1 /* $FreeBSD: src/sys/netinet/ip_ecn.c,v 1.1.2.3 2002/04/17 07:50:17 suz 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 "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 144