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 <asm/system.h>
29 #include <linux/stat.h>
30 #include <linux/proc_fs.h>
32 #include <net/ip_vs.h>
36 * IPVS protocols can only be registered/unregistered when the ipvs
37 * module is loaded/unloaded, so no lock is needed in accessing the
38 * ipvs protocol table.
41 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
42 #define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
44 static struct ip_vs_protocol
*ip_vs_proto_table
[IP_VS_PROTO_TAB_SIZE
];
48 * register an ipvs protocol
50 static int __used __init
register_ip_vs_protocol(struct ip_vs_protocol
*pp
)
52 unsigned hash
= IP_VS_PROTO_HASH(pp
->protocol
);
54 pp
->next
= ip_vs_proto_table
[hash
];
55 ip_vs_proto_table
[hash
] = pp
;
65 * unregister an ipvs protocol
67 static int unregister_ip_vs_protocol(struct ip_vs_protocol
*pp
)
69 struct ip_vs_protocol
**pp_p
;
70 unsigned hash
= IP_VS_PROTO_HASH(pp
->protocol
);
72 pp_p
= &ip_vs_proto_table
[hash
];
73 for (; *pp_p
; pp_p
= &(*pp_p
)->next
) {
87 * get ip_vs_protocol object by its proto.
89 struct ip_vs_protocol
* ip_vs_proto_get(unsigned short proto
)
91 struct ip_vs_protocol
*pp
;
92 unsigned hash
= IP_VS_PROTO_HASH(proto
);
94 for (pp
= ip_vs_proto_table
[hash
]; pp
; pp
= pp
->next
) {
95 if (pp
->protocol
== proto
)
101 EXPORT_SYMBOL(ip_vs_proto_get
);
105 * Propagate event for state change to all protocols
107 void ip_vs_protocol_timeout_change(int flags
)
109 struct ip_vs_protocol
*pp
;
112 for (i
= 0; i
< IP_VS_PROTO_TAB_SIZE
; i
++) {
113 for (pp
= ip_vs_proto_table
[i
]; pp
; pp
= pp
->next
) {
114 if (pp
->timeout_change
)
115 pp
->timeout_change(pp
, flags
);
122 ip_vs_create_timeout_table(int *table
, int size
)
124 return kmemdup(table
, size
, GFP_ATOMIC
);
129 * Set timeout value for state specified by name
132 ip_vs_set_state_timeout(int *table
, int num
, const char *const *names
,
133 const char *name
, int to
)
137 if (!table
|| !name
|| !to
)
140 for (i
= 0; i
< num
; i
++) {
141 if (strcmp(names
[i
], name
))
150 const char * ip_vs_state_name(__u16 proto
, int state
)
152 struct ip_vs_protocol
*pp
= ip_vs_proto_get(proto
);
154 if (pp
== NULL
|| pp
->state_name
== NULL
)
155 return (IPPROTO_IP
== proto
) ? "NONE" : "ERR!";
156 return pp
->state_name(state
);
161 ip_vs_tcpudp_debug_packet_v4(struct ip_vs_protocol
*pp
,
162 const struct sk_buff
*skb
,
167 struct iphdr _iph
, *ih
;
169 ih
= skb_header_pointer(skb
, offset
, sizeof(_iph
), &_iph
);
171 sprintf(buf
, "TRUNCATED");
172 else if (ih
->frag_off
& htons(IP_OFFSET
))
173 sprintf(buf
, "%pI4->%pI4 frag", &ih
->saddr
, &ih
->daddr
);
175 __be16 _ports
[2], *pptr
177 pptr
= skb_header_pointer(skb
, offset
+ ih
->ihl
*4,
178 sizeof(_ports
), _ports
);
180 sprintf(buf
, "TRUNCATED %pI4->%pI4",
181 &ih
->saddr
, &ih
->daddr
);
183 sprintf(buf
, "%pI4:%u->%pI4:%u",
184 &ih
->saddr
, ntohs(pptr
[0]),
185 &ih
->daddr
, ntohs(pptr
[1]));
188 pr_debug("%s: %s %s\n", msg
, pp
->name
, 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
, "TRUNCATED");
204 else if (ih
->nexthdr
== IPPROTO_FRAGMENT
)
205 sprintf(buf
, "%pI6->%pI6 frag", &ih
->saddr
, &ih
->daddr
);
207 __be16 _ports
[2], *pptr
;
209 pptr
= skb_header_pointer(skb
, offset
+ sizeof(struct ipv6hdr
),
210 sizeof(_ports
), _ports
);
212 sprintf(buf
, "TRUNCATED %pI6->%pI6",
213 &ih
->saddr
, &ih
->daddr
);
215 sprintf(buf
, "%pI6:%u->%pI6:%u",
216 &ih
->saddr
, ntohs(pptr
[0]),
217 &ih
->daddr
, ntohs(pptr
[1]));
220 pr_debug("%s: %s %s\n", msg
, pp
->name
, buf
);
226 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol
*pp
,
227 const struct sk_buff
*skb
,
231 #ifdef CONFIG_IP_VS_IPV6
232 if (skb
->protocol
== htons(ETH_P_IPV6
))
233 ip_vs_tcpudp_debug_packet_v6(pp
, skb
, offset
, msg
);
236 ip_vs_tcpudp_debug_packet_v4(pp
, skb
, offset
, msg
);
240 int __init
ip_vs_protocol_init(void)
243 #define REGISTER_PROTOCOL(p) \
245 register_ip_vs_protocol(p); \
246 strcat(protocols, ", "); \
247 strcat(protocols, (p)->name); \
252 #ifdef CONFIG_IP_VS_PROTO_TCP
253 REGISTER_PROTOCOL(&ip_vs_protocol_tcp
);
255 #ifdef CONFIG_IP_VS_PROTO_UDP
256 REGISTER_PROTOCOL(&ip_vs_protocol_udp
);
258 #ifdef CONFIG_IP_VS_PROTO_SCTP
259 REGISTER_PROTOCOL(&ip_vs_protocol_sctp
);
261 #ifdef CONFIG_IP_VS_PROTO_AH
262 REGISTER_PROTOCOL(&ip_vs_protocol_ah
);
264 #ifdef CONFIG_IP_VS_PROTO_ESP
265 REGISTER_PROTOCOL(&ip_vs_protocol_esp
);
267 pr_info("Registered protocols (%s)\n", &protocols
[2]);
273 void ip_vs_protocol_cleanup(void)
275 struct ip_vs_protocol
*pp
;
278 /* unregister all the ipvs protocols */
279 for (i
= 0; i
< IP_VS_PROTO_TAB_SIZE
; i
++) {
280 while ((pp
= ip_vs_proto_table
[i
]) != NULL
)
281 unregister_ip_vs_protocol(pp
);