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12 * ``This product includes software developed by the University of California,
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17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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22 static const char rcsid[] _U_ =
23 "@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.19 2005-11-13 12:12:43 guy Exp $ (LBL)";
30 #include <tcpdump-stdinc.h>
36 #include "interface.h"
37 #include "addrtoname.h"
38 #include "ethertype.h"
44 const struct tok sll_pkttype_values[] = {
45 { LINUX_SLL_HOST, "In" },
46 { LINUX_SLL_BROADCAST, "B" },
47 { LINUX_SLL_MULTICAST, "M" },
48 { LINUX_SLL_OTHERHOST, "P" },
49 { LINUX_SLL_OUTGOING, "Out" },
54 sll_print(register const struct sll_header *sllp, u_int length)
58 printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype)));
61 * XXX - check the link-layer address type value?
62 * For now, we just assume 6 means Ethernet.
63 * XXX - print others as strings of hex?
65 if (EXTRACT_16BITS(&sllp->sll_halen) == 6)
66 (void)printf("%s ", etheraddr_string(sllp->sll_addr));
69 ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
71 if (ether_type <= ETHERMTU) {
73 * Not an Ethernet type; what type is it?
77 case LINUX_SLL_P_802_3:
79 * Ethernet_802.3 IPX frame.
81 (void)printf("802.3");
84 case LINUX_SLL_P_802_2:
88 (void)printf("802.2");
95 (void)printf("ethertype Unknown (0x%04x)",
100 (void)printf("ethertype %s (0x%04x)",
101 tok2str(ethertype_values, "Unknown", ether_type),
104 (void)printf(", length %u: ", length);
109 * This is the top level routine of the printer. 'p' points to the
110 * Linux "cooked capture" header of the packet, 'h->ts' is the timestamp,
111 * 'h->len' is the length of the packet off the wire, and 'h->caplen'
112 * is the number of bytes actually captured.
115 sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
117 u_int caplen = h->caplen;
118 u_int length = h->len;
119 register const struct sll_header *sllp;
121 u_short extracted_ethertype;
123 if (caplen < SLL_HDR_LEN) {
125 * XXX - this "can't happen" because "pcap-linux.c" always
126 * adds this many bytes of header to every packet in a
127 * cooked socket capture.
133 sllp = (const struct sll_header *)p;
136 sll_print(sllp, length);
139 * Go past the cooked-mode header.
141 length -= SLL_HDR_LEN;
142 caplen -= SLL_HDR_LEN;
145 ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
149 * Is it (gag) an 802.3 encapsulation, or some non-Ethernet
152 if (ether_type <= ETHERMTU) {
154 * Yes - what type is it?
156 switch (ether_type) {
158 case LINUX_SLL_P_802_3:
160 * Ethernet_802.3 IPX frame.
162 ipx_print(p, length);
165 case LINUX_SLL_P_802_2:
168 * Try to print the LLC-layer header & higher layers.
170 if (llc_print(p, length, caplen, NULL, NULL,
171 &extracted_ethertype) == 0)
172 goto unknown; /* unknown LLC type */
176 extracted_ethertype = 0;
180 /* ether_type not known, print raw packet */
182 sll_print(sllp, length + SLL_HDR_LEN);
183 if (extracted_ethertype) {
185 etherproto_string(htons(extracted_ethertype)));
187 if (!suppress_default_print)
188 default_print(p, caplen);
191 } else if (ether_type == ETHERTYPE_8021Q) {
193 * Print VLAN information, and then go back and process
194 * the enclosed type field.
196 if (caplen < 4 || length < 4) {
198 return (SLL_HDR_LEN);
201 u_int16_t tag = EXTRACT_16BITS(p);
203 printf("vlan %u, p %u%s, ",
206 (tag & 0x1000) ? ", CFI" : "");
209 ether_type = EXTRACT_16BITS(p + 2);
210 if (ether_type <= ETHERMTU)
211 ether_type = LINUX_SLL_P_802_2;
213 (void)printf("ethertype %s, ",
214 tok2str(ethertype_values, "Unknown", ether_type));
221 if (ethertype_print(ether_type, p, length, caplen) == 0) {
222 /* ether_type not known, print raw packet */
224 sll_print(sllp, length + SLL_HDR_LEN);
225 if (!suppress_default_print)
226 default_print(p, caplen);
230 return (SLL_HDR_LEN);