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>
24 #include <net/protocol.h>
27 #include <asm/system.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
;
64 * unregister an ipvs protocol
66 static int unregister_ip_vs_protocol(struct ip_vs_protocol
*pp
)
68 struct ip_vs_protocol
**pp_p
;
69 unsigned hash
= IP_VS_PROTO_HASH(pp
->protocol
);
71 pp_p
= &ip_vs_proto_table
[hash
];
72 for (; *pp_p
; pp_p
= &(*pp_p
)->next
) {
86 * get ip_vs_protocol object by its proto.
88 struct ip_vs_protocol
* ip_vs_proto_get(unsigned short proto
)
90 struct ip_vs_protocol
*pp
;
91 unsigned hash
= IP_VS_PROTO_HASH(proto
);
93 for (pp
= ip_vs_proto_table
[hash
]; pp
; pp
= pp
->next
) {
94 if (pp
->protocol
== proto
)
103 * Propagate event for state change to all protocols
105 void ip_vs_protocol_timeout_change(int flags
)
107 struct ip_vs_protocol
*pp
;
110 for (i
= 0; i
< IP_VS_PROTO_TAB_SIZE
; i
++) {
111 for (pp
= ip_vs_proto_table
[i
]; pp
; pp
= pp
->next
) {
112 if (pp
->timeout_change
)
113 pp
->timeout_change(pp
, flags
);
120 ip_vs_create_timeout_table(int *table
, int size
)
122 return kmemdup(table
, size
, GFP_ATOMIC
);
127 * Set timeout value for state specified by name
130 ip_vs_set_state_timeout(int *table
, int num
, const char *const *names
,
131 const char *name
, int to
)
135 if (!table
|| !name
|| !to
)
138 for (i
= 0; i
< num
; i
++) {
139 if (strcmp(names
[i
], name
))
148 const char * ip_vs_state_name(__u16 proto
, int state
)
150 struct ip_vs_protocol
*pp
= ip_vs_proto_get(proto
);
152 if (pp
== NULL
|| pp
->state_name
== NULL
)
153 return (IPPROTO_IP
== proto
) ? "NONE" : "ERR!";
154 return pp
->state_name(state
);
159 ip_vs_tcpudp_debug_packet_v4(struct ip_vs_protocol
*pp
,
160 const struct sk_buff
*skb
,
165 struct iphdr _iph
, *ih
;
167 ih
= skb_header_pointer(skb
, offset
, sizeof(_iph
), &_iph
);
169 sprintf(buf
, "%s TRUNCATED", pp
->name
);
170 else if (ih
->frag_off
& htons(IP_OFFSET
))
171 sprintf(buf
, "%s %pI4->%pI4 frag",
172 pp
->name
, &ih
->saddr
, &ih
->daddr
);
174 __be16 _ports
[2], *pptr
176 pptr
= skb_header_pointer(skb
, offset
+ ih
->ihl
*4,
177 sizeof(_ports
), _ports
);
179 sprintf(buf
, "%s TRUNCATED %pI4->%pI4",
180 pp
->name
, &ih
->saddr
, &ih
->daddr
);
182 sprintf(buf
, "%s %pI4:%u->%pI4:%u",
184 &ih
->saddr
, ntohs(pptr
[0]),
185 &ih
->daddr
, ntohs(pptr
[1]));
188 pr_debug("%s: %s\n", msg
, buf
);
191 #ifdef CONFIG_IP_VS_IPV6
193 ip_vs_tcpudp_debug_packet_v6(struct ip_vs_protocol
*pp
,
194 const struct sk_buff
*skb
,
199 struct ipv6hdr _iph
, *ih
;
201 ih
= skb_header_pointer(skb
, offset
, sizeof(_iph
), &_iph
);
203 sprintf(buf
, "%s TRUNCATED", pp
->name
);
204 else if (ih
->nexthdr
== IPPROTO_FRAGMENT
)
205 sprintf(buf
, "%s %pI6->%pI6 frag",
206 pp
->name
, &ih
->saddr
, &ih
->daddr
);
208 __be16 _ports
[2], *pptr
;
210 pptr
= skb_header_pointer(skb
, offset
+ sizeof(struct ipv6hdr
),
211 sizeof(_ports
), _ports
);
213 sprintf(buf
, "%s TRUNCATED %pI6->%pI6",
214 pp
->name
, &ih
->saddr
, &ih
->daddr
);
216 sprintf(buf
, "%s %pI6:%u->%pI6:%u",
218 &ih
->saddr
, ntohs(pptr
[0]),
219 &ih
->daddr
, ntohs(pptr
[1]));
222 pr_debug("%s: %s\n", msg
, buf
);
228 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol
*pp
,
229 const struct sk_buff
*skb
,
233 #ifdef CONFIG_IP_VS_IPV6
234 if (skb
->protocol
== htons(ETH_P_IPV6
))
235 ip_vs_tcpudp_debug_packet_v6(pp
, skb
, offset
, msg
);
238 ip_vs_tcpudp_debug_packet_v4(pp
, skb
, offset
, msg
);
242 int __init
ip_vs_protocol_init(void)
245 #define REGISTER_PROTOCOL(p) \
247 register_ip_vs_protocol(p); \
248 strcat(protocols, ", "); \
249 strcat(protocols, (p)->name); \
254 #ifdef CONFIG_IP_VS_PROTO_TCP
255 REGISTER_PROTOCOL(&ip_vs_protocol_tcp
);
257 #ifdef CONFIG_IP_VS_PROTO_UDP
258 REGISTER_PROTOCOL(&ip_vs_protocol_udp
);
260 #ifdef CONFIG_IP_VS_PROTO_AH
261 REGISTER_PROTOCOL(&ip_vs_protocol_ah
);
263 #ifdef CONFIG_IP_VS_PROTO_ESP
264 REGISTER_PROTOCOL(&ip_vs_protocol_esp
);
266 pr_info("Registered protocols (%s)\n", &protocols
[2]);
272 void ip_vs_protocol_cleanup(void)
274 struct ip_vs_protocol
*pp
;
277 /* unregister all the ipvs protocols */
278 for (i
= 0; i
< IP_VS_PROTO_TAB_SIZE
; i
++) {
279 while ((pp
= ip_vs_proto_table
[i
]) != NULL
)
280 unregister_ip_vs_protocol(pp
);