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22 /* \summary: Compressed Serial Line Internet Protocol printer */
28 #include <netdissect-stdinc.h>
30 #include "netdissect.h"
35 #include "slcompress.h"
38 * definitions of the pseudo- link-level header attached to slip
39 * packets grabbed by the packet filter (bpf) traffic monitor.
41 #define SLIP_HDRLEN 16
50 static const char tstr[] = "[|slip]";
52 static u_int lastlen[2][256];
53 static u_int lastconn = 255;
55 static void sliplink_print(netdissect_options *, const u_char *, const struct ip *, u_int);
56 static void compressed_sl_print(netdissect_options *, const u_char *, const struct ip *, u_int, int);
59 sl_if_print(netdissect_options *ndo,
60 const struct pcap_pkthdr *h, const u_char *p)
62 register u_int caplen = h->caplen;
63 register u_int length = h->len;
64 register const struct ip *ip;
66 if (caplen < SLIP_HDRLEN || length < SLIP_HDRLEN) {
67 ND_PRINT((ndo, "%s", tstr));
71 caplen -= SLIP_HDRLEN;
72 length -= SLIP_HDRLEN;
74 ip = (const struct ip *)(p + SLIP_HDRLEN);
77 sliplink_print(ndo, p, ip, length);
79 if (caplen < 1 || length < 1) {
80 ND_PRINT((ndo, "%s", tstr));
81 return (caplen + SLIP_HDRLEN);
86 ip_print(ndo, (const u_char *)ip, length);
89 ip6_print(ndo, (const u_char *)ip, length);
92 ND_PRINT((ndo, "ip v%d", IP_V(ip)));
99 sl_bsdos_if_print(netdissect_options *ndo,
100 const struct pcap_pkthdr *h, const u_char *p)
102 register u_int caplen = h->caplen;
103 register u_int length = h->len;
104 register const struct ip *ip;
106 if (caplen < SLIP_HDRLEN) {
107 ND_PRINT((ndo, "%s", tstr));
111 length -= SLIP_HDRLEN;
113 ip = (const struct ip *)(p + SLIP_HDRLEN);
117 sliplink_print(ndo, p, ip, length);
120 ip_print(ndo, (const u_char *)ip, length);
122 return (SLIP_HDRLEN);
126 sliplink_print(netdissect_options *ndo,
127 register const u_char *p, register const struct ip *ip,
128 register u_int length)
134 ND_PRINT((ndo, dir == SLIPDIR_IN ? "I " : "O "));
136 if (ndo->ndo_nflag) {
137 /* XXX just dump the header */
140 for (i = SLX_CHDR; i < SLX_CHDR + CHDR_LEN - 1; ++i)
141 ND_PRINT((ndo, "%02x.", p[i]));
142 ND_PRINT((ndo, "%02x: ", p[SLX_CHDR + CHDR_LEN - 1]));
145 switch (p[SLX_CHDR] & 0xf0) {
148 ND_PRINT((ndo, "ip %d: ", length + SLIP_HDRLEN));
151 case TYPE_UNCOMPRESSED_TCP:
153 * The connection id is stored in the IP protocol field.
154 * Get it from the link layer since sl_uncompress_tcp()
155 * has restored the IP header copy to IPPROTO_TCP.
157 lastconn = ((const struct ip *)&p[SLX_CHDR])->ip_p;
159 hlen += TH_OFF((const struct tcphdr *)&((const int *)ip)[hlen]);
160 lastlen[dir][lastconn] = length - (hlen << 2);
161 ND_PRINT((ndo, "utcp %d: ", lastconn));
165 if (p[SLX_CHDR] & TYPE_COMPRESSED_TCP) {
166 compressed_sl_print(ndo, &p[SLX_CHDR], ip,
168 ND_PRINT((ndo, ": "));
170 ND_PRINT((ndo, "slip-%d!: ", p[SLX_CHDR]));
174 static const u_char *
175 print_sl_change(netdissect_options *ndo,
176 const char *str, register const u_char *cp)
180 if ((i = *cp++) == 0) {
181 i = EXTRACT_16BITS(cp);
184 ND_PRINT((ndo, " %s%d", str, i));
188 static const u_char *
189 print_sl_winchange(netdissect_options *ndo,
190 register const u_char *cp)
194 if ((i = *cp++) == 0) {
195 i = EXTRACT_16BITS(cp);
199 ND_PRINT((ndo, " W+%d", i));
201 ND_PRINT((ndo, " 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 register const u_char *cp = chdr;
211 register u_int flags, hlen;
216 ND_PRINT((ndo, "ctcp %d", lastconn));
218 ND_PRINT((ndo, "ctcp *"));
220 /* skip tcp checksum */
223 switch (flags & SPECIALS_MASK) {
225 ND_PRINT((ndo, " *SA+%d", lastlen[dir][lastconn]));
229 ND_PRINT((ndo, " *S+%d", lastlen[dir][lastconn]));
234 cp = print_sl_change(ndo, "U=", cp);
236 cp = print_sl_winchange(ndo, cp);
238 cp = print_sl_change(ndo, "A+", cp);
240 cp = print_sl_change(ndo, "S+", cp);
244 cp = print_sl_change(ndo, "I+", cp);
247 * 'hlen' is the length of the uncompressed TCP/IP header (in words).
248 * 'cp - chdr' is the length of the compressed header.
249 * 'length - hlen' is the amount of data in the packet.
252 hlen += TH_OFF((const struct tcphdr *)&((const int32_t *)ip)[hlen]);
253 lastlen[dir][lastconn] = length - (hlen << 2);
254 ND_PRINT((ndo, " %d (%ld)", lastlen[dir][lastconn], (long)(cp - chdr)));