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12 * ``This product includes software developed by the University of California,
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24 #define NETDISSECT_REWORKED
29 #include <tcpdump-stdinc.h>
31 #include "interface.h"
32 #include "extract.h" /* must come after interface.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 const char tstr[] = "[|slip]";
53 static u_int lastlen[2][256];
54 static u_int lastconn = 255;
56 static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int);
57 static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
60 sl_if_print(netdissect_options *ndo,
61 const struct pcap_pkthdr *h, const u_char *p)
63 register u_int caplen = h->caplen;
64 register u_int length = h->len;
65 register const struct ip *ip;
67 if (caplen < SLIP_HDRLEN || length < SLIP_HDRLEN) {
68 ND_PRINT((ndo, "%s", tstr));
72 length -= SLIP_HDRLEN;
74 ip = (struct ip *)(p + SLIP_HDRLEN);
77 sliplink_print(ndo, p, ip, length);
81 ip_print(ndo, (u_char *)ip, length);
85 ip6_print(ndo, (u_char *)ip, length);
89 ND_PRINT((ndo, "ip v%d", IP_V(ip)));
96 sl_bsdos_if_print(netdissect_options *ndo,
97 const struct pcap_pkthdr *h, const u_char *p)
99 register u_int caplen = h->caplen;
100 register u_int length = h->len;
101 register const struct ip *ip;
103 if (caplen < SLIP_HDRLEN) {
104 ND_PRINT((ndo, "%s", tstr));
108 length -= SLIP_HDRLEN;
110 ip = (struct ip *)(p + SLIP_HDRLEN);
114 sliplink_print(ndo, p, ip, length);
117 ip_print(ndo, (u_char *)ip, length);
119 return (SLIP_HDRLEN);
123 sliplink_print(netdissect_options *ndo,
124 register const u_char *p, register const struct ip *ip,
125 register u_int length)
131 ND_PRINT((ndo, dir == SLIPDIR_IN ? "I " : "O "));
133 if (ndo->ndo_nflag) {
134 /* XXX just dump the header */
137 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
138 ND_PRINT((ndo, "%02x.", p[i]));
139 ND_PRINT((ndo, "%02x: ", p[SLX_CHDR + CHDR_LEN - 1]));
142 switch (p[SLX_CHDR] & 0xf0) {
145 ND_PRINT((ndo, "ip %d: ", length + SLIP_HDRLEN));
148 case TYPE_UNCOMPRESSED_TCP:
150 * The connection id is stored in the IP protocol field.
151 * Get it from the link layer since sl_uncompress_tcp()
152 * has restored the IP header copy to IPPROTO_TCP.
154 lastconn = ((struct ip *)&p[SLX_CHDR])->ip_p;
156 hlen += TH_OFF((struct tcphdr *)&((int *)ip)[hlen]);
157 lastlen[dir][lastconn] = length - (hlen << 2);
158 ND_PRINT((ndo, "utcp %d: ", lastconn));
162 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
163 compressed_sl_print(ndo, &p[SLX_CHDR], ip,
165 ND_PRINT((ndo, ": "));
167 ND_PRINT((ndo, "slip-%d!: ", p[SLX_CHDR]));
171 static const u_char *
172 print_sl_change(netdissect_options *ndo,
173 const char *str, register const u_char *cp)
177 if ((i = *cp++) == 0) {
178 i = EXTRACT_16BITS(cp);
181 ND_PRINT((ndo, " %s%d", str, i));
185 static const u_char *
186 print_sl_winchange(netdissect_options *ndo,
187 register const u_char *cp)
191 if ((i = *cp++) == 0) {
192 i = EXTRACT_16BITS(cp);
196 ND_PRINT((ndo, " W+%d", i));
198 ND_PRINT((ndo, " W%d", i));
203 compressed_sl_print(netdissect_options *ndo,
204 const u_char *chdr, const struct ip *ip,
205 u_int length, int dir)
207 register const u_char *cp = chdr;
208 register u_int flags, hlen;
213 ND_PRINT((ndo, "ctcp %d", lastconn));
215 ND_PRINT((ndo, "ctcp *"));
217 /* skip tcp checksum */
220 switch (flags & SPECIALS_MASK) {
222 ND_PRINT((ndo, " *SA+%d", lastlen[dir][lastconn]));
226 ND_PRINT((ndo, " *S+%d", lastlen[dir][lastconn]));
231 cp = print_sl_change(ndo, "U=", cp);
233 cp = print_sl_winchange(ndo, cp);
235 cp = print_sl_change(ndo, "A+", cp);
237 cp = print_sl_change(ndo, "S+", cp);
241 cp = print_sl_change(ndo, "I+", cp);
244 * 'hlen' is the length of the uncompressed TCP/IP header (in words).
245 * 'cp - chdr' is the length of the compressed header.
246 * 'length - hlen' is the amount of data in the packet.
249 hlen += TH_OFF((struct tcphdr *)&((int32_t *)ip)[hlen]);
250 lastlen[dir][lastconn] = length - (hlen << 2);
251 ND_PRINT((ndo, " %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)));