Annotation of sys/netinet6/udp6_output.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: udp6_output.c,v 1.14 2007/06/01 00:52:39 henning Exp $ */
2: /* $KAME: udp6_output.c,v 1.21 2001/02/07 11:51:54 itojun Exp $ */
3:
4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * Copyright (c) 1982, 1986, 1989, 1993
35: * The Regents of the University of California. All rights reserved.
36: *
37: * Redistribution and use in source and binary forms, with or without
38: * modification, are permitted provided that the following conditions
39: * are met:
40: * 1. Redistributions of source code must retain the above copyright
41: * notice, this list of conditions and the following disclaimer.
42: * 2. Redistributions in binary form must reproduce the above copyright
43: * notice, this list of conditions and the following disclaimer in the
44: * documentation and/or other materials provided with the distribution.
45: * 3. Neither the name of the University nor the names of its contributors
46: * may be used to endorse or promote products derived from this software
47: * without specific prior written permission.
48: *
49: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59: * SUCH DAMAGE.
60: *
61: * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
62: */
63:
64: #include <sys/param.h>
65: #include <sys/malloc.h>
66: #include <sys/mbuf.h>
67: #include <sys/protosw.h>
68: #include <sys/socket.h>
69: #include <sys/socketvar.h>
70: #include <sys/errno.h>
71: #include <sys/stat.h>
72: #include <sys/systm.h>
73: #include <sys/proc.h>
74: #include <sys/syslog.h>
75:
76: #include <net/if.h>
77: #include <net/route.h>
78: #include <net/if_types.h>
79:
80: #include <netinet/in.h>
81: #include <netinet/in_var.h>
82: #include <netinet/in_systm.h>
83: #include <netinet/ip.h>
84: #include <netinet/ip_var.h>
85: #include <netinet/in_pcb.h>
86: #include <netinet/udp.h>
87: #include <netinet/udp_var.h>
88: #include <netinet/ip6.h>
89: #include <netinet6/ip6_var.h>
90: #include <netinet/icmp6.h>
91: #include <netinet6/ip6protosw.h>
92:
93: #include "faith.h"
94:
95: /*
96: * UDP protocol inplementation.
97: * Per RFC 768, August, 1980.
98: */
99:
100: #define in6pcb inpcb
101: #define in6p_outputopts inp_outputopts6
102: #define in6p_socket inp_socket
103: #define in6p_faddr inp_faddr6
104: #define in6p_laddr inp_laddr6
105: #define in6p_fport inp_fport
106: #define in6p_lport inp_lport
107: #define in6p_flags inp_flags
108: #define in6p_moptions inp_moptions6
109: #define in6p_route inp_route6
110: #define in6p_flowinfo inp_flowinfo
111: #define udp6stat udpstat
112: #define udp6s_opackets udps_opackets
113:
114: int
115: udp6_output(in6p, m, addr6, control)
116: struct in6pcb *in6p;
117: struct mbuf *m;
118: struct mbuf *addr6, *control;
119: {
120: u_int32_t ulen = m->m_pkthdr.len;
121: u_int32_t plen = sizeof(struct udphdr) + ulen;
122: struct ip6_hdr *ip6;
123: struct udphdr *udp6;
124: struct in6_addr *laddr, *faddr;
125: u_short fport;
126: int error = 0;
127: struct ip6_pktopts *optp, opt;
128: int priv;
129: int af, hlen;
130: int flags;
131: struct sockaddr_in6 tmp;
132: struct proc *p = curproc; /* XXX */
133:
134: priv = 0;
135: if ((in6p->in6p_socket->so_state & SS_PRIV) != 0)
136: priv = 1;
137: if (control) {
138: if ((error = ip6_setpktopts(control, &opt,
139: in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0)
140: goto release;
141: optp = &opt;
142: } else
143: optp = in6p->in6p_outputopts;
144:
145: if (addr6) {
146: /*
147: * IPv4 version of udp_output calls in_pcbconnect in this case,
148: * which needs splnet and affects performance.
149: * Since we saw no essential reason for calling in_pcbconnect,
150: * we get rid of such kind of logic, and call in6_selectsrc
151: * and in6_pcbsetport in order to fill in the local address
152: * and the local port.
153: */
154: struct sockaddr_in6 *sin6 = mtod(addr6, struct sockaddr_in6 *);
155:
156: if (addr6->m_len != sizeof(*sin6)) {
157: error = EINVAL;
158: goto release;
159: }
160: if (sin6->sin6_family != AF_INET6) {
161: error = EAFNOSUPPORT;
162: goto release;
163: }
164: if (sin6->sin6_port == 0) {
165: error = EADDRNOTAVAIL;
166: goto release;
167: }
168:
169: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
170: error = EISCONN;
171: goto release;
172: }
173:
174: /* protect *sin6 from overwrites */
175: tmp = *sin6;
176: sin6 = &tmp;
177:
178: faddr = &sin6->sin6_addr;
179: fport = sin6->sin6_port; /* allow 0 port */
180:
181: /* KAME hack: embed scopeid */
182: if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
183: error = EINVAL;
184: goto release;
185: }
186:
187: if (1) /* we don't support IPv4 mapped address */
188: {
189: laddr = in6_selectsrc(sin6, optp,
190: in6p->in6p_moptions,
191: &in6p->in6p_route,
192: &in6p->in6p_laddr, &error);
193: } else
194: laddr = &in6p->in6p_laddr; /*XXX*/
195: if (laddr == NULL) {
196: if (error == 0)
197: error = EADDRNOTAVAIL;
198: goto release;
199: }
200: if (in6p->in6p_lport == 0 &&
201: (error = in6_pcbsetport(laddr, in6p, p)) != 0)
202: goto release;
203: } else {
204: if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
205: error = ENOTCONN;
206: goto release;
207: }
208: laddr = &in6p->in6p_laddr;
209: faddr = &in6p->in6p_faddr;
210: fport = in6p->in6p_fport;
211: }
212:
213: if (1) /* we don't support IPv4 mapped address */
214: {
215: af = AF_INET6;
216: hlen = sizeof(struct ip6_hdr);
217: } else {
218: af = AF_INET;
219: hlen = sizeof(struct ip);
220: }
221:
222: /*
223: * Calculate data length and get a mbuf
224: * for UDP and IP6 headers.
225: */
226: M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
227: if (m == 0) {
228: error = ENOBUFS;
229: goto release;
230: }
231:
232: /*
233: * Stuff checksum and output datagram.
234: */
235: udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
236: udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
237: udp6->uh_dport = fport;
238: if (plen <= 0xffff)
239: udp6->uh_ulen = htons((u_short)plen);
240: else
241: udp6->uh_ulen = 0;
242: udp6->uh_sum = 0;
243:
244: switch (af) {
245: case AF_INET6:
246: ip6 = mtod(m, struct ip6_hdr *);
247: ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
248: ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
249: ip6->ip6_vfc |= IPV6_VERSION;
250: #if 0 /* ip6_plen will be filled in ip6_output. */
251: ip6->ip6_plen = htons((u_short)plen);
252: #endif
253: ip6->ip6_nxt = IPPROTO_UDP;
254: ip6->ip6_hlim = in6_selecthlim(in6p,
255: in6p->in6p_route.ro_rt ?
256: in6p->in6p_route.ro_rt->rt_ifp : NULL);
257: ip6->ip6_src = *laddr;
258: ip6->ip6_dst = *faddr;
259:
260: if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
261: sizeof(struct ip6_hdr), plen)) == 0) {
262: udp6->uh_sum = 0xffff;
263: }
264:
265: flags = 0;
266: if (in6p->in6p_flags & IN6P_MINMTU)
267: flags |= IPV6_MINMTU;
268:
269: udp6stat.udp6s_opackets++;
270: error = ip6_output(m, optp, &in6p->in6p_route,
271: flags, in6p->in6p_moptions, NULL, in6p);
272: break;
273: case AF_INET:
274: error = EAFNOSUPPORT;
275: goto release;
276: }
277: goto releaseopt;
278:
279: release:
280: m_freem(m);
281:
282: releaseopt:
283: if (control) {
284: ip6_clearpktopts(&opt, -1);
285: m_freem(control);
286: }
287: return (error);
288: }
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