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
32 u16 bd_index; // bridge domain id
33 u32 output_sw_if_index; // for xconnect
36 // Interface mode. If both are 0, this interface is in L3 mode
40 // this is the bvi interface for the bridge-domain
43 // config for which input features are configured on this interface
46 // some of these flags are also in the feature bitmap
51 // split horizon group
59 // Next nodes for the feature bitmap
60 u32 feat_next_node_index[32];
62 /* config vector indexed by sw_if_index */
63 l2_input_config_t *configs;
65 /* bridge domain config vector indexed by BD ID */
66 l2_bridge_domain_t *bd_configs;
68 /* convenience variables */
69 vlib_main_t * vlib_main;
70 vnet_main_t * vnet_main;
73 extern l2input_main_t l2input_main;
75 extern vlib_node_registration_t l2input_node;
77 static_always_inline l2_bridge_domain_t *
78 l2input_bd_config_from_index (l2input_main_t * l2im, u32 bd_index)
80 l2_bridge_domain_t * bd_config;
82 bd_config = vec_elt_at_index (l2im->bd_configs, bd_index);
83 return bd_is_valid (bd_config) ? bd_config : NULL;
88 // Mappings from feature ID to graph node name
89 #define foreach_l2input_feat \
90 _(DROP, "feature-bitmap-drop") \
91 _(CLASSIFY, "l2-classify") \
92 _(XCONNECT, "l2-output") \
93 _(IPIW, "feature-bitmap-drop") \
94 _(FLOOD, "l2-flood") \
95 _(ARP_TERM, "arp-term-l2bd") \
96 _(UU_FLOOD, "l2-flood") \
99 _(LEARN, "l2-learn") \
100 _(VTR, "l2-input-vtr") \
101 _(VPATH, "vpath-input-l2") \
102 _(CTRL_PKT, "feature-bitmap-drop") \
103 _(L2PT, "feature-bitmap-drop") \
104 _(IGMP_SNOOP, "feature-bitmap-drop") \
105 _(MLD_SNOOP, "feature-bitmap-drop") \
106 _(DHCP_SNOOP, "feature-bitmap-drop") \
107 _(DAI, "feature-bitmap-drop") \
108 _(IPSG, "feature-bitmap-drop") \
109 _(ACL, "l2-input-acl") \
110 _(QOS, "feature-bitmap-drop") \
111 _(CFM, "feature-bitmap-drop") \
112 _(SPAN, "feature-bitmap-drop")
114 // Feature bitmap positions
116 #define _(sym,str) L2INPUT_FEAT_##sym##_BIT,
124 #define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
127 } l2input_feat_masks_t;
129 // Return an array of strings containing graph node names of each feature
130 char **l2input_get_feat_names(void);
133 static_always_inline u8 bd_feature_flood (l2_bridge_domain_t * bd_config)
135 return ((bd_config->feature_bitmap & L2INPUT_FEAT_FLOOD) ==
139 static_always_inline u8 bd_feature_uu_flood (l2_bridge_domain_t * bd_config)
141 return ((bd_config->feature_bitmap & L2INPUT_FEAT_UU_FLOOD) ==
142 L2INPUT_FEAT_UU_FLOOD);
145 static_always_inline u8 bd_feature_forward (l2_bridge_domain_t * bd_config)
147 return ((bd_config->feature_bitmap & L2INPUT_FEAT_FWD) ==
151 static_always_inline u8 bd_feature_learn (l2_bridge_domain_t * bd_config)
153 return ((bd_config->feature_bitmap & L2INPUT_FEAT_LEARN) ==
157 static_always_inline u8 bd_feature_arp_term (l2_bridge_domain_t * bd_config)
159 return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_TERM) ==
160 L2INPUT_FEAT_ARP_TERM);
163 // Masks for eliminating features that do not apply to a packet
165 #define IP4_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
166 L2INPUT_FEAT_MLD_SNOOP | \
167 L2INPUT_FEAT_L2PT | \
171 #define IP6_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
172 L2INPUT_FEAT_IGMP_SNOOP | \
173 L2INPUT_FEAT_L2PT | \
177 #define IP_UDP_TCP_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
178 L2INPUT_FEAT_L2PT | \
179 L2INPUT_FEAT_IGMP_SNOOP | \
180 L2INPUT_FEAT_MLD_SNOOP | \
181 L2INPUT_FEAT_DHCP_SNOOP | \
185 #define MPLS_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
186 L2INPUT_FEAT_L2PT | \
187 L2INPUT_FEAT_IGMP_SNOOP | \
188 L2INPUT_FEAT_MLD_SNOOP | \
189 L2INPUT_FEAT_DHCP_SNOOP | \
194 // Get a pointer to the config for the given interface
195 l2_input_config_t * l2input_intf_config (u32 sw_if_index);
197 // Enable (or disable) the feature in the bitmap for the given interface
198 u32 l2input_intf_bitmap_enable (u32 sw_if_index,
202 //Sets modifies flags from a bridge domain
203 u32 l2input_set_bridge_features(u32 bd_index,
209 #define MODE_L2_BRIDGE 1
211 #define MODE_L2_CLASSIFY 3
213 #define MODE_ERROR_ETH 1
214 #define MODE_ERROR_BVI_DEF 2
216 u32 set_int_l2_mode (vlib_main_t * vm,
217 vnet_main_t * vnet_main,
226 vnet_update_l2_len (vlib_buffer_t * b)
228 ethernet_header_t * eth;
232 /* point at currrent l2 hdr */
233 eth = vlib_buffer_get_current (b);
236 * l2-output pays no attention to this
237 * but the tag push/pop code on an l2 subif needs it.
239 * Determine l2 header len, check for up to 2 vlans
241 vnet_buffer(b)->l2.l2_len = sizeof(ethernet_header_t);
242 ethertype = clib_net_to_host_u16(eth->type);
243 if ((ethertype == ETHERNET_TYPE_VLAN) ||
244 (ethertype == ETHERNET_TYPE_DOT1AD) ||
245 (ethertype == ETHERNET_TYPE_VLAN_9100) ||
246 (ethertype == ETHERNET_TYPE_VLAN_9200)) {
247 ethernet_vlan_header_t * vlan;
248 vnet_buffer(b)->l2.l2_len += sizeof (*vlan);
250 vlan = (void *) (eth+1);
251 ethertype = clib_net_to_host_u16 (vlan->type);
252 if (ethertype == ETHERNET_TYPE_VLAN) {
253 vnet_buffer(b)->l2.l2_len += sizeof (*vlan);
257 ethernet_buffer_set_vlan_count(b, vlan_count);
261 * Compute flow hash of an ethernet packet, use 5-tuple hash if L3 packet
262 * is ip4 or ip6. Otherwise hash on smac/dmac/etype.
263 * The vlib buffer current pointer is expected to be at ethernet header
264 * and vnet l2.l2_len is exppected to be setup already.
266 static inline u32 vnet_l2_compute_flow_hash (vlib_buffer_t *b)
268 ethernet_header_t * eh = vlib_buffer_get_current(b);
269 u8 * l3h = (u8 *)eh + vnet_buffer(b)->l2.l2_len;
270 u16 ethertype = clib_net_to_host_u16(*(u16 *)(l3h - 2));
272 if (ethertype == ETHERNET_TYPE_IP4)
273 return ip4_compute_flow_hash((ip4_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
274 else if (ethertype == ETHERNET_TYPE_IP6)
275 return ip6_compute_flow_hash((ip6_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
279 u32 * ap = (u32 *) &eh->dst_address[2];
280 u32 * bp = (u32 *) &eh->src_address[2];
284 hash_v3_mix32 (a, b, c);
285 hash_v3_finalize32 (a, b, c);