Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_ether.h
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1 /* $NetBSD: if_ether.h,v 1.43.2.1 2009/03/31 18:02:32 bouyer Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1993 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 the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)if_ether.h 8.1 (Berkeley) 6/10/93 32 */ 33 34 #ifndef _NET_IF_ETHER_H_ 35 #define _NET_IF_ETHER_H_ 36 37 #ifdef _KERNEL 38 #ifdef _KERNEL_OPT 39 #include "opt_mbuftrace.h" 40 #endif 41 #include <sys/mbuf.h> 42 #endif 43 44 /* 45 * Some basic Ethernet constants. 46 */ 47 #define ETHER_ADDR_LEN 6 /* length of an Ethernet address */ 48 #define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */ 49 #define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */ 50 #define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN) 51 #define ETHER_MIN_LEN 64 /* minimum frame length, including CRC */ 52 #define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */ 53 #define ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */ 54 55 /* 56 * Some Ethernet extensions. 57 */ 58 #define ETHER_VLAN_ENCAP_LEN 4 /* length of 802.1Q VLAN encapsulation */ 59 #define ETHER_PPPOE_ENCAP_LEN 8 /* length of PPPoE encapsulation */ 60 61 /* 62 * Ethernet address - 6 octets 63 * this is only used by the ethers(3) functions. 64 */ 65 struct ether_addr { 66 u_int8_t ether_addr_octet[ETHER_ADDR_LEN]; 67 } __attribute__((__packed__)); 68 69 /* 70 * Structure of a 10Mb/s Ethernet header. 71 */ 72 struct ether_header { 73 u_int8_t ether_dhost[ETHER_ADDR_LEN]; 74 u_int8_t ether_shost[ETHER_ADDR_LEN]; 75 u_int16_t ether_type; 76 } __attribute__((__packed__)); 77 78 #include <net/ethertypes.h> 79 80 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 81 82 #define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN) 83 #define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 84 #define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 85 86 /* 87 * Compute the maximum frame size based on ethertype (i.e. possible 88 * encapsulation) and whether or not an FCS is present. 89 */ 90 #define ETHER_MAX_FRAME(ifp, etype, hasfcs) \ 91 ((ifp)->if_mtu + ETHER_HDR_LEN + \ 92 ((hasfcs) ? ETHER_CRC_LEN : 0) + \ 93 (((etype) == ETHERTYPE_VLAN) ? ETHER_VLAN_ENCAP_LEN : 0) + \ 94 (((etype) == ETHERTYPE_PPPOE) ? ETHER_PPPOE_ENCAP_LEN : 0)) 95 96 /* 97 * Ethernet CRC32 polynomials (big- and little-endian verions). 98 */ 99 #define ETHER_CRC_POLY_LE 0xedb88320 100 #define ETHER_CRC_POLY_BE 0x04c11db6 101 102 #ifndef _STANDALONE 103 104 /* 105 * Ethernet-specific mbuf flags. 106 */ 107 #define M_HASFCS M_LINK0 /* FCS included at end of frame */ 108 #define M_PROMISC M_LINK1 /* this packet is not for us */ 109 110 #ifdef _KERNEL 111 /* 112 * Macro to map an IP multicast address to an Ethernet multicast address. 113 * The high-order 25 bits of the Ethernet address are statically assigned, 114 * and the low-order 23 bits are taken from the low end of the IP address. 115 */ 116 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 117 /* struct in_addr *ipaddr; */ \ 118 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 119 { \ 120 (enaddr)[0] = 0x01; \ 121 (enaddr)[1] = 0x00; \ 122 (enaddr)[2] = 0x5e; \ 123 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \ 124 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \ 125 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \ 126 } 127 /* 128 * Macro to map an IP6 multicast address to an Ethernet multicast address. 129 * The high-order 16 bits of the Ethernet address are statically assigned, 130 * and the low-order 32 bits are taken from the low end of the IP6 address. 131 */ 132 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \ 133 /* struct in6_addr *ip6addr; */ \ 134 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \ 135 { \ 136 (enaddr)[0] = 0x33; \ 137 (enaddr)[1] = 0x33; \ 138 (enaddr)[2] = ((u_int8_t *)ip6addr)[12]; \ 139 (enaddr)[3] = ((u_int8_t *)ip6addr)[13]; \ 140 (enaddr)[4] = ((u_int8_t *)ip6addr)[14]; \ 141 (enaddr)[5] = ((u_int8_t *)ip6addr)[15]; \ 142 } 143 #endif 144 145 /* 146 * Structure shared between the ethernet driver modules and 147 * the multicast list code. For example, each ec_softc or il_softc 148 * begins with this structure. 149 */ 150 struct ethercom { 151 struct ifnet ec_if; /* network-visible interface */ 152 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast 153 addrs */ 154 int ec_multicnt; /* length of ec_multiaddrs 155 list */ 156 int ec_capabilities; /* capabilities, provided by 157 driver */ 158 int ec_capenable; /* tells hardware which 159 capabilities to enable */ 160 161 int ec_nvlans; /* # VLANs on this interface */ 162 #ifdef MBUFTRACE 163 struct mowner ec_rx_mowner; /* mbufs received */ 164 struct mowner ec_tx_mowner; /* mbufs transmitted */ 165 #endif 166 }; 167 168 #define ETHERCAP_VLAN_MTU 0x00000001 /* VLAN-compatible MTU */ 169 #define ETHERCAP_VLAN_HWTAGGING 0x00000002 /* hardware VLAN tag support */ 170 #define ETHERCAP_JUMBO_MTU 0x00000004 /* 9000 byte MTU supported */ 171 172 #ifdef _KERNEL 173 extern const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 174 extern const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN]; 175 extern const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 176 extern const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 177 178 int ether_ioctl(struct ifnet *, u_long, caddr_t); 179 int ether_addmulti (struct ifreq *, struct ethercom *); 180 int ether_delmulti (struct ifreq *, struct ethercom *); 181 int ether_changeaddr (struct ifreq *, struct ethercom *); 182 int ether_multiaddr(struct sockaddr *, u_int8_t[], u_int8_t[]); 183 #endif /* _KERNEL */ 184 185 /* 186 * Ethernet multicast address structure. There is one of these for each 187 * multicast address or range of multicast addresses that we are supposed 188 * to listen to on a particular interface. They are kept in a linked list, 189 * rooted in the interface's ethercom structure. 190 */ 191 struct ether_multi { 192 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 193 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 194 u_int enm_refcount; /* no. claims to this addr/range */ 195 LIST_ENTRY(ether_multi) enm_list; 196 }; 197 198 /* 199 * Structure used by macros below to remember position when stepping through 200 * all of the ether_multi records. 201 */ 202 struct ether_multistep { 203 struct ether_multi *e_enm; 204 }; 205 206 /* 207 * Macro for looking up the ether_multi record for a given range of Ethernet 208 * multicast addresses connected to a given ethercom structure. If no matching 209 * record is found, "enm" returns NULL. 210 */ 211 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \ 212 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \ 213 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \ 214 /* struct ethercom *ec; */ \ 215 /* struct ether_multi *enm; */ \ 216 { \ 217 for ((enm) = LIST_FIRST(&(ec)->ec_multiaddrs); \ 218 (enm) != NULL && \ 219 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 220 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 221 (enm) = LIST_NEXT((enm), enm_list)); \ 222 } 223 224 /* 225 * Macro to step through all of the ether_multi records, one at a time. 226 * The current position is remembered in "step", which the caller must 227 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 228 * and get the first record. Both macros return a NULL "enm" when there 229 * are no remaining records. 230 */ 231 #define ETHER_NEXT_MULTI(step, enm) \ 232 /* struct ether_multistep step; */ \ 233 /* struct ether_multi *enm; */ \ 234 { \ 235 if (((enm) = (step).e_enm) != NULL) \ 236 (step).e_enm = LIST_NEXT((enm), enm_list); \ 237 } 238 239 #define ETHER_FIRST_MULTI(step, ec, enm) \ 240 /* struct ether_multistep step; */ \ 241 /* struct ethercom *ec; */ \ 242 /* struct ether_multi *enm; */ \ 243 { \ 244 (step).e_enm = LIST_FIRST(&(ec)->ec_multiaddrs); \ 245 ETHER_NEXT_MULTI((step), (enm)); \ 246 } 247 248 #ifdef _KERNEL 249 250 /* 251 * Ethernet 802.1Q VLAN structures. 252 */ 253 254 /* add VLAN tag to input/received packet */ 255 #define VLAN_INPUT_TAG(ifp, m, vlanid, _errcase) \ 256 do { \ 257 struct m_tag *mtag = \ 258 m_tag_get(PACKET_TAG_VLAN, sizeof(u_int), M_NOWAIT);\ 259 if (mtag == NULL) { \ 260 ifp->if_ierrors++; \ 261 printf("%s: unable to allocate VLAN tag\n", \ 262 ifp->if_xname); \ 263 m_freem(m); \ 264 _errcase; \ 265 } \ 266 *(u_int *)(mtag + 1) = vlanid; \ 267 m_tag_prepend(m, mtag); \ 268 } while(0) 269 270 /* extract VLAN tag from output/trasmit packet */ 271 #define VLAN_OUTPUT_TAG(ec, m0) \ 272 VLAN_ATTACHED(ec) ? m_tag_find((m0), PACKET_TAG_VLAN, NULL) : NULL 273 274 /* extract VLAN ID value from a VLAN tag */ 275 #define VLAN_TAG_VALUE(mtag) \ 276 ((*(u_int *)(mtag + 1)) & 4095) 277 278 /* test if any VLAN is configured for this interface */ 279 #define VLAN_ATTACHED(ec) ((ec)->ec_nvlans > 0) 280 281 void ether_ifattach(struct ifnet *, const u_int8_t *); 282 void ether_ifdetach(struct ifnet *); 283 284 char *ether_sprintf(const u_int8_t *); 285 char *ether_snprintf(char *, size_t, const u_int8_t *); 286 287 u_int32_t ether_crc32_le(const u_int8_t *, size_t); 288 u_int32_t ether_crc32_be(const u_int8_t *, size_t); 289 290 int ether_nonstatic_aton(u_char *, char *); 291 #else 292 /* 293 * Prototype ethers(3) functions. 294 */ 295 #include <sys/cdefs.h> 296 __BEGIN_DECLS 297 char * ether_ntoa __P((const struct ether_addr *)); 298 struct ether_addr * 299 ether_aton __P((const char *)); 300 int ether_ntohost __P((char *, const struct ether_addr *)); 301 int ether_hostton __P((const char *, struct ether_addr *)); 302 int ether_line __P((const char *, struct ether_addr *, char *)); 303 __END_DECLS 304 #endif 305 306 #endif /* _STANDALONE */ 307 308 #endif /* !_NET_IF_ETHER_H_ */
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