2 * Copyright (c) 2018 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 #include <plugins/gbp/gbp.h>
17 #include <plugins/gbp/gbp_policy_dpo.h>
19 #include <vnet/vxlan-gbp/vxlan_gbp_packet.h>
20 #include <vnet/vxlan-gbp/vxlan_gbp.h>
22 #define foreach_gbp_policy \
24 _(REFLECTION, "reflection")
28 #define _(sym,str) GBP_ERROR_##sym,
34 static char *gbp_policy_error_strings[] = {
35 #define _(sym,string) string,
47 * per-packet trace data
49 typedef struct gbp_policy_trace_t_
51 /* per-pkt trace data */
59 always_inline dpo_proto_t
60 ethertype_to_dpo_proto (u16 etype)
62 etype = clib_net_to_host_u16 (etype);
66 case ETHERNET_TYPE_IP4:
67 return (DPO_PROTO_IP4);
68 case ETHERNET_TYPE_IP6:
69 return (DPO_PROTO_IP6);
72 return (DPO_PROTO_NONE);
76 gbp_rule_l2_redirect (const gbp_rule_t * gu, vlib_buffer_t * b0)
78 const ethernet_header_t *eth0;
82 eth0 = vlib_buffer_get_current (b0);
83 /* pop the ethernet header to prepare for L3 rewrite */
84 vlib_buffer_advance (b0, vnet_buffer (b0)->l2.l2_len);
86 dproto = ethertype_to_dpo_proto (eth0->type);
87 dpo = &gu->gu_dpo[GBP_POLICY_NODE_L2][dproto];
89 /* save the LB index for the next node and reset the IP flow hash
90 * so it's recalculated */
91 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo->dpoi_index;
92 vnet_buffer (b0)->ip.flow_hash = 0;
94 return (dpo->dpoi_next_node);
98 gbp_policy_is_ethertype_allowed (const gbp_contract_t * gc0, u16 ethertype)
102 vec_foreach (et, gc0->gc_allowed_ethertypes)
104 if (*et == ethertype)
111 gbp_policy_inline (vlib_main_t * vm,
112 vlib_node_runtime_t * node,
113 vlib_frame_t * frame, u8 is_port_based)
115 gbp_main_t *gm = &gbp_main;
116 gbp_policy_main_t *gpm = &gbp_policy_main;
117 u32 n_left_from, *from, *to_next;
121 n_left_from = frame->n_vectors;
122 from = vlib_frame_vector_args (frame);
124 while (n_left_from > 0)
128 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
130 while (n_left_from > 0 && n_left_to_next > 0)
132 const ethernet_header_t *h0;
133 const gbp_endpoint_t *ge0;
134 const gbp_contract_t *gc0;
135 gbp_policy_next_t next0;
136 gbp_contract_key_t key0;
137 u32 bi0, sw_if_index0;
142 next0 = GBP_POLICY_NEXT_DROP;
150 b0 = vlib_get_buffer (vm, bi0);
151 h0 = vlib_buffer_get_current (b0);
152 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
155 * Reflection check; in and out on an ivxlan tunnel
157 if ((~0 != vxlan_gbp_tunnel_by_sw_if_index (sw_if_index0)) &&
158 (vnet_buffer2 (b0)->gbp.flags & VXLAN_GBP_GPFLAGS_R))
164 * If the A-bit is set then policy has already been applied
165 * and we skip enforcement here.
167 if (vnet_buffer2 (b0)->gbp.flags & VXLAN_GBP_GPFLAGS_A)
169 next0 = vnet_l2_feature_next (b0,
170 gpm->l2_output_feat_next
173 L2OUTPUT_FEAT_GBP_POLICY_PORT :
174 L2OUTPUT_FEAT_GBP_POLICY_MAC));
180 * determine the src and dst EPG
183 ge0 = gbp_endpoint_find_itf (sw_if_index0);
185 ge0 = gbp_endpoint_find_mac (h0->dst_address,
186 vnet_buffer (b0)->l2.bd_index);
189 key0.gck_dst = ge0->ge_fwd.gef_sclass;
191 /* If you cannot determine the destination EP then drop */
194 key0.gck_src = vnet_buffer2 (b0)->gbp.sclass;
196 if (SCLASS_INVALID != key0.gck_src)
198 if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
204 vnet_l2_feature_next (b0,
205 gpm->l2_output_feat_next
208 L2OUTPUT_FEAT_GBP_POLICY_PORT :
209 L2OUTPUT_FEAT_GBP_POLICY_MAC));
210 vnet_buffer2 (b0)->gbp.flags |= VXLAN_GBP_GPFLAGS_A;
214 gci0 = gbp_contract_find (&key0);
216 if (INDEX_INVALID != gci0)
218 u32 rule_match_p0, trace_bitmap0;
219 fa_5tuple_opaque_t pkt_5tuple0;
220 u32 acl_pos_p0, acl_match_p0;
221 u8 is_ip60, l2_len0, action0;
222 const gbp_rule_t *gu;
227 gc0 = gbp_contract_get (gci0);
228 l2_len0 = vnet_buffer (b0)->l2.l2_len;
229 h0 = vlib_buffer_get_current (b0);
231 ether_type0 = *(u16 *) (h0 + l2_len0 - 2);
233 if (!gbp_policy_is_ethertype_allowed (gc0, ether_type0))
236 * black list model so drop
242 clib_net_to_host_u16 (ETHERNET_TYPE_IP6))
244 clib_net_to_host_u16 (ETHERNET_TYPE_IP4)))
248 clib_net_to_host_u16 (ETHERNET_TYPE_IP6)) ? 1 :
251 * tests against the ACL
253 acl_plugin_fill_5tuple_inline (gm->
254 acl_plugin.p_acl_main,
255 gc0->gc_lc_index, b0,
260 acl_plugin_match_5tuple_inline (gm->
261 acl_plugin.p_acl_main,
272 vnet_buffer2 (b0)->gbp.flags |=
275 gbp_rule_get (gc0->gc_rules[rule_match_p0]);
277 switch (gu->gu_action)
279 case GBP_RULE_PERMIT:
280 next0 = vnet_l2_feature_next
282 gpm->l2_output_feat_next
285 L2OUTPUT_FEAT_GBP_POLICY_PORT :
286 L2OUTPUT_FEAT_GBP_POLICY_MAC));
291 case GBP_RULE_REDIRECT:
292 next0 = gbp_rule_l2_redirect (gu, b0);
303 * the src EPG is not set when the packet arrives on an EPG
304 * uplink interface and we do not need to apply policy
307 vnet_l2_feature_next (b0,
308 gpm->l2_output_feat_next[is_port_based],
310 L2OUTPUT_FEAT_GBP_POLICY_PORT :
311 L2OUTPUT_FEAT_GBP_POLICY_MAC));
315 if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
317 gbp_policy_trace_t *t =
318 vlib_add_trace (vm, node, b0, sizeof (*t));
319 t->sclass = key0.gck_src;
320 t->dst_epg = key0.gck_dst;
321 t->acl_index = (gc0 ? gc0->gc_acl_index : ~0);
322 t->allowed = (next0 != GBP_POLICY_NEXT_DROP);
323 t->flags = vnet_buffer2 (b0)->gbp.flags;
326 /* verify speculative enqueue, maybe switch current next frame */
327 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
328 to_next, n_left_to_next,
332 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
335 return frame->n_vectors;
338 VLIB_NODE_FN (gbp_policy_port_node) (vlib_main_t * vm,
339 vlib_node_runtime_t * node,
340 vlib_frame_t * frame)
342 return (gbp_policy_inline (vm, node, frame, 1));
345 VLIB_NODE_FN (gbp_policy_mac_node) (vlib_main_t * vm,
346 vlib_node_runtime_t * node,
347 vlib_frame_t * frame)
349 return (gbp_policy_inline (vm, node, frame, 0));
352 /* packet trace format function */
354 format_gbp_policy_trace (u8 * s, va_list * args)
356 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
357 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
358 gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *);
361 format (s, "sclass:%d, dst:%d, acl:%d allowed:%d flags:%U",
362 t->sclass, t->dst_epg, t->acl_index, t->allowed,
363 format_vxlan_gbp_header_gpflags, t->flags);
369 VLIB_REGISTER_NODE (gbp_policy_port_node) = {
370 .name = "gbp-policy-port",
371 .vector_size = sizeof (u32),
372 .format_trace = format_gbp_policy_trace,
373 .type = VLIB_NODE_TYPE_INTERNAL,
375 .n_errors = ARRAY_LEN(gbp_policy_error_strings),
376 .error_strings = gbp_policy_error_strings,
378 .n_next_nodes = GBP_POLICY_N_NEXT,
381 [GBP_POLICY_NEXT_DROP] = "error-drop",
385 VLIB_REGISTER_NODE (gbp_policy_mac_node) = {
386 .name = "gbp-policy-mac",
387 .vector_size = sizeof (u32),
388 .format_trace = format_gbp_policy_trace,
389 .type = VLIB_NODE_TYPE_INTERNAL,
390 .sibling_of = "gbp-policy-port",
396 * fd.io coding-style-patch-verification: ON
399 * eval: (c-set-style "gnu")