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
239
240
241
242
243
244
245
246
247
248
249
|
#include <zebra.h>
#include "lib/stream.h"
#include "lib/vty.h"
#include "lib/mpls.h"
#include "lib/if.h"
#include "lib/table.h"
#include "ospfd/ospfd.h"
#include "ospfd/ospf_route.h"
#include "ospfd/ospf_spf.h"
#include "ospfd/ospf_flood.h"
#include "ospfd/ospf_lsa.h"
#include "ospfd/ospf_lsdb.h"
#include "ospfd/ospf_interface.h"
#include "ospfd/ospf_sr.h"
#include "common.h"
struct event_loop *master;
struct zebra_privs_t ospfd_privs;
struct ospf_topology *test_find_topology(const char *name)
{
if (strmatch(name, "topo1"))
return &topo1;
else if (strmatch(name, "topo2"))
return &topo2;
else if (strmatch(name, "topo3"))
return &topo3;
else if (strmatch(name, "topo4"))
return &topo4;
else if (strmatch(name, "topo5"))
return &topo5;
return NULL;
}
int sort_paths(const void **path1, const void **path2)
{
const struct ospf_path *p1 = *path1;
const struct ospf_path *p2 = *path2;
return (p1->nexthop.s_addr - p2->nexthop.s_addr);
}
void print_route_table(struct vty *vty, struct route_table *rt)
{
struct route_node *rn;
struct ospf_route * or ;
struct listnode *pnode;
struct ospf_path *path;
struct mpls_label_stack *label_stack;
char buf[MPLS_LABEL_STRLEN];
for (rn = route_top(rt); rn; rn = route_next(rn)) {
if ((or = rn->info) == NULL)
continue;
vty_out(vty, "N %-18pFX %-15pI4 %d\n", &rn->p,
& or->u.std.area_id, or->cost);
list_sort(or->paths, sort_paths);
for (ALL_LIST_ELEMENTS_RO(or->paths, pnode, path)) {
if (path->nexthop.s_addr == 0)
continue;
vty_out(vty, " -> %pI4 with adv router %pI4",
&path->nexthop, &path->adv_router);
if (path->srni.backup_label_stack) {
label_stack = path->srni.backup_label_stack;
mpls_label2str(label_stack->num_labels,
label_stack->label, buf,
MPLS_LABEL_STRLEN,
ZEBRA_LSP_NONE, true);
vty_out(vty, " and backup path %s", buf);
}
vty_out(vty, "\n");
}
}
}
struct ospf_test_node *test_find_node(struct ospf_topology *topology,
const char *hostname)
{
for (int i = 0; topology->nodes[i].hostname[0]; i++)
if (strmatch(hostname, topology->nodes[i].hostname))
return &topology->nodes[i];
return NULL;
}
static void inject_router_lsa(struct vty *vty, struct ospf *ospf,
struct ospf_topology *topology,
struct ospf_test_node *root,
struct ospf_test_node *tnode)
{
struct ospf_area *area;
struct in_addr router_id;
struct in_addr adj_router_id;
struct prefix_ipv4 prefix;
struct in_addr data;
struct stream *s;
struct lsa_header *lsah;
struct ospf_lsa *new;
int length;
unsigned long putp;
uint16_t link_count;
struct ospf_test_node *tfound_adj_node;
struct ospf_test_adj *tadj;
bool is_self_lsa = false;
area = ospf->backbone;
inet_aton(tnode->router_id, &router_id);
if (strncmp(root->router_id, tnode->router_id, 256) == 0)
is_self_lsa = true;
s = stream_new(OSPF_MAX_LSA_SIZE);
lsa_header_set(s, LSA_OPTIONS_GET(area) | LSA_OPTIONS_NSSA_GET(area),
OSPF_ROUTER_LSA, router_id, router_id);
stream_putc(s, router_lsa_flags(area));
stream_putc(s, 0);
putp = stream_get_endp(s);
stream_putw(s, 0);
for (link_count = 0; tnode->adjacencies[link_count].hostname[0];
link_count++) {
tadj = &tnode->adjacencies[link_count];
tfound_adj_node = test_find_node(topology, tadj->hostname);
str2prefix_ipv4(tnode->adjacencies[link_count].network,
&prefix);
inet_aton(tfound_adj_node->router_id, &adj_router_id);
data.s_addr = prefix.prefix.s_addr;
link_info_set(&s, adj_router_id, data,
LSA_LINK_TYPE_POINTOPOINT, 0, tadj->metric);
masklen2ip(prefix.prefixlen, &data);
link_info_set(&s, prefix.prefix, data, LSA_LINK_TYPE_STUB, 0,
tadj->metric);
}
/* Don't forget the node itself (just a stub) */
str2prefix_ipv4(tnode->router_id, &prefix);
data.s_addr = 0xffffffff;
link_info_set(&s, prefix.prefix, data, LSA_LINK_TYPE_STUB, 0, 0);
/* Take twice the link count (for P2P and stub) plus the local stub */
stream_putw_at(s, putp, (2 * link_count) + 1);
length = stream_get_endp(s);
lsah = (struct lsa_header *)STREAM_DATA(s);
lsah->length = htons(length);
new = ospf_lsa_new_and_data(length);
new->area = area;
new->vrf_id = area->ospf->vrf_id;
if (is_self_lsa)
SET_FLAG(new->flags, OSPF_LSA_SELF | OSPF_LSA_SELF_CHECKED);
memcpy(new->data, lsah, length);
stream_free(s);
ospf_lsdb_add(area->lsdb, new);
if (is_self_lsa) {
ospf_lsa_unlock(&area->router_lsa_self);
area->router_lsa_self = ospf_lsa_lock(new);
}
}
static void inject_sr_db_entry(struct vty *vty, struct ospf_test_node *tnode,
struct ospf_topology *topology)
{
struct ospf_test_node *tfound_adj_node;
struct ospf_test_adj *tadj;
struct in_addr router_id;
struct in_addr remote_id;
struct sr_node *srn;
struct sr_prefix *srp;
struct sr_link *srl;
int link_count;
inet_aton(tnode->router_id, &router_id);
srn = ospf_sr_node_create(&router_id);
srn->srgb.range_size = 8000;
srn->srgb.lower_bound = 16000;
srn->msd = 16;
srn->srlb.range_size = 1000;
srn->srlb.lower_bound = 15000;
/* Prefix SID */
srp = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_prefix));
srp->adv_router = router_id;
srp->sid = tnode->label;
srp->srn = srn;
listnode_add(srn->ext_prefix, srp);
/* Adjacency SIDs for all adjacencies */
for (link_count = 0; tnode->adjacencies[link_count].hostname[0];
link_count++) {
tadj = &tnode->adjacencies[link_count];
tfound_adj_node = test_find_node(topology, tadj->hostname);
srl = XCALLOC(MTYPE_OSPF_SR_PARAMS, sizeof(struct sr_link));
srl->adv_router = router_id;
inet_aton(tfound_adj_node->router_id, &remote_id);
srl->remote_id = remote_id;
srl->type = ADJ_SID;
srl->sid[0] = srn->srlb.lower_bound + tadj->label;
srl->srn = srn;
listnode_add(srn->ext_link, srl);
}
}
int topology_load(struct vty *vty, struct ospf_topology *topology,
struct ospf_test_node *root, struct ospf *ospf)
{
struct ospf_test_node *tnode;
for (int i = 0; topology->nodes[i].hostname[0]; i++) {
tnode = &topology->nodes[i];
/* Inject a router LSA for each node, used for SPF */
inject_router_lsa(vty, ospf, topology, root, tnode);
/*
* SR information could also be inected via LSAs, but directly
* filling the SR DB with labels is just easier.
*/
inject_sr_db_entry(vty, tnode, topology);
}
return 0;
}
|
