--- /dev/null
+/*
+ * ip_vs_proto.c: transport protocol load balancing support for IPVS
+ *
+ * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
+ * Julian Anastasov <ja@ssi.bg>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Changes:
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <net/protocol.h>
+#include <net/tcp.h>
+#include <net/udp.h>
+#include <asm/system.h>
+#include <linux/stat.h>
+#include <linux/proc_fs.h>
+
+#include <net/ip_vs.h>
+
+
+/*
+ * IPVS protocols can only be registered/unregistered when the ipvs
+ * module is loaded/unloaded, so no lock is needed in accessing the
+ * ipvs protocol table.
+ */
+
+#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
+#define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
+
+static struct ip_vs_protocol *ip_vs_proto_table[IP_VS_PROTO_TAB_SIZE];
+
+
+/*
+ * register an ipvs protocol
+ */
+static int __used __init register_ip_vs_protocol(struct ip_vs_protocol *pp)
+{
+ unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
+
+ pp->next = ip_vs_proto_table[hash];
+ ip_vs_proto_table[hash] = pp;
+
+ if (pp->init != NULL)
+ pp->init(pp);
+
+ return 0;
+}
+
+
+/*
+ * unregister an ipvs protocol
+ */
+static int unregister_ip_vs_protocol(struct ip_vs_protocol *pp)
+{
+ struct ip_vs_protocol **pp_p;
+ unsigned hash = IP_VS_PROTO_HASH(pp->protocol);
+
+ pp_p = &ip_vs_proto_table[hash];
+ for (; *pp_p; pp_p = &(*pp_p)->next) {
+ if (*pp_p == pp) {
+ *pp_p = pp->next;
+ if (pp->exit != NULL)
+ pp->exit(pp);
+ return 0;
+ }
+ }
+
+ return -ESRCH;
+}
+
+
+/*
+ * get ip_vs_protocol object by its proto.
+ */
+struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto)
+{
+ struct ip_vs_protocol *pp;
+ unsigned hash = IP_VS_PROTO_HASH(proto);
+
+ for (pp = ip_vs_proto_table[hash]; pp; pp = pp->next) {
+ if (pp->protocol == proto)
+ return pp;
+ }
+
+ return NULL;
+}
+
+
+/*
+ * Propagate event for state change to all protocols
+ */
+void ip_vs_protocol_timeout_change(int flags)
+{
+ struct ip_vs_protocol *pp;
+ int i;
+
+ for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
+ for (pp = ip_vs_proto_table[i]; pp; pp = pp->next) {
+ if (pp->timeout_change)
+ pp->timeout_change(pp, flags);
+ }
+ }
+}
+
+
+int *
+ip_vs_create_timeout_table(int *table, int size)
+{
+ return kmemdup(table, size, GFP_ATOMIC);
+}
+
+
+/*
+ * Set timeout value for state specified by name
+ */
+int
+ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to)
+{
+ int i;
+
+ if (!table || !name || !to)
+ return -EINVAL;
+
+ for (i = 0; i < num; i++) {
+ if (strcmp(names[i], name))
+ continue;
+ table[i] = to * HZ;
+ return 0;
+ }
+ return -ENOENT;
+}
+
+
+const char * ip_vs_state_name(__u16 proto, int state)
+{
+ struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
+
+ if (pp == NULL || pp->state_name == NULL)
+ return (IPPROTO_IP == proto) ? "NONE" : "ERR!";
+ return pp->state_name(state);
+}
+
+
+static void
+ip_vs_tcpudp_debug_packet_v4(struct ip_vs_protocol *pp,
+ const struct sk_buff *skb,
+ int offset,
+ const char *msg)
+{
+ char buf[128];
+ struct iphdr _iph, *ih;
+
+ ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
+ if (ih == NULL)
+ sprintf(buf, "%s TRUNCATED", pp->name);
+ else if (ih->frag_off & htons(IP_OFFSET))
+ sprintf(buf, "%s %u.%u.%u.%u->%u.%u.%u.%u frag",
+ pp->name, NIPQUAD(ih->saddr),
+ NIPQUAD(ih->daddr));
+ else {
+ __be16 _ports[2], *pptr
+;
+ pptr = skb_header_pointer(skb, offset + ih->ihl*4,
+ sizeof(_ports), _ports);
+ if (pptr == NULL)
+ sprintf(buf, "%s TRUNCATED %u.%u.%u.%u->%u.%u.%u.%u",
+ pp->name,
+ NIPQUAD(ih->saddr),
+ NIPQUAD(ih->daddr));
+ else
+ sprintf(buf, "%s %u.%u.%u.%u:%u->%u.%u.%u.%u:%u",
+ pp->name,
+ NIPQUAD(ih->saddr),
+ ntohs(pptr[0]),
+ NIPQUAD(ih->daddr),
+ ntohs(pptr[1]));
+ }
+
+ printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
+}
+
+#ifdef CONFIG_IP_VS_IPV6
+static void
+ip_vs_tcpudp_debug_packet_v6(struct ip_vs_protocol *pp,
+ const struct sk_buff *skb,
+ int offset,
+ const char *msg)
+{
+ char buf[192];
+ struct ipv6hdr _iph, *ih;
+
+ ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
+ if (ih == NULL)
+ sprintf(buf, "%s TRUNCATED", pp->name);
+ else if (ih->nexthdr == IPPROTO_FRAGMENT)
+ sprintf(buf, "%s " NIP6_FMT "->" NIP6_FMT " frag",
+ pp->name, NIP6(ih->saddr),
+ NIP6(ih->daddr));
+ else {
+ __be16 _ports[2], *pptr;
+
+ pptr = skb_header_pointer(skb, offset + sizeof(struct ipv6hdr),
+ sizeof(_ports), _ports);
+ if (pptr == NULL)
+ sprintf(buf, "%s TRUNCATED " NIP6_FMT "->" NIP6_FMT,
+ pp->name,
+ NIP6(ih->saddr),
+ NIP6(ih->daddr));
+ else
+ sprintf(buf, "%s " NIP6_FMT ":%u->" NIP6_FMT ":%u",
+ pp->name,
+ NIP6(ih->saddr),
+ ntohs(pptr[0]),
+ NIP6(ih->daddr),
+ ntohs(pptr[1]));
+ }
+
+ printk(KERN_DEBUG "IPVS: %s: %s\n", msg, buf);
+}
+#endif
+
+
+void
+ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp,
+ const struct sk_buff *skb,
+ int offset,
+ const char *msg)
+{
+#ifdef CONFIG_IP_VS_IPV6
+ if (skb->protocol == htons(ETH_P_IPV6))
+ ip_vs_tcpudp_debug_packet_v6(pp, skb, offset, msg);
+ else
+#endif
+ ip_vs_tcpudp_debug_packet_v4(pp, skb, offset, msg);
+}
+
+
+int __init ip_vs_protocol_init(void)
+{
+ char protocols[64];
+#define REGISTER_PROTOCOL(p) \
+ do { \
+ register_ip_vs_protocol(p); \
+ strcat(protocols, ", "); \
+ strcat(protocols, (p)->name); \
+ } while (0)
+
+ protocols[0] = '\0';
+ protocols[2] = '\0';
+#ifdef CONFIG_IP_VS_PROTO_TCP
+ REGISTER_PROTOCOL(&ip_vs_protocol_tcp);
+#endif
+#ifdef CONFIG_IP_VS_PROTO_UDP
+ REGISTER_PROTOCOL(&ip_vs_protocol_udp);
+#endif
+#ifdef CONFIG_IP_VS_PROTO_AH
+ REGISTER_PROTOCOL(&ip_vs_protocol_ah);
+#endif
+#ifdef CONFIG_IP_VS_PROTO_ESP
+ REGISTER_PROTOCOL(&ip_vs_protocol_esp);
+#endif
+ IP_VS_INFO("Registered protocols (%s)\n", &protocols[2]);
+
+ return 0;
+}
+
+
+void ip_vs_protocol_cleanup(void)
+{
+ struct ip_vs_protocol *pp;
+ int i;
+
+ /* unregister all the ipvs protocols */
+ for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
+ while ((pp = ip_vs_proto_table[i]) != NULL)
+ unregister_ip_vs_protocol(pp);
+ }
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff