FreeBSD/Linux Kernel Cross Reference
sys/netinet/ip_ecn.c
1 /* $FreeBSD$ */
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 "opt_inet.h"
39 #include "opt_inet6.h"
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45 #include <sys/errno.h>
46
47 #include <netinet/in.h>
48 #include <netinet/in_systm.h>
49 #include <netinet/ip.h>
50 #ifdef INET6
51 #include <netinet/ip6.h>
52 #endif
53
54 #include <netinet/ip_ecn.h>
55 #ifdef INET6
56 #include <netinet6/ip6_ecn.h>
57 #endif
58
59 /*
60 * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation).
61 */
62 void
63 ip_ecn_ingress(mode, outer, inner)
64 int mode;
65 u_int8_t *outer;
66 const u_int8_t *inner;
67 {
68 if (!outer || !inner)
69 panic("NULL pointer passed to ip_ecn_ingress");
70
71 *outer = *inner;
72 switch (mode) {
73 case ECN_ALLOWED: /* ECN allowed */
74 *outer &= ~IPTOS_CE;
75 break;
76 case ECN_FORBIDDEN: /* ECN forbidden */
77 *outer &= ~(IPTOS_ECT | IPTOS_CE);
78 break;
79 case ECN_NOCARE: /* no consideration to ECN */
80 break;
81 }
82 }
83
84 /*
85 * modify inner ECN (TOS) field on egress operation (tunnel decapsulation).
86 */
87 void
88 ip_ecn_egress(mode, outer, inner)
89 int mode;
90 const u_int8_t *outer;
91 u_int8_t *inner;
92 {
93 if (!outer || !inner)
94 panic("NULL pointer passed to ip_ecn_egress");
95
96 switch (mode) {
97 case ECN_ALLOWED:
98 if (*outer & IPTOS_CE)
99 *inner |= IPTOS_CE;
100 break;
101 case ECN_FORBIDDEN: /* ECN forbidden */
102 case ECN_NOCARE: /* no consideration to ECN */
103 break;
104 }
105 }
106
107 #ifdef INET6
108 void
109 ip6_ecn_ingress(mode, outer, inner)
110 int mode;
111 u_int32_t *outer;
112 const u_int32_t *inner;
113 {
114 u_int8_t outer8, inner8;
115
116 if (!outer || !inner)
117 panic("NULL pointer passed to ip6_ecn_ingress");
118
119 outer8 = (ntohl(*outer) >> 20) & 0xff;
120 inner8 = (ntohl(*inner) >> 20) & 0xff;
121 ip_ecn_ingress(mode, &outer8, &inner8);
122 *outer &= ~htonl(0xff << 20);
123 *outer |= htonl((u_int32_t)outer8 << 20);
124 }
125
126 void
127 ip6_ecn_egress(mode, outer, inner)
128 int mode;
129 const u_int32_t *outer;
130 u_int32_t *inner;
131 {
132 u_int8_t outer8, inner8;
133
134 if (!outer || !inner)
135 panic("NULL pointer passed to ip6_ecn_egress");
136
137 outer8 = (ntohl(*outer) >> 20) & 0xff;
138 inner8 = (ntohl(*inner) >> 20) & 0xff;
139 ip_ecn_egress(mode, &outer8, &inner8);
140 *inner &= ~htonl(0xff << 20);
141 *inner |= htonl((u_int32_t)inner8 << 20);
142 }
143 #endif
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