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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61 * @(#)udp_var.h 8.1 (Berkeley) 6/10/93
64 #include "opt_ipsec.h"
66 #include "opt_inet6.h"
68 #include <sys/param.h>
69 #include <sys/malloc.h>
71 #include <sys/protosw.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/sysctl.h>
75 #include <sys/errno.h>
77 #include <sys/systm.h>
80 #include <sys/syslog.h>
83 #include <net/route.h>
84 #include <net/if_types.h>
86 #include <netinet/in.h>
87 #include <netinet/in_var.h>
88 #include <netinet/in_systm.h>
89 #include <netinet/ip.h>
90 #include <netinet/ip_var.h>
91 #include <netinet/in_pcb.h>
92 #include <netinet/udp.h>
93 #include <netinet/udp_var.h>
94 #include <netinet/ip6.h>
95 #include <netinet6/ip6_var.h>
96 #include <netinet6/in6_pcb.h>
97 #include <netinet6/udp6_var.h>
98 #include <netinet/icmp6.h>
99 #include <netinet6/ip6protosw.h>
102 #include <netinet6/ipsec.h>
104 #include <netinet6/ipsec6.h>
108 #include <net/net_osdep.h>
111 * UDP protocol inplementation.
112 * Per RFC 768, August, 1980.
116 #define udp6stat udp_stat
117 #define udp6s_opackets udps_opackets
120 udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6,
121 struct mbuf *control, struct thread *td)
123 u_int32_t ulen = m->m_pkthdr.len;
124 u_int32_t plen = sizeof(struct udphdr) + ulen;
127 struct in6_addr *laddr, *faddr;
130 struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
132 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
134 struct sockaddr_in6 tmp;
136 priv = !priv_check(td, PRIV_ROOT); /* 1 if privileged, 0 if not */
138 if ((error = ip6_setpktoptions(control, &opt,
139 in6p->in6p_outputopts,
140 IPPROTO_UDP, priv)) != 0)
142 in6p->in6p_outputopts = &opt;
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_pcbsetlport in order to fill in the local address
152 * and the local port.
154 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
155 if (sin6->sin6_port == 0) {
156 error = EADDRNOTAVAIL;
160 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
161 /* how about ::ffff:0.0.0.0 case? */
165 if (!prison_remote_ip(td, addr6)) {
166 error = EAFNOSUPPORT; /* IPv4 only jail */
170 /* protect *sin6 from overwrites */
174 faddr = &sin6->sin6_addr;
175 fport = sin6->sin6_port; /* allow 0 port */
177 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
178 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
180 * I believe we should explicitly discard the
181 * packet when mapped addresses are disabled,
182 * rather than send the packet as an IPv6 one.
183 * If we chose the latter approach, the packet
184 * might be sent out on the wire based on the
185 * default route, the situation which we'd
186 * probably want to avoid.
187 * (20010421 jinmei@kame.net)
195 /* KAME hack: embed scopeid */
196 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
201 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
202 laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
205 &in6p->in6p_laddr, &error, NULL);
207 laddr = &in6p->in6p_laddr; /* XXX */
210 error = EADDRNOTAVAIL;
213 if (in6p->in6p_lport == 0 &&
214 (error = in6_pcbsetlport(laddr, in6p, td)) != 0)
217 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
221 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
222 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
224 * XXX: this case would happen when the
225 * application sets the V6ONLY flag after
226 * connecting the foreign address.
227 * Such applications should be fixed,
230 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
231 "option was set for a connected socket\n");
237 laddr = &in6p->in6p_laddr;
238 faddr = &in6p->in6p_faddr;
239 fport = in6p->in6p_fport;
243 hlen = sizeof(struct ip);
246 * Calculate data length and get a mbuf
247 * for UDP and IP6 headers.
249 M_PREPEND(m, hlen + sizeof(struct udphdr), MB_DONTWAIT);
256 * Stuff checksum and output datagram.
258 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
259 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
260 udp6->uh_dport = fport;
262 udp6->uh_ulen = htons((u_short)plen);
269 ip6 = mtod(m, struct ip6_hdr *);
270 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
271 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
272 ip6->ip6_vfc |= IPV6_VERSION;
273 #if 0 /* ip6_plen will be filled in ip6_output. */
274 ip6->ip6_plen = htons((u_short)plen);
276 ip6->ip6_nxt = IPPROTO_UDP;
277 ip6->ip6_hlim = in6_selecthlim(in6p,
278 in6p->in6p_route.ro_rt ?
279 in6p->in6p_route.ro_rt->rt_ifp : NULL);
280 ip6->ip6_src = *laddr;
281 ip6->ip6_dst = *faddr;
283 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
284 sizeof(struct ip6_hdr), plen)) == 0) {
285 udp6->uh_sum = 0xffff;
290 udp6stat.udp6s_opackets++;
291 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route,
292 flags, in6p->in6p_moptions, NULL, in6p);
295 error = EAFNOSUPPORT;
305 ip6_clearpktopts(in6p->in6p_outputopts, -1);
306 in6p->in6p_outputopts = stickyopt;