diff options
Diffstat (limited to 'extensions/libxt_conntrack.c')
| -rw-r--r-- | extensions/libxt_conntrack.c | 1243 |
1 files changed, 1243 insertions, 0 deletions
diff --git a/extensions/libxt_conntrack.c b/extensions/libxt_conntrack.c new file mode 100644 index 0000000..5557d3e --- /dev/null +++ b/extensions/libxt_conntrack.c @@ -0,0 +1,1243 @@ +/* + * 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 <stddef.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.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> + +struct ip_conntrack_old_tuple { + struct { + __be32 ip; + union { + __u16 all; + } u; + } src; + + struct { + __be32 ip; + union { + __u16 all; + } u; + + /* The protocol. */ + __u16 protonum; + } dst; +}; + +struct xt_conntrack_info { + unsigned int statemask, statusmask; + + struct ip_conntrack_old_tuple tuple[IP_CT_DIR_MAX]; + struct in_addr sipmsk[IP_CT_DIR_MAX], dipmsk[IP_CT_DIR_MAX]; + + unsigned long expires_min, expires_max; + + /* Flags word */ + u_int8_t flags; + /* Inverse flags */ + u_int8_t invflags; +}; + +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)) + xtables_error(PARAMETER_PROBLEM, "Bad ctstate \"%s\"", arg); + arg = comma+1; + } + if (!*arg) + xtables_error(PARAMETER_PROBLEM, "\"--ctstate\" requires a list of " + "states with no spaces, e.g. " + "ESTABLISHED,RELATED"); + if (strlen(arg) == 0 || !parse_state(arg, strlen(arg), sinfo)) + xtables_error(PARAMETER_PROBLEM, "Bad ctstate \"%s\"", arg); +} + +static bool +conntrack_ps_state(struct xt_conntrack_mtinfo2 *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_mtinfo2 *info, const char *arg) +{ + const char *comma; + + while ((comma = strchr(arg, ',')) != NULL) { + if (comma == arg || !conntrack_ps_state(info, arg, comma - arg)) + xtables_error(PARAMETER_PROBLEM, + "Bad ctstate \"%s\"", arg); + arg = comma + 1; + } + + if (strlen(arg) == 0 || !conntrack_ps_state(info, arg, strlen(arg))) + xtables_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)) + xtables_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg); + arg = comma+1; + } + + if (strlen(arg) == 0 || !parse_status(arg, strlen(arg), sinfo)) + xtables_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg); +} + +static bool +conntrack_ps_status(struct xt_conntrack_mtinfo2 *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_mtinfo2 *info, const char *arg) +{ + const char *comma; + + while ((comma = strchr(arg, ',')) != NULL) { + if (comma == arg || !conntrack_ps_status(info, arg, comma - arg)) + xtables_error(PARAMETER_PROBLEM, + "Bad ctstatus \"%s\"", arg); + arg = comma + 1; + } + + if (strlen(arg) == 0 || !conntrack_ps_status(info, arg, strlen(arg))) + xtables_error(PARAMETER_PROBLEM, "Bad ctstatus \"%s\"", arg); +} + +static unsigned long +parse_expire(const char *s) +{ + unsigned int len; + + if (!xtables_strtoui(s, NULL, &len, 0, UINT32_MAX)) + xtables_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) + xtables_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_mtinfo2 *info, const char *s) +{ + unsigned int min, max; + char *end; + + if (!xtables_strtoui(s, &end, &min, 0, UINT32_MAX)) + xtables_param_act(XTF_BAD_VALUE, "conntrack", "--expires", s); + max = min; + if (*end == ':') + if (!xtables_strtoui(end + 1, &end, &max, 0, UINT32_MAX)) + xtables_param_act(XTF_BAD_VALUE, "conntrack", "--expires", s); + if (*end != '\0') + xtables_param_act(XTF_BAD_VALUE, "conntrack", "--expires", s); + + if (min > max) + xtables_error(PARAMETER_PROBLEM, + "expire min. range value \"%u\" greater than max. " + "range value \"%u\"", min, max); + + info->expires_min = min; + info->expires_max = max; +} + +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': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + parse_states(optarg, sinfo); + if (invert) { + sinfo->invflags |= XT_CONNTRACK_STATE; + } + sinfo->flags |= XT_CONNTRACK_STATE; + break; + + case '2': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + if(invert) + sinfo->invflags |= XT_CONNTRACK_PROTO; + + /* Canonicalize into lower case */ + for (protocol = optarg; *protocol; protocol++) + *protocol = tolower(*protocol); + + protocol = optarg; + sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum = + xtables_parse_protocol(protocol); + + if (sinfo->tuple[IP_CT_DIR_ORIGINAL].dst.protonum == 0 + && (sinfo->invflags & XT_INV_PROTO)) + xtables_error(PARAMETER_PROBLEM, + "rule would never match protocol"); + + sinfo->flags |= XT_CONNTRACK_PROTO; + break; + + case '3': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + if (invert) + sinfo->invflags |= XT_CONNTRACK_ORIGSRC; + + xtables_ipparse_any(optarg, &addrs, + &sinfo->sipmsk[IP_CT_DIR_ORIGINAL], + &naddrs); + if(naddrs > 1) + xtables_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': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + if (invert) + sinfo->invflags |= XT_CONNTRACK_ORIGDST; + + xtables_ipparse_any(optarg, &addrs, + &sinfo->dipmsk[IP_CT_DIR_ORIGINAL], + &naddrs); + if(naddrs > 1) + xtables_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': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + if (invert) + sinfo->invflags |= XT_CONNTRACK_REPLSRC; + + xtables_ipparse_any(optarg, &addrs, + &sinfo->sipmsk[IP_CT_DIR_REPLY], + &naddrs); + if(naddrs > 1) + xtables_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': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + if (invert) + sinfo->invflags |= XT_CONNTRACK_REPLDST; + + xtables_ipparse_any(optarg, &addrs, + &sinfo->dipmsk[IP_CT_DIR_REPLY], + &naddrs); + if(naddrs > 1) + xtables_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': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + parse_statuses(optarg, sinfo); + if (invert) { + sinfo->invflags |= XT_CONNTRACK_STATUS; + } + sinfo->flags |= XT_CONNTRACK_STATUS; + break; + + case '8': + xtables_check_inverse(optarg, &invert, &optind, 0, argv); + + parse_expires(optarg, 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, bool invert, unsigned int *flags, + struct xt_conntrack_mtinfo2 *info) +{ + 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 = xtables_parse_protocol(optarg); + + if (info->l4proto == 0 && (info->invert_flags & XT_INV_PROTO)) + xtables_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 (!xtables_strtoui(optarg, NULL, &port, 0, UINT16_MAX)) + xtables_param_act(XTF_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 (!xtables_strtoui(optarg, NULL, &port, 0, UINT16_MAX)) + xtables_param_act(XTF_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 (!xtables_strtoui(optarg, NULL, &port, 0, UINT16_MAX)) + xtables_param_act(XTF_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 (!xtables_strtoui(optarg, NULL, &port, 0, UINT16_MAX)) + xtables_param_act(XTF_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 */ + xtables_param_act(XTF_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 { + xtables_param_act(XTF_BAD_VALUE, "conntrack", "--ctdir", optarg); + } + break; + + default: + return false; + } + + *flags = info->match_flags; + return true; +} + +static int +conntrack_mt4_parse(int c, bool invert, unsigned int *flags, + struct xt_conntrack_mtinfo2 *info) +{ + struct in_addr *addr = NULL; + unsigned int naddrs = 0; + + switch (c) { + case '3': /* --ctorigsrc */ + xtables_ipparse_any(optarg, &addr, &info->origsrc_mask.in, + &naddrs); + if (naddrs > 1) + xtables_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 */ + xtables_ipparse_any(optarg, &addr, &info->origdst_mask.in, + &naddrs); + if (naddrs > 1) + xtables_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 */ + xtables_ipparse_any(optarg, &addr, &info->replsrc_mask.in, + &naddrs); + if (naddrs > 1) + xtables_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 */ + xtables_ipparse_any(optarg, &addr, &info->repldst_mask.in, + &naddrs); + if (naddrs > 1) + xtables_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, invert, flags, info); + } + + *flags = info->match_flags; + return true; +} + +static int +conntrack_mt6_parse(int c, bool invert, unsigned int *flags, + struct xt_conntrack_mtinfo2 *info) +{ + struct in6_addr *addr = NULL; + unsigned int naddrs = 0; + + switch (c) { + case '3': /* --ctorigsrc */ + xtables_ip6parse_any(optarg, &addr, + &info->origsrc_mask.in6, &naddrs); + if (naddrs > 1) + xtables_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 */ + xtables_ip6parse_any(optarg, &addr, + &info->origdst_mask.in6, &naddrs); + if (naddrs > 1) + xtables_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 */ + xtables_ip6parse_any(optarg, &addr, + &info->replsrc_mask.in6, &naddrs); + if (naddrs > 1) + xtables_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 */ + xtables_ip6parse_any(optarg, &addr, + &info->repldst_mask.in6, &naddrs); + if (naddrs > 1) + xtables_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, invert, flags, info); + } + + *flags = info->match_flags; + return true; +} + +#define cinfo_transform(r, l) \ + do { \ + memcpy((r), (l), offsetof(typeof(*(l)), state_mask)); \ + (r)->state_mask = (l)->state_mask; \ + (r)->status_mask = (l)->status_mask; \ + } while (false); + +static int +conntrack1_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 xt_conntrack_mtinfo2 up; + + cinfo_transform(&up, info); + if (!conntrack_mt4_parse(c, invert, flags, &up)) + return false; + cinfo_transform(info, &up); + return true; +} + +static int +conntrack1_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 xt_conntrack_mtinfo2 up; + + cinfo_transform(&up, info); + if (!conntrack_mt6_parse(c, invert, flags, &up)) + return false; + cinfo_transform(info, &up); + return true; +} + +static int +conntrack2_mt4_parse(int c, char **argv, int invert, unsigned int *flags, + const void *entry, struct xt_entry_match **match) +{ + return conntrack_mt4_parse(c, invert, flags, (void *)(*match)->data); +} + +static int +conntrack2_mt6_parse(int c, char **argv, int invert, unsigned int *flags, + const void *entry, struct xt_entry_match **match) +{ + return conntrack_mt6_parse(c, invert, flags, (void *)(*match)->data); +} + +static void conntrack_mt_check(unsigned int flags) +{ + if (flags == 0) + xtables_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 == NFPROTO_IPV4) { + if (!numeric && addr->ip == 0) { + printf("anywhere "); + return; + } + if (numeric) + printf("%s%s ", + xtables_ipaddr_to_numeric(&addr->in), + xtables_ipmask_to_numeric(&mask->in)); + else + printf("%s%s ", + xtables_ipaddr_to_anyname(&addr->in), + xtables_ipmask_to_numeric(&mask->in)); + } else if (family == NFPROTO_IPV6) { + if (!numeric && addr->ip6[0] == 0 && addr->ip6[1] == 0 && + addr->ip6[2] == 0 && addr->ip6[3] == 0) { + printf("anywhere "); + return; + } + if (numeric) + printf("%s%s ", + xtables_ip6addr_to_numeric(&addr->in6), + xtables_ip6mask_to_numeric(&mask->in6)); + else + printf("%s%s ", + xtables_ip6addr_to_anyname(&addr->in6), + xtables_ip6mask_to_numeric(&mask->in6)); + } +} + +static void +print_addr(const struct in_addr *addr, const 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) + strcpy(buf, xtables_ipaddr_to_numeric(addr)); + else + strcpy(buf, xtables_ipaddr_to_anyname(addr)); + strcat(buf, xtables_ipmask_to_numeric(mask)); + printf("%s ", buf); + } +} + +static void +matchinfo_print(const void *ip, const struct xt_entry_match *match, int numeric, const char *optpfx) +{ + const struct xt_conntrack_info *sinfo = (const 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); + } + + if (sinfo->flags & XT_CONNTRACK_DIRECTION) { + if (sinfo->invflags & XT_CONNTRACK_DIRECTION) + printf("%sctdir REPLY", optpfx); + else + printf("%sctdir ORIGINAL", optpfx); + } + +} + +static void +conntrack_dump(const struct xt_conntrack_mtinfo2 *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_ORIGSRC) + 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_ORIGDST) + 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_REPLSRC) + 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_REPLDST) + 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); + } + + if (info->match_flags & XT_CONNTRACK_DIRECTION) { + if (info->invert_flags & XT_CONNTRACK_DIRECTION) + printf("%sctdir REPLY", prefix); + else + printf("%sctdir ORIGINAL", prefix); + } +} + +static void conntrack_print(const void *ip, const struct xt_entry_match *match, + int numeric) +{ + matchinfo_print(ip, match, numeric, ""); +} + +static void +conntrack1_mt4_print(const void *ip, const struct xt_entry_match *match, + int numeric) +{ + const struct xt_conntrack_mtinfo1 *info = (void *)match->data; + struct xt_conntrack_mtinfo2 up; + + cinfo_transform(&up, info); + conntrack_dump(&up, "", NFPROTO_IPV4, numeric); +} + +static void +conntrack1_mt6_print(const void *ip, const struct xt_entry_match *match, + int numeric) +{ + const struct xt_conntrack_mtinfo1 *info = (void *)match->data; + struct xt_conntrack_mtinfo2 up; + + cinfo_transform(&up, info); + conntrack_dump(&up, "", NFPROTO_IPV6, numeric); +} + +static void +conntrack_mt_print(const void *ip, const struct xt_entry_match *match, + int numeric) +{ + conntrack_dump((const void *)match->data, "", NFPROTO_IPV4, numeric); +} + +static void +conntrack_mt6_print(const void *ip, const struct xt_entry_match *match, + int numeric) +{ + conntrack_dump((const void *)match->data, "", NFPROTO_IPV6, numeric); +} + +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, "--", NFPROTO_IPV4, true); +} + +static void conntrack_mt6_save(const void *ip, + const struct xt_entry_match *match) +{ + conntrack_dump((const void *)match->data, "--", NFPROTO_IPV6, true); +} + +static void +conntrack1_mt4_save(const void *ip, const struct xt_entry_match *match) +{ + const struct xt_conntrack_mtinfo1 *info = (void *)match->data; + struct xt_conntrack_mtinfo2 up; + + cinfo_transform(&up, info); + conntrack_dump(&up, "--", NFPROTO_IPV4, true); +} + +static void +conntrack1_mt6_save(const void *ip, const struct xt_entry_match *match) +{ + const struct xt_conntrack_mtinfo1 *info = (void *)match->data; + struct xt_conntrack_mtinfo2 up; + + cinfo_transform(&up, info); + conntrack_dump(&up, "--", NFPROTO_IPV6, true); +} + +static struct xtables_match conntrack_mt_reg[] = { + { + .version = XTABLES_VERSION, + .name = "conntrack", + .revision = 0, + .family = NFPROTO_IPV4, + .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, + }, + { + .version = XTABLES_VERSION, + .name = "conntrack", + .revision = 1, + .family = NFPROTO_IPV4, + .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), + .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), + .help = conntrack_mt_help, + .parse = conntrack1_mt4_parse, + .final_check = conntrack_mt_check, + .print = conntrack1_mt4_print, + .save = conntrack1_mt4_save, + .extra_opts = conntrack_mt_opts, + }, + { + .version = XTABLES_VERSION, + .name = "conntrack", + .revision = 1, + .family = NFPROTO_IPV6, + .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), + .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo1)), + .help = conntrack_mt_help, + .parse = conntrack1_mt6_parse, + .final_check = conntrack_mt_check, + .print = conntrack1_mt6_print, + .save = conntrack1_mt6_save, + .extra_opts = conntrack_mt_opts, + }, + { + .version = XTABLES_VERSION, + .name = "conntrack", + .revision = 2, + .family = NFPROTO_IPV4, + .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)), + .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)), + .help = conntrack_mt_help, + .parse = conntrack2_mt4_parse, + .final_check = conntrack_mt_check, + .print = conntrack_mt_print, + .save = conntrack_mt_save, + .extra_opts = conntrack_mt_opts, + }, + { + .version = XTABLES_VERSION, + .name = "conntrack", + .revision = 2, + .family = NFPROTO_IPV6, + .size = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)), + .userspacesize = XT_ALIGN(sizeof(struct xt_conntrack_mtinfo2)), + .help = conntrack_mt_help, + .parse = conntrack2_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_matches(conntrack_mt_reg, ARRAY_SIZE(conntrack_mt_reg)); +} |