2 * ip_vs_proto.c: transport protocol load balancing support for IPVS
4 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
5 * Julian Anastasov <ja@ssi.bg>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #define KMSG_COMPONENT "IPVS"
17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/skbuff.h>
22 #include <linux/gfp.h>
25 #include <net/protocol.h>
28 #include <linux/stat.h>
29 #include <linux/proc_fs.h>
31 #include <net/ip_vs.h>
35 * IPVS protocols can only be registered/unregistered when the ipvs
36 * module is loaded/unloaded, so no lock is needed in accessing the
37 * ipvs protocol table.
40 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
41 #define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
43 static struct ip_vs_protocol
*ip_vs_proto_table
[IP_VS_PROTO_TAB_SIZE
];
47 * register an ipvs protocol
49 static int __used __init
register_ip_vs_protocol(struct ip_vs_protocol
*pp
)
51 unsigned hash
= IP_VS_PROTO_HASH(pp
->protocol
);
53 pp
->next
= ip_vs_proto_table
[hash
];
54 ip_vs_proto_table
[hash
] = pp
;
62 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP) || \
63 defined(CONFIG_IP_VS_PROTO_SCTP) || defined(CONFIG_IP_VS_PROTO_AH) || \
64 defined(CONFIG_IP_VS_PROTO_ESP)
66 * register an ipvs protocols netns related data
69 register_ip_vs_proto_netns(struct net
*net
, struct ip_vs_protocol
*pp
)
71 struct netns_ipvs
*ipvs
= net_ipvs(net
);
72 unsigned hash
= IP_VS_PROTO_HASH(pp
->protocol
);
73 struct ip_vs_proto_data
*pd
=
74 kzalloc(sizeof(struct ip_vs_proto_data
), GFP_ATOMIC
);
79 pd
->pp
= pp
; /* For speed issues */
80 pd
->next
= ipvs
->proto_data_table
[hash
];
81 ipvs
->proto_data_table
[hash
] = pd
;
82 atomic_set(&pd
->appcnt
, 0); /* Init app counter */
84 if (pp
->init_netns
!= NULL
)
85 pp
->init_netns(net
, pd
);
92 * unregister an ipvs protocol
94 static int unregister_ip_vs_protocol(struct ip_vs_protocol
*pp
)
96 struct ip_vs_protocol
**pp_p
;
97 unsigned hash
= IP_VS_PROTO_HASH(pp
->protocol
);
99 pp_p
= &ip_vs_proto_table
[hash
];
100 for (; *pp_p
; pp_p
= &(*pp_p
)->next
) {
103 if (pp
->exit
!= NULL
)
113 * unregister an ipvs protocols netns data
116 unregister_ip_vs_proto_netns(struct net
*net
, struct ip_vs_proto_data
*pd
)
118 struct netns_ipvs
*ipvs
= net_ipvs(net
);
119 struct ip_vs_proto_data
**pd_p
;
120 unsigned hash
= IP_VS_PROTO_HASH(pd
->pp
->protocol
);
122 pd_p
= &ipvs
->proto_data_table
[hash
];
123 for (; *pd_p
; pd_p
= &(*pd_p
)->next
) {
126 if (pd
->pp
->exit_netns
!= NULL
)
127 pd
->pp
->exit_netns(net
, pd
);
137 * get ip_vs_protocol object by its proto.
139 struct ip_vs_protocol
* ip_vs_proto_get(unsigned short proto
)
141 struct ip_vs_protocol
*pp
;
142 unsigned hash
= IP_VS_PROTO_HASH(proto
);
144 for (pp
= ip_vs_proto_table
[hash
]; pp
; pp
= pp
->next
) {
145 if (pp
->protocol
== proto
)
151 EXPORT_SYMBOL(ip_vs_proto_get
);
154 * get ip_vs_protocol object data by netns and proto
156 struct ip_vs_proto_data
*
157 __ipvs_proto_data_get(struct netns_ipvs
*ipvs
, unsigned short proto
)
159 struct ip_vs_proto_data
*pd
;
160 unsigned hash
= IP_VS_PROTO_HASH(proto
);
162 for (pd
= ipvs
->proto_data_table
[hash
]; pd
; pd
= pd
->next
) {
163 if (pd
->pp
->protocol
== proto
)
170 struct ip_vs_proto_data
*
171 ip_vs_proto_data_get(struct net
*net
, unsigned short proto
)
173 struct netns_ipvs
*ipvs
= net_ipvs(net
);
175 return __ipvs_proto_data_get(ipvs
, proto
);
177 EXPORT_SYMBOL(ip_vs_proto_data_get
);
180 * Propagate event for state change to all protocols
182 void ip_vs_protocol_timeout_change(struct netns_ipvs
*ipvs
, int flags
)
184 struct ip_vs_proto_data
*pd
;
187 for (i
= 0; i
< IP_VS_PROTO_TAB_SIZE
; i
++) {
188 for (pd
= ipvs
->proto_data_table
[i
]; pd
; pd
= pd
->next
) {
189 if (pd
->pp
->timeout_change
)
190 pd
->pp
->timeout_change(pd
, flags
);
197 ip_vs_create_timeout_table(int *table
, int size
)
199 return kmemdup(table
, size
, GFP_ATOMIC
);
204 * Set timeout value for state specified by name
207 ip_vs_set_state_timeout(int *table
, int num
, const char *const *names
,
208 const char *name
, int to
)
212 if (!table
|| !name
|| !to
)
215 for (i
= 0; i
< num
; i
++) {
216 if (strcmp(names
[i
], name
))
225 const char * ip_vs_state_name(__u16 proto
, int state
)
227 struct ip_vs_protocol
*pp
= ip_vs_proto_get(proto
);
229 if (pp
== NULL
|| pp
->state_name
== NULL
)
230 return (IPPROTO_IP
== proto
) ? "NONE" : "ERR!";
231 return pp
->state_name(state
);
236 ip_vs_tcpudp_debug_packet_v4(struct ip_vs_protocol
*pp
,
237 const struct sk_buff
*skb
,
242 struct iphdr _iph
, *ih
;
244 ih
= skb_header_pointer(skb
, offset
, sizeof(_iph
), &_iph
);
246 sprintf(buf
, "TRUNCATED");
247 else if (ih
->frag_off
& htons(IP_OFFSET
))
248 sprintf(buf
, "%pI4->%pI4 frag", &ih
->saddr
, &ih
->daddr
);
250 __be16 _ports
[2], *pptr
;
252 pptr
= skb_header_pointer(skb
, offset
+ ih
->ihl
*4,
253 sizeof(_ports
), _ports
);
255 sprintf(buf
, "TRUNCATED %pI4->%pI4",
256 &ih
->saddr
, &ih
->daddr
);
258 sprintf(buf
, "%pI4:%u->%pI4:%u",
259 &ih
->saddr
, ntohs(pptr
[0]),
260 &ih
->daddr
, ntohs(pptr
[1]));
263 pr_debug("%s: %s %s\n", msg
, pp
->name
, buf
);
266 #ifdef CONFIG_IP_VS_IPV6
268 ip_vs_tcpudp_debug_packet_v6(struct ip_vs_protocol
*pp
,
269 const struct sk_buff
*skb
,
274 struct ipv6hdr _iph
, *ih
;
276 ih
= skb_header_pointer(skb
, offset
, sizeof(_iph
), &_iph
);
278 sprintf(buf
, "TRUNCATED");
279 else if (ih
->nexthdr
== IPPROTO_FRAGMENT
)
280 sprintf(buf
, "%pI6->%pI6 frag", &ih
->saddr
, &ih
->daddr
);
282 __be16 _ports
[2], *pptr
;
284 pptr
= skb_header_pointer(skb
, offset
+ sizeof(struct ipv6hdr
),
285 sizeof(_ports
), _ports
);
287 sprintf(buf
, "TRUNCATED %pI6->%pI6",
288 &ih
->saddr
, &ih
->daddr
);
290 sprintf(buf
, "%pI6:%u->%pI6:%u",
291 &ih
->saddr
, ntohs(pptr
[0]),
292 &ih
->daddr
, ntohs(pptr
[1]));
295 pr_debug("%s: %s %s\n", msg
, pp
->name
, buf
);
301 ip_vs_tcpudp_debug_packet(int af
, struct ip_vs_protocol
*pp
,
302 const struct sk_buff
*skb
,
306 #ifdef CONFIG_IP_VS_IPV6
308 ip_vs_tcpudp_debug_packet_v6(pp
, skb
, offset
, msg
);
311 ip_vs_tcpudp_debug_packet_v4(pp
, skb
, offset
, msg
);
315 * per network name-space init
317 int __net_init
ip_vs_protocol_net_init(struct net
*net
)
319 #ifdef CONFIG_IP_VS_PROTO_TCP
320 register_ip_vs_proto_netns(net
, &ip_vs_protocol_tcp
);
322 #ifdef CONFIG_IP_VS_PROTO_UDP
323 register_ip_vs_proto_netns(net
, &ip_vs_protocol_udp
);
325 #ifdef CONFIG_IP_VS_PROTO_SCTP
326 register_ip_vs_proto_netns(net
, &ip_vs_protocol_sctp
);
328 #ifdef CONFIG_IP_VS_PROTO_AH
329 register_ip_vs_proto_netns(net
, &ip_vs_protocol_ah
);
331 #ifdef CONFIG_IP_VS_PROTO_ESP
332 register_ip_vs_proto_netns(net
, &ip_vs_protocol_esp
);
337 void __net_exit
ip_vs_protocol_net_cleanup(struct net
*net
)
339 struct netns_ipvs
*ipvs
= net_ipvs(net
);
340 struct ip_vs_proto_data
*pd
;
343 /* unregister all the ipvs proto data for this netns */
344 for (i
= 0; i
< IP_VS_PROTO_TAB_SIZE
; i
++) {
345 while ((pd
= ipvs
->proto_data_table
[i
]) != NULL
)
346 unregister_ip_vs_proto_netns(net
, pd
);
350 int __init
ip_vs_protocol_init(void)
353 #define REGISTER_PROTOCOL(p) \
355 register_ip_vs_protocol(p); \
356 strcat(protocols, ", "); \
357 strcat(protocols, (p)->name); \
362 #ifdef CONFIG_IP_VS_PROTO_TCP
363 REGISTER_PROTOCOL(&ip_vs_protocol_tcp
);
365 #ifdef CONFIG_IP_VS_PROTO_UDP
366 REGISTER_PROTOCOL(&ip_vs_protocol_udp
);
368 #ifdef CONFIG_IP_VS_PROTO_SCTP
369 REGISTER_PROTOCOL(&ip_vs_protocol_sctp
);
371 #ifdef CONFIG_IP_VS_PROTO_AH
372 REGISTER_PROTOCOL(&ip_vs_protocol_ah
);
374 #ifdef CONFIG_IP_VS_PROTO_ESP
375 REGISTER_PROTOCOL(&ip_vs_protocol_esp
);
377 pr_info("Registered protocols (%s)\n", &protocols
[2]);
383 void ip_vs_protocol_cleanup(void)
385 struct ip_vs_protocol
*pp
;
388 /* unregister all the ipvs protocols */
389 for (i
= 0; i
< IP_VS_PROTO_TAB_SIZE
; i
++) {
390 while ((pp
= ip_vs_proto_table
[i
]) != NULL
)
391 unregister_ip_vs_protocol(pp
);