FD.io VPP  v17.04-9-g99c0734
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 
44 typedef struct
45 {
49 
50 u8 *
51 format_ipsec_if_input_trace (u8 * s, va_list * args)
52 {
53  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
54  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
55  ipsec_if_input_trace_t *t = va_arg (*args, ipsec_if_input_trace_t *);
56 
57  s = format (s, "IPSec: spi %u seq %u", t->spi, t->seq);
58  return s;
59 }
60 
61 static uword
63  vlib_frame_t * from_frame)
64 {
65  ipsec_main_t *im = &ipsec_main;
66  u32 *from, *to_next = 0, next_index;
67  u32 n_left_from;
68 
69  from = vlib_frame_vector_args (from_frame);
70  n_left_from = from_frame->n_vectors;
71  next_index = node->cached_next_index;
72 
73  while (n_left_from > 0)
74  {
75  u32 n_left_to_next;
76 
77  vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
78 
79  while (n_left_from > 0 && n_left_to_next > 0)
80  {
81  u32 bi0, next0;
82  vlib_buffer_t *b0;
83  ip4_header_t *ip0;
84  esp_header_t *esp0;
85  uword *p;
86 
87  bi0 = to_next[0] = from[0];
88  from += 1;
89  n_left_from -= 1;
90  to_next += 1;
91  n_left_to_next -= 1;
92  b0 = vlib_get_buffer (vm, bi0);
93  ip0 = vlib_buffer_get_current (b0);
94  esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
95 
96  next0 = IPSEC_INPUT_NEXT_DROP;
97 
98  u64 key = (u64) ip0->src_address.as_u32 << 32 |
99  (u64) clib_net_to_host_u32 (esp0->spi);
100 
101  p = hash_get (im->ipsec_if_pool_index_by_key, key);
102 
103  if (p)
104  {
106  t = pool_elt_at_index (im->tunnel_interfaces, p[0]);
107  vnet_buffer (b0)->ipsec.sad_index = t->input_sa_index;
108  vnet_buffer (b0)->ipsec.flags =
111  next0 = im->esp_decrypt_next_index;
112  }
113 
115  {
117  vlib_add_trace (vm, node, b0, sizeof (*tr));
118  tr->spi = clib_host_to_net_u32 (esp0->spi);
119  tr->seq = clib_host_to_net_u32 (esp0->seq);
120  }
121 
122  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
123  n_left_to_next, bi0, next0);
124  }
125  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
126  }
127 
129  IPSEC_IF_INPUT_ERROR_RX,
130  from_frame->n_vectors);
131 
132  return from_frame->n_vectors;
133 }
134 
135 /* *INDENT-OFF* */
137  .function = ipsec_if_input_node_fn,
138  .name = "ipsec-if-input",
139  .vector_size = sizeof (u32),
140  .format_trace = format_ipsec_if_input_trace,
141  .type = VLIB_NODE_TYPE_INTERNAL,
142 
144  .error_strings = ipsec_if_input_error_strings,
145 
146  .sibling_of = "ipsec-input-ip4",
147 };
148 /* *INDENT-ON* */
149 
151 /*
152  * fd.io coding-style-patch-verification: ON
153  *
154  * Local Variables:
155  * eval: (c-set-style "gnu")
156  * End:
157  */
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:250
ip4_address_t src_address
Definition: ip4_packet.h:163
#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:226
u8 * format_ipsec_if_input_trace(u8 *s, va_list *args)
Definition: ipsec_if_in.c: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
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:418
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:62
uword * ipsec_if_pool_index_by_key
Definition: ipsec.h:268
ipsec_main_t ipsec_main
Definition: ipsec.h:282
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:136
#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:397
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
#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
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1112
u16 n_vectors
Definition: node.h:344
vlib_main_t * vm
Definition: buffer.c:276
u32 esp_decrypt_next_index
Definition: ipsec.h:276
#define VLIB_BUFFER_IS_TRACED
Definition: buffer.h:85
#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
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
u32 seq
Definition: esp.h:25
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:201
u32 spi
Definition: esp.h:24
u32 input_sa_index
Definition: ipsec.h:232
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:253
#define vnet_buffer(b)
Definition: buffer.h:294
#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: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
#define IPSEC_FLAG_IPSEC_GRE_TUNNEL
Definition: ipsec.h:18