1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2010-2014 Intel Corporation
11 * Ethernet Helpers in RTE
21 #include <rte_memcpy.h>
22 #include <rte_random.h>
24 #include <rte_byteorder.h>
26 #ifndef RTE_NET_NO_COMPAT
27 #include <rte_ether_compat.h>
30 #define RTE_ETHER_ADDR_LEN 6 /**< Length of Ethernet address. */
31 #define RTE_ETHER_TYPE_LEN 2 /**< Length of Ethernet type field. */
32 #define RTE_ETHER_CRC_LEN 4 /**< Length of Ethernet CRC. */
33 #define RTE_ETHER_HDR_LEN \
34 (RTE_ETHER_ADDR_LEN * 2 + RTE_ETHER_TYPE_LEN) /**< Length of Ethernet header. */
35 #define RTE_ETHER_MIN_LEN 64 /**< Minimum frame len, including CRC. */
36 #define RTE_ETHER_MAX_LEN 1518 /**< Maximum frame len, including CRC. */
37 #define RTE_ETHER_MTU \
38 (RTE_ETHER_MAX_LEN - RTE_ETHER_HDR_LEN - RTE_ETHER_CRC_LEN) /**< Ethernet MTU. */
40 #define RTE_ETHER_MAX_VLAN_FRAME_LEN \
41 (RTE_ETHER_MAX_LEN + 4) /**< Maximum VLAN frame length, including CRC. */
43 #define RTE_ETHER_MAX_JUMBO_FRAME_LEN \
44 0x3F00 /**< Maximum Jumbo frame length, including CRC. */
46 #define RTE_ETHER_MAX_VLAN_ID 4095 /**< Maximum VLAN ID. */
48 #define RTE_ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */
52 * A universally administered address is uniquely assigned to a device by its
53 * manufacturer. The first three octets (in transmission order) contain the
54 * Organizationally Unique Identifier (OUI). The following three (MAC-48 and
55 * EUI-48) octets are assigned by that organization with the only constraint
57 * A locally administered address is assigned to a device by a network
58 * administrator and does not contain OUIs.
59 * See http://standards.ieee.org/regauth/groupmac/tutorial.html
61 struct rte_ether_addr {
62 uint8_t addr_bytes[RTE_ETHER_ADDR_LEN]; /**< Addr bytes in tx order */
63 } __attribute__((__packed__));
65 #define RTE_ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
66 #define RTE_ETHER_GROUP_ADDR 0x01 /**< Multicast or broadcast Eth. address. */
69 * Check if two Ethernet addresses are the same.
72 * A pointer to the first ether_addr structure containing
73 * the ethernet address.
75 * A pointer to the second ether_addr structure containing
76 * the ethernet address.
79 * True (1) if the given two ethernet address are the same;
80 * False (0) otherwise.
82 static inline int rte_is_same_ether_addr(const struct rte_ether_addr *ea1,
83 const struct rte_ether_addr *ea2)
86 for (i = 0; i < RTE_ETHER_ADDR_LEN; i++)
87 if (ea1->addr_bytes[i] != ea2->addr_bytes[i])
93 * Check if an Ethernet address is filled with zeros.
96 * A pointer to a ether_addr structure containing the ethernet address
99 * True (1) if the given ethernet address is filled with zeros;
100 * false (0) otherwise.
102 static inline int rte_is_zero_ether_addr(const struct rte_ether_addr *ea)
105 for (i = 0; i < RTE_ETHER_ADDR_LEN; i++)
106 if (ea->addr_bytes[i] != 0x00)
112 * Check if an Ethernet address is a unicast address.
115 * A pointer to a ether_addr structure containing the ethernet address
118 * True (1) if the given ethernet address is a unicast address;
119 * false (0) otherwise.
121 static inline int rte_is_unicast_ether_addr(const struct rte_ether_addr *ea)
123 return (ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR) == 0;
127 * Check if an Ethernet address is a multicast address.
130 * A pointer to a ether_addr structure containing the ethernet address
133 * True (1) if the given ethernet address is a multicast address;
134 * false (0) otherwise.
136 static inline int rte_is_multicast_ether_addr(const struct rte_ether_addr *ea)
138 return ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR;
142 * Check if an Ethernet address is a broadcast address.
145 * A pointer to a ether_addr structure containing the ethernet address
148 * True (1) if the given ethernet address is a broadcast address;
149 * false (0) otherwise.
151 static inline int rte_is_broadcast_ether_addr(const struct rte_ether_addr *ea)
153 const unaligned_uint16_t *ea_words = (const unaligned_uint16_t *)ea;
155 return (ea_words[0] == 0xFFFF && ea_words[1] == 0xFFFF &&
156 ea_words[2] == 0xFFFF);
160 * Check if an Ethernet address is a universally assigned address.
163 * A pointer to a ether_addr structure containing the ethernet address
166 * True (1) if the given ethernet address is a universally assigned address;
167 * false (0) otherwise.
169 static inline int rte_is_universal_ether_addr(const struct rte_ether_addr *ea)
171 return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) == 0;
175 * Check if an Ethernet address is a locally assigned address.
178 * A pointer to a ether_addr structure containing the ethernet address
181 * True (1) if the given ethernet address is a locally assigned address;
182 * false (0) otherwise.
184 static inline int rte_is_local_admin_ether_addr(const struct rte_ether_addr *ea)
186 return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) != 0;
190 * Check if an Ethernet address is a valid address. Checks that the address is a
191 * unicast address and is not filled with zeros.
194 * A pointer to a ether_addr structure containing the ethernet address
197 * True (1) if the given ethernet address is valid;
198 * false (0) otherwise.
200 static inline int rte_is_valid_assigned_ether_addr(const struct rte_ether_addr *ea)
202 return rte_is_unicast_ether_addr(ea) && (!rte_is_zero_ether_addr(ea));
206 * Generate a random Ethernet address that is locally administered
209 * A pointer to Ethernet address.
211 static inline void rte_eth_random_addr(uint8_t *addr)
213 uint64_t rand = rte_rand();
214 uint8_t *p = (uint8_t *)&rand;
216 rte_memcpy(addr, p, RTE_ETHER_ADDR_LEN);
217 addr[0] &= (uint8_t)~RTE_ETHER_GROUP_ADDR; /* clear multicast bit */
218 addr[0] |= RTE_ETHER_LOCAL_ADMIN_ADDR; /* set local assignment bit */
222 * Fast copy an Ethernet address.
225 * A pointer to a ether_addr structure holding the Ethernet address to copy.
227 * A pointer to a ether_addr structure where to copy the Ethernet address.
229 static inline void rte_ether_addr_copy(const struct rte_ether_addr *ea_from,
230 struct rte_ether_addr *ea_to)
232 #ifdef __INTEL_COMPILER
233 uint16_t *from_words = (uint16_t *)(ea_from->addr_bytes);
234 uint16_t *to_words = (uint16_t *)(ea_to->addr_bytes);
236 to_words[0] = from_words[0];
237 to_words[1] = from_words[1];
238 to_words[2] = from_words[2];
241 * Use the common way, because of a strange gcc warning.
247 #define RTE_ETHER_ADDR_FMT_SIZE 18
249 * Format 48bits Ethernet address in pattern xx:xx:xx:xx:xx:xx.
252 * A pointer to buffer contains the formatted MAC address.
254 * The format buffer size.
256 * A pointer to a ether_addr structure.
259 rte_ether_format_addr(char *buf, uint16_t size,
260 const struct rte_ether_addr *eth_addr)
262 snprintf(buf, size, "%02X:%02X:%02X:%02X:%02X:%02X",
263 eth_addr->addr_bytes[0],
264 eth_addr->addr_bytes[1],
265 eth_addr->addr_bytes[2],
266 eth_addr->addr_bytes[3],
267 eth_addr->addr_bytes[4],
268 eth_addr->addr_bytes[5]);
272 * Ethernet header: Contains the destination address, source address
275 struct rte_ether_hdr {
276 struct rte_ether_addr d_addr; /**< Destination address. */
277 struct rte_ether_addr s_addr; /**< Source address. */
278 uint16_t ether_type; /**< Frame type. */
279 } __attribute__((__packed__));
282 * Ethernet VLAN Header.
283 * Contains the 16-bit VLAN Tag Control Identifier and the Ethernet type
284 * of the encapsulated frame.
286 struct rte_vlan_hdr {
287 uint16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
288 uint16_t eth_proto;/**< Ethernet type of encapsulated frame. */
289 } __attribute__((__packed__));
292 * VXLAN protocol header.
293 * Contains the 8-bit flag, 24-bit VXLAN Network Identifier and
294 * Reserved fields (24 bits and 8 bits)
296 struct rte_vxlan_hdr {
297 uint32_t vx_flags; /**< flag (8) + Reserved (24). */
298 uint32_t vx_vni; /**< VNI (24) + Reserved (8). */
299 } __attribute__((__packed__));
301 /* Ethernet frame types */
302 #define RTE_ETHER_TYPE_IPv4 0x0800 /**< IPv4 Protocol. */
303 #define RTE_ETHER_TYPE_IPv6 0x86DD /**< IPv6 Protocol. */
304 #define RTE_ETHER_TYPE_ARP 0x0806 /**< Arp Protocol. */
305 #define RTE_ETHER_TYPE_RARP 0x8035 /**< Reverse Arp Protocol. */
306 #define RTE_ETHER_TYPE_VLAN 0x8100 /**< IEEE 802.1Q VLAN tagging. */
307 #define RTE_ETHER_TYPE_QINQ 0x88A8 /**< IEEE 802.1ad QinQ tagging. */
308 #define RTE_ETHER_TYPE_ETAG 0x893F /**< IEEE 802.1BR E-Tag. */
309 #define RTE_ETHER_TYPE_1588 0x88F7 /**< IEEE 802.1AS 1588 Precise Time Protocol. */
310 #define RTE_ETHER_TYPE_SLOW 0x8809 /**< Slow protocols (LACP and Marker). */
311 #define RTE_ETHER_TYPE_TEB 0x6558 /**< Transparent Ethernet Bridging. */
312 #define RTE_ETHER_TYPE_LLDP 0x88CC /**< LLDP Protocol. */
314 #define RTE_ETHER_VXLAN_HLEN (sizeof(struct rte_udp_hdr) + sizeof(struct rte_vxlan_hdr))
315 /**< VXLAN tunnel header length. */
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).
322 struct rte_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__));
329 /* VXLAN-GPE next protocol types */
330 #define RTE_VXLAN_GPE_TYPE_IPV4 1 /**< IPv4 Protocol. */
331 #define RTE_VXLAN_GPE_TYPE_IPV6 2 /**< IPv6 Protocol. */
332 #define RTE_VXLAN_GPE_TYPE_ETH 3 /**< Ethernet Protocol. */
333 #define RTE_VXLAN_GPE_TYPE_NSH 4 /**< NSH Protocol. */
334 #define RTE_VXLAN_GPE_TYPE_MPLS 5 /**< MPLS Protocol. */
335 #define RTE_VXLAN_GPE_TYPE_GBP 6 /**< GBP Protocol. */
336 #define RTE_VXLAN_GPE_TYPE_VBNG 7 /**< vBNG Protocol. */
338 #define RTE_ETHER_VXLAN_GPE_HLEN (sizeof(struct rte_udp_hdr) + \
339 sizeof(struct rte_vxlan_gpe_hdr))
340 /**< VXLAN-GPE tunnel header length. */
343 * Extract VLAN tag information into mbuf
345 * Software version of VLAN stripping
351 * - 1: not a vlan packet
353 static inline int rte_vlan_strip(struct rte_mbuf *m)
355 struct rte_ether_hdr *eh
356 = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
357 struct rte_vlan_hdr *vh;
359 if (eh->ether_type != rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN))
362 vh = (struct rte_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);
366 /* Copy ether header over rather than moving whole packet */
367 memmove(rte_pktmbuf_adj(m, sizeof(struct rte_vlan_hdr)),
368 eh, 2 * RTE_ETHER_ADDR_LEN);
374 * Insert VLAN tag into mbuf.
376 * Software version of VLAN unstripping
382 * -EPERM: mbuf is is shared overwriting would be unsafe
383 * -ENOSPC: not enough headroom in mbuf
385 static inline int rte_vlan_insert(struct rte_mbuf **m)
387 struct rte_ether_hdr *oh, *nh;
388 struct rte_vlan_hdr *vh;
390 /* Can't insert header if mbuf is shared */
391 if (rte_mbuf_refcnt_read(*m) > 1) {
392 struct rte_mbuf *copy;
394 copy = rte_pktmbuf_clone(*m, (*m)->pool);
395 if (unlikely(copy == NULL))
397 rte_pktmbuf_free(*m);
401 oh = rte_pktmbuf_mtod(*m, struct rte_ether_hdr *);
402 nh = (struct rte_ether_hdr *)
403 rte_pktmbuf_prepend(*m, sizeof(struct rte_vlan_hdr));
407 memmove(nh, oh, 2 * RTE_ETHER_ADDR_LEN);
408 nh->ether_type = rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN);
410 vh = (struct rte_vlan_hdr *) (nh + 1);
411 vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);
413 (*m)->ol_flags &= ~PKT_RX_VLAN_STRIPPED;
422 #endif /* _RTE_ETHER_H_ */