FD.io VPP  v21.01.1
Vector Packet Processing
node.c
Go to the documentation of this file.
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/tunnel/tunnel_dp.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  u8 inner_protocol0;
87 
88  bi0 = to_next[0] = from[0];
89  from += 1;
90  n_left_from -= 1;
91  to_next += 1;
92  n_left_to_next -= 1;
93 
94  b0 = vlib_get_buffer (vm, bi0);
95 
96  ipip_tunnel_key_t key0 = {
97  .fib_index = vnet_buffer (b0)->ip.fib_index,
98  .mode = IPIP_MODE_P2P,
99  };
100 
101  if (is_ipv6)
102  {
103  ip60 = vlib_buffer_get_current (b0);
104  /* Check for outer fragmentation */
105  if (ip60->protocol == IP_PROTOCOL_IPV6_FRAGMENTATION)
106  {
107  next0 = IPIP_INPUT_NEXT_DROP;
108  b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
109  goto drop;
110  }
111 
112  vlib_buffer_advance (b0, sizeof (*ip60));
113  ip_set (&key0.dst, &ip60->src_address, false);
114  ip_set (&key0.src, &ip60->dst_address, false);
115  inner_protocol0 = ip60->protocol;
116  key0.transport = IPIP_TRANSPORT_IP6;
117  }
118  else
119  {
120  ip40 = vlib_buffer_get_current (b0);
121  /* Check for outer fragmentation */
122  if (ip40->flags_and_fragment_offset &
123  clib_host_to_net_u16 (IP4_HEADER_FLAG_MORE_FRAGMENTS))
124  {
125  next0 = IPIP_INPUT_NEXT_DROP;
126  b0->error = node->errors[IPIP_ERROR_FRAGMENTED_PACKET];
127  goto drop;
128  }
129  vlib_buffer_advance (b0, sizeof (*ip40));
130  ip_set (&key0.dst, &ip40->src_address, true);
131  ip_set (&key0.src, &ip40->dst_address, true);
132  inner_protocol0 = ip40->protocol;
133  key0.transport = IPIP_TRANSPORT_IP4;
134  }
135 
136  /*
137  * Find tunnel. First a lookup for P2P tunnels, then a lookup
138  * for multipoint tunnels
139  */
140  ipip_tunnel_t *t0 = ipip_tunnel_db_find (&key0);
141  if (!t0)
142  {
143  ip46_address_reset (&key0.dst);
144  key0.mode = IPIP_MODE_6RD;
145  t0 = ipip_tunnel_db_find (&key0);
146  if (!t0)
147  {
148  next0 = IPIP_INPUT_NEXT_DROP;
149  b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
150  goto drop;
151  }
152  }
153  tunnel_sw_if_index = t0->sw_if_index;
154 
155  len = vlib_buffer_length_in_chain (vm, b0);
156  vnet_buffer (b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
157 
158  if (inner_protocol0 == IP_PROTOCOL_IPV6)
159  {
160  next0 = IPIP_INPUT_NEXT_IP6_INPUT;
161 
162  if (is_ipv6)
163  tunnel_decap_fixup_6o6 (t0->flags, (ip60 + 1), ip60);
164  else
166  (ip6_header_t *) (ip40 + 1), ip40);
167  }
168  else if (inner_protocol0 == IP_PROTOCOL_IP_IN_IP)
169  {
170  next0 = IPIP_INPUT_NEXT_IP4_INPUT;
171 
172  if (is_ipv6)
174  (ip4_header_t *) (ip60 + 1), ip60);
175  else
176  tunnel_decap_fixup_4o4 (t0->flags, ip40 + 1, ip40);
177  }
178 
179  if (!is_ipv6 && t0->mode == IPIP_MODE_6RD
180  && t0->sixrd.security_check)
181  {
182  ip6_header_t *inner_ip60 = vlib_buffer_get_current (b0);
183  if (sixrd_get_addr_net (t0, inner_ip60->src_address.as_u64[0])
184  != ip40->src_address.as_u32)
185  {
186  next0 = IPIP_INPUT_NEXT_DROP;
187  b0->error = node->errors[IPIP_ERROR_NO_TUNNEL];
188  goto drop;
189  }
190  }
191 
194  thread_index, tunnel_sw_if_index,
195  1 /* packets */ ,
196  len /* bytes */ );
197 
198  drop:
199  if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
200  {
201  ipip_rx_trace_t *tr =
202  vlib_add_trace (vm, node, b0, sizeof (*tr));
203  tr->tunnel_id = tunnel_sw_if_index;
204  if (is_ipv6)
205  {
206  tr->length = ip60->payload_length;
207  tr->src.ip6.as_u64[0] = ip60->src_address.as_u64[0];
208  tr->src.ip6.as_u64[1] = ip60->src_address.as_u64[1];
209  tr->dst.ip6.as_u64[0] = ip60->dst_address.as_u64[0];
210  tr->dst.ip6.as_u64[1] = ip60->dst_address.as_u64[1];
211  }
212  else
213  {
214  tr->length = ip40->length;
215  tr->src.ip4.as_u32 = ip40->src_address.as_u32;
216  tr->dst.ip4.as_u32 = ip40->dst_address.as_u32;
217  }
218  }
219 
220  vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
221  n_left_to_next, bi0, next0);
222  }
223 
224  vlib_put_next_frame (vm, node, next_index, n_left_to_next);
225  }
227  !is_ipv6 ? ipip4_input_node.index :
228  ipip6_input_node.index, IPIP_ERROR_DECAP_PKTS,
229  from_frame->n_vectors);
230  return from_frame->n_vectors;
231 }
232 
234  vlib_frame_t * from_frame)
235 {
236  return ipip_input (vm, node, from_frame, /* is_ip6 */ false);
237 }
238 
240  vlib_frame_t * from_frame)
241 {
242  return ipip_input (vm, node, from_frame, /* is_ip6 */ true);
243 }
244 
245 static char *ipip_error_strings[] = {
246 #define _(sym,string) string,
248 #undef _
249 };
250 
251 /* *INDENT-OFF* */
253  .name = "ipip4-input",
254  /* Takes a vector of packets. */
255  .vector_size = sizeof(u32),
256  .n_errors = IPIP_N_ERROR,
257  .error_strings = ipip_error_strings,
258  .n_next_nodes = IPIP_INPUT_N_NEXT,
259  .next_nodes =
260  {
261 #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
263 #undef _
264  },
265  .format_trace = format_ipip_rx_trace,
266 };
267 
269  .name = "ipip6-input",
270  /* Takes a vector of packets. */
271  .vector_size = sizeof(u32),
272  .n_errors = IPIP_N_ERROR,
273  .error_strings = ipip_error_strings,
274  .n_next_nodes = IPIP_INPUT_N_NEXT,
275  .next_nodes =
276  {
277 #define _(s, n) [IPIP_INPUT_NEXT_##s] = n,
279 #undef _
280  },
281  .format_trace = format_ipip_rx_trace,
282 };
283 
284 /* *INDENT-ON* */
285 
286 /*
287  * fd.io coding-style-patch-verification: ON
288  *
289  * Local Variables:
290  * eval: (c-set-style "gnu")
291  * End:
292  */
ipip_tunnel_t * ipip_tunnel_db_find(const ipip_tunnel_key_t *key)
Definition: ipip.c:493
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 foreach_ipip_input_next
Definition: node.c:25
static char * ipip_error_strings[]
Definition: node.c:245
#define CLIB_UNUSED(x)
Definition: clib.h:87
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:239
ip4_address_t src_address
Definition: ip4_packet.h:125
A representation of a IPIP tunnel.
Definition: ipip.h:75
vnet_interface_main_t interface_main
Definition: vnet.h:65
void ip_set(ip46_address_t *dst, void *src, u8 is_ip4)
Definition: ip.c:93
struct ipip_tunnel_t::@428 sixrd
u32 thread_index
Definition: main.h:250
u32 length
Definition: node.c:42
vlib_main_t * vm
Definition: in2out_ed.c:1580
u16 flags_and_fragment_offset
Definition: ip4_packet.h:106
#define VLIB_NODE_FN(node)
Definition: node.h:203
vlib_error_t * errors
Vector of errors for this node.
Definition: node.h:470
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:402
ip6_address_t src_address
Definition: ip6_packet.h:310
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:131
static void ip46_address_reset(ip46_address_t *ip46)
Definition: ip46_address.h:74
static_always_inline void tunnel_decap_fixup_6o6(tunnel_encap_decap_flags_t flags, ip6_header_t *inner, const ip6_header_t *outer)
Definition: tunnel_dp.h:132
u8 is_ipv6
Definition: node.c:45
static u8 * format_ipip_rx_trace(u8 *s, va_list *args)
Definition: node.c:49
ip4_address_t dst_address
Definition: ip4_packet.h:125
vlib_combined_counter_main_t * combined_sw_if_counters
Definition: interface.h:882
description fragment has unexpected format
Definition: map.api:433
unsigned int u32
Definition: types.h:88
static_always_inline void tunnel_decap_fixup_4o4(tunnel_encap_decap_flags_t flags, ip4_header_t *inner, const ip4_header_t *outer)
Definition: tunnel_dp.h:148
#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
tunnel_encap_decap_flags_t flags
Definition: ipip.h:89
#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:233
#define PREDICT_FALSE(x)
Definition: clib.h:121
#define always_inline
Definition: ipsec.h:28
vlib_node_registration_t ipip6_input_node
(constructor) VLIB_REGISTER_NODE (ipip6_input_node)
Definition: node.c:268
#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:224
#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:391
static void vlib_node_increment_counter(vlib_main_t *vm, u32 node_index, u32 counter_index, u64 increment)
Definition: node_funcs.h:1231
u8 len
Definition: ip_types.api:103
format_function_t format_ip46_address
Definition: ip46_address.h:50
#define IP4_HEADER_FLAG_MORE_FRAGMENTS
Definition: ip4_packet.h:107
ipip_main_t ipip_main
Definition: ipip.c:31
#define VLIB_REGISTER_NODE(x,...)
Definition: node.h:170
u16 n_vectors
Definition: node.h:397
ip46_address_t dst
Definition: node.c:44
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:483
static_always_inline void tunnel_decap_fixup_4o6(tunnel_encap_decap_flags_t flags, ip4_header_t *inner, const ip6_header_t *outer)
Definition: tunnel_dp.h:124
vlib_main_t vlib_node_runtime_t * node
Definition: in2out_ed.c:1580
u16 cached_next_index
Next frame index that vector arguments were last enqueued to last time this node ran.
Definition: node.h:511
static_always_inline void tunnel_decap_fixup_6o4(tunnel_encap_decap_flags_t flags, ip6_header_t *inner, const ip4_header_t *outer)
Definition: tunnel_dp.h:140
vlib_node_registration_t ipip4_input_node
(constructor) VLIB_REGISTER_NODE (ipip4_input_node)
Definition: node.c:252
bool security_check
Definition: ipip.h:99
static void vlib_buffer_advance(vlib_buffer_t *b, word l)
Advance current data pointer by the supplied (signed!) amount.
Definition: buffer.h:252
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
u32 tunnel_id
Definition: node.c:41
u32 sw_if_index
Definition: ipip.h:86
ipip_input_next_t
Definition: node.c:31
u16 payload_length
Definition: ip6_packet.h:301
vnet_main_t * vnet_main
Definition: ipip.h:112
VLIB buffer representation.
Definition: buffer.h:102
u64 uword
Definition: types.h:112
ipip_mode_t mode
Definition: ipip.h:80
static void * vlib_frame_vector_args(vlib_frame_t *f)
Get pointer to frame vector data.
Definition: node_funcs.h:297
#define vnet_buffer(b)
Definition: buffer.h:417
void * vlib_add_trace(vlib_main_t *vm, vlib_node_runtime_t *r, vlib_buffer_t *b, u32 n_data_bytes)
Definition: trace.c:634
bool is_ipv6
Definition: dhcp.api:202
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
Definition: defs.h:46
ip6_address_t dst_address
Definition: ip6_packet.h:310