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>
21 #define foreach_gbp_policy \
26 #define _(sym,str) GBP_ERROR_##sym,
32 static char *gbp_policy_error_strings[] = {
33 #define _(sym,string) string,
40 #define _(sym,str) GBP_POLICY_NEXT_##sym,
47 * per-packet trace data
49 typedef struct gbp_policy_trace_t_
51 /* per-pkt trace data */
58 always_inline dpo_proto_t
59 ethertype_to_dpo_proto (u16 etype)
61 etype = clib_net_to_host_u16 (etype);
65 case ETHERNET_TYPE_IP4:
66 return (DPO_PROTO_IP4);
67 case ETHERNET_TYPE_IP6:
68 return (DPO_PROTO_IP6);
71 return (DPO_PROTO_NONE);
75 gbp_rule_l2_redirect (const gbp_rule_t * gu, vlib_buffer_t * b0)
77 const ethernet_header_t *eth0;
81 eth0 = vlib_buffer_get_current (b0);
82 /* pop the ethernet header to prepare for L3 rewrite */
83 vlib_buffer_advance (b0, vnet_buffer (b0)->l2.l2_len);
85 dproto = ethertype_to_dpo_proto (eth0->type);
86 dpo = &gu->gu_dpo[GBP_POLICY_NODE_L2][dproto];
88 /* save the LB index for the next node and reset the IP flow hash
89 * so it's recalculated */
90 vnet_buffer (b0)->ip.adj_index[VLIB_TX] = dpo->dpoi_index;
91 vnet_buffer (b0)->ip.flow_hash = 0;
93 return (dpo->dpoi_next_node);
97 gbp_policy_is_ethertype_allowed (const gbp_contract_t * gc0, u16 ethertype)
101 vec_foreach (et, gc0->gc_allowed_ethertypes)
103 if (*et == ethertype)
110 gbp_policy_inline (vlib_main_t * vm,
111 vlib_node_runtime_t * node,
112 vlib_frame_t * frame, u8 is_port_based)
114 gbp_main_t *gm = &gbp_main;
115 gbp_policy_main_t *gpm = &gbp_policy_main;
116 u32 n_left_from, *from, *to_next;
120 n_left_from = frame->n_vectors;
121 from = vlib_frame_vector_args (frame);
123 while (n_left_from > 0)
127 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
129 while (n_left_from > 0 && n_left_to_next > 0)
131 const ethernet_header_t *h0;
132 const gbp_endpoint_t *ge0;
133 const gbp_contract_t *gc0;
134 gbp_policy_next_t next0;
135 gbp_contract_key_t key0;
136 u32 bi0, sw_if_index0;
141 next0 = GBP_POLICY_NEXT_DENY;
149 b0 = vlib_get_buffer (vm, bi0);
150 h0 = vlib_buffer_get_current (b0);
151 sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX];
154 * If the A0bit is set then policy has already been applied
155 * and we skip enforcement here.
157 if (vnet_buffer2 (b0)->gbp.flags & VXLAN_GBP_GPFLAGS_A)
159 next0 = vnet_l2_feature_next (b0,
160 gpm->l2_output_feat_next
163 L2OUTPUT_FEAT_GBP_POLICY_PORT :
164 L2OUTPUT_FEAT_GBP_POLICY_MAC));
169 * determine the src and dst EPG
172 ge0 = gbp_endpoint_find_itf (sw_if_index0);
174 ge0 = gbp_endpoint_find_mac (h0->dst_address,
175 vnet_buffer (b0)->l2.bd_index);
178 key0.gck_dst = ge0->ge_fwd.gef_epg_id;
180 /* If you cannot determine the destination EP then drop */
183 key0.gck_src = vnet_buffer2 (b0)->gbp.src_epg;
185 if (EPG_INVALID != key0.gck_src)
187 if (PREDICT_FALSE (key0.gck_src == key0.gck_dst))
193 vnet_l2_feature_next (b0,
194 gpm->l2_output_feat_next
197 L2OUTPUT_FEAT_GBP_POLICY_PORT :
198 L2OUTPUT_FEAT_GBP_POLICY_MAC));
199 vnet_buffer2 (b0)->gbp.flags |= VXLAN_GBP_GPFLAGS_A;
203 gci0 = gbp_contract_find (&key0);
205 if (INDEX_INVALID != gci0)
207 u32 rule_match_p0, trace_bitmap0;
208 fa_5tuple_opaque_t pkt_5tuple0;
209 u32 acl_pos_p0, acl_match_p0;
210 u8 is_ip60, l2_len0, action0;
211 const gbp_rule_t *gu;
216 gc0 = gbp_contract_get (gci0);
217 l2_len0 = vnet_buffer (b0)->l2.l2_len;
218 h0 = vlib_buffer_get_current (b0);
220 ether_type0 = *(u16 *) (h0 + l2_len0 - 2);
222 if (!gbp_policy_is_ethertype_allowed (gc0, ether_type0))
225 * black list model so drop
231 clib_net_to_host_u16 (ETHERNET_TYPE_IP6))
233 clib_net_to_host_u16 (ETHERNET_TYPE_IP4)))
237 clib_net_to_host_u16 (ETHERNET_TYPE_IP6)) ? 1 :
240 * tests against the ACL
242 acl_plugin_fill_5tuple_inline (gm->
243 acl_plugin.p_acl_main,
244 gc0->gc_lc_index, b0,
249 acl_plugin_match_5tuple_inline (gm->
250 acl_plugin.p_acl_main,
261 vnet_buffer2 (b0)->gbp.flags |=
264 gbp_rule_get (gc0->gc_rules[rule_match_p0]);
266 switch (gu->gu_action)
268 case GBP_RULE_PERMIT:
269 next0 = vnet_l2_feature_next
271 gpm->l2_output_feat_next
274 L2OUTPUT_FEAT_GBP_POLICY_PORT :
275 L2OUTPUT_FEAT_GBP_POLICY_MAC));
280 case GBP_RULE_REDIRECT:
281 next0 = gbp_rule_l2_redirect (gu, b0);
292 * the src EPG is not set when the packet arrives on an EPG
293 * uplink interface and we do not need to apply policy
296 vnet_l2_feature_next (b0,
297 gpm->l2_output_feat_next[is_port_based],
299 L2OUTPUT_FEAT_GBP_POLICY_PORT :
300 L2OUTPUT_FEAT_GBP_POLICY_MAC));
304 if (PREDICT_FALSE ((b0->flags & VLIB_BUFFER_IS_TRACED)))
306 gbp_policy_trace_t *t =
307 vlib_add_trace (vm, node, b0, sizeof (*t));
308 t->src_epg = key0.gck_src;
309 t->dst_epg = key0.gck_dst;
310 t->acl_index = (gc0 ? gc0->gc_acl_index : ~0),
311 t->allowed = (next0 != GBP_POLICY_NEXT_DENY);
314 /* verify speculative enqueue, maybe switch current next frame */
315 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
316 to_next, n_left_to_next,
320 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
323 return frame->n_vectors;
326 VLIB_NODE_FN (gbp_policy_port_node) (vlib_main_t * vm,
327 vlib_node_runtime_t * node,
328 vlib_frame_t * frame)
330 return (gbp_policy_inline (vm, node, frame, 1));
333 VLIB_NODE_FN (gbp_policy_mac_node) (vlib_main_t * vm,
334 vlib_node_runtime_t * node,
335 vlib_frame_t * frame)
337 return (gbp_policy_inline (vm, node, frame, 0));
340 /* packet trace format function */
342 format_gbp_policy_trace (u8 * s, va_list * args)
344 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
345 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
346 gbp_policy_trace_t *t = va_arg (*args, gbp_policy_trace_t *);
349 format (s, "src:%d, dst:%d, acl:%d allowed:%d",
350 t->src_epg, t->dst_epg, t->acl_index, t->allowed);
356 VLIB_REGISTER_NODE (gbp_policy_port_node) = {
357 .name = "gbp-policy-port",
358 .vector_size = sizeof (u32),
359 .format_trace = format_gbp_policy_trace,
360 .type = VLIB_NODE_TYPE_INTERNAL,
362 .n_errors = ARRAY_LEN(gbp_policy_error_strings),
363 .error_strings = gbp_policy_error_strings,
365 .n_next_nodes = GBP_POLICY_N_NEXT,
368 [GBP_POLICY_NEXT_DENY] = "error-drop",
372 VLIB_REGISTER_NODE (gbp_policy_mac_node) = {
373 .name = "gbp-policy-mac",
374 .vector_size = sizeof (u32),
375 .format_trace = format_gbp_policy_trace,
376 .type = VLIB_NODE_TYPE_INTERNAL,
377 .sibling_of = "gbp-policy-port",
383 * fd.io coding-style-patch-verification: ON
386 * eval: (c-set-style "gnu")