| /* |
| * libxt_conntrack |
| * Shared library add-on to iptables for conntrack matching support. |
| * |
| * GPL (C) 2001 Marc Boucher (marc@mbsi.ca). |
| * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
| * Jan Engelhardt <jengelh@computergmbh.de> |
| */ |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| #include <ctype.h> |
| #include <getopt.h> |
| #include <netdb.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <iptables.h> |
| #include <xtables.h> |
| #include <linux/netfilter.h> |
| #include <linux/netfilter/xt_conntrack.h> |
| #include <linux/netfilter/nf_conntrack_common.h> |
| #include <arpa/inet.h> |
| |
| /* Function which prints out usage message. */ |
| static void conntrack_mt_help(void) |
| { |
| printf( |
| "conntrack match options:\n" |
| "[!] --ctstate {INVALID|ESTABLISHED|NEW|RELATED|UNTRACKED|SNAT|DNAT}[,...]\n" |
| " State(s) to match\n" |
| "[!] --ctproto proto Protocol to match; by number or name, e.g. \"tcp\"\n" |
| "[!] --ctorigsrc address[/mask]\n" |
| "[!] --ctorigdst address[/mask]\n" |
| "[!] --ctreplsrc address[/mask]\n" |
| "[!] --ctrepldst address[/mask]\n" |
| " Original/Reply source/destination address\n" |
| "[!] --ctorigsrcport port\n" |
| "[!] --ctorigdstport port\n" |
| "[!] --ctreplsrcport port\n" |
| "[!] --ctrepldstport port\n" |
| " TCP/UDP/SCTP orig./reply source/destination port\n" |
| "[!] --ctstatus {NONE|EXPECTED|SEEN_REPLY|ASSURED|CONFIRMED}[,...]\n" |
| " Status(es) to match\n" |
| "[!] --ctexpire time[:time] Match remaining lifetime in seconds against\n" |
| " value or range of values (inclusive)\n" |
| " --ctdir {ORIGINAL|REPLY} Flow direction of packet\n"); |
| } |
| |
| static const struct option conntrack_mt_opts_v0[] = { |
| {.name = "ctstate", .has_arg = true, .val = '1'}, |
| {.name = "ctproto", .has_arg = true, .val = '2'}, |
| {.name = "ctorigsrc", .has_arg = true, .val = '3'}, |
| {.name = "ctorigdst", .has_arg = true, .val = '4'}, |
| {.name = "ctreplsrc", .has_arg = true, .val = '5'}, |
| {.name = "ctrepldst", .has_arg = true, .val = '6'}, |
| {.name = "ctstatus", .has_arg = true, .val = '7'}, |
| {.name = "ctexpire", .has_arg = true, .val = '8'}, |
| { .name = NULL } |
| }; |
| |
| static const struct option conntrack_mt_opts[] = { |
| {.name = "ctstate", .has_arg = true, .val = '1'}, |
| {.name = "ctproto", .has_arg = true, .val = '2'}, |
| {.name = "ctorigsrc", .has_arg = true, .val = '3'}, |
| {.name = "ctorigdst", .has_arg = true, .val = '4'}, |
| {.name = "ctreplsrc", .has_arg = true, .val = '5'}, |
| {.name = "ctrepldst", .has_arg = true, .val = '6'}, |
| {.name = "ctstatus", .has_arg = true, .val = '7'}, |
| {.name = "ctexpire", .has_arg = true, .val = '8'}, |
| {.name = "ctorigsrcport", .has_arg = true, .val = 'a'}, |
| {.name = "ctorigdstport", .has_arg = true, .val = 'b'}, |
| {.name = "ctreplsrcport", .has_arg = true, .val = 'c'}, |
| {.name = "ctrepldstport", .has_arg = true, .val = 'd'}, |
| {.name = "ctdir", .has_arg = true, .val = 'e'}, |
| {.name = NULL}, |
| }; |
| |
| static int |
| parse_state(const char *state, size_t len, struct xt_conntrack_info *sinfo) |
| { |
| if (strncasecmp(state, "INVALID", len) == 0) |
| sinfo->statemask |= XT_CONNTRACK_STATE_INVALID; |
| else if (strncasecmp(state, "NEW", len) == 0) |
| sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_NEW); |
| else if (strncasecmp(state, "ESTABLISHED", len) == 0) |
| sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED); |
| else if (strncasecmp(state, "RELATED", len) == 0) |
| sinfo->statemask |= XT_CONNTRACK_STATE_BIT(IP_CT_RELATED); |
| else if (strncasecmp(state, "UNTRACKED", len) == 0) |
| sinfo->statemask |= XT_CONNTRACK_STATE_UNTRACKED; |
| else if (strncasecmp(state, "SNAT", len) == 0) |
| sinfo->statemask |= XT_CONNTRACK_STATE_SNAT; |
| else if (strncasecmp(state, "DNAT", len) == 0) |
| sinfo->statemask |= XT_CONNTRACK_STATE_DNAT; |
| else |
| return 0; |
| return 1; |
| } |
| |
| static void |
| parse_states(const char *arg, struct xt_conntrack_info *sinfo) |
| { |
| const char *comma; |
| |
| while ((comma = strchr(arg, ',')) != NULL) { |
| if (comma == arg || !parse_state(arg, comma-arg, sinfo)) |
| exit_error(PARAMETER_PROBLEM, "Bad ctstate `%s'", arg); |
| arg = comma+1; |
| } |
| |
| if (strlen(arg) == 0 || !parse_state(arg, strlen(arg), sinfo)) |
| exit_error(PARAMETER_PROBLEM, "Bad ctstate `%s'", arg); |
| } |
| |
| static bool |
| conntrack_ps_state(struct xt_conntrack_mtinfo1 *info, const char *state, |
| size_t z) |
| { |
| if (strncasecmp(state, "INVALID", z) == 0) |
| info->state_mask |= XT_CONNTRACK_STATE_INVALID; |
| else if (strncasecmp(state, "NEW", z) == 0) |
| info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_NEW); |
| else if (strncasecmp(state, "ESTABLISHED", z) == 0) |
| info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED); |
| else if (strncasecmp(state, "RELATED", z) == 0) |
| info->state_mask |= XT_CONNTRACK_STATE_BIT(IP_CT_RELATED); |
| else if (strncasecmp(state, "UNTRACKED", z) == 0) |
| info->state_mask |= XT_CONNTRACK_STATE_UNTRACKED; |
| else if (strncasecmp(state, "SNAT", z) == 0) |
| info->state_mask |= XT_CONNTRACK_STATE_SNAT; |
| else if (strncasecmp(state, "DNAT", z) == 0) |
| info->state_mask |= XT_CONNTRACK_STATE_DNAT; |
| else |
| return false; |
| return true; |
| } |
| |
| static void |
| conntrack_ps_states(struct xt_conntrack_mtinfo1 *info, const char *arg) |
| { |
| const char *comma; |
| |
| while ((comma = strchr(arg, ',')) != NULL) { |
| if (comma == arg || !conntrack_ps_state(info, arg, comma - arg)) |
| exit_error(PARAMETER_PROBLEM, |
| "Bad ctstate \"%s\"", arg); |
| arg = comma + 1; |
| } |
| |
| if (strlen(arg) == 0 || !conntrack_ps_state(info, arg, strlen(arg))) |
| exit_error(PARAMETER_PROBLEM, "Bad ctstate \"%s\"", arg); |
| } |
| |
| static int |
| parse_status(const char *status, size_t len, struct xt_conntrack_info *sinfo) |
| { |
| if (strncasecmp(status, "NONE", len) == 0) |
| sinfo->statusmask |= 0; |
| else if (strncasecmp(status, "EXPECTED", len) == 0) |
| sinfo->statusmask |= IPS_EXPECTED; |
| else if (strncasecmp(status, "SEEN_REPLY", len) == 0) |
| sinfo->statusmask |= IPS_SEEN_REPLY; |
| else if (strncasecmp(status, "ASSURED", len) == 0) |
| sinfo->statusmask |= IPS_ASSURED; |
| #ifdef IPS_CONFIRMED |
| else if (strncasecmp(status, "CONFIRMED", len) == 0) |
| sinfo->statusmask |= IPS_CONFIRMED; |
| #endif |
| else |
| return 0; |
| return 1; |
| } |
| |
| static void |
| parse_statuses(const char *arg, struct xt_conntrack_info *sinfo) |
| { |
| const char *comma; |
| |
| while ((comma = strchr(arg, ',')) != NULL) { |
| if (comma == arg || !parse_status(arg, comma-arg, sinfo)) |
| exit_error(PARAMETER_PROBLEM, "Bad ctstatus `%s'", arg); |
| arg = comma+1; |
| } |
| |
| if (strlen(arg) == 0 || !parse_status(arg, strlen(arg), sinfo)) |
| exit_error(PARAMETER_PROBLEM, "Bad ctstatus `%s'", arg); |
| } |
| |
| static bool |
| conntrack_ps_status(struct xt_conntrack_mtinfo1 *info, const char *status, |
| size_t z) |
| { |
| if (strncasecmp(status, "NONE", z) == 0) |
| info->status_mask |= 0; |
| else if (strncasecmp(status, "EXPECTED", z) == 0) |
| info->status_mask |= IPS_EXPECTED; |
| else if (strncasecmp(status, "SEEN_REPLY", z) == 0) |
| info->status_mask |= IPS_SEEN_REPLY; |
| else if (strncasecmp(status, "ASSURED", z) == 0) |
| info->status_mask |= IPS_ASSURED; |
| else if (strncasecmp(status, "CONFIRMED", z) == 0) |
| info->status_mask |= IPS_CONFIRMED; |
| else |
| return false; |
| return true; |
| } |
| |
| static void |
| conntrack_ps_statuses(struct xt_conntrack_mtinfo1 *info, const char *arg) |
| { |
| const char *comma; |
| |
| while ((comma = strchr(arg, ',')) != NULL) { |
| if (comma == arg || !conntrack_ps_status(info, arg, comma - arg)) |
| exit_error(PARAMETER_PROBLEM, |
| "Bad ctstatus \"%s\"", arg); |
| arg = comma + 1; |
| } |
| |
| if (strlen(arg) == 0 || !conntrack_ps_status(info, arg, strlen(arg))) |
| exit_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg); |
| } |
| |
| static unsigned long |
| parse_expire(const char *s) |
| { |
| unsigned int len; |
| |
| if (string_to_number(s, 0, 0, &len) == -1) |
| exit_error(PARAMETER_PROBLEM, "expire value invalid: `%s'\n", s); |
| else |
| return len; |
| } |
| |
| /* If a single value is provided, min and max are both set to the value */ |
| static void |
| parse_expires(const char *s, struct xt_conntrack_info *sinfo) |
| { |
| char *buffer; |
| char *cp; |
| |
| buffer = strdup(s); |
| if ((cp = strchr(buffer, ':')) == NULL) |
| sinfo->expires_min = sinfo->expires_max = |
| parse_expire(buffer); |
| else { |
| *cp = '\0'; |
| cp++; |
| |
| sinfo->expires_min = buffer[0] ? parse_expire(buffer) : 0; |
| sinfo->expires_max = cp[0] |
| ? parse_expire(cp) |
| : (unsigned long)-1; |
| } |
| free(buffer); |
| |
| if (sinfo->expires_min > sinfo->expires_max) |
| exit_error(PARAMETER_PROBLEM, |
| "expire min. range value `%lu' greater than max. " |
| "range value `%lu'", sinfo->expires_min, sinfo->expires_max); |
| } |
| |
| static void |
| conntrack_ps_expires(struct xt_conntrack_mtinfo1 *info, const char *s) |
| { |
| unsigned int min, max; |
| char *end; |
| |
| if (!strtonum(s, &end, &min, 0, ~0)) |
| param_act(P_BAD_VALUE, "conntrack", "--expires", s); |
| max = min; |
| if (*end == ':') |
| if (!strtonum(s, &end, &max, 0, ~0U)) |
| param_act(P_BAD_VALUE, "conntrack", "--expires", s); |
| if (*end != '\0') |
| param_act(P_BAD_VALUE, "conntrack", "--expires", s); |
| |
| if (min > max) |
| exit_error(PARAMETER_PROBLEM, |
| "expire min. range value \"%u\" greater than max. " |
| "range value \"%u\"", min, max); |
| |
| info->expires_min = min; |
| info->expires_max = max; |
| } |
| |
| /* Function which parses command options; returns true if it |
| ate an option */ |
| static int conntrack_parse(int c, char **argv, int invert, unsigned int *flags, |
| const void *entry, struct xt_entry_match **match) |
| { |
| struct xt_conntrack_info *sinfo = (void *)(*match)->data; |
| char *protocol = NULL; |
| unsigned int naddrs = 0; |
| struct in_addr *addrs = NULL; |
| |
| |
| switch (c) { |
| case '1': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| parse_states(argv[optind-1], sinfo); |
| if (invert) { |
| sinfo->invflags |= XT_CONNTRACK_STATE; |
| } |
| sinfo->flags |= XT_CONNTRACK_STATE; |
| break; |
| |
| case '2': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| if(invert) |
| sinfo->invflags |= XT_CONNTRACK_PROTO; |
| |
| /* Canonicalize into lower case */ |
| for (protocol = argv[optind-1]; *protocol; protocol++) |
| *protocol = tolower(*protocol); |
| |
| protocol = argv[optind-1]; |
| sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum = parse_protocol(protocol); |
| |
| if (sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum == 0 |
| && (sinfo->invflags & XT_INV_PROTO)) |
| exit_error(PARAMETER_PROBLEM, |
| "rule would never match protocol"); |
| |
| sinfo->flags |= XT_CONNTRACK_PROTO; |
| break; |
| |
| case '3': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| if (invert) |
| sinfo->invflags |= XT_CONNTRACK_ORIGSRC; |
| |
| ipparse_hostnetworkmask(argv[optind-1], &addrs, |
| &sinfo->sipmsk[IP_CT_DIR_ORIGINAL], |
| &naddrs); |
| if(naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| |
| if(naddrs == 1) { |
| sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip = addrs[0].s_addr; |
| } |
| |
| sinfo->flags |= XT_CONNTRACK_ORIGSRC; |
| break; |
| |
| case '4': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| if (invert) |
| sinfo->invflags |= XT_CONNTRACK_ORIGDST; |
| |
| ipparse_hostnetworkmask(argv[optind-1], &addrs, |
| &sinfo->dipmsk[IP_CT_DIR_ORIGINAL], |
| &naddrs); |
| if(naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| |
| if(naddrs == 1) { |
| sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip = addrs[0].s_addr; |
| } |
| |
| sinfo->flags |= XT_CONNTRACK_ORIGDST; |
| break; |
| |
| case '5': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| if (invert) |
| sinfo->invflags |= XT_CONNTRACK_REPLSRC; |
| |
| ipparse_hostnetworkmask(argv[optind-1], &addrs, |
| &sinfo->sipmsk[IP_CT_DIR_REPLY], |
| &naddrs); |
| if(naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| |
| if(naddrs == 1) { |
| sinfo->tuple[IP_CT_DIR_REPLY].src.ip = addrs[0].s_addr; |
| } |
| |
| sinfo->flags |= XT_CONNTRACK_REPLSRC; |
| break; |
| |
| case '6': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| if (invert) |
| sinfo->invflags |= XT_CONNTRACK_REPLDST; |
| |
| ipparse_hostnetworkmask(argv[optind-1], &addrs, |
| &sinfo->dipmsk[IP_CT_DIR_REPLY], |
| &naddrs); |
| if(naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| |
| if(naddrs == 1) { |
| sinfo->tuple[IP_CT_DIR_REPLY].dst.ip = addrs[0].s_addr; |
| } |
| |
| sinfo->flags |= XT_CONNTRACK_REPLDST; |
| break; |
| |
| case '7': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| parse_statuses(argv[optind-1], sinfo); |
| if (invert) { |
| sinfo->invflags |= XT_CONNTRACK_STATUS; |
| } |
| sinfo->flags |= XT_CONNTRACK_STATUS; |
| break; |
| |
| case '8': |
| check_inverse(optarg, &invert, &optind, 0); |
| |
| parse_expires(argv[optind-1], sinfo); |
| if (invert) { |
| sinfo->invflags |= XT_CONNTRACK_EXPIRES; |
| } |
| sinfo->flags |= XT_CONNTRACK_EXPIRES; |
| break; |
| |
| default: |
| return 0; |
| } |
| |
| *flags = sinfo->flags; |
| return 1; |
| } |
| |
| static int |
| conntrack_mt_parse(int c, char **argv, int invert, unsigned int *flags, |
| struct xt_entry_match **match) |
| { |
| struct xt_conntrack_mtinfo1 *info = (void *)(*match)->data; |
| unsigned int port; |
| char *p; |
| |
| switch (c) { |
| case '1': /* --ctstate */ |
| conntrack_ps_states(info, optarg); |
| info->match_flags |= XT_CONNTRACK_STATE; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_STATE; |
| break; |
| |
| case '2': /* --ctproto */ |
| /* Canonicalize into lower case */ |
| for (p = optarg; *p != '\0'; ++p) |
| *p = tolower(*p); |
| info->l4proto = parse_protocol(optarg); |
| |
| if (info->l4proto == 0 && (info->invert_flags & XT_INV_PROTO)) |
| exit_error(PARAMETER_PROBLEM, "conntrack: rule would " |
| "never match protocol"); |
| |
| info->match_flags |= XT_CONNTRACK_PROTO; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_PROTO; |
| break; |
| |
| case '7': /* --ctstatus */ |
| conntrack_ps_statuses(info, optarg); |
| info->match_flags |= XT_CONNTRACK_STATUS; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_STATUS; |
| break; |
| |
| case '8': /* --ctexpire */ |
| conntrack_ps_expires(info, optarg); |
| info->match_flags |= XT_CONNTRACK_EXPIRES; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_EXPIRES; |
| break; |
| |
| case 'a': /* --ctorigsrcport */ |
| if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0)) |
| param_act(P_BAD_VALUE, "conntrack", |
| "--ctorigsrcport", optarg); |
| info->match_flags |= XT_CONNTRACK_ORIGSRC_PORT; |
| info->origsrc_port = htons(port); |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_ORIGSRC_PORT; |
| break; |
| |
| case 'b': /* --ctorigdstport */ |
| if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0)) |
| param_act(P_BAD_VALUE, "conntrack", |
| "--ctorigdstport", optarg); |
| info->match_flags |= XT_CONNTRACK_ORIGDST_PORT; |
| info->origdst_port = htons(port); |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_ORIGDST_PORT; |
| break; |
| |
| case 'c': /* --ctreplsrcport */ |
| if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0)) |
| param_act(P_BAD_VALUE, "conntrack", |
| "--ctreplsrcport", optarg); |
| info->match_flags |= XT_CONNTRACK_REPLSRC_PORT; |
| info->replsrc_port = htons(port); |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_REPLSRC_PORT; |
| break; |
| |
| case 'd': /* --ctrepldstport */ |
| if (!strtonum(optarg, NULL, &port, 0, ~(u_int16_t)0)) |
| param_act(P_BAD_VALUE, "conntrack", |
| "--ctrepldstport", optarg); |
| info->match_flags |= XT_CONNTRACK_REPLDST_PORT; |
| info->repldst_port = htons(port); |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_REPLDST_PORT; |
| break; |
| |
| case 'e': /* --ctdir */ |
| param_act(P_NO_INVERT, "conntrack", "--ctdir", invert); |
| if (strcasecmp(optarg, "ORIGINAL") == 0) { |
| info->match_flags |= XT_CONNTRACK_DIRECTION; |
| info->invert_flags &= ~XT_CONNTRACK_DIRECTION; |
| } else if (strcasecmp(optarg, "REPLY") == 0) { |
| info->match_flags |= XT_CONNTRACK_DIRECTION; |
| info->invert_flags |= XT_CONNTRACK_DIRECTION; |
| } else { |
| param_act(P_BAD_VALUE, "conntrack", "--ctdir", optarg); |
| } |
| break; |
| |
| default: |
| return false; |
| } |
| |
| *flags = info->match_flags; |
| return true; |
| } |
| |
| static int |
| conntrack_mt4_parse(int c, char **argv, int invert, unsigned int *flags, |
| const void *entry, struct xt_entry_match **match) |
| { |
| struct xt_conntrack_mtinfo1 *info = (void *)(*match)->data; |
| struct in_addr *addr = NULL; |
| unsigned int naddrs = 0; |
| |
| switch (c) { |
| case '3': /* --ctorigsrc */ |
| ipparse_hostnetworkmask(optarg, &addr, &info->origsrc_mask.in, |
| &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->origsrc_addr.in, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_ORIGSRC; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_ORIGSRC; |
| break; |
| |
| case '4': /* --ctorigdst */ |
| ipparse_hostnetworkmask(optarg, &addr, &info->origdst_mask.in, |
| &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->origdst_addr.in, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_ORIGDST; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_ORIGDST; |
| break; |
| |
| case '5': /* --ctreplsrc */ |
| ipparse_hostnetworkmask(optarg, &addr, &info->replsrc_mask.in, |
| &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->replsrc_addr.in, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_REPLSRC; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_REPLSRC; |
| break; |
| |
| case '6': /* --ctrepldst */ |
| ipparse_hostnetworkmask(optarg, &addr, &info->repldst_mask.in, |
| &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->repldst_addr.in, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_REPLDST; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_REPLDST; |
| break; |
| |
| |
| default: |
| return conntrack_mt_parse(c, argv, invert, flags, match); |
| } |
| |
| *flags = info->match_flags; |
| return true; |
| } |
| |
| static int |
| conntrack_mt6_parse(int c, char **argv, int invert, unsigned int *flags, |
| const void *entry, struct xt_entry_match **match) |
| { |
| struct xt_conntrack_mtinfo1 *info = (void *)(*match)->data; |
| struct in6_addr *addr = NULL; |
| unsigned int naddrs = 0; |
| |
| switch (c) { |
| case '3': /* --ctorigsrc */ |
| ip6parse_hostnetworkmask(optarg, &addr, |
| &info->origsrc_mask.in6, &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->origsrc_addr.in6, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_ORIGSRC; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_ORIGSRC; |
| break; |
| |
| case '4': /* --ctorigdst */ |
| ip6parse_hostnetworkmask(optarg, &addr, |
| &info->origdst_mask.in6, &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->origdst_addr.in, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_ORIGDST; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_ORIGDST; |
| break; |
| |
| case '5': /* --ctreplsrc */ |
| ip6parse_hostnetworkmask(optarg, &addr, |
| &info->replsrc_mask.in6, &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->replsrc_addr.in, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_REPLSRC; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_REPLSRC; |
| break; |
| |
| case '6': /* --ctrepldst */ |
| ip6parse_hostnetworkmask(optarg, &addr, |
| &info->repldst_mask.in6, &naddrs); |
| if (naddrs > 1) |
| exit_error(PARAMETER_PROBLEM, |
| "multiple IP addresses not allowed"); |
| if (naddrs == 1) |
| memcpy(&info->repldst_addr.in, addr, sizeof(*addr)); |
| info->match_flags |= XT_CONNTRACK_REPLDST; |
| if (invert) |
| info->invert_flags |= XT_CONNTRACK_REPLDST; |
| break; |
| |
| |
| default: |
| return conntrack_mt_parse(c, argv, invert, flags, match); |
| } |
| |
| *flags = info->match_flags; |
| return true; |
| } |
| |
| static void conntrack_mt_check(unsigned int flags) |
| { |
| if (flags == 0) |
| exit_error(PARAMETER_PROBLEM, "conntrack: At least one option " |
| "is required"); |
| } |
| |
| static void |
| print_state(unsigned int statemask) |
| { |
| const char *sep = ""; |
| |
| if (statemask & XT_CONNTRACK_STATE_INVALID) { |
| printf("%sINVALID", sep); |
| sep = ","; |
| } |
| if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_NEW)) { |
| printf("%sNEW", sep); |
| sep = ","; |
| } |
| if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_RELATED)) { |
| printf("%sRELATED", sep); |
| sep = ","; |
| } |
| if (statemask & XT_CONNTRACK_STATE_BIT(IP_CT_ESTABLISHED)) { |
| printf("%sESTABLISHED", sep); |
| sep = ","; |
| } |
| if (statemask & XT_CONNTRACK_STATE_UNTRACKED) { |
| printf("%sUNTRACKED", sep); |
| sep = ","; |
| } |
| if (statemask & XT_CONNTRACK_STATE_SNAT) { |
| printf("%sSNAT", sep); |
| sep = ","; |
| } |
| if (statemask & XT_CONNTRACK_STATE_DNAT) { |
| printf("%sDNAT", sep); |
| sep = ","; |
| } |
| printf(" "); |
| } |
| |
| static void |
| print_status(unsigned int statusmask) |
| { |
| const char *sep = ""; |
| |
| if (statusmask & IPS_EXPECTED) { |
| printf("%sEXPECTED", sep); |
| sep = ","; |
| } |
| if (statusmask & IPS_SEEN_REPLY) { |
| printf("%sSEEN_REPLY", sep); |
| sep = ","; |
| } |
| if (statusmask & IPS_ASSURED) { |
| printf("%sASSURED", sep); |
| sep = ","; |
| } |
| if (statusmask & IPS_CONFIRMED) { |
| printf("%sCONFIRMED", sep); |
| sep = ","; |
| } |
| if (statusmask == 0) |
| printf("%sNONE", sep); |
| printf(" "); |
| } |
| |
| static void |
| conntrack_dump_addr(const union nf_inet_addr *addr, |
| const union nf_inet_addr *mask, |
| unsigned int family, bool numeric) |
| { |
| if (family == AF_INET) { |
| if (!numeric && addr->ip == 0) { |
| printf("anywhere "); |
| return; |
| } |
| printf("%s ", ipaddr_to_anyname(&addr->in)); |
| } else if (family == AF_INET6) { |
| if (!numeric && addr->ip6[0] == 0 && addr->ip6[1] == 0 && |
| addr->ip6[2] == 0 && addr->ip6[3] == 0) { |
| printf("anywhere "); |
| return; |
| } |
| printf("%s ", ip6addr_to_anyname(&addr->in6)); |
| } |
| } |
| |
| static void |
| print_addr(struct in_addr *addr, struct in_addr *mask, int inv, int numeric) |
| { |
| char buf[BUFSIZ]; |
| |
| if (inv) |
| printf("! "); |
| |
| if (mask->s_addr == 0L && !numeric) |
| printf("%s ", "anywhere"); |
| else { |
| if (numeric) |
| sprintf(buf, "%s", ipaddr_to_numeric(addr)); |
| else |
| sprintf(buf, "%s", ipaddr_to_anyname(addr)); |
| strcat(buf, ipmask_to_numeric(mask)); |
| printf("%s ", buf); |
| } |
| } |
| |
| /* Saves the matchinfo in parsable form to stdout. */ |
| static void |
| matchinfo_print(const void *ip, const struct xt_entry_match *match, int numeric, const char *optpfx) |
| { |
| struct xt_conntrack_info *sinfo = (void *)match->data; |
| |
| if(sinfo->flags & XT_CONNTRACK_STATE) { |
| if (sinfo->invflags & XT_CONNTRACK_STATE) |
| printf("! "); |
| printf("%sctstate ", optpfx); |
| print_state(sinfo->statemask); |
| } |
| |
| if(sinfo->flags & XT_CONNTRACK_PROTO) { |
| if (sinfo->invflags & XT_CONNTRACK_PROTO) |
| printf("! "); |
| printf("%sctproto ", optpfx); |
| printf("%u ", sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum); |
| } |
| |
| if(sinfo->flags & XT_CONNTRACK_ORIGSRC) { |
| if (sinfo->invflags & XT_CONNTRACK_ORIGSRC) |
| printf("! "); |
| printf("%sctorigsrc ", optpfx); |
| |
| print_addr( |
| (struct in_addr *)&sinfo->tuple[IP_CT_DIR_ORIGINAL].src.ip, |
| &sinfo->sipmsk[IP_CT_DIR_ORIGINAL], |
| false, |
| numeric); |
| } |
| |
| if(sinfo->flags & XT_CONNTRACK_ORIGDST) { |
| if (sinfo->invflags & XT_CONNTRACK_ORIGDST) |
| printf("! "); |
| printf("%sctorigdst ", optpfx); |
| |
| print_addr( |
| (struct in_addr *)&sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.ip, |
| &sinfo->dipmsk[IP_CT_DIR_ORIGINAL], |
| false, |
| numeric); |
| } |
| |
| if(sinfo->flags & XT_CONNTRACK_REPLSRC) { |
| if (sinfo->invflags & XT_CONNTRACK_REPLSRC) |
| printf("! "); |
| printf("%sctreplsrc ", optpfx); |
| |
| print_addr( |
| (struct in_addr *)&sinfo->tuple[IP_CT_DIR_REPLY].src.ip, |
| &sinfo->sipmsk[IP_CT_DIR_REPLY], |
| false, |
| numeric); |
| } |
| |
| if(sinfo->flags & XT_CONNTRACK_REPLDST) { |
| if (sinfo->invflags & XT_CONNTRACK_REPLDST) |
| printf("! "); |
| printf("%sctrepldst ", optpfx); |
| |
| print_addr( |
| (struct in_addr *)&sinfo->tuple[IP_CT_DIR_REPLY].dst.ip, |
| &sinfo->dipmsk[IP_CT_DIR_REPLY], |
| false, |
| numeric); |
| } |
| |
| if(sinfo->flags & XT_CONNTRACK_STATUS) { |
| if (sinfo->invflags & XT_CONNTRACK_STATUS) |
| printf("! "); |
| printf("%sctstatus ", optpfx); |
| print_status(sinfo->statusmask); |
| } |
| |
| if(sinfo->flags & XT_CONNTRACK_EXPIRES) { |
| if (sinfo->invflags & XT_CONNTRACK_EXPIRES) |
| printf("! "); |
| printf("%sctexpire ", optpfx); |
| |
| if (sinfo->expires_max == sinfo->expires_min) |
| printf("%lu ", sinfo->expires_min); |
| else |
| printf("%lu:%lu ", sinfo->expires_min, sinfo->expires_max); |
| } |
| } |
| |
| static void |
| conntrack_dump(const struct xt_conntrack_mtinfo1 *info, const char *prefix, |
| unsigned int family, bool numeric) |
| { |
| if (info->match_flags & XT_CONNTRACK_STATE) { |
| if (info->invert_flags & XT_CONNTRACK_STATE) |
| printf("! "); |
| printf("%sctstate ", prefix); |
| print_state(info->state_mask); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_PROTO) { |
| if (info->invert_flags & XT_CONNTRACK_PROTO) |
| printf("! "); |
| printf("%sctproto %u ", prefix, info->l4proto); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_ORIGSRC) { |
| if (info->invert_flags & XT_CONNTRACK_PROTO) |
| printf("! "); |
| printf("%sctorigsrc ", prefix); |
| conntrack_dump_addr(&info->origsrc_addr, &info->origsrc_mask, |
| family, numeric); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_ORIGDST) { |
| if (info->invert_flags & XT_CONNTRACK_PROTO) |
| printf("! "); |
| printf("%sctorigdst ", prefix); |
| conntrack_dump_addr(&info->origdst_addr, &info->origdst_mask, |
| family, numeric); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_REPLSRC) { |
| if (info->invert_flags & XT_CONNTRACK_PROTO) |
| printf("! "); |
| printf("%sctreplsrc ", prefix); |
| conntrack_dump_addr(&info->replsrc_addr, &info->replsrc_mask, |
| family, numeric); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_REPLDST) { |
| if (info->invert_flags & XT_CONNTRACK_PROTO) |
| printf("! "); |
| printf("%sctrepldst ", prefix); |
| conntrack_dump_addr(&info->repldst_addr, &info->repldst_mask, |
| family, numeric); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_ORIGSRC_PORT) { |
| if (info->invert_flags & XT_CONNTRACK_ORIGSRC_PORT) |
| printf("! "); |
| printf("%sctorigsrcport %u ", prefix, |
| ntohs(info->origsrc_port)); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_ORIGDST_PORT) { |
| if (info->invert_flags & XT_CONNTRACK_ORIGDST_PORT) |
| printf("! "); |
| printf("%sctorigdstport %u ", prefix, |
| ntohs(info->origdst_port)); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_REPLSRC_PORT) { |
| if (info->invert_flags & XT_CONNTRACK_REPLSRC_PORT) |
| printf("! "); |
| printf("%sctreplsrcport %u ", prefix, |
| ntohs(info->replsrc_port)); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_REPLDST_PORT) { |
| if (info->invert_flags & XT_CONNTRACK_REPLDST_PORT) |
| printf("! "); |
| printf("%sctrepldstport %u ", prefix, |
| ntohs(info->repldst_port)); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_STATUS) { |
| if (info->invert_flags & XT_CONNTRACK_STATUS) |
| printf("! "); |
| printf("%sctstatus ", prefix); |
| print_status(info->status_mask); |
| } |
| |
| if (info->match_flags & XT_CONNTRACK_EXPIRES) { |
| if (info->invert_flags & XT_CONNTRACK_EXPIRES) |
| printf("! "); |
| printf("%sctexpire ", prefix); |
| |
| if (info->expires_max == info->expires_min) |
| printf("%u ", (unsigned int)info->expires_min); |
| else |
| printf("%u:%u ", (unsigned int)info->expires_min, |
| (unsigned int)info->expires_max); |
| } |
| } |
| |
| /* Prints out the matchinfo. */ |
| static void conntrack_print(const void *ip, const struct xt_entry_match *match, |
| int numeric) |
| { |
| matchinfo_print(ip, match, numeric, ""); |
| } |
| |
| static void |
| conntrack_mt_print(const void *ip, const struct xt_entry_match *match, |
| int numeric) |
| { |
| conntrack_dump((const void *)match->data, "", AF_INET, numeric); |
| } |
| |
| static void |
| conntrack_mt6_print(const void *ip, const struct xt_entry_match *match, |
| int numeric) |
| { |
| conntrack_dump((const void *)match->data, "", AF_INET6, numeric); |
| } |
| |
| /* Saves the matchinfo in parsable form to stdout. */ |
| static void conntrack_save(const void *ip, const struct xt_entry_match *match) |
| { |
| matchinfo_print(ip, match, 1, "--"); |
| } |
| |
| static void conntrack_mt_save(const void *ip, |
| const struct xt_entry_match *match) |
| { |
| conntrack_dump((const void *)match->data, "--", AF_INET, true); |
| } |
| |
| static void conntrack_mt6_save(const void *ip, |
| const struct xt_entry_match *match) |
| { |
| conntrack_dump((const void *)match->data, "--", AF_INET6, true); |
| } |
| |
| static struct xtables_match conntrack_match = { |
| .version = XTABLES_VERSION, |
| .name = "conntrack", |
| .revision = 0, |
| .family = AF_INET, |
| .size = XT_ALIGN(sizeof(struct xt_conntrack_info)), |
| .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_info)), |
| .help = conntrack_mt_help, |
| .parse = conntrack_parse, |
| .final_check = conntrack_mt_check, |
| .print = conntrack_print, |
| .save = conntrack_save, |
| .extra_opts = conntrack_mt_opts_v0, |
| }; |
| |
| static struct xtables_match conntrack_mt_reg = { |
| .version = XTABLES_VERSION, |
| .name = "conntrack", |
| .revision = 1, |
| .family = AF_INET, |
| .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), |
| .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), |
| .help = conntrack_mt_help, |
| .parse = conntrack_mt4_parse, |
| .final_check = conntrack_mt_check, |
| .print = conntrack_mt_print, |
| .save = conntrack_mt_save, |
| .extra_opts = conntrack_mt_opts, |
| }; |
| |
| static struct xtables_match conntrack_mt6_reg = { |
| .version = XTABLES_VERSION, |
| .name = "conntrack", |
| .revision = 1, |
| .family = AF_INET6, |
| .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), |
| .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), |
| .help = conntrack_mt_help, |
| .parse = conntrack_mt6_parse, |
| .final_check = conntrack_mt_check, |
| .print = conntrack_mt6_print, |
| .save = conntrack_mt6_save, |
| .extra_opts = conntrack_mt_opts, |
| }; |
| |
| void _init(void) |
| { |
| xtables_register_match(&conntrack_match); |
| xtables_register_match(&conntrack_mt_reg); |
| xtables_register_match(&conntrack_mt6_reg); |
| } |