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Vector Packet Processing
ipsec_if_in.c
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1 /*
2  * ipsec_if_in.c : IPSec interface input node
3  *
4  * Copyright (c) 2015 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 #include <vnet/vnet.h>
19 #include <vnet/api_errno.h>
20 #include <vnet/ip/ip.h>
21 
22 #include <vnet/ipsec/ipsec.h>
23 #include <vnet/ipsec/esp.h>
24 
25 /* Statistics (not really errors) */
26 #define foreach_ipsec_if_input_error \
27 _(RX, "good packets received") \
28 _(DISABLED, "ipsec packets received on disabled interface")
29 
30 static char *ipsec_if_input_error_strings[] = {
31 #define _(sym,string) string,
33 #undef _
34 };
35 
36 typedef enum
37 {
38 #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
40 #undef _
43 
44 
45 typedef struct
46 {
50 
51 u8 *
52 format_ipsec_if_input_trace (u8 * s, va_list * args)
53 {
54  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
55  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
56  ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);
57 
58  s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
59  return s;
60 }
61 
62 static uword
64  vlib_frame_t * from_frame)
65 {
66  ipsec_main_t *im = &ipsec_main;
67  vnet_main_t *vnm = im->vnet_main;
70  u32 *from, *to_next = 0, next_index;
71  u32 n_left_from, last_sw_if_index = ~0;
72  u32 thread_index = vm->thread_index;
73  u64 n_bytes = 0, n_packets = 0;
74  u8 icv_len;
75  ipsec_tunnel_if_t *last_t = NULL;
76  ipsec_sa_t *sa0;
77  vlib_combined_counter_main_t *rx_counter;
78  vlib_combined_counter_main_t *drop_counter;
79  u32 n_disabled = 0;
80 
83 
84  from = vlib_frame_vector_args (from_frame);
85  n_left_from = from_frame->n_vectors;
86  next_index = node->cached_next_index;
87 
88  while (n_left_from > 0)
89  {
90  u32 n_left_to_next;
91 
92  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
93 
94  while (n_left_from > 0 && n_left_to_next > 0)
95  {
96  u32 bi0, next0, sw_if_index0;
97  vlib_buffer_t *b0;
98  ip4_header_t *ip0;
99  esp_header_t *esp0;
100  uword *p;
101  u32 len0;
102 
103  bi0 = to_next[0] = from[0];
104  from += 1;
105  n_left_from -= 1;
106  to_next += 1;
107  n_left_to_next -= 1;
108  b0 = vlib_get_buffer (vm, bi0);
109  ip0 = vlib_buffer_get_current (b0);
110  esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
111 
112  next0 = IPSEC_INPUT_NEXT_DROP;
113 
114  u64 key = (u64) ip0->src_address.as_u32 << 32 |
115  (u64) clib_net_to_host_u32 (esp0->spi);
116 
117  p = hash_get (im->ipsec_if_pool_index_by_key, key);
118 
119  len0 = vlib_buffer_length_in_chain (vm, b0);
120 
121  if (p)
122  {
124  t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
125  vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
126  if (t->hw_if_index != ~0)
127  {
129 
130  vnet_buffer (b0)->ipsec.flags = 0;
131  hi = vnet_get_hw_interface (vnm, t->hw_if_index);
132  sw_if_index0 = hi->sw_if_index;
133  vnet_buffer (b0)->sw_if_index[VLIB_RX] = sw_if_index0;
134 
135  if (PREDICT_FALSE
137  {
139  (drop_counter, thread_index, sw_if_index0, 1, len0);
140  b0->error = node->errors[IPSEC_IF_INPUT_ERROR_DISABLED];
141  n_disabled++;
142  goto trace;
143  }
144 
145  if (PREDICT_TRUE (sw_if_index0 == last_sw_if_index))
146  {
147  n_packets++;
148  n_bytes += len0;
149  }
150  else
151  {
152  sa0 = pool_elt_at_index (im->sad, t->input_sa_index);
153  icv_len =
155  integ_alg].trunc_size;
156 
157  /* length = packet length - ESP/tunnel overhead */
158  n_bytes -= n_packets * (sizeof (ip4_header_t) +
159  sizeof (esp_header_t) +
160  sizeof (esp_footer_t) +
161  16 /* aes-cbc IV */ + icv_len);
162 
163  if (last_t)
164  {
166  (rx_counter, thread_index, sw_if_index0,
167  n_packets, n_bytes);
168  }
169 
170  last_sw_if_index = sw_if_index0;
171  last_t = t;
172  n_packets = 1;
173  n_bytes = len0;
174  }
175  }
176  else
177  {
178  vnet_buffer (b0)->ipsec.flags = IPSEC_FLAG_IPSEC_GRE_TUNNEL;
179  }
180 
182  next0 = im->esp_decrypt_next_index;
183  }
184 
185  trace:
186  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
187  {
189  vlib_add_trace (vm, node, b0, sizeof (*tr));
190  tr->spi = clib_host_to_net_u32 (esp0->spi);
191  tr->seq = clib_host_to_net_u32 (esp0->seq);
192  }
193 
194  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
195  n_left_to_next, bi0, next0);
196  }
197  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
198  }
199 
200  if (last_t)
201  {
202  sa0 = pool_elt_at_index (im->sad, last_t->input_sa_index);
204 
205  n_bytes -= n_packets * (sizeof (ip4_header_t) + sizeof (esp_header_t) +
206  sizeof (esp_footer_t) + 16 /* aes-cbc IV */ +
207  icv_len);
209  thread_index,
210  last_sw_if_index, n_packets, n_bytes);
211  }
212 
214  IPSEC_IF_INPUT_ERROR_RX,
215  from_frame->n_vectors - n_disabled);
216 
218  IPSEC_IF_INPUT_ERROR_DISABLED, n_disabled);
219 
220  return from_frame->n_vectors;
221 }
222 
223 /* *INDENT-OFF* */
225  .function = ipsec_if_input_node_fn,
226  .name = "ipsec-if-input",
227  .vector_size = sizeof (u32),
228  .format_trace = format_ipsec_if_input_trace,
229  .type = VLIB_NODE_TYPE_INTERNAL,
230 
232  .error_strings = ipsec_if_input_error_strings,
233 
234  .sibling_of = "ipsec-input-ip4",
235 };
236 /* *INDENT-ON* */
237 
239 /*
240  * fd.io coding-style-patch-verification: ON
241  *
242  * Local Variables:
243  * eval: (c-set-style "gnu")
244  * End:
245  */
vmrglw vmrglh hi
ipsec_if_input_error_t
Definition: ipsec_if_in.c:36
static vlib_cli_command_t trace
(constructor) VLIB_CLI_COMMAND (trace)
Definition: vlib_api_cli.c:862
#define CLIB_UNUSED(x)
Definition: clib.h:81
ipsec_tunnel_if_t * tunnel_interfaces
Definition: ipsec.h:268
static void vlib_increment_combined_counter(vlib_combined_counter_main_t *cm, u32 thread_index, u32 index, u64 n_packets, u64 n_bytes)
Increment a combined counter.
Definition: counter.h:204
ip4_address_t src_address
Definition: ip4_packet.h:169
ipsec_proto_main_integ_alg_t * ipsec_proto_main_integ_algs
Definition: esp.h:101
vnet_interface_main_t interface_main
Definition: vnet.h:56
#define PREDICT_TRUE(x)
Definition: clib.h:108
unsigned long u64
Definition: types.h:89
#define foreach_ipsec_if_input_error
Definition: ipsec_if_in.c:26
#define NULL
Definition: clib.h:57
u8 * format_ipsec_if_input_trace(u8 *s, va_list *args)
Definition: ipsec_if_in.c:52
ipsec_integ_alg_t integ_alg
Definition: ipsec.h:121
static vnet_hw_interface_t * vnet_get_hw_interface(vnet_main_t *vnm, u32 hw_if_index)
u32 thread_index
Definition: main.h:179
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
#define VNET_HW_INTERFACE_FLAG_LINK_UP
Definition: interface.h:494
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:472
static uword ipsec_if_input_node_fn(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
Definition: ipsec_if_in.c:63
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:263
uword * ipsec_if_pool_index_by_key
Definition: ipsec.h:286
unsigned char u8
Definition: types.h:56
ipsec_main_t ipsec_main
Definition: ipsec.c:30
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:855
unsigned int u32
Definition: types.h:88
vlib_node_registration_t ipsec_if_input_node
(constructor) VLIB_REGISTER_NODE (ipsec_if_input_node)
Definition: ipsec_if_in.c:224
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:209
#define hash_get(h, key)
Definition: hash.h:249
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:464
vnet_main_t * vnet_main
Definition: ipsec.h:277
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:205
#define PREDICT_FALSE(x)
Definition: clib.h:107
#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:218
#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:364
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:138
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1176
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:155
u16 n_vectors
Definition: node.h:401
vlib_main_t * vm
Definition: buffer.c:294
u32 esp_decrypt_next_index
Definition: ipsec.h:297
#define ARRAY_LEN(x)
Definition: clib.h:61
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:455
static char * ipsec_if_input_error_strings[]
Definition: ipsec_if_in.c:30
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:513
ipsec_sa_t * sad
Definition: ipsec.h:265
u32 seq
Definition: esp.h:28
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:218
u32 spi
Definition: esp.h:27
u32 input_sa_index
Definition: ipsec.h:249
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:57
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:267
A collection of combined counters.
Definition: counter.h:172
#define vnet_buffer(b)
Definition: buffer.h:344
ipsec_proto_main_t ipsec_proto_main
Definition: esp_encrypt.c:26
static int ip4_header_bytes(const ip4_header_t *i)
Definition: ip4_packet.h:234
u32 flags
buffer flags: VLIB_BUFFER_FREE_LIST_INDEX_MASK: bits used to store free list index, VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:116
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:58
#define IPSEC_FLAG_IPSEC_GRE_TUNNEL
Definition: ipsec.h:21
Definition: defs.h:46