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40 * Ethernet Helpers in RTE
50 #include <rte_memcpy.h>
51 #include <rte_random.h>
53 #define ETHER_ADDR_LEN 6 /**< Length of Ethernet address. */
54 #define ETHER_TYPE_LEN 2 /**< Length of Ethernet type field. */
55 #define ETHER_CRC_LEN 4 /**< Length of Ethernet CRC. */
56 #define ETHER_HDR_LEN \
57 (ETHER_ADDR_LEN * 2 + ETHER_TYPE_LEN) /**< Length of Ethernet header. */
58 #define ETHER_MIN_LEN 64 /**< Minimum frame len, including CRC. */
59 #define ETHER_MAX_LEN 1518 /**< Maximum frame len, including CRC. */
61 (ETHER_MAX_LEN - ETHER_HDR_LEN - ETHER_CRC_LEN) /**< Ethernet MTU. */
63 #define ETHER_MAX_VLAN_FRAME_LEN \
64 (ETHER_MAX_LEN + 4) /**< Maximum VLAN frame length, including CRC. */
66 #define ETHER_MAX_JUMBO_FRAME_LEN \
67 0x3F00 /**< Maximum Jumbo frame length, including CRC. */
69 #define ETHER_MAX_VLAN_ID 4095 /**< Maximum VLAN ID. */
71 #define ETHER_MIN_MTU 68 /**< Minimum MTU for IPv4 packets, see RFC 791. */
75 * A universally administered address is uniquely assigned to a device by its
76 * manufacturer. The first three octets (in transmission order) contain the
77 * Organizationally Unique Identifier (OUI). The following three (MAC-48 and
78 * EUI-48) octets are assigned by that organization with the only constraint
80 * A locally administered address is assigned to a device by a network
81 * administrator and does not contain OUIs.
82 * See http://standards.ieee.org/regauth/groupmac/tutorial.html
85 uint8_t addr_bytes[ETHER_ADDR_LEN]; /**< Address bytes in transmission order */
86 } __attribute__((__packed__));
88 #define ETHER_LOCAL_ADMIN_ADDR 0x02 /**< Locally assigned Eth. address. */
89 #define ETHER_GROUP_ADDR 0x01 /**< Multicast or broadcast Eth. address. */
92 * Check if two Ethernet addresses are the same.
95 * A pointer to the first ether_addr structure containing
96 * the ethernet address.
98 * A pointer to the second ether_addr structure containing
99 * the ethernet address.
102 * True (1) if the given two ethernet address are the same;
103 * False (0) otherwise.
105 static inline int is_same_ether_addr(const struct ether_addr *ea1,
106 const struct ether_addr *ea2)
109 for (i = 0; i < ETHER_ADDR_LEN; i++)
110 if (ea1->addr_bytes[i] != ea2->addr_bytes[i])
116 * Check if an Ethernet address is filled with zeros.
119 * A pointer to a ether_addr structure containing the ethernet address
122 * True (1) if the given ethernet address is filled with zeros;
123 * false (0) otherwise.
125 static inline int is_zero_ether_addr(const struct ether_addr *ea)
128 for (i = 0; i < ETHER_ADDR_LEN; i++)
129 if (ea->addr_bytes[i] != 0x00)
135 * Check if an Ethernet address is a unicast address.
138 * A pointer to a ether_addr structure containing the ethernet address
141 * True (1) if the given ethernet address is a unicast address;
142 * false (0) otherwise.
144 static inline int is_unicast_ether_addr(const struct ether_addr *ea)
146 return ((ea->addr_bytes[0] & ETHER_GROUP_ADDR) == 0);
150 * Check if an Ethernet address is a multicast address.
153 * A pointer to a ether_addr structure containing the ethernet address
156 * True (1) if the given ethernet address is a multicast address;
157 * false (0) otherwise.
159 static inline int is_multicast_ether_addr(const struct ether_addr *ea)
161 return (ea->addr_bytes[0] & ETHER_GROUP_ADDR);
165 * Check if an Ethernet address is a broadcast address.
168 * A pointer to a ether_addr structure containing the ethernet address
171 * True (1) if the given ethernet address is a broadcast address;
172 * false (0) otherwise.
174 static inline int is_broadcast_ether_addr(const struct ether_addr *ea)
176 const uint16_t *ea_words = (const uint16_t *)ea;
178 return (ea_words[0] == 0xFFFF && ea_words[1] == 0xFFFF &&
179 ea_words[2] == 0xFFFF);
183 * Check if an Ethernet address is a universally assigned address.
186 * A pointer to a ether_addr structure containing the ethernet address
189 * True (1) if the given ethernet address is a universally assigned address;
190 * false (0) otherwise.
192 static inline int is_universal_ether_addr(const struct ether_addr *ea)
194 return ((ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) == 0);
198 * Check if an Ethernet address is a locally assigned address.
201 * A pointer to a ether_addr structure containing the ethernet address
204 * True (1) if the given ethernet address is a locally assigned address;
205 * false (0) otherwise.
207 static inline int is_local_admin_ether_addr(const struct ether_addr *ea)
209 return ((ea->addr_bytes[0] & ETHER_LOCAL_ADMIN_ADDR) != 0);
213 * Check if an Ethernet address is a valid address. Checks that the address is a
214 * unicast address and is not filled with zeros.
217 * A pointer to a ether_addr structure containing the ethernet address
220 * True (1) if the given ethernet address is valid;
221 * false (0) otherwise.
223 static inline int is_valid_assigned_ether_addr(const struct ether_addr *ea)
225 return (is_unicast_ether_addr(ea) && (! is_zero_ether_addr(ea)));
229 * Generate a random Ethernet address that is locally administered
232 * A pointer to Ethernet address.
234 static inline void eth_random_addr(uint8_t *addr)
236 uint64_t rand = rte_rand();
237 uint8_t *p = (uint8_t*)&rand;
239 rte_memcpy(addr, p, ETHER_ADDR_LEN);
240 addr[0] &= ~ETHER_GROUP_ADDR; /* clear multicast bit */
241 addr[0] |= ETHER_LOCAL_ADMIN_ADDR; /* set local assignment bit */
245 * Fast copy an Ethernet address.
248 * A pointer to a ether_addr structure holding the Ethernet address to copy.
250 * A pointer to a ether_addr structure where to copy the Ethernet address.
252 static inline void ether_addr_copy(const struct ether_addr *ea_from,
253 struct ether_addr *ea_to)
255 #ifdef __INTEL_COMPILER
256 uint16_t *from_words = (uint16_t *)(ea_from->addr_bytes);
257 uint16_t *to_words = (uint16_t *)(ea_to->addr_bytes);
259 to_words[0] = from_words[0];
260 to_words[1] = from_words[1];
261 to_words[2] = from_words[2];
264 * Use the common way, because of a strange gcc warning.
270 #define ETHER_ADDR_FMT_SIZE 18
272 * Format 48bits Ethernet address in pattern xx:xx:xx:xx:xx:xx.
275 * A pointer to buffer contains the formatted MAC address.
277 * The format buffer size.
279 * A pointer to a ether_addr structure.
282 ether_format_addr(char *buf, uint16_t size,
283 const struct ether_addr *eth_addr)
285 snprintf(buf, size, "%02X:%02X:%02X:%02X:%02X:%02X",
286 eth_addr->addr_bytes[0],
287 eth_addr->addr_bytes[1],
288 eth_addr->addr_bytes[2],
289 eth_addr->addr_bytes[3],
290 eth_addr->addr_bytes[4],
291 eth_addr->addr_bytes[5]);
295 * Ethernet header: Contains the destination address, source address
299 struct ether_addr d_addr; /**< Destination address. */
300 struct ether_addr s_addr; /**< Source address. */
301 uint16_t ether_type; /**< Frame type. */
302 } __attribute__((__packed__));
305 * Ethernet VLAN Header.
306 * Contains the 16-bit VLAN Tag Control Identifier and the Ethernet type
307 * of the encapsulated frame.
310 uint16_t vlan_tci; /**< Priority (3) + CFI (1) + Identifier Code (12) */
311 uint16_t eth_proto;/**< Ethernet type of encapsulated frame. */
312 } __attribute__((__packed__));
315 * VXLAN protocol header.
316 * Contains the 8-bit flag, 24-bit VXLAN Network Identifier and
317 * Reserved fields (24 bits and 8 bits)
320 uint32_t vx_flags; /**< flag (8) + Reserved (24). */
321 uint32_t vx_vni; /**< VNI (24) + Reserved (8). */
322 } __attribute__((__packed__));
324 /* Ethernet frame types */
325 #define ETHER_TYPE_IPv4 0x0800 /**< IPv4 Protocol. */
326 #define ETHER_TYPE_IPv6 0x86DD /**< IPv6 Protocol. */
327 #define ETHER_TYPE_ARP 0x0806 /**< Arp Protocol. */
328 #define ETHER_TYPE_RARP 0x8035 /**< Reverse Arp Protocol. */
329 #define ETHER_TYPE_VLAN 0x8100 /**< IEEE 802.1Q VLAN tagging. */
330 #define ETHER_TYPE_1588 0x88F7 /**< IEEE 802.1AS 1588 Precise Time Protocol. */
332 #define ETHER_VXLAN_HLEN (sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr))
333 /**< VXLAN tunnel header length. */
339 #endif /* _RTE_ETHER_H_ */