Support IPv6 NAT-T. Implemented by hsuenaga@IIJ and ohishi@IIJ.
Add ATF later.
This commit is contained in:
knakahara
parent
415ab74c4d
commit
890dda538a
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@ -1,4 +1,4 @@
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/* $NetBSD: udp_usrreq.c,v 1.256 2018/09/14 05:09:51 maxv Exp $ */
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/* $NetBSD: udp_usrreq.c,v 1.257 2018/11/22 04:48:34 knakahara Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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@ -66,7 +66,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.256 2018/09/14 05:09:51 maxv Exp $");
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__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.257 2018/11/22 04:48:34 knakahara Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_inet.h"
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@ -413,7 +413,7 @@ udp_input(struct mbuf *m, int off, int proto)
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in6_in_2_v4mapin6(&ip->ip_dst, &dst6.sin6_addr);
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dst6.sin6_port = uh->uh_dport;
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n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen);
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n += udp6_realinput(AF_INET, &src6, &dst6, &m, iphlen);
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}
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#endif
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@ -1,4 +1,4 @@
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/* $NetBSD: in6_pcb.h,v 1.49 2017/03/02 05:26:24 ozaki-r Exp $ */
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/* $NetBSD: in6_pcb.h,v 1.50 2018/11/22 04:48:34 knakahara Exp $ */
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/* $KAME: in6_pcb.h,v 1.45 2001/02/09 05:59:46 itojun Exp $ */
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/*
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@ -137,6 +137,8 @@ struct in6pcb {
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#define IN6P_LOWPORT 0x2000000 /* user wants "low" port binding */
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#define IN6P_ANONPORT 0x4000000 /* port chosen for user */
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#define IN6P_FAITH 0x8000000 /* accept FAITH'ed connections */
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/* XXX should move to an UDP control block */
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#define IN6P_ESPINUDP INP_ESPINUDP /* ESP over UDP for NAT-T */
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#define IN6P_RFC2292 0x40000000 /* RFC2292 */
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#define IN6P_MTU 0x80000000 /* use minimum MTU */
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@ -1,4 +1,4 @@
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/* $NetBSD: udp6_usrreq.c,v 1.143 2018/11/06 04:27:41 ozaki-r Exp $ */
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/* $NetBSD: udp6_usrreq.c,v 1.144 2018/11/22 04:48:34 knakahara Exp $ */
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/* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun Exp $ */
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/* $KAME: udp6_output.c,v 1.43 2001/10/15 09:19:52 itojun Exp $ */
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@ -63,7 +63,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.143 2018/11/06 04:27:41 ozaki-r Exp $");
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__KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.144 2018/11/22 04:48:34 knakahara Exp $");
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#ifdef _KERNEL_OPT
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#include "opt_inet.h"
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@ -109,6 +109,7 @@ __KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.143 2018/11/06 04:27:41 ozaki-r Ex
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#ifdef IPSEC
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#include <netipsec/ipsec.h>
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#include <netipsec/esp.h>
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#ifdef INET6
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#include <netipsec/ipsec6.h>
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#endif
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@ -135,6 +136,10 @@ static int udp6_recvspace = 40 * (1024 + sizeof(struct sockaddr_in6));
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static void udp6_notify(struct in6pcb *, int);
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static void sysctl_net_inet6_udp6_setup(struct sysctllog **);
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#ifdef IPSEC
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static int udp6_espinudp(struct mbuf **, int, struct sockaddr *,
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struct socket *);
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#endif
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#ifdef UDP_CSUM_COUNTERS
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#include <sys/device.h>
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@ -298,7 +303,9 @@ udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
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{
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int s;
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int error = 0;
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struct in6pcb *in6p;
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int family;
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int optval;
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family = so->so_proto->pr_domain->dom_family;
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@ -324,7 +331,42 @@ udp6_ctloutput(int op, struct socket *so, struct sockopt *sopt)
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error = EAFNOSUPPORT;
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goto end;
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}
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error = EINVAL;
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switch (op) {
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case PRCO_SETOPT:
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in6p = sotoin6pcb(so);
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switch (sopt->sopt_name) {
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case UDP_ENCAP:
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error = sockopt_getint(sopt, &optval);
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if (error)
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break;
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switch(optval) {
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case 0:
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in6p->in6p_flags &= ~IN6P_ESPINUDP;
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break;
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case UDP_ENCAP_ESPINUDP:
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in6p->in6p_flags |= IN6P_ESPINUDP;
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break;
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default:
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error = EINVAL;
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break;
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}
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break;
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default:
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error = ENOPROTOOPT;
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break;
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}
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break;
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default:
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error = EINVAL;
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break;
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}
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end:
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splx(s);
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@ -374,7 +416,7 @@ udp6_sendup(struct mbuf *m, int off /* offset of data portion */,
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int
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udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst,
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struct mbuf *m, int off)
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struct mbuf **mp, int off)
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{
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u_int16_t sport, dport;
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int rcvcnt;
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const struct in_addr *dst4;
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struct inpcb_hdr *inph;
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struct in6pcb *in6p;
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struct mbuf *m = *mp;
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rcvcnt = 0;
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off += sizeof(struct udphdr); /* now, offset of payload */
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return rcvcnt;
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}
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#ifdef IPSEC
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/* Handle ESP over UDP */
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if (in6p->in6p_flags & IN6P_ESPINUDP) {
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struct sockaddr *sa = (struct sockaddr *)src;
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switch (udp6_espinudp(mp, off, sa, in6p->in6p_socket)) {
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case -1: /* Error, m was freed */
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rcvcnt = -1;
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goto bad;
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case 1: /* ESP over UDP */
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rcvcnt++;
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goto bad;
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case 0: /* plain UDP */
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default: /* Unexpected */
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/*
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* Normal UDP processing will take place,
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* m may have changed.
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*/
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m = *mp;
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break;
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}
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}
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#endif
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udp6_sendup(m, off, sin6tosa(src), in6p->in6p_socket);
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rcvcnt++;
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}
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@ -624,7 +693,7 @@ udp6_input(struct mbuf **mp, int *offp, int proto)
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dst.sin6_addr = ip6->ip6_dst;
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dst.sin6_port = uh->uh_dport;
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if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) {
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if (udp6_realinput(AF_INET6, &src, &dst, &m, off) == 0) {
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if (m->m_flags & M_MCAST) {
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UDP6_STATINC(UDP6_STAT_NOPORTMCAST);
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goto bad;
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@ -1308,6 +1377,121 @@ udp6_statinc(u_int stat)
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UDP6_STATINC(stat);
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}
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#ifdef IPSEC
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/*
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* Returns:
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* 1 if the packet was processed
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* 0 if normal UDP processing should take place
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* -1 if an error occurred and m was freed
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*/
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static int
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udp6_espinudp(struct mbuf **mp, int off, struct sockaddr *src,
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struct socket *so)
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{
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const size_t skip = sizeof(struct udphdr);
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size_t len;
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void *data;
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size_t minlen;
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int ip6hdrlen;
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struct ip6_hdr *ip6;
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struct m_tag *tag;
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struct udphdr *udphdr;
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u_int16_t sport, dport;
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struct mbuf *m = *mp;
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uint32_t *marker;
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/*
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* Collapse the mbuf chain if the first mbuf is too short
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* The longest case is: UDP + non ESP marker + ESP
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*/
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minlen = off + sizeof(u_int64_t) + sizeof(struct esp);
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if (minlen > m->m_pkthdr.len)
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minlen = m->m_pkthdr.len;
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if (m->m_len < minlen) {
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if ((*mp = m_pullup(m, minlen)) == NULL) {
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return -1;
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}
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m = *mp;
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}
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len = m->m_len - off;
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data = mtod(m, char *) + off;
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/* Ignore keepalive packets */
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if ((len == 1) && (*(unsigned char *)data == 0xff)) {
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m_freem(m);
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*mp = NULL; /* avoid any further processing by caller ... */
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return 1;
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}
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/* Handle Non-ESP marker (32bit). If zero, then IKE. */
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marker = (uint32_t *)data;
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if (len <= sizeof(uint32_t))
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return 0;
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if (marker[0] == 0)
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return 0;
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/*
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* Get the UDP ports. They are handled in network
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* order everywhere in IPSEC_NAT_T code.
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*/
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udphdr = (struct udphdr *)((char *)data - skip);
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sport = udphdr->uh_sport;
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dport = udphdr->uh_dport;
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/*
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* Remove the UDP header (and possibly the non ESP marker)
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* IPv6 header length is ip6hdrlen
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* Before:
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* <---- off --->
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* +-----+------+-----+
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* | IP6 | UDP | ESP |
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* +-----+------+-----+
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* <-skip->
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* After:
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* +-----+-----+
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* | IP6 | ESP |
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* +-----+-----+
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* <-skip->
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*/
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ip6hdrlen = off - sizeof(struct udphdr);
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memmove(mtod(m, char *) + skip, mtod(m, void *), ip6hdrlen);
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m_adj(m, skip);
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ip6 = mtod(m, struct ip6_hdr *);
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ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - skip);
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ip6->ip6_nxt = IPPROTO_ESP;
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/*
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* We have modified the packet - it is now ESP, so we should not
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* return to UDP processing ...
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*
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* Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember
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* the source UDP port. This is required if we want
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* to select the right SPD for multiple hosts behind
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* same NAT
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*/
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if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS,
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sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) {
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m_freem(m);
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return -1;
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}
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((u_int16_t *)(tag + 1))[0] = sport;
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((u_int16_t *)(tag + 1))[1] = dport;
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m_tag_prepend(m, tag);
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if (ipsec_used)
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ipsec6_common_input(&m, &ip6hdrlen, IPPROTO_ESP);
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else
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m_freem(m);
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/* We handled it, it shouldn't be handled by UDP */
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*mp = NULL; /* avoid free by caller ... */
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return 1;
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}
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#endif /* IPSEC */
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PR_WRAP_USRREQS(udp6)
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#define udp6_attach udp6_attach_wrapper
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#define udp6_detach udp6_detach_wrapper
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@ -1,4 +1,4 @@
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/* $NetBSD: udp6_var.h,v 1.29 2018/08/22 01:05:24 msaitoh Exp $ */
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/* $NetBSD: udp6_var.h,v 1.30 2018/11/22 04:48:34 knakahara Exp $ */
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/* $KAME: udp6_var.h,v 1.11 2000/06/05 00:14:31 itojun Exp $ */
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/*
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@ -103,7 +103,7 @@ int udp6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
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int udp6_usrreq(struct socket *, int, struct mbuf *, struct mbuf *,
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struct mbuf *, struct lwp *);
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int udp6_realinput(int, struct sockaddr_in6 *, struct sockaddr_in6 *,
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struct mbuf *, int);
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struct mbuf **, int);
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int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, int);
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void udp6_statinc(u_int);
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@ -1,4 +1,4 @@
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/* $NetBSD: ipsec.c,v 1.166 2018/10/27 05:42:23 maxv Exp $ */
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/* $NetBSD: ipsec.c,v 1.167 2018/11/22 04:48:34 knakahara Exp $ */
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/* $FreeBSD: ipsec.c,v 1.2.2.2 2003/07/01 01:38:13 sam Exp $ */
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/* $KAME: ipsec.c,v 1.103 2001/05/24 07:14:18 sakane Exp $ */
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@ -32,7 +32,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.166 2018/10/27 05:42:23 maxv Exp $");
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__KERNEL_RCSID(0, "$NetBSD: ipsec.c,v 1.167 2018/11/22 04:48:34 knakahara Exp $");
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/*
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* IPsec controller part.
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@ -1830,6 +1830,42 @@ skippolicycheck:
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*needipsecp = needipsec;
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return sp;
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}
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/*
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* calculate UDP checksum for UDP encapsulated ESP for IPv6.
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*
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* RFC2460(Internet Protocol, Version 6 Specification) says:
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*
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* IPv6 receivers MUST discard UDP packets with a zero checksum.
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*
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* There is more relaxed speficication RFC6935(IPv6 and UDP Checksums for
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* Tunneled Packets). The document allows zero checksum. It's too
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* late to publish, there are a lot of interoperability problems...
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*/
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void
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ipsec6_udp_cksum(struct mbuf *m)
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{
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struct ip6_hdr *ip6;
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uint16_t plen, uh_sum;
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int off;
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/* must called after m_pullup() */
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KASSERT(m->m_len >= sizeof(struct ip6_hdr));
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ip6 = mtod(m, struct ip6_hdr *);
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KASSERT(ip6->ip6_nxt == IPPROTO_UDP);
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/* ip6->ip6_plen can not be updated before ip6_output() */
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plen = m->m_pkthdr.len - sizeof(*ip6);
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KASSERT(plen >= sizeof(struct udphdr));
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uh_sum = in6_cksum(m, IPPROTO_UDP, sizeof(*ip6), plen);
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if (uh_sum == 0)
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uh_sum = 0xffff;
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off = sizeof(*ip6) + offsetof(struct udphdr, uh_sum);
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m_copyback(m, off, sizeof(uh_sum), (void *)&uh_sum);
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}
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#endif /* INET6 */
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/*
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|
|
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@ -1,4 +1,4 @@
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/* $NetBSD: ipsec.h,v 1.85 2018/11/15 10:23:56 maxv Exp $ */
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/* $NetBSD: ipsec.h,v 1.86 2018/11/22 04:48:34 knakahara Exp $ */
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/* $FreeBSD: ipsec.h,v 1.2.4.2 2004/02/14 22:23:23 bms Exp $ */
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/* $KAME: ipsec.h,v 1.53 2001/11/20 08:32:38 itojun Exp $ */
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@ -259,6 +259,9 @@ int ipsec4_output(struct mbuf *, struct inpcb *, int, u_long *, bool *, bool *);
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int ipsec_ip_input(struct mbuf *, bool);
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void ipsec_mtu(struct mbuf *, int *);
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#ifdef INET6
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void ipsec6_udp_cksum(struct mbuf *);
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#endif
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struct inpcb;
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int ipsec_init_pcbpolicy(struct socket *so, struct inpcbpolicy **);
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|
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@ -1,4 +1,4 @@
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/* $NetBSD: ipsec_output.c,v 1.80 2018/05/31 15:06:45 maxv Exp $ */
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/* $NetBSD: ipsec_output.c,v 1.81 2018/11/22 04:48:34 knakahara Exp $ */
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/*
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* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
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@ -29,7 +29,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ipsec_output.c,v 1.80 2018/05/31 15:06:45 maxv Exp $");
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__KERNEL_RCSID(0, "$NetBSD: ipsec_output.c,v 1.81 2018/11/22 04:48:34 knakahara Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_inet.h"
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|
@ -151,7 +151,7 @@ ipsec_process_done(struct mbuf *m, const struct ipsecrequest *isr,
|
|||
#endif
|
||||
struct mbuf *mo;
|
||||
struct udphdr *udp = NULL;
|
||||
int hlen, roff;
|
||||
int hlen, roff, iphlen;
|
||||
|
||||
KASSERT(m != NULL);
|
||||
KASSERT(isr != NULL);
|
||||
|
|
@ -160,11 +160,30 @@ ipsec_process_done(struct mbuf *m, const struct ipsecrequest *isr,
|
|||
saidx = &sav->sah->saidx;
|
||||
|
||||
if (sav->natt_type != 0) {
|
||||
ip = mtod(m, struct ip *);
|
||||
|
||||
hlen = sizeof(struct udphdr);
|
||||
|
||||
mo = m_makespace(m, sizeof(struct ip), hlen, &roff);
|
||||
switch (saidx->dst.sa.sa_family) {
|
||||
#ifdef INET
|
||||
case AF_INET:
|
||||
ip = mtod(m, struct ip *);
|
||||
mo = m_makespace(m, sizeof(struct ip), hlen, &roff);
|
||||
iphlen = ip->ip_hl << 2;
|
||||
break;
|
||||
#endif
|
||||
#ifdef INET6
|
||||
case AF_INET6:
|
||||
ip6 = mtod(m, struct ip6_hdr *);
|
||||
mo = m_makespace(m, sizeof(struct ip6_hdr), hlen, &roff);
|
||||
iphlen = sizeof(*ip6);
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
IPSECLOG(LOG_DEBUG, "unknown protocol family %u\n",
|
||||
saidx->dst.sa.sa_family);
|
||||
error = ENXIO;
|
||||
goto bad;
|
||||
}
|
||||
|
||||
if (mo == NULL) {
|
||||
char buf[IPSEC_ADDRSTRLEN];
|
||||
IPSECLOG(LOG_DEBUG,
|
||||
|
|
@ -179,7 +198,7 @@ ipsec_process_done(struct mbuf *m, const struct ipsecrequest *isr,
|
|||
udp->uh_sport = key_portfromsaddr(&saidx->src);
|
||||
udp->uh_dport = key_portfromsaddr(&saidx->dst);
|
||||
udp->uh_sum = 0;
|
||||
udp->uh_ulen = htons(m->m_pkthdr.len - (ip->ip_hl << 2));
|
||||
udp->uh_ulen = htons(m->m_pkthdr.len - iphlen);
|
||||
}
|
||||
|
||||
/*
|
||||
|
|
@ -190,6 +209,7 @@ ipsec_process_done(struct mbuf *m, const struct ipsecrequest *isr,
|
|||
case AF_INET:
|
||||
ip = mtod(m, struct ip *);
|
||||
ip->ip_len = htons(m->m_pkthdr.len);
|
||||
/* IPv4 packet does not have to be set UDP checksum. */
|
||||
if (sav->natt_type != 0)
|
||||
ip->ip_p = IPPROTO_UDP;
|
||||
break;
|
||||
|
|
@ -207,8 +227,11 @@ ipsec_process_done(struct mbuf *m, const struct ipsecrequest *isr,
|
|||
}
|
||||
ip6 = mtod(m, struct ip6_hdr *);
|
||||
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
||||
if (sav->natt_type != 0)
|
||||
/* IPv6 packet should be set UDP checksum. */
|
||||
if (sav->natt_type != 0) {
|
||||
ip6->ip6_nxt = IPPROTO_UDP;
|
||||
ipsec6_udp_cksum(m);
|
||||
}
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
|
|
|
|||
Loading…
Reference in New Issue