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 #define RTE_ETHER_ADDR_LEN 6 /**< Length of Ethernet address. */
27 #define RTE_ETHER_TYPE_LEN 2 /**< Length of Ethernet type field. */
28 #define RTE_ETHER_CRC_LEN 4 /**< Length of Ethernet CRC. */
29 #define RTE_ETHER_HDR_LEN \
30 (RTE_ETHER_ADDR_LEN * 2 + \
31 RTE_ETHER_TYPE_LEN) /**< Length of Ethernet header. */
32 #define RTE_ETHER_MIN_LEN 64 /**< Minimum frame len, including CRC. */
33 #define RTE_ETHER_MAX_LEN 1518 /**< Maximum frame len, including CRC. */
34 #define RTE_ETHER_MTU \
35 (RTE_ETHER_MAX_LEN - RTE_ETHER_HDR_LEN - \
36 RTE_ETHER_CRC_LEN) /**< Ethernet MTU. */
38 #define RTE_ETHER_MAX_VLAN_FRAME_LEN \
39 (RTE_ETHER_MAX_LEN + 4)
40 /**< Maximum VLAN frame length, including CRC. */
42 #define RTE_ETHER_MAX_JUMBO_FRAME_LEN \
43 0x3F00 /**< Maximum Jumbo frame length, including CRC. */
45 #define RTE_ETHER_MAX_VLAN_ID 4095 /**< Maximum VLAN ID. */
47 #define RTE_ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */
51 * A universally administered address is uniquely assigned to a device by its
52 * manufacturer. The first three octets (in transmission order) contain the
53 * Organizationally Unique Identifier (OUI). The following three (MAC-48 and
54 * EUI-48) octets are assigned by that organization with the only constraint
56 * A locally administered address is assigned to a device by a network
57 * administrator and does not contain OUIs.
58 * See http://standards.ieee.org/regauth/groupmac/tutorial.html
60 struct rte_ether_addr {
61 uint8_t addr_bytes[RTE_ETHER_ADDR_LEN]; /**< Addr bytes in tx order */
64 #define RTE_ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
65 #define RTE_ETHER_GROUP_ADDR 0x01 /**< Multicast or broadcast Eth. address. */
68 * Check if two Ethernet addresses are the same.
71 * A pointer to the first ether_addr structure containing
72 * the ethernet address.
74 * A pointer to the second ether_addr structure containing
75 * the ethernet address.
78 * True (1) if the given two ethernet address are the same;
79 * False (0) otherwise.
81 static inline int rte_is_same_ether_addr(const struct rte_ether_addr *ea1,
82 const struct rte_ether_addr *ea2)
84 const uint16_t *w1 = (const uint16_t *)ea1;
85 const uint16_t *w2 = (const uint16_t *)ea2;
87 return ((w1[0] ^ w2[0]) | (w1[1] ^ w2[1]) | (w1[2] ^ w2[2])) == 0;
91 * Check if an Ethernet address is filled with zeros.
94 * A pointer to a ether_addr structure containing the ethernet address
97 * True (1) if the given ethernet address is filled with zeros;
98 * false (0) otherwise.
100 static inline int rte_is_zero_ether_addr(const struct rte_ether_addr *ea)
102 const uint16_t *w = (const uint16_t *)ea;
104 return (w[0] | w[1] | w[2]) == 0;
108 * Check if an Ethernet address is a unicast address.
111 * A pointer to a ether_addr structure containing the ethernet address
114 * True (1) if the given ethernet address is a unicast address;
115 * false (0) otherwise.
117 static inline int rte_is_unicast_ether_addr(const struct rte_ether_addr *ea)
119 return (ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR) == 0;
123 * Check if an Ethernet address is a multicast address.
126 * A pointer to a ether_addr structure containing the ethernet address
129 * True (1) if the given ethernet address is a multicast address;
130 * false (0) otherwise.
132 static inline int rte_is_multicast_ether_addr(const struct rte_ether_addr *ea)
134 return ea->addr_bytes[0] & RTE_ETHER_GROUP_ADDR;
138 * Check if an Ethernet address is a broadcast address.
141 * A pointer to a ether_addr structure containing the ethernet address
144 * True (1) if the given ethernet address is a broadcast address;
145 * false (0) otherwise.
147 static inline int rte_is_broadcast_ether_addr(const struct rte_ether_addr *ea)
149 const uint16_t *w = (const uint16_t *)ea;
151 return (w[0] & w[1] & w[2]) == 0xFFFF;
155 * Check if an Ethernet address is a universally assigned address.
158 * A pointer to a ether_addr structure containing the ethernet address
161 * True (1) if the given ethernet address is a universally assigned address;
162 * false (0) otherwise.
164 static inline int rte_is_universal_ether_addr(const struct rte_ether_addr *ea)
166 return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) == 0;
170 * Check if an Ethernet address is a locally assigned address.
173 * A pointer to a ether_addr structure containing the ethernet address
176 * True (1) if the given ethernet address is a locally assigned address;
177 * false (0) otherwise.
179 static inline int rte_is_local_admin_ether_addr(const struct rte_ether_addr *ea)
181 return (ea->addr_bytes[0] & RTE_ETHER_LOCAL_ADMIN_ADDR) != 0;
185 * Check if an Ethernet address is a valid address. Checks that the address is a
186 * unicast address and is not filled with zeros.
189 * A pointer to a ether_addr structure containing the ethernet address
192 * True (1) if the given ethernet address is valid;
193 * false (0) otherwise.
195 static inline int rte_is_valid_assigned_ether_addr(const struct rte_ether_addr *ea)
197 return rte_is_unicast_ether_addr(ea) && (!rte_is_zero_ether_addr(ea));
201 * Generate a random Ethernet address that is locally administered
204 * A pointer to Ethernet address.
207 rte_eth_random_addr(uint8_t *addr);
210 * Copy an Ethernet address.
213 * A pointer to a ether_addr structure holding the Ethernet address to copy.
215 * A pointer to a ether_addr structure where to copy the Ethernet address.
218 rte_ether_addr_copy(const struct rte_ether_addr *__restrict ea_from,
219 struct rte_ether_addr *__restrict ea_to)
224 #define RTE_ETHER_ADDR_FMT_SIZE 18
226 * Format 48bits Ethernet address in pattern xx:xx:xx:xx:xx:xx.
229 * A pointer to buffer contains the formatted MAC address.
231 * The format buffer size.
233 * A pointer to a ether_addr structure.
236 rte_ether_format_addr(char *buf, uint16_t size,
237 const struct rte_ether_addr *eth_addr);
239 * Convert string with Ethernet address to an ether_addr.
242 * A pointer to buffer contains the formatted MAC address.
243 * The supported formats are:
244 * XX:XX:XX:XX:XX:XX or XXXX:XXXX:XXXX
245 * where XX is a hex digit: 0-9, a-f, or A-F.
247 * A pointer to a ether_addr structure.
250 * -1 and sets rte_errno if invalid string
254 rte_ether_unformat_addr(const char *str, struct rte_ether_addr *eth_addr);
256 /* Windows Sockets headers contain `#define s_addr S_un.S_addr`.
257 * Temporarily disable this macro to avoid conflict at definition.
258 * Place source MAC address in both `s_addr` and `S_un.S_addr` fields,
259 * so that access works either directly or through the macro.
261 #pragma push_macro("s_addr")
267 * Ethernet header: Contains the destination address, source address
270 struct rte_ether_hdr {
271 struct rte_ether_addr d_addr; /**< Destination address. */
274 struct rte_ether_addr s_addr; /**< Source address. */
276 struct rte_ether_addr S_addr;
277 } S_un; /**< Do not use directly; use s_addr instead.*/
279 rte_be16_t ether_type; /**< Frame type. */
282 #pragma pop_macro("s_addr")
285 * Ethernet VLAN Header.
286 * Contains the 16-bit VLAN Tag Control Identifier and the Ethernet type
287 * of the encapsulated frame.
289 struct rte_vlan_hdr {
290 rte_be16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
291 rte_be16_t eth_proto; /**< Ethernet type of encapsulated frame. */
296 /* Ethernet frame types */
297 #define RTE_ETHER_TYPE_IPV4 0x0800 /**< IPv4 Protocol. */
298 #define RTE_ETHER_TYPE_IPV6 0x86DD /**< IPv6 Protocol. */
299 #define RTE_ETHER_TYPE_ARP 0x0806 /**< Arp Protocol. */
300 #define RTE_ETHER_TYPE_RARP 0x8035 /**< Reverse Arp Protocol. */
301 #define RTE_ETHER_TYPE_VLAN 0x8100 /**< IEEE 802.1Q VLAN tagging. */
302 #define RTE_ETHER_TYPE_QINQ 0x88A8 /**< IEEE 802.1ad QinQ tagging. */
303 #define RTE_ETHER_TYPE_QINQ1 0x9100 /**< Deprecated QinQ VLAN. */
304 #define RTE_ETHER_TYPE_QINQ2 0x9200 /**< Deprecated QinQ VLAN. */
305 #define RTE_ETHER_TYPE_QINQ3 0x9300 /**< Deprecated QinQ VLAN. */
306 #define RTE_ETHER_TYPE_PPPOE_DISCOVERY 0x8863 /**< PPPoE Discovery Stage. */
307 #define RTE_ETHER_TYPE_PPPOE_SESSION 0x8864 /**< PPPoE Session Stage. */
308 #define RTE_ETHER_TYPE_ETAG 0x893F /**< IEEE 802.1BR E-Tag. */
309 #define RTE_ETHER_TYPE_1588 0x88F7
310 /**< IEEE 802.1AS 1588 Precise Time Protocol. */
311 #define RTE_ETHER_TYPE_SLOW 0x8809 /**< Slow protocols (LACP and Marker). */
312 #define RTE_ETHER_TYPE_TEB 0x6558 /**< Transparent Ethernet Bridging. */
313 #define RTE_ETHER_TYPE_LLDP 0x88CC /**< LLDP Protocol. */
314 #define RTE_ETHER_TYPE_MPLS 0x8847 /**< MPLS ethertype. */
315 #define RTE_ETHER_TYPE_MPLSM 0x8848 /**< MPLS multicast ethertype. */
316 #define RTE_ETHER_TYPE_ECPRI 0xAEFE /**< eCPRI ethertype (.1Q supported). */
319 * Extract VLAN tag information into mbuf
321 * Software version of VLAN stripping
327 * - 1: not a vlan packet
329 static inline int rte_vlan_strip(struct rte_mbuf *m)
331 struct rte_ether_hdr *eh
332 = rte_pktmbuf_mtod(m, struct rte_ether_hdr *);
333 struct rte_vlan_hdr *vh;
335 if (eh->ether_type != rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN))
338 vh = (struct rte_vlan_hdr *)(eh + 1);
339 m->ol_flags |= PKT_RX_VLAN | PKT_RX_VLAN_STRIPPED;
340 m->vlan_tci = rte_be_to_cpu_16(vh->vlan_tci);
342 /* Copy ether header over rather than moving whole packet */
343 memmove(rte_pktmbuf_adj(m, sizeof(struct rte_vlan_hdr)),
344 eh, 2 * RTE_ETHER_ADDR_LEN);
350 * Insert VLAN tag into mbuf.
352 * Software version of VLAN unstripping
358 * -EPERM: mbuf is is shared overwriting would be unsafe
359 * -ENOSPC: not enough headroom in mbuf
361 static inline int rte_vlan_insert(struct rte_mbuf **m)
363 struct rte_ether_hdr *oh, *nh;
364 struct rte_vlan_hdr *vh;
366 /* Can't insert header if mbuf is shared */
367 if (!RTE_MBUF_DIRECT(*m) || rte_mbuf_refcnt_read(*m) > 1)
370 /* Can't insert header if the first segment is too short */
371 if (rte_pktmbuf_data_len(*m) < 2 * RTE_ETHER_ADDR_LEN)
374 oh = rte_pktmbuf_mtod(*m, struct rte_ether_hdr *);
375 nh = (struct rte_ether_hdr *)
376 rte_pktmbuf_prepend(*m, sizeof(struct rte_vlan_hdr));
380 memmove(nh, oh, 2 * RTE_ETHER_ADDR_LEN);
381 nh->ether_type = rte_cpu_to_be_16(RTE_ETHER_TYPE_VLAN);
383 vh = (struct rte_vlan_hdr *) (nh + 1);
384 vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci);
386 (*m)->ol_flags &= ~(PKT_RX_VLAN_STRIPPED | PKT_TX_VLAN);
388 if ((*m)->ol_flags & PKT_TX_TUNNEL_MASK)
389 (*m)->outer_l2_len += sizeof(struct rte_vlan_hdr);
391 (*m)->l2_len += sizeof(struct rte_vlan_hdr);
400 #endif /* _RTE_ETHER_H_ */