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Vector Packet Processing
l2_vtr.h
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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/packet.h>
24 #include <vnet/l2/l2_vtr.h>
25 
26 /* VTR config options for API and CLI support */
27 typedef enum
28 {
38 } l2_vtr_op_t;
39 
40 /**
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
44  */
45 typedef struct
46 {
47  union
48  {
49  /*
50  * Up to two vlan tags to push.
51  * if there is only one vlan tag to push, it is in tags[1].
52  */
55  };
56 
57  union
58  {
59  struct
60  {
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) */
63  };
64  u16 push_and_pop_bytes; /* if 0 then the feature is disabled */
65  };
66 } vtr_config_t;
67 
68 
69 /**
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
72  * too many tags)
73  */
76 {
77  u64 temp_8;
78  u32 temp_4;
79  u8 *eth;
80 
81  eth = vlib_buffer_get_current (b0);
82 
83  /* copy the 12B dmac and smac to a temporary location */
84  temp_8 = *((u64 *) eth);
85  temp_4 = *((u32 *) (eth + 8));
86 
87  /* adjust for popped tags */
88  eth += config->pop_bytes;
89 
90  /* if not enough tags to pop then drop packet */
91  if (PREDICT_FALSE ((vnet_buffer (b0)->l2.l2_len - 12) < config->pop_bytes))
92  {
93  return 1;
94  }
95 
96  /* copy the 2 new tags to the start of the packet */
97  *((u64 *) (eth + 12 - 8)) = config->raw_tags;
98 
99  /* TODO: set cos bits */
100 
101  /* adjust for pushed tags: */
102  eth -= config->push_bytes;
103 
104  /* copy the 12 dmac and smac back to the packet */
105  *((u64 *) eth) = temp_8;
106  *((u32 *) (eth + 8)) = temp_4;
107 
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;
113 
114  /* Update vlan tag count */
116  (word) config->push_bytes -
117  (word) config->pop_bytes);
118 
119  /* Update packet len */
121  (word) config->pop_bytes - (word) config->push_bytes);
122 
123  return 0;
124 }
125 
126 
127 /*
128  * Perform the egress pre-vlan tag rewrite EFP Filter check.
129  * The post-vlan tag rewrite check is a separate graph node.
130  *
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
135  * on the packet.
136  *
137  * Return 0 if ok, 1 if packet should be dropped.
138  * This function should be passed the input vtr config for the interface.
139  */
142 {
143  u8 *eth;
144  u64 packet_tags;
145  u64 tag_mask;
146 
147  eth = vlib_buffer_get_current (b0);
148 
149  /*
150  * If there are 2 tags pushed, they must match config->tags[0] and
151  * config->tags[1].
152  * If there is one tag pushed, it must match config->tag[1].
153  * If there are 0 tags pushed, the check passes.
154  */
155 
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 */
159  tag_mask =
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;
164 
165  /*
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.
169  */
170  packet_tags = *((u64 *) (eth + 4 + in_config->push_bytes));
171 
172  /* Check if the packet tags match the configured tags */
173  return (packet_tags & tag_mask) != in_config->raw_tags;
174 }
175 
176 typedef struct
177 {
178  union
179  {
181  struct
182  {
187  } raw_data;
188  };
189  union
190  {
191  struct
192  {
193  u8 push_bytes; /* number of bytes to push pbb tags */
194  u8 pop_bytes; /* number of bytes to pop pbb tags */
195  };
196  u16 push_and_pop_bytes; /* if 0 then the feature is disabled */
197  };
198 } ptr_config_t;
199 
202 {
203  u8 *eth = vlib_buffer_get_current (b0);
204 
205  if (config->pop_bytes > 0)
206  {
207  ethernet_pbb_header_packed_t *ph = (ethernet_pbb_header_packed_t *) eth;
208 
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))
214  return 1;
215 
216  eth += config->pop_bytes;
217  }
218 
219  if (config->push_bytes > 0)
220  {
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;
227  }
228 
229  /* Update l2_len */
230  vnet_buffer (b0)->l2.l2_len +=
231  (word) config->push_bytes - (word) config->pop_bytes;
232  /* Update packet len */
234  (word) config->pop_bytes - (word) config->push_bytes);
235 
236  return 0;
237 }
238 
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);
243 
244 /**
245  * Configure vtag tag rewrite on the given interface.
246  * Return 1 if there is an error, 0 if ok
247  */
248 u32 l2vtr_configure (vlib_main_t * vlib_main,
249  vnet_main_t * vnet_main,
250  u32 sw_if_index,
251  u32 vtr_op, u32 push_dot1q, u32 vtr_tag1, u32 vtr_tag2);
252 
253 /**
254  * Get vtag tag rewrite on the given interface.
255  * Return 1 if there is an error, 0 if ok
256  */
257 u32 l2vtr_get (vlib_main_t * vlib_main,
258  vnet_main_t * vnet_main,
259  u32 sw_if_index,
260  u32 * vtr_op,
261  u32 * push_dot1q, u32 * vtr_tag1, u32 * vtr_tag2);
262 
263 /**
264  * Get pbb tag rewrite on the given interface.
265  * Return 1 if there is an error, 0 if ok
266  */
267 u32 l2pbb_get (vlib_main_t * vlib_main,
268  vnet_main_t * vnet_main,
269  u32 sw_if_index,
270  u32 * vtr_op,
271  u16 * outer_tag,
272  ethernet_header_t * eth_hdr, u16 * b_vlanid, u32 * i_sid);
273 
274 #endif /* included_vnet_l2_vtr_h */
275 
276 
277 /*
278  * fd.io coding-style-patch-verification: ON
279  *
280  * Local Variables:
281  * eval: (c-set-style "gnu")
282  * End:
283  */
u8 push_bytes
Definition: l2_vtr.h:61
u8 pop_bytes
Definition: l2_vtr.h:62
u32 l2pbb_configure(vlib_main_t *vlib_main, vnet_main_t *vnet_main, u32 sw_if_index, u32 vtr_op, u8 *b_dmac, u8 *b_smac, u16 b_vlanid, u32 i_sid, u16 vlan_outer_tag)
Definition: l2_vtr.c:54
static u32 l2_pbb_process(vlib_buffer_t *b0, ptr_config_t *config)
Definition: l2_vtr.h:201
u16 push_and_pop_bytes
Definition: l2_vtr.h:64
Per-interface vlan tag rewrite configuration There will be one instance of this struct for each sw_if...
Definition: l2_vtr.h:45
u16 push_and_pop_bytes
Definition: l2_vtr.h:196
#define always_inline
Definition: clib.h:92
unsigned long u64
Definition: types.h:89
u8 push_bytes
Definition: l2_vtr.h:193
static u32 l2_vtr_process(vlib_buffer_t *b0, vtr_config_t *config)
Perform the configured tag rewrite on the packet.
Definition: l2_vtr.h:75
u64 data1
Definition: l2_vtr.h:183
#define ethernet_buffer_adjust_vlan_count_by_bytes(b, v)
Adjusts the vlan count by the header size byte delta in &#39;v&#39;.
Definition: ethernet.h:381
u16 data3
Definition: l2_vtr.h:185
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:195
#define PREDICT_FALSE(x)
Definition: clib.h:105
u64 data2
Definition: l2_vtr.h:184
static u8 l2_efp_filter_process(vlib_buffer_t *b0, vtr_config_t *in_config)
Definition: l2_vtr.h:141
u8 pop_bytes
Definition: l2_vtr.h:194
u32 l2vtr_get(vlib_main_t *vlib_main, vnet_main_t *vnet_main, u32 sw_if_index, u32 *vtr_op, u32 *push_dot1q, u32 *vtr_tag1, u32 *vtr_tag2)
Get vtag tag rewrite on the given interface.
Definition: l2_vtr.c:347
struct ptr_config_t::@227::@231 raw_data
unsigned int u32
Definition: types.h:88
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:208
u64 raw_tags
Definition: l2_vtr.h:54
l2_vtr_op_t
Definition: l2_vtr.h:27
u32 l2pbb_get(vlib_main_t *vlib_main, vnet_main_t *vnet_main, u32 sw_if_index, u32 *vtr_op, u16 *outer_tag, ethernet_header_t *eth_hdr, u16 *b_vlanid, u32 *i_sid)
Get pbb tag rewrite on the given interface.
Definition: l2_vtr.c:686
unsigned short u16
Definition: types.h:57
i64 word
Definition: types.h:111
unsigned char u8
Definition: types.h:56
u32 l2vtr_configure(vlib_main_t *vlib_main, vnet_main_t *vnet_main, u32 sw_if_index, u32 vtr_op, u32 push_dot1q, u32 vtr_tag1, u32 vtr_tag2)
Configure vtag tag rewrite on the given interface.
Definition: l2_vtr.c:136
ethernet_pbb_header_t macs_tags
Definition: l2_vtr.h:180
#define vnet_buffer(b)
Definition: buffer.h:326
u32 data4
Definition: l2_vtr.h:186
u32 priority_dei_uca_res_sid
Definition: packet.h:120