ceph/src/dpdk/examples/ipsec-secgw/ipip.h

   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__ */