2 * l2_vtr.h : layer 2 vlan tag rewrite processing
4 * Copyright (c) 2013 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #ifndef included_vnet_l2_vtr_h
19 #define included_vnet_l2_vtr_h
21 #include <vlib/vlib.h>
22 #include <vnet/vnet.h>
23 #include <vnet/ethernet/packet.h>
24 #include <vnet/l2/l2_vtr.h>
26 /* VTR config options for API and CLI support */
41 * Per-interface vlan tag rewrite configuration
42 * There will be one instance of this struct for each sw_if_index
43 * for both input vtr and output vtr
50 * Up to two vlan tags to push.
51 * if there is only one vlan tag to push, it is in tags[1].
53 ethernet_vlan_header_tv_t tags[2];
61 u8 push_bytes; /* number of bytes to push for up to 2 vlans (0,4,8) */
62 u8 pop_bytes; /* number of bytes to pop for up to 2 vlans (0,4,8) */
64 u16 push_and_pop_bytes; /* if 0 then the feature is disabled */
70 * Perform the configured tag rewrite on the packet.
71 * Return 0 if ok, 1 if packet should be dropped (e.g. tried to pop
75 l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config)
81 eth = vlib_buffer_get_current (b0);
83 /* copy the 12B dmac and smac to a temporary location */
84 temp_8 = *((u64 *) eth);
85 temp_4 = *((u32 *) (eth + 8));
87 /* adjust for popped tags */
88 eth += config->pop_bytes;
90 /* if not enough tags to pop then drop packet */
91 if (PREDICT_FALSE ((vnet_buffer (b0)->l2.l2_len - 12) < config->pop_bytes))
96 /* copy the 2 new tags to the start of the packet */
97 *((u64 *) (eth + 12 - 8)) = config->raw_tags;
99 /* TODO: set cos bits */
101 /* adjust for pushed tags: */
102 eth -= config->push_bytes;
104 /* copy the 12 dmac and smac back to the packet */
105 *((u64 *) eth) = temp_8;
106 *((u32 *) (eth + 8)) = temp_4;
108 /* Update l2 parameters */
109 vnet_buffer (b0)->l2.l2_len +=
110 (word) config->push_bytes - (word) config->pop_bytes;
111 vnet_buffer (b0)->l2_hdr_offset -=
112 (word) config->push_bytes - (word) config->pop_bytes;
114 /* Update vlan tag count */
115 ethernet_buffer_adjust_vlan_count_by_bytes (b0,
116 (word) config->push_bytes -
117 (word) config->pop_bytes);
119 /* Update packet len */
120 vlib_buffer_advance (b0,
121 (word) config->pop_bytes - (word) config->push_bytes);
128 * Perform the egress pre-vlan tag rewrite EFP Filter check.
129 * The post-vlan tag rewrite check is a separate graph node.
131 * This check insures that a packet being output to an interface
132 * (before output vtr is performed) has vlan tags that match those
133 * on a packet received from that interface (after vtr has been performed).
134 * This means verifying that any tags pushed by input vtr are present
137 * Return 0 if ok, 1 if packet should be dropped.
138 * This function should be passed the input vtr config for the interface.
141 l2_efp_filter_process (vlib_buffer_t * b0, vtr_config_t * in_config)
147 eth = vlib_buffer_get_current (b0);
150 * If there are 2 tags pushed, they must match config->tags[0] and
152 * If there is one tag pushed, it must match config->tag[1].
153 * If there are 0 tags pushed, the check passes.
156 /* mask for two vlan id and ethertypes, no cos bits */
157 tag_mask = clib_net_to_host_u64 (0xFFFF0FFFFFFF0FFF);
158 /* mask for one vlan id and ethertype, no cos bits */
160 (in_config->push_bytes ==
161 4) ? clib_net_to_host_u64 (0xFFFF0FFF) : tag_mask;
162 /* mask for always match */
163 tag_mask = (in_config->push_bytes == 0) ? 0 : tag_mask;
166 * Read 8B from the packet, getting the proper set of vlan tags
167 * For 0 push bytes, the address doesn't matter since the mask
168 * clears the data to 0.
170 packet_tags = *((u64 *) (eth + 4 + in_config->push_bytes));
172 /* Check if the packet tags match the configured tags */
173 return (packet_tags & tag_mask) != in_config->raw_tags;
180 ethernet_pbb_header_t macs_tags;
193 u8 push_bytes; /* number of bytes to push pbb tags */
194 u8 pop_bytes; /* number of bytes to pop pbb tags */
196 u16 push_and_pop_bytes; /* if 0 then the feature is disabled */
201 l2_pbb_process (vlib_buffer_t * b0, ptr_config_t * config)
203 u8 *eth = vlib_buffer_get_current (b0);
205 if (config->pop_bytes > 0)
207 ethernet_pbb_header_packed_t *ph = (ethernet_pbb_header_packed_t *) eth;
209 // drop packet without PBB header or with wrong I-tag or B-tag
210 if (clib_net_to_host_u16 (ph->priority_dei_id) !=
211 clib_net_to_host_u16 (config->macs_tags.priority_dei_id)
212 || clib_net_to_host_u32 (ph->priority_dei_uca_res_sid) !=
213 clib_net_to_host_u32 (config->macs_tags.priority_dei_uca_res_sid))
216 eth += config->pop_bytes;
219 if (config->push_bytes > 0)
221 eth -= config->push_bytes;
222 // copy the B-DA (6B), B-SA (6B), B-TAG (4B), I-TAG (6B)
223 *((u64 *) eth) = config->raw_data.data1;
224 *((u64 *) (eth + 8)) = config->raw_data.data2;
225 *((u16 *) (eth + 16)) = config->raw_data.data3;
226 *((u32 *) (eth + 18)) = config->raw_data.data4;
230 vnet_buffer (b0)->l2.l2_len +=
231 (word) config->push_bytes - (word) config->pop_bytes;
232 /* Update packet len */
233 vlib_buffer_advance (b0,
234 (word) config->pop_bytes - (word) config->push_bytes);
239 u32 l2pbb_configure (vlib_main_t * vlib_main,
240 vnet_main_t * vnet_main, u32 sw_if_index, u32 vtr_op,
241 u8 * b_dmac, u8 * b_smac,
242 u16 b_vlanid, u32 i_sid, u16 vlan_outer_tag);
245 * Configure vtag tag rewrite on the given interface.
246 * Return 1 if there is an error, 0 if ok
248 u32 l2vtr_configure (vlib_main_t * vlib_main,
249 vnet_main_t * vnet_main,
251 u32 vtr_op, u32 push_dot1q, u32 vtr_tag1, u32 vtr_tag2);
254 * Get vtag tag rewrite on the given interface.
255 * Return 1 if there is an error, 0 if ok
257 u32 l2vtr_get (vlib_main_t * vlib_main,
258 vnet_main_t * vnet_main,
261 u32 * push_dot1q, u32 * vtr_tag1, u32 * vtr_tag2);
264 * Get pbb tag rewrite on the given interface.
265 * Return 1 if there is an error, 0 if ok
267 u32 l2pbb_get (vlib_main_t * vlib_main,
268 vnet_main_t * vnet_main,
272 ethernet_header_t * eth_hdr, u16 * b_vlanid, u32 * i_sid);
274 #endif /* included_vnet_l2_vtr_h */
278 * fd.io coding-style-patch-verification: ON
281 * eval: (c-set-style "gnu")