include/net/eth.h - third_party/qemu - Git at Google

 /*
  * QEMU network structures definitions and helper functions
  *
  * Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
  *
  * Developed by Daynix Computing LTD (http://www.daynix.com)
  *
  * Portions developed by Free Software Foundation, Inc
  * Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc.
  * See netinet/ip6.h and netinet/in.h (GNU C Library)
  *
  * Portions developed by Igor Kovalenko
  * Copyright (c) 2006 Igor Kovalenko
  * See hw/rtl8139.c (QEMU)
  *
  * Authors:
  * Dmitry Fleytman <dmitry@daynix.com>
  * Tamir Shomer <tamirs@daynix.com>
  * Yan Vugenfirer <yan@daynix.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  * See the COPYING file in the top-level directory.
  *
  */

 #ifndef QEMU_ETH_H
 #define QEMU_ETH_H

 #include "qemu/bswap.h"
 #include "qemu/iov.h"

 #define ETH_ALEN 6
 #define ETH_HLEN 14

 struct eth_header {
     uint8_t  h_dest[ETH_ALEN];   /* destination eth addr */
     uint8_t  h_source[ETH_ALEN]; /* source ether addr    */
     uint16_t h_proto;            /* packet type ID field */
 };

 struct vlan_header {
     uint16_t  h_tci;     /* priority and VLAN ID  */
     uint16_t  h_proto;   /* encapsulated protocol */
 };

 struct ip_header {
     uint8_t  ip_ver_len;     /* version and header length */
     uint8_t  ip_tos;         /* type of service */
     uint16_t ip_len;         /* total length */
     uint16_t ip_id;          /* identification */
     uint16_t ip_off;         /* fragment offset field */
     uint8_t  ip_ttl;         /* time to live */
     uint8_t  ip_p;           /* protocol */
     uint16_t ip_sum;         /* checksum */
     uint32_t ip_src, ip_dst; /* source and destination address */
 };

 typedef struct tcp_header {
     uint16_t th_sport;          /* source port */
     uint16_t th_dport;          /* destination port */
     uint32_t th_seq;            /* sequence number */
     uint32_t th_ack;            /* acknowledgment number */
     uint16_t th_offset_flags;   /* data offset, reserved 6 bits, */
                                 /* TCP protocol flags */
     uint16_t th_win;            /* window */
     uint16_t th_sum;            /* checksum */
     uint16_t th_urp;            /* urgent pointer */
 } tcp_header;

 #define TCP_FLAGS_ONLY(flags) ((flags) & 0x3f)

 #define TCP_HEADER_FLAGS(tcp) \
     TCP_FLAGS_ONLY(be16_to_cpu((tcp)->th_offset_flags))

 #define TCP_FLAG_ACK  0x10

 #define TCP_HEADER_DATA_OFFSET(tcp) \
     (((be16_to_cpu((tcp)->th_offset_flags) >> 12) & 0xf) << 2)

 typedef struct udp_header {
     uint16_t uh_sport; /* source port */
     uint16_t uh_dport; /* destination port */
     uint16_t uh_ulen;  /* udp length */
     uint16_t uh_sum;   /* udp checksum */
 } udp_header;

 typedef struct ip_pseudo_header {
     uint32_t ip_src;
     uint32_t ip_dst;
     uint8_t  zeros;
     uint8_t  ip_proto;
     uint16_t ip_payload;
 } ip_pseudo_header;

 /* IPv6 address */
 struct in6_address {
     union {
         uint8_t __u6_addr8[16];
     } __in6_u;
 };

 struct ip6_header {
     union {
         struct ip6_hdrctl {
             uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC,
                                       20 bits flow-ID */
             uint16_t ip6_un1_plen; /* payload length */
             uint8_t  ip6_un1_nxt;  /* next header */
             uint8_t  ip6_un1_hlim; /* hop limit */
         } ip6_un1;
         uint8_t ip6_un2_vfc;       /* 4 bits version, top 4 bits tclass */
         struct ip6_ecn_access {
             uint8_t  ip6_un3_vfc;  /* 4 bits version, top 4 bits tclass */
             uint8_t  ip6_un3_ecn;  /* 2 bits ECN, top 6 bits payload length */
         } ip6_un3;
     } ip6_ctlun;
     struct in6_address ip6_src;    /* source address */
     struct in6_address ip6_dst;    /* destination address */
 };

 typedef struct ip6_pseudo_header {
     struct in6_address ip6_src;
     struct in6_address ip6_dst;
     uint32_t           len;
     uint8_t            zero[3];
     uint8_t            next_hdr;
 } ip6_pseudo_header;

 struct ip6_ext_hdr {
     uint8_t        ip6r_nxt;   /* next header */
     uint8_t        ip6r_len;   /* length in units of 8 octets */
 };

 struct ip6_ext_hdr_routing {
     uint8_t     nxt;
     uint8_t     len;
     uint8_t     rtype;
     uint8_t     segleft;
     uint8_t     rsvd[4];
 };

 struct ip6_option_hdr {
 #define IP6_OPT_PAD1   (0x00)
 #define IP6_OPT_HOME   (0xC9)
     uint8_t type;
     uint8_t len;
 };

 struct udp_hdr {
   uint16_t uh_sport;           /* source port */
   uint16_t uh_dport;           /* destination port */
   uint16_t uh_ulen;            /* udp length */
   uint16_t uh_sum;             /* udp checksum */
 };

 struct tcp_hdr {
     u_short     th_sport;   /* source port */
     u_short     th_dport;   /* destination port */
     uint32_t    th_seq;     /* sequence number */
     uint32_t    th_ack;     /* acknowledgment number */
 #ifdef HOST_WORDS_BIGENDIAN
     u_char  th_off : 4,     /* data offset */
         th_x2:4;            /* (unused) */
 #else
     u_char  th_x2 : 4,      /* (unused) */
         th_off:4;           /* data offset */
 #endif

 #define TH_ELN  0x1 /* explicit loss notification */
 #define TH_ECN  0x2 /* explicit congestion notification */
 #define TH_FS   0x4 /* fast start */

     u_char  th_flags;
 #define TH_FIN  0x01
 #define TH_SYN  0x02
 #define TH_RST  0x04
 #define TH_PUSH 0x08
 #define TH_ACK  0x10
 #define TH_URG  0x20
 #define TH_ECE  0x40
 #define TH_CWR  0x80
     u_short th_win;      /* window */
     u_short th_sum;      /* checksum */
     u_short th_urp;      /* urgent pointer */
 };

 #define ip6_nxt      ip6_ctlun.ip6_un1.ip6_un1_nxt
 #define ip6_ecn_acc  ip6_ctlun.ip6_un3.ip6_un3_ecn

 #define PKT_GET_ETH_HDR(p)        \
     ((struct eth_header *)(p))
 #define PKT_GET_VLAN_HDR(p)       \
     ((struct vlan_header *) (((uint8_t *)(p)) + sizeof(struct eth_header)))
 #define PKT_GET_DVLAN_HDR(p)       \
     (PKT_GET_VLAN_HDR(p) + 1)
 #define PKT_GET_IP_HDR(p)         \
     ((struct ip_header *)(((uint8_t *)(p)) + eth_get_l2_hdr_length(p)))
 #define IP_HDR_GET_LEN(p)         \
     ((ldub_p(p + offsetof(struct ip_header, ip_ver_len)) & 0x0F) << 2)
 #define IP_HDR_GET_P(p)                                           \
     (ldub_p(p + offsetof(struct ip_header, ip_p)))
 #define PKT_GET_IP_HDR_LEN(p)     \
     (IP_HDR_GET_LEN(PKT_GET_IP_HDR(p)))
 #define PKT_GET_IP6_HDR(p)        \
     ((struct ip6_header *) (((uint8_t *)(p)) + eth_get_l2_hdr_length(p)))
 #define IP_HEADER_VERSION(ip)     \
     (((ip)->ip_ver_len >> 4) & 0xf)
 #define IP4_IS_FRAGMENT(ip) \
     ((be16_to_cpu((ip)->ip_off) & (IP_OFFMASK | IP_MF)) != 0)

 #define ETH_P_IP                  (0x0800)      /* Internet Protocol packet  */
 #define ETH_P_ARP                 (0x0806)      /* Address Resolution packet */
 #define ETH_P_IPV6                (0x86dd)
 #define ETH_P_VLAN                (0x8100)
 #define ETH_P_DVLAN               (0x88a8)
 #define ETH_P_NCSI                (0x88f8)
 #define ETH_P_UNKNOWN             (0xffff)
 #define VLAN_VID_MASK             0x0fff
 #define IP_HEADER_VERSION_4       (4)
 #define IP_HEADER_VERSION_6       (6)
 #define IP_PROTO_TCP              (6)
 #define IP_PROTO_UDP              (17)
 #define IPTOS_ECN_MASK            0x03
 #define IPTOS_ECN(x)              ((x) & IPTOS_ECN_MASK)
 #define IPTOS_ECN_CE              0x03
 #define IP6_ECN_MASK              0xC0
 #define IP6_ECN(x)                ((x) & IP6_ECN_MASK)
 #define IP6_ECN_CE                0xC0
 #define IP4_DONT_FRAGMENT_FLAG    (1 << 14)

 #define IS_SPECIAL_VLAN_ID(x)     \
     (((x) == 0) || ((x) == 0xFFF))

 #define ETH_MAX_L2_HDR_LEN  \
     (sizeof(struct eth_header) + 2 * sizeof(struct vlan_header))

 #define ETH_MAX_IP4_HDR_LEN   (60)
 #define ETH_MAX_IP_DGRAM_LEN  (0xFFFF)

 #define IP_FRAG_UNIT_SIZE     (8)
 #define IP_FRAG_ALIGN_SIZE(x) ((x) & ~0x7)
 #define IP_RF                 0x8000           /* reserved fragment flag */
 #define IP_DF                 0x4000           /* don't fragment flag */
 #define IP_MF                 0x2000           /* more fragments flag */
 #define IP_OFFMASK            0x1fff           /* mask for fragmenting bits */

 #define IP6_EXT_GRANULARITY   (8)  /* Size granularity for
                                       IPv6 extension headers */

 /* IP6 extension header types */
 #define IP6_HOP_BY_HOP        (0)
 #define IP6_ROUTING           (43)
 #define IP6_FRAGMENT          (44)
 #define IP6_ESP               (50)
 #define IP6_AUTHENTICATION    (51)
 #define IP6_NONE              (59)
 #define IP6_DESTINATON        (60)
 #define IP6_MOBILITY          (135)

 static inline int is_multicast_ether_addr(const uint8_t *addr)
 {
     return 0x01 & addr[0];
 }

 static inline int is_broadcast_ether_addr(const uint8_t *addr)
 {
     return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff;
 }

 static inline int is_unicast_ether_addr(const uint8_t *addr)
 {
     return !is_multicast_ether_addr(addr);
 }

 typedef enum {
     ETH_PKT_UCAST = 0xAABBCC00,
     ETH_PKT_BCAST,
     ETH_PKT_MCAST
 } eth_pkt_types_e;

 static inline eth_pkt_types_e
 get_eth_packet_type(const struct eth_header *ehdr)
 {
     if (is_broadcast_ether_addr(ehdr->h_dest)) {
         return ETH_PKT_BCAST;
     } else if (is_multicast_ether_addr(ehdr->h_dest)) {
         return ETH_PKT_MCAST;
     } else { /* unicast */
         return ETH_PKT_UCAST;
     }
 }

 static inline uint32_t
 eth_get_l2_hdr_length(const void *p)
 {
     uint16_t proto = be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto);
     struct vlan_header *hvlan = PKT_GET_VLAN_HDR(p);
     switch (proto) {
     case ETH_P_VLAN:
         return sizeof(struct eth_header) + sizeof(struct vlan_header);
     case ETH_P_DVLAN:
         if (be16_to_cpu(hvlan->h_proto) == ETH_P_VLAN) {
             return sizeof(struct eth_header) + 2 * sizeof(struct vlan_header);
         } else {
             return sizeof(struct eth_header) + sizeof(struct vlan_header);
         }
     default:
         return sizeof(struct eth_header);
     }
 }

 static inline uint32_t
 eth_get_l2_hdr_length_iov(const struct iovec *iov, int iovcnt)
 {
     uint8_t p[sizeof(struct eth_header) + sizeof(struct vlan_header)];
     size_t copied = iov_to_buf(iov, iovcnt, 0, p, ARRAY_SIZE(p));

     if (copied < ARRAY_SIZE(p)) {
         return copied;
     }

     return eth_get_l2_hdr_length(p);
 }

 static inline uint16_t
 eth_get_pkt_tci(const void *p)
 {
     uint16_t proto = be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto);
     struct vlan_header *hvlan = PKT_GET_VLAN_HDR(p);
     switch (proto) {
     case ETH_P_VLAN:
     case ETH_P_DVLAN:
         return be16_to_cpu(hvlan->h_tci);
     default:
         return 0;
     }
 }

 size_t
 eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
                uint8_t *new_ehdr_buf,
                uint16_t *payload_offset, uint16_t *tci);

 size_t
 eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
                   uint16_t vet, uint8_t *new_ehdr_buf,
                   uint16_t *payload_offset, uint16_t *tci);

 uint16_t
 eth_get_l3_proto(const struct iovec *l2hdr_iov, int iovcnt, size_t l2hdr_len);

 void eth_setup_vlan_headers_ex(struct eth_header *ehdr, uint16_t vlan_tag,
     uint16_t vlan_ethtype, bool *is_new);

 static inline void
 eth_setup_vlan_headers(struct eth_header *ehdr, uint16_t vlan_tag,
     bool *is_new)
 {
     eth_setup_vlan_headers_ex(ehdr, vlan_tag, ETH_P_VLAN, is_new);
 }


 uint8_t eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto);

 typedef struct eth_ip6_hdr_info_st {
     uint8_t l4proto;
     size_t  full_hdr_len;
     struct  ip6_header ip6_hdr;
     bool    has_ext_hdrs;
     bool    rss_ex_src_valid;
     struct  in6_address rss_ex_src;
     bool    rss_ex_dst_valid;
     struct  in6_address rss_ex_dst;
     bool    fragment;
 } eth_ip6_hdr_info;

 typedef struct eth_ip4_hdr_info_st {
     struct ip_header ip4_hdr;
     bool   fragment;
 } eth_ip4_hdr_info;

 typedef struct eth_l4_hdr_info_st {
     union {
         struct tcp_header tcp;
         struct udp_header udp;
     } hdr;

     bool has_tcp_data;
 } eth_l4_hdr_info;

 void eth_get_protocols(const struct iovec *iov, int iovcnt,
                        bool *isip4, bool *isip6,
                        bool *isudp, bool *istcp,
                        size_t *l3hdr_off,
                        size_t *l4hdr_off,
                        size_t *l5hdr_off,
                        eth_ip6_hdr_info *ip6hdr_info,
                        eth_ip4_hdr_info *ip4hdr_info,
                        eth_l4_hdr_info  *l4hdr_info);

 void eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len,
                                  void *l3hdr, size_t l3hdr_len,
                                  size_t l3payload_len,
                                  size_t frag_offset, bool more_frags);

 void
 eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len);

 uint32_t
 eth_calc_ip4_pseudo_hdr_csum(struct ip_header *iphdr,
                              uint16_t csl,
                              uint32_t *cso);

 uint32_t
 eth_calc_ip6_pseudo_hdr_csum(struct ip6_header *iphdr,
                              uint16_t csl,
                              uint8_t l4_proto,
                              uint32_t *cso);

 bool
 eth_parse_ipv6_hdr(const struct iovec *pkt, int pkt_frags,
                    size_t ip6hdr_off, eth_ip6_hdr_info *info);

 #endif
	/*
	* QEMU network structures definitions and helper functions
	*
	* Copyright (c) 2012 Ravello Systems LTD (http://ravellosystems.com)
	*
	* Developed by Daynix Computing LTD (http://www.daynix.com)
	*
	* Portions developed by Free Software Foundation, Inc
	* Copyright (C) 1991-1997, 2001, 2003, 2006 Free Software Foundation, Inc.
	* See netinet/ip6.h and netinet/in.h (GNU C Library)
	*
	* Portions developed by Igor Kovalenko
	* Copyright (c) 2006 Igor Kovalenko
	* See hw/rtl8139.c (QEMU)
	*
	* Authors:
	* Dmitry Fleytman <dmitry@daynix.com>
	* Tamir Shomer <tamirs@daynix.com>
	* Yan Vugenfirer <yan@daynix.com>
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or later.
	* See the COPYING file in the top-level directory.
	*
	*/

	#ifndef QEMU_ETH_H
	#define QEMU_ETH_H

	#include "qemu/bswap.h"
	#include "qemu/iov.h"

	#define ETH_ALEN 6
	#define ETH_HLEN 14

	struct eth_header {
	uint8_t h_dest[ETH_ALEN]; /* destination eth addr */
	uint8_t h_source[ETH_ALEN]; /* source ether addr */
	uint16_t h_proto; /* packet type ID field */
	};

	struct vlan_header {
	uint16_t h_tci; /* priority and VLAN ID */
	uint16_t h_proto; /* encapsulated protocol */
	};

	struct ip_header {
	uint8_t ip_ver_len; /* version and header length */
	uint8_t ip_tos; /* type of service */
	uint16_t ip_len; /* total length */
	uint16_t ip_id; /* identification */
	uint16_t ip_off; /* fragment offset field */
	uint8_t ip_ttl; /* time to live */
	uint8_t ip_p; /* protocol */
	uint16_t ip_sum; /* checksum */
	uint32_t ip_src, ip_dst; /* source and destination address */
	};

	typedef struct tcp_header {
	uint16_t th_sport; /* source port */
	uint16_t th_dport; /* destination port */
	uint32_t th_seq; /* sequence number */
	uint32_t th_ack; /* acknowledgment number */
	uint16_t th_offset_flags; /* data offset, reserved 6 bits, */
	/* TCP protocol flags */
	uint16_t th_win; /* window */
	uint16_t th_sum; /* checksum */
	uint16_t th_urp; /* urgent pointer */
	} tcp_header;

	#define TCP_FLAGS_ONLY(flags) ((flags) & 0x3f)

	#define TCP_HEADER_FLAGS(tcp) \
	TCP_FLAGS_ONLY(be16_to_cpu((tcp)->th_offset_flags))

	#define TCP_FLAG_ACK 0x10

	#define TCP_HEADER_DATA_OFFSET(tcp) \
	(((be16_to_cpu((tcp)->th_offset_flags) >> 12) & 0xf) << 2)

	typedef struct udp_header {
	uint16_t uh_sport; /* source port */
	uint16_t uh_dport; /* destination port */
	uint16_t uh_ulen; /* udp length */
	uint16_t uh_sum; /* udp checksum */
	} udp_header;

	typedef struct ip_pseudo_header {
	uint32_t ip_src;
	uint32_t ip_dst;
	uint8_t zeros;
	uint8_t ip_proto;
	uint16_t ip_payload;
	} ip_pseudo_header;

	/* IPv6 address */
	struct in6_address {
	union {
	uint8_t __u6_addr8[16];
	} __in6_u;
	};

	struct ip6_header {
	union {
	struct ip6_hdrctl {
	uint32_t ip6_un1_flow; /* 4 bits version, 8 bits TC,
	20 bits flow-ID */
	uint16_t ip6_un1_plen; /* payload length */
	uint8_t ip6_un1_nxt; /* next header */
	uint8_t ip6_un1_hlim; /* hop limit */
	} ip6_un1;
	uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits tclass */
	struct ip6_ecn_access {
	uint8_t ip6_un3_vfc; /* 4 bits version, top 4 bits tclass */
	uint8_t ip6_un3_ecn; /* 2 bits ECN, top 6 bits payload length */
	} ip6_un3;
	} ip6_ctlun;
	struct in6_address ip6_src; /* source address */
	struct in6_address ip6_dst; /* destination address */
	};

	typedef struct ip6_pseudo_header {
	struct in6_address ip6_src;
	struct in6_address ip6_dst;
	uint32_t len;
	uint8_t zero[3];
	uint8_t next_hdr;
	} ip6_pseudo_header;

	struct ip6_ext_hdr {
	uint8_t ip6r_nxt; /* next header */
	uint8_t ip6r_len; /* length in units of 8 octets */
	};

	struct ip6_ext_hdr_routing {
	uint8_t nxt;
	uint8_t len;
	uint8_t rtype;
	uint8_t segleft;
	uint8_t rsvd[4];
	};

	struct ip6_option_hdr {
	#define IP6_OPT_PAD1 (0x00)
	#define IP6_OPT_HOME (0xC9)
	uint8_t type;
	uint8_t len;
	};

	struct udp_hdr {
	uint16_t uh_sport; /* source port */
	uint16_t uh_dport; /* destination port */
	uint16_t uh_ulen; /* udp length */
	uint16_t uh_sum; /* udp checksum */
	};

	struct tcp_hdr {
	u_short th_sport; /* source port */
	u_short th_dport; /* destination port */
	uint32_t th_seq; /* sequence number */
	uint32_t th_ack; /* acknowledgment number */
	#ifdef HOST_WORDS_BIGENDIAN
	u_char th_off : 4, /* data offset */
	th_x2:4; /* (unused) */
	#else
	u_char th_x2 : 4, /* (unused) */
	th_off:4; /* data offset */
	#endif

	#define TH_ELN 0x1 /* explicit loss notification */
	#define TH_ECN 0x2 /* explicit congestion notification */
	#define TH_FS 0x4 /* fast start */

	u_char th_flags;
	#define TH_FIN 0x01
	#define TH_SYN 0x02
	#define TH_RST 0x04
	#define TH_PUSH 0x08
	#define TH_ACK 0x10
	#define TH_URG 0x20
	#define TH_ECE 0x40
	#define TH_CWR 0x80
	u_short th_win; /* window */
	u_short th_sum; /* checksum */
	u_short th_urp; /* urgent pointer */
	};

	#define ip6_nxt ip6_ctlun.ip6_un1.ip6_un1_nxt
	#define ip6_ecn_acc ip6_ctlun.ip6_un3.ip6_un3_ecn

	#define PKT_GET_ETH_HDR(p) \
	((struct eth_header *)(p))
	#define PKT_GET_VLAN_HDR(p) \
	((struct vlan_header ) (((uint8_t )(p)) + sizeof(struct eth_header)))
	#define PKT_GET_DVLAN_HDR(p) \
	(PKT_GET_VLAN_HDR(p) + 1)
	#define PKT_GET_IP_HDR(p) \
	((struct ip_header )(((uint8_t )(p)) + eth_get_l2_hdr_length(p)))
	#define IP_HDR_GET_LEN(p) \
	((ldub_p(p + offsetof(struct ip_header, ip_ver_len)) & 0x0F) << 2)
	#define IP_HDR_GET_P(p) \
	(ldub_p(p + offsetof(struct ip_header, ip_p)))
	#define PKT_GET_IP_HDR_LEN(p) \
	(IP_HDR_GET_LEN(PKT_GET_IP_HDR(p)))
	#define PKT_GET_IP6_HDR(p) \
	((struct ip6_header ) (((uint8_t )(p)) + eth_get_l2_hdr_length(p)))
	#define IP_HEADER_VERSION(ip) \
	(((ip)->ip_ver_len >> 4) & 0xf)
	#define IP4_IS_FRAGMENT(ip) \
	((be16_to_cpu((ip)->ip_off) & (IP_OFFMASK \| IP_MF)) != 0)

	#define ETH_P_IP (0x0800) /* Internet Protocol packet */
	#define ETH_P_ARP (0x0806) /* Address Resolution packet */
	#define ETH_P_IPV6 (0x86dd)
	#define ETH_P_VLAN (0x8100)
	#define ETH_P_DVLAN (0x88a8)
	#define ETH_P_NCSI (0x88f8)
	#define ETH_P_UNKNOWN (0xffff)
	#define VLAN_VID_MASK 0x0fff
	#define IP_HEADER_VERSION_4 (4)
	#define IP_HEADER_VERSION_6 (6)
	#define IP_PROTO_TCP (6)
	#define IP_PROTO_UDP (17)
	#define IPTOS_ECN_MASK 0x03
	#define IPTOS_ECN(x) ((x) & IPTOS_ECN_MASK)
	#define IPTOS_ECN_CE 0x03
	#define IP6_ECN_MASK 0xC0
	#define IP6_ECN(x) ((x) & IP6_ECN_MASK)
	#define IP6_ECN_CE 0xC0
	#define IP4_DONT_FRAGMENT_FLAG (1 << 14)

	#define IS_SPECIAL_VLAN_ID(x) \
	(((x) == 0) \|\| ((x) == 0xFFF))

	#define ETH_MAX_L2_HDR_LEN \
	(sizeof(struct eth_header) + 2 * sizeof(struct vlan_header))

	#define ETH_MAX_IP4_HDR_LEN (60)
	#define ETH_MAX_IP_DGRAM_LEN (0xFFFF)

	#define IP_FRAG_UNIT_SIZE (8)
	#define IP_FRAG_ALIGN_SIZE(x) ((x) & ~0x7)
	#define IP_RF 0x8000 /* reserved fragment flag */
	#define IP_DF 0x4000 /* don't fragment flag */
	#define IP_MF 0x2000 /* more fragments flag */
	#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */

	#define IP6_EXT_GRANULARITY (8) /* Size granularity for
	IPv6 extension headers */

	/* IP6 extension header types */
	#define IP6_HOP_BY_HOP (0)
	#define IP6_ROUTING (43)
	#define IP6_FRAGMENT (44)
	#define IP6_ESP (50)
	#define IP6_AUTHENTICATION (51)
	#define IP6_NONE (59)
	#define IP6_DESTINATON (60)
	#define IP6_MOBILITY (135)

	static inline int is_multicast_ether_addr(const uint8_t *addr)
	{
	return 0x01 & addr[0];
	}

	static inline int is_broadcast_ether_addr(const uint8_t *addr)
	{
	return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) == 0xff;
	}

	static inline int is_unicast_ether_addr(const uint8_t *addr)
	{
	return !is_multicast_ether_addr(addr);
	}

	typedef enum {
	ETH_PKT_UCAST = 0xAABBCC00,
	ETH_PKT_BCAST,
	ETH_PKT_MCAST
	} eth_pkt_types_e;

	static inline eth_pkt_types_e
	get_eth_packet_type(const struct eth_header *ehdr)
	{
	if (is_broadcast_ether_addr(ehdr->h_dest)) {
	return ETH_PKT_BCAST;
	} else if (is_multicast_ether_addr(ehdr->h_dest)) {
	return ETH_PKT_MCAST;
	} else { /* unicast */
	return ETH_PKT_UCAST;
	}
	}

	static inline uint32_t
	eth_get_l2_hdr_length(const void *p)
	{
	uint16_t proto = be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto);
	struct vlan_header *hvlan = PKT_GET_VLAN_HDR(p);
	switch (proto) {
	case ETH_P_VLAN:
	return sizeof(struct eth_header) + sizeof(struct vlan_header);
	case ETH_P_DVLAN:
	if (be16_to_cpu(hvlan->h_proto) == ETH_P_VLAN) {
	return sizeof(struct eth_header) + 2 * sizeof(struct vlan_header);
	} else {
	return sizeof(struct eth_header) + sizeof(struct vlan_header);
	}
	default:
	return sizeof(struct eth_header);
	}
	}

	static inline uint32_t
	eth_get_l2_hdr_length_iov(const struct iovec *iov, int iovcnt)
	{
	uint8_t p[sizeof(struct eth_header) + sizeof(struct vlan_header)];
	size_t copied = iov_to_buf(iov, iovcnt, 0, p, ARRAY_SIZE(p));

	if (copied < ARRAY_SIZE(p)) {
	return copied;
	}

	return eth_get_l2_hdr_length(p);
	}

	static inline uint16_t
	eth_get_pkt_tci(const void *p)
	{
	uint16_t proto = be16_to_cpu(PKT_GET_ETH_HDR(p)->h_proto);
	struct vlan_header *hvlan = PKT_GET_VLAN_HDR(p);
	switch (proto) {
	case ETH_P_VLAN:
	case ETH_P_DVLAN:
	return be16_to_cpu(hvlan->h_tci);
	default:
	return 0;
	}
	}

	size_t
	eth_strip_vlan(const struct iovec *iov, int iovcnt, size_t iovoff,
	uint8_t *new_ehdr_buf,
	uint16_t payload_offset, uint16_t tci);

	size_t
	eth_strip_vlan_ex(const struct iovec *iov, int iovcnt, size_t iovoff,
	uint16_t vet, uint8_t *new_ehdr_buf,
	uint16_t payload_offset, uint16_t tci);

	uint16_t
	eth_get_l3_proto(const struct iovec *l2hdr_iov, int iovcnt, size_t l2hdr_len);

	void eth_setup_vlan_headers_ex(struct eth_header *ehdr, uint16_t vlan_tag,
	uint16_t vlan_ethtype, bool *is_new);

	static inline void
	eth_setup_vlan_headers(struct eth_header *ehdr, uint16_t vlan_tag,
	bool *is_new)
	{
	eth_setup_vlan_headers_ex(ehdr, vlan_tag, ETH_P_VLAN, is_new);
	}


	uint8_t eth_get_gso_type(uint16_t l3_proto, uint8_t *l3_hdr, uint8_t l4proto);

	typedef struct eth_ip6_hdr_info_st {
	uint8_t l4proto;
	size_t full_hdr_len;
	struct ip6_header ip6_hdr;
	bool has_ext_hdrs;
	bool rss_ex_src_valid;
	struct in6_address rss_ex_src;
	bool rss_ex_dst_valid;
	struct in6_address rss_ex_dst;
	bool fragment;
	} eth_ip6_hdr_info;

	typedef struct eth_ip4_hdr_info_st {
	struct ip_header ip4_hdr;
	bool fragment;
	} eth_ip4_hdr_info;

	typedef struct eth_l4_hdr_info_st {
	union {
	struct tcp_header tcp;
	struct udp_header udp;
	} hdr;

	bool has_tcp_data;
	} eth_l4_hdr_info;

	void eth_get_protocols(const struct iovec *iov, int iovcnt,
	bool isip4, bool isip6,
	bool isudp, bool istcp,
	size_t *l3hdr_off,
	size_t *l4hdr_off,
	size_t *l5hdr_off,
	eth_ip6_hdr_info *ip6hdr_info,
	eth_ip4_hdr_info *ip4hdr_info,
	eth_l4_hdr_info *l4hdr_info);

	void eth_setup_ip4_fragmentation(const void *l2hdr, size_t l2hdr_len,
	void *l3hdr, size_t l3hdr_len,
	size_t l3payload_len,
	size_t frag_offset, bool more_frags);

	void
	eth_fix_ip4_checksum(void *l3hdr, size_t l3hdr_len);

	uint32_t
	eth_calc_ip4_pseudo_hdr_csum(struct ip_header *iphdr,
	uint16_t csl,
	uint32_t *cso);

	uint32_t
	eth_calc_ip6_pseudo_hdr_csum(struct ip6_header *iphdr,
	uint16_t csl,
	uint8_t l4_proto,
	uint32_t *cso);

	bool
	eth_parse_ipv6_hdr(const struct iovec *pkt, int pkt_frags,
	size_t ip6hdr_off, eth_ip6_hdr_info *info);

	#endif