}; + +static int inverse_for_options[NUMBER_OF_OPT] = +{ +/* -n */ 0, +/* -s */ ARPT_INV_SRCIP, +/* -d */ ARPT_INV_TGTIP, +/* 2 */ ARPT_INV_SRCDEVADDR, +/* 3 */ ARPT_INV_TGTDEVADDR, +/* -l */ ARPT_INV_ARPHLN, +/* 8 */ 0, +/* 4 */ ARPT_INV_ARPOP, +/* 5 */ ARPT_INV_ARPHRD, +/* 6 */ ARPT_INV_ARPPRO, +/* -j */ 0, +/* -v */ 0, +/* -i */ ARPT_INV_VIA_IN, +/* -o */ ARPT_INV_VIA_OUT, +/*--line*/ 0, +/* -c */ 0, +}; + +const char *program_version = XTABLES_VERSION; +const char *program_name = "xtables-arp"; + +/* 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 + +/***********************************************/ +/* ARPTABLES SPECIFIC NEW FUNCTIONS ADDED HERE */ +/***********************************************/ + +unsigned char mac_type_unicast[ETH_ALEN] = {0,0,0,0,0,0}; +unsigned char msk_type_unicast[ETH_ALEN] = {1,0,0,0,0,0}; +unsigned char mac_type_multicast[ETH_ALEN] = {1,0,0,0,0,0}; +unsigned char msk_type_multicast[ETH_ALEN] = {1,0,0,0,0,0}; +unsigned char mac_type_broadcast[ETH_ALEN] = {255,255,255,255,255,255}; +unsigned char msk_type_broadcast[ETH_ALEN] = {255,255,255,255,255,255}; + +/* + * put the mac address into 6 (ETH_ALEN) bytes + */ +static int getmac_and_mask(char *from, char *to, char *mask) +{ + char *p; + int i; + struct ether_addr *addr; + + if (strcasecmp(from, "Unicast") == 0) { + memcpy(to, mac_type_unicast, ETH_ALEN); + memcpy(mask, msk_type_unicast, ETH_ALEN); + return 0; + } + if (strcasecmp(from, "Multicast") == 0) { + memcpy(to, mac_type_multicast, ETH_ALEN); + memcpy(mask, msk_type_multicast, ETH_ALEN); + return 0; + } + if (strcasecmp(from, "Broadcast") == 0) { + memcpy(to, mac_type_broadcast, ETH_ALEN); + memcpy(mask, msk_type_broadcast, ETH_ALEN); + return 0; + } + if ( (p = strrchr(from, '/')) != NULL) { + *p = '\0'; + if (!(addr = ether_aton(p + 1))) + return -1; + memcpy(mask, addr, ETH_ALEN); + } else + memset(mask, 0xff, ETH_ALEN); + if (!(addr = ether_aton(from))) + return -1; + memcpy(to, addr, ETH_ALEN); + for (i = 0; i < ETH_ALEN; i++) + to[i] &= mask[i]; + return 0; +} + +static int getlength_and_mask(char *from, uint8_t *to, uint8_t *mask) +{ + char *p, *buffer; + int i; + + if ( (p = strrchr(from, '/')) != NULL) { + *p = '\0'; + i = strtol(p+1, &buffer, 10); + if (*buffer != '\0' || i < 0 || i > 255) + return -1; + *mask = (uint8_t)i; + } else + *mask = 255; + i = strtol(from, &buffer, 10); + if (*buffer != '\0' || i < 0 || i > 255) + return -1; + *to = (uint8_t)i; + return 0; +} + +static int get16_and_mask(char *from, uint16_t *to, uint16_t *mask, int base) +{ + char *p, *buffer; + int i; + + if ( (p = strrchr(from, '/')) != NULL) { + *p = '\0'; + i = strtol(p+1, &buffer, base); + if (*buffer != '\0' || i < 0 || i > 65535) + return -1; + *mask = htons((uint16_t)i); + } else + *mask = 65535; + i = strtol(from, &buffer, base); + if (*buffer != '\0' || i < 0 || i > 65535) + return -1; + *to = htons((uint16_t)i); + return 0; +} + +static int +string_to_number(const char *s, unsigned int min, unsigned int max, + unsigned int *ret) +{ + long number; + char *end; + + /* Handle hex, octal, etc. */ + errno = 0; + number = strtol(s, &end, 0); + if (*end == '\0' && end != s) { + /* we parsed a number, let's see if we want this */ + if (errno != ERANGE && min <= number && number <= max) { + *ret = number; + return 0; + } + } + return -1; +} + +/*********************************************/ +/* ARPTABLES SPECIFIC NEW FUNCTIONS END HERE */ +/*********************************************/ + +static struct in_addr * +dotted_to_addr(const char *dotted) +{ + static struct in_addr addr; + unsigned char *addrp; + char *p, *q; + unsigned int onebyte; + int i; + char buf[20]; + + /* copy dotted string, because we need to modify it */ + strncpy(buf, dotted, sizeof(buf) - 1); + addrp = (unsigned char *) &(addr.s_addr); + + p = buf; + for (i = 0; i < 3; i++) { + if ((q = strchr(p, '.')) == NULL) + return (struct in_addr *) NULL; + + *q = '\0'; + if (string_to_number(p, 0, 255, &onebyte) == -1) + return (struct in_addr *) NULL; + + addrp[i] = (unsigned char) onebyte; + p = q + 1; + } + + /* we've checked 3 bytes, now we check the last one */ + if (string_to_number(p, 0, 255, &onebyte) == -1) + return (struct in_addr *) NULL; + + addrp[3] = (unsigned char) onebyte; + + return &addr; +} + +static struct in_addr * +network_to_addr(const char *name) +{ + struct netent *net; + static struct in_addr addr; + + if ((net = getnetbyname(name)) != NULL) { + if (net->n_addrtype != AF_INET) + return (struct in_addr *) NULL; + addr.s_addr = htonl((unsigned long) net->n_net); + return &addr; + } + + return (struct in_addr *) NULL; +} + +static void +inaddrcpy(struct in_addr *dst, struct in_addr *src) +{ + /* memcpy(dst, src, sizeof(struct in_addr)); */ + dst->s_addr = src->s_addr; +} + +static void +exit_tryhelp(int status) +{ + fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", + program_name, program_name ); + exit(status); +} + +static void +exit_printhelp(void) +{ + struct xtables_target *t = NULL; + int i; + + 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" +" --source-ip -s [!] address[/mask]\n" +" source specification\n" +" --destination-ip -d [!] address[/mask]\n" +" destination specification\n" +" --source-mac [!] address[/mask]\n" +" --destination-mac [!] address[/mask]\n" +" --h-length -l length[/mask] hardware length (nr of bytes)\n" +" --opcode code[/mask] operation code (2 bytes)\n" +" --h-type type[/mask] hardware type (2 bytes, hexadecimal)\n" +" --proto-type type[/mask] protocol type (2 bytes)\n" +" --in-interface -i [!] input name[+]\n" +" network interface name ([+] for wildcard)\n" +" --out-interface -o [!] output 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" +" --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" +" --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"); + printf(" opcode strings: \n"); + for (i = 0; i < NUMOPCODES; i++) + printf(" %d = %s\n", i + 1, opcodes[i]); + printf( +" hardware type string: 1 = Ethernet\n" +" protocol type string: 0x800 = IPv4\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 matches & targets */ + for (t = xtables_targets; t; t = t->next) { + if (strcmp(t->name, "CLASSIFY") && strcmp(t->name, "mangle")) + continue; + printf("\n"); + t->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< 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 unsigned int othercmds, int invert) +{ + if (invert) + xtables_error(PARAMETER_PROBLEM, "unexpected ! flag"); + if (*cmd & (~othercmds)) + xtables_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n", + cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); + *cmd |= newcmd; +} + +static int +check_inverse(const char option[], int *invert, int *optind, int argc) +{ + if (option && strcmp(option, "!") == 0) { + if (*invert) + xtables_error(PARAMETER_PROBLEM, + "Multiple `!' flags not allowed"); + *invert = TRUE; + if (optind) { + *optind = *optind+1; + if (argc && *optind > argc) + xtables_error(PARAMETER_PROBLEM, + "no argument following `!'"); + } + + return TRUE; + } + return FALSE; +} + +static struct in_addr * +host_to_addr(const char *name, unsigned int *naddr) +{ + struct hostent *host; + struct in_addr *addr; + unsigned int i; + + *naddr = 0; + if ((host = gethostbyname(name)) != NULL) { + if (host->h_addrtype != AF_INET || + host->h_length != sizeof(struct in_addr)) + return (struct in_addr *) NULL; + + while (host->h_addr_list[*naddr] != (char *) NULL) + (*naddr)++; + addr = xtables_calloc(*naddr, sizeof(struct in_addr)); + for (i = 0; i < *naddr; i++) + inaddrcpy(&(addr[i]), + (struct in_addr *) host->h_addr_list[i]); + return addr; + } + + return (struct in_addr *) NULL; +} + +/* + * 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 in_addr * +parse_hostnetwork(const char *name, unsigned int *naddrs) +{ + struct in_addr *addrp, *addrptmp; + + if ((addrptmp = dotted_to_addr(name)) != NULL || + (addrptmp = network_to_addr(name)) != NULL) { + addrp = xtables_malloc(sizeof(struct in_addr)); + inaddrcpy(addrp, addrptmp); + *naddrs = 1; + return addrp; + } + if ((addrp = host_to_addr(name, naddrs)) != NULL) + return addrp; + + xtables_error(PARAMETER_PROBLEM, "host/network `%s' not found", name); +} + +static struct in_addr * +parse_mask(char *mask) +{ + static struct in_addr maskaddr; + struct in_addr *addrp; + unsigned int bits; + + if (mask == NULL) { + /* no mask at all defaults to 32 bits */ + maskaddr.s_addr = 0xFFFFFFFF; + return &maskaddr; + } + if ((addrp = dotted_to_addr(mask)) != NULL) + /* dotted_to_addr already returns a network byte order addr */ + return addrp; + if (string_to_number(mask, 0, 32, &bits) == -1) + xtables_error(PARAMETER_PROBLEM, + "invalid mask `%s' specified", mask); + if (bits != 0) { + maskaddr.s_addr = htonl(0xFFFFFFFF << (32 - bits)); + return &maskaddr; + } + + maskaddr.s_addr = 0L; + return &maskaddr; +} + +static void +parse_hostnetworkmask(const char *name, struct in_addr **addrpp, + struct in_addr *maskp, unsigned int *naddrs) +{ + struct in_addr *addrp; + char buf[256]; + char *p; + int i, j, k, n; + + strncpy(buf, name, sizeof(buf) - 1); + if ((p = strrchr(buf, '/')) != NULL) { + *p = '\0'; + addrp = parse_mask(p + 1); + } else + addrp = parse_mask(NULL); + inaddrcpy(maskp, addrp); + + /* if a null mask is given, the name is ignored, like in "any/0" */ + if (maskp->s_addr == 0L) + strcpy(buf, "0.0.0.0"); + + addrp = *addrpp = parse_hostnetwork(buf, naddrs); + n = *naddrs; + for (i = 0, j = 0; i < n; i++) { + addrp[j++].s_addr &= maskp->s_addr; + for (k = 0; k < j - 1; k++) { + if (addrp[k].s_addr == addrp[j - 1].s_addr) { + (*naddrs)--; + j--; + break; + } + } + } +} + +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) + xtables_error(PARAMETER_PROBLEM, + "interface name `%s' must be shorter than IFNAMSIZ" + " (%i)", arg, IFNAMSIZ-1); + + strcpy(vianame, arg); + if (vialen == 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) + xtables_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) + xtables_error(PARAMETER_PROBLEM, + "Invalid target name (too short)"); + + if (strlen(targetname)+1 > sizeof(arpt_chainlabel)) + xtables_error(PARAMETER_PROBLEM, + "Invalid target name `%s' (%zu chars max)", + targetname, sizeof(arpt_chainlabel)-1); + + for (ptr = targetname; *ptr; ptr++) + if (isspace(*ptr)) + xtables_error(PARAMETER_PROBLEM, + "Invalid target name `%s'", targetname); + return targetname; +} + +static void +set_option(unsigned int *options, unsigned int option, u_int16_t *invflg, + int invert) +{ + if (*options & option) + xtables_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]) + xtables_error(PARAMETER_PROBLEM, + "cannot have ! before -%c", + opt2char(option)); + *invflg |= inverse_for_options[i]; + } +} + +static int +list_entries(struct nft_handle *h, const char *chain, const char *table, + int rulenum, int verbose, int numeric, int expanded, + int linenumbers) +{ + unsigned int format; + + 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; + + return nft_rule_list(h, chain, table, rulenum, format); +} + +static struct arpt_entry * +generate_entry(const struct arpt_entry *fw, + struct arpt_entry_target *target) +{ + struct arpt_entry_target **t; + struct arpt_entry *e; + unsigned int size; + + + size = sizeof(struct arpt_entry); + + e = xtables_malloc(size + target->u.target_size); + *e = *fw; + e->target_offset = size; + e->next_offset = size + target->u.target_size; + + t = (void *) e + e->target_offset; + *t = target; + + return e; +} + +static struct xtables_target *command_jump(struct arpt_entry *fw, + const char *jumpto) +{ + struct xtables_target *target; + size_t size; + + /* XTF_TRY_LOAD (may be chain name) */ + target = xtables_find_target(jumpto, XTF_TRY_LOAD); + + if (!target) + return NULL; + + size = XT_ALIGN(sizeof(struct xt_entry_target)) + + target->size; + + target->t = xtables_calloc(1, size); + target->t->u.target_size = size; + strcpy(target->t->u.user.name, jumpto); + target->t->u.user.revision = target->revision; + + xs_init_target(target); + + if (target->x6_options != NULL) + opts = xtables_options_xfrm(xtables_globals.orig_opts, + opts, target->x6_options, + &target->option_offset); + else + opts = xtables_merge_options(xtables_globals.orig_opts, + opts, target->extra_opts, + &target->option_offset); + + return target; +} + +static int +append_entry(struct nft_handle *h, + const char *chain, + const char *table, + struct arpt_entry *fw, + int rulenum, + unsigned int nsaddrs, + const struct in_addr saddrs[], + unsigned int ndaddrs, + const struct in_addr daddrs[], + bool verbose, bool append) +{ + unsigned int i, j; + int ret = 1; + + for (i = 0; i < nsaddrs; i++) { + fw->arp.src.s_addr = saddrs[i].s_addr; + for (j = 0; j < ndaddrs; j++) { + fw->arp.tgt.s_addr = daddrs[j].s_addr; + if (append) { + ret = nft_arp_rule_append(h, chain, table, + fw, verbose); + } else { + ret = nft_arp_rule_insert(h, chain, table, + fw, rulenum, + verbose); + } + } + } + + return ret; +} + +int do_commandarp(struct nft_handle *h, int argc, char *argv[], char **table) +{ + struct arpt_entry fw, *e = NULL; + int invert = 0; + unsigned int nsaddrs = 0, ndaddrs = 0; + struct in_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 xtables_target *target = NULL; + struct xtables_target *t; + + const char *jumpto = ""; + + memset(&fw, 0, sizeof(fw)); + opts = original_opts; + global_option_offset = 0; + + xtables_globals.orig_opts = original_opts; + + /* re-set optind to 0 in case do_command gets called + * a second time */ + optind = 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:l:i:vnt:m:c:", + 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 + xtables_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 == '-') + xtables_error(PARAMETER_PROBLEM, + "chain name not allowed to start " + "with `-'\n"); + if (xtables_find_target(optarg, XTF_TRY_LOAD)) + xtables_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 + xtables_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 + xtables_error(PARAMETER_PROBLEM, + "-%c requires a chain and a policy", + cmd2char(CMD_SET_POLICY)); + break; + + case 'h': + if (!optarg) + optarg = argv[optind]; + + exit_printhelp(); + break; + case 's': + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_S_IP, &fw.arp.invflags, + invert); + shostnetworkmask = argv[optind-1]; + break; + + case 'd': + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_D_IP, &fw.arp.invflags, + invert); + dhostnetworkmask = argv[optind-1]; + break; + + case 2:/* src-mac */ + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_S_MAC, &fw.arp.invflags, + invert); + if (getmac_and_mask(argv[optind - 1], + fw.arp.src_devaddr.addr, fw.arp.src_devaddr.mask)) + xtables_error(PARAMETER_PROBLEM, "Problem with specified " + "source mac"); + break; + + case 3:/* dst-mac */ + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_D_MAC, &fw.arp.invflags, + invert); + + if (getmac_and_mask(argv[optind - 1], + fw.arp.tgt_devaddr.addr, fw.arp.tgt_devaddr.mask)) + xtables_error(PARAMETER_PROBLEM, "Problem with specified " + "destination mac"); + break; + + case 'l':/* hardware length */ + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_H_LENGTH, &fw.arp.invflags, + invert); + getlength_and_mask(argv[optind - 1], &fw.arp.arhln, + &fw.arp.arhln_mask); + break; + + case 8:/* protocol length */ + xtables_error(PARAMETER_PROBLEM, "not supported"); +/* + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_P_LENGTH, &fw.arp.invflags, + invert); + + getlength_and_mask(argv[optind - 1], &fw.arp.arpln, + &fw.arp.arpln_mask); + break; +*/ + + case 4:/* opcode */ + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_OPCODE, &fw.arp.invflags, + invert); + if (get16_and_mask(argv[optind - 1], &fw.arp.arpop, &fw.arp.arpop_mask, 10)) { + int i; + + for (i = 0; i < NUMOPCODES; i++) + if (!strcasecmp(opcodes[i], optarg)) + break; + if (i == NUMOPCODES) + xtables_error(PARAMETER_PROBLEM, "Problem with specified opcode"); + fw.arp.arpop = htons(i+1); + } + break; + + case 5:/* h-type */ + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_H_TYPE, &fw.arp.invflags, + invert); + if (get16_and_mask(argv[optind - 1], &fw.arp.arhrd, &fw.arp.arhrd_mask, 16)) { + if (strcasecmp(argv[optind-1], "Ethernet")) + xtables_error(PARAMETER_PROBLEM, "Problem with specified hardware type"); + fw.arp.arhrd = htons(1); + } + break; + + case 6:/* proto-type */ + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_P_TYPE, &fw.arp.invflags, + invert); + if (get16_and_mask(argv[optind - 1], &fw.arp.arpro, &fw.arp.arpro_mask, 0)) { + if (strcasecmp(argv[optind-1], "ipv4")) + xtables_error(PARAMETER_PROBLEM, "Problem with specified protocol type"); + fw.arp.arpro = htons(0x800); + } + break; + + case 'j': + set_option(&options, OPT_JUMP, &fw.arp.invflags, + invert); + jumpto = parse_target(optarg); + target = command_jump(&fw, jumpto); + break; + + case 'i': + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_VIANAMEIN, &fw.arp.invflags, + invert); + parse_interface(argv[optind-1], + fw.arp.iniface, + fw.arp.iniface_mask); +/* fw.nfcache |= NFC_IP_IF_IN; */ + break; + + case 'o': + check_inverse(optarg, &invert, &optind, argc); + set_option(&options, OPT_VIANAMEOUT, &fw.arp.invflags, + invert); + parse_interface(argv[optind-1], + fw.arp.outiface, + fw.arp.outiface_mask); + /* fw.nfcache |= NFC_IP_IF_OUT; */ + break; + + case 'v': + if (!verbose) + set_option(&options, OPT_VERBOSE, + &fw.arp.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); + size = ARPT_ALIGN(sizeof(struct arpt_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.arp.invflags, + invert); + break; + + case 't': + if (invert) + xtables_error(PARAMETER_PROBLEM, + "unexpected ! flag before --table"); + *table = argv[optind-1]; + 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.arp.invflags, + invert); + break; + + case 'M': + //modprobe = optarg; + break; + + case 'c': + + set_option(&options, OPT_COUNTERS, &fw.arp.invflags, + invert); + pcnt = optarg; + if (optind < argc && argv[optind][0] != '-' + && argv[optind][0] != '!') + bcnt = argv[optind++]; + else + xtables_error(PARAMETER_PROBLEM, + "-%c requires packet and byte counter", + opt2char(OPT_COUNTERS)); + + if (sscanf(pcnt, "%llu", &fw.counters.pcnt) != 1) + xtables_error(PARAMETER_PROBLEM, + "-%c packet counter not numeric", + opt2char(OPT_COUNTERS)); + + if (sscanf(bcnt, "%llu", &fw.counters.bcnt) != 1) + xtables_error(PARAMETER_PROBLEM, + "-%c byte counter not numeric", + opt2char(OPT_COUNTERS)); + + break; + + + case 1: /* non option */ + if (optarg[0] == '!' && optarg[1] == '\0') { + if (invert) + xtables_error(PARAMETER_PROBLEM, + "multiple consecutive ! not" + " allowed"); + invert = TRUE; + optarg[0] = '\0'; + continue; + } + printf("Bad argument `%s'\n", optarg); + exit_tryhelp(2); + + default: + break; + } + invert = FALSE; + } + + if (target) + xtables_option_tfcall(target); + + /* Fix me: must put inverse options checking here --MN */ + + if (optind < argc) + xtables_error(PARAMETER_PROBLEM, + "unknown arguments found on commandline"); + if (!command) + xtables_error(PARAMETER_PROBLEM, "no command specified"); + if (invert) + xtables_error(PARAMETER_PROBLEM, + "nothing appropriate following !"); + + if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) { + if (!(options & OPT_D_IP)) + dhostnetworkmask = "0.0.0.0/0"; + if (!(options & OPT_S_IP)) + shostnetworkmask = "0.0.0.0/0"; + } + + if (shostnetworkmask) + parse_hostnetworkmask(shostnetworkmask, &saddrs, + &(fw.arp.smsk), &nsaddrs); + + if (dhostnetworkmask) + parse_hostnetworkmask(dhostnetworkmask, &daddrs, + &(fw.arp.tmsk), &ndaddrs); + + if ((nsaddrs > 1 || ndaddrs > 1) && + (fw.arp.invflags & (ARPT_INV_SRCIP | ARPT_INV_TGTIP))) + xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple" + " source or destination IP addresses"); + + if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) + xtables_error(PARAMETER_PROBLEM, "Replacement rule does not " + "specify a unique address"); + + generic_opt_check(command, options); + + if (chain && strlen(chain) > ARPT_FUNCTION_MAXNAMELEN) + xtables_error(PARAMETER_PROBLEM, + "chain name `%s' too long (must be under %i chars)", + chain, ARPT_FUNCTION_MAXNAMELEN); + + if (nft_init(h, xtables_arp) < 0) + xtables_error(OTHER_PROBLEM, + "Could not initialize nftables layer."); + + h->ops = nft_family_ops_lookup(h->family); + if (h->ops == NULL) + xtables_error(PARAMETER_PROBLEM, "Unknown family"); + + 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) + xtables_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) + xtables_error(PARAMETER_PROBLEM, + "Can't use -%c with %s\n", + opt2char(OPT_VIANAMEIN), + chain); + } + + if (!target && strlen(jumpto) != 0) { + size_t size; + + target = xtables_find_target(XT_STANDARD_TARGET, + XTF_LOAD_MUST_SUCCEED); + size = sizeof(struct arpt_entry_target) + target->size; + target->t = xtables_calloc(1, size); + target->t->u.target_size = size; + strcpy(target->t->u.user.name, jumpto); + } + + if (!target) { + xtables_error(PARAMETER_PROBLEM, + "No target provided or" + " initalization failed"); + } + + e = generate_entry(&fw, target->t); + } + + switch (command) { + case CMD_APPEND: + ret = append_entry(h, chain, *table, e, 0, + nsaddrs, saddrs, ndaddrs, daddrs, + options&OPT_VERBOSE, true); + break; + case CMD_DELETE: + /*ret = delete_entry(chain, e, + nsaddrs, saddrs, ndaddrs, daddrs, + options&OPT_VERBOSE, + handle);*/ + break; + case CMD_DELETE_NUM: + /*ret = arptc_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 = append_entry(h, chain, *table, e, rulenum, + nsaddrs, saddrs, ndaddrs, daddrs, + options&OPT_VERBOSE, false); + break; + case CMD_LIST: + ret = list_entries(h, chain, *table, + rulenum, + options&OPT_VERBOSE, + options&OPT_NUMERIC, + /*options&OPT_EXPANDED*/0, + options&OPT_LINENUMBERS); + break; + case CMD_FLUSH: + ret = nft_rule_flush(h, chain, *table); + break; + case CMD_ZERO: + ret = nft_chain_zero_counters(h, chain, *table); + break; + case CMD_LIST|CMD_ZERO: + ret = list_entries(h, chain, *table, rulenum, + options&OPT_VERBOSE, + options&OPT_NUMERIC, + /*options&OPT_EXPANDED*/0, + options&OPT_LINENUMBERS); + /*if (ret) + ret = zero_entries(chain, + options&OPT_VERBOSE, handle);*/ + break; + case CMD_NEW_CHAIN: + ret = nft_chain_user_add(h, chain, *table); + break; + case CMD_DELETE_CHAIN: + ret = nft_chain_user_del(h, chain, *table); + break; + case CMD_RENAME_CHAIN: + ret = nft_chain_user_rename(h, chain, *table, newname); + break; + case CMD_SET_POLICY: + ret = nft_chain_set(h, *table, chain, policy, NULL); + if (ret < 0) + xtables_error(PARAMETER_PROBLEM, "Wrong policy `%s'\n", + policy); + break; + default: + /* We should never reach this... */ + exit_tryhelp(2); + } + +/* if (verbose > 1) + dump_entries(*handle);*/ + + return ret; +} -- cgit v1.2.3