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The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. * * Van Jacobson (van@helios.ee.lbl.gov), Dec 31, 1989: * - Initial distribution. * * * modified for KA9Q Internet Software Package by * Katie Stevens (dkstevens@ucdavis.edu) * University of California, Davis * Computing Services * - 01-31-90 initial adaptation * * - Feb 1991 Bill_Simpson@um.cc.umich.edu * variable number of conversation slots * allow zero or one slots * separate routines * status display */ /* * Compressed packet format: * * The first octet contains the packet type (top 3 bits), TCP * 'push' bit, and flags that indicate which of the 4 TCP sequence * numbers have changed (bottom 5 bits). The next octet is a * conversation number that associates a saved IP/TCP header with * the compressed packet. The next two octets are the TCP checksum * from the original datagram. The next 0 to 15 octets are * sequence number changes, one change per bit set in the header * (there may be no changes and there are two special cases where * the receiver implicitly knows what changed -- see below). * * There are 5 numbers which can change (they are always inserted * in the following order): TCP urgent pointer, window, * acknowledgment, sequence number and IP ID. (The urgent pointer * is different from the others in that its value is sent, not the * change in value.) Since typical use of SLIP links is biased * toward small packets (see comments on MTU/MSS below), changes * use a variable length coding with one octet for numbers in the * range 1 - 255 and 3 octets (0, MSB, LSB) for numbers in the * range 256 - 65535 or 0. (If the change in sequence number or * ack is more than 65535, an uncompressed packet is sent.) */ /* * Packet types (must not conflict with IP protocol version) * * The top nibble of the first octet is the packet type. There are * three possible types: IP (not proto TCP or tcp with one of the * control flags set); uncompressed TCP (a normal IP/TCP packet but * with the 8-bit protocol field replaced by an 8-bit connection id -- * this type of packet syncs the sender & receiver); and compressed * TCP (described above). * * LSB of 4-bit field is TCP "PUSH" bit (a worthless anachronism) and * is logically part of the 4-bit "changes" field that follows. Top * three bits are actual packet type. For backward compatibility * and in the interest of conserving bits, numbers are chosen so the * IP protocol version number (4) which normally appears in this nibble * means "IP packet". */ #include #include /* SLIP compression masks for len/vers byte */ #define SL_TYPE_IP 0x40 #define SL_TYPE_UNCOMPRESSED_TCP 0x70 #define SL_TYPE_COMPRESSED_TCP 0x80 #define SL_TYPE_ERROR 0x00 /* Bits in first octet of compressed packet */ #define NEW_C 0x40 /* flag bits for what changed in a packet */ #define NEW_I 0x20 #define NEW_S 0x08 #define NEW_A 0x04 #define NEW_W 0x02 #define NEW_U 0x01 /* reserved, special-case values of above */ #define SPECIAL_I (NEW_S|NEW_W|NEW_U) /* echoed interactive traffic */ #define SPECIAL_D (NEW_S|NEW_A|NEW_W|NEW_U) /* unidirectional data */ #define SPECIALS_MASK (NEW_S|NEW_A|NEW_W|NEW_U) #define TCP_PUSH_BIT 0x10 /* * data type and sizes conversion assumptions: * * VJ code KA9Q style generic * u_char byte_t unsigned char 8 bits * u_short int16 unsigned short 16 bits * u_int int16 unsigned short 16 bits * u_long unsigned long unsigned long 32 bits * int int32 long 32 bits */ typedef __u8 byte_t; typedef __u32 int32; /* * "state" data for each active tcp conversation on the wire. This is * basically a copy of the entire IP/TCP header from the last packet * we saw from the conversation together with a small identifier * the transmit & receive ends of the line use to locate saved header. */ struct cstate { byte_t cs_this; /* connection id number (xmit) */ bool initialized; /* true if initialized */ struct cstate *next; /* next in ring (xmit) */ struct iphdr cs_ip; /* ip/tcp hdr from most recent packet */ struct tcphdr cs_tcp; unsigned char cs_ipopt[64]; unsigned char cs_tcpopt[64]; int cs_hsize; }; #define NULLSLSTATE (struct cstate *)0 /* * all the state data for one serial line (we need one of these per line). */ struct slcompress { struct cstate *tstate; /* transmit connection states (array)*/ struct cstate *rstate; /* receive connection states (array)*/ byte_t tslot_limit; /* highest transmit slot id (0-l)*/ byte_t rslot_limit; /* highest receive slot id (0-l)*/ byte_t xmit_oldest; /* oldest xmit in ring */ byte_t xmit_current; /* most recent xmit id */ byte_t recv_current; /* most recent rcvd id */ byte_t flags; #define SLF_TOSS 0x01 /* tossing rcvd frames until id received */ int32 sls_o_nontcp; /* outbound non-TCP packets */ int32 sls_o_tcp; /* outbound TCP packets */ int32 sls_o_uncompressed; /* outbound uncompressed packets */ int32 sls_o_compressed; /* outbound compressed packets */ int32 sls_o_searches; /* searches for connection state */ int32 sls_o_misses; /* times couldn't find conn. state */ int32 sls_i_uncompressed; /* inbound uncompressed packets */ int32 sls_i_compressed; /* inbound compressed packets */ int32 sls_i_error; /* inbound error packets */ int32 sls_i_tossed; /* inbound packets tossed because of error */ int32 sls_i_runt; int32 sls_i_badcheck; }; #define NULLSLCOMPR (struct slcompress *)0 /* In slhc.c: */ struct slcompress *slhc_init(int rslots, int tslots); void slhc_free(struct slcompress *comp); int slhc_compress(struct slcompress *comp, unsigned char *icp, int isize, unsigned char *ocp, unsigned char **cpp, int compress_cid); int slhc_uncompress(struct slcompress *comp, unsigned char *icp, int isize); int slhc_remember(struct slcompress *comp, unsigned char *icp, int isize); int slhc_toss(struct slcompress *comp); #endif /* _SLHC_H */