ceph/src/spdk/dpdk/lib/librte_net/rte_ether.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation
   3  */
   4
   5 #ifndef _RTE_ETHER_H_
   6 #define _RTE_ETHER_H_
   7
   8 /**
   9  * @file
  10  *
  11  * Ethernet Helpers in RTE
  12  */
  13
  14 #ifdef __cplusplus
  15 extern "C" {
  16 #endif
  17
  18 #include <stdint.h>
  19 #include <stdio.h>
  20
  21 #include <rte_memcpy.h>
  22 #include <rte_random.h>
  23 #include <rte_mbuf.h>
  24 #include <rte_byteorder.h>
  25
  26 #define ETHER_ADDR_LEN  6 /**< Length of Ethernet address. */
  27 #define ETHER_TYPE_LEN  2 /**< Length of Ethernet type field. */
  28 #define ETHER_CRC_LEN   4 /**< Length of Ethernet CRC. */
  29 #define ETHER_HDR_LEN   \
  30         (ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN) /**< Length of Ethernet header. */
  31 #define ETHER_MIN_LEN   64    /**< Minimum frame len, including CRC. */
  32 #define ETHER_MAX_LEN   1518  /**< Maximum frame len, including CRC. */
  33 #define ETHER_MTU       \
  34         (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) /**< Ethernet MTU. */
  35
  36 #define ETHER_MAX_VLAN_FRAME_LEN \
  37         (ETHER_MAX_LEN + 4) /**< Maximum VLAN frame length, including CRC. */
  38
  39 #define ETHER_MAX_JUMBO_FRAME_LEN \
  40         0x3F00 /**< Maximum Jumbo frame length, including CRC. */
  41
  42 #define ETHER_MAX_VLAN_ID  4095 /**< Maximum VLAN ID. */
  43
  44 #define ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */
  45
  46 /**
  47  * Ethernet address:
  48  * A universally administered address is uniquely assigned to a device by its
  49  * manufacturer. The first three octets (in transmission order) contain the
  50  * Organizationally Unique Identifier (OUI). The following three (MAC-48 and
  51  * EUI-48) octets are assigned by that organization with the only constraint
  52  * of uniqueness.
  53  * A locally administered address is assigned to a device by a network
  54  * administrator and does not contain OUIs.
  55  * See http://standards.ieee.org/regauth/groupmac/tutorial.html
  56  */
  57 struct ether_addr {
  58         uint8_t addr_bytes[ETHER_ADDR_LEN]; /**< Addr bytes in tx order */
  59 } __attribute__((__packed__));
  60
  61 #define ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
  62 #define ETHER_GROUP_ADDR       0x01 /**< Multicast or broadcast Eth. address. */
  63
  64 /**
  65  * Check if two Ethernet addresses are the same.
  66  *
  67  * @param ea1
  68  *  A pointer to the first ether_addr structure containing
  69  *  the ethernet address.
  70  * @param ea2
  71  *  A pointer to the second ether_addr structure containing
  72  *  the ethernet address.
  73  *
  74  * @return
  75  *  True  (1) if the given two ethernet address are the same;
  76  *  False (0) otherwise.
  77  */
  78 static inline int is_same_ether_addr(const struct ether_addr *ea1,
  79                                      const struct ether_addr *ea2)
  80 {
  81         int i;
  82         for (i = 0; i < ETHER_ADDR_LEN; i++)
  83                 if (ea1->addr_bytes[i] != ea2->addr_bytes[i])
  84                         return 0;
  85         return 1;
  86 }
  87
  88 /**
  89  * Check if an Ethernet address is filled with zeros.
  90  *
  91  * @param ea
  92  *   A pointer to a ether_addr structure containing the ethernet address
  93  *   to check.
  94  * @return
  95  *   True  (1) if the given ethernet address is filled with zeros;
  96  *   false (0) otherwise.
  97  */
  98 static inline int is_zero_ether_addr(const struct ether_addr *ea)
  99 {
 100         int i;
 101         for (i = 0; i < ETHER_ADDR_LEN; i++)
 102                 if (ea->addr_bytes[i] != 0x00)
 103                         return 0;
 104         return 1;
 105 }
 106
 107 /**
 108  * Check if an Ethernet address is a unicast address.
 109  *
 110  * @param ea
 111  *   A pointer to a ether_addr structure containing the ethernet address
 112  *   to check.
 113  * @return
 114  *   True  (1) if the given ethernet address is a unicast address;
 115  *   false (0) otherwise.
 116  */
 117 static inline int is_unicast_ether_addr(const struct ether_addr *ea)
 118 {
 119         return (ea->addr_bytes[0] & ETHER_GROUP_ADDR) == 0;
 120 }
 121
 122 /**
 123  * Check if an Ethernet address is a multicast address.
 124  *
 125  * @param ea
 126  *   A pointer to a ether_addr structure containing the ethernet address
 127  *   to check.
 128  * @return
 129  *   True  (1) if the given ethernet address is a multicast address;
 130  *   false (0) otherwise.
 131  */
 132 static inline int is_multicast_ether_addr(const struct ether_addr *ea)
 133 {
 134         return ea->addr_bytes[0] & ETHER_GROUP_ADDR;
 135 }
 136
 137 /**
 138  * Check if an Ethernet address is a broadcast address.
 139  *
 140  * @param ea
 141  *   A pointer to a ether_addr structure containing the ethernet address
 142  *   to check.
 143  * @return
 144  *   True  (1) if the given ethernet address is a broadcast address;
 145  *   false (0) otherwise.
 146  */
 147 static inline int is_broadcast_ether_addr(const struct ether_addr *ea)
 148 {
 149         const unaligned_uint16_t *ea_words = (const unaligned_uint16_t *)ea;
 150
 151         return (ea_words[0] == 0xFFFF && ea_words[1] == 0xFFFF &&
 152                 ea_words[2] == 0xFFFF);
 153 }
 154
 155 /**
 156  * Check if an Ethernet address is a universally assigned address.
 157  *
 158  * @param ea
 159  *   A pointer to a ether_addr structure containing the ethernet address
 160  *   to check.
 161  * @return
 162  *   True  (1) if the given ethernet address is a universally assigned address;
 163  *   false (0) otherwise.
 164  */
 165 static inline int is_universal_ether_addr(const struct ether_addr *ea)
 166 {
 167         return (ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) == 0;
 168 }
 169
 170 /**
 171  * Check if an Ethernet address is a locally assigned address.
 172  *
 173  * @param ea
 174  *   A pointer to a ether_addr structure containing the ethernet address
 175  *   to check.
 176  * @return
 177  *   True  (1) if the given ethernet address is a locally assigned address;
 178  *   false (0) otherwise.
 179  */
 180 static inline int is_local_admin_ether_addr(const struct ether_addr *ea)
 181 {
 182         return (ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) != 0;
 183 }
 184
 185 /**
 186  * Check if an Ethernet address is a valid address. Checks that the address is a
 187  * unicast address and is not filled with zeros.
 188  *
 189  * @param ea
 190  *   A pointer to a ether_addr structure containing the ethernet address
 191  *   to check.
 192  * @return
 193  *   True  (1) if the given ethernet address is valid;
 194  *   false (0) otherwise.
 195  */
 196 static inline int is_valid_assigned_ether_addr(const struct ether_addr *ea)
 197 {
 198         return is_unicast_ether_addr(ea) && (!is_zero_ether_addr(ea));
 199 }
 200
 201 /**
 202  * Generate a random Ethernet address that is locally administered
 203  * and not multicast.
 204  * @param addr
 205  *   A pointer to Ethernet address.
 206  */
 207 static inline void eth_random_addr(uint8_t *addr)
 208 {
 209         uint64_t rand = rte_rand();
 210         uint8_t *p = (uint8_t *)&rand;
 211
 212         rte_memcpy(addr, p, ETHER_ADDR_LEN);
 213         addr[0] &= (uint8_t)~ETHER_GROUP_ADDR;       /* clear multicast bit */
 214         addr[0] |= ETHER_LOCAL_ADMIN_ADDR;  /* set local assignment bit */
 215 }
 216
 217 /**
 218  * Fast copy an Ethernet address.
 219  *
 220  * @param ea_from
 221  *   A pointer to a ether_addr structure holding the Ethernet address to copy.
 222  * @param ea_to
 223  *   A pointer to a ether_addr structure where to copy the Ethernet address.
 224  */
 225 static inline void ether_addr_copy(const struct ether_addr *ea_from,
 226                                    struct ether_addr *ea_to)
 227 {
 228 #ifdef __INTEL_COMPILER
 229         uint16_t *from_words = (uint16_t *)(ea_from->addr_bytes);
 230         uint16_t *to_words   = (uint16_t *)(ea_to->addr_bytes);
 231
 232         to_words[0] = from_words[0];
 233         to_words[1] = from_words[1];
 234         to_words[2] = from_words[2];
 235 #else
 236         /*
 237          * Use the common way, because of a strange gcc warning.
 238          */
 239         *ea_to = *ea_from;
 240 #endif
 241 }
 242
 243 #define ETHER_ADDR_FMT_SIZE         18
 244 /**
 245  * Format 48bits Ethernet address in pattern xx:xx:xx:xx:xx:xx.
 246  *
 247  * @param buf
 248  *   A pointer to buffer contains the formatted MAC address.
 249  * @param size
 250  *   The format buffer size.
 251  * @param eth_addr
 252  *   A pointer to a ether_addr structure.
 253  */
 254 static inline void
 255 ether_format_addr(char *buf, uint16_t size,
 256                   const struct ether_addr *eth_addr)
 257 {
 258         snprintf(buf, size, "%02X:%02X:%02X:%02X:%02X:%02X",
 259                  eth_addr->addr_bytes[0],
 260                  eth_addr->addr_bytes[1],
 261                  eth_addr->addr_bytes[2],
 262                  eth_addr->addr_bytes[3],
 263                  eth_addr->addr_bytes[4],
 264                  eth_addr->addr_bytes[5]);
 265 }
 266
 267 /**
 268  * Ethernet header: Contains the destination address, source address
 269  * and frame type.
 270  */
 271 struct ether_hdr {
 272         struct ether_addr d_addr; /**< Destination address. */
 273         struct ether_addr s_addr; /**< Source address. */
 274         uint16_t ether_type;      /**< Frame type. */
 275 } __attribute__((__packed__));
 276
 277 /**
 278  * Ethernet VLAN Header.
 279  * Contains the 16-bit VLAN Tag Control Identifier and the Ethernet type
 280  * of the encapsulated frame.
 281  */
 282 struct vlan_hdr {
 283         uint16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
 284         uint16_t eth_proto;/**< Ethernet type of encapsulated frame. */
 285 } __attribute__((__packed__));
 286
 287 /**
 288  * VXLAN protocol header.
 289  * Contains the 8-bit flag, 24-bit VXLAN Network Identifier and
 290  * Reserved fields (24 bits and 8 bits)
 291  */
 292 struct vxlan_hdr {
 293         uint32_t vx_flags; /**< flag (8) + Reserved (24). */
 294         uint32_t vx_vni;   /**< VNI (24) + Reserved (8). */
 295 } __attribute__((__packed__));
 296
 297 /* Ethernet frame types */
 298 #define ETHER_TYPE_IPv4 0x0800 /**< IPv4 Protocol. */
 299 #define ETHER_TYPE_IPv6 0x86DD /**< IPv6 Protocol. */
 300 #define ETHER_TYPE_ARP  0x0806 /**< Arp Protocol. */
 301 #define ETHER_TYPE_RARP 0x8035 /**< Reverse Arp Protocol. */
 302 #define ETHER_TYPE_VLAN 0x8100 /**< IEEE 802.1Q VLAN tagging. */
 303 #define ETHER_TYPE_QINQ 0x88A8 /**< IEEE 802.1ad QinQ tagging. */
 304 #define ETHER_TYPE_PPPOE_DISCOVERY 0x8863 /**< PPPoE Discovery Stage. */
 305 #define ETHER_TYPE_PPPOE_SESSION 0x8864 /**< PPPoE Session Stage. */
 306 #define ETHER_TYPE_ETAG 0x893F /**< IEEE 802.1BR E-Tag. */
 307 #define ETHER_TYPE_1588 0x88F7 /**< IEEE 802.1AS 1588 Precise Time Protocol. */
 308 #define ETHER_TYPE_SLOW 0x8809 /**< Slow protocols (LACP and Marker). */
 309 #define ETHER_TYPE_TEB  0x6558 /**< Transparent Ethernet Bridging. */
 310 #define ETHER_TYPE_LLDP 0x88CC /**< LLDP Protocol. */
 311 #define ETHER_TYPE_MPLS 0x8847 /**< MPLS ethertype. */
 312 #define ETHER_TYPE_MPLSM 0x8848 /**< MPLS multicast ethertype. */
 313
 314 #define ETHER_VXLAN_HLEN (sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr))
 315 /**< VXLAN tunnel header length. */
 316
 317 /**
 318  * VXLAN-GPE protocol header (draft-ietf-nvo3-vxlan-gpe-05).
 319  * Contains the 8-bit flag, 8-bit next-protocol, 24-bit VXLAN Network
 320  * Identifier and Reserved fields (16 bits and 8 bits).
 321  */
 322 struct vxlan_gpe_hdr {
 323         uint8_t vx_flags;    /**< flag (8). */
 324         uint8_t reserved[2]; /**< Reserved (16). */
 325         uint8_t proto;       /**< next-protocol (8). */
 326         uint32_t vx_vni;     /**< VNI (24) + Reserved (8). */
 327 } __attribute__((__packed__));
 328
 329 /* VXLAN-GPE next protocol types */
 330 #define VXLAN_GPE_TYPE_IPV4 1 /**< IPv4 Protocol. */
 331 #define VXLAN_GPE_TYPE_IPV6 2 /**< IPv6 Protocol. */
 332 #define VXLAN_GPE_TYPE_ETH  3 /**< Ethernet Protocol. */
 333 #define VXLAN_GPE_TYPE_NSH  4 /**< NSH Protocol. */
 334 #define VXLAN_GPE_TYPE_MPLS 5 /**< MPLS Protocol. */
 335 #define VXLAN_GPE_TYPE_GBP  6 /**< GBP Protocol. */
 336 #define VXLAN_GPE_TYPE_VBNG 7 /**< vBNG Protocol. */
 337
 338 #define ETHER_VXLAN_GPE_HLEN (sizeof(struct udp_hdr) + \
 339                               sizeof(struct vxlan_gpe_hdr))
 340 /**< VXLAN-GPE tunnel header length. */
 341
 342 /**
 343  * Extract VLAN tag information into mbuf
 344  *
 345  * Software version of VLAN stripping
 346  *
 347  * @param m
 348  *   The packet mbuf.
 349  * @return
 350  *   - 0: Success
 351  *   - 1: not a vlan packet
 352  */
 353 static inline int rte_vlan_strip(struct rte_mbuf *m)
 354 {
 355         struct ether_hdr *eh
 356                  = rte_pktmbuf_mtod(m, struct ether_hdr *);
 357         struct vlan_hdr *vh;
 358
 359         if (eh->ether_type != rte_cpu_to_be_16(ETHER_TYPE_VLAN))
 360                 return -1;
 361
 362         vh = (struct vlan_hdr *)(eh + 1);
 363         m->ol_flags |= PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED;
 364         m->vlan_tci = rte_be_to_cpu_16(vh->vlan_tci);
 365
 366         /* Copy ether header over rather than moving whole packet */
 367         memmove(rte_pktmbuf_adj(m, sizeof(struct vlan_hdr)),
 368                 eh, 2 * ETHER_ADDR_LEN);
 369
 370         return 0;
 371 }
 372
 373 /**
 374  * Insert VLAN tag into mbuf.
 375  *
 376  * Software version of VLAN unstripping
 377  *
 378  * @param m
 379  *   The packet mbuf.
 380  * @return
 381  *   - 0: On success
 382  *   -EPERM: mbuf is is shared overwriting would be unsafe
 383  *   -ENOSPC: not enough headroom in mbuf
 384  */
 385 static inline int rte_vlan_insert(struct rte_mbuf **m)
 386 {
 387         struct ether_hdr *oh, *nh;
 388         struct vlan_hdr *vh;
 389
 390         /* Can't insert header if mbuf is shared */
 391         if (rte_mbuf_refcnt_read(*m) > 1) {
 392                 struct rte_mbuf *copy;
 393
 394                 copy = rte_pktmbuf_clone(*m, (*m)->pool);
 395                 if (unlikely(copy == NULL))
 396                         return -ENOMEM;
 397                 rte_pktmbuf_free(*m);
 398                 *m = copy;
 399         }
 400
 401         oh = rte_pktmbuf_mtod(*m, struct ether_hdr *);
 402         nh = (struct ether_hdr *)
 403                 rte_pktmbuf_prepend(*m, sizeof(struct vlan_hdr));
 404         if (nh == NULL)
 405                 return -ENOSPC;
 406
 407         memmove(nh, oh, 2 * ETHER_ADDR_LEN);
 408         nh->ether_type = rte_cpu_to_be_16(ETHER_TYPE_VLAN);
 409
 410         vh = (struct vlan_hdr *) (nh + 1);
 411         vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);
 412
 413         (*m)->ol_flags &= ~(PKT_RX_VLAN_STRIPPED | PKT_TX_VLAN);
 414
 415         return 0;
 416 }
 417
 418 #ifdef __cplusplus
 419 }
 420 #endif
 421
 422 #endif /* _RTE_ETHER_H_ */