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132c65ba KF |
1 | /* |
2 | * Copyright (c) 1982, 1986, 1988 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
16 | * | |
17 | * @(#)if_ethersubr.c 1.1 (Berkeley) %G% | |
18 | */ | |
19 | ||
20 | #include "param.h" | |
21 | #include "systm.h" | |
22 | #include "malloc.h" | |
23 | #include "mbuf.h" | |
24 | #include "protosw.h" | |
25 | #include "socket.h" | |
26 | #include "ioctl.h" | |
27 | #include "errno.h" | |
28 | #include "syslog.h" | |
29 | ||
30 | #include "if.h" | |
31 | #include "netisr.h" | |
32 | #include "route.h" | |
33 | ||
34 | #include "../machine/mtpr.h" | |
35 | ||
36 | #ifdef INET | |
37 | #include "../netinet/in.h" | |
38 | #include "../netinet/in_var.h" | |
39 | #include "../netinet/if_ether.h" | |
40 | #endif | |
41 | ||
42 | #ifdef NS | |
43 | #include "../netns/ns.h" | |
44 | #include "../netns/ns_if.h" | |
45 | #endif | |
46 | ||
47 | u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; | |
48 | ||
49 | /* | |
50 | * Ethernet output routine. | |
51 | * Encapsulate a packet of type family for the local net. | |
52 | * Use trailer local net encapsulation if enough data in first | |
53 | * packet leaves a multiple of 512 bytes of data in remainder. | |
54 | * Assumes that ifp is actually pointer to arpcom structure. | |
55 | */ | |
56 | enoutput(ifp, m0, dst) | |
57 | register struct ifnet *ifp; | |
58 | struct mbuf *m0; | |
59 | struct sockaddr *dst; | |
60 | { | |
61 | int type, s, error; | |
62 | u_char edst[6]; | |
63 | struct in_addr idst; | |
64 | register struct mbuf *m = m0; | |
65 | register struct ether_header *eh; | |
66 | register int off; | |
67 | int usetrailers; | |
68 | #define ac ((struct arpcom *)ifp) | |
69 | ||
70 | if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { | |
71 | error = ENETDOWN; | |
72 | goto bad; | |
73 | } | |
74 | switch (dst->sa_family) { | |
75 | ||
76 | #ifdef INET | |
77 | case AF_INET: | |
78 | idst = ((struct sockaddr_in *)dst)->sin_addr; | |
79 | if (!arpresolve(ac, m, &idst, edst, &usetrailers)) | |
80 | return (0); /* if not yet resolved */ | |
81 | off = m->m_pkthdr.len - m->m_len; | |
82 | if (usetrailers && off > 0 && (off & 0x1ff) == 0 && | |
83 | (m->m_flags & M_EXT) == 0 && | |
84 | m->m_data >= m->m_pktdat + 2 * sizeof (u_short)) { | |
85 | type = ETHERTYPE_TRAIL + (off>>9); | |
86 | m->m_data -= 2 * sizeof (u_short); | |
87 | m->m_len += 2 * sizeof (u_short); | |
88 | *mtod(m, u_short *) = htons((u_short)ETHERTYPE_IP); | |
89 | *(mtod(m, u_short *) + 1) = htons((u_short)m->m_len); | |
90 | goto gottrailertype; | |
91 | } | |
92 | type = ETHERTYPE_IP; | |
93 | off = 0; | |
94 | goto gottype; | |
95 | #endif | |
96 | #ifdef NS | |
97 | case AF_NS: | |
98 | type = ETHERTYPE_NS; | |
99 | bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), | |
100 | (caddr_t)edst, sizeof (edst)); | |
101 | off = 0; | |
102 | goto gottype; | |
103 | #endif | |
104 | ||
105 | case AF_UNSPEC: | |
106 | eh = (struct ether_header *)dst->sa_data; | |
107 | bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst)); | |
108 | type = eh->ether_type; | |
109 | goto gottype; | |
110 | ||
111 | default: | |
112 | printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, | |
113 | dst->sa_family); | |
114 | error = EAFNOSUPPORT; | |
115 | goto bad; | |
116 | } | |
117 | ||
118 | gottrailertype: | |
119 | /* | |
120 | * Packet to be sent as trailer: move first packet | |
121 | * (control information) to end of chain. | |
122 | */ | |
123 | while (m->m_next) | |
124 | m = m->m_next; | |
125 | m->m_next = m0; | |
126 | m = m0->m_next; | |
127 | m0->m_next = 0; | |
128 | m0 = m; | |
129 | ||
130 | gottype: | |
131 | /* | |
132 | * Add local net header. If no space in first mbuf, | |
133 | * allocate another. | |
134 | */ | |
135 | M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); | |
136 | if (m == 0) { | |
137 | error = ENOBUFS; | |
138 | goto bad; | |
139 | } | |
140 | eh = mtod(m, struct ether_header *); | |
141 | eh->ether_type = htons((u_short)type); | |
142 | bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst)); | |
143 | bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost, | |
144 | sizeof(eh->ether_shost)); | |
145 | ||
146 | /* | |
147 | * Queue message on interface, and start output if interface | |
148 | * not yet active. | |
149 | */ | |
150 | s = splimp(); | |
151 | if (IF_QFULL(&ifp->if_snd)) { | |
152 | IF_DROP(&ifp->if_snd); | |
153 | splx(s); | |
154 | m_freem(m); | |
155 | return (ENOBUFS); | |
156 | } | |
157 | IF_ENQUEUE(&ifp->if_snd, m); | |
158 | if ((ifp->if_flags & IFF_OACTIVE) == 0) | |
159 | (*ifp->if_start)(ifp->if_unit); | |
160 | splx(s); | |
161 | return (0); | |
162 | ||
163 | bad: | |
164 | m_freem(m0); | |
165 | return (error); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Pull packet off interface. Off is nonzero if packet | |
170 | * has trailing header; we still have to drop | |
171 | * the type and length which are at the front of any trailer data. | |
172 | */ | |
173 | en_doproto(ifp, eh, m) | |
174 | struct ifnet *ifp; | |
175 | register struct ether_header *eh; | |
176 | struct mbuf *m; | |
177 | { | |
178 | register struct ifqueue *inq; | |
179 | int s; | |
180 | ||
181 | if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_shost, | |
182 | sizeof(etherbroadcastaddr)) == 0) | |
183 | m->m_flags |= M_BCAST; | |
184 | ||
185 | switch (eh->ether_type) { | |
186 | #ifdef INET | |
187 | case ETHERTYPE_IP: | |
188 | schednetisr(NETISR_IP); | |
189 | inq = &ipintrq; | |
190 | break; | |
191 | ||
192 | case ETHERTYPE_ARP: | |
193 | arpinput((struct arpcom *)ifp, m); | |
194 | return; | |
195 | #endif | |
196 | #ifdef NS | |
197 | case ETHERTYPE_NS: | |
198 | schednetisr(NETISR_NS); | |
199 | inq = &nsintrq; | |
200 | break; | |
201 | ||
202 | #endif | |
203 | default: | |
204 | m_freem(m); | |
205 | return; | |
206 | } | |
207 | ||
208 | s = splimp(); | |
209 | if (IF_QFULL(inq)) { | |
210 | IF_DROP(inq); | |
211 | m_freem(m); | |
212 | } else | |
213 | IF_ENQUEUE(inq, m); | |
214 | splx(s); | |
215 | } | |
216 | ||
217 | /* | |
218 | * Convert Ethernet address to printable (loggable) representation. | |
219 | */ | |
220 | char * | |
221 | ether_sprintf(ap) | |
222 | register u_char *ap; | |
223 | { | |
224 | register i; | |
225 | static char etherbuf[18]; | |
226 | register char *cp = etherbuf; | |
227 | static char digits[] = "0123456789abcdef"; | |
228 | ||
229 | for (i = 0; i < 6; i++) { | |
230 | *cp++ = digits[*ap >> 4]; | |
231 | *cp++ = digits[*ap++ & 0xf]; | |
232 | *cp++ = ':'; | |
233 | } | |
234 | *--cp = 0; | |
235 | return (etherbuf); | |
236 | } |