| /* Library which manipulates firewall rules. Version 0.1. */ |
| |
| /* Architecture of firewall rules is as follows: |
| * |
| * Chains go INPUT, FORWARD, OUTPUT then user chains. |
| * Each user chain starts with an ERROR node. |
| * Every chain ends with an unconditional jump: a RETURN for user chains, |
| * and a POLICY for built-ins. |
| */ |
| |
| /* (C)1999 Paul ``Rusty'' Russell - Placed under the GNU GPL (See |
| COPYING for details). */ |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <arpa/inet.h> |
| |
| #ifdef DEBUG_CONNTRACK |
| #define inline |
| #endif |
| |
| #if !defined(__GLIBC__) || (__GLIBC__ < 2) |
| typedef unsigned int socklen_t; |
| #endif |
| |
| #include "libiptc/libip6tc.h" |
| |
| #define HOOK_PRE_ROUTING NF_IP6_PRE_ROUTING |
| #define HOOK_LOCAL_IN NF_IP6_LOCAL_IN |
| #define HOOK_FORWARD NF_IP6_FORWARD |
| #define HOOK_LOCAL_OUT NF_IP6_LOCAL_OUT |
| #define HOOK_POST_ROUTING NF_IP6_POST_ROUTING |
| |
| #define STRUCT_ENTRY_TARGET struct ip6t_entry_target |
| #define STRUCT_ENTRY struct ip6t_entry |
| #define STRUCT_ENTRY_MATCH struct ip6t_entry_match |
| #define STRUCT_GETINFO struct ip6t_getinfo |
| #define STRUCT_GET_ENTRIES struct ip6t_get_entries |
| #define STRUCT_COUNTERS struct ip6t_counters |
| #define STRUCT_COUNTERS_INFO struct ip6t_counters_info |
| #define STRUCT_STANDARD_TARGET struct ip6t_standard_target |
| #define STRUCT_REPLACE struct ip6t_replace |
| |
| #define STRUCT_TC_HANDLE struct ip6tc_handle |
| #define TC_HANDLE_T ip6tc_handle_t |
| |
| #define ENTRY_ITERATE IP6T_ENTRY_ITERATE |
| #define TABLE_MAXNAMELEN IP6T_TABLE_MAXNAMELEN |
| #define FUNCTION_MAXNAMELEN IP6T_FUNCTION_MAXNAMELEN |
| |
| #define GET_TARGET ip6t_get_target |
| |
| #define ERROR_TARGET IP6T_ERROR_TARGET |
| #define NUMHOOKS NF_IP6_NUMHOOKS |
| |
| #define IPT_CHAINLABEL ip6t_chainlabel |
| |
| #define TC_DUMP_ENTRIES dump_entries6 |
| #define TC_IS_CHAIN ip6tc_is_chain |
| #define TC_NEXT_CHAIN ip6tc_next_chain |
| #define TC_NUM_RULES ip6tc_num_rules |
| #define TC_GET_RULE ip6tc_get_rule |
| #define TC_GET_TARGET ip6tc_get_target |
| #define TC_BUILTIN ip6tc_builtin |
| #define TC_GET_POLICY ip6tc_get_policy |
| #define TC_INSERT_ENTRY ip6tc_insert_entry |
| #define TC_REPLACE_ENTRY ip6tc_replace_entry |
| #define TC_APPEND_ENTRY ip6tc_append_entry |
| #define TC_DELETE_ENTRY ip6tc_delete_entry |
| #define TC_DELETE_NUM_ENTRY ip6tc_delete_num_entry |
| #define TC_CHECK_PACKET ip6tc_check_packet |
| #define TC_FLUSH_ENTRIES ip6tc_flush_entries |
| #define TC_ZERO_ENTRIES ip6tc_zero_entries |
| #define TC_CREATE_CHAIN ip6tc_create_chain |
| #define TC_GET_REFERENCES ip6tc_get_references |
| #define TC_DELETE_CHAIN ip6tc_delete_chain |
| #define TC_RENAME_CHAIN ip6tc_rename_chain |
| #define TC_SET_POLICY ip6tc_set_policy |
| #define TC_GET_RAW_SOCKET ip6tc_get_raw_socket |
| #define TC_INIT ip6tc_init |
| #define TC_COMMIT ip6tc_commit |
| #define TC_STRERROR ip6tc_strerror |
| |
| #define TC_AF AF_INET6 |
| #define TC_IPPROTO IPPROTO_IPV6 |
| |
| #define SO_SET_REPLACE IP6T_SO_SET_REPLACE |
| #define SO_SET_ADD_COUNTERS IP6T_SO_SET_ADD_COUNTERS |
| #define SO_GET_INFO IP6T_SO_GET_INFO |
| #define SO_GET_ENTRIES IP6T_SO_GET_ENTRIES |
| #define SO_GET_VERSION IP6T_SO_GET_VERSION |
| |
| #define STANDARD_TARGET IP6T_STANDARD_TARGET |
| #define LABEL_RETURN IP6TC_LABEL_RETURN |
| #define LABEL_ACCEPT IP6TC_LABEL_ACCEPT |
| #define LABEL_DROP IP6TC_LABEL_DROP |
| |
| #define ALIGN IP6T_ALIGN |
| #define RETURN IP6T_RETURN |
| |
| #include "libiptc.c" |
| |
| #define BIT6(a, l) \ |
| (((a->in6_u.u6_addr32[(l) / 32]) >> ((l) & 31)) & 1) |
| |
| int |
| ipv6_prefix_length(const struct in6_addr *a) |
| { |
| int l, i; |
| for (l = 0; l < 128; l++) { |
| if (BIT6(a, l) == 0) |
| break; |
| } |
| for (i = l + 1; i < 128; i++) { |
| if (BIT6(a, i) == 1) |
| return -1; |
| } |
| return l; |
| } |
| |
| static int |
| dump_entry(struct ip6t_entry *e, const ip6tc_handle_t handle) |
| { |
| size_t i; |
| char buf[40]; |
| int len; |
| struct ip6t_entry_target *t; |
| |
| printf("Entry %u (%lu):\n", entry2index(handle, e), |
| entry2offset(handle, e)); |
| puts("SRC IP: "); |
| inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof buf); |
| puts(buf); |
| putchar('/'); |
| len = ipv6_prefix_length(&e->ipv6.smsk); |
| if (len != -1) |
| printf("%d", len); |
| else { |
| inet_ntop(AF_INET6, &e->ipv6.smsk, buf, sizeof buf); |
| puts(buf); |
| } |
| putchar('\n'); |
| |
| puts("DST IP: "); |
| inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof buf); |
| puts(buf); |
| putchar('/'); |
| len = ipv6_prefix_length(&e->ipv6.dmsk); |
| if (len != -1) |
| printf("%d", len); |
| else { |
| inet_ntop(AF_INET6, &e->ipv6.dmsk, buf, sizeof buf); |
| puts(buf); |
| } |
| putchar('\n'); |
| |
| printf("Interface: `%s'/", e->ipv6.iniface); |
| for (i = 0; i < IFNAMSIZ; i++) |
| printf("%c", e->ipv6.iniface_mask[i] ? 'X' : '.'); |
| printf("to `%s'/", e->ipv6.outiface); |
| for (i = 0; i < IFNAMSIZ; i++) |
| printf("%c", e->ipv6.outiface_mask[i] ? 'X' : '.'); |
| printf("\nProtocol: %u\n", e->ipv6.proto); |
| if (e->ipv6.flags & IP6T_F_TOS) |
| printf("TOS: %u\n", e->ipv6.tos); |
| printf("Flags: %02X\n", e->ipv6.flags); |
| printf("Invflags: %02X\n", e->ipv6.invflags); |
| printf("Counters: %llu packets, %llu bytes\n", |
| e->counters.pcnt, e->counters.bcnt); |
| printf("Cache: %08X ", e->nfcache); |
| if (e->nfcache & NFC_ALTERED) printf("ALTERED "); |
| if (e->nfcache & NFC_UNKNOWN) printf("UNKNOWN "); |
| if (e->nfcache & NFC_IP6_SRC) printf("IP6_SRC "); |
| if (e->nfcache & NFC_IP6_DST) printf("IP6_DST "); |
| if (e->nfcache & NFC_IP6_IF_IN) printf("IP6_IF_IN "); |
| if (e->nfcache & NFC_IP6_IF_OUT) printf("IP6_IF_OUT "); |
| if (e->nfcache & NFC_IP6_TOS) printf("IP6_TOS "); |
| if (e->nfcache & NFC_IP6_PROTO) printf("IP6_PROTO "); |
| if (e->nfcache & NFC_IP6_OPTIONS) printf("IP6_OPTIONS "); |
| if (e->nfcache & NFC_IP6_TCPFLAGS) printf("IP6_TCPFLAGS "); |
| if (e->nfcache & NFC_IP6_SRC_PT) printf("IP6_SRC_PT "); |
| if (e->nfcache & NFC_IP6_DST_PT) printf("IP6_DST_PT "); |
| if (e->nfcache & NFC_IP6_PROTO_UNKNOWN) printf("IP6_PROTO_UNKNOWN "); |
| printf("\n"); |
| |
| IP6T_MATCH_ITERATE(e, print_match); |
| |
| t = ip6t_get_target(e); |
| printf("Target name: `%s' [%u]\n", t->u.name, t->target_size); |
| if (strcmp(t->u.name, IP6T_STANDARD_TARGET) == 0) { |
| int pos = *(int *)t->data; |
| if (pos < 0) |
| printf("verdict=%s\n", |
| pos == -NF_ACCEPT-1 ? "NF_ACCEPT" |
| : pos == -NF_DROP-1 ? "NF_DROP" |
| : pos == IP6T_RETURN ? "RETURN" |
| : "UNKNOWN"); |
| else |
| printf("verdict=%u\n", pos); |
| } else if (strcmp(t->u.name, IP6T_ERROR_TARGET) == 0) |
| printf("error=`%s'\n", t->data); |
| |
| printf("\n"); |
| return 0; |
| } |
| |
| static inline int |
| is_same(const struct STRUCT_ENTRY *a, const struct STRUCT_ENTRY *b, |
| unsigned char *matchmask) |
| { |
| unsigned int i; |
| struct STRUCT_ENTRY_TARGET *ta, *tb; |
| unsigned char *mptr; |
| |
| /* Always compare head structures: ignore mask here. */ |
| if (memcmp(&a->ipv6.src, &b->ipv6.src, sizeof(struct in6_addr)) |
| || memcmp(&a->ipv6.dst, &b->ipv6.dst, sizeof(struct in6_addr)) |
| || memcmp(&a->ipv6.smsk, &b->ipv6.smsk, sizeof(struct in6_addr)) |
| || memcmp(&a->ipv6.dmsk, &b->ipv6.dmsk, sizeof(struct in6_addr)) |
| || a->ipv6.proto != b->ipv6.proto |
| || a->ipv6.tos != b->ipv6.tos |
| || a->ipv6.flags != b->ipv6.flags |
| || a->ipv6.invflags != b->ipv6.invflags) |
| return 0; |
| |
| for (i = 0; i < IFNAMSIZ; i++) { |
| if (a->ipv6.iniface_mask[i] != b->ipv6.iniface_mask[i]) |
| return 0; |
| if ((a->ipv6.iniface[i] & a->ipv6.iniface_mask[i]) |
| != (b->ipv6.iniface[i] & b->ipv6.iniface_mask[i])) |
| return 0; |
| if (a->ipv6.outiface_mask[i] != b->ipv6.outiface_mask[i]) |
| return 0; |
| if ((a->ipv6.outiface[i] & a->ipv6.outiface_mask[i]) |
| != (b->ipv6.outiface[i] & b->ipv6.outiface_mask[i])) |
| return 0; |
| } |
| |
| if (a->nfcache != b->nfcache |
| || a->target_offset != b->target_offset |
| || a->next_offset != b->next_offset) |
| return 0; |
| |
| mptr = matchmask + sizeof(struct STRUCT_ENTRY); |
| if (IP6T_MATCH_ITERATE(a, match_different, a->elems, b->elems)) |
| return 0; |
| |
| ta = GET_TARGET((struct STRUCT_ENTRY *)a); |
| tb = GET_TARGET((struct STRUCT_ENTRY *)b); |
| if (ta->target_size != tb->target_size) |
| return 0; |
| if (strcmp(ta->u.name, tb->u.name) != 0) |
| return 0; |
| mptr += sizeof(*ta); |
| |
| if (target_different(ta->data, tb->data, |
| ta->u.target_size - sizeof(*ta), mptr)) |
| return 0; |
| |
| return 1; |
| } |