2 * ip_vs_proto.c: transport protocol load balancing support for IPVS
4 * Version: $Id: ip_vs_proto.c,v 1.2 2003/04/18 09:03:16 wensong Exp $
6 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
7 * Julian Anastasov <ja@ssi.bg>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/skbuff.h>
23 #include <net/protocol.h>
26 #include <asm/system.h>
27 #include <linux/stat.h>
28 #include <linux/proc_fs.h>
30 #include <net/ip_vs.h>
34 * IPVS protocols can only be registered/unregistered when the ipvs
35 * module is loaded/unloaded, so no lock is needed in accessing the
36 * ipvs protocol table.
39 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
40 #define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
42 static struct ip_vs_protocol *ip_vs_proto_table[IP_VS_PROTO_TAB_SIZE];
46 * register an ipvs protocol
48 static int register_ip_vs_protocol(struct ip_vs_protocol *pp)
50 unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
52 pp->next = ip_vs_proto_table[hash];
53 ip_vs_proto_table[hash] = pp;
63 * unregister an ipvs protocol
65 static int unregister_ip_vs_protocol(struct ip_vs_protocol *pp)
67 struct ip_vs_protocol **pp_p;
68 unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
70 pp_p = &ip_vs_proto_table[hash];
71 for (; *pp_p; pp_p = &(*pp_p)->next) {
85 * get ip_vs_protocol object by its proto.
87 struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto)
89 struct ip_vs_protocol *pp;
90 unsigned hash = IP_VS_PROTO_HASH(proto);
92 for (pp = ip_vs_proto_table[hash]; pp; pp = pp->next) {
93 if (pp->protocol == proto)
102 * Propagate event for state change to all protocols
104 void ip_vs_protocol_timeout_change(int flags)
106 struct ip_vs_protocol *pp;
109 for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
110 for (pp = ip_vs_proto_table[i]; pp; pp = pp->next) {
111 if (pp->timeout_change)
112 pp->timeout_change(pp, flags);
119 ip_vs_create_timeout_table(int *table, int size)
123 t = kmalloc(size, GFP_ATOMIC);
126 memcpy(t, table, size);
132 * Set timeout value for state specified by name
135 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to)
139 if (!table || !name || !to)
142 for (i = 0; i < num; i++) {
143 if (strcmp(names[i], name))
152 const char * ip_vs_state_name(__u16 proto, int state)
154 struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
156 if (pp == NULL || pp->state_name == NULL)
158 return pp->state_name(state);
163 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp,
164 const struct sk_buff *skb,
169 struct iphdr _iph, *ih;
171 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
173 sprintf(buf, "%s TRUNCATED", pp->name);
174 else if (ih->frag_off & __constant_htons(IP_OFFSET))
175 sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag",
176 pp->name, NIPQUAD(ih->saddr),
179 __u16 _ports[2], *pptr
181 pptr = skb_header_pointer(skb, offset + ih->ihl*4,
182 sizeof(_ports), _ports);
184 sprintf(buf, "%s TRUNCATED %u.%u.%u.%u->%u.%u.%u.%u",
189 sprintf(buf, "%s %u.%u.%u.%u:%u->%u.%u.%u.%u:%u",
197 printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
201 int ip_vs_protocol_init(void)
204 #define REGISTER_PROTOCOL(p) \
206 register_ip_vs_protocol(p); \
207 strcat(protocols, ", "); \
208 strcat(protocols, (p)->name); \
213 #ifdef CONFIG_IP_VS_PROTO_TCP
214 REGISTER_PROTOCOL(&ip_vs_protocol_tcp);
216 #ifdef CONFIG_IP_VS_PROTO_UDP
217 REGISTER_PROTOCOL(&ip_vs_protocol_udp);
219 #ifdef CONFIG_IP_VS_PROTO_AH
220 REGISTER_PROTOCOL(&ip_vs_protocol_ah);
222 #ifdef CONFIG_IP_VS_PROTO_ESP
223 REGISTER_PROTOCOL(&ip_vs_protocol_esp);
225 IP_VS_INFO("Registered protocols (%s)\n", &protocols[2]);
231 void ip_vs_protocol_cleanup(void)
233 struct ip_vs_protocol *pp;
236 /* unregister all the ipvs protocols */
237 for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
238 while ((pp = ip_vs_proto_table[i]) != NULL)
239 unregister_ip_vs_protocol(pp);