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Diffstat (limited to 'src/plugins/gbp/gbp_policy.c')
| -rw-r--r-- | src/plugins/gbp/gbp_policy.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/src/plugins/gbp/gbp_policy.c b/src/plugins/gbp/gbp_policy.c new file mode 100644 index 00000000000..8f3fc76a019 --- /dev/null +++ b/src/plugins/gbp/gbp_policy.c @@ -0,0 +1,231 @@ +/* + * 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: + */ |