IPv6 enhancements.

1 files changed, 264 insertions, 0 deletions

diff --git a/libiptc/libip6tc.c b/libiptc/libip6tc.c
new file mode 100644
index 00000000..033693ff
--- /dev/null
+++ b/libiptc/libip6tc.c
@@ -0,0 +1,264 @@
+/* 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;
+}