1 /* $OpenBSD: print-ether.c,v 1.31 2016/07/11 00:27:50 rzalamena Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 */ 23 24 #include <sys/time.h> 25 #include <sys/socket.h> 26 27 struct mbuf; 28 struct rtentry; 29 #include <net/if.h> 30 31 #include <netinet/in.h> 32 #include <netinet/if_ether.h> 33 #include <netinet/ip.h> 34 #include <netinet/ip_var.h> 35 #include <netinet/udp.h> 36 #include <netinet/udp_var.h> 37 #include <netinet/tcp.h> 38 39 #include <stdio.h> 40 #include <pcap.h> 41 42 #ifdef INET6 43 #include <netinet/ip6.h> 44 #endif 45 46 #include "interface.h" 47 #include "addrtoname.h" 48 #include "ethertype.h" 49 #include "extract.h" 50 51 const u_char *packetp; 52 const u_char *snapend; 53 54 void ether_macctl(const u_char *, u_int); 55 56 void 57 ether_print(const u_char *bp, u_int length) 58 { 59 const struct ether_header *ep; 60 61 ep = (const struct ether_header *)bp; 62 if (qflag) { 63 TCHECK2(*ep, 12); 64 (void)printf("%s %s %d: ", 65 etheraddr_string(ESRC(ep)), 66 etheraddr_string(EDST(ep)), 67 length); 68 } else { 69 TCHECK2(*ep, 14); 70 (void)printf("%s %s %s %d: ", 71 etheraddr_string(ESRC(ep)), 72 etheraddr_string(EDST(ep)), 73 etherproto_string(ep->ether_type), 74 length); 75 } 76 return; 77 trunc: 78 printf("[|ether] "); 79 } 80 81 u_short extracted_ethertype; 82 83 /* 84 * This is the top level routine of the printer. 'p' is the points 85 * to the ether header of the packet, 'tvp' is the timestamp, 86 * 'length' is the length of the packet off the wire, and 'caplen' 87 * is the number of bytes actually captured. 88 */ 89 void 90 ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 91 { 92 ts_print(&h->ts); 93 94 /* 95 * Some printers want to get back at the ethernet addresses, 96 * and/or check that they're not walking off the end of the packet. 97 * Rather than pass them all the way down, we set these globals. 98 */ 99 snapend = p + h->caplen; 100 101 ether_tryprint(p, h->len, 1); 102 } 103 104 void 105 ether_tryprint(const u_char *p, u_int length, int first_header) 106 { 107 struct ether_header *ep; 108 u_int caplen = snapend - p; 109 u_short ether_type; 110 111 if (caplen < sizeof(struct ether_header)) { 112 printf("[|ether]"); 113 goto out; 114 } 115 116 if (eflag) 117 ether_print(p, length); 118 119 packetp = p; 120 length -= sizeof(struct ether_header); 121 caplen -= sizeof(struct ether_header); 122 ep = (struct ether_header *)p; 123 p += sizeof(struct ether_header); 124 125 ether_type = ntohs(ep->ether_type); 126 127 /* 128 * Is it (gag) an 802.3 encapsulation? 129 */ 130 extracted_ethertype = 0; 131 if (ether_type <= ETHERMTU) { 132 /* Try to print the LLC-layer header & higher layers */ 133 if (llc_print(p, length, caplen, ESRC(ep), EDST(ep)) == 0) { 134 /* ether_type not known, print raw packet */ 135 if (!eflag) 136 ether_print((u_char *)ep, length); 137 if (extracted_ethertype) { 138 printf("(LLC %s) ", 139 etherproto_string(htons(extracted_ethertype))); 140 } 141 if (!xflag && !qflag) { 142 if (eflag) 143 default_print(packetp, 144 snapend - packetp); 145 else 146 default_print(p, caplen); 147 } 148 } 149 } else if (ether_encap_print(ether_type, p, length, caplen) == 0) { 150 /* ether_type not known, print raw packet */ 151 if (!eflag) 152 ether_print((u_char *)ep, length + sizeof(*ep)); 153 if (!xflag && !qflag) { 154 if (eflag) 155 default_print(packetp, snapend - packetp); 156 else 157 default_print(p, caplen); 158 } 159 } 160 if (xflag && first_header) { 161 if (eflag) 162 default_print(packetp, snapend - packetp); 163 else 164 default_print(p, caplen); 165 } 166 out: 167 if (first_header) 168 putchar('\n'); 169 } 170 171 /* 172 * Prints the packet encapsulated in an Ethernet data segment 173 * (or an equivalent encapsulation), given the Ethernet type code. 174 * 175 * Returns non-zero if it can do so, zero if the ethertype is unknown. 176 * 177 * Stuffs the ether type into a global for the benefit of lower layers 178 * that might want to know what it is. 179 */ 180 181 int 182 ether_encap_print(u_short ethertype, const u_char *p, 183 u_int length, u_int caplen) 184 { 185 recurse: 186 extracted_ethertype = ethertype; 187 188 switch (ethertype) { 189 190 case ETHERTYPE_IP: 191 ip_print(p, length); 192 return (1); 193 194 #ifdef INET6 195 case ETHERTYPE_IPV6: 196 ip6_print(p, length); 197 return (1); 198 #endif /*INET6*/ 199 200 case ETHERTYPE_ARP: 201 case ETHERTYPE_REVARP: 202 arp_print(p, length, caplen); 203 return (1); 204 205 case ETHERTYPE_DN: 206 decnet_print(p, length, caplen); 207 return (1); 208 209 case ETHERTYPE_ATALK: 210 if (vflag) 211 fputs("et1 ", stdout); 212 atalk_print_llap(p, length); 213 return (1); 214 215 case ETHERTYPE_AARP: 216 aarp_print(p, length); 217 return (1); 218 219 case ETHERTYPE_8021Q: 220 printf("802.1Q "); 221 case ETHERTYPE_QINQ: 222 if (ethertype == ETHERTYPE_QINQ) 223 printf("QinQ s"); 224 printf("vid %d pri %d%s", 225 ntohs(*(unsigned short*)p)&0xFFF, 226 ntohs(*(unsigned short*)p)>>13, 227 (ntohs(*(unsigned short*)p)&0x1000) ? " cfi " : " "); 228 ethertype = ntohs(*(unsigned short*)(p+2)); 229 p += 4; 230 length -= 4; 231 caplen -= 4; 232 if (ethertype > ETHERMTU) 233 goto recurse; 234 235 extracted_ethertype = 0; 236 237 if (llc_print(p, length, caplen, p-18, p-12) == 0) { 238 /* ether_type not known, print raw packet */ 239 if (!eflag) 240 ether_print(p-18, length+4); 241 if (extracted_ethertype) { 242 printf("(LLC %s) ", 243 etherproto_string(htons(extracted_ethertype))); 244 } 245 if (!xflag && !qflag) 246 default_print(p-18, caplen+4); 247 } 248 return (1); 249 250 #ifdef PPP 251 case ETHERTYPE_PPPOEDISC: 252 case ETHERTYPE_PPPOE: 253 pppoe_if_print(ethertype, p, length, caplen); 254 return (1); 255 #endif 256 257 case ETHERTYPE_FLOWCONTROL: 258 ether_macctl(p, length); 259 return (1); 260 261 case ETHERTYPE_MPLS: 262 case ETHERTYPE_MPLS_MCAST: 263 mpls_print(p, length); 264 return (1); 265 266 case ETHERTYPE_LLDP: 267 lldp_print(p, length); 268 return (1); 269 270 case ETHERTYPE_SLOW: 271 slow_print(p, length); 272 return (1); 273 274 case ETHERTYPE_LAT: 275 case ETHERTYPE_SCA: 276 case ETHERTYPE_MOPRC: 277 case ETHERTYPE_MOPDL: 278 /* default_print for now */ 279 default: 280 return (0); 281 } 282 } 283 284 void 285 ether_macctl(const u_char *p, u_int length) 286 { 287 printf("MACCTL"); 288 289 if (length < 2) 290 goto trunc; 291 if (EXTRACT_16BITS(p) == 0x0001) { 292 u_int plen; 293 294 printf(" PAUSE"); 295 296 length -= 2; 297 p += 2; 298 if (length < 2) 299 goto trunc; 300 plen = 512 * EXTRACT_16BITS(p); 301 printf(" quanta %u", plen); 302 } else { 303 printf(" unknown-opcode(0x%04x)", EXTRACT_16BITS(p)); 304 } 305 return; 306 307 trunc: 308 printf("[|MACCTL]"); 309 } 310