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20#define KMSG_COMPONENT "IPVS"
21#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
22
23#include <linux/module.h>
24#include <linux/spinlock.h>
25#include <linux/interrupt.h>
26#include <asm/string.h>
27#include <linux/kmod.h>
28#include <linux/sysctl.h>
29
30#include <net/ip_vs.h>
31
32EXPORT_SYMBOL(ip_vs_scheduler_err);
33
34
35
36static LIST_HEAD(ip_vs_schedulers);
37
38
39static DEFINE_SPINLOCK(ip_vs_sched_lock);
40
41
42
43
44
45int ip_vs_bind_scheduler(struct ip_vs_service *svc,
46 struct ip_vs_scheduler *scheduler)
47{
48 int ret;
49
50 svc->scheduler = scheduler;
51
52 if (scheduler->init_service) {
53 ret = scheduler->init_service(svc);
54 if (ret) {
55 pr_err("%s(): init error\n", __func__);
56 return ret;
57 }
58 }
59
60 return 0;
61}
62
63
64
65
66
67int ip_vs_unbind_scheduler(struct ip_vs_service *svc)
68{
69 struct ip_vs_scheduler *sched = svc->scheduler;
70
71 if (!sched)
72 return 0;
73
74 if (sched->done_service) {
75 if (sched->done_service(svc) != 0) {
76 pr_err("%s(): done error\n", __func__);
77 return -EINVAL;
78 }
79 }
80
81 svc->scheduler = NULL;
82 return 0;
83}
84
85
86
87
88
89static struct ip_vs_scheduler *ip_vs_sched_getbyname(const char *sched_name)
90{
91 struct ip_vs_scheduler *sched;
92
93 IP_VS_DBG(2, "%s(): sched_name \"%s\"\n", __func__, sched_name);
94
95 spin_lock_bh(&ip_vs_sched_lock);
96
97 list_for_each_entry(sched, &ip_vs_schedulers, n_list) {
98
99
100
101 if (sched->module && !try_module_get(sched->module)) {
102
103
104
105 continue;
106 }
107 if (strcmp(sched_name, sched->name)==0) {
108
109 spin_unlock_bh(&ip_vs_sched_lock);
110 return sched;
111 }
112 if (sched->module)
113 module_put(sched->module);
114 }
115
116 spin_unlock_bh(&ip_vs_sched_lock);
117 return NULL;
118}
119
120
121
122
123
124struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name)
125{
126 struct ip_vs_scheduler *sched;
127
128
129
130
131 sched = ip_vs_sched_getbyname(sched_name);
132
133
134
135
136 if (sched == NULL) {
137 request_module("ip_vs_%s", sched_name);
138 sched = ip_vs_sched_getbyname(sched_name);
139 }
140
141 return sched;
142}
143
144void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler)
145{
146 if (scheduler && scheduler->module)
147 module_put(scheduler->module);
148}
149
150
151
152
153
154void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg)
155{
156 if (svc->fwmark) {
157 IP_VS_ERR_RL("%s: FWM %u 0x%08X - %s\n",
158 svc->scheduler->name, svc->fwmark,
159 svc->fwmark, msg);
160#ifdef CONFIG_IP_VS_IPV6
161 } else if (svc->af == AF_INET6) {
162 IP_VS_ERR_RL("%s: %s [%pI6]:%d - %s\n",
163 svc->scheduler->name,
164 ip_vs_proto_name(svc->protocol),
165 &svc->addr.in6, ntohs(svc->port), msg);
166#endif
167 } else {
168 IP_VS_ERR_RL("%s: %s %pI4:%d - %s\n",
169 svc->scheduler->name,
170 ip_vs_proto_name(svc->protocol),
171 &svc->addr.ip, ntohs(svc->port), msg);
172 }
173}
174
175
176
177
178int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
179{
180 struct ip_vs_scheduler *sched;
181
182 if (!scheduler) {
183 pr_err("%s(): NULL arg\n", __func__);
184 return -EINVAL;
185 }
186
187 if (!scheduler->name) {
188 pr_err("%s(): NULL scheduler_name\n", __func__);
189 return -EINVAL;
190 }
191
192
193 ip_vs_use_count_inc();
194
195 spin_lock_bh(&ip_vs_sched_lock);
196
197 if (!list_empty(&scheduler->n_list)) {
198 spin_unlock_bh(&ip_vs_sched_lock);
199 ip_vs_use_count_dec();
200 pr_err("%s(): [%s] scheduler already linked\n",
201 __func__, scheduler->name);
202 return -EINVAL;
203 }
204
205
206
207
208
209 list_for_each_entry(sched, &ip_vs_schedulers, n_list) {
210 if (strcmp(scheduler->name, sched->name) == 0) {
211 spin_unlock_bh(&ip_vs_sched_lock);
212 ip_vs_use_count_dec();
213 pr_err("%s(): [%s] scheduler already existed "
214 "in the system\n", __func__, scheduler->name);
215 return -EINVAL;
216 }
217 }
218
219
220
221 list_add(&scheduler->n_list, &ip_vs_schedulers);
222 spin_unlock_bh(&ip_vs_sched_lock);
223
224 pr_info("[%s] scheduler registered.\n", scheduler->name);
225
226 return 0;
227}
228
229
230
231
232
233int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
234{
235 if (!scheduler) {
236 pr_err("%s(): NULL arg\n", __func__);
237 return -EINVAL;
238 }
239
240 spin_lock_bh(&ip_vs_sched_lock);
241 if (list_empty(&scheduler->n_list)) {
242 spin_unlock_bh(&ip_vs_sched_lock);
243 pr_err("%s(): [%s] scheduler is not in the list. failed\n",
244 __func__, scheduler->name);
245 return -EINVAL;
246 }
247
248
249
250
251 list_del(&scheduler->n_list);
252 spin_unlock_bh(&ip_vs_sched_lock);
253
254
255 ip_vs_use_count_dec();
256
257 pr_info("[%s] scheduler unregistered.\n", scheduler->name);
258
259 return 0;
260}
261