numam-dpdk/lib/librte_net/rte_ether.h

/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright(c) 2010-2014 Intel Corporation
 */

#ifndef _RTE_ETHER_H_
#define _RTE_ETHER_H_

/**
 * @file
 *
 * Ethernet Helpers in RTE
 */

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <stdio.h>

#include <rte_memcpy.h>
#include <rte_random.h>
#include <rte_mbuf.h>
#include <rte_byteorder.h>

#define RTE_ETHER_ADDR_LEN  6 /**< Length of Ethernet address. */
#define RTE_ETHER_TYPE_LEN  2 /**< Length of Ethernet type field. */
#define RTE_ETHER_CRC_LEN   4 /**< Length of Ethernet CRC. */
#define RTE_ETHER_HDR_LEN   \
	(RTE_ETHER_ADDR_LEN * 2 + \
		RTE_ETHER_TYPE_LEN) /**< Length of Ethernet header. */
#define RTE_ETHER_MIN_LEN   64    /**< Minimum frame len, including CRC. */
#define RTE_ETHER_MAX_LEN   1518  /**< Maximum frame len, including CRC. */
#define RTE_ETHER_MTU       \
	(RTE_ETHER_MAX_LEN - RTE_ETHER_HDR_LEN - \
		RTE_ETHER_CRC_LEN) /**< Ethernet MTU. */

#define RTE_ETHER_MAX_VLAN_FRAME_LEN \
	(RTE_ETHER_MAX_LEN + 4)
	/**< Maximum VLAN frame length, including CRC. */

#define RTE_ETHER_MAX_JUMBO_FRAME_LEN \
	0x3F00 /**< Maximum Jumbo frame length, including CRC. */

#define RTE_ETHER_MAX_VLAN_ID  4095 /**< Maximum VLAN ID. */

#define RTE_ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */

/**
 * Ethernet address:
 * A universally administered address is uniquely assigned to a device by its
 * manufacturer. The first three octets (in transmission order) contain the
 * Organizationally Unique Identifier (OUI). The following three (MAC-48 and
 * EUI-48) octets are assigned by that organization with the only constraint
 * of uniqueness.
 * A locally administered address is assigned to a device by a network
 * administrator and does not contain OUIs.
 * See http://standards.ieee.org/regauth/groupmac/tutorial.html
 */
struct rte_ether_addr {
	uint8_t addr_bytes[RTE_ETHER_ADDR_LEN]; /**< Addr bytes in tx order */
} __attribute__((aligned(2)));

#define RTE_ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
#define RTE_ETHER_GROUP_ADDR  0x01 /**< Multicast or broadcast Eth. address. */

/**
 * Check if two Ethernet addresses are the same.
 *
 * @param ea1
 *  A pointer to the first ether_addr structure containing
 *  the ethernet address.
 * @param ea2
 *  A pointer to the second ether_addr structure containing
 *  the ethernet address.
 *
 * @return
 *  True  (1) if the given two ethernet address are the same;
 *  False (0) otherwise.
 */
static inline int rte_is_same_ether_addr(const struct rte_ether_addr *ea1,
				     const struct rte_ether_addr *ea2)
{
	const uint16_t *w1 = (const uint16_t *)ea1;
	const uint16_t *w2 = (const uint16_t *)ea2;

	return ((w1[0] ^ w2[0]) | (w1[1] ^ w2[1]) | (w1[2] ^ w2[2])) == 0;
}

/**
 * Check if an Ethernet address is filled with zeros.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is filled with zeros;
 *   false (0) otherwise.
 */
static inline int rte_is_zero_ether_addr(const struct rte_ether_addr *ea)
{
	const uint16_t *w = (const uint16_t *)ea;

	return (w[0] | w[1] | w[2]) == 0;
}

/**
 * Check if an Ethernet address is a unicast address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a unicast address;
 *   false (0) otherwise.
 */
static inline int rte_is_unicast_ether_addr(const struct rte_ether_addr *ea)
{
	return (ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR) == 0;
}

/**
 * Check if an Ethernet address is a multicast address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a multicast address;
 *   false (0) otherwise.
 */
static inline int rte_is_multicast_ether_addr(const struct rte_ether_addr *ea)
{
	return ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR;
}

/**
 * Check if an Ethernet address is a broadcast address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a broadcast address;
 *   false (0) otherwise.
 */
static inline int rte_is_broadcast_ether_addr(const struct rte_ether_addr *ea)
{
	const uint16_t *ea_words = (const uint16_t *)ea;

	return (ea_words[0] == 0xFFFF && ea_words[1] == 0xFFFF &&
		ea_words[2] == 0xFFFF);
}

/**
 * Check if an Ethernet address is a universally assigned address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a universally assigned address;
 *   false (0) otherwise.
 */
static inline int rte_is_universal_ether_addr(const struct rte_ether_addr *ea)
{
	return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) == 0;
}

/**
 * Check if an Ethernet address is a locally assigned address.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is a locally assigned address;
 *   false (0) otherwise.
 */
static inline int rte_is_local_admin_ether_addr(const struct rte_ether_addr *ea)
{
	return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) != 0;
}

/**
 * Check if an Ethernet address is a valid address. Checks that the address is a
 * unicast address and is not filled with zeros.
 *
 * @param ea
 *   A pointer to a ether_addr structure containing the ethernet address
 *   to check.
 * @return
 *   True  (1) if the given ethernet address is valid;
 *   false (0) otherwise.
 */
static inline int rte_is_valid_assigned_ether_addr(const struct rte_ether_addr *ea)
{
	return rte_is_unicast_ether_addr(ea) && (!rte_is_zero_ether_addr(ea));
}

/**
 * Generate a random Ethernet address that is locally administered
 * and not multicast.
 * @param addr
 *   A pointer to Ethernet address.
 */
void
rte_eth_random_addr(uint8_t *addr);

/**
 * Fast copy an Ethernet address.
 *
 * @param ea_from
 *   A pointer to a ether_addr structure holding the Ethernet address to copy.
 * @param ea_to
 *   A pointer to a ether_addr structure where to copy the Ethernet address.
 */
static inline void rte_ether_addr_copy(const struct rte_ether_addr *ea_from,
				   struct rte_ether_addr *ea_to)
{
#ifdef __INTEL_COMPILER
	uint16_t *from_words = (uint16_t *)(ea_from->addr_bytes);
	uint16_t *to_words   = (uint16_t *)(ea_to->addr_bytes);

	to_words[0] = from_words[0];
	to_words[1] = from_words[1];
	to_words[2] = from_words[2];
#else
	/*
	 * Use the common way, because of a strange gcc warning.
	 */
	*ea_to = *ea_from;
#endif
}

#define RTE_ETHER_ADDR_FMT_SIZE         18
/**
 * Format 48bits Ethernet address in pattern xx:xx:xx:xx:xx:xx.
 *
 * @param buf
 *   A pointer to buffer contains the formatted MAC address.
 * @param size
 *   The format buffer size.
 * @param eth_addr
 *   A pointer to a ether_addr structure.
 */
void
rte_ether_format_addr(char *buf, uint16_t size,
		      const struct rte_ether_addr *eth_addr);
/**
 * Convert string with Ethernet address to an ether_addr.
 *
 * @param str
 *   A pointer to buffer contains the formatted MAC address.
 *   The supported formats are:
 *     XX:XX:XX:XX:XX:XX or XXXX:XXXX:XXXX
 *   where XX is a hex digit: 0-9, a-f, or A-F.
 * @param eth_addr
 *   A pointer to a ether_addr structure.
 * @return
 *   0 if successful
 *   -1 and sets rte_errno if invalid string
 */
__rte_experimental
int
rte_ether_unformat_addr(const char *str, struct rte_ether_addr *eth_addr);

/**
 * Ethernet header: Contains the destination address, source address
 * and frame type.
 */
struct rte_ether_hdr {
	struct rte_ether_addr d_addr; /**< Destination address. */
	struct rte_ether_addr s_addr; /**< Source address. */
	uint16_t ether_type;      /**< Frame type. */
} __attribute__((aligned(2)));

/**
 * Ethernet VLAN Header.
 * Contains the 16-bit VLAN Tag Control Identifier and the Ethernet type
 * of the encapsulated frame.
 */
struct rte_vlan_hdr {
	uint16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
	uint16_t eth_proto;/**< Ethernet type of encapsulated frame. */
} __attribute__((__packed__));



/* Ethernet frame types */
#define RTE_ETHER_TYPE_IPV4 0x0800 /**< IPv4 Protocol. */
#define RTE_ETHER_TYPE_IPV6 0x86DD /**< IPv6 Protocol. */
#define RTE_ETHER_TYPE_ARP  0x0806 /**< Arp Protocol. */
#define RTE_ETHER_TYPE_RARP 0x8035 /**< Reverse Arp Protocol. */
#define RTE_ETHER_TYPE_VLAN 0x8100 /**< IEEE 802.1Q VLAN tagging. */
#define RTE_ETHER_TYPE_QINQ 0x88A8 /**< IEEE 802.1ad QinQ tagging. */
#define RTE_ETHER_TYPE_PPPOE_DISCOVERY 0x8863 /**< PPPoE Discovery Stage. */
#define RTE_ETHER_TYPE_PPPOE_SESSION 0x8864 /**< PPPoE Session Stage. */
#define RTE_ETHER_TYPE_ETAG 0x893F /**< IEEE 802.1BR E-Tag. */
#define RTE_ETHER_TYPE_1588 0x88F7
	/**< IEEE 802.1AS 1588 Precise Time Protocol. */
#define RTE_ETHER_TYPE_SLOW 0x8809 /**< Slow protocols (LACP and Marker). */
#define RTE_ETHER_TYPE_TEB  0x6558 /**< Transparent Ethernet Bridging. */
#define RTE_ETHER_TYPE_LLDP 0x88CC /**< LLDP Protocol. */
#define RTE_ETHER_TYPE_MPLS 0x8847 /**< MPLS ethertype. */
#define RTE_ETHER_TYPE_MPLSM 0x8848 /**< MPLS multicast ethertype. */

/**
 * Extract VLAN tag information into mbuf
 *
 * Software version of VLAN stripping
 *
 * @param m
 *   The packet mbuf.
 * @return
 *   - 0: Success
 *   - 1: not a vlan packet
 */
static inline int rte_vlan_strip(struct rte_mbuf *m)
{
	struct rte_ether_hdr *eh
		 = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
	struct rte_vlan_hdr *vh;

	if (eh->ether_type != rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN))
		return -1;

	vh = (struct rte_vlan_hdr *)(eh + 1);
	m->ol_flags |= PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED;
	m->vlan_tci = rte_be_to_cpu_16(vh->vlan_tci);

	/* Copy ether header over rather than moving whole packet */
	memmove(rte_pktmbuf_adj(m, sizeof(struct rte_vlan_hdr)),
		eh, 2 * RTE_ETHER_ADDR_LEN);

	return 0;
}

/**
 * Insert VLAN tag into mbuf.
 *
 * Software version of VLAN unstripping
 *
 * @param m
 *   The packet mbuf.
 * @return
 *   - 0: On success
 *   -EPERM: mbuf is is shared overwriting would be unsafe
 *   -ENOSPC: not enough headroom in mbuf
 */
static inline int rte_vlan_insert(struct rte_mbuf **m)
{
	struct rte_ether_hdr *oh, *nh;
	struct rte_vlan_hdr *vh;

	/* Can't insert header if mbuf is shared */
	if (!RTE_MBUF_DIRECT(*m) || rte_mbuf_refcnt_read(*m) > 1)
		return -EINVAL;

	oh = rte_pktmbuf_mtod(*m, struct rte_ether_hdr *);
	nh = (struct rte_ether_hdr *)
		rte_pktmbuf_prepend(*m, sizeof(struct rte_vlan_hdr));
	if (nh == NULL)
		return -ENOSPC;

	memmove(nh, oh, 2 * RTE_ETHER_ADDR_LEN);
	nh->ether_type = rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN);

	vh = (struct rte_vlan_hdr *) (nh + 1);
	vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);

	(*m)->ol_flags &= ~(PKT_RX_VLAN_STRIPPED | PKT_TX_VLAN);

	if ((*m)->ol_flags & PKT_TX_TUNNEL_MASK)
		(*m)->outer_l2_len += sizeof(struct rte_vlan_hdr);
	else
		(*m)->l2_len += sizeof(struct rte_vlan_hdr);

	return 0;
}

#ifdef __cplusplus
}
#endif

#endif /* _RTE_ETHER_H_ */