319 lines
9.0 KiB
C
319 lines
9.0 KiB
C
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#ifndef _TYPES_H_
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#define _TYPES_H_
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#ifdef __cpluscplus
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extern "C"
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{
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#endif
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <linux/if_ether.h>
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enum addr_type
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{
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ADDR_TYPE_UNKNOWN,
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ADDR_TYPE_MAC,
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ADDR_TYPE_ARP,
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ADDR_TYPE_IPV4,
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ADDR_TYPE_IPV6,
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ADDR_TYPE_TCP,
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ADDR_TYPE_UDP,
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ADDR_TYPE_ICMPV4,
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ADDR_TYPE_ICMPV6,
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ADDR_TYPE_PPTP,
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ADDR_TYPE_L2TP,
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ADDR_TYPE_SOCKS,
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ADDR_TYPE_GTPU,
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ADDR_TYPE_PPPOE,
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ADDR_TYPE_GRE,
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ADDR_TYPE_VLAN,
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ADDR_TYPE_MPLS,
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ADDR_TYPE_PPP,
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ADDR_TYPE_VXLAN,
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ADDR_TYPE_MAX
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};
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struct layer_addr_mac
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{
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struct ethhdr smac;
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struct ethhdr dmac;
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};
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struct layer_addr_ipv4
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{
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uint32_t saddr; /* network order */
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uint32_t daddr; /* network order */
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};
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struct layer_addr_ipv6
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{
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struct in6_addr saddr;
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struct in6_addr daddr ;
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};
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struct layer_addr_tuple4
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{
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struct layer_addr_ipv4 ipv4;
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uint16_t source; /* network order */
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uint16_t dest; /* network order */
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};
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struct layer_addr_tuple6
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{
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struct layer_addr_ipv6 ipv6;
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uint16_t source; /* network order */
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uint16_t dest; /* network order */
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};
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/*
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* https://datatracker.ietf.org/doc/html/rfc2637
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* https://wwwdisc.chimica.unipd.it/luigino.feltre/pubblica/unix/winnt_doc/pppt/understanding_pptp.html#:~:text=Introduction-,Point%2Dto%2DPoint%20Tunneling%20Protocol%20(PPTP)%20is%20a,%2FIP%2Dbased%20data%20networks.
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*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|C|R|K|S|s|Recur|A| Flags | Ver | Protocol Type |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Key (HW) Payload Length | Key (LW) Call ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Sequence Number (Optional) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Acknowledgment Number (Optional) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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struct pptp_gre_header
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{
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uint16_t checksum:1; /* Checksum Bit: Checksum field Present */
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uint16_t routing:1; /* Routing Bit: Routing field Present */
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uint16_t key:1; /* Key Bit: Key field Present */
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uint16_t sequence:1; /* Sequence Bit: sequence present. Set to one (1) if a payload (data) packet is present. Set to zero (0) if payload is not present (GRE packet is an Acknowledgment only) */
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uint16_t strict:1; /* Strict Bit: Strict source route present*/
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uint16_t recursion:3; /* Recursion Bit: Recursion control */
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uint16_t acknowledgment:1; /* Acknowledgment Bit: Acknowledgment sequence number present */
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uint16_t flags:4; /* Must be set to zero */
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uint16_t version:3; /* Must contain 1 (enhanced GRE) */
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};
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struct layer_addr_pptp
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{
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uint16_t pac_call_id; /* callid, network order */
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uint16_t pns_call_id; /* callid, network order */
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};
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/*
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* https://en.wikipedia.org/wiki/Layer_2_Tunneling_Protocol
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* The two endpoints of an L2TP tunnel are called the L2TP access concentrator (LAC) and the L2TP network server (LNS).
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* https://docs.huihoo.com/doxygen/linux/kernel/3.7/l2tp__core_8c_source.html
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* Do receive processing of L2TP data frames. We handle both L2TPv2
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* and L2TPv3 data frames here.
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*
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* L2TPv2 Data Message Header
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |T|L|x|x|S|x|O|P|x|x|x|x| Ver | Length (opt) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Tunnel ID | Session ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Ns (opt) | Nr (opt) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Offset Size (opt) | Offset pad... (opt)
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Data frames are marked by T=0. All other fields are the same as
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* those in L2TP control frames.
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*
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* L2TPv3 Data Message Header
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*
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | L2TP Session Header |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | L2-Specific Sublayer |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Tunnel Payload ...
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* L2TPv3 Session Header Over IP
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Session ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Cookie (optional, maximum 64 bits)...
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* L2TPv3 L2-Specific Sublayer Format
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*
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* 0 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |x|S|x|x|x|x|x|x| Sequence Number |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Cookie value, sublayer format and offset (pad) are negotiated with
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* the peer when the session is set up. Unlike L2TPv2, we do not need
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* to parse the packet header to determine if optional fields are
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* present.
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*
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* Caller must already have parsed the frame and determined that it is
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* a data (not control) frame before coming here. Fields up to the
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* session-id have already been parsed and ptr points to the data
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* after the session-id.
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*/
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struct layer_ppp_header
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{
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uint8_t address;
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uint8_t control;
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uint16_t protocol; /* network order */
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};
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struct layer_ppp_compress_header
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{
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uint8_t protocol;
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};
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struct layer_addr_l2tp_v2
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{
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uint16_t lac_tunnelid; /* network order */
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uint16_t lns_tunnelid; /* network order */
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uint16_t lac_sessionid; /* network order */
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uint16_t lns_sessionid; /* network order */
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uint8_t ppp_compress_hdr_enable;
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union
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{
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struct layer_ppp_header ppp_hdr;
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struct layer_ppp_compress_header ppp_compress_hdr;
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};
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};
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struct layer_addr_l2tp_v3
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{
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uint32_t sessionlid; /* network order */
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};
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struct l2tp_packet_type
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{
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uint16_t type:1; /* */
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uint16_t length:1; /* Lenght Bit: length field is not present */
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uint16_t padding1:2;
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uint16_t sequence:1; /* Sequence Bit: sequence(ns and nr) field is not present */
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uint16_t padding2:1;
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uint16_t offset:1; /* Offset Bit: Offset size filed is present */
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uint16_t priority:1; /* Priority Bit */
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uint16_t padding:4;
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uint16_t version:4;
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};
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struct layer_addr_l2tp
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{
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struct l2tp_packet_type l2tp_packet;
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union
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{
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struct layer_addr_l2tp_v2 v2;
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struct layer_addr_l2tp_v3 v3;
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};
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};
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struct layer_addr_gtp
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{
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uint32_t c2s_teid; /* network order */
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uint32_t s2c_teid; /* network order */
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};
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#define VLAN_ID_MASK (0x0FFF)
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#define VLAN_TAG_LEN (4)
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#define MAX_VLAN_ADDR_LAYER (8)
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/* refer to https://en.wikipedia.org/wiki/IEEE_802.1Q */
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struct layer_addr_single_vlan
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{
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uint8_t PCP; /* Priority code point */
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uint8_t DEI; /* Drop eligible indicator */
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uint16_t TPID; /* Tag protocol identifier, network order */
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uint16_t VID; /* VLAN identifier, network order */
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};
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struct layer_addr_vlan
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{
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uint8_t c2s_layer_num;
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uint8_t s2c_layer_num;
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struct layer_addr_single_vlan c2s_addr_array[MAX_VLAN_ADDR_LAYER];
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struct layer_addr_single_vlan s2c_addr_array[MAX_VLAN_ADDR_LAYER];
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};
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#define MAX_MPLS_ADDR_LAYER 4
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/* refer to RFC3032 */
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struct layer_addr_single_mpls
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{
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uint32_t label; /* network order */
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uint8_t experimental;
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uint8_t bottom;
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uint8_t ttl;
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};
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struct layer_addr_mpls
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{
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struct layer_addr_single_mpls c2s_addr_array[MAX_MPLS_ADDR_LAYER];
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struct layer_addr_single_mpls s2c_addr_array[MAX_MPLS_ADDR_LAYER];
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uint8_t c2s_layer_num; /* mpls layer number */
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uint8_t s2c_layer_num; /* mpls layer number */
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uint8_t c2s_ctrl_word_flag;
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uint8_t s2c_ctrl_word_flag;
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uint32_t c2s_ctrl_word; /* refer to RFC4623 */
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uint32_t s2c_ctrl_word; /* refer to RFC4623 */
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};
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#if 0
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https://en.wikipedia.org/wiki/Generic_Routing_Encapsulation
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struct layer_addr_gre
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{
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uint16_t call_id; /* network order */
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};
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#endif
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struct layer_addr_pppoe
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{
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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uint32_t ver:4;
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uint32_t type:4;
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#elif __BYTE_ORDER == __BIG_ENDIAN
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uint32_t type:4;
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uint32_t ver:4;
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#endif
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uint8_t code;
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uint16_t session_id;
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};
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struct raw_ipfrag_list
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{
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void *packet_frag; /* not ip header, the original header obtained from the underlying network card */
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uint32_t packet_len;
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int32_t packet_type; /* IPv4 or IPv6 */
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struct raw_ipfrag_list *next;
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};
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#ifdef __cpluscplus
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}
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#endif
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#endif
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