1 /* $FreeBSD: src/sys/netinet6/udp6_output.c,v 1.1.2.6 2003/01/23 21:06:47 sam Exp $ */
2 /* $KAME: udp6_output.c,v 1.31 2001/05/21 16:39:15 jinmei Exp $ */
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59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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65 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
68 #include "opt_ipsec.h"
70 #include "opt_inet6.h"
72 #include <sys/param.h>
73 #include <sys/malloc.h>
75 #include <sys/protosw.h>
76 #include <sys/socket.h>
77 #include <sys/socketvar.h>
78 #include <sys/sysctl.h>
79 #include <sys/errno.h>
81 #include <sys/systm.h>
84 #include <sys/syslog.h>
87 #include <net/route.h>
88 #include <net/if_types.h>
90 #include <netinet/in.h>
91 #include <netinet/in_var.h>
92 #include <netinet/in_systm.h>
93 #include <netinet/ip.h>
94 #include <netinet/ip_var.h>
95 #include <netinet/in_pcb.h>
96 #include <netinet/udp.h>
97 #include <netinet/udp_var.h>
98 #include <netinet/ip6.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/in6_pcb.h>
101 #include <netinet6/udp6_var.h>
102 #include <netinet/icmp6.h>
103 #include <netinet6/ip6protosw.h>
106 #include <netinet6/ipsec.h>
108 #include <netinet6/ipsec6.h>
112 #include <net/net_osdep.h>
115 * UDP protocol inplementation.
116 * Per RFC 768, August, 1980.
120 #define udp6stat udpstat
121 #define udp6s_opackets udps_opackets
124 udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6,
125 struct mbuf *control, struct thread *td)
127 u_int32_t ulen = m->m_pkthdr.len;
128 u_int32_t plen = sizeof(struct udphdr) + ulen;
131 struct in6_addr *laddr, *faddr;
134 struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
136 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
138 struct sockaddr_in6 tmp;
140 priv = !priv_check(td, PRIV_ROOT); /* 1 if privileged, 0 if not */
142 if ((error = ip6_setpktoptions(control, &opt,
143 in6p->in6p_outputopts,
144 IPPROTO_UDP, priv)) != 0)
146 in6p->in6p_outputopts = &opt;
151 * IPv4 version of udp_output calls in_pcbconnect in this case,
152 * which needs splnet and affects performance.
153 * Since we saw no essential reason for calling in_pcbconnect,
154 * we get rid of such kind of logic, and call in6_selectsrc
155 * and in6_pcbsetport in order to fill in the local address
156 * and the local port.
158 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
159 if (sin6->sin6_port == 0) {
160 error = EADDRNOTAVAIL;
164 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
165 /* how about ::ffff:0.0.0.0 case? */
169 if (!prison_remote_ip(td, addr6)) {
170 error = EAFNOSUPPORT; /* IPv4 only jail */
174 /* protect *sin6 from overwrites */
178 faddr = &sin6->sin6_addr;
179 fport = sin6->sin6_port; /* allow 0 port */
181 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
182 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
184 * I believe we should explicitly discard the
185 * packet when mapped addresses are disabled,
186 * rather than send the packet as an IPv6 one.
187 * If we chose the latter approach, the packet
188 * might be sent out on the wire based on the
189 * default route, the situation which we'd
190 * probably want to avoid.
191 * (20010421 jinmei@kame.net)
199 /* KAME hack: embed scopeid */
200 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
205 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
206 laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
209 &in6p->in6p_laddr, &error, NULL);
211 laddr = &in6p->in6p_laddr; /* XXX */
214 error = EADDRNOTAVAIL;
217 if (in6p->in6p_lport == 0 &&
218 (error = in6_pcbsetport(laddr, in6p, td)) != 0)
221 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
225 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
226 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
228 * XXX: this case would happen when the
229 * application sets the V6ONLY flag after
230 * connecting the foreign address.
231 * Such applications should be fixed,
234 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
235 "option was set for a connected socket\n");
241 laddr = &in6p->in6p_laddr;
242 faddr = &in6p->in6p_faddr;
243 fport = in6p->in6p_fport;
247 hlen = sizeof(struct ip);
250 * Calculate data length and get a mbuf
251 * for UDP and IP6 headers.
253 M_PREPEND(m, hlen + sizeof(struct udphdr), MB_DONTWAIT);
260 * Stuff checksum and output datagram.
262 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
263 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
264 udp6->uh_dport = fport;
266 udp6->uh_ulen = htons((u_short)plen);
273 ip6 = mtod(m, struct ip6_hdr *);
274 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
275 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
276 ip6->ip6_vfc |= IPV6_VERSION;
277 #if 0 /* ip6_plen will be filled in ip6_output. */
278 ip6->ip6_plen = htons((u_short)plen);
280 ip6->ip6_nxt = IPPROTO_UDP;
281 ip6->ip6_hlim = in6_selecthlim(in6p,
282 in6p->in6p_route.ro_rt ?
283 in6p->in6p_route.ro_rt->rt_ifp : NULL);
284 ip6->ip6_src = *laddr;
285 ip6->ip6_dst = *faddr;
287 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
288 sizeof(struct ip6_hdr), plen)) == 0) {
289 udp6->uh_sum = 0xffff;
294 udp6stat.udp6s_opackets++;
295 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
296 flags, in6p->in6p_moptions, NULL, in6p);
299 error = EAFNOSUPPORT;
309 ip6_clearpktopts(in6p->in6p_outputopts, -1);
310 in6p->in6p_outputopts = stickyopt;