FD.io VPP  v19.08.3-2-gbabecb413
Vector Packet Processing
ct6_out2in.c
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1 /*
2  * ct6_out2in.c - ip6 connection tracker, inside-to-outside path
3  *
4  * Copyright (c) 2019 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 #include <vlib/vlib.h>
18 #include <vnet/vnet.h>
19 #include <vnet/pg/pg.h>
20 #include <vppinfra/error.h>
21 #include <ct6/ct6.h>
22 
23 typedef struct
24 {
29 
30 #ifndef CLIB_MARCH_VARIANT
31 
32 /* packet trace format function */
33 static u8 *
34 format_ct6_out2in_trace (u8 * s, va_list * args)
35 {
36  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
37  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
38  ct6_out2in_trace_t *t = va_arg (*args, ct6_out2in_trace_t *);
39 
40  s = format (s, "CT6_OUT2IN: sw_if_index %d, next index %d session %d\n",
42  return s;
43 }
44 
46 
47 #endif /* CLIB_MARCH_VARIANT */
48 
49 #define foreach_ct6_out2in_error \
50 _(PROCESSED, "ct6 packets processed") \
51 _(NO_SESSION, "ct6 no session drops")
52 
53 
54 typedef enum
55 {
56 #define _(sym,str) CT6_OUT2IN_ERROR_##sym,
58 #undef _
61 
62 #ifndef CLIB_MARCH_VARIANT
63 static char *ct6_out2in_error_strings[] = {
64 #define _(sym,string) string,
66 #undef _
67 };
68 #endif /* CLIB_MARCH_VARIANT */
69 
70 typedef enum
71 {
74 } ct6_next_t;
75 
78  vlib_node_runtime_t * node, vlib_frame_t * frame,
79  int is_trace)
80 {
81  u32 n_left_from, *from;
82  vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
83  u16 nexts[VLIB_FRAME_SIZE], *next;
84  ct6_main_t *cmp = &ct6_main;
85  u32 my_thread_index = vm->thread_index;
86  f64 now = vlib_time_now (vm);
87  u32 dropped = 0;
88 
89  from = vlib_frame_vector_args (frame);
90  n_left_from = frame->n_vectors;
91 
92  vlib_get_buffers (vm, from, bufs, n_left_from);
93  b = bufs;
94  next = nexts;
95 
96 #if 0
97  while (n_left_from >= 4)
98  {
99  /* Prefetch next iteration. */
100  if (PREDICT_TRUE (n_left_from >= 8))
101  {
102  vlib_prefetch_buffer_header (b[4], STORE);
103  vlib_prefetch_buffer_header (b[5], STORE);
104  vlib_prefetch_buffer_header (b[6], STORE);
105  vlib_prefetch_buffer_header (b[7], STORE);
106  CLIB_PREFETCH (b[4]->data, CLIB_CACHE_LINE_BYTES, STORE);
107  CLIB_PREFETCH (b[5]->data, CLIB_CACHE_LINE_BYTES, STORE);
108  CLIB_PREFETCH (b[6]->data, CLIB_CACHE_LINE_BYTES, STORE);
109  CLIB_PREFETCH (b[7]->data, CLIB_CACHE_LINE_BYTES, STORE);
110  }
111 
112  /* $$$$ process 4x pkts right here */
113  next[0] = 0;
114  next[1] = 0;
115  next[2] = 0;
116  next[3] = 0;
117 
118  if (is_trace)
119  {
120  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
121  {
122  ct6_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t));
123  t->next_index = next[0];
124  t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
125  }
126  if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
127  {
128  ct6_trace_t *t = vlib_add_trace (vm, node, b[1], sizeof (*t));
129  t->next_index = next[1];
130  t->sw_if_index = vnet_buffer (b[1])->sw_if_index[VLIB_RX];
131  }
132  if (b[2]->flags & VLIB_BUFFER_IS_TRACED)
133  {
134  ct6_trace_t *t = vlib_add_trace (vm, node, b[2], sizeof (*t));
135  t->next_index = next[2];
136  t->sw_if_index = vnet_buffer (b[2])->sw_if_index[VLIB_RX];
137  }
138  if (b[3]->flags & VLIB_BUFFER_IS_TRACED)
139  {
140  ct6_trace_t *t = vlib_add_trace (vm, node, b[3], sizeof (*t));
141  t->next_index = next[3];
142  t->sw_if_index = vnet_buffer (b[3])->sw_if_index[VLIB_RX];
143  }
144  }
145 
146  b += 4;
147  next += 4;
148  n_left_from -= 4;
149  }
150 #endif
151 
152  while (n_left_from > 0)
153  {
155  ct6_session_key_t *key0;
156  ct6_session_t *s0;
157  u32 session_index0 = ~0;
158  u32 next0;
159 
160  ip6_header_t *ip0;
161  udp_header_t *udp0;
162 
163  /* Are we having fun yet? */
164  vnet_feature_next (&next0, b[0]);
165  next[0] = next0;
166 
167  ip0 = vlib_buffer_get_current (b[0]);
168 
169  /*
170  * Pass non-global unicast traffic
171  */
173  ||
175  goto trace0;
176  /* Pass non-udp, non-tcp traffic */
177  if (PREDICT_FALSE (ip0->protocol != IP_PROTOCOL_TCP &&
178  ip0->protocol != IP_PROTOCOL_UDP))
179  goto trace0;
180 
181  udp0 = ip6_next_header (ip0);
182 
183  /*
184  * See if we know about this flow.
185  */
186  key0 = (ct6_session_key_t *) & kvp0;
187  clib_memcpy_fast (&key0->src, &ip0->src_address,
188  sizeof (ip6_address_t));
189  clib_memcpy_fast (&key0->dst, &ip0->dst_address,
190  sizeof (ip6_address_t));
191  key0->as_u64[4] = 0;
192  key0->as_u64[5] = 0;
193  key0->sport = udp0->src_port;
194  key0->dport = udp0->dst_port;
195  key0->proto = ip0->protocol;
196 
197  /* Do we know about this session? */
198  if (clib_bihash_search_48_8 (&cmp->session_hash, &kvp0, &kvp0) < 0)
199  {
200  /* Bad engineer, no donut for you... */
201  next[0] = CT6_OUT2IN_NEXT_DROP;
202  b[0]->error = node->errors[CT6_OUT2IN_ERROR_NO_SESSION];
203  dropped++;
204  goto trace0;
205  }
206  else
207  {
208  s0 = pool_elt_at_index (cmp->sessions[my_thread_index], kvp0.value);
209  session_index0 = kvp0.value;
210  ct6_update_session_hit (cmp, s0, now);
211  }
212 
213  trace0:
214  if (is_trace)
215  {
216  if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
217  {
218  ct6_out2in_trace_t *t =
219  vlib_add_trace (vm, node, b[0], sizeof (*t));
220  t->next_index = next[0];
221  t->sw_if_index = vnet_buffer (b[0])->sw_if_index[VLIB_RX];
222  t->session_index = session_index0;
223  }
224  }
225 
226  b += 1;
227  next += 1;
228  n_left_from -= 1;
229  }
230 
231  vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
232 
234  CT6_OUT2IN_ERROR_PROCESSED, frame->n_vectors);
236  CT6_OUT2IN_ERROR_NO_SESSION, dropped);
237 
238  return frame->n_vectors;
239 }
240 
242  vlib_frame_t * frame)
243 {
244  if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE))
245  return ct6_out2in_inline (vm, node, frame, 1 /* is_trace */ );
246  else
247  return ct6_out2in_inline (vm, node, frame, 0 /* is_trace */ );
248 }
249 
250 /* *INDENT-OFF* */
251 #ifndef CLIB_MARCH_VARIANT
253 {
254  .name = "ct6-out2in",
255  .vector_size = sizeof (u32),
256  .format_trace = format_ct6_out2in_trace,
258 
259  .n_errors = ARRAY_LEN(ct6_out2in_error_strings),
260  .error_strings = ct6_out2in_error_strings,
261 
262  .n_next_nodes = CT6_OUT2IN_N_NEXT,
263 
264  /* edit / add dispositions here */
265  .next_nodes = {
266  [CT6_OUT2IN_NEXT_DROP] = "error-drop",
267  },
268 };
269 #endif /* CLIB_MARCH_VARIANT */
270 /* *INDENT-ON* */
271 
272 /*
273  * fd.io coding-style-patch-verification: ON
274  *
275  * Local Variables:
276  * eval: (c-set-style "gnu")
277  * End:
278  */
u32 flags
Definition: vhost_user.h:141
#define CLIB_UNUSED(x)
Definition: clib.h:83
#define PREDICT_TRUE(x)
Definition: clib.h:113
#define clib_memcpy_fast(a, b, c)
Definition: string.h:81
ct6_main_t ct6_main
Definition: ct6.c:53
static f64 vlib_time_now(vlib_main_t *vm)
Definition: main.h:279
u32 thread_index
Definition: main.h:218
static char * ct6_out2in_error_strings[]
Definition: ct6_out2in.c:63
ct6_out2in_error_t
Definition: ct6_out2in.c:54
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
u8 data[128]
Definition: ipsec.api:251
#define VLIB_NODE_FN(node)
Definition: node.h:202
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:470
ip6_address_t src_address
Definition: ip6_packet.h:383
unsigned char u8
Definition: types.h:56
Definition: ct6.h:58
double f64
Definition: types.h:142
ct6_session_t ** sessions
Definition: ct6.h:68
#define always_inline
Definition: clib.h:99
#define vlib_prefetch_buffer_header(b, type)
Prefetch buffer metadata.
Definition: buffer.h:203
unsigned int u32
Definition: types.h:88
#define VLIB_FRAME_SIZE
Definition: node.h:378
vl_api_fib_path_type_t type
Definition: fib_types.api:123
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
ct6_next_t
Definition: ct6_out2in.c:70
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:514
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
u32 node_index
Node index.
Definition: node.h:496
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1150
static uword ct6_out2in_inline(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, int is_trace)
Definition: ct6_out2in.c:77
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
#define foreach_ct6_out2in_error
Definition: ct6_out2in.c:49
u16 n_vectors
Definition: node.h:397
#define CLIB_PREFETCH(addr, size, type)
Definition: cache.h:80
vlib_main_t * vm
Definition: buffer.c:323
static_always_inline void vlib_buffer_enqueue_to_next(vlib_main_t *vm, vlib_node_runtime_t *node, u32 *buffers, u16 *nexts, uword count)
Definition: buffer_node.h:332
static_always_inline void vnet_feature_next(u32 *next0, vlib_buffer_t *b0)
Definition: feature.h:302
#define ARRAY_LEN(x)
Definition: clib.h:63
static void * ip6_next_header(ip6_header_t *i)
Definition: ip6_packet.h:410
static u8 * format_ct6_out2in_trace(u8 *s, va_list *args)
Definition: ct6_out2in.c:34
static void ct6_update_session_hit(ct6_main_t *cmp, ct6_session_t *s0, f64 now)
Definition: ct6.h:165
static void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace_funcs.h:55
struct _vlib_node_registration vlib_node_registration_t
static uword ip6_address_is_global_unicast(const ip6_address_t *a)
Definition: ip6_packet.h:340
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
clib_bihash_48_8_t session_hash
Definition: ct6.h:64
#define vnet_buffer(b)
Definition: buffer.h:365
static_always_inline void vlib_get_buffers(vlib_main_t *vm, u32 *bi, vlib_buffer_t **b, int count)
Translate array of buffer indices into buffer pointers.
Definition: buffer_funcs.h:244
#define VLIB_NODE_FLAG_TRACE
Definition: node.h:302
#define CLIB_CACHE_LINE_BYTES
Definition: cache.h:59
Definition: defs.h:46
vlib_node_registration_t ct6_out2in_node
(constructor) VLIB_REGISTER_NODE (ct6_out2in_node)
Definition: ct6_out2in.c:45
ip6_address_t dst_address
Definition: ip6_packet.h:383