/*-
* BSD LICENSE
*
* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
* Copyright 2014 6WIND S.A.
* 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.
*/
/*
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)in.h 8.3 (Berkeley) 1/3/94
* $FreeBSD: src/sys/netinet/in.h,v 1.82 2003/10/25 09:37:10 ume Exp $
*/
#ifndef _RTE_IP_H_
#define _RTE_IP_H_
/**
* @file
*
* IP-related defines
*/
#include <stdint.h>
#include <netinet/in.h>
#include <rte_byteorder.h>
#include <rte_mbuf.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* IPv4 Header
*/
struct ipv4_hdr {
uint8_t version_ihl; /**< version and header length */
uint8_t type_of_service; /**< type of service */
uint16_t total_length; /**< length of packet */
uint16_t packet_id; /**< packet ID */
uint16_t fragment_offset; /**< fragmentation offset */
uint8_t time_to_live; /**< time to live */
uint8_t next_proto_id; /**< protocol ID */
uint16_t hdr_checksum; /**< header checksum */
uint32_t src_addr; /**< source address */
uint32_t dst_addr; /**< destination address */
} __attribute__((__packed__));
/** Create IPv4 address */
#define IPv4(a,b,c,d) ((uint32_t)(((a) & 0xff) << 24) | \
(((b) & 0xff) << 16) | \
(((c) & 0xff) << 8) | \
((d) & 0xff))
/** Maximal IPv4 packet length (including a header) */
#define IPV4_MAX_PKT_LEN 65535
/** Internet header length mask for version_ihl field */
#define IPV4_HDR_IHL_MASK (0x0f)
/**
* Internet header length field multiplier (IHL field specifies overall header
* length in number of 4-byte words)
*/
#define IPV4_IHL_MULTIPLIER (4)
/* Fragment Offset * Flags. */
#define IPV4_HDR_DF_SHIFT 14
#define IPV4_HDR_MF_SHIFT 13
#define IPV4_HDR_FO_SHIFT 3
#define IPV4_HDR_DF_FLAG (1 << IPV4_HDR_DF_SHIFT)
#define IPV4_HDR_MF_FLAG (1 << IPV4_HDR_MF_SHIFT)
#define IPV4_HDR_OFFSET_MASK ((1 << IPV4_HDR_MF_SHIFT) - 1)
#define IPV4_HDR_OFFSET_UNITS 8
/*
* IPv4 address types
*/
#define IPV4_ANY ((uint32_t)0x00000000) /**< 0.0.0.0 */
#define IPV4_LOOPBACK ((uint32_t)0x7f000001) /**< 127.0.0.1 */
#define IPV4_BROADCAST ((uint32_t)0xe0000000) /**< 224.0.0.0 */
#define IPV4_ALLHOSTS_GROUP ((uint32_t)0xe0000001) /**< 224.0.0.1 */
#define IPV4_ALLRTRS_GROUP ((uint32_t)0xe0000002) /**< 224.0.0.2 */
#define IPV4_MAX_LOCAL_GROUP ((uint32_t)0xe00000ff) /**< 224.0.0.255 */
/*
* IPv4 Multicast-related macros
*/
#define IPV4_MIN_MCAST IPv4(224, 0, 0, 0) /**< Minimal IPv4-multicast address */
#define IPV4_MAX_MCAST IPv4(239, 255, 255, 255) /**< Maximum IPv4 multicast address */
#define IS_IPV4_MCAST(x) \
((x) >= IPV4_MIN_MCAST && (x) <= IPV4_MAX_MCAST) /**< check if IPv4 address is multicast */
/**
* @internal Calculate a sum of all words in the buffer.
* Helper routine for the rte_raw_cksum().
*
* @param buf
* Pointer to the buffer.
* @param len
* Length of the buffer.
* @param sum
* Initial value of the sum.
* @return
* sum += Sum of all words in the buffer.
*/
static inline uint32_t
__rte_raw_cksum(const void *buf, size_t len, uint32_t sum)
{
/* workaround gcc strict-aliasing warning */
uintptr_t ptr = (uintptr_t)buf;
typedef uint16_t __attribute__((__may_alias__)) u16_p;
const u16_p *u16 = (const u16_p *)ptr;
while (len >= (sizeof(*u16) * 4)) {
sum += u16[0];
sum += u16[1];
sum += u16[2];
sum += u16[3];
len -= sizeof(*u16) * 4;
u16 += 4;
}
while (len >= sizeof(*u16)) {
sum += *u16;
len -= sizeof(*u16);
u16 += 1;
}
/* if length is in odd bytes */
if (len == 1)
sum += *((const uint8_t *)u16);
return sum;
}
/**
* @internal Reduce a sum to the non-complemented checksum.
* Helper routine for the rte_raw_cksum().
*
* @param sum
* Value of the sum.
* @return
* The non-complemented checksum.
*/
static inline uint16_t
__rte_raw_cksum_reduce(uint32_t sum)
{
sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
sum = ((sum & 0xffff0000) >> 16) + (sum & 0xffff);
return (uint16_t)sum;
}
/**
* Process the non-complemented checksum of a buffer.
*
* @param buf
* Pointer to the buffer.
* @param len
* Length of the buffer.
* @return
* The non-complemented checksum.
*/
static inline uint16_t
rte_raw_cksum(const void *buf, size_t len)
{
uint32_t sum;
sum = __rte_raw_cksum(buf, len, 0);
return __rte_raw_cksum_reduce(sum);
}
/**
* Process the IPv4 checksum of an IPv4 header.
*
* The checksum field must be set to 0 by the caller.
*
* @param ipv4_hdr
* The pointer to the contiguous IPv4 header.
* @return
* The complemented checksum to set in the IP packet.
*/
static inline uint16_t
rte_ipv4_cksum(const struct ipv4_hdr *ipv4_hdr)
{
uint16_t cksum;
cksum = rte_raw_cksum(ipv4_hdr, sizeof(struct ipv4_hdr));
return (cksum == 0xffff) ? cksum : ~cksum;
}
/**
* Process the pseudo-header checksum of an IPv4 header.
*
* The checksum field must be set to 0 by the caller.
*
* Depending on the ol_flags, the pseudo-header checksum expected by the
* drivers is not the same. For instance, when TSO is enabled, the IP
* payload length must not be included in the packet.
*
* When ol_flags is 0, it computes the standard pseudo-header checksum.
*
* @param ipv4_hdr
* The pointer to the contiguous IPv4 header.
* @param ol_flags
* The ol_flags of the associated mbuf.
* @return
* The non-complemented checksum to set in the L4 header.
*/
static inline uint16_t
rte_ipv4_phdr_cksum(const struct ipv4_hdr *ipv4_hdr, uint64_t ol_flags)
{
struct ipv4_psd_header {
uint32_t src_addr; /* IP address of source host. */
uint32_t dst_addr; /* IP address of destination host. */
uint8_t zero; /* zero. */
uint8_t proto; /* L4 protocol type. */
uint16_t len; /* L4 length. */
} psd_hdr;
psd_hdr.src_addr = ipv4_hdr->src_addr;
psd_hdr.dst_addr = ipv4_hdr->dst_addr;
psd_hdr.zero = 0;
psd_hdr.proto = ipv4_hdr->next_proto_id;
if (ol_flags & PKT_TX_TCP_SEG) {
psd_hdr.len = 0;
} else {
psd_hdr.len = rte_cpu_to_be_16(
(uint16_t)(rte_be_to_cpu_16(ipv4_hdr->total_length)
- sizeof(struct ipv4_hdr)));
}
return rte_raw_cksum(&psd_hdr, sizeof(psd_hdr));
}
/**
* Process the IPv4 UDP or TCP checksum.
*
* The IPv4 header should not contains options. The IP and layer 4
* checksum must be set to 0 in the packet by the caller.
*
* @param ipv4_hdr
* The pointer to the contiguous IPv4 header.
* @param l4_hdr
* The pointer to the beginning of the L4 header.
* @return
* The complemented checksum to set in the IP packet.
*/
static inline uint16_t
rte_ipv4_udptcp_cksum(const struct ipv4_hdr *ipv4_hdr, const void *l4_hdr)
{
uint32_t cksum;
uint32_t l4_len;
l4_len = rte_be_to_cpu_16(ipv4_hdr->total_length) -
sizeof(struct ipv4_hdr);
cksum = rte_raw_cksum(l4_hdr, l4_len);
cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0);
cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
cksum = (~cksum) & 0xffff;
if (cksum == 0)
cksum = 0xffff;
return cksum;
}
/**
* IPv6 Header
*/
struct ipv6_hdr {
uint32_t vtc_flow; /**< IP version, traffic class & flow label. */
uint16_t payload_len; /**< IP packet length - includes sizeof(ip_header). */
uint8_t proto; /**< Protocol, next header. */
uint8_t hop_limits; /**< Hop limits. */
uint8_t src_addr[16]; /**< IP address of source host. */
uint8_t dst_addr[16]; /**< IP address of destination host(s). */
} __attribute__((__packed__));
/**
* Process the pseudo-header checksum of an IPv6 header.
*
* Depending on the ol_flags, the pseudo-header checksum expected by the
* drivers is not the same. For instance, when TSO is enabled, the IPv6
* payload length must not be included in the packet.
*
* When ol_flags is 0, it computes the standard pseudo-header checksum.
*
* @param ipv6_hdr
* The pointer to the contiguous IPv6 header.
* @param ol_flags
* The ol_flags of the associated mbuf.
* @return
* The non-complemented checksum to set in the L4 header.
*/
static inline uint16_t
rte_ipv6_phdr_cksum(const struct ipv6_hdr *ipv6_hdr, uint64_t ol_flags)
{
uint32_t sum;
struct {
uint32_t len; /* L4 length. */
uint32_t proto; /* L4 protocol - top 3 bytes must be zero */
} psd_hdr;
psd_hdr.proto = (ipv6_hdr->proto << 24);
if (ol_flags & PKT_TX_TCP_SEG) {
psd_hdr.len = 0;
} else {
psd_hdr.len = ipv6_hdr->payload_len;
}
sum = __rte_raw_cksum(ipv6_hdr->src_addr,
sizeof(ipv6_hdr->src_addr) + sizeof(ipv6_hdr->dst_addr),
0);
sum = __rte_raw_cksum(&psd_hdr, sizeof(psd_hdr), sum);
return __rte_raw_cksum_reduce(sum);
}
/**
* Process the IPv6 UDP or TCP checksum.
*
* The IPv4 header should not contains options. The layer 4 checksum
* must be set to 0 in the packet by the caller.
*
* @param ipv6_hdr
* The pointer to the contiguous IPv6 header.
* @param l4_hdr
* The pointer to the beginning of the L4 header.
* @return
* The complemented checksum to set in the IP packet.
*/
static inline uint16_t
rte_ipv6_udptcp_cksum(const struct ipv6_hdr *ipv6_hdr, const void *l4_hdr)
{
uint32_t cksum;
uint32_t l4_len;
l4_len = rte_be_to_cpu_16(ipv6_hdr->payload_len);
cksum = rte_raw_cksum(l4_hdr, l4_len);
cksum += rte_ipv6_phdr_cksum(ipv6_hdr, 0);
cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff);
cksum = (~cksum) & 0xffff;
if (cksum == 0)
cksum = 0xffff;
return cksum;
}
#ifdef __cplusplus
}
#endif
#endif /* _RTE_IP_H_ */