FD.io VPP  v17.04.2-2-ga8f93f8
Vector Packet Processing
node.c
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1 /*
2  * Copyright (c) 2015 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 #include <vlib/vlib.h>
16 #include <vnet/vnet.h>
17 #include <vnet/pg/pg.h>
18 #include <vppinfra/error.h>
19 #include <srv6-localsid/srv6_localsid_sample.h>
20 
21 typedef struct {
24 
25 /* packet trace format function */
26 static u8 * format_srv6_localsid_sample_trace (u8 * s, va_list * args)
27 {
28  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
29  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
31  s = format (s, "SRv6-sample-localsid: localsid_index %d\n",
32  t->localsid_index);
33  return s;
34 }
35 
37 
38 #define foreach_srv6_localsid_counter \
39 _(PROCESSED, "srv6-sample-localsid processed packets") \
40 _(NO_SRH, "(Error) No SRH.")
41 
42 typedef enum {
43 #define _(sym,str) SRV6_LOCALSID_COUNTER_##sym,
45 #undef _
48 
49 static char * srv6_localsid_counter_strings[] = {
50 #define _(sym,string) string,
52 #undef _
53 };
54 
55 typedef enum {
60 
61 /**
62  * @brief Function doing End processing.
63  */
64 //Fixme: support OAM (hop-by-hop header) here!
67  vlib_buffer_t * b0,
68  ip6_header_t * ip0,
69  ip6_sr_header_t * sr0,
70  u32 * next0)
71 {
72  ip6_address_t *new_dst0;
73 
74  if(PREDICT_TRUE(ip0->protocol == IP_PROTOCOL_IPV6_ROUTE))
75  {
77  {
78  if(PREDICT_TRUE(sr0->segments_left != 0))
79  {
80  sr0->segments_left -= 1;
81  new_dst0 = (ip6_address_t *)(sr0->segments);
82  new_dst0 += sr0->segments_left;
83  ip0->dst_address.as_u64[0] = new_dst0->as_u64[0];
84  ip0->dst_address.as_u64[1] = new_dst0->as_u64[1];
85  }
86  else
87  {
89  b0->error = node->errors[SRV6_LOCALSID_COUNTER_NO_SRH];
90  }
91  }
92  else
93  {
94  /* Error. Routing header of type != SR */
96  b0->error = node->errors[SRV6_LOCALSID_COUNTER_NO_SRH];
97  }
98  }
99 }
100 
101 /*
102  * @brief SRv6 Sample Localsid graph node
103  * WARNING: YOU MUST DO THE DUAL LOOP
104  */
105 static uword
107 {
108  u32 n_left_from, * from, * to_next;
109  u32 next_index;
110  u32 pkts_swapped = 0;
111 
112  ip6_sr_main_t * sm = &sr_main;
113 
114  from = vlib_frame_vector_args (frame);
115  n_left_from = frame->n_vectors;
116  next_index = node->cached_next_index;
117  u32 cpu_index = os_get_cpu_number ();
118 
119  while (n_left_from > 0)
120  {
121  u32 n_left_to_next;
122 
123  vlib_get_next_frame (vm, node, next_index,
124  to_next, n_left_to_next);
125 
126  while (n_left_from > 0 && n_left_to_next > 0)
127  {
128  u32 bi0;
129  vlib_buffer_t * b0;
130  ip6_header_t * ip0 = 0;
131  ip6_sr_header_t * sr0;
133  ip6_sr_localsid_t *ls0;
135 
136  bi0 = from[0];
137  to_next[0] = bi0;
138  from += 1;
139  to_next += 1;
140  n_left_from -= 1;
141  n_left_to_next -= 1;
142 
143  b0 = vlib_get_buffer (vm, bi0);
144  ip0 = vlib_buffer_get_current (b0);
145  sr0 = (ip6_sr_header_t *)(ip0+1);
146 
147  /* Lookup the SR End behavior based on IP DA (adj) */
148  ls0 = pool_elt_at_index (sm->localsids, vnet_buffer(b0)->ip.adj_index[VLIB_TX]);
149  ls0_mem = ls0->plugin_mem;
150 
151  /* SRH processing */
152  end_srh_processing (node, b0, ip0, sr0, &next0);
153 
154  /* ==================================================================== */
155  /* INSERT CODE HERE */
156  /* Example starts here */
157  //In this example we are changing the next VRF table by the one in CLI
158  vnet_buffer(b0)->sw_if_index[VLIB_TX] = ls0_mem->fib_table;
159  /* Example finishes here */
160  /* ==================================================================== */
161 
163  {
164  srv6_localsid_sample_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
165  tr->localsid_index = ls0 - sm->localsids;
166  }
167 
168  /* This increments the SRv6 per LocalSID counters.*/
171  cpu_index,
172  ls0 - sm->localsids,
173  1, vlib_buffer_length_in_chain (vm, b0));
174 
175  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
176  n_left_to_next, bi0, next0);
177 
178  pkts_swapped ++;
179  }
180  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
181 
182  }
183 
184  return frame->n_vectors;
185 }
186 
188  .function = srv6_localsid_sample_fn,
189  .name = "srv6-localsid-sample",
190  .vector_size = sizeof (u32),
191  .format_trace = format_srv6_localsid_sample_trace,
192  .type = VLIB_NODE_TYPE_INTERNAL,
193  .n_errors = SRV6_LOCALSID_N_COUNTERS,
194  .error_strings = srv6_localsid_counter_strings,
195  .n_next_nodes = SRV6_SAMPLE_LOCALSID_N_NEXT,
196  .next_nodes = {
197  [SRV6_SAMPLE_LOCALSID_NEXT_IP6LOOKUP] = "ip6-lookup",
198  [SRV6_SAMPLE_LOCALSID_NEXT_ERROR] = "error-drop",
199  },
200 };
ip6_sr_main_t sr_main
Definition: sr.c:31
#define CLIB_UNUSED(x)
Definition: clib.h:79
static uword srv6_localsid_sample_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame)
Definition: node.c:106
SR LocalSID.
Definition: sr.h:101
#define PREDICT_TRUE(x)
Definition: clib.h:98
u64 as_u64[2]
Definition: ip6_packet.h:51
void vlib_put_next_frame(vlib_main_t *vm, vlib_node_runtime_t *r, u32 next_index, u32 n_vectors_left)
Release pointer to next frame vector data.
Definition: main.c:459
struct _vlib_node_registration vlib_node_registration_t
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
#define ROUTING_HEADER_TYPE_SR
Definition: sr_packet.h:116
static u8 * format_srv6_localsid_sample_trace(u8 *s, va_list *args)
Definition: node.c:26
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:418
static uword vlib_buffer_length_in_chain(vlib_main_t *vm, vlib_buffer_t *b)
Get length in bytes of the buffer chain.
Definition: buffer_funcs.h:100
vlib_combined_counter_main_t sr_ls_invalid_counters
Definition: sr.h:228
vlib_combined_counter_main_t sr_ls_valid_counters
Definition: sr.h:227
srv6_localsid_sample_counters
Definition: node.c:42
#define static_always_inline
Definition: clib.h:85
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:397
uword os_get_cpu_number(void)
Definition: unix-misc.c:224
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:188
#define PREDICT_FALSE(x)
Definition: clib.h:97
#define vlib_validate_buffer_enqueue_x1(vm, node, next_index, to_next, n_left_to_next, bi0, next0)
Finish enqueueing one buffer forward in the graph.
Definition: buffer_node.h:216
static char * srv6_localsid_counter_strings[]
Definition: node.c:49
#define vlib_get_next_frame(vm, node, next_index, vectors, n_vectors_left)
Get pointer to next frame vector data by (vlib_node_runtime_t, next_index).
Definition: node_funcs.h:350
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:113
ip6_sr_localsid_t * localsids
Definition: sr.h:203
u16 n_vectors
Definition: node.h:344
vlib_main_t * vm
Definition: buffer.c:276
static_always_inline void end_srh_processing(vlib_node_runtime_t *node, vlib_buffer_t *b0, ip6_header_t *ip0, ip6_sr_header_t *sr0, u32 *next0)
Function doing End processing.
Definition: node.c:66
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:85
vlib_node_registration_t srv6_localsid_sample_node
(constructor) VLIB_REGISTER_NODE (srv6_localsid_sample_node)
Definition: node.c:36
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:455
unsigned int u32
Definition: types.h:88
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 cpu_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:211
void * plugin_mem
Memory to be used by the plugin callback functions.
Definition: sr.h:123
u64 uword
Definition: types.h:112
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
Definition: defs.h:47
unsigned char u8
Definition: types.h:56
ip6_address_t segments[0]
Definition: sr_packet.h:148
srv6_localsid_sample_next_t
Definition: node.c:55
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:253
#define foreach_srv6_localsid_counter
Definition: node.c:38
#define vnet_buffer(b)
Definition: buffer.h:294
Segment Routing main datastructure.
Definition: sr.h:188
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:74
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:57
ip6_address_t dst_address
Definition: ip6_packet.h:341