/* * l2_input.h : layer 2 input packet processing * * Copyright (c) 2013 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. */ #ifndef included_vnet_l2_input_h #define included_vnet_l2_input_h #include #include #include #include #include // Per-subinterface L2 feature configuration typedef struct { union { u16 bd_index; // bridge domain id u32 output_sw_if_index; // for xconnect }; // Interface mode. If both are 0, this interface is in L3 mode u8 xconnect; u8 bridge; // this is the bvi interface for the bridge-domain u8 bvi; // config for which input features are configured on this interface u32 feature_bitmap; // some of these flags are also in the feature bitmap u8 learn_enable; u8 fwd_enable; u8 flood_enable; // split horizon group u8 shg; } l2_input_config_t; typedef struct { // Next nodes for the feature bitmap u32 feat_next_node_index[32]; /* config vector indexed by sw_if_index */ l2_input_config_t *configs; /* bridge domain config vector indexed by BD ID */ l2_bridge_domain_t *bd_configs; /* convenience variables */ vlib_main_t * vlib_main; vnet_main_t * vnet_main; } l2input_main_t; extern l2input_main_t l2input_main; static_always_inline l2_bridge_domain_t * l2input_bd_config_from_index (l2input_main_t * l2im, u32 bd_index) { l2_bridge_domain_t * bd_config; bd_config = vec_elt_at_index (l2im->bd_configs, bd_index); return bd_is_valid (bd_config) ? bd_config : NULL; } // L2 input features // Mappings from feature ID to graph node name #define foreach_l2input_feat \ _(DROP, "feature-bitmap-drop") \ _(CLASSIFY, "l2-classify") \ _(XCONNECT, "l2-output") \ _(IPIW, "feature-bitmap-drop") \ _(FLOOD, "l2-flood") \ _(ARP_TERM, "arp-term-l2bd") \ _(UU_FLOOD, "l2-flood") \ _(FWD, "l2-fwd") \ _(LEARN, "l2-learn") \ _(VTR, "l2-input-vtr") \ _(VPATH, "vpath-input-l2") \ _(CTRL_PKT, "feature-bitmap-drop") \ _(L2PT, "feature-bitmap-drop") \ _(IGMP_SNOOP, "feature-bitmap-drop") \ _(MLD_SNOOP, "feature-bitmap-drop") \ _(DHCP_SNOOP, "feature-bitmap-drop") \ _(DAI, "feature-bitmap-drop") \ _(IPSG, "feature-bitmap-drop") \ _(ACL, "l2-input-acl") \ _(QOS, "feature-bitmap-drop") \ _(CFM, "feature-bitmap-drop") \ _(SPAN, "feature-bitmap-drop") // Feature bitmap positions typedef enum { #define _(sym,str) L2INPUT_FEAT_##sym##_BIT, foreach_l2input_feat #undef _ L2INPUT_N_FEAT, } l2input_feat_t; // Feature bit masks typedef enum { #define _(sym,str) L2INPUT_FEAT_##sym = (1<feature_bitmap & L2INPUT_FEAT_FLOOD) == L2INPUT_FEAT_FLOOD); } static_always_inline u8 bd_feature_uu_flood (l2_bridge_domain_t * bd_config) { return ((bd_config->feature_bitmap & L2INPUT_FEAT_UU_FLOOD) == L2INPUT_FEAT_UU_FLOOD); } static_always_inline u8 bd_feature_forward (l2_bridge_domain_t * bd_config) { return ((bd_config->feature_bitmap & L2INPUT_FEAT_FWD) == L2INPUT_FEAT_FWD); } static_always_inline u8 bd_feature_learn (l2_bridge_domain_t * bd_config) { return ((bd_config->feature_bitmap & L2INPUT_FEAT_LEARN) == L2INPUT_FEAT_LEARN); } static_always_inline u8 bd_feature_arp_term (l2_bridge_domain_t * bd_config) { return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_TERM) == L2INPUT_FEAT_ARP_TERM); } // Masks for eliminating features that do not apply to a packet #define IP4_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \ L2INPUT_FEAT_MLD_SNOOP | \ L2INPUT_FEAT_L2PT | \ L2INPUT_FEAT_CFM | \ L2INPUT_FEAT_DAI) #define IP6_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \ L2INPUT_FEAT_IGMP_SNOOP | \ L2INPUT_FEAT_L2PT | \ L2INPUT_FEAT_CFM | \ L2INPUT_FEAT_DAI) #define IP_UDP_TCP_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \ L2INPUT_FEAT_L2PT | \ L2INPUT_FEAT_IGMP_SNOOP | \ L2INPUT_FEAT_MLD_SNOOP | \ L2INPUT_FEAT_DHCP_SNOOP | \ L2INPUT_FEAT_CFM | \ L2INPUT_FEAT_DAI) #define MPLS_FEAT_MASK ~(L2INPUT_FEAT_CTRL_PKT | \ L2INPUT_FEAT_L2PT | \ L2INPUT_FEAT_IGMP_SNOOP | \ L2INPUT_FEAT_MLD_SNOOP | \ L2INPUT_FEAT_DHCP_SNOOP | \ L2INPUT_FEAT_CFM | \ L2INPUT_FEAT_DAI) // Get a pointer to the config for the given interface l2_input_config_t * l2input_intf_config (u32 sw_if_index); // Enable (or disable) the feature in the bitmap for the given interface u32 l2input_intf_bitmap_enable (u32 sw_if_index, u32 feature_bitmap, u32 enable); #define MODE_L3 0 #define MODE_L2_BRIDGE 1 #define MODE_L2_XC 2 #define MODE_L2_CLASSIFY 3 #define MODE_ERROR_ETH 1 #define MODE_ERROR_BVI_DEF 2 u32 set_int_l2_mode (vlib_main_t * vm, vnet_main_t * vnet_main, u32 mode, u32 sw_if_index, u32 bd_index, u32 bvi, u32 shg, u32 xc_sw_if_index); static inline void vnet_update_l2_len (vlib_buffer_t * b) { ethernet_header_t * eth; u16 ethertype; /* point at currrent l2 hdr */ eth = vlib_buffer_get_current (b); /* * l2-output pays no attention to this * but the tag push/pop code on an l2 subif needs it. * * Determine l2 header len, check for up to 2 vlans */ vnet_buffer(b)->l2.l2_len = sizeof(ethernet_header_t); ethertype = clib_net_to_host_u16(eth->type); if ((ethertype == ETHERNET_TYPE_VLAN) || (ethertype == ETHERNET_TYPE_DOT1AD) || (ethertype == ETHERNET_TYPE_VLAN_9100) || (ethertype == ETHERNET_TYPE_VLAN_9200)) { ethernet_vlan_header_t * vlan; vnet_buffer(b)->l2.l2_len += sizeof (*vlan); vlan = (void *) (eth+1); ethertype = clib_net_to_host_u16 (vlan->type); if (ethertype == ETHERNET_TYPE_VLAN) { vnet_buffer(b)->l2.l2_len += sizeof (*vlan); } } } /* * Compute flow hash of an ethernet packet, use 5-tuple hash if L3 packet * is ip4 or ip6. Otherwise hash on smac/dmac/etype. * The vlib buffer current pointer is expected to be at ethernet header * and vnet l2.l2_len is exppected to be setup already. */ static inline u32 vnet_l2_compute_flow_hash (vlib_buffer_t *b) { ethernet_header_t * eh = vlib_buffer_get_current(b); u8 * l3h = (u8 *)eh + vnet_buffer(b)->l2.l2_len; u16 ethertype = clib_net_to_host_u16(*(u16 *)(l3h - 2)); if (ethertype == ETHERNET_TYPE_IP4) return ip4_compute_flow_hash((ip4_header_t *) l3h, IP_FLOW_HASH_DEFAULT); else if (ethertype == ETHERNET_TYPE_IP6) return ip6_compute_flow_hash((ip6_header_t *) l3h, IP_FLOW_HASH_DEFAULT); else { u32 a, b, c; u32 * ap = (u32 *) &eh->dst_address[2]; u32 * bp = (u32 *) &eh->src_address[2]; a = * ap; b = * bp; c = ethertype; hash_v3_mix32 (a, b, c); hash_v3_finalize32 (a, b, c); return c; } } #endif