FD.io VPP  v16.09
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 
29 static char *ipsec_if_input_error_strings[] = {
30 #define _(sym,string) string,
32 #undef _
33 };
34 
35 typedef enum
36 {
37 #define _(sym,str) IPSEC_IF_INPUT_ERROR_##sym,
39 #undef _
42 
43 typedef enum
44 {
49 
50 typedef struct
51 {
55 
56 
57 u8 *
58 format_ipsec_if_input_trace (u8 * s, va_list * args)
59 {
60  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
61  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
62  ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);
63 
64  s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
65  return s;
66 }
67 
68 static uword
70  vlib_frame_t * from_frame)
71 {
72  ipsec_main_t *im = &ipsec_main;
73  u32 *from, *to_next = 0, next_index;
74  u32 n_left_from;
75 
76  from = vlib_frame_vector_args (from_frame);
77  n_left_from = from_frame->n_vectors;
78  next_index = node->cached_next_index;
79 
80  while (n_left_from > 0)
81  {
82  u32 n_left_to_next;
83 
84  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
85 
86  while (n_left_from > 0 && n_left_to_next > 0)
87  {
88  u32 bi0, next0;
89  vlib_buffer_t *b0;
90  ip4_header_t *ip0;
91  esp_header_t *esp0;
92  uword *p;
93 
94  bi0 = to_next[0] = from[0];
95  from += 1;
96  n_left_from -= 1;
97  to_next += 1;
98  n_left_to_next -= 1;
99  b0 = vlib_get_buffer (vm, bi0);
100  ip0 = vlib_buffer_get_current (b0);
101  esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
102 
103  next0 = IPSEC_IF_INPUT_NEXT_DROP;
104 
105  u64 key = (u64) ip0->src_address.as_u32 << 32 |
106  (u64) clib_net_to_host_u32 (esp0->spi);
107 
108  p = hash_get (im->ipsec_if_pool_index_by_key, key);
109 
110  if (p)
111  {
113  t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
114  vnet_buffer (b0)->output_features.ipsec_sad_index =
115  t->input_sa_index;
116  vnet_buffer (b0)->output_features.ipsec_flags =
120  }
121 
123  {
125  vlib_add_trace (vm, node, b0, sizeof (*tr));
126  tr->spi = clib_host_to_net_u32 (esp0->spi);
127  tr->seq = clib_host_to_net_u32 (esp0->seq);
128  }
129 
130  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
131  n_left_to_next, bi0, next0);
132  }
133  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
134  }
135 
137  IPSEC_IF_INPUT_ERROR_RX,
138  from_frame->n_vectors);
139 
140  return from_frame->n_vectors;
141 }
142 
143 /* *INDENT-OFF* */
145  .function = ipsec_if_input_node_fn,
146  .name = "ipsec-if-input",
147  .vector_size = sizeof (u32),
148  .format_trace = format_ipsec_if_input_trace,
150 
152  .error_strings = ipsec_if_input_error_strings,
153 
154  .n_next_nodes = IPSEC_IF_INPUT_N_NEXT,
155 
156  .next_nodes = {
157  [IPSEC_IF_INPUT_NEXT_ESP_DECRYPT] = "esp-decrypt",
158  [IPSEC_IF_INPUT_NEXT_DROP] = "error-drop",
159  },
160 };
161 /* *INDENT-ON* */
162 
164 /*
165  * fd.io coding-style-patch-verification: ON
166  *
167  * Local Variables:
168  * eval: (c-set-style "gnu")
169  * End:
170  */
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:457
ipsec_if_input_error_t
Definition: ipsec_if_in.c:35
#define CLIB_UNUSED(x)
Definition: clib.h:79
ipsec_tunnel_if_t * tunnel_interfaces
Definition: ipsec.h:211
ip4_address_t src_address
Definition: ip4_packet.h:138
bad routing header type(not 4)") sr_error (NO_MORE_SEGMENTS
ipsec_if_input_next_t
Definition: ipsec_if_in.c:43
#define foreach_ipsec_if_input_error
Definition: ipsec_if_in.c:26
static int ip4_header_bytes(ip4_header_t *i)
Definition: ip4_packet.h:186
u8 * format_ipsec_if_input_trace(u8 *s, va_list *args)
Definition: ipsec_if_in.c:58
ipsec_main_t ipsec_main
Definition: ipsec.h:238
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:69
uword * ipsec_if_pool_index_by_key
Definition: ipsec.h:229
static void * vlib_buffer_get_current(vlib_buffer_t *b)
Get pointer to current data to process.
Definition: buffer.h:187
unsigned long u64
Definition: types.h:89
vlib_node_registration_t ipsec_if_input_node
(constructor) VLIB_REGISTER_NODE (ipsec_if_input_node)
Definition: ipsec_if_in.c:144
#define hash_get(h, key)
Definition: hash.h:248
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:369
#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:130
#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:348
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1111
u16 n_vectors
Definition: node.h:344
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:200
#define ARRAY_LEN(x)
Definition: clib.h:59
static char * ipsec_if_input_error_strings[]
Definition: ipsec_if_in.c:29
u16 cached_next_index
Definition: node.h:462
unsigned int u32
Definition: types.h:88
#define vnet_buffer(b)
Definition: buffer.h:335
u8 * format(u8 *s, char *fmt,...)
Definition: format.c:418
u32 seq
Definition: esp.h:26
u32 spi
Definition: esp.h:25
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:93
u32 input_sa_index
Definition: ipsec.h:199
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
unsigned char u8
Definition: types.h:56
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:251
#define VLIB_NODE_FUNCTION_MULTIARCH(node, fn)
Definition: node.h:158
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:143
u32 flags
buffer flags: VLIB_BUFFER_IS_TRACED: trace this buffer.
Definition: buffer.h:85
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:69
#define IPSEC_FLAG_IPSEC_GRE_TUNNEL
Definition: ipsec.h:19