hicn - Hybrid Information-Centric Networking

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/* * 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 <stdbool.h> #include <vlib/vlib.h> #include <vnet/vnet.h> #include <vnet/l2/l2_bd.h> #include <vnet/ethernet/ethernet.h> #include <vnet/ethernet/packet.h> #include <vnet/ip/ip4_inlines.h> #include <vnet/ip/ip6_inlines.h> /* l2 connection type */ typedef enum l2_input_flags_t_ { /* NONE imples L3 mode. */ L2_INPUT_FLAG_NONE = 0, L2_INPUT_FLAG_XCONNECT = (1 << 0), L2_INPUT_FLAG_BRIDGE = (1 << 1), L2_INPUT_FLAG_BVI = (1 << 2), } __clib_packed l2_input_flags_t; /* Per-subinterface L2 feature configuration */ typedef struct { u8 __force_u64_alignement[0] __attribute__ ((aligned (8))); union { /* bridge domain id and values cached from the BD */ struct { u16 bd_index; u8 bd_seq_num; u8 bd_mac_age; }; /* for xconnect */ u32 output_sw_if_index; }; /* config for which input features are configured on this interface */ u32 feature_bitmap; /* config for which input features are configured on this interface's * BD - this is cahced from the BD struct*/ u32 bd_feature_bitmap; /* split horizon group */ u8 shg; /* Interface sequence number */ u8 seq_num; /* Flags describing this interface */ l2_input_flags_t flags; /* A wee bit of spare space */ u8 __pad; } l2_input_config_t; /* Ensure a struct is an even multiple of 8 bytes, * so they do not stradle cache lines */ STATIC_ASSERT_SIZEOF (l2_input_config_t, 2 * sizeof (u64)); 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_index */ 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; extern vlib_node_registration_t l2input_node; 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; } static_always_inline l2_bridge_domain_t * l2input_bd_config (u32 bd_index) { l2input_main_t *mp = &l2input_main; l2_bridge_domain_t *bd_config; vec_validate (mp->bd_configs, bd_index); bd_config = vec_elt_at_index (mp->bd_configs, bd_index); return bd_config; } /* L2 input indication packet is from BVI, using -2 */ #define L2INPUT_BVI ((u32) (~0-1)) /* L2 input features */ /* Mappings from feature ID to graph node name in reverse order */ #define foreach_l2input_feat \ _(DROP, "feature-bitmap-drop") \ _(XCONNECT, "l2-output") \ _(FLOOD, "l2-flood") \ _(ARP_UFWD, "l2-uu-fwd") \ _(ARP_TERM, "arp-term-l2bd") \ _(UU_FLOOD, "l2-flood") \ _(GBP_FWD, "gbp-fwd") \ _(UU_FWD, "l2-uu-fwd") \ _(FWD, "l2-fwd") \ _(RW, "l2-rw") \ _(LEARN, "l2-learn") \ _(L2_EMULATION, "l2-emulation") \ _(GBP_LEARN, "gbp-learn-l2") \ _(GBP_LPM_ANON_CLASSIFY, "l2-gbp-lpm-anon-classify") \ _(GBP_NULL_CLASSIFY, "gbp-null-classify") \ _(GBP_SRC_CLASSIFY, "gbp-src-classify") \ _(GBP_LPM_CLASSIFY, "l2-gbp-lpm-classify") \ _(VTR, "l2-input-vtr") \ _(L2_IP_QOS_RECORD, "l2-ip-qos-record") \ _(VPATH, "vpath-input-l2") \ _(ACL, "l2-input-acl") \ _(POLICER_CLAS, "l2-policer-classify") \ _(INPUT_FEAT_ARC, "l2-input-feat-arc") \ _(INPUT_CLASSIFY, "l2-input-classify") \ _(SPAN, "span-l2-input") /* Feature bitmap positions */ typedef enum { #define _(sym,str) L2INPUT_FEAT_##sym##_BIT, foreach_l2input_feat #undef _ L2INPUT_N_FEAT } l2input_feat_t; STATIC_ASSERT (L2INPUT_N_FEAT <= 32, "too many l2 input features"); /* Feature bit masks */ typedef enum { L2INPUT_FEAT_NONE = 0, #define _(sym,str) L2INPUT_FEAT_##sym = (1<<L2INPUT_FEAT_##sym##_BIT), foreach_l2input_feat #undef _ L2INPUT_VALID_MASK = #define _(sym,str) L2INPUT_FEAT_##sym | foreach_l2input_feat #undef _ 0 } l2input_feat_masks_t; STATIC_ASSERT ((u64) L2INPUT_VALID_MASK == (1ull << L2INPUT_N_FEAT) - 1, ""); /** Return an array of strings containing graph node names of each feature */ char **l2input_get_feat_names (void); /* arg0 - u32 feature_bitmap, arg1 - u32 verbose */ u8 *format_l2_input_feature_bitmap (u8 * s, va_list * args); u8 *format_l2_input_features (u8 * s, va_list * args); u8 *format_l2_input (u8 * s, va_list * args); static_always_inline u8 bd_feature_flood (l2_bridge_domain_t * bd_config) { return ((bd_config->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); } static_always_inline u8 bd_feature_arp_ufwd (l2_bridge_domain_t * bd_config) { return ((bd_config->feature_bitmap & L2INPUT_FEAT_ARP_UFWD) == L2INPUT_FEAT_ARP_UFWD); } static inline bool l2_input_is_bridge (const l2_input_config_t * input) { return (input->flags & L2_INPUT_FLAG_BRIDGE); } static inline bool l2_input_is_xconnect (const l2_input_config_t * input) { return (input->flags & L2_INPUT_FLAG_XCONNECT); } static inline bool l2_input_is_bvi (const l2_input_config_t * input) { return (input->flags & L2_INPUT_FLAG_BVI); } static_always_inline u8 l2_input_seq_num (u32 sw_if_index) { l2_input_config_t *input; input = vec_elt_at_index (l2input_main.configs, sw_if_index); return input->seq_num; } /** Masks for eliminating features that do not apply to a packet */ /** 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, l2input_feat_masks_t feature_bitmap, u32 enable); /* Sets modifies flags from a bridge domain */ u32 l2input_set_bridge_features (u32 bd_index, u32 feat_mask, u32 feat_value); void l2input_interface_mac_change (u32 sw_if_index, const u8 * old_address, const u8 * new_address); void l2_input_seq_num_inc (u32 sw_if_index); walk_rc_t l2input_recache (u32 bd_index, u32 sw_if_index); #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, l2_bd_port_type_t port_type, u32 shg, u32 xc_sw_if_index); static inline void vnet_update_l2_len (vlib_buffer_t * b) { ethernet_header_t *eth; u16 ethertype; u8 vlan_count = 0; /* point at current 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 (ethernet_frame_is_tagged (ethertype)) { ethernet_vlan_header_t *vlan; vnet_buffer (b)->l2.l2_len += sizeof (*vlan); vlan_count = 1; 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); vlan_count = 2; } } ethernet_buffer_set_vlan_count (b, vlan_count); } /* * 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 expected 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 /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */


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