/* * Copyright (c) 2018 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. */ #include <plugins/gbp/gbp.h> /** * Grouping of global data for the GBP source EPG classification feature */ typedef struct gbp_policy_main_t_ { /** * Next nodes for L2 output features */ u32 l2_output_feat_next[32]; } gbp_policy_main_t; static gbp_policy_main_t gbp_policy_main; #define foreach_gbp_policy \ _(DENY, "deny") typedef enum { #define _(sym,str) GBP_ERROR_##sym, foreach_gbp_policy #undef _ GBP_POLICY_N_ERROR, } gbp_policy_error_t; static char *gbp_policy_error_strings[] = { #define _(sym,string) string, foreach_gbp_policy #undef _ }; typedef enum { #define _(sym,str) GBP_POLICY_NEXT_##sym, foreach_gbp_policy #undef _ GBP_POLICY_N_NEXT, } gbp_policy_next_t; /** * per-packet trace data */ typedef struct gbp_policy_trace_t_ { /* per-pkt trace data */ epg_id_t src_epg; epg_id_t dst_epg; u32 acl_index; } gbp_policy_trace_t; static uword gbp_policy (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { gbp_policy_main_t *gpm = &gbp_policy_main; u32 n_left_from, *from, *to_next; u32 next_index; next_index = 0; n_left_from = frame->n_vectors; from = vlib_frame_vector_args (frame); while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { gbp_policy_next_t next0; gbp_contract_key_t key0; u32 bi0, sw_if_index0; vlib_buffer_t *b0; u32 acl_index0; next0 = GBP_POLICY_NEXT_DENY; bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); /* * determine the src and dst EPG */ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; key0.gck_dst = gbp_port_to_epg (sw_if_index0); key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg; acl_index0 = ~0; if (~0 != key0.gck_src) { if (PREDICT_FALSE (key0.gck_src == key0.gck_dst)) { /* * intra-epg allowed */ next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next, L2OUTPUT_FEAT_GBP_POLICY); } else { acl_index0 = gbp_acl_lookup (&key0); if (~0 != acl_index0) { /* * TODO tests against the ACL */ /* * ACL tables are not available outside of ACL plugin * until then bypass the ACL to next node */ next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next, L2OUTPUT_FEAT_GBP_POLICY); } } } else { /* * the src EPG is not set when the packet arrives on an EPG * uplink interface and we do not need to apply policy */ next0 = vnet_l2_feature_next (b0, gpm->l2_output_feat_next, L2OUTPUT_FEAT_GBP_POLICY); } if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED))) { gbp_policy_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->src_epg = key0.gck_src; t->dst_epg = key0.gck_dst; t->acl_index = acl_index0; } /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return frame->n_vectors; } /* packet trace format function */ static u8 * format_gbp_policy_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *); s = format (s, "src:%d, dst:%d, acl:%d", t->src_epg, t->dst_epg, t->acl_index); return s; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (gbp_policy_node) = { .function = gbp_policy, .name = "gbp-policy", .vector_size = sizeof (u32), .format_trace = format_gbp_policy_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(gbp_policy_error_strings), .error_strings = gbp_policy_error_strings, .n_next_nodes = GBP_POLICY_N_NEXT, .next_nodes = { [GBP_POLICY_NEXT_DENY] = "error-drop", }, }; VLIB_NODE_FUNCTION_MULTIARCH (gbp_policy_node, gbp_policy); /* *INDENT-ON* */ static clib_error_t * gbp_policy_init (vlib_main_t * vm) { gbp_policy_main_t *gpm = &gbp_policy_main; /* Initialize the feature next-node indexes */ feat_bitmap_init_next_nodes (vm, gbp_policy_node.index, L2OUTPUT_N_FEAT, l2output_get_feat_names (), gpm->l2_output_feat_next); return 0; } VLIB_INIT_FUNCTION (gbp_policy_init); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */