1 /* $FreeBSD: src/sys/netinet/ip_ecn.c,v 1.1.2.3 2002/04/17 07:50:17 suz Exp $ */ 2 /* $DragonFly: src/sys/netinet/ip_ecn.c,v 1.2 2003/06/17 04:28:51 dillon Exp $ */ 3 /* $KAME: ip_ecn.c,v 1.11 2001/05/03 16:09:29 itojun Exp $ */ 4 5 /* 6 * Copyright (C) 1999 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 */ 34 /* 35 * ECN consideration on tunnel ingress/egress operation. 36 * http://www.aciri.org/floyd/papers/draft-ipsec-ecn-00.txt 37 */ 38 39 #include "opt_inet.h" 40 #include "opt_inet6.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/malloc.h> 45 #include <sys/mbuf.h> 46 #include <sys/errno.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_systm.h> 50 #include <netinet/ip.h> 51 #ifdef INET6 52 #include <netinet/ip6.h> 53 #endif 54 55 #include <netinet/ip_ecn.h> 56 #ifdef INET6 57 #include <netinet6/ip6_ecn.h> 58 #endif 59 60 /* 61 * modify outer ECN (TOS) field on ingress operation (tunnel encapsulation). 62 */ 63 void 64 ip_ecn_ingress(mode, outer, inner) 65 int mode; 66 u_int8_t *outer; 67 const u_int8_t *inner; 68 { 69 if (!outer || !inner) 70 panic("NULL pointer passed to ip_ecn_ingress"); 71 72 *outer = *inner; 73 switch (mode) { 74 case ECN_ALLOWED: /* ECN allowed */ 75 *outer &= ~IPTOS_CE; 76 break; 77 case ECN_FORBIDDEN: /* ECN forbidden */ 78 *outer &= ~(IPTOS_ECT | IPTOS_CE); 79 break; 80 case ECN_NOCARE: /* no consideration to ECN */ 81 break; 82 } 83 } 84 85 /* 86 * modify inner ECN (TOS) field on egress operation (tunnel decapsulation). 87 */ 88 void 89 ip_ecn_egress(mode, outer, inner) 90 int mode; 91 const u_int8_t *outer; 92 u_int8_t *inner; 93 { 94 if (!outer || !inner) 95 panic("NULL pointer passed to ip_ecn_egress"); 96 97 switch (mode) { 98 case ECN_ALLOWED: 99 if (*outer & IPTOS_CE) 100 *inner |= IPTOS_CE; 101 break; 102 case ECN_FORBIDDEN: /* ECN forbidden */ 103 case ECN_NOCARE: /* no consideration to ECN */ 104 break; 105 } 106 } 107 108 #ifdef INET6 109 void 110 ip6_ecn_ingress(mode, outer, inner) 111 int mode; 112 u_int32_t *outer; 113 const u_int32_t *inner; 114 { 115 u_int8_t outer8, inner8; 116 117 if (!outer || !inner) 118 panic("NULL pointer passed to ip6_ecn_ingress"); 119 120 outer8 = (ntohl(*outer) >> 20) & 0xff; 121 inner8 = (ntohl(*inner) >> 20) & 0xff; 122 ip_ecn_ingress(mode, &outer8, &inner8); 123 *outer &= ~htonl(0xff << 20); 124 *outer |= htonl((u_int32_t)outer8 << 20); 125 } 126 127 void 128 ip6_ecn_egress(mode, outer, inner) 129 int mode; 130 const u_int32_t *outer; 131 u_int32_t *inner; 132 { 133 u_int8_t outer8, inner8; 134 135 if (!outer || !inner) 136 panic("NULL pointer passed to ip6_ecn_egress"); 137 138 outer8 = (ntohl(*outer) >> 20) & 0xff; 139 inner8 = (ntohl(*inner) >> 20) & 0xff; 140 ip_ecn_egress(mode, &outer8, &inner8); 141 *inner &= ~htonl(0xff << 20); 142 *inner |= htonl((u_int32_t)inner8 << 20); 143 } 144 #endif 145