1 /* $NetBSD: if_ether.h,v 1.25 1997/01/17 17:06:06 mikel Exp $ */
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31 * @(#)if_ether.h 8.1 (Berkeley) 6/10/93
37 * Ethernet address - 6 octets
38 * this is only used by the ethers(3) functions.
41 u_int8_t ether_addr_octet[6];
45 * Structure of a 10Mb/s Ethernet header.
47 #define ETHER_ADDR_LEN 6
50 u_int8_t ether_dhost[ETHER_ADDR_LEN];
51 u_int8_t ether_shost[ETHER_ADDR_LEN];
55 #define ETHERTYPE_PUP 0x0200 /* PUP protocol */
56 #define ETHERTYPE_IP 0x0800 /* IP protocol */
57 #define ETHERTYPE_ARP 0x0806 /* address resolution protocol */
58 #define ETHERTYPE_REVARP 0x8035 /* reverse addr resolution protocol */
61 * The ETHERTYPE_NTRAILER packet types starting at ETHERTYPE_TRAIL have
62 * (type-ETHERTYPE_TRAIL)*512 bytes of data followed
63 * by an ETHER type (as given above) and then the (variable-length) header.
65 #define ETHERTYPE_TRAIL 0x1000 /* Trailer packet */
66 #define ETHERTYPE_NTRAILER 16
68 #define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
71 #define ETHERMIN (60-14)
75 * Macro to map an IP multicast address to an Ethernet multicast address.
76 * The high-order 25 bits of the Ethernet address are statically assigned,
77 * and the low-order 23 bits are taken from the low end of the IP address.
79 #define ETHER_MAP_IP_MULTICAST(ipaddr, enaddr) \
80 /* struct in_addr *ipaddr; */ \
81 /* u_int8_t enaddr[ETHER_ADDR_LEN]; */ \
86 (enaddr)[3] = ((u_int8_t *)ipaddr)[1] & 0x7f; \
87 (enaddr)[4] = ((u_int8_t *)ipaddr)[2]; \
88 (enaddr)[5] = ((u_int8_t *)ipaddr)[3]; \
93 * Ethernet Address Resolution Protocol.
95 * See RFC 826 for protocol description. Structure below is adapted
96 * to resolving internet addresses. Field names used correspond to
100 struct arphdr ea_hdr; /* fixed-size header */
101 u_int8_t arp_sha[ETHER_ADDR_LEN]; /* sender hardware address */
102 u_int8_t arp_spa[4]; /* sender protocol address */
103 u_int8_t arp_tha[ETHER_ADDR_LEN]; /* target hardware address */
104 u_int8_t arp_tpa[4]; /* target protocol address */
106 #define arp_hrd ea_hdr.ar_hrd
107 #define arp_pro ea_hdr.ar_pro
108 #define arp_hln ea_hdr.ar_hln
109 #define arp_pln ea_hdr.ar_pln
110 #define arp_op ea_hdr.ar_op
113 * Structure shared between the ethernet driver modules and
114 * the address resolution code. For example, each ec_softc or il_softc
115 * begins with this structure.
118 struct ifnet ac_if; /* network-visible interface */
119 u_int8_t ac_enaddr[ETHER_ADDR_LEN]; /* ethernet hardware address */
120 char ac__pad[2]; /* be nice to m68k ports */
121 LIST_HEAD(, ether_multi) ac_multiaddrs; /* list of ether multicast addrs */
122 int ac_multicnt; /* length of ac_multiaddrs list */
126 LIST_ENTRY(llinfo_arp) la_list;
127 struct rtentry *la_rt;
128 struct mbuf *la_hold; /* last packet until resolved/timeout */
129 long la_asked; /* last time we QUERIED for this addr */
130 #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */
133 struct sockaddr_inarp {
137 struct in_addr sin_addr;
138 struct in_addr sin_srcaddr;
145 * IP and ethernet specific routing flags
147 #define RTF_USETRAILERS RTF_PROTO1 /* use trailers */
148 #define RTF_ANNOUNCE RTF_PROTO2 /* announce new arp entry */
151 u_int8_t etherbroadcastaddr[ETHER_ADDR_LEN];
152 u_int8_t ether_ipmulticast_min[ETHER_ADDR_LEN];
153 u_int8_t ether_ipmulticast_max[ETHER_ADDR_LEN];
154 struct ifqueue arpintrq;
156 void arpwhohas(struct arpcom *, struct in_addr *);
158 int arpresolve(struct arpcom *,
159 struct rtentry *, struct mbuf *, struct sockaddr *, u_char *, struct llentry **);
160 void arp_ifinit(struct arpcom *, struct ifaddr *);
161 void arp_rtrequest(int, struct rtentry *, struct sockaddr *);
163 int ether_addmulti(struct ifreq *, struct arpcom *);
164 int ether_delmulti(struct ifreq *, struct arpcom *);
168 * Ethernet multicast address structure. There is one of these for each
169 * multicast address or range of multicast addresses that we are supposed
170 * to listen to on a particular interface. They are kept in a linked list,
171 * rooted in the interface's arpcom structure. (This really has nothing to
172 * do with ARP, or with the Internet address family, but this appears to be
173 * the minimally-disrupting place to put it.)
176 u_int8_t enm_addrlo[ETHER_ADDR_LEN]; /* low or only address of range */
177 u_int8_t enm_addrhi[ETHER_ADDR_LEN]; /* high or only address of range */
178 struct arpcom *enm_ac; /* back pointer to arpcom */
179 u_int enm_refcount; /* no. claims to this addr/range */
180 LIST_ENTRY(ether_multi) enm_list;
184 * Structure used by macros below to remember position when stepping through
185 * all of the ether_multi records.
187 struct ether_multistep {
188 struct ether_multi *e_enm;
192 * Macro for looking up the ether_multi record for a given range of Ethernet
193 * multicast addresses connected to a given arpcom structure. If no matching
194 * record is found, "enm" returns NULL.
196 #define ETHER_LOOKUP_MULTI(addrlo, addrhi, ac, enm) \
197 /* u_int8_t addrlo[ETHER_ADDR_LEN]; */ \
198 /* u_int8_t addrhi[ETHER_ADDR_LEN]; */ \
199 /* struct arpcom *ac; */ \
200 /* struct ether_multi *enm; */ \
202 for ((enm) = (ac)->ac_multiaddrs.lh_first; \
204 (bcmp((enm)->enm_addrlo, (addrlo), ETHER_ADDR_LEN) != 0 || \
205 bcmp((enm)->enm_addrhi, (addrhi), ETHER_ADDR_LEN) != 0); \
206 (enm) = (enm)->enm_list.le_next); \
210 * Macro to step through all of the ether_multi records, one at a time.
211 * The current position is remembered in "step", which the caller must
212 * provide. ETHER_FIRST_MULTI(), below, must be called to initialize "step"
213 * and get the first record. Both macros return a NULL "enm" when there
214 * are no remaining records.
216 #define ETHER_NEXT_MULTI(step, enm) \
217 /* struct ether_multistep step; */ \
218 /* struct ether_multi *enm; */ \
220 if (((enm) = (step).e_enm) != NULL) \
221 (step).e_enm = (enm)->enm_list.le_next; \
224 #define ETHER_FIRST_MULTI(step, ac, enm) \
225 /* struct ether_multistep step; */ \
226 /* struct arpcom *ac; */ \
227 /* struct ether_multi *enm; */ \
229 (step).e_enm = (ac)->ac_multiaddrs.lh_first; \
230 ETHER_NEXT_MULTI((step), (enm)); \
234 void arp_rtrequest(int, struct rtentry *, struct sockaddr *);
235 int arpresolve(struct arpcom *, struct rtentry *, struct mbuf *,
236 struct sockaddr *, u_char *, struct llentry **);
238 int arpioctl(u_long, caddr_t);
239 void arp_ifinit(struct arpcom *, struct ifaddr *);
240 void revarpinput(struct mbuf *);
241 void in_revarpinput(struct mbuf *);
242 void revarprequest(struct ifnet *);
243 int revarpwhoarewe(struct ifnet *, struct in_addr *, struct in_addr *);
244 int revarpwhoami(struct in_addr *, struct ifnet *);
245 int db_show_arptab(void);
249 * Prototype ethers(3) functions.
252 #include <sys/cdefs.h>
254 char * ether_ntoa(struct ether_addr *);
257 int ether_ntohost(char *, struct ether_addr *);
258 int ether_hostton(char *, struct ether_addr *);
259 int ether_line(char *, struct ether_addr *, char *);