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Diffstat (limited to 'src/vnet/l2/l2_input.h')
| -rw-r--r-- | src/vnet/l2/l2_input.h | 289 |
1 files changed, 289 insertions, 0 deletions
diff --git a/src/vnet/l2/l2_input.h b/src/vnet/l2/l2_input.h new file mode 100644 index 00000000..e8a6c776 --- /dev/null +++ b/src/vnet/l2/l2_input.h @@ -0,0 +1,289 @@ +/* + * 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 <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/l2/l2_bd.h> +#include <vnet/ethernet/packet.h> +#include <vnet/ip/ip.h> + +/* 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_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_TERM, "arp-term-l2bd") \ + _(UU_FLOOD, "l2-flood") \ + _(FWD, "l2-fwd") \ + _(RW, "l2-rw") \ + _(LEARN, "l2-learn") \ + _(VTR, "l2-input-vtr") \ + _(VPATH, "vpath-input-l2") \ + _(ACL, "l2-input-acl") \ + _(POLICER_CLAS, "l2-policer-classify") \ + _(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 +{ +#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 */ +u8 *format_l2_input_features (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); +} + +/** 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, + u32 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); + + +#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; + u8 vlan_count = 0; + + /* 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 (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 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 + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |