Line data Source code
1 : /*
2 : * l2_vtr.h : layer 2 vlan tag rewrite processing
3 : *
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:
8 : *
9 : * http://www.apache.org/licenses/LICENSE-2.0
10 : *
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.
16 : */
17 :
18 : #ifndef included_vnet_l2_vtr_h
19 : #define included_vnet_l2_vtr_h
20 :
21 : #include <vlib/vlib.h>
22 : #include <vnet/vnet.h>
23 : #include <vnet/ethernet/ethernet.h>
24 : #include <vnet/ethernet/packet.h>
25 : #include <vnet/l2/l2_vtr.h>
26 :
27 : /* VTR config options for API and CLI support */
28 : typedef enum
29 : {
30 : L2_VTR_DISABLED,
31 : L2_VTR_PUSH_1,
32 : L2_VTR_PUSH_2,
33 : L2_VTR_POP_1,
34 : L2_VTR_POP_2,
35 : L2_VTR_TRANSLATE_1_1,
36 : L2_VTR_TRANSLATE_1_2,
37 : L2_VTR_TRANSLATE_2_1,
38 : L2_VTR_TRANSLATE_2_2
39 : } l2_vtr_op_t;
40 :
41 : /**
42 : * Per-interface vlan tag rewrite configuration
43 : * There will be one instance of this struct for each sw_if_index
44 : * for both input vtr and output vtr
45 : */
46 : typedef struct
47 : {
48 : union
49 : {
50 : /*
51 : * Up to two vlan tags to push.
52 : * if there is only one vlan tag to push, it is in tags[1].
53 : */
54 : ethernet_vlan_header_tv_t tags[2];
55 : u64 raw_tags;
56 : };
57 :
58 : union
59 : {
60 : struct
61 : {
62 : u8 push_bytes; /* number of bytes to push for up to 2 vlans (0,4,8) */
63 : u8 pop_bytes; /* number of bytes to pop for up to 2 vlans (0,4,8) */
64 : };
65 : u16 push_and_pop_bytes; /* if 0 then the feature is disabled */
66 : };
67 : } vtr_config_t;
68 :
69 :
70 : /**
71 : * Perform the configured tag rewrite on the packet.
72 : * Return 0 if ok, 1 if packet should be dropped (e.g. tried to pop
73 : * too many tags)
74 : */
75 : always_inline u32
76 2532 : l2_vtr_process (vlib_buffer_t * b0, vtr_config_t * config)
77 : {
78 : u64 temp_8;
79 : u32 temp_4;
80 : u8 *eth;
81 :
82 2532 : eth = vlib_buffer_get_current (b0);
83 :
84 : /* copy the 12B dmac and smac to a temporary location */
85 2532 : temp_8 = *((u64 *) eth);
86 2532 : temp_4 = *((u32 *) (eth + 8));
87 :
88 : /* adjust for popped tags */
89 2532 : eth += config->pop_bytes;
90 :
91 : /* if not enough tags to pop then drop packet */
92 2532 : if (PREDICT_FALSE ((vnet_buffer (b0)->l2.l2_len - 12) < config->pop_bytes))
93 : {
94 0 : return 1;
95 : }
96 :
97 : /* copy the 2 new tags to the start of the packet */
98 2532 : *((u64 *) (eth + 12 - 8)) = config->raw_tags;
99 :
100 : /* TODO: set cos bits */
101 :
102 : /* adjust for pushed tags: */
103 2532 : eth -= config->push_bytes;
104 :
105 : /* copy the 12 dmac and smac back to the packet */
106 2532 : *((u64 *) eth) = temp_8;
107 2532 : *((u32 *) (eth + 8)) = temp_4;
108 :
109 : /* Update l2 parameters */
110 2532 : vnet_buffer (b0)->l2.l2_len +=
111 2532 : (word) config->push_bytes - (word) config->pop_bytes;
112 2532 : vnet_buffer (b0)->l2_hdr_offset -=
113 2532 : (word) config->push_bytes - (word) config->pop_bytes;
114 :
115 : /* Update vlan tag count */
116 2532 : ethernet_buffer_adjust_vlan_count_by_bytes (b0,
117 : (word) config->push_bytes -
118 : (word) config->pop_bytes);
119 :
120 : /* Update packet len */
121 2532 : vlib_buffer_advance (b0,
122 2532 : (word) config->pop_bytes - (word) config->push_bytes);
123 :
124 2532 : return 0;
125 : }
126 :
127 :
128 : /*
129 : * Perform the egress pre-vlan tag rewrite EFP Filter check.
130 : * The post-vlan tag rewrite check is a separate graph node.
131 : *
132 : * This check insures that a packet being output to an interface
133 : * (before output vtr is performed) has vlan tags that match those
134 : * on a packet received from that interface (after vtr has been performed).
135 : * This means verifying that any tags pushed by input vtr are present
136 : * on the packet.
137 : *
138 : * Return 0 if ok, 1 if packet should be dropped.
139 : * This function should be passed the input vtr config for the interface.
140 : */
141 : always_inline u8
142 0 : l2_efp_filter_process (vlib_buffer_t * b0, vtr_config_t * in_config)
143 : {
144 : u8 *eth;
145 : u64 packet_tags;
146 : u64 tag_mask;
147 :
148 0 : eth = vlib_buffer_get_current (b0);
149 :
150 : /*
151 : * If there are 2 tags pushed, they must match config->tags[0] and
152 : * config->tags[1].
153 : * If there is one tag pushed, it must match config->tag[1].
154 : * If there are 0 tags pushed, the check passes.
155 : */
156 :
157 : /* mask for two vlan id and ethertypes, no cos bits */
158 0 : tag_mask = clib_net_to_host_u64 (0xFFFF0FFFFFFF0FFF);
159 : /* mask for one vlan id and ethertype, no cos bits */
160 0 : tag_mask =
161 0 : (in_config->push_bytes ==
162 0 : 4) ? clib_net_to_host_u64 (0xFFFF0FFF) : tag_mask;
163 : /* mask for always match */
164 0 : tag_mask = (in_config->push_bytes == 0) ? 0 : tag_mask;
165 :
166 : /*
167 : * Read 8B from the packet, getting the proper set of vlan tags
168 : * For 0 push bytes, the address doesn't matter since the mask
169 : * clears the data to 0.
170 : */
171 0 : packet_tags = *((u64 *) (eth + 4 + in_config->push_bytes));
172 :
173 : /* Check if the packet tags match the configured tags */
174 0 : return (packet_tags & tag_mask) != in_config->raw_tags;
175 : }
176 :
177 : typedef struct
178 : {
179 : union
180 : {
181 : ethernet_pbb_header_t macs_tags;
182 : struct
183 : {
184 : u64 data1;
185 : u64 data2;
186 : u16 data3;
187 : u32 data4;
188 : } raw_data;
189 : };
190 : union
191 : {
192 : struct
193 : {
194 : u8 push_bytes; /* number of bytes to push pbb tags */
195 : u8 pop_bytes; /* number of bytes to pop pbb tags */
196 : };
197 : u16 push_and_pop_bytes; /* if 0 then the feature is disabled */
198 : };
199 : } ptr_config_t;
200 :
201 : always_inline u32
202 0 : l2_pbb_process (vlib_buffer_t * b0, ptr_config_t * config)
203 : {
204 0 : u8 *eth = vlib_buffer_get_current (b0);
205 :
206 0 : if (config->pop_bytes > 0)
207 : {
208 0 : ethernet_pbb_header_packed_t *ph = (ethernet_pbb_header_packed_t *) eth;
209 :
210 : // drop packet without PBB header or with wrong I-tag or B-tag
211 0 : if (clib_net_to_host_u16 (ph->priority_dei_id) !=
212 0 : clib_net_to_host_u16 (config->macs_tags.priority_dei_id)
213 0 : || clib_net_to_host_u32 (ph->priority_dei_uca_res_sid) !=
214 0 : clib_net_to_host_u32 (config->macs_tags.priority_dei_uca_res_sid))
215 0 : return 1;
216 :
217 0 : eth += config->pop_bytes;
218 : }
219 :
220 0 : if (config->push_bytes > 0)
221 : {
222 0 : eth -= config->push_bytes;
223 : // copy the B-DA (6B), B-SA (6B), B-TAG (4B), I-TAG (6B)
224 0 : *((u64 *) eth) = config->raw_data.data1;
225 0 : *((u64 *) (eth + 8)) = config->raw_data.data2;
226 0 : *((u16 *) (eth + 16)) = config->raw_data.data3;
227 0 : *((u32 *) (eth + 18)) = config->raw_data.data4;
228 : }
229 :
230 : /* Update l2_len */
231 0 : vnet_buffer (b0)->l2.l2_len +=
232 0 : (word) config->push_bytes - (word) config->pop_bytes;
233 : /* Update packet len */
234 0 : vlib_buffer_advance (b0,
235 0 : (word) config->pop_bytes - (word) config->push_bytes);
236 :
237 0 : return 0;
238 : }
239 :
240 : u32 l2pbb_configure (vlib_main_t * vlib_main,
241 : vnet_main_t * vnet_main, u32 sw_if_index, u32 vtr_op,
242 : u8 * b_dmac, u8 * b_smac,
243 : u16 b_vlanid, u32 i_sid, u16 vlan_outer_tag);
244 :
245 : /**
246 : * Configure vtag tag rewrite on the given interface.
247 : * Return 1 if there is an error, 0 if ok
248 : */
249 : u32 l2vtr_configure (vlib_main_t * vlib_main,
250 : vnet_main_t * vnet_main,
251 : u32 sw_if_index,
252 : u32 vtr_op, u32 push_dot1q, u32 vtr_tag1, u32 vtr_tag2);
253 :
254 : /**
255 : * Get vtag tag rewrite on the given interface.
256 : * Return 1 if there is an error, 0 if ok
257 : */
258 : u32 l2vtr_get (vlib_main_t * vlib_main,
259 : vnet_main_t * vnet_main,
260 : u32 sw_if_index,
261 : u32 * vtr_op,
262 : u32 * push_dot1q, u32 * vtr_tag1, u32 * vtr_tag2);
263 :
264 : /**
265 : * Get pbb tag rewrite on the given interface.
266 : * Return 1 if there is an error, 0 if ok
267 : */
268 : u32 l2pbb_get (vlib_main_t * vlib_main,
269 : vnet_main_t * vnet_main,
270 : u32 sw_if_index,
271 : u32 * vtr_op,
272 : u16 * outer_tag,
273 : ethernet_header_t * eth_hdr, u16 * b_vlanid, u32 * i_sid);
274 :
275 : #endif /* included_vnet_l2_vtr_h */
276 :
277 :
278 : /*
279 : * fd.io coding-style-patch-verification: ON
280 : *
281 : * Local Variables:
282 : * eval: (c-set-style "gnu")
283 : * End:
284 : */
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