1 /*- 2 * BSD LICENSE 3 * 4 * Copyright(c) 2016 Intel Corporation. All rights reserved. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * * Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * * Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * * Neither the name of Intel Corporation nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #ifndef __IPIP_H__ 35 #define __IPIP_H__ 36 37 #include <stdint.h> 38 #include <netinet/in.h> 39 #include <netinet/ip.h> 40 #include <netinet/ip6.h> 41 42 #include <rte_mbuf.h> 43 44 static inline void * 45 ipip_outbound(struct rte_mbuf *m, uint32_t offset, uint32_t is_ipv6, 46 struct ip_addr *src, struct ip_addr *dst) 47 { 48 struct ip *inip4, *outip4; 49 struct ip6_hdr *inip6, *outip6; 50 uint8_t ds_ecn; 51 52 inip4 = rte_pktmbuf_mtod(m, struct ip *); 53 54 RTE_ASSERT(inip4->ip_v == IPVERSION || inip4->ip_v == IP6_VERSION); 55 56 if (inip4->ip_v == IPVERSION) { 57 /* XXX This should be done by the forwarding engine instead */ 58 inip4->ip_ttl -= 1; 59 ds_ecn = inip4->ip_tos; 60 } else { 61 inip6 = (struct ip6_hdr *)inip4; 62 /* XXX This should be done by the forwarding engine instead */ 63 inip6->ip6_hops -= 1; 64 ds_ecn = ntohl(inip6->ip6_flow) >> 20; 65 } 66 67 if (is_ipv6) { 68 offset += sizeof(struct ip6_hdr); 69 outip6 = (struct ip6_hdr *)rte_pktmbuf_prepend(m, offset); 70 71 RTE_ASSERT(outip6 != NULL); 72 73 /* Per RFC4301 5.1.2.1 */ 74 outip6->ip6_flow = htonl(IP6_VERSION << 28 | ds_ecn << 20); 75 outip6->ip6_plen = htons(rte_pktmbuf_data_len(m)); 76 77 outip6->ip6_nxt = IPPROTO_ESP; 78 outip6->ip6_hops = IPDEFTTL; 79 80 memcpy(&outip6->ip6_src.s6_addr, src, 16); 81 memcpy(&outip6->ip6_dst.s6_addr, dst, 16); 82 83 return outip6; 84 } 85 86 offset += sizeof(struct ip); 87 outip4 = (struct ip *)rte_pktmbuf_prepend(m, offset); 88 89 RTE_ASSERT(outip4 != NULL); 90 91 /* Per RFC4301 5.1.2.1 */ 92 outip4->ip_v = IPVERSION; 93 outip4->ip_hl = 5; 94 outip4->ip_tos = ds_ecn; 95 outip4->ip_len = htons(rte_pktmbuf_data_len(m)); 96 97 outip4->ip_id = 0; 98 outip4->ip_off = 0; 99 100 outip4->ip_ttl = IPDEFTTL; 101 outip4->ip_p = IPPROTO_ESP; 102 103 outip4->ip_src.s_addr = src->ip.ip4; 104 outip4->ip_dst.s_addr = dst->ip.ip4; 105 106 return outip4; 107 } 108 109 static inline struct ip * 110 ip4ip_outbound(struct rte_mbuf *m, uint32_t offset, 111 struct ip_addr *src, struct ip_addr *dst) 112 { 113 return ipip_outbound(m, offset, 0, src, dst); 114 } 115 116 static inline struct ip6_hdr * 117 ip6ip_outbound(struct rte_mbuf *m, uint32_t offset, 118 struct ip_addr *src, struct ip_addr *dst) 119 { 120 return ipip_outbound(m, offset, 1, src, dst); 121 } 122 123 static inline void 124 ip4_ecn_setup(struct ip *ip4) 125 { 126 if (ip4->ip_tos & IPTOS_ECN_MASK) 127 ip4->ip_tos |= IPTOS_ECN_CE; 128 } 129 130 static inline void 131 ip6_ecn_setup(struct ip6_hdr *ip6) 132 { 133 if ((ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK) 134 ip6->ip6_flow = htonl(ntohl(ip6->ip6_flow) | 135 (IPTOS_ECN_CE << 20)); 136 } 137 138 static inline void 139 ipip_inbound(struct rte_mbuf *m, uint32_t offset) 140 { 141 struct ip *inip4, *outip4; 142 struct ip6_hdr *inip6, *outip6; 143 uint32_t ip_len, set_ecn; 144 145 outip4 = rte_pktmbuf_mtod(m, struct ip*); 146 147 RTE_ASSERT(outip4->ip_v == IPVERSION || outip4->ip_v == IP6_VERSION); 148 149 if (outip4->ip_v == IPVERSION) { 150 ip_len = sizeof(struct ip); 151 set_ecn = ((outip4->ip_tos & IPTOS_ECN_CE) == IPTOS_ECN_CE); 152 } else { 153 outip6 = (struct ip6_hdr *)outip4; 154 ip_len = sizeof(struct ip6_hdr); 155 set_ecn = ntohl(outip6->ip6_flow) >> 20; 156 set_ecn = ((set_ecn & IPTOS_ECN_CE) == IPTOS_ECN_CE); 157 } 158 159 inip4 = (struct ip *)rte_pktmbuf_adj(m, offset + ip_len); 160 RTE_ASSERT(inip4->ip_v == IPVERSION || inip4->ip_v == IP6_VERSION); 161 162 /* Check packet is still bigger than IP header (inner) */ 163 RTE_ASSERT(rte_pktmbuf_pkt_len(m) > ip_len); 164 165 /* RFC4301 5.1.2.1 Note 6 */ 166 if (inip4->ip_v == IPVERSION) { 167 if (set_ecn) 168 ip4_ecn_setup(inip4); 169 /* XXX This should be done by the forwarding engine instead */ 170 inip4->ip_ttl -= 1; 171 } else { 172 inip6 = (struct ip6_hdr *)inip4; 173 if (set_ecn) 174 ip6_ecn_setup(inip6); 175 /* XXX This should be done by the forwarding engine instead */ 176 inip6->ip6_hops -= 1; 177 } 178 } 179 180 #endif /* __IPIP_H__ */ 181