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 static_always_inline l2_bridge_domain_t *
76 l2input_bd_config_from_index (l2input_main_t * l2im, u32 bd_index)
78 l2_bridge_domain_t * bd_config;
80 bd_config = vec_elt_at_index (l2im->bd_configs, bd_index);
81 return bd_is_valid (bd_config) ? bd_config : NULL;
86 // Mappings from feature ID to graph node name
87 #define foreach_l2input_feat \
88 _(DROP, "feature-bitmap-drop") \
89 _(CLASSIFY, "l2-classify") \
90 _(XCONNECT, "l2-output") \
91 _(IPIW, "feature-bitmap-drop") \
92 _(FLOOD, "l2-flood") \
93 _(ARP_TERM, "arp-term-l2bd") \
94 _(UU_FLOOD, "l2-flood") \
96 _(LEARN, "l2-learn") \
97 _(VTR, "l2-input-vtr") \
98 _(VPATH, "vpath-input-l2") \
99 _(CTRL_PKT, "feature-bitmap-drop") \
100 _(L2PT, "feature-bitmap-drop") \
101 _(IGMP_SNOOP, "feature-bitmap-drop") \
102 _(MLD_SNOOP, "feature-bitmap-drop") \
103 _(DHCP_SNOOP, "feature-bitmap-drop") \
104 _(DAI, "feature-bitmap-drop") \
105 _(IPSG, "feature-bitmap-drop") \
106 _(ACL, "l2-input-acl") \
107 _(QOS, "feature-bitmap-drop") \
108 _(CFM, "feature-bitmap-drop") \
109 _(SPAN, "feature-bitmap-drop")
111 // Feature bitmap positions
113 #define _(sym,str) L2INPUT_FEAT_##sym##_BIT,
121 #define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT),
124 } l2input_feat_masks_t;
126 // Return an array of strings containing graph node names of each feature
127 char **l2input_get_feat_names(void);
130 static_always_inline u8 bd_feature_flood (l2_bridge_domain_t * bd_config)
132 return ((bd_config->feature_bitmap & L2INPUT_FEAT_FLOOD) ==
136 static_always_inline u8 bd_feature_uu_flood (l2_bridge_domain_t * bd_config)
138 return ((bd_config->feature_bitmap & L2INPUT_FEAT_UU_FLOOD) ==
139 L2INPUT_FEAT_UU_FLOOD);
142 static_always_inline u8 bd_feature_forward (l2_bridge_domain_t * bd_config)
144 return ((bd_config->feature_bitmap & L2INPUT_FEAT_FWD) ==
148 static_always_inline u8 bd_feature_learn (l2_bridge_domain_t * bd_config)
150 return ((bd_config->feature_bitmap & L2INPUT_FEAT_LEARN) ==
154 static_always_inline u8 bd_feature_arp_term (l2_bridge_domain_t * bd_config)
156 return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_TERM) ==
157 L2INPUT_FEAT_ARP_TERM);
160 // Masks for eliminating features that do not apply to a packet
162 #define IP4_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
163 L2INPUT_FEAT_MLD_SNOOP | \
164 L2INPUT_FEAT_L2PT | \
168 #define IP6_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
169 L2INPUT_FEAT_IGMP_SNOOP | \
170 L2INPUT_FEAT_L2PT | \
174 #define IP_UDP_TCP_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
175 L2INPUT_FEAT_L2PT | \
176 L2INPUT_FEAT_IGMP_SNOOP | \
177 L2INPUT_FEAT_MLD_SNOOP | \
178 L2INPUT_FEAT_DHCP_SNOOP | \
182 #define MPLS_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \
183 L2INPUT_FEAT_L2PT | \
184 L2INPUT_FEAT_IGMP_SNOOP | \
185 L2INPUT_FEAT_MLD_SNOOP | \
186 L2INPUT_FEAT_DHCP_SNOOP | \
191 // Get a pointer to the config for the given interface
192 l2_input_config_t * l2input_intf_config (u32 sw_if_index);
194 // Enable (or disable) the feature in the bitmap for the given interface
195 u32 l2input_intf_bitmap_enable (u32 sw_if_index,
201 #define MODE_L2_BRIDGE 1
203 #define MODE_L2_CLASSIFY 3
205 #define MODE_ERROR_ETH 1
206 #define MODE_ERROR_BVI_DEF 2
208 u32 set_int_l2_mode (vlib_main_t * vm,
209 vnet_main_t * vnet_main,
218 vnet_update_l2_len (vlib_buffer_t * b)
220 ethernet_header_t * eth;
223 /* point at currrent l2 hdr */
224 eth = vlib_buffer_get_current (b);
227 * l2-output pays no attention to this
228 * but the tag push/pop code on an l2 subif needs it.
230 * Determine l2 header len, check for up to 2 vlans
232 vnet_buffer(b)->l2.l2_len = sizeof(ethernet_header_t);
233 ethertype = clib_net_to_host_u16(eth->type);
234 if ((ethertype == ETHERNET_TYPE_VLAN) ||
235 (ethertype == ETHERNET_TYPE_DOT1AD) ||
236 (ethertype == ETHERNET_TYPE_VLAN_9100) ||
237 (ethertype == ETHERNET_TYPE_VLAN_9200)) {
238 ethernet_vlan_header_t * vlan;
239 vnet_buffer(b)->l2.l2_len += sizeof (*vlan);
240 vlan = (void *) (eth+1);
241 ethertype = clib_net_to_host_u16 (vlan->type);
242 if (ethertype == ETHERNET_TYPE_VLAN) {
243 vnet_buffer(b)->l2.l2_len += sizeof (*vlan);
249 * Compute flow hash of an ethernet packet, use 5-tuple hash if L3 packet
250 * is ip4 or ip6. Otherwise hash on smac/dmac/etype.
251 * The vlib buffer current pointer is expected to be at ethernet header
252 * and vnet l2.l2_len is exppected to be setup already.
254 static inline u32 vnet_l2_compute_flow_hash (vlib_buffer_t *b)
256 ethernet_header_t * eh = vlib_buffer_get_current(b);
257 u8 * l3h = (u8 *)eh + vnet_buffer(b)->l2.l2_len;
258 u16 ethertype = clib_net_to_host_u16(*(u16 *)(l3h - 2));
260 if (ethertype == ETHERNET_TYPE_IP4)
261 return ip4_compute_flow_hash((ip4_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
262 else if (ethertype == ETHERNET_TYPE_IP6)
263 return ip6_compute_flow_hash((ip6_header_t *) l3h, IP_FLOW_HASH_DEFAULT);
267 u32 * ap = (u32 *) &eh->dst_address[2];
268 u32 * bp = (u32 *) &eh->src_address[2];
272 hash_v3_mix32 (a, b, c);
273 hash_v3_finalize32 (a, b, c);