| /* |
| * 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: |
| * |
| */ |
| |
| #define KMSG_COMPONENT "IPVS" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/skbuff.h> |
| #include <linux/gfp.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; |
| } |
| EXPORT_SYMBOL(ip_vs_proto_get); |
| |
| |
| /* |
| * 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, const char *const *names, |
| const 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, "TRUNCATED"); |
| else if (ih->frag_off & htons(IP_OFFSET)) |
| sprintf(buf, "%pI4->%pI4 frag", &ih->saddr, &ih->daddr); |
| else { |
| __be16 _ports[2], *pptr; |
| |
| pptr = skb_header_pointer(skb, offset + ih->ihl*4, |
| sizeof(_ports), _ports); |
| if (pptr == NULL) |
| sprintf(buf, "TRUNCATED %pI4->%pI4", |
| &ih->saddr, &ih->daddr); |
| else |
| sprintf(buf, "%pI4:%u->%pI4:%u", |
| &ih->saddr, ntohs(pptr[0]), |
| &ih->daddr, ntohs(pptr[1])); |
| } |
| |
| pr_debug("%s: %s %s\n", msg, pp->name, 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, "TRUNCATED"); |
| else if (ih->nexthdr == IPPROTO_FRAGMENT) |
| sprintf(buf, "%pI6->%pI6 frag", &ih->saddr, &ih->daddr); |
| else { |
| __be16 _ports[2], *pptr; |
| |
| pptr = skb_header_pointer(skb, offset + sizeof(struct ipv6hdr), |
| sizeof(_ports), _ports); |
| if (pptr == NULL) |
| sprintf(buf, "TRUNCATED %pI6->%pI6", |
| &ih->saddr, &ih->daddr); |
| else |
| sprintf(buf, "%pI6:%u->%pI6:%u", |
| &ih->saddr, ntohs(pptr[0]), |
| &ih->daddr, ntohs(pptr[1])); |
| } |
| |
| pr_debug("%s: %s %s\n", msg, pp->name, buf); |
| } |
| #endif |
| |
| |
| void |
| ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, |
| const struct sk_buff *skb, |
| int offset, |
| const char *msg) |
| { |
| #ifdef CONFIG_IP_VS_IPV6 |
| if (af == AF_INET6) |
| 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_SCTP |
| REGISTER_PROTOCOL(&ip_vs_protocol_sctp); |
| #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 |
| pr_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); |
| } |
| } |