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 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/skbuff.h>
21 #include <net/protocol.h>
24 #include <asm/system.h>
25 #include <linux/stat.h>
26 #include <linux/proc_fs.h>
28 #include <net/ip_vs.h>
32 * IPVS protocols can only be registered/unregistered when the ipvs
33 * module is loaded/unloaded, so no lock is needed in accessing the
34 * ipvs protocol table.
37 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
38 #define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
40 static struct ip_vs_protocol *ip_vs_proto_table[IP_VS_PROTO_TAB_SIZE];
44 * register an ipvs protocol
46 static int __used register_ip_vs_protocol(struct ip_vs_protocol *pp)
48 unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
50 pp->next = ip_vs_proto_table[hash];
51 ip_vs_proto_table[hash] = pp;
61 * unregister an ipvs protocol
63 static int unregister_ip_vs_protocol(struct ip_vs_protocol *pp)
65 struct ip_vs_protocol **pp_p;
66 unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
68 pp_p = &ip_vs_proto_table[hash];
69 for (; *pp_p; pp_p = &(*pp_p)->next) {
83 * get ip_vs_protocol object by its proto.
85 struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto)
87 struct ip_vs_protocol *pp;
88 unsigned hash = IP_VS_PROTO_HASH(proto);
90 for (pp = ip_vs_proto_table[hash]; pp; pp = pp->next) {
91 if (pp->protocol == proto)
100 * Propagate event for state change to all protocols
102 void ip_vs_protocol_timeout_change(int flags)
104 struct ip_vs_protocol *pp;
107 for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
108 for (pp = ip_vs_proto_table[i]; pp; pp = pp->next) {
109 if (pp->timeout_change)
110 pp->timeout_change(pp, flags);
117 ip_vs_create_timeout_table(int *table, int size)
119 return kmemdup(table, size, GFP_ATOMIC);
124 * Set timeout value for state specified by name
127 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to)
131 if (!table || !name || !to)
134 for (i = 0; i < num; i++) {
135 if (strcmp(names[i], name))
144 const char * ip_vs_state_name(__u16 proto, int state)
146 struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
148 if (pp == NULL || pp->state_name == NULL)
149 return (IPPROTO_IP == proto) ? "NONE" : "ERR!";
150 return pp->state_name(state);
155 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp,
156 const struct sk_buff *skb,
161 struct iphdr _iph, *ih;
163 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
165 sprintf(buf, "%s TRUNCATED", pp->name);
166 else if (ih->frag_off & htons(IP_OFFSET))
167 sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag",
168 pp->name, NIPQUAD(ih->saddr),
171 __be16 _ports[2], *pptr
173 pptr = skb_header_pointer(skb, offset + ih->ihl*4,
174 sizeof(_ports), _ports);
176 sprintf(buf, "%s TRUNCATED %u.%u.%u.%u->%u.%u.%u.%u",
181 sprintf(buf, "%s %u.%u.%u.%u:%u->%u.%u.%u.%u:%u",
189 printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
193 int ip_vs_protocol_init(void)
196 #define REGISTER_PROTOCOL(p) \
198 register_ip_vs_protocol(p); \
199 strcat(protocols, ", "); \
200 strcat(protocols, (p)->name); \
205 #ifdef CONFIG_IP_VS_PROTO_TCP
206 REGISTER_PROTOCOL(&ip_vs_protocol_tcp);
208 #ifdef CONFIG_IP_VS_PROTO_UDP
209 REGISTER_PROTOCOL(&ip_vs_protocol_udp);
211 #ifdef CONFIG_IP_VS_PROTO_AH
212 REGISTER_PROTOCOL(&ip_vs_protocol_ah);
214 #ifdef CONFIG_IP_VS_PROTO_ESP
215 REGISTER_PROTOCOL(&ip_vs_protocol_esp);
217 IP_VS_INFO("Registered protocols (%s)\n", &protocols[2]);
223 void ip_vs_protocol_cleanup(void)
225 struct ip_vs_protocol *pp;
228 /* unregister all the ipvs protocols */
229 for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
230 while ((pp = ip_vs_proto_table[i]) != NULL)
231 unregister_ip_vs_protocol(pp);