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17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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22 /* \summary: Compressed Serial Line Internet Protocol printer */
28 #include "netdissect-stdinc.h"
30 #define ND_LONGJMP_FROM_TCHECK
31 #include "netdissect.h"
36 #include "slcompress.h"
39 * definitions of the pseudo- link-level header attached to slip
40 * packets grabbed by the packet filter (bpf) traffic monitor.
42 #define SLIP_HDRLEN 16
51 static u_int lastlen[2][256];
52 static u_int lastconn = 255;
54 static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int);
55 static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
58 sl_if_print(netdissect_options *ndo,
59 const struct pcap_pkthdr *h, const u_char *p)
61 u_int length = h->len;
64 ndo->ndo_protocol = "slip";
65 ND_TCHECK_LEN(p, SLIP_HDRLEN);
66 ndo->ndo_ll_hdr_len += SLIP_HDRLEN;
68 length -= SLIP_HDRLEN;
70 ip = (const struct ip *)(p + SLIP_HDRLEN);
73 sliplink_print(ndo, p, ip, length);
77 ip_print(ndo, (const u_char *)ip, length);
80 ip6_print(ndo, (const u_char *)ip, length);
83 ND_PRINT("ip v%u", IP_V(ip));
88 sl_bsdos_if_print(netdissect_options *ndo,
89 const struct pcap_pkthdr *h, const u_char *p)
91 u_int length = h->len;
94 ndo->ndo_protocol = "slip_bsdos";
95 ND_TCHECK_LEN(p, SLIP_HDRLEN);
96 ndo->ndo_ll_hdr_len += SLIP_HDRLEN;
98 length -= SLIP_HDRLEN;
100 ip = (const struct ip *)(p + SLIP_HDRLEN);
104 sliplink_print(ndo, p, ip, length);
107 ip_print(ndo, (const u_char *)ip, length);
111 sliplink_print(netdissect_options *ndo,
112 const u_char *p, const struct ip *ip,
118 dir = GET_U_1(p + SLX_DIR);
130 ND_PRINT("Invalid direction %d ", dir);
134 switch (GET_U_1(p + SLX_CHDR) & 0xf0) {
137 ND_PRINT("ip %u: ", length + SLIP_HDRLEN);
140 case TYPE_UNCOMPRESSED_TCP:
142 * The connection id is stored in the IP protocol field.
143 * Get it from the link layer since sl_uncompress_tcp()
144 * has restored the IP header copy to IPPROTO_TCP.
146 lastconn = GET_U_1(((const struct ip *)(p + SLX_CHDR))->ip_p);
147 ND_PRINT("utcp %u: ", lastconn);
149 /* Direction is bogus, don't use it */
154 ND_TCHECK_SIZE((const struct tcphdr *)&((const int *)ip)[hlen]);
155 hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]);
156 lastlen[dir][lastconn] = length - (hlen << 2);
161 /* Direction is bogus, don't use it */
164 if (GET_U_1(p + SLX_CHDR) & TYPE_COMPRESSED_TCP) {
165 compressed_sl_print(ndo, p + SLX_CHDR, ip, length, dir);
168 ND_PRINT("slip-%u!: ", GET_U_1(p + SLX_CHDR));
172 static const u_char *
173 print_sl_change(netdissect_options *ndo,
174 const char *str, const u_char *cp)
178 if ((i = GET_U_1(cp)) == 0) {
183 ND_PRINT(" %s%u", str, i);
187 static const u_char *
188 print_sl_winchange(netdissect_options *ndo,
193 if ((i = GET_U_1(cp)) == 0) {
199 ND_PRINT(" W+%d", i);
206 compressed_sl_print(netdissect_options *ndo,
207 const u_char *chdr, const struct ip *ip,
208 u_int length, int dir)
210 const u_char *cp = chdr;
216 lastconn = GET_U_1(cp);
218 ND_PRINT("ctcp %u", lastconn);
222 /* skip tcp checksum */
225 switch (flags & SPECIALS_MASK) {
227 ND_PRINT(" *SA+%u", lastlen[dir][lastconn]);
231 ND_PRINT(" *S+%u", lastlen[dir][lastconn]);
236 cp = print_sl_change(ndo, "U=", cp);
238 cp = print_sl_winchange(ndo, cp);
240 cp = print_sl_change(ndo, "A+", cp);
242 cp = print_sl_change(ndo, "S+", cp);
246 cp = print_sl_change(ndo, "I+", cp);
249 * 'hlen' is the length of the uncompressed TCP/IP header (in words).
250 * 'cp - chdr' is the length of the compressed header.
251 * 'length - hlen' is the amount of data in the packet.
255 ND_TCHECK_SIZE((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
256 hlen += TH_OFF((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
257 lastlen[dir][lastconn] = length - (hlen << 2);
258 ND_PRINT(" %u (%ld)", lastlen[dir][lastconn], (long)(cp - chdr));