1 /* $NetBSD: if_ether.h,v 1.25 1997/01/17 17:06:06 mikel Exp $ */
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35 * @(#)if_ether.h 8.1 (Berkeley) 6/10/93
41 * Ethernet address - 6 octets
42 * this is only used by the ethers(3) functions.
45 u_int8_t ether_addr_octet[6];
49 * Structure of a 10Mb/s Ethernet header.
51 #define ETHER_ADDR_LEN 6
54 u_int8_t ether_dhost[ETHER_ADDR_LEN];
55 u_int8_t ether_shost[ETHER_ADDR_LEN];
59 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */
60 #define ETHERTYPE_IP 0x0800 /* IP protocol */
61 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */
62 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */
65 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
66 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
67 * by an ETHER type (as given above) and then the (variable-length) header.
69 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
70 #define ETHERTYPE_NTRAILER 16
72 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
75 #define ETHERMIN (60-14)
79 * Macro to map an IP multicast address to an Ethernet multicast address.
80 * The high-order 25 bits of the Ethernet address are statically assigned,
81 * and the low-order 23 bits are taken from the low end of the IP address.
83 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
84 /* struct in_addr *ipaddr; */ \
85 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
90 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \
91 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \
92 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \
97 * Ethernet Address Resolution Protocol.
99 * See RFC 826 for protocol description. Structure below is adapted
100 * to resolving internet addresses. Field names used correspond to
104 struct arphdr ea_hdr; /* fixed-size header */
105 u_int8_t arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */
106 u_int8_t arp_spa[4]; /* sender protocol address */
107 u_int8_t arp_tha[ETHER_ADDR_LEN]; /* target hardware address */
108 u_int8_t arp_tpa[4]; /* target protocol address */
110 #define arp_hrd ea_hdr.ar_hrd
111 #define arp_pro ea_hdr.ar_pro
112 #define arp_hln ea_hdr.ar_hln
113 #define arp_pln ea_hdr.ar_pln
114 #define arp_op ea_hdr.ar_op
117 * Structure shared between the ethernet driver modules and
118 * the address resolution code. For example, each ec_softc or il_softc
119 * begins with this structure.
122 struct ifnet ac_if; /* network-visible interface */
123 u_int8_t ac_enaddr[ETHER_ADDR_LEN]; /* ethernet hardware address */
124 char ac__pad[2]; /* be nice to m68k ports */
125 LIST_HEAD(, ether_multi) ac_multiaddrs; /* list of ether multicast addrs */
126 int ac_multicnt; /* length of ac_multiaddrs list */
130 LIST_ENTRY(llinfo_arp) la_list;
131 struct rtentry *la_rt;
132 struct mbuf *la_hold; /* last packet until resolved/timeout */
133 long la_asked; /* last time we QUERIED for this addr */
134 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */
137 struct sockaddr_inarp {
141 struct in_addr sin_addr;
142 struct in_addr sin_srcaddr;
149 * IP and ethernet specific routing flags
151 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
152 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
155 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN];
156 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
157 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
158 struct ifqueue arpintrq;
160 void arpwhohas(struct arpcom *, struct in_addr *);
162 int arpresolve(struct arpcom *,
163 struct rtentry *, struct mbuf *, struct sockaddr *, u_char *);
164 void arp_ifinit(struct arpcom *, struct ifaddr *);
165 void arp_rtrequest(int, struct rtentry *, struct sockaddr *);
167 int ether_addmulti(struct ifreq *, struct arpcom *);
168 int ether_delmulti(struct ifreq *, struct arpcom *);
172 * Ethernet multicast address structure. There is one of these for each
173 * multicast address or range of multicast addresses that we are supposed
174 * to listen to on a particular interface. They are kept in a linked list,
175 * rooted in the interface's arpcom structure. (This really has nothing to
176 * do with ARP, or with the Internet address family, but this appears to be
177 * the minimally-disrupting place to put it.)
180 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */
181 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */
182 struct arpcom *enm_ac; /* back pointer to arpcom */
183 u_int enm_refcount; /* no. claims to this addr/range */
184 LIST_ENTRY(ether_multi) enm_list;
188 * Structure used by macros below to remember position when stepping through
189 * all of the ether_multi records.
191 struct ether_multistep {
192 struct ether_multi *e_enm;
196 * Macro for looking up the ether_multi record for a given range of Ethernet
197 * multicast addresses connected to a given arpcom structure. If no matching
198 * record is found, "enm" returns NULL.
200 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
201 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \
202 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \
203 /* struct arpcom *ac; */ \
204 /* struct ether_multi *enm; */ \
206 for ((enm) = (ac)->ac_multiaddrs.lh_first; \
208 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \
209 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \
210 (enm) = (enm)->enm_list.le_next); \
214 * Macro to step through all of the ether_multi records, one at a time.
215 * The current position is remembered in "step", which the caller must
216 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step"
217 * and get the first record. Both macros return a NULL "enm" when there
218 * are no remaining records.
220 #define ETHER_NEXT_MULTI(step, enm) \
221 /* struct ether_multistep step; */ \
222 /* struct ether_multi *enm; */ \
224 if (((enm) = (step).e_enm) != NULL) \
225 (step).e_enm = (enm)->enm_list.le_next; \
228 #define ETHER_FIRST_MULTI(step, ac, enm) \
229 /* struct ether_multistep step; */ \
230 /* struct arpcom *ac; */ \
231 /* struct ether_multi *enm; */ \
233 (step).e_enm = (ac)->ac_multiaddrs.lh_first; \
234 ETHER_NEXT_MULTI((step), (enm)); \
238 void arp_rtrequest(int, struct rtentry *, struct sockaddr *);
239 int arpresolve(struct arpcom *, struct rtentry *, struct mbuf *,
240 struct sockaddr *, u_char *);
242 int arpioctl(u_long, caddr_t);
243 void arp_ifinit(struct arpcom *, struct ifaddr *);
244 void revarpinput(struct mbuf *);
245 void in_revarpinput(struct mbuf *);
246 void revarprequest(struct ifnet *);
247 int revarpwhoarewe(struct ifnet *, struct in_addr *, struct in_addr *);
248 int revarpwhoami(struct in_addr *, struct ifnet *);
249 int db_show_arptab(void);
253 * Prototype ethers(3) functions.
256 #include <sys/cdefs.h>
258 char * ether_ntoa(struct ether_addr *);
261 int ether_ntohost(char *, struct ether_addr *);
262 int ether_hostton(char *, struct ether_addr *);
263 int ether_line(char *, struct ether_addr *, char *);