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 1.3 2006/01/14 11:33:50 swildner 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(int mode, u_int8_t *outer, const u_int8_t *inner) 65 { 66 if (!outer || !inner) 67 panic("NULL pointer passed to ip_ecn_ingress"); 68 69 *outer = *inner; 70 switch (mode) { 71 case ECN_ALLOWED: /* ECN allowed */ 72 *outer &= ~IPTOS_CE; 73 break; 74 case ECN_FORBIDDEN: /* ECN forbidden */ 75 *outer &= ~(IPTOS_ECT | IPTOS_CE); 76 break; 77 case ECN_NOCARE: /* no consideration to ECN */ 78 break; 79 } 80 } 81 82 /* 83 * modify inner ECN (TOS) field on egress operation (tunnel decapsulation). 84 */ 85 void 86 ip_ecn_egress(int mode, const u_int8_t *outer, u_int8_t *inner) 87 { 88 if (!outer || !inner) 89 panic("NULL pointer passed to ip_ecn_egress"); 90 91 switch (mode) { 92 case ECN_ALLOWED: 93 if (*outer & IPTOS_CE) 94 *inner |= IPTOS_CE; 95 break; 96 case ECN_FORBIDDEN: /* ECN forbidden */ 97 case ECN_NOCARE: /* no consideration to ECN */ 98 break; 99 } 100 } 101 102 #ifdef INET6 103 void 104 ip6_ecn_ingress(int mode, u_int32_t *outer, const u_int32_t *inner) 105 { 106 u_int8_t outer8, inner8; 107 108 if (!outer || !inner) 109 panic("NULL pointer passed to ip6_ecn_ingress"); 110 111 outer8 = (ntohl(*outer) >> 20) & 0xff; 112 inner8 = (ntohl(*inner) >> 20) & 0xff; 113 ip_ecn_ingress(mode, &outer8, &inner8); 114 *outer &= ~htonl(0xff << 20); 115 *outer |= htonl((u_int32_t)outer8 << 20); 116 } 117 118 void 119 ip6_ecn_egress(int mode, const u_int32_t *outer, u_int32_t *inner) 120 { 121 u_int8_t outer8, inner8; 122 123 if (!outer || !inner) 124 panic("NULL pointer passed to ip6_ecn_egress"); 125 126 outer8 = (ntohl(*outer) >> 20) & 0xff; 127 inner8 = (ntohl(*inner) >> 20) & 0xff; 128 ip_ecn_egress(mode, &outer8, &inner8); 129 *inner &= ~htonl(0xff << 20); 130 *inner |= htonl((u_int32_t)inner8 << 20); 131 } 132 #endif 133