1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* encap.c : L2TPv3 tunnel encapsulation
*
* Copyright (c) 2013 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <vppinfra/error.h>
#include <vppinfra/hash.h>
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/l2tp/l2tp.h>
/* Statistics (not really errors) */
#define foreach_l2t_encap_error \
_(NETWORK_TO_USER, "L2TP L2 network to user (ip6) pkts") \
_(LOOKUP_FAIL_TO_L3, "L2TP L2 session lookup failed pkts") \
_(ADMIN_DOWN, "L2TP tunnel is down")
static char *l2t_encap_error_strings[] = {
#define _(sym,string) string,
foreach_l2t_encap_error
#undef _
};
typedef enum
{
#define _(sym,str) L2T_ENCAP_ERROR_##sym,
foreach_l2t_encap_error
#undef _
L2T_ENCAP_N_ERROR,
} l2t_encap_error_t;
typedef enum
{
L2T_ENCAP_NEXT_DROP,
L2T_ENCAP_NEXT_IP6_LOOKUP,
L2T_ENCAP_N_NEXT,
} l2t_encap_next_t;
typedef struct
{
u32 cached_session_index;
u32 cached_sw_if_index;
vnet_main_t *vnet_main;
} l2tp_encap_runtime_t;
vlib_node_registration_t l2t_encap_node;
#define NSTAGES 3
static inline void
stage0 (vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index)
{
vlib_buffer_t *b = vlib_get_buffer (vm, buffer_index);
vlib_prefetch_buffer_header (b, STORE);
CLIB_PREFETCH (b->data, 2 * CLIB_CACHE_LINE_BYTES, STORE);
}
static inline void
stage1 (vlib_main_t * vm, vlib_node_runtime_t * node, u32 bi)
{
l2tp_encap_runtime_t *rt = (void *) node->runtime_data;
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
vnet_hw_interface_t *hi;
u32 sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_TX];
u32 session_index = rt->cached_session_index;
if (PREDICT_FALSE (rt->cached_sw_if_index != sw_if_index))
{
hi = vnet_get_sup_hw_interface (rt->vnet_main, sw_if_index);
session_index = rt->cached_session_index = hi->dev_instance;
rt->cached_sw_if_index = sw_if_index;
}
/* Remember mapping index, prefetch the mini counter */
vnet_buffer (b)->l2t.next_index = L2T_ENCAP_NEXT_IP6_LOOKUP;
vnet_buffer (b)->l2t.session_index = session_index;
/* $$$$ prefetch counter... */
}
static inline u32
last_stage (vlib_main_t * vm, vlib_node_runtime_t * node, u32 bi)
{
vlib_buffer_t *b = vlib_get_buffer (vm, bi);
l2t_main_t *lm = &l2t_main;
vlib_node_t *n = vlib_get_node (vm, l2t_encap_node.index);
u32 node_counter_base_index = n->error_heap_index;
vlib_error_main_t *em = &vm->error_main;
l2tpv3_header_t *l2tp;
u32 session_index;
u32 counter_index;
l2t_session_t *s;
ip6_header_t *ip6;
u16 payload_length;
u32 next_index = L2T_ENCAP_NEXT_IP6_LOOKUP;
/* Other-than-output pkt? We're done... */
if (vnet_buffer (b)->l2t.next_index != L2T_ENCAP_NEXT_IP6_LOOKUP)
return vnet_buffer (b)->l2t.next_index;
em->counters[node_counter_base_index + L2T_ENCAP_ERROR_NETWORK_TO_USER] +=
1;
session_index = vnet_buffer (b)->l2t.session_index;
counter_index =
session_index_to_counter_index (session_index,
SESSION_COUNTER_NETWORK_TO_USER);
/* per-mapping byte stats include the ethernet header */
vlib_increment_combined_counter (&lm->counter_main,
os_get_cpu_number (),
counter_index, 1 /* packet_increment */ ,
vlib_buffer_length_in_chain (vm, b));
s = pool_elt_at_index (lm->sessions, session_index);
vnet_buffer (b)->sw_if_index[VLIB_TX] = s->encap_fib_index;
/* Paint on an l2tpv3 hdr */
vlib_buffer_advance (b, -(s->l2tp_hdr_size));
l2tp = vlib_buffer_get_current (b);
l2tp->session_id = s->remote_session_id;
l2tp->cookie = s->remote_cookie;
if (PREDICT_FALSE (s->l2_sublayer_present))
{
l2tp->l2_specific_sublayer = 0;
}
/* Paint on an ip6 header */
vlib_buffer_advance (b, -(sizeof (*ip6)));
ip6 = vlib_buffer_get_current (b);
if (PREDICT_FALSE (!(s->admin_up)))
{
b->error = node->errors[L2T_ENCAP_ERROR_ADMIN_DOWN];
next_index = L2T_ENCAP_NEXT_DROP;
goto done;
}
ip6->ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 (0x6 << 28);
/* calculate ip6 payload length */
payload_length = vlib_buffer_length_in_chain (vm, b);
payload_length -= sizeof (*ip6);
ip6->payload_length = clib_host_to_net_u16 (payload_length);
ip6->protocol = IP_PROTOCOL_L2TP;
ip6->hop_limit = 0xff;
ip6->src_address.as_u64[0] = s->our_address.as_u64[0];
ip6->src_address.as_u64[1] = s->our_address.as_u64[1];
ip6->dst_address.as_u64[0] = s->client_address.as_u64[0];
ip6->dst_address.as_u64[1] = s->client_address.as_u64[1];
done:
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_IS_TRACED))
{
l2t_trace_t *t = vlib_add_trace (vm, node, b, sizeof (*t));
t->is_user_to_network = 0;
t->our_address.as_u64[0] = ip6->src_address.as_u64[0];
t->our_address.as_u64[1] = ip6->src_address.as_u64[1];
t->client_address.as_u64[0] = ip6->dst_address.as_u64[0];
t->client_address.as_u64[1] = ip6->dst_address.as_u64[1];
t->session_index = session_index;
}
return next_index;
}
#include <vnet/pipeline.h>
uword
l2t_encap_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node, vlib_frame_t * frame)
{
return dispatch_pipeline (vm, node, frame);
}
/* *INDENT-OFF* */
VLIB_REGISTER_NODE (l2t_encap_node) = {
.function = l2t_encap_node_fn,
.name = "l2tp-encap",
.vector_size = sizeof (u32),
.format_trace = format_l2t_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.runtime_data_bytes = sizeof (l2tp_encap_runtime_t),
.n_errors = ARRAY_LEN(l2t_encap_error_strings),
.error_strings = l2t_encap_error_strings,
.n_next_nodes = L2T_ENCAP_N_NEXT,
/* add dispositions here */
.next_nodes = {
[L2T_ENCAP_NEXT_IP6_LOOKUP] = "ip6-lookup",
[L2T_ENCAP_NEXT_DROP] = "error-drop",
},
};
/* *INDENT-ON* */
VLIB_NODE_FUNCTION_MULTIARCH (l2t_encap_node, l2t_encap_node_fn);
void
l2tp_encap_init (vlib_main_t * vm)
{
l2tp_encap_runtime_t *rt;
rt = vlib_node_get_runtime_data (vm, l2t_encap_node.index);
rt->vnet_main = vnet_get_main ();
rt->cached_sw_if_index = (u32) ~ 0;
rt->cached_session_index = (u32) ~ 0;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
