FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_ecn.c
1 /* $NetBSD: ip_ecn.c,v 1.12 2002/04/10 09:18:57 itojun Exp $ */
2 /* $KAME: ip_ecn.c,v 1.11 2001/05/03 16:09:29 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1999 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33 /*
34 * ECN consideration on tunnel ingress/egress operation.
35 * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt
36 */
37
38 #include <sys/cdefs.h>
39 __KERNEL_RCSID(0, "$NetBSD: ip_ecn.c,v 1.12 2002/04/10 09:18:57 itojun Exp $");
40
41 #include "opt_inet.h"
42
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/malloc.h>
46 #include <sys/mbuf.h>
47 #include <sys/errno.h>
48
49 #include <netinet/in.h>
50 #include <netinet/in_systm.h>
51 #include <netinet/ip.h>
52 #ifdef INET6
53 #include <netinet/ip6.h>
54 #endif
55
56 #include <netinet/ip_ecn.h>
57
58 /*
59 * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
60 */
61 void
62 ip_ecn_ingress(mode, outer, inner)
63 int mode;
64 u_int8_t *outer;
65 const u_int8_t *inner;
66 {
67 if (!outer || !inner)
68 panic("NULL pointer passed to ip_ecn_ingress");
69
70 *outer = *inner;
71 switch (mode) {
72 case ECN_ALLOWED: /* ECN allowed */
73 *outer &= ~IPTOS_CE;
74 break;
75 case ECN_FORBIDDEN: /* ECN forbidden */
76 *outer &= ~(IPTOS_ECT | IPTOS_CE);
77 break;
78 case ECN_NOCARE: /* no consideration to ECN */
79 break;
80 }
81 }
82
83 /*
84 * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
85 */
86 void
87 ip_ecn_egress(mode, outer, inner)
88 int mode;
89 const u_int8_t *outer;
90 u_int8_t *inner;
91 {
92 if (!outer || !inner)
93 panic("NULL pointer passed to ip_ecn_egress");
94
95 switch (mode) {
96 case ECN_ALLOWED:
97 if (*outer & IPTOS_CE)
98 *inner |= IPTOS_CE;
99 break;
100 case ECN_FORBIDDEN: /* ECN forbidden */
101 case ECN_NOCARE: /* no consideration to ECN */
102 break;
103 }
104 }
105
106 #ifdef INET6
107 void
108 ip6_ecn_ingress(mode, outer, inner)
109 int mode;
110 u_int32_t *outer;
111 const u_int32_t *inner;
112 {
113 u_int8_t outer8, inner8;
114
115 if (!outer || !inner)
116 panic("NULL pointer passed to ip6_ecn_ingress");
117
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);
123 }
124
125 void
126 ip6_ecn_egress(mode, outer, inner)
127 int mode;
128 const u_int32_t *outer;
129 u_int32_t *inner;
130 {
131 u_int8_t outer8, inner8;
132
133 if (!outer || !inner)
134 panic("NULL pointer passed to ip6_ecn_egress");
135
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);
141 }
142 #endif
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