rte_ether.h

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/*-
 *   BSD LICENSE
 *
 *   Copyright(c) 2010-2014 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
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 *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RTE_ETHER_H_
#define _RTE_ETHER_H_

#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 ETHER_ADDR_LEN  6 
#define ETHER_TYPE_LEN  2 
#define ETHER_CRC_LEN   4 
#define ETHER_HDR_LEN   \
        (ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN) 
#define ETHER_MIN_LEN   64    
#define ETHER_MAX_LEN   1518  
#define ETHER_MTU       \
        (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) 
#define ETHER_MAX_VLAN_FRAME_LEN \
        (ETHER_MAX_LEN + 4) 
#define ETHER_MAX_JUMBO_FRAME_LEN \
        0x3F00 
#define ETHER_MAX_VLAN_ID  4095 
#define ETHER_MIN_MTU 68 
struct ether_addr {
        uint8_t addr_bytes[ETHER_ADDR_LEN]; 
} __attribute__((__packed__));

#define ETHER_LOCAL_ADMIN_ADDR 0x02 
#define ETHER_GROUP_ADDR       0x01 
static inline int is_same_ether_addr(const struct ether_addr *ea1,
                                     const struct ether_addr *ea2)
{
        int i;
        for (i = 0; i < ETHER_ADDR_LEN; i++)
                if (ea1->addr_bytes[i] != ea2->addr_bytes[i])
                        return 0;
        return 1;
}

static inline int is_zero_ether_addr(const struct ether_addr *ea)
{
        int i;
        for (i = 0; i < ETHER_ADDR_LEN; i++)
                if (ea->addr_bytes[i] != 0x00)
                        return 0;
        return 1;
}

static inline int is_unicast_ether_addr(const struct ether_addr *ea)
{
        return (ea->addr_bytes[0] & ETHER_GROUP_ADDR) == 0;
}

static inline int is_multicast_ether_addr(const struct ether_addr *ea)
{
        return ea->addr_bytes[0] & ETHER_GROUP_ADDR;
}

static inline int is_broadcast_ether_addr(const struct ether_addr *ea)
{
        const unaligned_uint16_t *ea_words = (const unaligned_uint16_t *)ea;

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

static inline int is_universal_ether_addr(const struct ether_addr *ea)
{
        return (ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) == 0;
}

static inline int is_local_admin_ether_addr(const struct ether_addr *ea)
{
        return (ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) != 0;
}

static inline int is_valid_assigned_ether_addr(const struct ether_addr *ea)
{
        return is_unicast_ether_addr(ea) && (!is_zero_ether_addr(ea));
}

static inline void eth_random_addr(uint8_t *addr)
{
        uint64_t rand = rte_rand();
        uint8_t *p = (uint8_t *)&rand;

        rte_memcpy(addr, p, ETHER_ADDR_LEN);
        addr[0] &= ~ETHER_GROUP_ADDR;       /* clear multicast bit */
        addr[0] |= ETHER_LOCAL_ADMIN_ADDR;  /* set local assignment bit */
}

static inline void ether_addr_copy(const struct ether_addr *ea_from,
                                   struct 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 ETHER_ADDR_FMT_SIZE         18

static inline void
ether_format_addr(char *buf, uint16_t size,
                  const struct ether_addr *eth_addr)
{
        snprintf(buf, size, "%02X:%02X:%02X:%02X:%02X:%02X",
                 eth_addr->addr_bytes[0],
                 eth_addr->addr_bytes[1],
                 eth_addr->addr_bytes[2],
                 eth_addr->addr_bytes[3],
                 eth_addr->addr_bytes[4],
                 eth_addr->addr_bytes[5]);
}

struct ether_hdr {
        struct ether_addr d_addr; 
        struct ether_addr s_addr; 
        uint16_t ether_type;      
} __attribute__((__packed__));

struct vlan_hdr {
        uint16_t vlan_tci; 
        uint16_t eth_proto;
} __attribute__((__packed__));

struct vxlan_hdr {
        uint32_t vx_flags; 
        uint32_t vx_vni;   
} __attribute__((__packed__));

/* Ethernet frame types */
#define ETHER_TYPE_IPv4 0x0800 
#define ETHER_TYPE_IPv6 0x86DD 
#define ETHER_TYPE_ARP  0x0806 
#define ETHER_TYPE_RARP 0x8035 
#define ETHER_TYPE_VLAN 0x8100 
#define ETHER_TYPE_QINQ 0x88A8 
#define ETHER_TYPE_1588 0x88F7 
#define ETHER_TYPE_SLOW 0x8809 
#define ETHER_TYPE_TEB  0x6558 
#define ETHER_VXLAN_HLEN (sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr))

static inline int rte_vlan_strip(struct rte_mbuf *m)
{
        struct ether_hdr *eh
                 = rte_pktmbuf_mtod(m, struct ether_hdr *);

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

        struct vlan_hdr *vh = (struct vlan_hdr *)(eh + 1);
        m->ol_flags |= PKT_RX_VLAN_PKT | 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 vlan_hdr)),
                eh, 2 * ETHER_ADDR_LEN);

        return 0;
}

static inline int rte_vlan_insert(struct rte_mbuf **m)
{
        struct ether_hdr *oh, *nh;
        struct vlan_hdr *vh;

        /* Can't insert header if mbuf is shared */
        if (rte_mbuf_refcnt_read(*m) > 1) {
                struct rte_mbuf *copy;

                copy = rte_pktmbuf_clone(*m, (*m)->pool);
                if (unlikely(copy == NULL))
                        return -ENOMEM;
                rte_pktmbuf_free(*m);
                *m = copy;
        }

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

        memmove(nh, oh, 2 * ETHER_ADDR_LEN);
        nh->ether_type = rte_cpu_to_be_16(ETHER_TYPE_VLAN);

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

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

        return 0;
}

#ifdef __cplusplus
}
#endif

#endif /* _RTE_ETHER_H_ */