2 * l2_input.h : layer 2 input packet processing
4 * Copyright (c) 2013 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #ifndef included_vnet_l2_input_h
19 #define included_vnet_l2_input_h
21 #include <vlib/vlib.h>
22 #include <vnet/vnet.h>
23 #include <vnet/l2/l2_bd.h>
24 #include <vnet/ethernet/packet.h>
25 #include <vnet/ip/ip.h>
27 /* Per-subinterface L2 feature configuration */
34 u16 bd_index; /* bridge domain id */
35 u32 output_sw_if_index; /* for xconnect */
38 /* Interface mode. If both are 0, this interface is in L3 mode */
42 /* this is the bvi interface for the bridge-domain */
45 /* config for which input features are configured on this interface */
48 /* some of these flags are also in the feature bitmap */
53 /* split horizon group */
56 /* sequence number for interface based flush of MACs */
65 /* Next nodes for the feature bitmap */
66 u32 feat_next_node_index[32];
68 /* config vector indexed by sw_if_index */
69 l2_input_config_t *configs;
71 /* bridge domain config vector indexed by bd_index */
72 l2_bridge_domain_t *bd_configs;
74 /* convenience variables */
75 vlib_main_t *vlib_main;
76 vnet_main_t *vnet_main;
79 extern l2input_main_t l2input_main;
81 extern vlib_node_registration_t l2input_node;
83 static_always_inline l2_bridge_domain_t *
84 l2input_bd_config_from_index (l2input_main_t * l2im, u32 bd_index)
86 l2_bridge_domain_t *bd_config;
88 bd_config = vec_elt_at_index (l2im->bd_configs, bd_index);
89 return bd_is_valid (bd_config) ? bd_config : NULL;
92 static_always_inline l2_bridge_domain_t *
93 l2input_bd_config (u32 bd_index)
95 l2input_main_t *mp = &l2input_main;
96 l2_bridge_domain_t *bd_config;
98 vec_validate (mp->bd_configs, bd_index);
99 bd_config = vec_elt_at_index (mp->bd_configs, bd_index);
103 /* L2 input indication packet is from BVI, using -2 */
104 #define L2INPUT_BVI ((u32) (~0-1))
106 /* L2 input features */
108 /* Mappings from feature ID to graph node name */
109 #define foreach_l2input_feat \
110 _(DROP, "feature-bitmap-drop") \
111 _(XCONNECT, "l2-output") \
112 _(FLOOD, "l2-flood") \
113 _(ARP_TERM, "arp-term-l2bd") \
114 _(UU_FLOOD, "l2-flood") \
117 _(LEARN, "l2-learn") \
118 _(VTR, "l2-input-vtr") \
119 _(VPATH, "vpath-input-l2") \
120 _(ACL, "l2-input-acl") \
121 _(POLICER_CLAS, "l2-policer-classify") \
122 _(INPUT_CLASSIFY, "l2-input-classify")
124 /* Feature bitmap positions */
127 #define _(sym,str) L2INPUT_FEAT_##sym##_BIT,
132 #define _(sym,str) L2INPUT_FEAT_##sym##_BIT |
138 /* Feature bit masks */
141 #define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
144 } l2input_feat_masks_t;
146 /** Return an array of strings containing graph node names of each feature */
147 char **l2input_get_feat_names (void);
150 static_always_inline u8
151 bd_feature_flood (l2_bridge_domain_t * bd_config)
153 return ((bd_config->feature_bitmap & L2INPUT_FEAT_FLOOD) ==
157 static_always_inline u8
158 bd_feature_uu_flood (l2_bridge_domain_t * bd_config)
160 return ((bd_config->feature_bitmap & L2INPUT_FEAT_UU_FLOOD) ==
161 L2INPUT_FEAT_UU_FLOOD);
164 static_always_inline u8
165 bd_feature_forward (l2_bridge_domain_t * bd_config)
167 return ((bd_config->feature_bitmap & L2INPUT_FEAT_FWD) == L2INPUT_FEAT_FWD);
170 static_always_inline u8
171 bd_feature_learn (l2_bridge_domain_t * bd_config)
173 return ((bd_config->feature_bitmap & L2INPUT_FEAT_LEARN) ==
177 static_always_inline u8
178 bd_feature_arp_term (l2_bridge_domain_t * bd_config)
180 return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_TERM) ==
181 L2INPUT_FEAT_ARP_TERM);
184 /** Masks for eliminating features that do not apply to a packet */
186 /** Get a pointer to the config for the given interface */
187 l2_input_config_t *l2input_intf_config (u32 sw_if_index);
189 /* Enable (or disable) the feature in the bitmap for the given interface */
190 u32 l2input_intf_bitmap_enable (u32 sw_if_index,
191 u32 feature_bitmap, u32 enable);
193 /* Sets modifies flags from a bridge domain */
194 u32 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value);
198 #define MODE_L2_BRIDGE 1
200 #define MODE_L2_CLASSIFY 3
202 #define MODE_ERROR_ETH 1
203 #define MODE_ERROR_BVI_DEF 2
205 u32 set_int_l2_mode (vlib_main_t * vm,
206 vnet_main_t * vnet_main,
209 u32 bd_index, u32 bvi, u32 shg, u32 xc_sw_if_index);
212 vnet_update_l2_len (vlib_buffer_t * b)
214 ethernet_header_t *eth;
218 /* point at currrent l2 hdr */
219 eth = vlib_buffer_get_current (b);
222 * l2-output pays no attention to this
223 * but the tag push/pop code on an l2 subif needs it.
225 * Determine l2 header len, check for up to 2 vlans
227 vnet_buffer (b)->l2.l2_len = sizeof (ethernet_header_t);
228 ethertype = clib_net_to_host_u16 (eth->type);
229 if (ethernet_frame_is_tagged (ethertype))
231 ethernet_vlan_header_t *vlan;
232 vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
234 vlan = (void *) (eth + 1);
235 ethertype = clib_net_to_host_u16 (vlan->type);
236 if (ethertype == ETHERNET_TYPE_VLAN)
238 vnet_buffer (b)->l2.l2_len += sizeof (*vlan);
242 ethernet_buffer_set_vlan_count (b, vlan_count);
246 * Compute flow hash of an ethernet packet, use 5-tuple hash if L3 packet
247 * is ip4 or ip6. Otherwise hash on smac/dmac/etype.
248 * The vlib buffer current pointer is expected to be at ethernet header
249 * and vnet l2.l2_len is exppected to be setup already.
252 vnet_l2_compute_flow_hash (vlib_buffer_t * b)
254 ethernet_header_t *eh = vlib_buffer_get_current (b);
255 u8 *l3h = (u8 *) eh + vnet_buffer (b)->l2.l2_len;
256 u16 ethertype = clib_net_to_host_u16 (*(u16 *) (l3h - 2));
258 if (ethertype == ETHERNET_TYPE_IP4)
259 return ip4_compute_flow_hash ((ip4_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
260 else if (ethertype == ETHERNET_TYPE_IP6)
261 return ip6_compute_flow_hash ((ip6_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
265 u32 *ap = (u32 *) & eh->dst_address[2];
266 u32 *bp = (u32 *) & eh->src_address[2];
270 hash_v3_mix32 (a, b, c);
271 hash_v3_finalize32 (a, b, c);
280 * fd.io coding-style-patch-verification: ON
283 * eval: (c-set-style "gnu")