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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 <netinet/ip6.h>
#include <rte_mbuf.h>
static inline void *
ipip_outbound(struct rte_mbuf *m, uint32_t offset, uint32_t is_ipv6,
struct ip_addr *src, struct ip_addr *dst)
{
struct ip *inip4, *outip4;
struct ip6_hdr *inip6, *outip6;
uint8_t ds_ecn;
inip4 = rte_pktmbuf_mtod(m, struct ip *);
RTE_ASSERT(inip4->ip_v == IPVERSION || inip4->ip_v == IP6_VERSION);
if (inip4->ip_v == IPVERSION) {
/* XXX This should be done by the forwarding engine instead */
inip4->ip_ttl -= 1;
ds_ecn = inip4->ip_tos;
} else {
inip6 = (struct ip6_hdr *)inip4;
/* XXX This should be done by the forwarding engine instead */
inip6->ip6_hops -= 1;
ds_ecn = ntohl(inip6->ip6_flow) >> 20;
}
if (is_ipv6) {
offset += sizeof(struct ip6_hdr);
outip6 = (struct ip6_hdr *)rte_pktmbuf_prepend(m, offset);
RTE_ASSERT(outip6 != NULL);
/* Per RFC4301 5.1.2.1 */
outip6->ip6_flow = htonl(IP6_VERSION << 28 | ds_ecn << 20);
outip6->ip6_plen = htons(rte_pktmbuf_data_len(m) -
sizeof(struct ip6_hdr));
outip6->ip6_nxt = IPPROTO_ESP;
outip6->ip6_hops = IPDEFTTL;
memcpy(&outip6->ip6_src.s6_addr, src, 16);
memcpy(&outip6->ip6_dst.s6_addr, dst, 16);
return outip6;
}
offset += sizeof(struct ip);
outip4 = (struct ip *)rte_pktmbuf_prepend(m, offset);
RTE_ASSERT(outip4 != NULL);
/* Per RFC4301 5.1.2.1 */
outip4->ip_v = IPVERSION;
outip4->ip_hl = 5;
outip4->ip_tos = ds_ecn;
outip4->ip_len = htons(rte_pktmbuf_data_len(m));
outip4->ip_id = 0;
outip4->ip_off = 0;
outip4->ip_ttl = IPDEFTTL;
outip4->ip_p = IPPROTO_ESP;
outip4->ip_src.s_addr = src->ip.ip4;
outip4->ip_dst.s_addr = dst->ip.ip4;
return outip4;
}
static inline struct ip *
ip4ip_outbound(struct rte_mbuf *m, uint32_t offset,
struct ip_addr *src, struct ip_addr *dst)
{
return ipip_outbound(m, offset, 0, src, dst);
}
static inline struct ip6_hdr *
ip6ip_outbound(struct rte_mbuf *m, uint32_t offset,
struct ip_addr *src, struct ip_addr *dst)
{
return ipip_outbound(m, offset, 1, src, dst);
}
static inline void
ip4_ecn_setup(struct ip *ip4)
{
if (ip4->ip_tos & IPTOS_ECN_MASK)
ip4->ip_tos |= IPTOS_ECN_CE;
}
static inline void
ip6_ecn_setup(struct ip6_hdr *ip6)
{
if ((ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK)
ip6->ip6_flow = htonl(ntohl(ip6->ip6_flow) |
(IPTOS_ECN_CE << 20));
}
static inline void
ipip_inbound(struct rte_mbuf *m, uint32_t offset)
{
struct ip *inip4, *outip4;
struct ip6_hdr *inip6, *outip6;
uint32_t ip_len, set_ecn;
outip4 = rte_pktmbuf_mtod(m, struct ip*);
RTE_ASSERT(outip4->ip_v == IPVERSION || outip4->ip_v == IP6_VERSION);
if (outip4->ip_v == IPVERSION) {
ip_len = sizeof(struct ip);
set_ecn = ((outip4->ip_tos & IPTOS_ECN_CE) == IPTOS_ECN_CE);
} else {
outip6 = (struct ip6_hdr *)outip4;
ip_len = sizeof(struct ip6_hdr);
set_ecn = ntohl(outip6->ip6_flow) >> 20;
set_ecn = ((set_ecn & IPTOS_ECN_CE) == IPTOS_ECN_CE);
}
inip4 = (struct ip *)rte_pktmbuf_adj(m, offset + ip_len);
RTE_ASSERT(inip4->ip_v == IPVERSION || inip4->ip_v == IP6_VERSION);
/* Check packet is still bigger than IP header (inner) */
RTE_ASSERT(rte_pktmbuf_pkt_len(m) > ip_len);
/* RFC4301 5.1.2.1 Note 6 */
if (inip4->ip_v == IPVERSION) {
if (set_ecn)
ip4_ecn_setup(inip4);
/* XXX This should be done by the forwarding engine instead */
inip4->ip_ttl -= 1;
} else {
inip6 = (struct ip6_hdr *)inip4;
if (set_ecn)
ip6_ecn_setup(inip6);
/* XXX This should be done by the forwarding engine instead */
inip6->ip6_hops -= 1;
}
}
#endif /* __IPIP_H__ */
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