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/*-
* BSD LICENSE
*
* Copyright(c) 2016 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __IPIP_H__
#define __IPIP_H__
#include <stdint.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <rte_mbuf.h>
#define IPV6_VERSION (6)
static inline struct ip *
ip4ip_outbound(struct rte_mbuf *m, uint32_t offset, uint32_t src, uint32_t dst)
{
struct ip *inip, *outip;
inip = rte_pktmbuf_mtod(m, struct ip*);
IPSEC_ASSERT(inip->ip_v == IPVERSION || inip->ip_v == IPV6_VERSION);
offset += sizeof(struct ip);
outip = (struct ip *)rte_pktmbuf_prepend(m, offset);
IPSEC_ASSERT(outip != NULL);
/* Per RFC4301 5.1.2.1 */
outip->ip_v = IPVERSION;
outip->ip_hl = 5;
outip->ip_tos = inip->ip_tos;
outip->ip_len = htons(rte_pktmbuf_data_len(m));
outip->ip_id = 0;
outip->ip_off = 0;
outip->ip_ttl = IPDEFTTL;
outip->ip_p = IPPROTO_ESP;
outip->ip_src.s_addr = src;
outip->ip_dst.s_addr = dst;
return outip;
}
static inline int
ip4ip_inbound(struct rte_mbuf *m, uint32_t offset)
{
struct ip *inip;
struct ip *outip;
outip = rte_pktmbuf_mtod(m, struct ip*);
IPSEC_ASSERT(outip->ip_v == IPVERSION);
offset += sizeof(struct ip);
inip = (struct ip *)rte_pktmbuf_adj(m, offset);
IPSEC_ASSERT(inip->ip_v == IPVERSION || inip->ip_v == IPV6_VERSION);
/* Check packet is still bigger than IP header (inner) */
IPSEC_ASSERT(rte_pktmbuf_pkt_len(m) > sizeof(struct ip));
/* RFC4301 5.1.2.1 Note 6 */
if ((inip->ip_tos & htons(IPTOS_ECN_ECT0 | IPTOS_ECN_ECT1)) &&
((outip->ip_tos & htons(IPTOS_ECN_CE)) == IPTOS_ECN_CE))
inip->ip_tos |= htons(IPTOS_ECN_CE);
return 0;
}
#endif /* __IPIP_H__ */
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