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);