if_ether.h revision 1.59
1 /* $NetBSD: if_ether.h,v 1.59 2012/09/30 05:08:08 dholland 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 #ifndef _STANDALONE 45 #include <net/if.h> 46 #endif 47 48 /* 49 * Some basic Ethernet constants. 50 */ 51 #define ETHER_ADDR_LEN 6 /* length of an Ethernet address */ 52 #define ETHER_TYPE_LEN 2 /* length of the Ethernet type field */ 53 #define ETHER_CRC_LEN 4 /* length of the Ethernet CRC */ 54 #define ETHER_HDR_LEN ((ETHER_ADDR_LEN * 2) + ETHER_TYPE_LEN) 55 #define ETHER_MIN_LEN 64 /* minimum frame length, including CRC */ 56 #define ETHER_MAX_LEN 1518 /* maximum frame length, including CRC */ 57 #define ETHER_MAX_LEN_JUMBO 9018 /* maximum jumbo frame len, including CRC */ 58 59 /* 60 * Some Ethernet extensions. 61 */ 62 #define ETHER_VLAN_ENCAP_LEN 4 /* length of 802.1Q VLAN encapsulation */ 63 #define ETHER_PPPOE_ENCAP_LEN 8 /* length of PPPoE encapsulation */ 64 65 /* 66 * Ethernet address - 6 octets 67 * this is only used by the ethers(3) functions. 68 */ 69 struct ether_addr { 70 uint8_t ether_addr_octet[ETHER_ADDR_LEN]; 71 } __packed; 72 73 /* 74 * Structure of a 10Mb/s Ethernet header. 75 */ 76 struct ether_header { 77 uint8_t ether_dhost[ETHER_ADDR_LEN]; 78 uint8_t ether_shost[ETHER_ADDR_LEN]; 79 uint16_t ether_type; 80 } __packed; 81 82 #include <net/ethertypes.h> 83 84 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */ 85 #define ETHER_IS_LOCAL(addr) (*(addr) & 0x02) /* is address local? */ 86 87 #define ETHERMTU_JUMBO (ETHER_MAX_LEN_JUMBO - ETHER_HDR_LEN - ETHER_CRC_LEN) 88 #define ETHERMTU (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 89 #define ETHERMIN (ETHER_MIN_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 90 91 /* 92 * Compute the maximum frame size based on ethertype (i.e. possible 93 * encapsulation) and whether or not an FCS is present. 94 */ 95 #define ETHER_MAX_FRAME(ifp, etype, hasfcs) \ 96 ((ifp)->if_mtu + ETHER_HDR_LEN + \ 97 ((hasfcs) ? ETHER_CRC_LEN : 0) + \ 98 (((etype) == ETHERTYPE_VLAN) ? ETHER_VLAN_ENCAP_LEN : 0) + \ 99 (((etype) == ETHERTYPE_PPPOE) ? ETHER_PPPOE_ENCAP_LEN : 0)) 100 101 /* 102 * Ethernet CRC32 polynomials (big- and little-endian verions). 103 */ 104 #define ETHER_CRC_POLY_LE 0xedb88320 105 #define ETHER_CRC_POLY_BE 0x04c11db6 106 107 #ifndef _STANDALONE 108 109 /* 110 * Ethernet-specific mbuf flags. 111 */ 112 #define M_HASFCS M_LINK0 /* FCS included at end of frame */ 113 #define M_PROMISC M_LINK1 /* this packet is not for us */ 114 115 #ifdef _KERNEL 116 /* 117 * Macro to map an IP multicast address to an Ethernet multicast address. 118 * The high-order 25 bits of the Ethernet address are statically assigned, 119 * and the low-order 23 bits are taken from the low end of the IP address. 120 */ 121 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \ 122 /* const struct in_addr *ipaddr; */ \ 123 /* uint8_t enaddr[ETHER_ADDR_LEN]; */ \ 124 do { \ 125 (enaddr)[0] = 0x01; \ 126 (enaddr)[1] = 0x00; \ 127 (enaddr)[2] = 0x5e; \ 128 (enaddr)[3] = ((const uint8_t *)ipaddr)[1] & 0x7f; \ 129 (enaddr)[4] = ((const uint8_t *)ipaddr)[2]; \ 130 (enaddr)[5] = ((const uint8_t *)ipaddr)[3]; \ 131 } while (/*CONSTCOND*/0) 132 /* 133 * Macro to map an IP6 multicast address to an Ethernet multicast address. 134 * The high-order 16 bits of the Ethernet address are statically assigned, 135 * and the low-order 32 bits are taken from the low end of the IP6 address. 136 */ 137 #define ETHER_MAP_IPV6_MULTICAST(ip6addr, enaddr) \ 138 /* struct in6_addr *ip6addr; */ \ 139 /* uint8_t enaddr[ETHER_ADDR_LEN]; */ \ 140 { \ 141 (enaddr)[0] = 0x33; \ 142 (enaddr)[1] = 0x33; \ 143 (enaddr)[2] = ((const uint8_t *)ip6addr)[12]; \ 144 (enaddr)[3] = ((const uint8_t *)ip6addr)[13]; \ 145 (enaddr)[4] = ((const uint8_t *)ip6addr)[14]; \ 146 (enaddr)[5] = ((const uint8_t *)ip6addr)[15]; \ 147 } 148 #endif 149 150 struct mii_data; 151 152 struct ethercom; 153 154 typedef int (*ether_cb_t)(struct ethercom *); 155 156 /* 157 * Structure shared between the ethernet driver modules and 158 * the multicast list code. For example, each ec_softc or il_softc 159 * begins with this structure. 160 */ 161 struct ethercom { 162 struct ifnet ec_if; /* network-visible interface */ 163 LIST_HEAD(, ether_multi) ec_multiaddrs; /* list of ether multicast 164 addrs */ 165 int ec_multicnt; /* length of ec_multiaddrs 166 list */ 167 int ec_capabilities; /* capabilities, provided by 168 driver */ 169 int ec_capenable; /* tells hardware which 170 capabilities to enable */ 171 172 int ec_nvlans; /* # VLANs on this interface */ 173 /* The device handle for the MII bus child device. */ 174 struct mii_data *ec_mii; 175 /* Called after a change to ec_if.if_flags. Returns 176 * ENETRESET if the device should be reinitialized with 177 * ec_if.if_init, 0 on success, not 0 on failure. 178 */ 179 ether_cb_t ec_ifflags_cb; 180 #ifdef MBUFTRACE 181 struct mowner ec_rx_mowner; /* mbufs received */ 182 struct mowner ec_tx_mowner; /* mbufs transmitted */ 183 #endif 184 }; 185 186 #define ETHERCAP_VLAN_MTU 0x00000001 /* VLAN-compatible MTU */ 187 #define ETHERCAP_VLAN_HWTAGGING 0x00000002 /* hardware VLAN tag support */ 188 #define ETHERCAP_JUMBO_MTU 0x00000004 /* 9000 byte MTU supported */ 189 190 #ifdef _KERNEL 191 extern const uint8_t etherbroadcastaddr[ETHER_ADDR_LEN]; 192 extern const uint8_t ethermulticastaddr_slowprotocols[ETHER_ADDR_LEN]; 193 extern const uint8_t ether_ipmulticast_min[ETHER_ADDR_LEN]; 194 extern const uint8_t ether_ipmulticast_max[ETHER_ADDR_LEN]; 195 196 void ether_set_ifflags_cb(struct ethercom *, ether_cb_t); 197 int ether_ioctl(struct ifnet *, u_long, void *); 198 int ether_addmulti(const struct sockaddr *, struct ethercom *); 199 int ether_delmulti(const struct sockaddr *, struct ethercom *); 200 int ether_multiaddr(const struct sockaddr *, uint8_t[], uint8_t[]); 201 #endif /* _KERNEL */ 202 203 /* 204 * Ethernet multicast address structure. There is one of these for each 205 * multicast address or range of multicast addresses that we are supposed 206 * to listen to on a particular interface. They are kept in a linked list, 207 * rooted in the interface's ethercom structure. 208 */ 209 struct ether_multi { 210 uint8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */ 211 uint8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */ 212 u_int enm_refcount; /* no. claims to this addr/range */ 213 LIST_ENTRY(ether_multi) enm_list; 214 }; 215 216 /* 217 * Structure used by macros below to remember position when stepping through 218 * all of the ether_multi records. 219 */ 220 struct ether_multistep { 221 struct ether_multi *e_enm; 222 }; 223 224 /* 225 * Macro for looking up the ether_multi record for a given range of Ethernet 226 * multicast addresses connected to a given ethercom structure. If no matching 227 * record is found, "enm" returns NULL. 228 */ 229 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ec, enm) \ 230 /* uint8_t addrlo[ETHER_ADDR_LEN]; */ \ 231 /* uint8_t addrhi[ETHER_ADDR_LEN]; */ \ 232 /* struct ethercom *ec; */ \ 233 /* struct ether_multi *enm; */ \ 234 { \ 235 for ((enm) = LIST_FIRST(&(ec)->ec_multiaddrs); \ 236 (enm) != NULL && \ 237 (memcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \ 238 memcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \ 239 (enm) = LIST_NEXT((enm), enm_list)); \ 240 } 241 242 /* 243 * Macro to step through all of the ether_multi records, one at a time. 244 * The current position is remembered in "step", which the caller must 245 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step" 246 * and get the first record. Both macros return a NULL "enm" when there 247 * are no remaining records. 248 */ 249 #define ETHER_NEXT_MULTI(step, enm) \ 250 /* struct ether_multistep step; */ \ 251 /* struct ether_multi *enm; */ \ 252 { \ 253 if (((enm) = (step).e_enm) != NULL) \ 254 (step).e_enm = LIST_NEXT((enm), enm_list); \ 255 } 256 257 #define ETHER_FIRST_MULTI(step, ec, enm) \ 258 /* struct ether_multistep step; */ \ 259 /* struct ethercom *ec; */ \ 260 /* struct ether_multi *enm; */ \ 261 { \ 262 (step).e_enm = LIST_FIRST(&(ec)->ec_multiaddrs); \ 263 ETHER_NEXT_MULTI((step), (enm)); \ 264 } 265 266 #ifdef _KERNEL 267 268 /* 269 * Ethernet 802.1Q VLAN structures. 270 */ 271 272 /* add VLAN tag to input/received packet */ 273 static inline int vlan_input_tag(struct ifnet *, struct mbuf *, u_int); 274 static inline int 275 vlan_input_tag(struct ifnet *ifp, struct mbuf *m, u_int vlanid) 276 { 277 struct m_tag *mtag; 278 mtag = m_tag_get(PACKET_TAG_VLAN, sizeof(u_int), M_NOWAIT); 279 if (mtag == NULL) { 280 ifp->if_ierrors++; 281 printf("%s: unable to allocate VLAN tag\n", ifp->if_xname); 282 m_freem(m); 283 return 1; 284 } 285 *(u_int *)(mtag + 1) = vlanid; 286 m_tag_prepend(m, mtag); 287 return 0; 288 } 289 290 #define VLAN_INPUT_TAG(ifp, m, vlanid, _errcase) \ 291 if (vlan_input_tag(ifp, m, vlanid) != 0) { \ 292 _errcase; \ 293 } 294 295 /* extract VLAN tag from output/trasmit packet */ 296 #define VLAN_OUTPUT_TAG(ec, m0) \ 297 (VLAN_ATTACHED(ec) ? m_tag_find((m0), PACKET_TAG_VLAN, NULL) : NULL) 298 299 /* extract VLAN ID value from a VLAN tag */ 300 #define VLAN_TAG_VALUE(mtag) \ 301 ((*(u_int *)(mtag + 1)) & 4095) 302 303 /* test if any VLAN is configured for this interface */ 304 #define VLAN_ATTACHED(ec) ((ec)->ec_nvlans > 0) 305 306 void ether_ifattach(struct ifnet *, const uint8_t *); 307 void ether_ifdetach(struct ifnet *); 308 int ether_mediachange(struct ifnet *); 309 void ether_mediastatus(struct ifnet *, struct ifmediareq *); 310 311 char *ether_sprintf(const uint8_t *); 312 char *ether_snprintf(char *, size_t, const uint8_t *); 313 314 uint32_t ether_crc32_le(const uint8_t *, size_t); 315 uint32_t ether_crc32_be(const uint8_t *, size_t); 316 317 int ether_aton_r(u_char *, size_t, const char *); 318 #else 319 /* 320 * Prototype ethers(3) functions. 321 */ 322 #include <sys/cdefs.h> 323 __BEGIN_DECLS 324 char * ether_ntoa(const struct ether_addr *); 325 struct ether_addr * 326 ether_aton(const char *); 327 int ether_ntohost(char *, const struct ether_addr *); 328 int ether_hostton(const char *, struct ether_addr *); 329 int ether_line(const char *, struct ether_addr *, char *); 330 __END_DECLS 331 #endif 332 333 #endif /* _STANDALONE */ 334 335 #endif /* !_NET_IF_ETHER_H_ */ 336
Indexes created Wed Sep 24 05:09:52 GMT 2025