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 41 #include <rte_mbuf.h> 42 43 #define IPV6_VERSION (6) 44 45 static inline struct ip * 46 ip4ip_outbound(struct rte_mbuf *m, uint32_t offset, uint32_t src, uint32_t dst) 47 { 48 struct ip *inip, *outip; 49 50 inip = rte_pktmbuf_mtod(m, struct ip*); 51 52 IPSEC_ASSERT(inip->ip_v == IPVERSION || inip->ip_v == IPV6_VERSION); 53 54 offset += sizeof(struct ip); 55 56 outip = (struct ip *)rte_pktmbuf_prepend(m, offset); 57 58 IPSEC_ASSERT(outip != NULL); 59 60 /* Per RFC4301 5.1.2.1 */ 61 outip->ip_v = IPVERSION; 62 outip->ip_hl = 5; 63 outip->ip_tos = inip->ip_tos; 64 outip->ip_len = htons(rte_pktmbuf_data_len(m)); 65 66 outip->ip_id = 0; 67 outip->ip_off = 0; 68 69 outip->ip_ttl = IPDEFTTL; 70 outip->ip_p = IPPROTO_ESP; 71 72 outip->ip_src.s_addr = src; 73 outip->ip_dst.s_addr = dst; 74 75 return outip; 76 } 77 78 static inline int 79 ip4ip_inbound(struct rte_mbuf *m, uint32_t offset) 80 { 81 struct ip *inip; 82 struct ip *outip; 83 84 outip = rte_pktmbuf_mtod(m, struct ip*); 85 86 IPSEC_ASSERT(outip->ip_v == IPVERSION); 87 88 offset += sizeof(struct ip); 89 inip = (struct ip *)rte_pktmbuf_adj(m, offset); 90 IPSEC_ASSERT(inip->ip_v == IPVERSION || inip->ip_v == IPV6_VERSION); 91 92 /* Check packet is still bigger than IP header (inner) */ 93 IPSEC_ASSERT(rte_pktmbuf_pkt_len(m) > sizeof(struct ip)); 94 95 /* RFC4301 5.1.2.1 Note 6 */ 96 if ((inip->ip_tos & htons(IPTOS_ECN_ECT0 | IPTOS_ECN_ECT1)) && 97 ((outip->ip_tos & htons(IPTOS_ECN_CE)) == IPTOS_ECN_CE)) 98 inip->ip_tos |= htons(IPTOS_ECN_CE); 99 100 return 0; 101 } 102 103 #endif /* __IPIP_H__ */ 104