Annotation of src/sys/netinet/raw_ip.c, Revision 1.1.1.1
1.1 cgd 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, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)raw_ip.c 7.8 (Berkeley) 7/25/90
34: */
35:
36: #include "param.h"
37: #include "malloc.h"
38: #include "mbuf.h"
39: #include "socket.h"
40: #include "protosw.h"
41: #include "socketvar.h"
42: #include "errno.h"
43:
44: #include "../net/if.h"
45: #include "../net/route.h"
46: #include "../net/raw_cb.h"
47:
48: #include "in.h"
49: #include "in_systm.h"
50: #include "ip.h"
51: #include "ip_var.h"
52: #include "in_pcb.h"
53:
54: /*
55: * Raw interface to IP protocol.
56: */
57:
58: struct sockaddr_in ripdst = { sizeof(ripdst), AF_INET };
59: struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
60: struct sockproto ripproto = { PF_INET };
61: /*
62: * Setup generic address and protocol structures
63: * for raw_input routine, then pass them along with
64: * mbuf chain.
65: */
66: rip_input(m)
67: struct mbuf *m;
68: {
69: register struct ip *ip = mtod(m, struct ip *);
70:
71: ripproto.sp_protocol = ip->ip_p;
72: ripdst.sin_addr = ip->ip_dst;
73: ripsrc.sin_addr = ip->ip_src;
74: if (raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
75: (struct sockaddr *)&ripdst) == 0) {
76: ipstat.ips_noproto++;
77: ipstat.ips_delivered--;
78: }
79: }
80:
81: /*
82: * Generate IP header and pass packet to ip_output.
83: * Tack on options user may have setup with control call.
84: */
85: #define satosin(sa) ((struct sockaddr_in *)(sa))
86: rip_output(m, so)
87: register struct mbuf *m;
88: struct socket *so;
89: {
90: register struct ip *ip;
91: register struct raw_inpcb *rp = sotorawinpcb(so);
92: register struct sockaddr_in *sin;
93:
94: /*
95: * If the user handed us a complete IP packet, use it.
96: * Otherwise, allocate an mbuf for a header and fill it in.
97: */
98: if (rp->rinp_flags & RINPF_HDRINCL)
99: ip = mtod(m, struct ip *);
100: else {
101: M_PREPEND(m, sizeof(struct ip), M_WAIT);
102: ip = mtod(m, struct ip *);
103: ip->ip_tos = 0;
104: ip->ip_off = 0;
105: ip->ip_p = rp->rinp_rcb.rcb_proto.sp_protocol;
106: ip->ip_len = m->m_pkthdr.len;
107: if (sin = satosin(rp->rinp_rcb.rcb_laddr)) {
108: ip->ip_src = sin->sin_addr;
109: } else
110: ip->ip_src.s_addr = 0;
111: if (sin = satosin(rp->rinp_rcb.rcb_faddr))
112: ip->ip_dst = sin->sin_addr;
113: ip->ip_ttl = MAXTTL;
114: }
115: return (ip_output(m,
116: (rp->rinp_flags & RINPF_HDRINCL)? (struct mbuf *)0: rp->rinp_options,
117: &rp->rinp_route,
118: (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
119: }
120:
121: /*
122: * Raw IP socket option processing.
123: */
124: rip_ctloutput(op, so, level, optname, m)
125: int op;
126: struct socket *so;
127: int level, optname;
128: struct mbuf **m;
129: {
130: int error = 0;
131: register struct raw_inpcb *rp = sotorawinpcb(so);
132:
133: if (level != IPPROTO_IP)
134: error = EINVAL;
135: else switch (op) {
136:
137: case PRCO_SETOPT:
138: switch (optname) {
139:
140: case IP_OPTIONS:
141: return (ip_pcbopts(&rp->rinp_options, *m));
142:
143: case IP_HDRINCL:
144: if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) {
145: error = EINVAL;
146: break;
147: }
148: if (*mtod(*m, int *))
149: rp->rinp_flags |= RINPF_HDRINCL;
150: else
151: rp->rinp_flags &= ~RINPF_HDRINCL;
152: break;
153:
154: default:
155: error = EINVAL;
156: break;
157: }
158: break;
159:
160: case PRCO_GETOPT:
161: *m = m_get(M_WAIT, MT_SOOPTS);
162: switch (optname) {
163:
164: case IP_OPTIONS:
165: if (rp->rinp_options) {
166: (*m)->m_len = rp->rinp_options->m_len;
167: bcopy(mtod(rp->rinp_options, caddr_t),
168: mtod(*m, caddr_t), (unsigned)(*m)->m_len);
169: } else
170: (*m)->m_len = 0;
171: break;
172:
173: case IP_HDRINCL:
174: (*m)->m_len = sizeof (int);
175: *mtod(*m, int *) = rp->rinp_flags & RINPF_HDRINCL;
176: break;
177:
178: default:
179: error = EINVAL;
180: m_freem(*m);
181: *m = 0;
182: break;
183: }
184: break;
185: }
186: if (op == PRCO_SETOPT && *m)
187: (void)m_free(*m);
188: return (error);
189: }
190:
191: /*ARGSUSED*/
192: rip_usrreq(so, req, m, nam, rights, control)
193: register struct socket *so;
194: int req;
195: struct mbuf *m, *nam, *rights, *control;
196: {
197: register int error = 0;
198: register struct raw_inpcb *rp = sotorawinpcb(so);
199:
200: switch (req) {
201:
202: case PRU_ATTACH:
203: if (rp)
204: panic("rip_attach");
205: MALLOC(rp, struct raw_inpcb *, sizeof *rp, M_PCB, M_WAITOK);
206: if (rp == 0)
207: return (ENOBUFS);
208: bzero((caddr_t)rp, sizeof *rp);
209: so->so_pcb = (caddr_t)rp;
210: break;
211:
212: case PRU_DETACH:
213: if (rp == 0)
214: panic("rip_detach");
215: if (rp->rinp_options)
216: m_freem(rp->rinp_options);
217: if (rp->rinp_route.ro_rt)
218: RTFREE(rp->rinp_route.ro_rt);
219: if (rp->rinp_rcb.rcb_laddr)
220: rp->rinp_rcb.rcb_laddr = 0;
221: break;
222:
223: case PRU_BIND:
224: {
225: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
226:
227: if (nam->m_len != sizeof(*addr))
228: return (EINVAL);
229: if ((ifnet == 0) ||
230: ((addr->sin_family != AF_INET) &&
231: (addr->sin_family != AF_IMPLINK)) ||
232: (addr->sin_addr.s_addr &&
233: ifa_ifwithaddr((struct sockaddr *)addr) == 0))
234: return (EADDRNOTAVAIL);
235: rp->rinp_rcb.rcb_laddr = (struct sockaddr *)&rp->rinp_laddr;
236: rp->rinp_laddr = *addr;
237: return (0);
238: }
239: case PRU_CONNECT:
240: {
241: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
242:
243: if (nam->m_len != sizeof(*addr))
244: return (EINVAL);
245: if (ifnet == 0)
246: return (EADDRNOTAVAIL);
247: if ((addr->sin_family != AF_INET) &&
248: (addr->sin_family != AF_IMPLINK))
249: return (EAFNOSUPPORT);
250: rp->rinp_rcb.rcb_faddr = (struct sockaddr *)&rp->rinp_faddr;
251: rp->rinp_faddr = *addr;
252: soisconnected(so);
253: return (0);
254: }
255: }
256: error = raw_usrreq(so, req, m, nam, control);
257:
258: if (error && (req == PRU_ATTACH) && so->so_pcb)
259: free(so->so_pcb, M_PCB);
260: return (error);
261: }
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