| 1 | /* $NetBSD: ip_ecn.c,v 1.16 2015/08/24 22:21:26 pooka 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 1.16 2015/08/24 22:21:26 pooka Exp $" ); |
| 40 | |
| 41 | #ifdef _KERNEL_OPT |
| 42 | #include "opt_inet.h" |
| 43 | #endif |
| 44 | |
| 45 | #include <sys/param.h> |
| 46 | #include <sys/systm.h> |
| 47 | #include <sys/malloc.h> |
| 48 | #include <sys/mbuf.h> |
| 49 | #include <sys/errno.h> |
| 50 | |
| 51 | #include <netinet/in.h> |
| 52 | #include <netinet/in_systm.h> |
| 53 | #include <netinet/ip.h> |
| 54 | #ifdef INET6 |
| 55 | #include <netinet/ip6.h> |
| 56 | #endif |
| 57 | |
| 58 | #include <netinet/ip_ecn.h> |
| 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_ECN_CE; |
| 73 | break; |
| 74 | case ECN_FORBIDDEN: /* ECN forbidden */ |
| 75 | *outer &= ~(IPTOS_ECN_ECT0 | IPTOS_ECN_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_ECN_CE) |
| 94 | *inner |= IPTOS_ECN_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 | |