2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
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10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * ethernet.h: types/functions for ethernet.
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #ifndef included_ethernet_h
41 #define included_ethernet_h
43 #include <vnet/vnet.h>
44 #include <vnet/ethernet/packet.h>
45 #include <vnet/pg/pg.h>
46 #include <vnet/feature/feature.h>
49 ethernet_mac_address_u64 (u8 * a)
51 return (((u64) a[0] << (u64) (5 * 8))
52 | ((u64) a[1] << (u64) (4 * 8))
53 | ((u64) a[2] << (u64) (3 * 8))
54 | ((u64) a[3] << (u64) (2 * 8))
55 | ((u64) a[4] << (u64) (1 * 8)) | ((u64) a[5] << (u64) (0 * 8)));
59 ethernet_mac_address_is_multicast_u64 (u64 a)
61 return (a & (1ULL << (5 * 8))) != 0;
64 static_always_inline int
65 ethernet_frame_is_tagged (u16 type)
68 const __m128i ethertype_mask = _mm_set_epi16 (ETHERNET_TYPE_VLAN,
70 ETHERNET_TYPE_VLAN_9100,
71 ETHERNET_TYPE_VLAN_9200,
72 /* duplicate last one to
74 ETHERNET_TYPE_VLAN_9200,
75 ETHERNET_TYPE_VLAN_9200,
76 ETHERNET_TYPE_VLAN_9200,
77 ETHERNET_TYPE_VLAN_9200);
79 __m128i r = _mm_set1_epi16 (type);
80 r = _mm_cmpeq_epi16 (ethertype_mask, r);
81 return !_mm_test_all_zeros (r, r);
83 if ((type == ETHERNET_TYPE_VLAN) ||
84 (type == ETHERNET_TYPE_DOT1AD) ||
85 (type == ETHERNET_TYPE_VLAN_9100) || (type == ETHERNET_TYPE_VLAN_9200))
91 /* Max. sized ethernet/vlan header for parsing. */
94 ethernet_header_t ethernet;
96 /* Allow up to 2 stacked vlan headers. */
97 ethernet_vlan_header_t vlan[2];
98 } ethernet_max_header_t;
100 struct vnet_hw_interface_t;
101 /* Ethernet flag change callback. */
102 typedef u32 (ethernet_flag_change_function_t)
103 (vnet_main_t * vnm, struct vnet_hw_interface_t * hi, u32 flags);
105 #define ETHERNET_MIN_PACKET_BYTES 64
106 #define ETHERNET_MAX_PACKET_BYTES 9216
108 /* Ethernet interface instance. */
109 typedef struct ethernet_interface
112 /* Accept all packets (promiscuous mode). */
113 #define ETHERNET_INTERFACE_FLAG_ACCEPT_ALL (1 << 0)
114 #define ETHERNET_INTERFACE_FLAG_CONFIG_PROMISC(flags) \
115 (((flags) & ~ETHERNET_INTERFACE_FLAG_ACCEPT_ALL) == 0)
117 /* Change MTU on interface from hw interface structure */
118 #define ETHERNET_INTERFACE_FLAG_MTU (1 << 1)
119 #define ETHERNET_INTERFACE_FLAG_CONFIG_MTU(flags) \
120 ((flags) & ETHERNET_INTERFACE_FLAG_MTU)
122 /* Callback, e.g. to turn on/off promiscuous mode */
123 ethernet_flag_change_function_t *flag_change;
127 /* Ethernet (MAC) address for this interface. */
129 } ethernet_interface_t;
131 extern vnet_hw_interface_class_t ethernet_hw_interface_class;
135 /* Name (a c string). */
138 /* Ethernet type in host byte order. */
139 ethernet_type_t type;
141 /* Node which handles this type. */
144 /* Next index for this type. */
146 } ethernet_type_info_t;
150 #define ethernet_error(n,c,s) ETHERNET_ERROR_##n,
151 #include <vnet/ethernet/error.def>
152 #undef ethernet_error
157 // Structs used when parsing packet to find sw_if_index
163 // config entry is-valid flag
164 // exact match flags (valid if packet has 0/1/2/3 tags)
165 // L2 vs L3 forwarding mode
166 #define SUBINT_CONFIG_MATCH_0_TAG (1<<0)
167 #define SUBINT_CONFIG_MATCH_1_TAG (1<<1)
168 #define SUBINT_CONFIG_MATCH_2_TAG (1<<2)
169 #define SUBINT_CONFIG_MATCH_3_TAG (1<<3)
170 #define SUBINT_CONFIG_VALID (1<<4)
171 #define SUBINT_CONFIG_L2 (1<<5)
176 eth_create_valid_subint_match_flags (u32 num_tags)
178 return SUBINT_CONFIG_VALID | (1 << num_tags);
184 subint_config_t untagged_subint;
185 subint_config_t default_subint;
186 u16 dot1q_vlans; // pool id for vlan table
187 u16 dot1ad_vlans; // pool id for vlan table
192 subint_config_t single_tag_subint;
193 subint_config_t inner_any_subint;
194 u32 qinqs; // pool id for qinq table
199 vlan_intf_t vlans[ETHERNET_N_VLAN];
204 subint_config_t subint;
209 qinq_intf_t vlans[ETHERNET_N_VLAN];
212 // Structure mapping to a next index based on ethertype.
213 // Common ethertypes are stored explicitly, others are
214 // stored in a sparse table.
217 /* Sparse vector mapping ethernet type in network byte order
219 u16 *input_next_by_type;
220 u32 *sparse_index_by_input_next_index;
222 /* cached next indexes for common ethertypes */
226 } next_by_ethertype_t;
230 vlib_main_t *vlib_main;
232 /* next node index for the L3 input node of each ethertype */
233 next_by_ethertype_t l3_next;
235 /* next node index for L2 interfaces */
238 /* flag and next node index for L3 redirect */
240 u32 redirect_l3_next;
242 /* Pool of ethernet interface instances. */
243 ethernet_interface_t *interfaces;
245 ethernet_type_info_t *type_infos;
247 /* Hash tables mapping name/type to type info index. */
248 uword *type_info_by_name, *type_info_by_type;
250 // The root of the vlan parsing tables. A vector with one element
251 // for each main interface, indexed by hw_if_index.
252 main_intf_t *main_intfs;
254 // Pool of vlan tables
255 vlan_table_t *vlan_pool;
257 // Pool of qinq tables;
258 qinq_table_t *qinq_pool;
260 /* Set to one to use AB.CD.EF instead of A:B:C:D:E:F as ethernet format. */
261 int format_ethernet_address_16bit;
263 /* debug: make sure we don't wipe out an ethernet registration by mistake */
264 u8 next_by_ethertype_register_called;
266 /* Feature arc index */
267 u8 output_feature_arc_index;
270 ethernet_main_t ethernet_main;
272 always_inline ethernet_type_info_t *
273 ethernet_get_type_info (ethernet_main_t * em, ethernet_type_t type)
275 uword *p = hash_get (em->type_info_by_type, type);
276 return p ? vec_elt_at_index (em->type_infos, p[0]) : 0;
279 ethernet_interface_t *ethernet_get_interface (ethernet_main_t * em,
282 clib_error_t *ethernet_register_interface (vnet_main_t * vnm,
286 u32 * hw_if_index_return,
287 ethernet_flag_change_function_t
290 void ethernet_delete_interface (vnet_main_t * vnm, u32 hw_if_index);
292 /* Register given node index to take input for given ethernet type. */
294 ethernet_register_input_type (vlib_main_t * vm,
295 ethernet_type_t type, u32 node_index);
297 /* Register given node index to take input for packet from L2 interfaces. */
298 void ethernet_register_l2_input (vlib_main_t * vm, u32 node_index);
300 /* Register given node index to take redirected L3 traffic, and enable L3 redirect */
301 void ethernet_register_l3_redirect (vlib_main_t * vm, u32 node_index);
303 /* Formats ethernet address X:X:X:X:X:X */
304 u8 *format_ethernet_address (u8 * s, va_list * args);
305 u8 *format_ethernet_type (u8 * s, va_list * args);
306 u8 *format_ethernet_vlan_tci (u8 * s, va_list * va);
307 u8 *format_ethernet_header (u8 * s, va_list * args);
308 u8 *format_ethernet_header_with_length (u8 * s, va_list * args);
310 /* Parse ethernet address in either X:X:X:X:X:X unix or X.X.X cisco format. */
311 uword unformat_ethernet_address (unformat_input_t * input, va_list * args);
313 /* Parse ethernet type as 0xXXXX or type name from ethernet/types.def.
314 In either host or network byte order. */
316 unformat_ethernet_type_host_byte_order (unformat_input_t * input,
319 unformat_ethernet_type_net_byte_order (unformat_input_t * input,
322 /* Parse ethernet header. */
323 uword unformat_ethernet_header (unformat_input_t * input, va_list * args);
325 /* Parse ethernet interface name; return hw_if_index. */
326 uword unformat_ethernet_interface (unformat_input_t * input, va_list * args);
328 uword unformat_pg_ethernet_header (unformat_input_t * input, va_list * args);
331 ethernet_setup_node (vlib_main_t * vm, u32 node_index)
333 vlib_node_t *n = vlib_get_node (vm, node_index);
334 pg_node_t *pn = pg_get_node (node_index);
336 n->format_buffer = format_ethernet_header_with_length;
337 n->unformat_buffer = unformat_ethernet_header;
338 pn->unformat_edit = unformat_pg_ethernet_header;
341 always_inline ethernet_header_t *
342 ethernet_buffer_get_header (vlib_buffer_t * b)
345 (b->data + vnet_buffer (b)->ethernet.start_of_ethernet_header);
348 /** Returns the number of VLAN headers in the current Ethernet frame in the
349 * buffer. Returns 0, 1, 2 for the known header count. The value 3 indicates
350 * the number of headers is not known.
352 #define ethernet_buffer_get_vlan_count(b) ( \
353 ((b)->flags & ETH_BUFFER_VLAN_BITS) >> LOG2_ETH_BUFFER_VLAN_1_DEEP \
356 /** Sets the number of VLAN headers in the current Ethernet frame in the
357 * buffer. Values 0, 1, 2 indicate the header count. The value 3 indicates
358 * the number of headers is not known.
360 #define ethernet_buffer_set_vlan_count(b, v) ( \
361 (b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) | \
362 (((v) << LOG2_ETH_BUFFER_VLAN_1_DEEP) & ETH_BUFFER_VLAN_BITS) \
365 /** Adjusts the vlan count by the delta in 'v' */
366 #define ethernet_buffer_adjust_vlan_count(b, v) ( \
367 ethernet_buffer_set_vlan_count(b, \
368 (word)ethernet_buffer_get_vlan_count(b) + (word)(v)) \
371 /** Adjusts the vlan count by the header size byte delta in 'v' */
372 #define ethernet_buffer_adjust_vlan_count_by_bytes(b, v) ( \
373 (b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) | (( \
374 ((b)->flags & ETH_BUFFER_VLAN_BITS) + \
375 ((v) << (LOG2_ETH_BUFFER_VLAN_1_DEEP - 2)) \
376 ) & ETH_BUFFER_VLAN_BITS) \
380 * Determine the size of the Ethernet headers of the current frame in
381 * the buffer. This uses the VLAN depth flags that are set by
382 * ethernet-input. Because these flags are stored in the vlib_buffer_t
383 * "flags" field this count is valid regardless of the node so long as it's
384 * checked downstream of ethernet-input; That is, the value is not stored in
387 #define ethernet_buffer_header_size(b) ( \
388 ethernet_buffer_get_vlan_count((b)) * sizeof(ethernet_vlan_header_t) + \
389 sizeof(ethernet_header_t) \
392 ethernet_main_t *ethernet_get_main (vlib_main_t * vm);
393 u32 ethernet_set_flags (vnet_main_t * vnm, u32 hw_if_index, u32 flags);
394 void ethernet_sw_interface_set_l2_mode (vnet_main_t * vnm, u32 sw_if_index,
396 void ethernet_sw_interface_set_l2_mode_noport (vnet_main_t * vnm,
397 u32 sw_if_index, u32 l2);
398 void ethernet_set_rx_redirect (vnet_main_t * vnm, vnet_hw_interface_t * hi,
402 vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
403 u32 sw_if_index, void *a_arg, int is_static);
406 vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
407 u32 sw_if_index, void *a_arg);
409 int vnet_proxy_arp_fib_reset (u32 fib_id);
411 clib_error_t *next_by_ethertype_init (next_by_ethertype_t * l3_next);
412 clib_error_t *next_by_ethertype_register (next_by_ethertype_t * l3_next,
413 u32 ethertype, u32 next_index);
415 int vnet_create_loopback_interface (u32 * sw_if_indexp, u8 * mac_address);
416 int vnet_delete_loopback_interface (u32 sw_if_index);
417 int vnet_delete_sub_interface (u32 sw_if_index);
419 // Perform ethernet subinterface classification table lookups given
420 // the ports's sw_if_index and fields extracted from the ethernet header.
421 // The resulting tables are used by identify_subint().
423 eth_vlan_table_lookups (ethernet_main_t * em,
425 u32 port_sw_if_index0,
429 vnet_hw_interface_t ** hi,
430 main_intf_t ** main_intf,
431 vlan_intf_t ** vlan_intf, qinq_intf_t ** qinq_intf)
433 vlan_table_t *vlan_table;
434 qinq_table_t *qinq_table;
437 // Read the main, vlan, and qinq interface table entries
438 // TODO: Consider if/how to prefetch tables. Also consider
439 // single-entry cache to skip table lookups and identify_subint()
441 *hi = vnet_get_sup_hw_interface (vnm, port_sw_if_index0);
442 *main_intf = vec_elt_at_index (em->main_intfs, (*hi)->hw_if_index);
444 // Always read the vlan and qinq tables, even if there are not that
445 // many tags on the packet. This makes the lookups and comparisons
446 // easier (and less branchy).
447 vlan_table_id = (first_ethertype == ETHERNET_TYPE_DOT1AD) ?
448 (*main_intf)->dot1ad_vlans : (*main_intf)->dot1q_vlans;
449 vlan_table = vec_elt_at_index (em->vlan_pool, vlan_table_id);
450 *vlan_intf = &vlan_table->vlans[outer_id];
452 qinq_table = vec_elt_at_index (em->qinq_pool, (*vlan_intf)->qinqs);
453 *qinq_intf = &qinq_table->vlans[inner_id];
457 // Determine the subinterface for this packet, given the result of the
458 // vlan table lookups and vlan header parsing. Check the most specific
460 // Returns 1 if a matching subinterface was found, otherwise returns 0.
462 eth_identify_subint (vnet_hw_interface_t * hi,
465 main_intf_t * main_intf,
466 vlan_intf_t * vlan_intf,
467 qinq_intf_t * qinq_intf,
468 u32 * new_sw_if_index, u8 * error0, u32 * is_l2)
470 subint_config_t *subint;
472 // Each comparison is checking both the valid flag and the number of tags
473 // (incorporating exact-match/non-exact-match).
475 // check for specific double tag
476 subint = &qinq_intf->subint;
477 if ((subint->flags & match_flags) == match_flags)
480 // check for specific outer and 'any' inner
481 subint = &vlan_intf->inner_any_subint;
482 if ((subint->flags & match_flags) == match_flags)
485 // check for specific single tag
486 subint = &vlan_intf->single_tag_subint;
487 if ((subint->flags & match_flags) == match_flags)
490 // check for untagged interface
491 subint = &main_intf->untagged_subint;
492 if ((subint->flags & match_flags) == match_flags)
495 // check for default interface
496 subint = &main_intf->default_subint;
497 if ((subint->flags & match_flags) == match_flags)
500 // No matching subinterface
501 *new_sw_if_index = ~0;
502 *error0 = ETHERNET_ERROR_UNKNOWN_VLAN;
507 *new_sw_if_index = subint->sw_if_index;
508 *is_l2 = subint->flags & SUBINT_CONFIG_L2;
512 // Compare two ethernet macs. Return 1 if they are the same, 0 if different
514 eth_mac_equal (u8 * mac1, u8 * mac2)
516 return (*((u32 *) (mac1 + 0)) == *((u32 *) (mac2 + 0)) &&
517 *((u32 *) (mac1 + 2)) == *((u32 *) (mac2 + 2)));
521 always_inline ethernet_main_t *
522 vnet_get_ethernet_main (void)
524 return ðernet_main;
527 void vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
530 uword type_opaque, uword data);
533 int vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
539 uword data, int is_add);
541 void ethernet_arp_change_mac (vnet_main_t * vnm, u32 sw_if_index);
543 void arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai);
545 void ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai);
546 u8 *ethernet_build_rewrite (vnet_main_t * vnm,
548 vnet_link_t link_type, const void *dst_address);
550 extern vlib_node_registration_t ethernet_input_node;
552 #endif /* included_ethernet_h */
555 * fd.io coding-style-patch-verification: ON
558 * eval: (c-set-style "gnu")