/* 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 #include "xshared.h" #include "nft.h" #include "nft-arp.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; #define opts xt_params->opts extern void xtables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); struct xtables_globals arptables_globals = { .option_offset = 0, .program_version = IPTABLES_VERSION, .orig_opts = original_opts, .exit_err = xtables_exit_error, .compat_rev = nft_compatible_revision, }; /* 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, }; /* 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 */ /***********************************************/ static unsigned char mac_type_unicast[ETH_ALEN] = {0,0,0,0,0,0}; static unsigned char msk_type_unicast[ETH_ALEN] = {1,0,0,0,0,0}; static unsigned char mac_type_multicast[ETH_ALEN] = {1,0,0,0,0,0}; static unsigned char msk_type_multicast[ETH_ALEN] = {1,0,0,0,0,0}; static unsigned char mac_type_broadcast[ETH_ALEN] = {255,255,255,255,255,255}; static 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", arptables_globals.program_name, arptables_globals.program_version); 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", arptables_globals.program_name, arptables_globals.program_version, arptables_globals.program_name, arptables_globals.program_name, arptables_globals.program_name, arptables_globals.program_name, arptables_globals.program_name, arptables_globals.program_name, arptables_globals.program_name, arptables_globals.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 *optidx, int argc) { if (option && strcmp(option, "!") == 0) { if (*invert) xtables_error(PARAMETER_PROBLEM, "Multiple `!' flags not allowed"); *invert = TRUE; if (optidx) { *optidx = *optidx+1; if (argc && *optidx > 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 in_addr *addr; struct addrinfo hints = { .ai_flags = AI_CANONNAME, .ai_family = AF_INET, .ai_socktype = SOCK_RAW, };; struct addrinfo *res, *p; int err; unsigned int i; *naddr = 0; err = getaddrinfo(name, NULL, &hints, &res); if (err != 0) return NULL; else { for (p = res; p != NULL; p = p->ai_next) (*naddr)++; addr = xtables_calloc(*naddr, sizeof(struct in_addr)); for (i = 0, p = res; p != NULL; p = p->ai_next) memcpy(&addr[i++], &((const struct sockaddr_in *)p->ai_addr)->sin_addr, sizeof(struct in_addr)); freeaddrinfo(res); 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: weird 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 (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX)) xtables_error(PARAMETER_PROBLEM, "Invalid rule number `%s'", rule); return rulenum; } 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 int append_entry(struct nft_handle *h, const char *chain, const char *table, struct iptables_command_state *cs, 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++) { cs->arp.arp.src.s_addr = saddrs[i].s_addr; for (j = 0; j < ndaddrs; j++) { cs->arp.arp.tgt.s_addr = daddrs[j].s_addr; if (append) { ret = nft_rule_append(h, chain, table, cs, 0, verbose); } else { ret = nft_rule_insert(h, chain, table, cs, rulenum, verbose); } } } return ret; } static int replace_entry(const char *chain, const char *table, struct iptables_command_state *cs, unsigned int rulenum, const struct in_addr *saddr, const struct in_addr *daddr, bool verbose, struct nft_handle *h) { cs->arp.arp.src.s_addr = saddr->s_addr; cs->arp.arp.tgt.s_addr = daddr->s_addr; return nft_rule_replace(h, chain, table, cs, rulenum, verbose); } static int delete_entry(const char *chain, const char *table, struct iptables_command_state *cs, unsigned int nsaddrs, const struct in_addr saddrs[], unsigned int ndaddrs, const struct in_addr daddrs[], bool verbose, struct nft_handle *h) { unsigned int i, j; int ret = 1; for (i = 0; i < nsaddrs; i++) { cs->arp.arp.src.s_addr = saddrs[i].s_addr; for (j = 0; j < ndaddrs; j++) { cs->arp.arp.tgt.s_addr = daddrs[j].s_addr; ret = nft_rule_delete(h, chain, table, cs, verbose); } } return ret; } int nft_init_arp(struct nft_handle *h, const char *pname) { arptables_globals.program_name = pname; if (xtables_init_all(&arptables_globals, NFPROTO_ARP) < 0) { fprintf(stderr, "%s/%s Failed to initialize arptables-compat\n", arptables_globals.program_name, arptables_globals.program_version); exit(1); } #if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS) init_extensionsa(); #endif memset(h, 0, sizeof(*h)); h->family = NFPROTO_ARP; 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"); return 0; } int do_commandarp(struct nft_handle *h, int argc, char *argv[], char **table, bool restore) { struct iptables_command_state cs = { .jumpto = "", .arp.arp.arhln = 6, .arp.arp.arhrd = htons(ARPHRD_ETHER), }; 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 *t; /* 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; opts = xt_params->orig_opts; 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 (xs_has_arg(argc, argv)) { rulenum = parse_rulenumber(argv[optind++]); command = CMD_DELETE_NUM; } break; case 'R': add_command(&command, CMD_REPLACE, CMD_NONE, invert); chain = optarg; if (xs_has_arg(argc, argv)) 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 (xs_has_arg(argc, argv)) 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 (xs_has_arg(argc, argv)) chain = argv[optind++]; break; case 'F': add_command(&command, CMD_FLUSH, CMD_NONE, invert); if (optarg) chain = optarg; else if (xs_has_arg(argc, argv)) chain = argv[optind++]; break; case 'Z': add_command(&command, CMD_ZERO, CMD_LIST, invert); if (optarg) chain = optarg; else if (xs_has_arg(argc, argv)) 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 (xs_has_arg(argc, argv)) chain = argv[optind++]; break; case 'E': add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, invert); chain = optarg; if (xs_has_arg(argc, argv)) 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 (xs_has_arg(argc, argv)) 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, &cs.arp.arp.invflags, invert); shostnetworkmask = argv[optind-1]; break; case 'd': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_D_IP, &cs.arp.arp.invflags, invert); dhostnetworkmask = argv[optind-1]; break; case 2:/* src-mac */ check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_S_MAC, &cs.arp.arp.invflags, invert); if (getmac_and_mask(argv[optind - 1], cs.arp.arp.src_devaddr.addr, cs.arp.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, &cs.arp.arp.invflags, invert); if (getmac_and_mask(argv[optind - 1], cs.arp.arp.tgt_devaddr.addr, cs.arp.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, &cs.arp.arp.invflags, invert); getlength_and_mask(argv[optind - 1], &cs.arp.arp.arhln, &cs.arp.arp.arhln_mask); if (cs.arp.arp.arhln != 6) { xtables_error(PARAMETER_PROBLEM, "Only harware address length of" " 6 is supported currently."); } break; case 8: /* was never supported, not even in arptables-legacy */ xtables_error(PARAMETER_PROBLEM, "not supported"); case 4:/* opcode */ check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_OPCODE, &cs.arp.arp.invflags, invert); if (get16_and_mask(argv[optind - 1], &cs.arp.arp.arpop, &cs.arp.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"); cs.arp.arp.arpop = htons(i+1); } break; case 5:/* h-type */ check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_H_TYPE, &cs.arp.arp.invflags, invert); if (get16_and_mask(argv[optind - 1], &cs.arp.arp.arhrd, &cs.arp.arp.arhrd_mask, 16)) { if (strcasecmp(argv[optind-1], "Ethernet")) xtables_error(PARAMETER_PROBLEM, "Problem with specified hardware type"); cs.arp.arp.arhrd = htons(1); } break; case 6:/* proto-type */ check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_P_TYPE, &cs.arp.arp.invflags, invert); if (get16_and_mask(argv[optind - 1], &cs.arp.arp.arpro, &cs.arp.arp.arpro_mask, 0)) { if (strcasecmp(argv[optind-1], "ipv4")) xtables_error(PARAMETER_PROBLEM, "Problem with specified protocol type"); cs.arp.arp.arpro = htons(0x800); } break; case 'j': set_option(&options, OPT_JUMP, &cs.arp.arp.invflags, invert); command_jump(&cs); break; case 'i': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_VIANAMEIN, &cs.arp.arp.invflags, invert); parse_interface(argv[optind-1], cs.arp.arp.iniface, cs.arp.arp.iniface_mask); break; case 'o': check_inverse(optarg, &invert, &optind, argc); set_option(&options, OPT_VIANAMEOUT, &cs.arp.arp.invflags, invert); parse_interface(argv[optind-1], cs.arp.arp.outiface, cs.arp.arp.outiface_mask); break; case 'v': if (!verbose) set_option(&options, OPT_VERBOSE, &cs.arp.arp.invflags, invert); verbose++; break; case 'm': /* ignored by arptables-legacy */ break; case 'n': set_option(&options, OPT_NUMERIC, &cs.arp.arp.invflags, invert); break; case 't': if (invert) xtables_error(PARAMETER_PROBLEM, "unexpected ! flag before --table"); /* ignore this option. * arptables-legacy parses it, but libarptc doesn't use it. * arptables only has a 'filter' table anyway. */ break; case 'V': if (invert) printf("Not %s ;-)\n", arptables_globals.program_version); else printf("%s v%s (nf_tables)\n", arptables_globals.program_name, arptables_globals.program_version); exit(0); case '0': set_option(&options, OPT_LINENUMBERS, &cs.arp.arp.invflags, invert); break; case 'M': //modprobe = optarg; break; case 'c': set_option(&options, OPT_COUNTERS, &cs.arp.arp.invflags, invert); pcnt = optarg; if (xs_has_arg(argc, argv)) bcnt = argv[optind++]; else xtables_error(PARAMETER_PROBLEM, "-%c requires packet and byte counter", opt2char(OPT_COUNTERS)); if (sscanf(pcnt, "%llu", &cs.arp.counters.pcnt) != 1) xtables_error(PARAMETER_PROBLEM, "-%c packet counter not numeric", opt2char(OPT_COUNTERS)); if (sscanf(bcnt, "%llu", &cs.arp.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: if (cs.target) { xtables_option_tpcall(c, argv, invert, cs.target, &cs.arp); } break; } invert = FALSE; } if (cs.target) xtables_option_tfcall(cs.target); 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, &(cs.arp.arp.smsk), &nsaddrs); if (dhostnetworkmask) parse_hostnetworkmask(dhostnetworkmask, &daddrs, &(cs.arp.arp.tmsk), &ndaddrs); if ((nsaddrs > 1 || ndaddrs > 1) && (cs.arp.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 (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); } } switch (command) { case CMD_APPEND: ret = append_entry(h, chain, *table, &cs, 0, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, true); break; case CMD_DELETE: ret = delete_entry(chain, *table, &cs, nsaddrs, saddrs, ndaddrs, daddrs, options&OPT_VERBOSE, h); break; case CMD_DELETE_NUM: ret = nft_rule_delete_num(h, chain, *table, rulenum - 1, verbose); break; case CMD_REPLACE: ret = replace_entry(chain, *table, &cs, rulenum - 1, saddrs, daddrs, options&OPT_VERBOSE, h); break; case CMD_INSERT: ret = append_entry(h, chain, *table, &cs, rulenum - 1, 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, options & OPT_VERBOSE); break; case CMD_ZERO: ret = nft_chain_zero_counters(h, chain, *table, options & OPT_VERBOSE); 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 = nft_chain_zero_counters(h, chain, *table, options & OPT_VERBOSE); 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, options & OPT_VERBOSE); 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 (nsaddrs) free(saddrs); if (ndaddrs) free(daddrs); if (cs.target) free(cs.target->t); xtables_free_opts(1); /* if (verbose > 1) dump_entries(*handle);*/ return ret; }