diff options
Diffstat (limited to 'mroute.c')
| -rw-r--r-- | mroute.c | 429 |
1 files changed, 0 insertions, 429 deletions
diff --git a/mroute.c b/mroute.c deleted file mode 100644 index 3debd80..0000000 --- a/mroute.c +++ /dev/null @@ -1,429 +0,0 @@ -/* - * OpenVPN -- An application to securely tunnel IP networks - * over a single TCP/UDP port, with support for SSL/TLS-based - * session authentication and key exchange, - * packet encryption, packet authentication, and - * packet compression. - * - * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 - * as published by the Free Software Foundation. - * - * 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 (see the file COPYING included with this - * distribution); if not, write to the Free Software Foundation, Inc., - * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -#include "syshead.h" - -#if P2MP_SERVER - -#include "mroute.h" -#include "proto.h" -#include "error.h" -#include "socket.h" - -#include "memdbg.h" - -void -mroute_addr_init (struct mroute_addr *addr) -{ - CLEAR (*addr); -} - -/* - * Ethernet multicast addresses. - */ - -static inline bool -is_mac_mcast_addr (const uint8_t *mac) -{ - return (bool) mac[0] & 1; -} - -static inline bool -is_mac_mcast_maddr (const struct mroute_addr *addr) -{ - return (addr->type & MR_ADDR_MASK) == MR_ADDR_ETHER && is_mac_mcast_addr (addr->addr); -} - -/* - * Don't learn certain addresses. - */ -bool -mroute_learnable_address (const struct mroute_addr *addr) -{ - int i; - bool not_all_zeros = false; - bool not_all_ones = false; - - for (i = 0; i < addr->len; ++i) - { - int b = addr->addr[i]; - if (b != 0x00) - not_all_zeros = true; - if (b != 0xFF) - not_all_ones = true; - } - return not_all_zeros && not_all_ones && !is_mac_mcast_maddr (addr); -} - -static inline void -mroute_get_in_addr_t (struct mroute_addr *ma, const in_addr_t src, unsigned int mask) -{ - if (ma) - { - ma->type = MR_ADDR_IPV4 | mask; - ma->netbits = 0; - ma->len = 4; - *(in_addr_t*)ma->addr = src; - } -} - -static inline bool -mroute_is_mcast (const in_addr_t addr) -{ - return ((addr & htonl(IP_MCAST_SUBNET_MASK)) == htonl(IP_MCAST_NETWORK)); -} - -#ifdef ENABLE_PF - -static unsigned int -mroute_extract_addr_arp (struct mroute_addr *src, - struct mroute_addr *dest, - const struct buffer *buf) -{ - unsigned int ret = 0; - if (BLEN (buf) >= (int) sizeof (struct openvpn_arp)) - { - const struct openvpn_arp *arp = (const struct openvpn_arp *) BPTR (buf); - if (arp->mac_addr_type == htons(0x0001) - && arp->proto_addr_type == htons(0x0800) - && arp->mac_addr_size == 0x06 - && arp->proto_addr_size == 0x04) - { - mroute_get_in_addr_t (src, arp->ip_src, MR_ARP); - mroute_get_in_addr_t (dest, arp->ip_dest, MR_ARP); - - /* multicast packet? */ - if (mroute_is_mcast (arp->ip_dest)) - ret |= MROUTE_EXTRACT_MCAST; - - ret |= MROUTE_EXTRACT_SUCCEEDED; - } - } - return ret; -} - -#endif - -unsigned int -mroute_extract_addr_ipv4 (struct mroute_addr *src, - struct mroute_addr *dest, - const struct buffer *buf) -{ - unsigned int ret = 0; - if (BLEN (buf) >= 1) - { - switch (OPENVPN_IPH_GET_VER (*BPTR(buf))) - { - case 4: - if (BLEN (buf) >= (int) sizeof (struct openvpn_iphdr)) - { - const struct openvpn_iphdr *ip = (const struct openvpn_iphdr *) BPTR (buf); - - mroute_get_in_addr_t (src, ip->saddr, 0); - mroute_get_in_addr_t (dest, ip->daddr, 0); - - /* multicast packet? */ - if (mroute_is_mcast (ip->daddr)) - ret |= MROUTE_EXTRACT_MCAST; - - /* IGMP message? */ - if (ip->protocol == OPENVPN_IPPROTO_IGMP) - ret |= MROUTE_EXTRACT_IGMP; - - ret |= MROUTE_EXTRACT_SUCCEEDED; - } - break; - case 6: - { - msg (M_WARN, "Need IPv6 code in mroute_extract_addr_from_packet"); - break; - } - } - } - return ret; -} - -unsigned int -mroute_extract_addr_ether (struct mroute_addr *src, - struct mroute_addr *dest, - struct mroute_addr *esrc, - struct mroute_addr *edest, - const struct buffer *buf) -{ - unsigned int ret = 0; - if (BLEN (buf) >= (int) sizeof (struct openvpn_ethhdr)) - { - const struct openvpn_ethhdr *eth = (const struct openvpn_ethhdr *) BPTR (buf); - if (src) - { - src->type = MR_ADDR_ETHER; - src->netbits = 0; - src->len = 6; - memcpy (src->addr, eth->source, 6); - } - if (dest) - { - dest->type = MR_ADDR_ETHER; - dest->netbits = 0; - dest->len = 6; - memcpy (dest->addr, eth->dest, 6); - - /* ethernet broadcast/multicast packet? */ - if (is_mac_mcast_addr (eth->dest)) - ret |= MROUTE_EXTRACT_BCAST; - } - - ret |= MROUTE_EXTRACT_SUCCEEDED; - -#ifdef ENABLE_PF - if (esrc || edest) - { - struct buffer b = *buf; - if (buf_advance (&b, sizeof (struct openvpn_ethhdr))) - { - switch (ntohs (eth->proto)) - { - case OPENVPN_ETH_P_IPV4: - ret |= (mroute_extract_addr_ipv4 (esrc, edest, &b) << MROUTE_SEC_SHIFT); - break; - case OPENVPN_ETH_P_ARP: - ret |= (mroute_extract_addr_arp (esrc, edest, &b) << MROUTE_SEC_SHIFT); - break; - } - } - } -#endif - } - return ret; -} - -/* - * Translate a struct openvpn_sockaddr (osaddr) - * to a struct mroute_addr (addr). - */ -bool mroute_extract_openvpn_sockaddr (struct mroute_addr *addr, - const struct openvpn_sockaddr *osaddr, - bool use_port) -{ - if (osaddr->sa.sin_family == AF_INET) - { - if (use_port) - { - addr->type = MR_ADDR_IPV4 | MR_WITH_PORT; - addr->netbits = 0; - addr->len = 6; - memcpy (addr->addr, &osaddr->sa.sin_addr.s_addr, 4); - memcpy (addr->addr + 4, &osaddr->sa.sin_port, 2); - } - else - { - addr->type = MR_ADDR_IPV4; - addr->netbits = 0; - addr->len = 4; - memcpy (addr->addr, &osaddr->sa.sin_addr.s_addr, 4); - } - return true; - } - return false; -} - -/* - * Zero off the host bits in an address, leaving - * only the network bits, using the netbits member of - * struct mroute_addr as the controlling parameter. - */ -void -mroute_addr_mask_host_bits (struct mroute_addr *ma) -{ - in_addr_t addr = ntohl(*(in_addr_t*)ma->addr); - ASSERT ((ma->type & MR_ADDR_MASK) == MR_ADDR_IPV4); - addr &= netbits_to_netmask (ma->netbits); - *(in_addr_t*)ma->addr = htonl (addr); -} - -/* - * The mroute_addr hash function takes into account the - * address type, number of bits in the network address, - * and the actual address. - */ -uint32_t -mroute_addr_hash_function (const void *key, uint32_t iv) -{ - return hash_func (mroute_addr_hash_ptr ((const struct mroute_addr *) key), - mroute_addr_hash_len ((const struct mroute_addr *) key), - iv); -} - -bool -mroute_addr_compare_function (const void *key1, const void *key2) -{ - return mroute_addr_equal ((const struct mroute_addr *) key1, - (const struct mroute_addr *) key2); -} - -const char * -mroute_addr_print (const struct mroute_addr *ma, - struct gc_arena *gc) -{ - return mroute_addr_print_ex (ma, MAPF_IA_EMPTY_IF_UNDEF, gc); -} - -const char * -mroute_addr_print_ex (const struct mroute_addr *ma, - const unsigned int flags, - struct gc_arena *gc) -{ - struct buffer out = alloc_buf_gc (64, gc); - if (ma) - { - struct mroute_addr maddr = *ma; - - switch (maddr.type & MR_ADDR_MASK) - { - case MR_ADDR_ETHER: - buf_printf (&out, "%s", format_hex_ex (ma->addr, 6, 0, 1, ":", gc)); - break; - case MR_ADDR_IPV4: - { - struct buffer buf; - in_addr_t addr; - int port; - bool status; - buf_set_read (&buf, maddr.addr, maddr.len); - addr = buf_read_u32 (&buf, &status); - if (status) - { - if ((flags & MAPF_SHOW_ARP) && (maddr.type & MR_ARP)) - buf_printf (&out, "ARP/"); - buf_printf (&out, "%s", print_in_addr_t (addr, (flags & MAPF_IA_EMPTY_IF_UNDEF) ? IA_EMPTY_IF_UNDEF : 0, gc)); - if (maddr.type & MR_WITH_NETBITS) - { - if (flags & MAPF_SUBNET) - { - const in_addr_t netmask = netbits_to_netmask (maddr.netbits); - buf_printf (&out, "/%s", print_in_addr_t (netmask, 0, gc)); - } - else - buf_printf (&out, "/%d", maddr.netbits); - } - } - if (maddr.type & MR_WITH_PORT) - { - port = buf_read_u16 (&buf); - if (port >= 0) - buf_printf (&out, ":%d", port); - } - } - break; - case MR_ADDR_IPV6: - buf_printf (&out, "IPV6"); - break; - default: - buf_printf (&out, "UNKNOWN"); - break; - } - return BSTR (&out); - } - else - return "[NULL]"; -} - -/* - * mroute_helper's main job is keeping track of - * currently used CIDR netlengths, so we don't - * have to cycle through all 33. - */ - -struct mroute_helper * -mroute_helper_init (int ageable_ttl_secs) -{ - struct mroute_helper *mh; - ALLOC_OBJ_CLEAR (mh, struct mroute_helper); - mh->ageable_ttl_secs = ageable_ttl_secs; - return mh; -} - -static void -mroute_helper_regenerate (struct mroute_helper *mh) -{ - int i, j = 0; - for (i = MR_HELPER_NET_LEN - 1; i >= 0; --i) - { - if (mh->net_len_refcount[i] > 0) - mh->net_len[j++] = (uint8_t) i; - } - mh->n_net_len = j; - -#ifdef ENABLE_DEBUG - if (check_debug_level (D_MULTI_DEBUG)) - { - struct gc_arena gc = gc_new (); - struct buffer out = alloc_buf_gc (256, &gc); - buf_printf (&out, "MROUTE CIDR netlen:"); - for (i = 0; i < mh->n_net_len; ++i) - { - buf_printf (&out, " /%d", mh->net_len[i]); - } - dmsg (D_MULTI_DEBUG, "%s", BSTR (&out)); - gc_free (&gc); - } -#endif -} - -void -mroute_helper_add_iroute (struct mroute_helper *mh, const struct iroute *ir) -{ - if (ir->netbits >= 0) - { - ASSERT (ir->netbits < MR_HELPER_NET_LEN); - ++mh->cache_generation; - ++mh->net_len_refcount[ir->netbits]; - if (mh->net_len_refcount[ir->netbits] == 1) - mroute_helper_regenerate (mh); - } -} - -void -mroute_helper_del_iroute (struct mroute_helper *mh, const struct iroute *ir) -{ - if (ir->netbits >= 0) - { - ASSERT (ir->netbits < MR_HELPER_NET_LEN); - ++mh->cache_generation; - --mh->net_len_refcount[ir->netbits]; - ASSERT (mh->net_len_refcount[ir->netbits] >= 0); - if (!mh->net_len_refcount[ir->netbits]) - mroute_helper_regenerate (mh); - } -} - -void -mroute_helper_free (struct mroute_helper *mh) -{ - free (mh); -} - -#else -static void dummy(void) {} -#endif /* P2MP_SERVER */ |