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Vector Packet Processing
gre_api.c
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1 /*
2  *------------------------------------------------------------------
3  * gre_api.c - gre api
4  *
5  * Copyright (c) 2016 Cisco and/or its affiliates.
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at:
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  *------------------------------------------------------------------
18  */
19 
20 #include <vnet/vnet.h>
21 #include <vlibmemory/api.h>
22 
23 #include <vnet/interface.h>
24 #include <vnet/api_errno.h>
25 
26 #include <vnet/gre/gre.h>
27 #include <vnet/fib/fib_table.h>
28 
29 #include <vnet/vnet_msg_enum.h>
30 
31 #define vl_typedefs /* define message structures */
32 #include <vnet/vnet_all_api_h.h>
33 #undef vl_typedefs
34 
35 #define vl_endianfun /* define message structures */
36 #include <vnet/vnet_all_api_h.h>
37 #undef vl_endianfun
38 
39 /* instantiate all the print functions we know about */
40 #define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
41 #define vl_printfun
42 #include <vnet/vnet_all_api_h.h>
43 #undef vl_printfun
44 
46 
47 #define foreach_vpe_api_msg \
48 _(GRE_ADD_DEL_TUNNEL, gre_add_del_tunnel) \
49 _(GRE_TUNNEL_DUMP, gre_tunnel_dump)
50 
53 {
55  int rv = 0;
57  u32 outer_fib_id;
58  uword *p;
59  ip4_main_t *im = &ip4_main;
60  u32 sw_if_index = ~0;
61 
62  p = hash_get (im->fib_index_by_table_id, ntohl (mp->outer_fib_id));
63  if (!p)
64  {
65  rv = VNET_API_ERROR_NO_SUCH_FIB;
66  goto out;
67  }
68  outer_fib_id = p[0];
69 
70  /* Check src & dst are different */
71  if ((mp->is_ipv6 && memcmp (mp->src_address, mp->dst_address, 16) == 0) ||
72  (!mp->is_ipv6 && memcmp (mp->src_address, mp->dst_address, 4) == 0))
73  {
74  rv = VNET_API_ERROR_SAME_SRC_DST;
75  goto out;
76  }
77  memset (a, 0, sizeof (*a));
78 
79  a->is_add = mp->is_add;
80  a->teb = mp->teb;
81 
82  /* ip addresses sent in network byte order */
83  clib_memcpy (&(a->src), mp->src_address, 4);
84  clib_memcpy (&(a->dst), mp->dst_address, 4);
85 
86  a->outer_fib_id = outer_fib_id;
87  rv = vnet_gre_add_del_tunnel (a, &sw_if_index);
88 
89 out:
90  /* *INDENT-OFF* */
91  REPLY_MACRO2(VL_API_GRE_ADD_DEL_TUNNEL_REPLY,
92  ({
93  rmp->sw_if_index = ntohl (sw_if_index);
94  }));
95  /* *INDENT-ON* */
96 }
97 
98 static void send_gre_tunnel_details
100 {
102  ip4_main_t *im = &ip4_main;
103 
104  rmp = vl_msg_api_alloc (sizeof (*rmp));
105  memset (rmp, 0, sizeof (*rmp));
106  rmp->_vl_msg_id = ntohs (VL_API_GRE_TUNNEL_DETAILS);
107  clib_memcpy (rmp->src_address, &(t->tunnel_src), 4);
108  clib_memcpy (rmp->dst_address, &(t->tunnel_dst), 4);
109  rmp->outer_fib_id = htonl (im->fibs[t->outer_fib_index].ft_table_id);
110  rmp->teb = (GRE_TUNNEL_TYPE_TEB == t->type);
111  rmp->sw_if_index = htonl (t->sw_if_index);
112  rmp->context = context;
113 
114  vl_msg_api_send_shmem (q, (u8 *) & rmp);
115 }
116 
117 static void
119 {
121  gre_main_t *gm = &gre_main;
122  gre_tunnel_t *t;
123  u32 sw_if_index;
124 
126  if (q == 0)
127  {
128  return;
129  }
130 
131  sw_if_index = ntohl (mp->sw_if_index);
132 
133  if (~0 == sw_if_index)
134  {
135  /* *INDENT-OFF* */
136  pool_foreach (t, gm->tunnels,
137  ({
138  send_gre_tunnel_details(t, q, mp->context);
139  }));
140  /* *INDENT-ON* */
141  }
142  else
143  {
144  if ((sw_if_index >= vec_len (gm->tunnel_index_by_sw_if_index)) ||
145  (~0 == gm->tunnel_index_by_sw_if_index[sw_if_index]))
146  {
147  return;
148  }
149  t = &gm->tunnels[gm->tunnel_index_by_sw_if_index[sw_if_index]];
150  send_gre_tunnel_details (t, q, mp->context);
151  }
152 }
153 
154 /*
155  * gre_api_hookup
156  * Add vpe's API message handlers to the table.
157  * vlib has alread mapped shared memory and
158  * added the client registration handlers.
159  * See .../vlib-api/vlibmemory/memclnt_vlib.c:memclnt_process()
160  */
161 #define vl_msg_name_crc_list
162 #include <vnet/vnet_all_api_h.h>
163 #undef vl_msg_name_crc_list
164 
165 static void
167 {
168 #define _(id,n,crc) vl_msg_api_add_msg_name_crc (am, #n "_" #crc, id);
169  foreach_vl_msg_name_crc_gre;
170 #undef _
171 }
172 
173 static clib_error_t *
175 {
176  api_main_t *am = &api_main;
177 
178 #define _(N,n) \
179  vl_msg_api_set_handlers(VL_API_##N, #n, \
180  vl_api_##n##_t_handler, \
181  vl_noop_handler, \
182  vl_api_##n##_t_endian, \
183  vl_api_##n##_t_print, \
184  sizeof(vl_api_##n##_t), 1);
186 #undef _
187 
188  /*
189  * Set up the (msg_name, crc, message-id) table
190  */
192 
193  return 0;
194 }
195 
197 
198 /*
199  * fd.io coding-style-patch-verification: ON
200  *
201  * Local Variables:
202  * eval: (c-set-style "gnu")
203  * End:
204  */
GRE related global data.
Definition: gre.h:130
static clib_error_t * gre_api_hookup(vlib_main_t *vm)
Definition: gre_api.c:174
a
Definition: bitmap.h:516
void vl_msg_api_send_shmem(unix_shared_memory_queue_t *q, u8 *elem)
#define REPLY_MACRO2(t, body)
VLIB_API_INIT_FUNCTION(gre_api_hookup)
u32 outer_fib_index
The FIB in which the src.dst address are present.
Definition: gre.h:98
unix_shared_memory_queue_t * vl_api_client_index_to_input_queue(u32 index)
u32 * tunnel_index_by_sw_if_index
Mapping from sw_if_index to tunnel index.
Definition: gre.h:160
ip4_address_t tunnel_dst
The tunnel&#39;s destination/remote address.
Definition: gre.h:94
static void vl_api_gre_tunnel_dump_t_handler(vl_api_gre_tunnel_dump_t *mp)
Definition: gre_api.c:118
api_main_t api_main
Definition: api_shared.c:35
u32 sw_if_index
Definition: gre.h:100
#define pool_foreach(VAR, POOL, BODY)
Iterate through pool.
Definition: pool.h:376
static void vl_api_gre_add_del_tunnel_t_handler(vl_api_gre_add_del_tunnel_t *mp)
Definition: gre_api.c:52
#define hash_get(h, key)
Definition: hash.h:248
A representation of a GRE tunnel.
Definition: gre.h:81
uword * fib_index_by_table_id
Hash table mapping table id to fib index.
Definition: ip4.h:130
gre_tunnel_type_t type
Definition: gre.h:101
void * vl_msg_api_alloc(int nbytes)
u32 ft_table_id
Table ID (hash key) for this FIB.
Definition: fib_table.h:56
vlib_main_t * vm
Definition: buffer.c:276
static void setup_message_id_table(api_main_t *am)
Definition: gre_api.c:166
#define clib_memcpy(a, b, c)
Definition: string.h:69
ip4_address_t tunnel_src
The tunnel&#39;s source/local address.
Definition: gre.h:90
unsigned int u32
Definition: types.h:88
static void send_gre_tunnel_details(gre_tunnel_t *t, unix_shared_memory_queue_t *q, u32 context)
Definition: gre_api.c:99
gre_tunnel_t * tunnels
pool of tunnel instances
Definition: gre.h:134
IPv4 main type.
Definition: ip4.h:107
u64 uword
Definition: types.h:112
int vnet_gre_add_del_tunnel(vnet_gre_add_del_tunnel_args_t *a, u32 *sw_if_indexp)
Definition: interface.c:438
#define vec_len(v)
Number of elements in vector (rvalue-only, NULL tolerant)
#define foreach_vpe_api_msg
Definition: gre_api.c:47
unsigned char u8
Definition: types.h:56
Transparent Ethernet Bridging - the tunnel is in L2 mode.
Definition: gre.h:68
ip4_main_t ip4_main
Global ip4 main structure.
Definition: ip4_forward.c:1117
struct fib_table_t_ * fibs
Vector of FIBs.
Definition: ip4.h:112
gre_main_t gre_main
Definition: gre.c:22
struct _unix_shared_memory_queue unix_shared_memory_queue_t