FD.io VPP  v20.01-48-g3e0dafb74
Vector Packet Processing
node.c
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1 /*
2  * node.c: ipip packet processing
3  *
4  * Copyright (c) 2018 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 aipiped 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 <vlib/vlib.h>
19 #include <vnet/ipip/ipip.h>
20 #include <vnet/ip/ip6_packet.h>
21 #include <vnet/mpls/mpls.h>
22 #include <vnet/pg/pg.h>
23 #include <vppinfra/sparse_vec.h>
24 
25 #define foreach_ipip_input_next \
26  _(PUNT, "error-punt") \
27  _(DROP, "error-drop") \
28  _(IP4_INPUT, "ip4-input") \
29  _(IP6_INPUT, "ip6-input")
30 
31 typedef enum
32 {
33 #define _(s, n) IPIP_INPUT_NEXT_##s,
35 #undef _
38 
39 typedef struct
40 {
43  ip46_address_t src;
44  ip46_address_t dst;
47 
48 static u8 *
49 format_ipip_rx_trace (u8 * s, va_list * args)
50 {
51  CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
52  CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
53  ipip_rx_trace_t *t = va_arg (*args, ipip_rx_trace_t *);
54 
55  s = format (s, "IPIP: tunnel %d len %d src %U dst %U", t->tunnel_id,
56  clib_net_to_host_u16 (t->length), format_ip46_address, &t->src,
58  return s;
59 }
60 
63  vlib_frame_t * from_frame, bool is_ipv6)
64 {
66  u32 n_left_from, next_index, *from, *to_next, n_left_to_next;
67  u32 tunnel_sw_if_index = ~0;
68  u32 thread_index = vm->thread_index;
69  u32 len;
71 
72  from = vlib_frame_vector_args (from_frame);
73  n_left_from = from_frame->n_vectors;
74  next_index = node->cached_next_index;
75  while (n_left_from > 0)
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;
82  vlib_buffer_t *b0;
83  ip4_header_t *ip40;
84  ip6_header_t *ip60;
85  u32 next0 = IPIP_INPUT_NEXT_DROP;
86  ip46_address_t src0 = ip46_address_initializer, dst0 =
88  ipip_transport_t transport0;
89  u8 inner_protocol0;
90 
91  bi0 = to_next[0] = from[0];
92  from += 1;
93  n_left_from -= 1;
94  to_next += 1;
95  n_left_to_next -= 1;
96 
97  b0 = vlib_get_buffer (vm, bi0);
98 
99  if (is_ipv6)
100  {
101  ip60 = vlib_buffer_get_current (b0);
102  /* Check for outer fragmentation */
103  if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
104  {
105  next0 = IPIP_INPUT_NEXT_DROP;
106  b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
107  goto drop;
108  }
109 
110  vlib_buffer_advance (b0, sizeof (*ip60));
111  ip_set (&src0, &ip60->src_address, false);
112  ip_set (&dst0, &ip60->dst_address, false);
113  inner_protocol0 = ip60->protocol;
114  transport0 = IPIP_TRANSPORT_IP6;
115  }
116  else
117  {
118  ip40 = vlib_buffer_get_current (b0);
119  /* Check for outer fragmentation */
120  if (ip40->flags_and_fragment_offset &
121  clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS))
122  {
123  next0 = IPIP_INPUT_NEXT_DROP;
124  b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
125  goto drop;
126  }
127  vlib_buffer_advance (b0, sizeof (*ip40));
128  ip_set (&src0, &ip40->src_address, true);
129  ip_set (&dst0, &ip40->dst_address, true);
130  inner_protocol0 = ip40->protocol;
131  transport0 = IPIP_TRANSPORT_IP4;
132  }
133 
134  /*
135  * Find tunnel. First a lookup for P2P tunnels, then a lookup
136  * for multipoint tunnels
137  */
138  ipip_tunnel_key_t key0 = {.transport = transport0,
139  .fib_index = vnet_buffer (b0)->ip.fib_index,
140  .src = dst0,
141  .dst = src0
142  };
143  ipip_tunnel_t *t0 = ipip_tunnel_db_find (&key0);
144  if (!t0)
145  {
146  ip46_address_reset (&key0.dst);
147  t0 = ipip_tunnel_db_find (&key0);
148  if (!t0)
149  {
150  next0 = IPIP_INPUT_NEXT_DROP;
151  b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
152  goto drop;
153  }
154  }
155  tunnel_sw_if_index = t0->sw_if_index;
156 
157  len = vlib_buffer_length_in_chain (vm, b0);
158  vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
159 
160  if (inner_protocol0 == IP_PROTOCOL_IPV6)
161  {
162  next0 = IPIP_INPUT_NEXT_IP6_INPUT;
163 
164  if (t0->flags & IPIP_TUNNEL_FLAG_DECAP_COPY_ECN)
165  {
166  if (is_ipv6)
167  ip6_set_ecn_network_order ((ip60 + 1),
168  ip6_ecn_network_order (ip60));
169  else
170  ip6_set_ecn_network_order ((ip6_header_t *) (ip40 + 1),
171  ip4_header_get_ecn (ip40));
172  }
173  }
174  else if (inner_protocol0 == IP_PROTOCOL_IP_IN_IP)
175  {
176  next0 = IPIP_INPUT_NEXT_IP4_INPUT;
177  if (t0->flags & IPIP_TUNNEL_FLAG_DECAP_COPY_ECN)
178  {
179  if (is_ipv6)
182  (ip60));
183  else
184  ip4_header_set_ecn_w_chksum (ip40 + 1,
185  ip4_header_get_ecn (ip40));
186  }
187  }
188 
189  if (!is_ipv6 && t0->mode == IPIP_MODE_6RD
190  && t0->sixrd.security_check)
191  {
192  ip6_header_t *inner_ip60 = vlib_buffer_get_current (b0);
193  if (sixrd_get_addr_net (t0, inner_ip60->src_address.as_u64[0])
194  != ip40->src_address.as_u32)
195  {
196  next0 = IPIP_INPUT_NEXT_DROP;
197  b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
198  goto drop;
199  }
200  }
201 
204  thread_index, tunnel_sw_if_index,
205  1 /* packets */ ,
206  len /* bytes */ );
207 
208  drop:
209  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
210  {
211  ipip_rx_trace_t *tr =
212  vlib_add_trace (vm, node, b0, sizeof (*tr));
213  tr->tunnel_id = tunnel_sw_if_index;
214  if (is_ipv6)
215  {
216  tr->length = ip60->payload_length;
217  tr->src.ip6.as_u64[0] = ip60->src_address.as_u64[0];
218  tr->src.ip6.as_u64[1] = ip60->src_address.as_u64[1];
219  tr->dst.ip6.as_u64[0] = ip60->dst_address.as_u64[0];
220  tr->dst.ip6.as_u64[1] = ip60->dst_address.as_u64[1];
221  }
222  else
223  {
224  tr->length = ip40->length;
225  tr->src.ip4.as_u32 = ip40->src_address.as_u32;
226  tr->dst.ip4.as_u32 = ip40->dst_address.as_u32;
227  }
228  }
229 
230  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
231  n_left_to_next, bi0, next0);
232  }
233 
234  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
235  }
237  !is_ipv6 ? ipip4_input_node.index :
238  ipip6_input_node.index, IPIP_ERROR_DECAP_PKTS,
239  from_frame->n_vectors);
240  return from_frame->n_vectors;
241 }
242 
244  vlib_frame_t * from_frame)
245 {
246  return ipip_input (vm, node, from_frame, /* is_ip6 */ false);
247 }
248 
250  vlib_frame_t * from_frame)
251 {
252  return ipip_input (vm, node, from_frame, /* is_ip6 */ true);
253 }
254 
255 static char *ipip_error_strings[] = {
256 #define _(sym,string) string,
258 #undef _
259 };
260 
261 /* *INDENT-OFF* */
263  .name = "ipip4-input",
264  /* Takes a vector of packets. */
265  .vector_size = sizeof(u32),
266  .n_errors = IPIP_N_ERROR,
267  .error_strings = ipip_error_strings,
268  .n_next_nodes = IPIP_INPUT_N_NEXT,
269  .next_nodes =
270  {
271 #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
273 #undef _
274  },
275  .format_trace = format_ipip_rx_trace,
276 };
277 
279  .name = "ipip6-input",
280  /* Takes a vector of packets. */
281  .vector_size = sizeof(u32),
282  .n_errors = IPIP_N_ERROR,
283  .error_strings = ipip_error_strings,
284  .n_next_nodes = IPIP_INPUT_N_NEXT,
285  .next_nodes =
286  {
287 #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
289 #undef _
290  },
291  .format_trace = format_ipip_rx_trace,
292 };
293 
294 /* *INDENT-ON* */
295 
296 /*
297  * fd.io coding-style-patch-verification: ON
298  *
299  * Local Variables:
300  * eval: (c-set-style "gnu")
301  * End:
302  */
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:124
#define CLIB_UNUSED(x)
Definition: clib.h:82
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:220
ip4_address_t src_address
Definition: ip4_packet.h:170
vlib_node_registration_t ipip6_input_node
(constructor) VLIB_REGISTER_NODE (ipip6_input_node)
Definition: node.c:278
A representation of a IPIP tunnel.
Definition: ipip.h:92
vnet_interface_main_t interface_main
Definition: vnet.h:56
u64 as_u64[2]
Definition: ip6_packet.h:51
void ip_set(ip46_address_t *dst, void *src, u8 is_ip4)
Definition: ip.c:90
#define foreach_ipip_input_next
Definition: node.c:25
static char * ipip_error_strings[]
Definition: node.c:255
static void ip4_header_set_ecn_w_chksum(ip4_header_t *ip4, ip_ecn_t ecn)
Definition: ip4_packet.h:287
u32 thread_index
Definition: main.h:218
ipip_tunnel_flags_t flags
Definition: ipip.h:107
u32 length
Definition: node.c:42
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:424
u16 flags_and_fragment_offset
Definition: ip4_packet.h:151
#define VLIB_NODE_FN(node)
Definition: node.h:202
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:470
static_always_inline ip_ecn_t ip6_ecn_network_order(const ip6_header_t *ip6)
Definition: ip6_packet.h:331
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:366
ip6_address_t src_address
Definition: ip6_packet.h:307
unsigned char u8
Definition: types.h:56
static_always_inline u32 sixrd_get_addr_net(const ipip_tunnel_t *t, u64 dal)
Definition: ipip.h:149
static void ip46_address_reset(ip46_address_t *ip46)
Definition: ip46_address.h:74
u8 is_ipv6
Definition: node.c:45
ip4_address_t dst_address
Definition: ip4_packet.h:170
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:863
ip46_address_t dst
Definition: ipip.h:56
unsigned int u32
Definition: types.h:88
ipip_transport_t transport
Definition: ipip.h:57
#define foreach_ipip_error
Definition: ipip.h:29
vlib_error_t error
Error code for buffers to be enqueued to error handler.
Definition: buffer.h:136
vlib_node_registration_t ipip4_input_node
(constructor) VLIB_REGISTER_NODE (ipip4_input_node)
Definition: node.c:262
ipip_tunnel_t * ipip_tunnel_db_find(ipip_tunnel_key_t *key)
Definition: ipip.c:370
#define gm
Definition: dlmalloc.c:1219
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:111
#define always_inline
Definition: ipsec.h:28
#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:338
vlib_main_t * vm
Definition: in2out_ed.c:1810
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1150
u8 len
Definition: ip_types.api:91
format_function_t format_ip46_address
Definition: ip46_address.h:50
ipip_input_next_t
Definition: node.c:31
#define IP4_HEADER_FLAG_MORE_FRAGMENTS
Definition: ip4_packet.h:152
ipip_transport_t
IPIP Tunnel key.
Definition: ipip.h:47
ipip_main_t ipip_main
Definition: ipip.c:29
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:169
u16 n_vectors
Definition: node.h:397
ip46_address_t dst
Definition: node.c:44
static_always_inline void ip6_set_ecn_network_order(ip6_header_t *ip6, ip_ecn_t ecn)
Definition: ip6_packet.h:358
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:456
vlib_main_t vlib_node_runtime_t * node
Definition: in2out_ed.c:1810
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:515
bool security_check
Definition: ipip.h:117
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:248
u32 tunnel_id
Definition: node.c:41
u32 sw_if_index
Definition: ipip.h:104
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
u16 payload_length
Definition: ip6_packet.h:298
vnet_main_t * vnet_main
Definition: ipip.h:130
static u8 * format_ipip_rx_trace(u8 *s, va_list *args)
Definition: node.c:49
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
ipip_mode_t mode
Definition: ipip.h:97
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:244
static ip_ecn_t ip4_header_get_ecn(const ip4_header_t *ip4)
Definition: ip4_packet.h:305
#define vnet_buffer(b)
Definition: buffer.h:408
static uword ipip_input(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame, bool is_ipv6)
Definition: node.c:62
struct ipip_tunnel_t::@338 sixrd
ip46_address_t src
Definition: node.c:43
static vlib_buffer_t * vlib_get_buffer(vlib_main_t *vm, u32 buffer_index)
Translate buffer index into buffer pointer.
Definition: buffer_funcs.h:85
#define ip46_address_initializer
Definition: ip46_address.h:52
Definition: defs.h:46
ip6_address_t dst_address
Definition: ip6_packet.h:307
u8 is_ipv6
Definition: acl_types.api:38