![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to if.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [CSRG BSD Unix] / 42BSD / sys / net|
Return to if.c CVS log | Up to [CSRG BSD Unix] / 42BSD / sys / net |
1.1 root 1: /* if.c 6.2 83/09/27 */
2:
3: #include "../h/param.h"
4: #include "../h/systm.h"
5: #include "../h/socket.h"
6: #include "../h/protosw.h"
7: #include "../h/dir.h"
8: #include "../h/user.h"
9: #include "../h/kernel.h"
10: #include "../h/ioctl.h"
11: #include "../h/errno.h"
12:
13: #include "../net/if.h"
14: #include "../net/af.h"
15:
16: int ifqmaxlen = IFQ_MAXLEN;
17:
18: /*
19: * Network interface utility routines.
20: *
21: * Routines with if_ifwith* names take sockaddr *'s as
22: * parameters. Other routines take value parameters,
23: * e.g. if_ifwithnet takes the network number.
24: */
25:
26: ifinit()
27: {
28: register struct ifnet *ifp;
29:
30: for (ifp = ifnet; ifp; ifp = ifp->if_next)
31: if (ifp->if_init) {
32: (*ifp->if_init)(ifp->if_unit);
33: if (ifp->if_snd.ifq_maxlen == 0)
34: ifp->if_snd.ifq_maxlen = ifqmaxlen;
35: }
36: if_slowtimo();
37: }
38:
39: #ifdef vax
40: /*
41: * Call each interface on a Unibus reset.
42: */
43: ifubareset(uban)
44: int uban;
45: {
46: register struct ifnet *ifp;
47:
48: for (ifp = ifnet; ifp; ifp = ifp->if_next)
49: if (ifp->if_reset)
50: (*ifp->if_reset)(ifp->if_unit, uban);
51: }
52: #endif
53:
54: /*
55: * Attach an interface to the
56: * list of "active" interfaces.
57: */
58: if_attach(ifp)
59: struct ifnet *ifp;
60: {
61: register struct ifnet **p = &ifnet;
62:
63: while (*p)
64: p = &((*p)->if_next);
65: *p = ifp;
66: }
67:
68: /*
69: * Locate an interface based on a complete address.
70: */
71: /*ARGSUSED*/
72: struct ifnet *
73: if_ifwithaddr(addr)
74: struct sockaddr *addr;
75: {
76: register struct ifnet *ifp;
77:
78: #define equal(a1, a2) \
79: (bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
80: for (ifp = ifnet; ifp; ifp = ifp->if_next) {
81: if (ifp->if_addr.sa_family != addr->sa_family)
82: continue;
83: if (equal(&ifp->if_addr, addr))
84: break;
85: if ((ifp->if_flags & IFF_BROADCAST) &&
86: equal(&ifp->if_broadaddr, addr))
87: break;
88: }
89: return (ifp);
90: }
91:
92: /*
93: * Find an interface on a specific network. If many, choice
94: * is first found.
95: */
96: struct ifnet *
97: if_ifwithnet(addr)
98: register struct sockaddr *addr;
99: {
100: register struct ifnet *ifp;
101: register u_int af = addr->sa_family;
102: register int (*netmatch)();
103:
104: if (af >= AF_MAX)
105: return (0);
106: netmatch = afswitch[af].af_netmatch;
107: for (ifp = ifnet; ifp; ifp = ifp->if_next) {
108: if (af != ifp->if_addr.sa_family)
109: continue;
110: if ((*netmatch)(addr, &ifp->if_addr))
111: break;
112: }
113: return (ifp);
114: }
115:
116: /*
117: * As above, but parameter is network number.
118: */
119: struct ifnet *
120: if_ifonnetof(net)
121: register int net;
122: {
123: register struct ifnet *ifp;
124:
125: for (ifp = ifnet; ifp; ifp = ifp->if_next)
126: if (ifp->if_net == net)
127: break;
128: return (ifp);
129: }
130:
131: /*
132: * Find an interface using a specific address family
133: */
134: struct ifnet *
135: if_ifwithaf(af)
136: register int af;
137: {
138: register struct ifnet *ifp;
139:
140: for (ifp = ifnet; ifp; ifp = ifp->if_next)
141: if (ifp->if_addr.sa_family == af)
142: break;
143: return (ifp);
144: }
145:
146: /*
147: * Mark an interface down and notify protocols of
148: * the transition.
149: * NOTE: must be called at splnet or eqivalent.
150: */
151: if_down(ifp)
152: register struct ifnet *ifp;
153: {
154:
155: ifp->if_flags &= ~IFF_UP;
156: pfctlinput(PRC_IFDOWN, (caddr_t)&ifp->if_addr);
157: }
158:
159: /*
160: * Handle interface watchdog timer routines. Called
161: * from softclock, we decrement timers (if set) and
162: * call the appropriate interface routine on expiration.
163: */
164: if_slowtimo()
165: {
166: register struct ifnet *ifp;
167:
168: for (ifp = ifnet; ifp; ifp = ifp->if_next) {
169: if (ifp->if_timer == 0 || --ifp->if_timer)
170: continue;
171: if (ifp->if_watchdog)
172: (*ifp->if_watchdog)(ifp->if_unit);
173: }
174: timeout(if_slowtimo, (caddr_t)0, hz / IFNET_SLOWHZ);
175: }
176:
177: /*
178: * Map interface name to
179: * interface structure pointer.
180: */
181: struct ifnet *
182: ifunit(name)
183: register char *name;
184: {
185: register char *cp;
186: register struct ifnet *ifp;
187: int unit;
188:
189: for (cp = name; cp < name + IFNAMSIZ && *cp; cp++)
190: if (*cp >= '0' && *cp <= '9')
191: break;
192: if (*cp == '\0' || cp == name + IFNAMSIZ)
193: return ((struct ifnet *)0);
194: unit = *cp - '0', *cp = 0;
195: for (ifp = ifnet; ifp; ifp = ifp->if_next) {
196: if (bcmp(ifp->if_name, name, (unsigned)(cp - name)))
197: continue;
198: if (unit == ifp->if_unit)
199: break;
200: }
201: return (ifp);
202: }
203:
204: /*
205: * Interface ioctls.
206: */
207: ifioctl(cmd, data)
208: int cmd;
209: caddr_t data;
210: {
211: register struct ifnet *ifp;
212: register struct ifreq *ifr;
213:
214: switch (cmd) {
215:
216: case SIOCGIFCONF:
217: return (ifconf(cmd, data));
218:
219: case SIOCSIFADDR:
220: case SIOCSIFFLAGS:
221: case SIOCSIFDSTADDR:
222: if (!suser())
223: return (u.u_error);
224: break;
225: }
226: ifr = (struct ifreq *)data;
227: ifp = ifunit(ifr->ifr_name);
228: if (ifp == 0)
229: return (ENXIO);
230: switch (cmd) {
231:
232: case SIOCGIFADDR:
233: ifr->ifr_addr = ifp->if_addr;
234: break;
235:
236: case SIOCGIFDSTADDR:
237: if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
238: return (EINVAL);
239: ifr->ifr_dstaddr = ifp->if_dstaddr;
240: break;
241:
242: case SIOCGIFFLAGS:
243: ifr->ifr_flags = ifp->if_flags;
244: break;
245:
246: case SIOCSIFFLAGS:
247: if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
248: int s = splimp();
249: if_down(ifp);
250: splx(s);
251: }
252: ifp->if_flags = ifr->ifr_flags;
253: break;
254:
255: default:
256: if (ifp->if_ioctl == 0)
257: return (EOPNOTSUPP);
258: return ((*ifp->if_ioctl)(ifp, cmd, data));
259: }
260: return (0);
261: }
262:
263: /*
264: * Return interface configuration
265: * of system. List may be used
266: * in later ioctl's (above) to get
267: * other information.
268: */
269: /*ARGSUSED*/
270: ifconf(cmd, data)
271: int cmd;
272: caddr_t data;
273: {
274: register struct ifconf *ifc = (struct ifconf *)data;
275: register struct ifnet *ifp = ifnet;
276: register char *cp, *ep;
277: struct ifreq ifr, *ifrp;
278: int space = ifc->ifc_len, error = 0;
279:
280: ifrp = ifc->ifc_req;
281: ep = ifr.ifr_name + sizeof (ifr.ifr_name) - 2;
282: for (; space > sizeof (ifr) && ifp; ifp = ifp->if_next) {
283: bcopy(ifp->if_name, ifr.ifr_name, sizeof (ifr.ifr_name) - 2);
284: for (cp = ifr.ifr_name; cp < ep && *cp; cp++)
285: ;
286: *cp++ = '0' + ifp->if_unit; *cp = '\0';
287: ifr.ifr_addr = ifp->if_addr;
288: error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr));
289: if (error)
290: break;
291: space -= sizeof (ifr), ifrp++;
292: }
293: ifc->ifc_len -= space;
294: return (error);
295: }
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.