2 /* $KAME: ip_ecn.c,v 1.11 2001/05/03 16:09:29 itojun Exp $ */
5 * Copyright (C) 1999 WIDE Project.
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34 * ECN consideration on tunnel ingress/egress operation.
35 * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
39 #include "opt_inet6.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/errno.h>
46 #include <netinet/in.h>
47 #include <netinet/in_systm.h>
48 #include <netinet/ip.h>
50 #include <netinet/ip6.h>
53 #include <netinet/ip_ecn.h>
55 #include <netinet6/ip6_ecn.h>
59 * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
62 ip_ecn_ingress(mode, outer, inner)
65 const u_int8_t *inner;
68 panic("NULL pointer passed to ip_ecn_ingress");
72 case ECN_ALLOWED: /* ECN allowed */
75 case ECN_FORBIDDEN: /* ECN forbidden */
76 *outer &= ~(IPTOS_ECT | IPTOS_CE);
78 case ECN_NOCARE: /* no consideration to ECN */
84 * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
87 ip_ecn_egress(mode, outer, inner)
89 const u_int8_t *outer;
93 panic("NULL pointer passed to ip_ecn_egress");
97 if (*outer & IPTOS_CE)
100 case ECN_FORBIDDEN: /* ECN forbidden */
101 case ECN_NOCARE: /* no consideration to ECN */
108 ip6_ecn_ingress(mode, outer, inner)
111 const u_int32_t *inner;
113 u_int8_t outer8, inner8;
115 if (!outer || !inner)
116 panic("NULL pointer passed to ip6_ecn_ingress");
118 outer8 = (ntohl(*outer) >> 20) & 0xff;
119 inner8 = (ntohl(*inner) >> 20) & 0xff;
120 ip_ecn_ingress(mode, &outer8, &inner8);
121 *outer &= ~htonl(0xff << 20);
122 *outer |= htonl((u_int32_t)outer8 << 20);
126 ip6_ecn_egress(mode, outer, inner)
128 const u_int32_t *outer;
131 u_int8_t outer8, inner8;
133 if (!outer || !inner)
134 panic("NULL pointer passed to ip6_ecn_egress");
136 outer8 = (ntohl(*outer) >> 20) & 0xff;
137 inner8 = (ntohl(*inner) >> 20) & 0xff;
138 ip_ecn_egress(mode, &outer8, &inner8);
139 *inner &= ~htonl(0xff << 20);
140 *inner |= htonl((u_int32_t)inner8 << 20);