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>
70 #include <sys/malloc.h>
72 #include <sys/protosw.h>
73 #include <sys/socket.h>
74 #include <sys/socketvar.h>
75 #include <sys/sysctl.h>
76 #include <sys/errno.h>
78 #include <sys/systm.h>
79 #include <sys/syslog.h>
82 #include <net/route.h>
83 #include <net/if_types.h>
85 #include <netinet/in.h>
86 #include <netinet/in_var.h>
87 #include <netinet/in_systm.h>
88 #include <netinet/ip.h>
89 #include <netinet/ip_var.h>
90 #include <netinet/in_pcb.h>
91 #include <netinet/udp.h>
92 #include <netinet/udp_var.h>
93 #include <netinet/ip6.h>
94 #include <netinet6/ip6_var.h>
95 #include <netinet6/in6_pcb.h>
96 #include <netinet6/udp6_var.h>
97 #include <netinet/icmp6.h>
98 #include <netinet6/ip6protosw.h>
99 #include <netinet6/scope6_var.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 udpstat
117 #define udp6s_opackets udps_opackets
120 udp6_output(in6p, m, addr6, control, td)
123 struct mbuf *control;
124 struct sockaddr *addr6;
127 u_int32_t ulen = m->m_pkthdr.len;
128 u_int32_t plen = sizeof(struct udphdr) + ulen;
131 struct in6_addr *laddr, *faddr;
132 struct sockaddr_in6 *sin6 = NULL;
133 struct ifnet *oifp = NULL;
134 int scope_ambiguous = 0;
137 struct ip6_pktopts *optp, opt;
139 int af = AF_INET6, hlen = sizeof(struct ip6_hdr);
141 struct sockaddr_in6 tmp;
144 if (td && !suser(td))
148 /* addr6 has been validated in udp6_send(). */
149 sin6 = (struct sockaddr_in6 *)addr6;
151 /* protect *sin6 from overwrites */
156 * Application should provide a proper zone ID or the use of
157 * default zone IDs should be enabled. Unfortunately, some
158 * applications do not behave as it should, so we need a
159 * workaround. Even if an appropriate ID is not determined,
160 * we'll see if we can determine the outgoing interface. If we
161 * can, determine the zone ID based on the interface below.
163 if (sin6->sin6_scope_id == 0 && !ip6_use_defzone)
165 if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0)
170 if ((error = ip6_setpktopts(control, &opt,
171 in6p->in6p_outputopts, priv, IPPROTO_UDP)) != 0)
175 optp = in6p->in6p_outputopts;
178 faddr = &sin6->sin6_addr;
181 * IPv4 version of udp_output calls in_pcbconnect in this case,
182 * which needs splnet and affects performance.
183 * Since we saw no essential reason for calling in_pcbconnect,
184 * we get rid of such kind of logic, and call in6_selectsrc
185 * and in6_pcbsetport in order to fill in the local address
186 * and the local port.
188 if (sin6->sin6_port == 0) {
189 error = EADDRNOTAVAIL;
193 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
194 /* how about ::ffff:0.0.0.0 case? */
199 fport = sin6->sin6_port; /* allow 0 port */
201 if (IN6_IS_ADDR_V4MAPPED(faddr)) {
202 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
204 * I believe we should explicitly discard the
205 * packet when mapped addresses are disabled,
206 * rather than send the packet as an IPv6 one.
207 * If we chose the latter approach, the packet
208 * might be sent out on the wire based on the
209 * default route, the situation which we'd
210 * probably want to avoid.
211 * (20010421 jinmei@kame.net)
216 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
217 !IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) {
219 * when remote addr is an IPv4-mapped address,
220 * local addr should not be an IPv6 address,
221 * since you cannot determine how to map IPv6
222 * source address to IPv4.
231 if (!IN6_IS_ADDR_V4MAPPED(faddr)) {
232 laddr = in6_selectsrc(sin6, optp, in6p->in6p_moptions,
233 NULL, &in6p->in6p_laddr, &oifp, &error);
234 if (oifp && scope_ambiguous &&
235 (error = in6_setscope(&sin6->sin6_addr,
240 laddr = &in6p->in6p_laddr; /* XXX */
243 error = EADDRNOTAVAIL;
246 if (in6p->in6p_lport == 0 &&
247 (error = in6_pcbsetport(laddr, in6p, td->td_ucred)) != 0)
250 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
254 if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) {
255 if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY)) {
257 * XXX: this case would happen when the
258 * application sets the V6ONLY flag after
259 * connecting the foreign address.
260 * Such applications should be fixed,
263 log(LOG_INFO, "udp6_output: IPV6_V6ONLY "
264 "option was set for a connected socket\n");
270 laddr = &in6p->in6p_laddr;
271 faddr = &in6p->in6p_faddr;
272 fport = in6p->in6p_fport;
276 hlen = sizeof(struct ip);
279 * Calculate data length and get a mbuf
280 * for UDP and IP6 headers.
282 M_PREPEND(m, hlen + sizeof(struct udphdr), M_DONTWAIT);
289 * Stuff checksum and output datagram.
291 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
292 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
293 udp6->uh_dport = fport;
295 udp6->uh_ulen = htons((u_short)plen);
302 ip6 = mtod(m, struct ip6_hdr *);
303 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
304 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
305 ip6->ip6_vfc |= IPV6_VERSION;
306 #if 0 /* ip6_plen will be filled in ip6_output. */
307 ip6->ip6_plen = htons((u_short)plen);
309 ip6->ip6_nxt = IPPROTO_UDP;
310 ip6->ip6_hlim = in6_selecthlim(in6p, NULL);
311 ip6->ip6_src = *laddr;
312 ip6->ip6_dst = *faddr;
314 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
315 sizeof(struct ip6_hdr), plen)) == 0) {
316 udp6->uh_sum = 0xffff;
321 udp6stat.udp6s_opackets++;
322 error = ip6_output(m, optp, NULL, flags, in6p->in6p_moptions,
326 error = EAFNOSUPPORT;
336 ip6_clearpktopts(&opt, -1);