Annotation of src/sys/netinet/raw_ip.c, Revision 1.5
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: *
1.3 cgd 33: * from: @(#)raw_ip.c 7.8 (Berkeley) 7/25/90
1.5 ! cgd 34: * $Id: raw_ip.c,v 1.4 1993/05/21 05:27:15 cgd Exp $
1.1 cgd 35: */
36:
37: #include "param.h"
38: #include "malloc.h"
39: #include "mbuf.h"
40: #include "socket.h"
41: #include "protosw.h"
42: #include "socketvar.h"
43: #include "errno.h"
44:
45: #include "../net/if.h"
46: #include "../net/route.h"
47: #include "../net/raw_cb.h"
48:
49: #include "in.h"
50: #include "in_systm.h"
51: #include "ip.h"
52: #include "ip_var.h"
53: #include "in_pcb.h"
54:
55: /*
56: * Raw interface to IP protocol.
57: */
58:
59: struct sockaddr_in ripdst = { sizeof(ripdst), AF_INET };
60: struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
61: struct sockproto ripproto = { PF_INET };
62: /*
63: * Setup generic address and protocol structures
64: * for raw_input routine, then pass them along with
65: * mbuf chain.
66: */
67: rip_input(m)
68: struct mbuf *m;
69: {
70: register struct ip *ip = mtod(m, struct ip *);
71:
72: ripproto.sp_protocol = ip->ip_p;
73: ripdst.sin_addr = ip->ip_dst;
74: ripsrc.sin_addr = ip->ip_src;
75: if (raw_input(m, &ripproto, (struct sockaddr *)&ripsrc,
76: (struct sockaddr *)&ripdst) == 0) {
77: ipstat.ips_noproto++;
78: ipstat.ips_delivered--;
79: }
80: }
81:
82: /*
83: * Generate IP header and pass packet to ip_output.
84: * Tack on options user may have setup with control call.
85: */
86: #define satosin(sa) ((struct sockaddr_in *)(sa))
87: rip_output(m, so)
88: register struct mbuf *m;
89: struct socket *so;
90: {
91: register struct ip *ip;
92: register struct raw_inpcb *rp = sotorawinpcb(so);
93: register struct sockaddr_in *sin;
94:
95: /*
96: * If the user handed us a complete IP packet, use it.
97: * Otherwise, allocate an mbuf for a header and fill it in.
98: */
1.4 cgd 99: if (rp->rinp_flags & RINPF_HDRINCL) {
1.1 cgd 100: ip = mtod(m, struct ip *);
1.4 cgd 101: if (ip->ip_len > m->m_pkthdr.len)
102: return EMSGSIZE;
103: ip->ip_len = m->m_pkthdr.len;
104: } else {
1.1 cgd 105: M_PREPEND(m, sizeof(struct ip), M_WAIT);
106: ip = mtod(m, struct ip *);
107: ip->ip_tos = 0;
108: ip->ip_off = 0;
109: ip->ip_p = rp->rinp_rcb.rcb_proto.sp_protocol;
110: ip->ip_len = m->m_pkthdr.len;
111: if (sin = satosin(rp->rinp_rcb.rcb_laddr)) {
112: ip->ip_src = sin->sin_addr;
113: } else
114: ip->ip_src.s_addr = 0;
115: if (sin = satosin(rp->rinp_rcb.rcb_faddr))
116: ip->ip_dst = sin->sin_addr;
117: ip->ip_ttl = MAXTTL;
118: }
119: return (ip_output(m,
120: (rp->rinp_flags & RINPF_HDRINCL)? (struct mbuf *)0: rp->rinp_options,
121: &rp->rinp_route,
122: (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST));
123: }
124:
125: /*
126: * Raw IP socket option processing.
127: */
128: rip_ctloutput(op, so, level, optname, m)
129: int op;
130: struct socket *so;
131: int level, optname;
132: struct mbuf **m;
133: {
134: int error = 0;
135: register struct raw_inpcb *rp = sotorawinpcb(so);
136:
137: if (level != IPPROTO_IP)
138: error = EINVAL;
139: else switch (op) {
140:
141: case PRCO_SETOPT:
142: switch (optname) {
143:
144: case IP_OPTIONS:
145: return (ip_pcbopts(&rp->rinp_options, *m));
146:
147: case IP_HDRINCL:
148: if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) {
149: error = EINVAL;
150: break;
151: }
152: if (*mtod(*m, int *))
153: rp->rinp_flags |= RINPF_HDRINCL;
154: else
155: rp->rinp_flags &= ~RINPF_HDRINCL;
156: break;
157:
158: default:
159: error = EINVAL;
160: break;
161: }
162: break;
163:
164: case PRCO_GETOPT:
165: *m = m_get(M_WAIT, MT_SOOPTS);
166: switch (optname) {
167:
168: case IP_OPTIONS:
169: if (rp->rinp_options) {
170: (*m)->m_len = rp->rinp_options->m_len;
171: bcopy(mtod(rp->rinp_options, caddr_t),
172: mtod(*m, caddr_t), (unsigned)(*m)->m_len);
173: } else
174: (*m)->m_len = 0;
175: break;
176:
177: case IP_HDRINCL:
178: (*m)->m_len = sizeof (int);
179: *mtod(*m, int *) = rp->rinp_flags & RINPF_HDRINCL;
180: break;
181:
182: default:
183: error = EINVAL;
184: m_freem(*m);
185: *m = 0;
186: break;
187: }
188: break;
189: }
190: if (op == PRCO_SETOPT && *m)
191: (void)m_free(*m);
192: return (error);
193: }
194:
195: /*ARGSUSED*/
1.2 cgd 196: rip_usrreq(so, req, m, nam, control)
1.1 cgd 197: register struct socket *so;
198: int req;
1.2 cgd 199: struct mbuf *m, *nam, *control;
1.1 cgd 200: {
201: register int error = 0;
202: register struct raw_inpcb *rp = sotorawinpcb(so);
203:
204: switch (req) {
205:
206: case PRU_ATTACH:
207: if (rp)
208: panic("rip_attach");
209: MALLOC(rp, struct raw_inpcb *, sizeof *rp, M_PCB, M_WAITOK);
210: if (rp == 0)
211: return (ENOBUFS);
212: bzero((caddr_t)rp, sizeof *rp);
213: so->so_pcb = (caddr_t)rp;
214: break;
215:
216: case PRU_DETACH:
217: if (rp == 0)
218: panic("rip_detach");
219: if (rp->rinp_options)
220: m_freem(rp->rinp_options);
221: if (rp->rinp_route.ro_rt)
222: RTFREE(rp->rinp_route.ro_rt);
223: if (rp->rinp_rcb.rcb_laddr)
224: rp->rinp_rcb.rcb_laddr = 0;
225: break;
226:
227: case PRU_BIND:
228: {
229: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
230:
231: if (nam->m_len != sizeof(*addr))
232: return (EINVAL);
233: if ((ifnet == 0) ||
234: ((addr->sin_family != AF_INET) &&
235: (addr->sin_family != AF_IMPLINK)) ||
236: (addr->sin_addr.s_addr &&
237: ifa_ifwithaddr((struct sockaddr *)addr) == 0))
238: return (EADDRNOTAVAIL);
239: rp->rinp_rcb.rcb_laddr = (struct sockaddr *)&rp->rinp_laddr;
240: rp->rinp_laddr = *addr;
241: return (0);
242: }
243: case PRU_CONNECT:
244: {
245: struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
246:
247: if (nam->m_len != sizeof(*addr))
248: return (EINVAL);
249: if (ifnet == 0)
250: return (EADDRNOTAVAIL);
251: if ((addr->sin_family != AF_INET) &&
252: (addr->sin_family != AF_IMPLINK))
253: return (EAFNOSUPPORT);
254: rp->rinp_rcb.rcb_faddr = (struct sockaddr *)&rp->rinp_faddr;
255: rp->rinp_faddr = *addr;
256: soisconnected(so);
257: return (0);
258: }
259: }
260: error = raw_usrreq(so, req, m, nam, control);
261:
262: if (error && (req == PRU_ATTACH) && so->so_pcb)
263: free(so->so_pcb, M_PCB);
264: return (error);
265: }
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