/* $Id: pipex_local.h,v 1.4 2010/01/13 07:23:38 yasuoka Exp $ */ /* * Copyright (c) 2009 Internet Initiative Japan Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifdef __OpenBSD__ #define Static #else #define Static static #endif #define PIPEX_PPTP 1 #define PIPEX_PPPOE 1 #define PIPEX_MPPE 1 #define PIPEX_ENABLED 0x0001 #ifndef LOG_PPPAC #define LOG_PPPAC LOG_KERN #endif /* compile time option constants */ #ifndef PIPEX_MAX_SESSION #define PIPEX_MAX_SESSION 512 #endif #define PIPEX_HASH_DIV 8 #define PIPEX_HASH_SIZE (PIPEX_MAX_SESSION/PIPEX_HASH_DIV) #define PIPEX_HASH_MASK (PIPEX_HASH_SIZE-1) #define PIPEX_CLOSE_TIMEOUT 30 #define PIPEX_DEQUEUE_LIMIT (IFQ_MAXLEN >> 1) #define PIPEX_PPPMINLEN 5 /* minimum PPP header length is 1 and minimum ppp payload length is 4 */ #ifndef NNBY /* usually defined on the */ #define NNBY 8 /* number of bits of a byte */ #endif #ifdef PIPEX_MPPE /* mppe rc4 key */ struct pipex_mppe { int16_t stateless:1, /* key change mode */ resetreq:1, reserved:14; int16_t keylenbits; /* key length */ int16_t keylen; uint16_t coher_cnt; /* cohency counter */ struct rc4_ctx rc4ctx; u_char master_key[PIPEX_MPPE_KEYLEN]; /* master key of MPPE */ u_char session_key[PIPEX_MPPE_KEYLEN]; /* session key of MPPE */ }; #endif /* PIPEX_MPPE */ #ifdef PIPEX_PPPOE struct pipex_pppoe_session { struct ifnet *over_ifp; /* ether inteface */ struct sockaddr peer_addr; /* peer's sockaddr */ }; #endif /* PIPEX_PPPOE */ #ifdef PIPEX_PPTP struct pipex_pptp_session { /* sequence number gap between pipex and userland */ int32_t snd_gap; /* gap of our sequence */ int32_t rcv_gap; /* gap of peer's sequence */ int32_t ul_snd_una; /* userland send acked seq */ uint32_t snd_nxt; /* send next */ uint32_t rcv_nxt; /* receive next */ uint32_t snd_una; /* send acked sequence */ uint32_t rcv_acked; /* recv acked sequence */ int winsz; /* windows size */ int maxwinsz; /* max windows size */ int peer_maxwinsz; /* peer's max windows size */ struct in_addr peer_address; /* inet destination address */ struct in_addr our_address; /* inet source address */ }; #endif /* PIPEX_PPTP */ /* pppac ip-extension sessoin table */ struct pipex_session { struct radix_node ps4_rn[2]; /* tree glue, and other values */ LIST_ENTRY(pipex_session) session_list; /* all session chain */ LIST_ENTRY(pipex_session) state_list; /* state list chain */ LIST_ENTRY(pipex_session) id_chain; /* id hash chain */ LIST_ENTRY(pipex_session) peer_addr_chain; /* peer's address hash chain */ uint16_t state; /* pipex session state */ #define PIPEX_STATE_INITIAL 0x0000 #define PIPEX_STATE_OPENED 0x0001 #define PIPEX_STATE_CLOSE_WAIT 0x0002 #define PIPEX_STATE_CLOSED 0x0003 uint16_t ip_forward:1, /* {en|dis}ableIP forwarding */ is_multicast:1, /* virtual entry for mutlicast */ reserved:14; uint16_t protocol; /* tunnel protocol (PK) */ uint16_t session_id; /* session-id (PK) */ uint16_t peer_session_id; /* peer's session-id */ uint16_t peer_mru; /* peer's MRU */ uint32_t timeout_sec; /* idle timeout */ int ppp_id; /* PPP id */ struct sockaddr_in ip_address; /* remote address (AK) */ struct sockaddr_in ip_netmask; /* remote address mask (AK) */ struct pipex_iface_context* pipex_iface;/* context for interface */ uint32_t ppp_flags; /* configure flags */ #ifdef PIPEX_MPPE int ccp_id; /* CCP packet id */ struct pipex_mppe mppe_recv, /* MPPE context for incoming */ mppe_send; /* MPPE context for outgoing */ #endif /*PIPEXMPPE */ struct pipex_statistics stat; /* statistics */ union { #ifdef PIPEX_PPPOE struct pipex_pppoe_session pppoe; /* context for PPPoE */ #endif /* PIPEX_PPPOE */ #ifdef PIPEX_PPTP struct pipex_pptp_session pptp; /* context for PPTP */ #endif /* PIPEX_PPTP */ char _proto_unknown[0]; } proto; }; /* gre header */ struct pipex_gre_header { uint16_t flags; /* flags and version*/ #define PIPEX_GRE_KFLAG 0x2000 /* keys present */ #define PIPEX_GRE_SFLAG 0x1000 /* seq present */ #define PIPEX_GRE_AFLAG 0x0080 /* ack present */ #define PIPEX_GRE_VER 0x0001 /* gre version code */ #define PIPEX_GRE_VERMASK 0x0003 /* gre version mask */ uint16_t type; #define PIPEX_GRE_PROTO_PPP 0x880b /* gre/ppp */ uint16_t len; /* length not include gre header */ uint16_t call_id; /* call_id */ } __attribute__((__packed__)); /* pppoe header */ struct pipex_pppoe_header { uint8_t vertype; /* version and type */ #define PIPEX_PPPOE_VERTYPE 0x11 /* version and type code */ uint8_t code; /* code */ #define PIPEX_PPPOE_CODE_SESSION 0x00 /* code session */ uint16_t session_id; /* session id */ uint16_t length; /* length */ } __attribute__((__packed__)); #ifdef PIPEX_DEBUG #define PIPEX_DBG(a) if (pipex_debug & 1) pipex_session_log a /* #define PIPEX_MPPE_DBG(a) if (pipex_debug & 1) pipex_session_log a */ #define PIPEX_MPPE_DBG(a) #else #define PIPEX_DBG(a) #define PIPEX_MPPE_DBG(a) #endif /* PIPEX_DEBUG */ #define PIPEX_ID_HASHTABLE(key) \ (&pipex_id_hashtable[(key) & PIPEX_HASH_MASK]) #define PIPEX_PEER_ADDR_HASHTABLE(key) \ (&pipex_peer_addr_hashtable[ntohl((key)) & PIPEX_HASH_MASK]) #define PIPEX_ADDR_HASHTABLE(key) \ (&pipex_addr_hashtable[ntohl((key)) & PIPEX_HASH_MASK]) #define GETCHAR(c, cp) do { \ (c) = *(cp)++; \ } while (0) #define PUTCHAR(s, cp) do { \ *(cp)++ = (u_char)(s); \ } while (0) #define GETSHORT(s, cp) do { \ (s) = *(cp)++ << 8; \ (s) |= *(cp)++; \ } while (0) #define PUTSHORT(s, cp) do { \ *(cp)++ = (u_char) ((s) >> 8); \ *(cp)++ = (u_char) (s); \ } while (0) #define GETLONG(l, cp) do { \ (l) = *(cp)++ << 8; \ (l) |= *(cp)++; (l) <<= 8; \ (l) |= *(cp)++; (l) <<= 8; \ (l) |= *(cp)++; \ } while (0) #define PUTLONG(l, cp) do { \ *(cp)++ = (u_char) ((l) >> 24); \ *(cp)++ = (u_char) ((l) >> 16); \ *(cp)++ = (u_char) ((l) >> 8); \ *(cp)++ = (u_char) (l); \ } while (0) #define PIPEX_PULLUP(m0, l) \ if ((m0)->m_len < (l)) { \ if ((m0)->m_pkthdr.len < (l)) { \ PIPEX_DBG((NULL, LOG_DEBUG, \ "<%s> received packet is too short.", \ __func__)); \ m_freem(m0); \ (m0) = NULL; \ } else { \ (m0) = m_pullup((m0), (l)); \ KASSERT((m0) != NULL); \ } \ } #define PIPEX_SEEK_NEXTHDR(ptr, len, t) \ ((t) (((char *)ptr) + len)) #define SEQ32_LT(a,b) ((int)((a) - (b)) < 0) #define SEQ32_LE(a,b) ((int)((a) - (b)) <= 0) #define SEQ32_GT(a,b) ((int)((a) - (b)) > 0) #define SEQ32_GE(a,b) ((int)((a) - (b)) >= 0) #define SEQ32_SUB(a,b) ((int32_t)((a) - (b))) #define pipex_session_is_acfc_accepted(s) \ (((s)->ppp_flags & PIPEX_PPP_ACFC_ACCEPTED)? 1 : 0) #define pipex_session_is_pfc_accepted(s) \ (((s)->ppp_flags & PIPEX_PPP_PFC_ACCEPTED)? 1 : 0) #define pipex_session_is_acfc_enabled(s) \ (((s)->ppp_flags & PIPEX_PPP_ACFC_ENABLED)? 1 : 0) #define pipex_session_is_pfc_enabled(s) \ (((s)->ppp_flags & PIPEX_PPP_PFC_ENABLED)? 1 : 0) #define pipex_session_has_acf(s) \ (((s)->ppp_flags & PIPEX_PPP_HAS_ACF)? 1 : 0) #define pipex_session_is_mppe_accepted(s) \ (((s)->ppp_flags & PIPEX_PPP_MPPE_ACCEPTED)? 1 : 0) #define pipex_session_is_mppe_enabled(s) \ (((s)->ppp_flags & PIPEX_PPP_MPPE_ENABLED)? 1 : 0) #define pipex_session_is_mppe_required(s) \ (((s)->ppp_flags & PIPEX_PPP_MPPE_REQUIRED)? 1 : 0) #define pipex_mppe_rc4_keybits(r) ((r)->keylen << 3) #define PIPEX_IPGRE_HDRLEN (sizeof(struct ip) + sizeof(struct pipex_gre_header)) #define PIPEX_TCP_OPTLEN 40 /* * static function prototypes */ Static int pipex_add_session (struct pipex_session_req *, struct pipex_iface_context *); Static int pipex_close_session (struct pipex_session_close_req *); Static int pipex_config_session (struct pipex_session_config_req *); Static int pipex_get_stat (struct pipex_session_stat_req *); Static int pipex_get_closed (struct pipex_session_list_req *); Static int pipex_destroy_session (struct pipex_session *); Static struct pipex_session *pipex_lookup_by_ip_address (struct in_addr); Static struct pipex_session *pipex_lookup_by_session_id (int, int); Static void pipex_ppp_output (struct mbuf *, struct pipex_session *, int); Static inline int pipex_ppp_proto (struct mbuf *, struct pipex_session *, int, int *); Static void pipex_ppp_input (struct mbuf *, struct pipex_session *, int); Static void pipex_ip_input (struct mbuf *, struct pipex_session *); #ifdef PIPEX_PPPOE Static void pipex_pppoe_output (struct mbuf *, struct pipex_session *); #endif #ifdef PIPEX_PPTP Static void pipex_pptp_output (struct mbuf *, struct pipex_session *, int, int); #endif #ifdef PIPEX_MPPE Static void pipex_mppe_req_init (struct pipex_mppe_req *, struct pipex_mppe *); Static void GetNewKeyFromSHA (u_char *, u_char *, int, u_char *); Static void pipex_mppe_reduce_key (struct pipex_mppe *); Static void mppe_key_change (struct pipex_mppe *); Static void pipex_mppe_input (struct mbuf *, struct pipex_session *); Static void pipex_mppe_output (struct mbuf *, struct pipex_session *); Static void pipex_ccp_input (struct mbuf *, struct pipex_session *); Static int pipex_ccp_output (struct pipex_session *, int, int); #endif Static struct mbuf *adjust_tcp_mss (struct mbuf *, int); Static struct mbuf *ip_is_idle_packet (struct mbuf *, int *); Static void pipex_session_log (struct pipex_session *, int, const char *, ...) __attribute__((__format__(__printf__,3,4))); Static int pipex_ppp_enqueue (struct mbuf *, struct pipex_session *, struct ifqueue *); Static void pipex_ppp_dequeue (void); Static void pipex_timer_start (void); Static void pipex_timer_stop (void); Static void pipex_timer (void *);