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
|
/* SPDX-License-Identifier: Apache-2.0
* Copyright(c) 2022 Cisco Systems, Inc.
*/
#include <vnet/fib/ip6_fib.h>
#include <vnet/dpo/load_balance.h>
#include <vnet/l2/feat_bitmap.h>
#include <vnet/fib/fib_table.h>
#include <vnet/srv6/sr.h>
#include <vnet/srv6/sr_pt.h>
/**
* @brief PT node trace
*/
typedef struct
{
u32 iface;
u16 id;
u8 load;
timestamp_64_t t64;
u8 tts_template;
u8 tts;
u8 behavior;
} pt_trace_t;
static u8 *
format_pt_trace (u8 *s, va_list *args)
{
CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
pt_trace_t *t = va_arg (*args, pt_trace_t *);
switch (t->behavior)
{
case PT_BEHAVIOR_MID:
s = format (
s,
"Behavior Midpoint, outgoing interface %U, outgoing interface id %u, "
"outgoing interface load %u, t64_sec %u, t64_nsec %u, tts_template "
"%u, tts %u",
format_vnet_sw_if_index_name, vnet_get_main (), t->iface, t->id,
t->load, htobe32 (t->t64.sec), htobe32 (t->t64.nsec), t->tts_template,
t->tts);
break;
default:
break;
}
return s;
}
static_always_inline void
pt_midpoint_processing (vlib_main_t *vm, vlib_node_runtime_t *node,
vlib_buffer_t *b0, ip6_header_t *ip0,
sr_pt_iface_t *ls, timestamp_64_t t64)
{
ip6_hop_by_hop_header_t *hbh;
ip6_hop_by_hop_option_t *hbh_opt;
ip6_hop_by_hop_option_pt_t *hbh_opt_pt;
if (ip0->protocol == IP_PROTOCOL_IP6_HOP_BY_HOP_OPTIONS)
{
hbh = (void *) (ip0 + 1);
hbh_opt = (void *) (hbh + 1);
if (hbh_opt->type == IP6_HBH_PT_TYPE)
{
hbh_opt_pt = (void *) (hbh_opt + 1);
clib_memcpy_fast (&hbh_opt_pt->cmd_stack[1],
&hbh_opt_pt->cmd_stack[0], 33);
hbh_opt_pt->cmd_stack[0].oif_oil = htobe16 (ls->id << 4);
hbh_opt_pt->cmd_stack[0].oif_oil |= ls->egress_load;
switch (ls->tts_template)
{
case SR_PT_TTS_TEMPLATE_0:
hbh_opt_pt->cmd_stack[0].tts =
t64.nsec >> SR_PT_TTS_SHIFT_TEMPLATE_0;
break;
case SR_PT_TTS_TEMPLATE_1:
hbh_opt_pt->cmd_stack[0].tts =
t64.nsec >> SR_PT_TTS_SHIFT_TEMPLATE_1;
break;
case SR_PT_TTS_TEMPLATE_2:
hbh_opt_pt->cmd_stack[0].tts =
t64.nsec >> SR_PT_TTS_SHIFT_TEMPLATE_2;
break;
case SR_PT_TTS_TEMPLATE_3:
hbh_opt_pt->cmd_stack[0].tts =
t64.nsec >> SR_PT_TTS_SHIFT_TEMPLATE_0;
break;
default:
break;
}
}
}
return;
}
VLIB_NODE_FN (sr_pt_node)
(vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *from_frame)
{
u32 n_left_from, next_index, *from, *to_next;
from = vlib_frame_vector_args (from_frame);
n_left_from = from_frame->n_vectors;
next_index = node->cached_next_index;
u8 pt_behavior = ~(u8) 0;
sr_pt_iface_t *ls = 0;
while (n_left_from > 0)
{
u32 n_left_to_next;
vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
// Single loop for potentially the last three packets
while (n_left_from > 0 && n_left_to_next > 0)
{
u32 bi0;
u32 iface;
vlib_buffer_t *b0;
u32 next0 = 0;
ethernet_header_t *en0;
ip6_header_t *ip0 = 0;
bi0 = from[0];
to_next[0] = bi0;
from += 1;
to_next += 1;
n_left_from -= 1;
n_left_to_next -= 1;
timestamp_64_t t64;
b0 = vlib_get_buffer (vm, bi0);
iface = vnet_buffer (b0)->sw_if_index[VLIB_TX];
ls = sr_pt_find_iface (iface);
if (ls)
{
en0 = vlib_buffer_get_current (b0);
ip0 = (void *) (en0 + 1);
unix_time_now_nsec_fraction (&t64.sec, &t64.nsec);
pt_midpoint_processing (vm, node, b0, ip0, ls, t64);
pt_behavior = PT_BEHAVIOR_MID;
}
if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
{
pt_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
tr->iface = iface;
tr->id = ls->id;
tr->load = ls->egress_load;
tr->tts_template = ls->tts_template;
tr->t64.sec = t64.sec;
tr->t64.nsec = t64.nsec;
tr->tts = t64.nsec >> 20;
tr->behavior = pt_behavior;
}
vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
n_left_to_next, bi0, next0);
}
vlib_put_next_frame (vm, node, next_index, n_left_to_next);
}
return from_frame->n_vectors;
}
VLIB_REGISTER_NODE (sr_pt_node) = {
.name = "pt",
.vector_size = sizeof (u32),
.format_trace = format_pt_trace,
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = 0,
.n_next_nodes = 1,
.next_nodes = { [0] = "interface-output" },
};
VNET_FEATURE_INIT (sr_pt_node, static) = {
.arc_name = "ip6-output",
.node_name = "pt",
.runs_after = VNET_FEATURES ("ip6-lookup"),
};
|
