// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ip_vs_proto.c: transport protocol load balancing support for IPVS
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*
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* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
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* Julian Anastasov <ja@ssi.bg>
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*
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* Changes:
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*/
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#define KMSG_COMPONENT "IPVS"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/gfp.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <net/protocol.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <linux/stat.h>
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#include <linux/proc_fs.h>
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#include <net/ip_vs.h>
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/*
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* IPVS protocols can only be registered/unregistered when the ipvs
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* module is loaded/unloaded, so no lock is needed in accessing the
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* ipvs protocol table.
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*/
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#define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */
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#define IP_VS_PROTO_HASH(proto) ((proto) & (IP_VS_PROTO_TAB_SIZE-1))
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static struct ip_vs_protocol *ip_vs_proto_table[IP_VS_PROTO_TAB_SIZE];
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/* States for conn templates: NONE or words separated with ",", max 15 chars */
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static const char *ip_vs_ctpl_state_name_table[IP_VS_CTPL_S_LAST] = {
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[IP_VS_CTPL_S_NONE] = "NONE",
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[IP_VS_CTPL_S_ASSURED] = "ASSURED",
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};
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/*
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* register an ipvs protocol
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*/
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static int __used __init register_ip_vs_protocol(struct ip_vs_protocol *pp)
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{
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unsigned int hash = IP_VS_PROTO_HASH(pp->protocol);
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pp->next = ip_vs_proto_table[hash];
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ip_vs_proto_table[hash] = pp;
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if (pp->init != NULL)
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pp->init(pp);
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return 0;
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}
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/*
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* register an ipvs protocols netns related data
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*/
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static int
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register_ip_vs_proto_netns(struct netns_ipvs *ipvs, struct ip_vs_protocol *pp)
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{
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unsigned int hash = IP_VS_PROTO_HASH(pp->protocol);
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struct ip_vs_proto_data *pd =
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kzalloc(sizeof(struct ip_vs_proto_data), GFP_KERNEL);
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if (!pd)
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return -ENOMEM;
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pd->pp = pp; /* For speed issues */
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pd->next = ipvs->proto_data_table[hash];
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ipvs->proto_data_table[hash] = pd;
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atomic_set(&pd->appcnt, 0); /* Init app counter */
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if (pp->init_netns != NULL) {
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int ret = pp->init_netns(ipvs, pd);
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if (ret) {
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/* unlink an free proto data */
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ipvs->proto_data_table[hash] = pd->next;
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kfree(pd);
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return ret;
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}
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}
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return 0;
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}
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/*
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* unregister an ipvs protocol
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*/
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static int unregister_ip_vs_protocol(struct ip_vs_protocol *pp)
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{
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struct ip_vs_protocol **pp_p;
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unsigned int hash = IP_VS_PROTO_HASH(pp->protocol);
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pp_p = &ip_vs_proto_table[hash];
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for (; *pp_p; pp_p = &(*pp_p)->next) {
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if (*pp_p == pp) {
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*pp_p = pp->next;
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if (pp->exit != NULL)
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pp->exit(pp);
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return 0;
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}
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}
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return -ESRCH;
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}
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/*
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* unregister an ipvs protocols netns data
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*/
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static int
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unregister_ip_vs_proto_netns(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd)
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{
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struct ip_vs_proto_data **pd_p;
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unsigned int hash = IP_VS_PROTO_HASH(pd->pp->protocol);
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pd_p = &ipvs->proto_data_table[hash];
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for (; *pd_p; pd_p = &(*pd_p)->next) {
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if (*pd_p == pd) {
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*pd_p = pd->next;
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if (pd->pp->exit_netns != NULL)
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pd->pp->exit_netns(ipvs, pd);
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kfree(pd);
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return 0;
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}
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}
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return -ESRCH;
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}
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/*
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* get ip_vs_protocol object by its proto.
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*/
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struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto)
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{
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struct ip_vs_protocol *pp;
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unsigned int hash = IP_VS_PROTO_HASH(proto);
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for (pp = ip_vs_proto_table[hash]; pp; pp = pp->next) {
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if (pp->protocol == proto)
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return pp;
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}
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return NULL;
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}
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EXPORT_SYMBOL(ip_vs_proto_get);
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/*
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* get ip_vs_protocol object data by netns and proto
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*/
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struct ip_vs_proto_data *
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ip_vs_proto_data_get(struct netns_ipvs *ipvs, unsigned short proto)
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{
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struct ip_vs_proto_data *pd;
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unsigned int hash = IP_VS_PROTO_HASH(proto);
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for (pd = ipvs->proto_data_table[hash]; pd; pd = pd->next) {
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if (pd->pp->protocol == proto)
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return pd;
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}
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return NULL;
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}
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EXPORT_SYMBOL(ip_vs_proto_data_get);
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/*
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* Propagate event for state change to all protocols
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*/
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void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags)
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{
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struct ip_vs_proto_data *pd;
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int i;
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for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
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for (pd = ipvs->proto_data_table[i]; pd; pd = pd->next) {
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if (pd->pp->timeout_change)
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pd->pp->timeout_change(pd, flags);
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}
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}
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}
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int *
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ip_vs_create_timeout_table(int *table, int size)
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{
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return kmemdup(table, size, GFP_KERNEL);
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}
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const char *ip_vs_state_name(const struct ip_vs_conn *cp)
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{
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unsigned int state = cp->state;
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struct ip_vs_protocol *pp;
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if (cp->flags & IP_VS_CONN_F_TEMPLATE) {
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if (state >= IP_VS_CTPL_S_LAST)
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return "ERR!";
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return ip_vs_ctpl_state_name_table[state] ? : "?";
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}
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pp = ip_vs_proto_get(cp->protocol);
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if (pp == NULL || pp->state_name == NULL)
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return (cp->protocol == IPPROTO_IP) ? "NONE" : "ERR!";
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return pp->state_name(state);
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}
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static void
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ip_vs_tcpudp_debug_packet_v4(struct ip_vs_protocol *pp,
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const struct sk_buff *skb,
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int offset,
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const char *msg)
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{
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char buf[128];
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struct iphdr _iph, *ih;
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ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
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if (ih == NULL)
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sprintf(buf, "TRUNCATED");
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else if (ih->frag_off & htons(IP_OFFSET))
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sprintf(buf, "%pI4->%pI4 frag", &ih->saddr, &ih->daddr);
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else {
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__be16 _ports[2], *pptr;
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pptr = skb_header_pointer(skb, offset + ih->ihl*4,
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sizeof(_ports), _ports);
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if (pptr == NULL)
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sprintf(buf, "TRUNCATED %pI4->%pI4",
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&ih->saddr, &ih->daddr);
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else
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sprintf(buf, "%pI4:%u->%pI4:%u",
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&ih->saddr, ntohs(pptr[0]),
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&ih->daddr, ntohs(pptr[1]));
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}
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pr_debug("%s: %s %s\n", msg, pp->name, buf);
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}
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#ifdef CONFIG_IP_VS_IPV6
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static void
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ip_vs_tcpudp_debug_packet_v6(struct ip_vs_protocol *pp,
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const struct sk_buff *skb,
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int offset,
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const char *msg)
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{
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char buf[192];
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struct ipv6hdr _iph, *ih;
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ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
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if (ih == NULL)
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sprintf(buf, "TRUNCATED");
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else if (ih->nexthdr == IPPROTO_FRAGMENT)
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sprintf(buf, "%pI6c->%pI6c frag", &ih->saddr, &ih->daddr);
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else {
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__be16 _ports[2], *pptr;
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pptr = skb_header_pointer(skb, offset + sizeof(struct ipv6hdr),
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sizeof(_ports), _ports);
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if (pptr == NULL)
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sprintf(buf, "TRUNCATED %pI6c->%pI6c",
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&ih->saddr, &ih->daddr);
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else
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sprintf(buf, "%pI6c:%u->%pI6c:%u",
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&ih->saddr, ntohs(pptr[0]),
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&ih->daddr, ntohs(pptr[1]));
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}
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pr_debug("%s: %s %s\n", msg, pp->name, buf);
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}
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#endif
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void
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ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
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const struct sk_buff *skb,
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int offset,
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const char *msg)
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{
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#ifdef CONFIG_IP_VS_IPV6
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if (af == AF_INET6)
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ip_vs_tcpudp_debug_packet_v6(pp, skb, offset, msg);
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else
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#endif
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ip_vs_tcpudp_debug_packet_v4(pp, skb, offset, msg);
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}
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/*
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* per network name-space init
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*/
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int __net_init ip_vs_protocol_net_init(struct netns_ipvs *ipvs)
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{
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int i, ret;
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static struct ip_vs_protocol *protos[] = {
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#ifdef CONFIG_IP_VS_PROTO_TCP
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&ip_vs_protocol_tcp,
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#endif
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#ifdef CONFIG_IP_VS_PROTO_UDP
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&ip_vs_protocol_udp,
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#endif
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#ifdef CONFIG_IP_VS_PROTO_SCTP
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&ip_vs_protocol_sctp,
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#endif
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#ifdef CONFIG_IP_VS_PROTO_AH
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&ip_vs_protocol_ah,
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#endif
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#ifdef CONFIG_IP_VS_PROTO_ESP
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&ip_vs_protocol_esp,
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#endif
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};
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for (i = 0; i < ARRAY_SIZE(protos); i++) {
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ret = register_ip_vs_proto_netns(ipvs, protos[i]);
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if (ret < 0)
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goto cleanup;
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}
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return 0;
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cleanup:
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ip_vs_protocol_net_cleanup(ipvs);
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return ret;
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}
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void __net_exit ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs)
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{
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struct ip_vs_proto_data *pd;
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int i;
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/* unregister all the ipvs proto data for this netns */
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for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
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while ((pd = ipvs->proto_data_table[i]) != NULL)
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unregister_ip_vs_proto_netns(ipvs, pd);
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}
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}
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int __init ip_vs_protocol_init(void)
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{
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char protocols[64];
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#define REGISTER_PROTOCOL(p) \
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do { \
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register_ip_vs_protocol(p); \
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strcat(protocols, ", "); \
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strcat(protocols, (p)->name); \
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} while (0)
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protocols[0] = '\0';
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protocols[2] = '\0';
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#ifdef CONFIG_IP_VS_PROTO_TCP
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REGISTER_PROTOCOL(&ip_vs_protocol_tcp);
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#endif
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#ifdef CONFIG_IP_VS_PROTO_UDP
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REGISTER_PROTOCOL(&ip_vs_protocol_udp);
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#endif
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#ifdef CONFIG_IP_VS_PROTO_SCTP
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REGISTER_PROTOCOL(&ip_vs_protocol_sctp);
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#endif
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#ifdef CONFIG_IP_VS_PROTO_AH
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REGISTER_PROTOCOL(&ip_vs_protocol_ah);
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#endif
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#ifdef CONFIG_IP_VS_PROTO_ESP
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REGISTER_PROTOCOL(&ip_vs_protocol_esp);
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#endif
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pr_info("Registered protocols (%s)\n", &protocols[2]);
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return 0;
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}
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void ip_vs_protocol_cleanup(void)
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{
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struct ip_vs_protocol *pp;
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int i;
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/* unregister all the ipvs protocols */
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for (i = 0; i < IP_VS_PROTO_TAB_SIZE; i++) {
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while ((pp = ip_vs_proto_table[i]) != NULL)
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unregister_ip_vs_protocol(pp);
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}
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}
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