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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/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 {
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  */
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  */
77 {
78  u64 temp_8;
79  u32 temp_4;
80  u8 *eth;
81 
82  eth = vlib_buffer_get_current (b0);
83 
84  /* copy the 12B dmac and smac to a temporary location */
85  temp_8 = *((u64 *) eth);
86  temp_4 = *((u32 *) (eth + 8));
87 
88  /* adjust for popped tags */
89  eth += config->pop_bytes;
90 
91  /* if not enough tags to pop then drop packet */
92  if (PREDICT_FALSE ((vnet_buffer (b0)->l2.l2_len - 12) < config->pop_bytes))
93  {
94  return 1;
95  }
96 
97  /* copy the 2 new tags to the start of the packet */
98  *((u64 *) (eth + 12 - 8)) = config->raw_tags;
99 
100  /* TODO: set cos bits */
101 
102  /* adjust for pushed tags: */
103  eth -= config->push_bytes;
104 
105  /* copy the 12 dmac and smac back to the packet */
106  *((u64 *) eth) = temp_8;
107  *((u32 *) (eth + 8)) = temp_4;
108 
109  /* Update l2 parameters */
110  vnet_buffer (b0)->l2.l2_len +=
111  (word) config->push_bytes - (word) config->pop_bytes;
112  vnet_buffer (b0)->l2_hdr_offset -=
113  (word) config->push_bytes - (word) config->pop_bytes;
114 
115  /* Update vlan tag count */
117  (word) config->push_bytes -
118  (word) config->pop_bytes);
119 
120  /* Update packet len */
122  (word) config->pop_bytes - (word) config->push_bytes);
123 
124  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  */
143 {
144  u8 *eth;
145  u64 packet_tags;
146  u64 tag_mask;
147 
148  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  tag_mask = clib_net_to_host_u64 (0xFFFF0FFFFFFF0FFF);
159  /* mask for one vlan id and ethertype, no cos bits */
160  tag_mask =
161  (in_config->push_bytes ==
162  4) ? clib_net_to_host_u64 (0xFFFF0FFF) : tag_mask;
163  /* mask for always match */
164  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  packet_tags = *((u64 *) (eth + 4 + in_config->push_bytes));
172 
173  /* Check if the packet tags match the configured tags */
174  return (packet_tags & tag_mask) != in_config->raw_tags;
175 }
176 
177 typedef struct
178 {
179  union
180  {
182  struct
183  {
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 
203 {
204  u8 *eth = vlib_buffer_get_current (b0);
205 
206  if (config->pop_bytes > 0)
207  {
208  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  if (clib_net_to_host_u16 (ph->priority_dei_id) !=
212  clib_net_to_host_u16 (config->macs_tags.priority_dei_id)
213  || clib_net_to_host_u32 (ph->priority_dei_uca_res_sid) !=
214  clib_net_to_host_u32 (config->macs_tags.priority_dei_uca_res_sid))
215  return 1;
216 
217  eth += config->pop_bytes;
218  }
219 
220  if (config->push_bytes > 0)
221  {
222  eth -= config->push_bytes;
223  // copy the B-DA (6B), B-SA (6B), B-TAG (4B), I-TAG (6B)
224  *((u64 *) eth) = config->raw_data.data1;
225  *((u64 *) (eth + 8)) = config->raw_data.data2;
226  *((u16 *) (eth + 16)) = config->raw_data.data3;
227  *((u32 *) (eth + 18)) = config->raw_data.data4;
228  }
229 
230  /* Update l2_len */
231  vnet_buffer (b0)->l2.l2_len +=
232  (word) config->push_bytes - (word) config->pop_bytes;
233  /* Update packet len */
235  (word) config->pop_bytes - (word) config->push_bytes);
236 
237  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,
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,
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,
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  */
u8 push_bytes
Definition: l2_vtr.h:62
unsigned long u64
Definition: types.h:89
u8 pop_bytes
Definition: l2_vtr.h:63
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:202
unsigned char u8
Definition: types.h:56
u16 push_and_pop_bytes
Definition: l2_vtr.h:65
Per-interface vlan tag rewrite configuration There will be one instance of this struct for each sw_if...
Definition: l2_vtr.h:46
u16 push_and_pop_bytes
Definition: l2_vtr.h:197
i64 word
Definition: types.h:111
vl_api_interface_index_t sw_if_index
Definition: gre.api:50
#define always_inline
Definition: clib.h:99
unsigned int u32
Definition: types.h:88
u8 push_bytes
Definition: l2_vtr.h:194
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:76
u64 data1
Definition: l2_vtr.h:184
#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:405
u16 data3
Definition: l2_vtr.h:186
unsigned short u16
Definition: types.h:57
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:229
#define PREDICT_FALSE(x)
Definition: clib.h:112
u64 data2
Definition: l2_vtr.h:185
struct ptr_config_t::@299::@303 raw_data
static u8 l2_efp_filter_process(vlib_buffer_t *b0, vtr_config_t *in_config)
Definition: l2_vtr.h:142
u8 pop_bytes
Definition: l2_vtr.h:195
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
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
u64 raw_tags
Definition: l2_vtr.h:55
l2_vtr_op_t
Definition: l2_vtr.h:28
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
VLIB buffer representation.
Definition: buffer.h:102
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:181
#define vnet_buffer(b)
Definition: buffer.h:365
u32 data4
Definition: l2_vtr.h:187
u32 priority_dei_uca_res_sid
Definition: packet.h:182