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
65 #include "opt_inet6.h"
67 #include <sys/param.h>
68 #include <sys/malloc.h>
70 #include <sys/protosw.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
73 #include <sys/sysctl.h>
74 #include <sys/errno.h>
76 #include <sys/systm.h>
79 #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>
101 #include <net/net_osdep.h>
104 * UDP protocol inplementation.
105 * Per RFC 768, August, 1980.
109 #define udp6stat udp_stat
110 #define udp6s_opackets udps_opackets
113 udp6_output(struct in6pcb *in6p, struct mbuf *m, struct sockaddr *addr6,
114 struct mbuf *control, struct thread *td)
116 u_int32_t ulen = m->m_pkthdr.len;
117 u_int32_t plen = sizeof(struct udphdr) + ulen;
120 struct in6_addr *laddr, *faddr;
123 struct ip6_pktopts opt, *stickyopt = in6p->in6p_outputopts;
125 int hlen = sizeof(struct ip6_hdr);
126 struct sockaddr_in6 tmp;
128 priv = !priv_check(td, PRIV_ROOT); /* 1 if privileged, 0 if not */
130 if ((error = ip6_setpktoptions(control, &opt,
131 in6p->in6p_outputopts,
132 IPPROTO_UDP, priv)) != 0)
134 in6p->in6p_outputopts = &opt;
139 * IPv4 version of udp_output calls in_pcbconnect in this case,
140 * which needs splnet and affects performance.
141 * Since we saw no essential reason for calling in_pcbconnect,
142 * we get rid of such kind of logic, and call in6_selectsrc
143 * and in6_pcbsetlport in order to fill in the local address
144 * and the local port.
146 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr6;
148 /* Caller should have rejected the v4-mapped address */
149 KASSERT(!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr),
150 ("v4-mapped address"));
152 if (sin6->sin6_port == 0) {
153 error = EADDRNOTAVAIL;
157 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
158 /* how about ::ffff:0.0.0.0 case? */
162 if (!prison_remote_ip(td, addr6)) {
163 error = EAFNOSUPPORT; /* IPv4 only jail */
167 /* protect *sin6 from overwrites */
171 faddr = &sin6->sin6_addr;
172 fport = sin6->sin6_port; /* allow 0 port */
174 /* KAME hack: embed scopeid */
175 if (in6_embedscope(&sin6->sin6_addr, sin6, in6p, NULL) != 0) {
180 laddr = in6_selectsrc(sin6, in6p->in6p_outputopts,
183 &in6p->in6p_laddr, &error, NULL);
186 error = EADDRNOTAVAIL;
189 if (in6p->in6p_lport == 0 &&
190 (error = in6_pcbsetlport(laddr, in6p, td)) != 0)
193 if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
198 /* Connection to v4-mapped address should have been rejected */
199 KASSERT(!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr),
200 ("bound to v4-mapped address"));
202 laddr = &in6p->in6p_laddr;
203 faddr = &in6p->in6p_faddr;
204 fport = in6p->in6p_fport;
208 * Calculate data length and get a mbuf
209 * for UDP and IP6 headers.
211 M_PREPEND(m, hlen + sizeof(struct udphdr), M_NOWAIT);
218 * Stuff checksum and output datagram.
220 udp6 = (struct udphdr *)(mtod(m, caddr_t) + hlen);
221 udp6->uh_sport = in6p->in6p_lport; /* lport is always set in the PCB */
222 udp6->uh_dport = fport;
224 udp6->uh_ulen = htons((u_short)plen);
229 ip6 = mtod(m, struct ip6_hdr *);
230 ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK;
231 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
232 ip6->ip6_vfc |= IPV6_VERSION;
233 #if 0 /* ip6_plen will be filled in ip6_output. */
234 ip6->ip6_plen = htons((u_short)plen);
236 ip6->ip6_nxt = IPPROTO_UDP;
237 ip6->ip6_hlim = in6_selecthlim(in6p,
238 in6p->in6p_route.ro_rt ?
239 in6p->in6p_route.ro_rt->rt_ifp : NULL);
240 ip6->ip6_src = *laddr;
241 ip6->ip6_dst = *faddr;
243 if ((udp6->uh_sum = in6_cksum(m, IPPROTO_UDP,
244 sizeof(struct ip6_hdr), plen)) == 0) {
245 udp6->uh_sum = 0xffff;
248 udp6stat.udp6s_opackets++;
249 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route, 0,
250 in6p->in6p_moptions, NULL, in6p);
258 ip6_clearpktopts(in6p->in6p_outputopts, -1);
259 in6p->in6p_outputopts = stickyopt;