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+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * ethernet.h: types/functions for ethernet.
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef included_ethernet_h
+#define included_ethernet_h
+
+#include <vnet/vnet.h>
+#include <vnet/ethernet/packet.h>
+#include <vnet/pg/pg.h>
+#include <vnet/feature/feature.h>
+
+always_inline u64
+ethernet_mac_address_u64 (u8 * a)
+{
+ return (((u64) a[0] << (u64) (5 * 8))
+ | ((u64) a[1] << (u64) (4 * 8))
+ | ((u64) a[2] << (u64) (3 * 8))
+ | ((u64) a[3] << (u64) (2 * 8))
+ | ((u64) a[4] << (u64) (1 * 8)) | ((u64) a[5] << (u64) (0 * 8)));
+}
+
+static inline int
+ethernet_mac_address_is_multicast_u64 (u64 a)
+{
+ return (a & (1ULL << (5 * 8))) != 0;
+}
+
+static_always_inline int
+ethernet_frame_is_tagged (u16 type)
+{
+#if __SSE4_2__
+ const __m128i ethertype_mask = _mm_set_epi16 (ETHERNET_TYPE_VLAN,
+ ETHERNET_TYPE_DOT1AD,
+ ETHERNET_TYPE_VLAN_9100,
+ ETHERNET_TYPE_VLAN_9200,
+ /* duplicate last one to
+ fill register */
+ ETHERNET_TYPE_VLAN_9200,
+ ETHERNET_TYPE_VLAN_9200,
+ ETHERNET_TYPE_VLAN_9200,
+ ETHERNET_TYPE_VLAN_9200);
+
+ __m128i r = _mm_set1_epi16 (type);
+ r = _mm_cmpeq_epi16 (ethertype_mask, r);
+ return !_mm_test_all_zeros (r, r);
+#else
+ if ((type == ETHERNET_TYPE_VLAN) ||
+ (type == ETHERNET_TYPE_DOT1AD) ||
+ (type == ETHERNET_TYPE_VLAN_9100) || (type == ETHERNET_TYPE_VLAN_9200))
+ return 1;
+#endif
+ return 0;
+}
+
+/* Max. sized ethernet/vlan header for parsing. */
+typedef struct
+{
+ ethernet_header_t ethernet;
+
+ /* Allow up to 2 stacked vlan headers. */
+ ethernet_vlan_header_t vlan[2];
+} ethernet_max_header_t;
+
+struct vnet_hw_interface_t;
+/* Ethernet flag change callback. */
+typedef u32 (ethernet_flag_change_function_t)
+ (vnet_main_t * vnm, struct vnet_hw_interface_t * hi, u32 flags);
+
+#define ETHERNET_MIN_PACKET_BYTES 64
+#define ETHERNET_MAX_PACKET_BYTES 9216
+
+/* Ethernet interface instance. */
+typedef struct ethernet_interface
+{
+
+ /* Accept all packets (promiscuous mode). */
+#define ETHERNET_INTERFACE_FLAG_ACCEPT_ALL (1 << 0)
+#define ETHERNET_INTERFACE_FLAG_CONFIG_PROMISC(flags) \
+ (((flags) & ~ETHERNET_INTERFACE_FLAG_ACCEPT_ALL) == 0)
+
+ /* Change MTU on interface from hw interface structure */
+#define ETHERNET_INTERFACE_FLAG_MTU (1 << 1)
+#define ETHERNET_INTERFACE_FLAG_CONFIG_MTU(flags) \
+ ((flags) & ETHERNET_INTERFACE_FLAG_MTU)
+
+ /* Callback, e.g. to turn on/off promiscuous mode */
+ ethernet_flag_change_function_t *flag_change;
+
+ u32 driver_instance;
+
+ /* Ethernet (MAC) address for this interface. */
+ u8 address[6];
+} ethernet_interface_t;
+
+extern vnet_hw_interface_class_t ethernet_hw_interface_class;
+
+typedef struct
+{
+ /* Name (a c string). */
+ char *name;
+
+ /* Ethernet type in host byte order. */
+ ethernet_type_t type;
+
+ /* Node which handles this type. */
+ u32 node_index;
+
+ /* Next index for this type. */
+ u32 next_index;
+} ethernet_type_info_t;
+
+typedef enum
+{
+#define ethernet_error(n,c,s) ETHERNET_ERROR_##n,
+#include <vnet/ethernet/error.def>
+#undef ethernet_error
+ ETHERNET_N_ERROR,
+} ethernet_error_t;
+
+
+// Structs used when parsing packet to find sw_if_index
+
+typedef struct
+{
+ u32 sw_if_index;
+ u32 flags;
+ // config entry is-valid flag
+ // exact match flags (valid if packet has 0/1/2/3 tags)
+ // L2 vs L3 forwarding mode
+#define SUBINT_CONFIG_MATCH_0_TAG (1<<0)
+#define SUBINT_CONFIG_MATCH_1_TAG (1<<1)
+#define SUBINT_CONFIG_MATCH_2_TAG (1<<2)
+#define SUBINT_CONFIG_MATCH_3_TAG (1<<3)
+#define SUBINT_CONFIG_VALID (1<<4)
+#define SUBINT_CONFIG_L2 (1<<5)
+
+} subint_config_t;
+
+always_inline u32
+eth_create_valid_subint_match_flags (u32 num_tags)
+{
+ return SUBINT_CONFIG_VALID | (1 << num_tags);
+}
+
+
+typedef struct
+{
+ subint_config_t untagged_subint;
+ subint_config_t default_subint;
+ u16 dot1q_vlans; // pool id for vlan table
+ u16 dot1ad_vlans; // pool id for vlan table
+} main_intf_t;
+
+typedef struct
+{
+ subint_config_t single_tag_subint;
+ subint_config_t inner_any_subint;
+ u32 qinqs; // pool id for qinq table
+} vlan_intf_t;
+
+typedef struct
+{
+ vlan_intf_t vlans[ETHERNET_N_VLAN];
+} vlan_table_t;
+
+typedef struct
+{
+ subint_config_t subint;
+} qinq_intf_t;
+
+typedef struct
+{
+ qinq_intf_t vlans[ETHERNET_N_VLAN];
+} qinq_table_t;
+
+// Structure mapping to a next index based on ethertype.
+// Common ethertypes are stored explicitly, others are
+// stored in a sparse table.
+typedef struct
+{
+ /* Sparse vector mapping ethernet type in network byte order
+ to next index. */
+ u16 *input_next_by_type;
+ u32 *sparse_index_by_input_next_index;
+
+ /* cached next indexes for common ethertypes */
+ u32 input_next_ip4;
+ u32 input_next_ip6;
+ u32 input_next_mpls;
+} next_by_ethertype_t;
+
+typedef struct
+{
+ vlib_main_t *vlib_main;
+
+ /* next node index for the L3 input node of each ethertype */
+ next_by_ethertype_t l3_next;
+
+ /* next node index for L2 interfaces */
+ u32 l2_next;
+
+ /* flag and next node index for L3 redirect */
+ u32 redirect_l3;
+ u32 redirect_l3_next;
+
+ /* Pool of ethernet interface instances. */
+ ethernet_interface_t *interfaces;
+
+ ethernet_type_info_t *type_infos;
+
+ /* Hash tables mapping name/type to type info index. */
+ uword *type_info_by_name, *type_info_by_type;
+
+ // The root of the vlan parsing tables. A vector with one element
+ // for each main interface, indexed by hw_if_index.
+ main_intf_t *main_intfs;
+
+ // Pool of vlan tables
+ vlan_table_t *vlan_pool;
+
+ // Pool of qinq tables;
+ qinq_table_t *qinq_pool;
+
+ /* Set to one to use AB.CD.EF instead of A:B:C:D:E:F as ethernet format. */
+ int format_ethernet_address_16bit;
+
+ /* debug: make sure we don't wipe out an ethernet registration by mistake */
+ u8 next_by_ethertype_register_called;
+
+ /* Feature arc index */
+ u8 output_feature_arc_index;
+} ethernet_main_t;
+
+ethernet_main_t ethernet_main;
+
+always_inline ethernet_type_info_t *
+ethernet_get_type_info (ethernet_main_t * em, ethernet_type_t type)
+{
+ uword *p = hash_get (em->type_info_by_type, type);
+ return p ? vec_elt_at_index (em->type_infos, p[0]) : 0;
+}
+
+ethernet_interface_t *ethernet_get_interface (ethernet_main_t * em,
+ u32 hw_if_index);
+
+clib_error_t *ethernet_register_interface (vnet_main_t * vnm,
+ u32 dev_class_index,
+ u32 dev_instance,
+ u8 * address,
+ u32 * hw_if_index_return,
+ ethernet_flag_change_function_t
+ flag_change);
+
+void ethernet_delete_interface (vnet_main_t * vnm, u32 hw_if_index);
+
+/* Register given node index to take input for given ethernet type. */
+void
+ethernet_register_input_type (vlib_main_t * vm,
+ ethernet_type_t type, u32 node_index);
+
+/* Register given node index to take input for packet from L2 interfaces. */
+void ethernet_register_l2_input (vlib_main_t * vm, u32 node_index);
+
+/* Register given node index to take redirected L3 traffic, and enable L3 redirect */
+void ethernet_register_l3_redirect (vlib_main_t * vm, u32 node_index);
+
+/* Formats ethernet address X:X:X:X:X:X */
+u8 *format_ethernet_address (u8 * s, va_list * args);
+u8 *format_ethernet_type (u8 * s, va_list * args);
+u8 *format_ethernet_vlan_tci (u8 * s, va_list * va);
+u8 *format_ethernet_header (u8 * s, va_list * args);
+u8 *format_ethernet_header_with_length (u8 * s, va_list * args);
+
+/* Parse ethernet address in either X:X:X:X:X:X unix or X.X.X cisco format. */
+uword unformat_ethernet_address (unformat_input_t * input, va_list * args);
+
+/* Parse ethernet type as 0xXXXX or type name from ethernet/types.def.
+ In either host or network byte order. */
+uword
+unformat_ethernet_type_host_byte_order (unformat_input_t * input,
+ va_list * args);
+uword
+unformat_ethernet_type_net_byte_order (unformat_input_t * input,
+ va_list * args);
+
+/* Parse ethernet header. */
+uword unformat_ethernet_header (unformat_input_t * input, va_list * args);
+
+/* Parse ethernet interface name; return hw_if_index. */
+uword unformat_ethernet_interface (unformat_input_t * input, va_list * args);
+
+uword unformat_pg_ethernet_header (unformat_input_t * input, va_list * args);
+
+always_inline void
+ethernet_setup_node (vlib_main_t * vm, u32 node_index)
+{
+ vlib_node_t *n = vlib_get_node (vm, node_index);
+ pg_node_t *pn = pg_get_node (node_index);
+
+ n->format_buffer = format_ethernet_header_with_length;
+ n->unformat_buffer = unformat_ethernet_header;
+ pn->unformat_edit = unformat_pg_ethernet_header;
+}
+
+always_inline ethernet_header_t *
+ethernet_buffer_get_header (vlib_buffer_t * b)
+{
+ return (void *)
+ (b->data + vnet_buffer (b)->ethernet.start_of_ethernet_header);
+}
+
+/** Returns the number of VLAN headers in the current Ethernet frame in the
+ * buffer. Returns 0, 1, 2 for the known header count. The value 3 indicates
+ * the number of headers is not known.
+ */
+#define ethernet_buffer_get_vlan_count(b) ( \
+ ((b)->flags & ETH_BUFFER_VLAN_BITS) >> LOG2_ETH_BUFFER_VLAN_1_DEEP \
+)
+
+/** Sets the number of VLAN headers in the current Ethernet frame in the
+ * buffer. Values 0, 1, 2 indicate the header count. The value 3 indicates
+ * the number of headers is not known.
+ */
+#define ethernet_buffer_set_vlan_count(b, v) ( \
+ (b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) | \
+ (((v) << LOG2_ETH_BUFFER_VLAN_1_DEEP) & ETH_BUFFER_VLAN_BITS) \
+)
+
+/** Adjusts the vlan count by the delta in 'v' */
+#define ethernet_buffer_adjust_vlan_count(b, v) ( \
+ ethernet_buffer_set_vlan_count(b, \
+ (word)ethernet_buffer_get_vlan_count(b) + (word)(v)) \
+)
+
+/** Adjusts the vlan count by the header size byte delta in 'v' */
+#define ethernet_buffer_adjust_vlan_count_by_bytes(b, v) ( \
+ (b)->flags = ((b)->flags & ~ETH_BUFFER_VLAN_BITS) | (( \
+ ((b)->flags & ETH_BUFFER_VLAN_BITS) + \
+ ((v) << (LOG2_ETH_BUFFER_VLAN_1_DEEP - 2)) \
+ ) & ETH_BUFFER_VLAN_BITS) \
+)
+
+/**
+ * Determine the size of the Ethernet headers of the current frame in
+ * the buffer. This uses the VLAN depth flags that are set by
+ * ethernet-input. Because these flags are stored in the vlib_buffer_t
+ * "flags" field this count is valid regardless of the node so long as it's
+ * checked downstream of ethernet-input; That is, the value is not stored in
+ * the opaque space.
+ */
+#define ethernet_buffer_header_size(b) ( \
+ ethernet_buffer_get_vlan_count((b)) * sizeof(ethernet_vlan_header_t) + \
+ sizeof(ethernet_header_t) \
+)
+
+ethernet_main_t *ethernet_get_main (vlib_main_t * vm);
+u32 ethernet_set_flags (vnet_main_t * vnm, u32 hw_if_index, u32 flags);
+void ethernet_sw_interface_set_l2_mode (vnet_main_t * vnm, u32 sw_if_index,
+ u32 l2);
+void ethernet_sw_interface_set_l2_mode_noport (vnet_main_t * vnm,
+ u32 sw_if_index, u32 l2);
+void ethernet_set_rx_redirect (vnet_main_t * vnm, vnet_hw_interface_t * hi,
+ u32 enable);
+
+int
+vnet_arp_set_ip4_over_ethernet (vnet_main_t * vnm,
+ u32 sw_if_index, void *a_arg, int is_static);
+
+int
+vnet_arp_unset_ip4_over_ethernet (vnet_main_t * vnm,
+ u32 sw_if_index, void *a_arg);
+
+int vnet_proxy_arp_fib_reset (u32 fib_id);
+
+clib_error_t *next_by_ethertype_init (next_by_ethertype_t * l3_next);
+clib_error_t *next_by_ethertype_register (next_by_ethertype_t * l3_next,
+ u32 ethertype, u32 next_index);
+
+int vnet_create_loopback_interface (u32 * sw_if_indexp, u8 * mac_address);
+int vnet_delete_loopback_interface (u32 sw_if_index);
+int vnet_delete_sub_interface (u32 sw_if_index);
+
+// Perform ethernet subinterface classification table lookups given
+// the ports's sw_if_index and fields extracted from the ethernet header.
+// The resulting tables are used by identify_subint().
+always_inline void
+eth_vlan_table_lookups (ethernet_main_t * em,
+ vnet_main_t * vnm,
+ u32 port_sw_if_index0,
+ u16 first_ethertype,
+ u16 outer_id,
+ u16 inner_id,
+ vnet_hw_interface_t ** hi,
+ main_intf_t ** main_intf,
+ vlan_intf_t ** vlan_intf, qinq_intf_t ** qinq_intf)
+{
+ vlan_table_t *vlan_table;
+ qinq_table_t *qinq_table;
+ u32 vlan_table_id;
+
+ // Read the main, vlan, and qinq interface table entries
+ // TODO: Consider if/how to prefetch tables. Also consider
+ // single-entry cache to skip table lookups and identify_subint()
+ // processing.
+ *hi = vnet_get_sup_hw_interface (vnm, port_sw_if_index0);
+ *main_intf = vec_elt_at_index (em->main_intfs, (*hi)->hw_if_index);
+
+ // Always read the vlan and qinq tables, even if there are not that
+ // many tags on the packet. This makes the lookups and comparisons
+ // easier (and less branchy).
+ vlan_table_id = (first_ethertype == ETHERNET_TYPE_DOT1AD) ?
+ (*main_intf)->dot1ad_vlans : (*main_intf)->dot1q_vlans;
+ vlan_table = vec_elt_at_index (em->vlan_pool, vlan_table_id);
+ *vlan_intf = &vlan_table->vlans[outer_id];
+
+ qinq_table = vec_elt_at_index (em->qinq_pool, (*vlan_intf)->qinqs);
+ *qinq_intf = &qinq_table->vlans[inner_id];
+}
+
+
+// Determine the subinterface for this packet, given the result of the
+// vlan table lookups and vlan header parsing. Check the most specific
+// matches first.
+// Returns 1 if a matching subinterface was found, otherwise returns 0.
+always_inline u32
+eth_identify_subint (vnet_hw_interface_t * hi,
+ vlib_buffer_t * b0,
+ u32 match_flags,
+ main_intf_t * main_intf,
+ vlan_intf_t * vlan_intf,
+ qinq_intf_t * qinq_intf,
+ u32 * new_sw_if_index, u8 * error0, u32 * is_l2)
+{
+ subint_config_t *subint;
+
+ // Each comparison is checking both the valid flag and the number of tags
+ // (incorporating exact-match/non-exact-match).
+
+ // check for specific double tag
+ subint = &qinq_intf->subint;
+ if ((subint->flags & match_flags) == match_flags)
+ goto matched;
+
+ // check for specific outer and 'any' inner
+ subint = &vlan_intf->inner_any_subint;
+ if ((subint->flags & match_flags) == match_flags)
+ goto matched;
+
+ // check for specific single tag
+ subint = &vlan_intf->single_tag_subint;
+ if ((subint->flags & match_flags) == match_flags)
+ goto matched;
+
+ // check for untagged interface
+ subint = &main_intf->untagged_subint;
+ if ((subint->flags & match_flags) == match_flags)
+ goto matched;
+
+ // check for default interface
+ subint = &main_intf->default_subint;
+ if ((subint->flags & match_flags) == match_flags)
+ goto matched;
+
+ // No matching subinterface
+ *new_sw_if_index = ~0;
+ *error0 = ETHERNET_ERROR_UNKNOWN_VLAN;
+ *is_l2 = 0;
+ return 0;
+
+matched:
+ *new_sw_if_index = subint->sw_if_index;
+ *is_l2 = subint->flags & SUBINT_CONFIG_L2;
+ return 1;
+}
+
+// Compare two ethernet macs. Return 1 if they are the same, 0 if different
+always_inline u32
+eth_mac_equal (u8 * mac1, u8 * mac2)
+{
+ return (*((u32 *) (mac1 + 0)) == *((u32 *) (mac2 + 0)) &&
+ *((u32 *) (mac1 + 2)) == *((u32 *) (mac2 + 2)));
+}
+
+
+always_inline ethernet_main_t *
+vnet_get_ethernet_main (void)
+{
+ return &ethernet_main;
+}
+
+void vnet_register_ip4_arp_resolution_event (vnet_main_t * vnm,
+ void *address_arg,
+ uword node_index,
+ uword type_opaque, uword data);
+
+
+int vnet_add_del_ip4_arp_change_event (vnet_main_t * vnm,
+ void *data_callback,
+ u32 pid,
+ void *address_arg,
+ uword node_index,
+ uword type_opaque,
+ uword data, int is_add);
+
+void ethernet_arp_change_mac (u32 sw_if_index);
+void ethernet_ndp_change_mac (u32 sw_if_index);
+
+void arp_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai);
+
+void ethernet_update_adjacency (vnet_main_t * vnm, u32 sw_if_index, u32 ai);
+u8 *ethernet_build_rewrite (vnet_main_t * vnm,
+ u32 sw_if_index,
+ vnet_link_t link_type, const void *dst_address);
+
+extern vlib_node_registration_t ethernet_input_node;
+
+#endif /* included_ethernet_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */