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Vector Packet Processing
adj_glean.c
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1 /*
2  * Copyright (c) 2016 Cisco and/or its affiliates.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #include <vnet/adj/adj.h>
17 #include <vnet/adj/adj_internal.h>
18 #include <vnet/fib/fib_walk.h>
19 
20 /*
21  * The 'DB' of all glean adjs.
22  * There is only one glean per-interface per-protocol, so this is a per-interface
23  * vector
24  */
26 
27 static inline vlib_node_registration_t*
29 {
30  switch (proto) {
31  case FIB_PROTOCOL_IP4:
32  return (&ip4_glean_node);
33  case FIB_PROTOCOL_IP6:
34  return (&ip6_glean_node);
35  case FIB_PROTOCOL_MPLS:
36  break;
37  }
38  ASSERT(0);
39  return (NULL);
40 }
41 
42 /*
43  * adj_glean_add_or_lock
44  *
45  * The next_hop address here is used for source address selection in the DP.
46  * The glean adj is added to an interface's connected prefix, the next-hop
47  * passed here is the local prefix on the same interface.
48  */
51  u32 sw_if_index,
52  const ip46_address_t *nh_addr)
53 {
54  ip_adjacency_t * adj;
55 
57 
58  if (ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index])
59  {
60  adj = adj_alloc(proto);
61 
63  adj->ia_nh_proto = proto;
64  adj_gleans[proto][sw_if_index] = adj_get_index(adj);
65 
66  if (NULL != nh_addr)
67  {
68  adj->sub_type.glean.receive_addr = *nh_addr;
69  }
70 
71  adj->rewrite_header.data_bytes = 0;
72 
74  adj_fib_proto_2_nd(proto),
75  sw_if_index,
76  adj_get_glean_node(proto)->index,
78  &adj->rewrite_header,
79  sizeof (adj->rewrite_data));
80  }
81  else
82  {
83  adj = adj_get(adj_gleans[proto][sw_if_index]);
84  }
85 
86  adj_lock(adj_get_index(adj));
87 
88  return (adj_get_index(adj));
89 }
90 
91 void
93  u32 sw_if_index)
94 {
95  ASSERT(sw_if_index < vec_len(adj_gleans[proto]));
96 
97  adj_gleans[proto][sw_if_index] = ADJ_INDEX_INVALID;
98 }
99 
100 static clib_error_t *
102  u32 sw_if_index,
103  u32 flags)
104 {
105  /*
106  * for each glean on the interface trigger a walk back to the children
107  */
108  fib_protocol_t proto;
109  ip_adjacency_t *adj;
110 
111 
112  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
113  {
114  if (sw_if_index >= vec_len(adj_gleans[proto]) ||
115  ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index])
116  continue;
117 
118  adj = adj_get(adj_gleans[proto][sw_if_index]);
119 
120  fib_node_back_walk_ctx_t bw_ctx = {
124  };
125 
127  }
128 
129  return (NULL);
130 }
131 
133 
134 /**
135  * @brief Invoked on each SW interface of a HW interface when the
136  * HW interface state changes
137  */
138 static void
140  u32 sw_if_index,
141  void *arg)
142 {
143  adj_glean_interface_state_change(vnm, sw_if_index, (uword) arg);
144 }
145 
146 /**
147  * @brief Registered callback for HW interface state changes
148  */
149 static clib_error_t *
151  u32 hw_if_index,
152  u32 flags)
153 {
154  /*
155  * walk SW interfaces on the HW
156  */
157  uword sw_flags;
158 
159  sw_flags = ((flags & VNET_HW_INTERFACE_FLAG_LINK_UP) ?
161  0);
162 
163  vnet_hw_interface_walk_sw(vnm, hw_if_index,
165  (void*) sw_flags);
166 
167  return (NULL);
168 }
169 
172 
173 static clib_error_t *
175  u32 sw_if_index,
176  u32 is_add)
177 {
178  /*
179  * for each glean on the interface trigger a walk back to the children
180  */
181  fib_protocol_t proto;
182  ip_adjacency_t *adj;
183 
184  if (is_add)
185  {
186  /*
187  * not interested in interface additions. we will not back walk
188  * to resolve paths through newly added interfaces. Why? The control
189  * plane should have the brains to add interfaces first, then routes.
190  * So the case where there are paths with a interface that matches
191  * one just created is the case where the path resolved through an
192  * interface that was deleted, and still has not been removed. The
193  * new interface added, is NO GUARANTEE that the interface being
194  * added now, even though it may have the same sw_if_index, is the
195  * same interface that the path needs. So tough!
196  * If the control plane wants these routes to resolve it needs to
197  * remove and add them again.
198  */
199  return (NULL);
200  }
201 
202  for (proto = FIB_PROTOCOL_IP4; proto <= FIB_PROTOCOL_IP6; proto++)
203  {
204  if (sw_if_index >= vec_len(adj_gleans[proto]) ||
205  ADJ_INDEX_INVALID == adj_gleans[proto][sw_if_index])
206  continue;
207 
208  adj = adj_get(adj_gleans[proto][sw_if_index]);
209 
210  fib_node_back_walk_ctx_t bw_ctx = {
212  };
213 
215  }
216 
217  return (NULL);
218 }
219 
221 
222 u8*
223 format_adj_glean (u8* s, va_list *ap)
224 {
225  index_t index = va_arg(*ap, index_t);
226  CLIB_UNUSED(u32 indent) = va_arg(*ap, u32);
227  vnet_main_t * vnm = vnet_get_main();
228  ip_adjacency_t * adj = adj_get(index);
229 
230  return (format(s, "%U-glean: %U",
233  vnm,
235  adj->rewrite_header.sw_if_index)));
236 }
237 
238 
239 static void
241 {
242  adj_lock(dpo->dpoi_index);
243 }
244 static void
246 {
247  adj_unlock(dpo->dpoi_index);
248 }
249 
250 const static dpo_vft_t adj_glean_dpo_vft = {
252  .dv_unlock = adj_dpo_unlock,
253  .dv_format = format_adj_glean,
254  .dv_get_urpf = adj_dpo_get_urpf,
255 };
256 
257 /**
258  * @brief The per-protocol VLIB graph nodes that are assigned to a glean
259  * object.
260  *
261  * this means that these graph nodes are ones from which a glean is the
262  * parent object in the DPO-graph.
263  */
264 const static char* const glean_ip4_nodes[] =
265 {
266  "ip4-glean",
267  NULL,
268 };
269 const static char* const glean_ip6_nodes[] =
270 {
271  "ip6-glean",
272  NULL,
273 };
274 
275 const static char* const * const glean_nodes[DPO_PROTO_NUM] =
276 {
279  [DPO_PROTO_MPLS] = NULL,
280 };
281 
282 void
284 {
285  dpo_register(DPO_ADJACENCY_GLEAN, &adj_glean_dpo_vft, glean_nodes);
286 }
dpo_lock_fn_t dv_lock
A reference counting lock function.
Definition: dpo.h:382
void adj_glean_remove(fib_protocol_t proto, u32 sw_if_index)
Definition: adj_glean.c:92
#define VNET_REWRITE_FOR_SW_INTERFACE_ADDRESS_BROADCAST
Definition: rewrite.h:313
#define CLIB_UNUSED(x)
Definition: clib.h:79
A virtual function table regisitered for a DPO type.
Definition: dpo.h:377
void adj_lock(adj_index_t adj_index)
Take a reference counting lock on the adjacency.
Definition: adj.c:222
vnet_main_t * vnet_get_main(void)
Definition: misc.c:47
adj_index_t adj_glean_add_or_lock(fib_protocol_t proto, u32 sw_if_index, const ip46_address_t *nh_addr)
Glean Adjacency.
Definition: adj_glean.c:50
void vnet_hw_interface_walk_sw(vnet_main_t *vnm, u32 hw_if_index, vnet_hw_sw_interface_walk_t fn, void *ctx)
Walk the SW interfaces on a HW interface - this is the super interface and any sub-interfaces.
Definition: interface.c:967
#define NULL
Definition: clib.h:55
IP unicast adjacency.
Definition: adj.h:174
u32 index_t
A Data-Path Object is an object that represents actions that are applied to packets are they are swit...
Definition: dpo.h:41
struct _vlib_node_registration vlib_node_registration_t
void vnet_rewrite_for_sw_interface(vnet_main_t *vnm, vnet_link_t link_type, u32 sw_if_index, u32 node_index, void *dst_address, vnet_rewrite_header_t *rw, u32 max_rewrite_bytes)
Deprecated.
Definition: rewrite.c:114
static vnet_sw_interface_t * vnet_get_sw_interface(vnet_main_t *vnm, u32 sw_if_index)
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
#define VNET_HW_INTERFACE_FLAG_LINK_UP
Definition: interface.h:394
u32 adj_dpo_get_urpf(const dpo_id_t *dpo)
Definition: adj.c:212
u8 * format_fib_protocol(u8 *s, va_list *ap)
Definition: fib_types.c:30
enum fib_protocol_t_ fib_protocol_t
Protocol Type.
static ip_adjacency_t * adj_get(adj_index_t adj_index)
Get a pointer to an adjacency object from its index.
Definition: adj.h:365
void dpo_register(dpo_type_t type, const dpo_vft_t *vft, const char *const *const *nodes)
For a given DPO type Register:
Definition: dpo.c:306
void fib_walk_sync(fib_node_type_t parent_type, fib_node_index_t parent_index, fib_node_back_walk_ctx_t *ctx)
Back walk all the children of a FIB node.
Definition: fib_walk.c:727
static void adj_nbr_hw_sw_interface_state_change(vnet_main_t *vnm, u32 sw_if_index, void *arg)
Invoked on each SW interface of a HW interface when the HW interface state changes.
Definition: adj_glean.c:139
static adj_index_t * adj_gleans[FIB_PROTOCOL_MAX]
Definition: adj_glean.c:25
void adj_unlock(adj_index_t adj_index)
Release a reference counting lock on the adjacency.
Definition: adj.c:239
struct ip_adjacency_t_::@38::@41 glean
IP_LOOKUP_NEXT_GLEAN.
static clib_error_t * adj_glean_interface_delete(vnet_main_t *vnm, u32 sw_if_index, u32 is_add)
Definition: adj_glean.c:174
The identity of a DPO is a combination of its type and its instance number/index of objects of that t...
Definition: dpo.h:166
fib_node_bw_reason_flag_t fnbw_reason
The reason/trigger for the backwalk.
Definition: fib_node.h:203
format_function_t format_vnet_sw_interface_name
#define ADJ_INDEX_INVALID
Invalid ADJ index - used when no adj is known likewise blazoned capitals INVALID speak volumes where ...
Definition: adj_types.h:36
static adj_index_t adj_get_index(ip_adjacency_t *adj)
Get a pointer to an adjacency object from its index.
Definition: adj_internal.h:86
static clib_error_t * adj_glean_hw_interface_state_change(vnet_main_t *vnm, u32 hw_if_index, u32 flags)
Registered callback for HW interface state changes.
Definition: adj_glean.c:150
vlib_node_registration_t ip6_glean_node
(constructor) VLIB_REGISTER_NODE (ip6_glean_node)
Definition: ip6_forward.c:1912
This packet matches an "interface route" and packets need to be passed to ARP to find rewrite string ...
Definition: adj.h:68
static void adj_dpo_unlock(dpo_id_t *dpo)
Definition: adj_glean.c:245
void adj_glean_module_init(void)
Module initialisation.
Definition: adj_glean.c:283
union ip_adjacency_t_::@38 sub_type
static const char *const glean_ip4_nodes[]
The per-protocol VLIB graph nodes that are assigned to a glean object.
Definition: adj_glean.c:264
static clib_error_t * adj_glean_interface_state_change(vnet_main_t *vnm, u32 sw_if_index, u32 flags)
Definition: adj_glean.c:101
static void adj_dpo_lock(dpo_id_t *dpo)
Definition: adj_glean.c:240
u8 * format_adj_glean(u8 *s, va_list *ap)
Format/display a glean adjacency.
Definition: adj_glean.c:223
u32 adj_index_t
An index for adjacencies.
Definition: adj_types.h:30
static const char *const *const glean_nodes[DPO_PROTO_NUM]
Definition: adj_glean.c:275
static vlib_node_registration_t * adj_get_glean_node(fib_protocol_t proto)
Definition: adj_glean.c:28
VNET_HW_INTERFACE_LINK_UP_DOWN_FUNCTION(adj_glean_hw_interface_state_change)
Context passed between object during a back walk.
Definition: fib_node.h:199
#define VNET_SW_INTERFACE_FLAG_ADMIN_UP
Definition: interface.h:576
#define ASSERT(truth)
unsigned int u32
Definition: types.h:88
VNET_SW_INTERFACE_ADD_DEL_FUNCTION(adj_glean_interface_delete)
static const char *const glean_ip6_nodes[]
Definition: adj_glean.c:269
u64 uword
Definition: types.h:112
fib_protocol_t ia_nh_proto
The protocol of the neighbor/peer.
Definition: adj.h:202
#define DPO_PROTO_NUM
Definition: dpo.h:70
index_t dpoi_index
the index of objects of that type
Definition: dpo.h:182
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
unsigned char u8
Definition: types.h:56
ip_lookup_next_t lookup_next_index
Next hop after ip4-lookup.
Definition: adj.h:189
ip_adjacency_t * adj_alloc(fib_protocol_t proto)
Definition: adj.c:48
#define FIB_PROTOCOL_MAX
Definition outside of enum so it does not need to be included in non-defaulted switch statements...
Definition: fib_types.h:51
vlib_node_registration_t ip4_glean_node
(constructor) VLIB_REGISTER_NODE (ip4_glean_node)
Definition: ip4_forward.c:2171
static vnet_link_t adj_fib_proto_2_nd(fib_protocol_t fp)
Definition: adj_internal.h:67
u32 flags
Definition: vhost-user.h:77
#define vec_validate_init_empty(V, I, INIT)
Make sure vector is long enough for given index and initialize empty space (no header, unspecified alignment)
Definition: vec.h:481
VNET_SW_INTERFACE_ADMIN_UP_DOWN_FUNCTION(adj_glean_interface_state_change)