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![Harvey Harrison](/assets/img/avatar_default.png)
Using NIPQUAD() with NIPQUAD_FMT, %d.%d.%d.%d or %u.%u.%u.%u can be replaced with %pI4 Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
942 lines
23 KiB
C
942 lines
23 KiB
C
/*
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* IPVS An implementation of the IP virtual server support for the
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* LINUX operating system. IPVS is now implemented as a module
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* over the NetFilter framework. IPVS can be used to build a
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* high-performance and highly available server based on a
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* cluster of servers.
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*
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* Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
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*
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* ip_vs_sync: sync connection info from master load balancer to backups
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* through multicast
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*
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* Changes:
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* Alexandre Cassen : Added master & backup support at a time.
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* Alexandre Cassen : Added SyncID support for incoming sync
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* messages filtering.
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* Justin Ossevoort : Fix endian problem on sync message size.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/inetdevice.h>
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#include <linux/net.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <linux/igmp.h> /* for ip_mc_join_group */
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#include <linux/udp.h>
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#include <linux/err.h>
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#include <linux/kthread.h>
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#include <linux/wait.h>
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#include <linux/kernel.h>
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#include <net/ip.h>
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#include <net/sock.h>
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#include <net/ip_vs.h>
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#define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */
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#define IP_VS_SYNC_PORT 8848 /* multicast port */
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/*
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* IPVS sync connection entry
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*/
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struct ip_vs_sync_conn {
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__u8 reserved;
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/* Protocol, addresses and port numbers */
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__u8 protocol; /* Which protocol (TCP/UDP) */
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__be16 cport;
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__be16 vport;
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__be16 dport;
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__be32 caddr; /* client address */
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__be32 vaddr; /* virtual address */
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__be32 daddr; /* destination address */
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/* Flags and state transition */
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__be16 flags; /* status flags */
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__be16 state; /* state info */
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/* The sequence options start here */
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};
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struct ip_vs_sync_conn_options {
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struct ip_vs_seq in_seq; /* incoming seq. struct */
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struct ip_vs_seq out_seq; /* outgoing seq. struct */
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};
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struct ip_vs_sync_thread_data {
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struct socket *sock;
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char *buf;
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};
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#define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn))
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#define FULL_CONN_SIZE \
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(sizeof(struct ip_vs_sync_conn) + sizeof(struct ip_vs_sync_conn_options))
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/*
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The master mulitcasts messages to the backup load balancers in the
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following format.
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Count Conns | SyncID | Size |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| |
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| IPVS Sync Connection (1) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| . |
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| . |
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| . |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| |
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| IPVS Sync Connection (n) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define SYNC_MESG_HEADER_LEN 4
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#define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */
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struct ip_vs_sync_mesg {
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__u8 nr_conns;
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__u8 syncid;
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__u16 size;
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/* ip_vs_sync_conn entries start here */
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};
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/* the maximum length of sync (sending/receiving) message */
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static int sync_send_mesg_maxlen;
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static int sync_recv_mesg_maxlen;
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struct ip_vs_sync_buff {
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struct list_head list;
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unsigned long firstuse;
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/* pointers for the message data */
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struct ip_vs_sync_mesg *mesg;
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unsigned char *head;
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unsigned char *end;
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};
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/* the sync_buff list head and the lock */
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static LIST_HEAD(ip_vs_sync_queue);
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static DEFINE_SPINLOCK(ip_vs_sync_lock);
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/* current sync_buff for accepting new conn entries */
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static struct ip_vs_sync_buff *curr_sb = NULL;
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static DEFINE_SPINLOCK(curr_sb_lock);
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/* ipvs sync daemon state */
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volatile int ip_vs_sync_state = IP_VS_STATE_NONE;
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volatile int ip_vs_master_syncid = 0;
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volatile int ip_vs_backup_syncid = 0;
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/* multicast interface name */
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char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
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char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
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/* sync daemon tasks */
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static struct task_struct *sync_master_thread;
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static struct task_struct *sync_backup_thread;
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/* multicast addr */
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static struct sockaddr_in mcast_addr = {
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.sin_family = AF_INET,
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.sin_port = __constant_htons(IP_VS_SYNC_PORT),
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.sin_addr.s_addr = __constant_htonl(IP_VS_SYNC_GROUP),
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};
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static inline struct ip_vs_sync_buff *sb_dequeue(void)
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{
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struct ip_vs_sync_buff *sb;
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spin_lock_bh(&ip_vs_sync_lock);
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if (list_empty(&ip_vs_sync_queue)) {
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sb = NULL;
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} else {
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sb = list_entry(ip_vs_sync_queue.next,
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struct ip_vs_sync_buff,
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list);
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list_del(&sb->list);
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}
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spin_unlock_bh(&ip_vs_sync_lock);
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return sb;
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}
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static inline struct ip_vs_sync_buff * ip_vs_sync_buff_create(void)
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{
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struct ip_vs_sync_buff *sb;
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if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
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return NULL;
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if (!(sb->mesg=kmalloc(sync_send_mesg_maxlen, GFP_ATOMIC))) {
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kfree(sb);
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return NULL;
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}
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sb->mesg->nr_conns = 0;
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sb->mesg->syncid = ip_vs_master_syncid;
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sb->mesg->size = 4;
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sb->head = (unsigned char *)sb->mesg + 4;
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sb->end = (unsigned char *)sb->mesg + sync_send_mesg_maxlen;
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sb->firstuse = jiffies;
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return sb;
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}
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static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
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{
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kfree(sb->mesg);
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kfree(sb);
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}
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static inline void sb_queue_tail(struct ip_vs_sync_buff *sb)
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{
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spin_lock(&ip_vs_sync_lock);
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if (ip_vs_sync_state & IP_VS_STATE_MASTER)
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list_add_tail(&sb->list, &ip_vs_sync_queue);
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else
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ip_vs_sync_buff_release(sb);
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spin_unlock(&ip_vs_sync_lock);
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}
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/*
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* Get the current sync buffer if it has been created for more
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* than the specified time or the specified time is zero.
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*/
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static inline struct ip_vs_sync_buff *
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get_curr_sync_buff(unsigned long time)
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{
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struct ip_vs_sync_buff *sb;
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spin_lock_bh(&curr_sb_lock);
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if (curr_sb && (time == 0 ||
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time_before(jiffies - curr_sb->firstuse, time))) {
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sb = curr_sb;
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curr_sb = NULL;
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} else
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sb = NULL;
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spin_unlock_bh(&curr_sb_lock);
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return sb;
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}
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/*
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* Add an ip_vs_conn information into the current sync_buff.
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* Called by ip_vs_in.
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*/
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void ip_vs_sync_conn(struct ip_vs_conn *cp)
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{
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struct ip_vs_sync_mesg *m;
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struct ip_vs_sync_conn *s;
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int len;
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spin_lock(&curr_sb_lock);
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if (!curr_sb) {
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if (!(curr_sb=ip_vs_sync_buff_create())) {
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spin_unlock(&curr_sb_lock);
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IP_VS_ERR("ip_vs_sync_buff_create failed.\n");
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return;
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}
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}
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len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
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SIMPLE_CONN_SIZE;
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m = curr_sb->mesg;
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s = (struct ip_vs_sync_conn *)curr_sb->head;
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/* copy members */
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s->protocol = cp->protocol;
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s->cport = cp->cport;
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s->vport = cp->vport;
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s->dport = cp->dport;
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s->caddr = cp->caddr.ip;
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s->vaddr = cp->vaddr.ip;
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s->daddr = cp->daddr.ip;
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s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
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s->state = htons(cp->state);
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if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
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struct ip_vs_sync_conn_options *opt =
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(struct ip_vs_sync_conn_options *)&s[1];
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memcpy(opt, &cp->in_seq, sizeof(*opt));
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}
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m->nr_conns++;
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m->size += len;
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curr_sb->head += len;
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/* check if there is a space for next one */
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if (curr_sb->head+FULL_CONN_SIZE > curr_sb->end) {
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sb_queue_tail(curr_sb);
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curr_sb = NULL;
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}
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spin_unlock(&curr_sb_lock);
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/* synchronize its controller if it has */
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if (cp->control)
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ip_vs_sync_conn(cp->control);
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}
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/*
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* Process received multicast message and create the corresponding
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* ip_vs_conn entries.
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*/
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static void ip_vs_process_message(const char *buffer, const size_t buflen)
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{
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struct ip_vs_sync_mesg *m = (struct ip_vs_sync_mesg *)buffer;
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struct ip_vs_sync_conn *s;
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struct ip_vs_sync_conn_options *opt;
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struct ip_vs_conn *cp;
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struct ip_vs_protocol *pp;
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struct ip_vs_dest *dest;
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char *p;
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int i;
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if (buflen < sizeof(struct ip_vs_sync_mesg)) {
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IP_VS_ERR_RL("sync message header too short\n");
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return;
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}
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/* Convert size back to host byte order */
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m->size = ntohs(m->size);
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if (buflen != m->size) {
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IP_VS_ERR_RL("bogus sync message size\n");
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return;
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}
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/* SyncID sanity check */
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if (ip_vs_backup_syncid != 0 && m->syncid != ip_vs_backup_syncid) {
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IP_VS_DBG(7, "Ignoring incoming msg with syncid = %d\n",
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m->syncid);
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return;
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}
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p = (char *)buffer + sizeof(struct ip_vs_sync_mesg);
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for (i=0; i<m->nr_conns; i++) {
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unsigned flags, state;
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if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
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IP_VS_ERR_RL("bogus conn in sync message\n");
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return;
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}
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s = (struct ip_vs_sync_conn *) p;
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flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
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flags &= ~IP_VS_CONN_F_HASHED;
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if (flags & IP_VS_CONN_F_SEQ_MASK) {
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opt = (struct ip_vs_sync_conn_options *)&s[1];
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p += FULL_CONN_SIZE;
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if (p > buffer+buflen) {
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IP_VS_ERR_RL("bogus conn options in sync message\n");
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return;
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}
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} else {
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opt = NULL;
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p += SIMPLE_CONN_SIZE;
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}
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state = ntohs(s->state);
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if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
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pp = ip_vs_proto_get(s->protocol);
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if (!pp) {
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IP_VS_ERR_RL("Unsupported protocol %u in sync msg\n",
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s->protocol);
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continue;
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}
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if (state >= pp->num_states) {
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IP_VS_DBG(2, "Invalid %s state %u in sync msg\n",
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pp->name, state);
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continue;
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}
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} else {
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/* protocol in templates is not used for state/timeout */
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pp = NULL;
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if (state > 0) {
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IP_VS_DBG(2, "Invalid template state %u in sync msg\n",
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state);
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state = 0;
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}
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}
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if (!(flags & IP_VS_CONN_F_TEMPLATE))
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cp = ip_vs_conn_in_get(AF_INET, s->protocol,
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(union nf_inet_addr *)&s->caddr,
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s->cport,
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(union nf_inet_addr *)&s->vaddr,
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s->vport);
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else
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cp = ip_vs_ct_in_get(AF_INET, s->protocol,
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(union nf_inet_addr *)&s->caddr,
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s->cport,
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(union nf_inet_addr *)&s->vaddr,
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s->vport);
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if (!cp) {
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/*
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* Find the appropriate destination for the connection.
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* If it is not found the connection will remain unbound
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* but still handled.
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*/
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dest = ip_vs_find_dest(AF_INET,
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(union nf_inet_addr *)&s->daddr,
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s->dport,
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(union nf_inet_addr *)&s->vaddr,
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s->vport,
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s->protocol);
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/* Set the approprite ativity flag */
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if (s->protocol == IPPROTO_TCP) {
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if (state != IP_VS_TCP_S_ESTABLISHED)
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flags |= IP_VS_CONN_F_INACTIVE;
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else
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flags &= ~IP_VS_CONN_F_INACTIVE;
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}
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cp = ip_vs_conn_new(AF_INET, s->protocol,
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(union nf_inet_addr *)&s->caddr,
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s->cport,
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(union nf_inet_addr *)&s->vaddr,
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s->vport,
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(union nf_inet_addr *)&s->daddr,
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s->dport,
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flags, dest);
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if (dest)
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atomic_dec(&dest->refcnt);
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if (!cp) {
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IP_VS_ERR("ip_vs_conn_new failed\n");
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return;
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}
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} else if (!cp->dest) {
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dest = ip_vs_try_bind_dest(cp);
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if (dest)
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atomic_dec(&dest->refcnt);
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} else if ((cp->dest) && (cp->protocol == IPPROTO_TCP) &&
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(cp->state != state)) {
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/* update active/inactive flag for the connection */
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dest = cp->dest;
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if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
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(state != IP_VS_TCP_S_ESTABLISHED)) {
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atomic_dec(&dest->activeconns);
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atomic_inc(&dest->inactconns);
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cp->flags |= IP_VS_CONN_F_INACTIVE;
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} else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
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(state == IP_VS_TCP_S_ESTABLISHED)) {
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atomic_inc(&dest->activeconns);
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atomic_dec(&dest->inactconns);
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cp->flags &= ~IP_VS_CONN_F_INACTIVE;
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}
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}
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if (opt)
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memcpy(&cp->in_seq, opt, sizeof(*opt));
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atomic_set(&cp->in_pkts, sysctl_ip_vs_sync_threshold[0]);
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cp->state = state;
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cp->old_state = cp->state;
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/*
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* We can not recover the right timeout for templates
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* in all cases, we can not find the right fwmark
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* virtual service. If needed, we can do it for
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* non-fwmark persistent services.
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*/
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if (!(flags & IP_VS_CONN_F_TEMPLATE) && pp->timeout_table)
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cp->timeout = pp->timeout_table[state];
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else
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cp->timeout = (3*60*HZ);
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ip_vs_conn_put(cp);
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}
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}
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|
|
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/*
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* Setup loopback of outgoing multicasts on a sending socket
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*/
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static void set_mcast_loop(struct sock *sk, u_char loop)
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{
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struct inet_sock *inet = inet_sk(sk);
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/* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
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lock_sock(sk);
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inet->mc_loop = loop ? 1 : 0;
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release_sock(sk);
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}
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/*
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* Specify TTL for outgoing multicasts on a sending socket
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*/
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static void set_mcast_ttl(struct sock *sk, u_char ttl)
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{
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struct inet_sock *inet = inet_sk(sk);
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/* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
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lock_sock(sk);
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inet->mc_ttl = ttl;
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release_sock(sk);
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}
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|
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/*
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* Specifiy default interface for outgoing multicasts
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*/
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static int set_mcast_if(struct sock *sk, char *ifname)
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{
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struct net_device *dev;
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struct inet_sock *inet = inet_sk(sk);
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if ((dev = __dev_get_by_name(&init_net, ifname)) == NULL)
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return -ENODEV;
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if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
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return -EINVAL;
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lock_sock(sk);
|
|
inet->mc_index = dev->ifindex;
|
|
/* inet->mc_addr = 0; */
|
|
release_sock(sk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set the maximum length of sync message according to the
|
|
* specified interface's MTU.
|
|
*/
|
|
static int set_sync_mesg_maxlen(int sync_state)
|
|
{
|
|
struct net_device *dev;
|
|
int num;
|
|
|
|
if (sync_state == IP_VS_STATE_MASTER) {
|
|
if ((dev = __dev_get_by_name(&init_net, ip_vs_master_mcast_ifn)) == NULL)
|
|
return -ENODEV;
|
|
|
|
num = (dev->mtu - sizeof(struct iphdr) -
|
|
sizeof(struct udphdr) -
|
|
SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE;
|
|
sync_send_mesg_maxlen = SYNC_MESG_HEADER_LEN +
|
|
SIMPLE_CONN_SIZE * min(num, MAX_CONNS_PER_SYNCBUFF);
|
|
IP_VS_DBG(7, "setting the maximum length of sync sending "
|
|
"message %d.\n", sync_send_mesg_maxlen);
|
|
} else if (sync_state == IP_VS_STATE_BACKUP) {
|
|
if ((dev = __dev_get_by_name(&init_net, ip_vs_backup_mcast_ifn)) == NULL)
|
|
return -ENODEV;
|
|
|
|
sync_recv_mesg_maxlen = dev->mtu -
|
|
sizeof(struct iphdr) - sizeof(struct udphdr);
|
|
IP_VS_DBG(7, "setting the maximum length of sync receiving "
|
|
"message %d.\n", sync_recv_mesg_maxlen);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Join a multicast group.
|
|
* the group is specified by a class D multicast address 224.0.0.0/8
|
|
* in the in_addr structure passed in as a parameter.
|
|
*/
|
|
static int
|
|
join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
|
|
{
|
|
struct ip_mreqn mreq;
|
|
struct net_device *dev;
|
|
int ret;
|
|
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
|
|
|
|
if ((dev = __dev_get_by_name(&init_net, ifname)) == NULL)
|
|
return -ENODEV;
|
|
if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
|
|
return -EINVAL;
|
|
|
|
mreq.imr_ifindex = dev->ifindex;
|
|
|
|
lock_sock(sk);
|
|
ret = ip_mc_join_group(sk, &mreq);
|
|
release_sock(sk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int bind_mcastif_addr(struct socket *sock, char *ifname)
|
|
{
|
|
struct net_device *dev;
|
|
__be32 addr;
|
|
struct sockaddr_in sin;
|
|
|
|
if ((dev = __dev_get_by_name(&init_net, ifname)) == NULL)
|
|
return -ENODEV;
|
|
|
|
addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
|
|
if (!addr)
|
|
IP_VS_ERR("You probably need to specify IP address on "
|
|
"multicast interface.\n");
|
|
|
|
IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
|
|
ifname, &addr);
|
|
|
|
/* Now bind the socket with the address of multicast interface */
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = addr;
|
|
sin.sin_port = 0;
|
|
|
|
return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
|
|
}
|
|
|
|
/*
|
|
* Set up sending multicast socket over UDP
|
|
*/
|
|
static struct socket * make_send_sock(void)
|
|
{
|
|
struct socket *sock;
|
|
int result;
|
|
|
|
/* First create a socket */
|
|
result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
|
|
if (result < 0) {
|
|
IP_VS_ERR("Error during creation of socket; terminating\n");
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
result = set_mcast_if(sock->sk, ip_vs_master_mcast_ifn);
|
|
if (result < 0) {
|
|
IP_VS_ERR("Error setting outbound mcast interface\n");
|
|
goto error;
|
|
}
|
|
|
|
set_mcast_loop(sock->sk, 0);
|
|
set_mcast_ttl(sock->sk, 1);
|
|
|
|
result = bind_mcastif_addr(sock, ip_vs_master_mcast_ifn);
|
|
if (result < 0) {
|
|
IP_VS_ERR("Error binding address of the mcast interface\n");
|
|
goto error;
|
|
}
|
|
|
|
result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
|
|
sizeof(struct sockaddr), 0);
|
|
if (result < 0) {
|
|
IP_VS_ERR("Error connecting to the multicast addr\n");
|
|
goto error;
|
|
}
|
|
|
|
return sock;
|
|
|
|
error:
|
|
sock_release(sock);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
|
|
/*
|
|
* Set up receiving multicast socket over UDP
|
|
*/
|
|
static struct socket * make_receive_sock(void)
|
|
{
|
|
struct socket *sock;
|
|
int result;
|
|
|
|
/* First create a socket */
|
|
result = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
|
|
if (result < 0) {
|
|
IP_VS_ERR("Error during creation of socket; terminating\n");
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
/* it is equivalent to the REUSEADDR option in user-space */
|
|
sock->sk->sk_reuse = 1;
|
|
|
|
result = sock->ops->bind(sock, (struct sockaddr *) &mcast_addr,
|
|
sizeof(struct sockaddr));
|
|
if (result < 0) {
|
|
IP_VS_ERR("Error binding to the multicast addr\n");
|
|
goto error;
|
|
}
|
|
|
|
/* join the multicast group */
|
|
result = join_mcast_group(sock->sk,
|
|
(struct in_addr *) &mcast_addr.sin_addr,
|
|
ip_vs_backup_mcast_ifn);
|
|
if (result < 0) {
|
|
IP_VS_ERR("Error joining to the multicast group\n");
|
|
goto error;
|
|
}
|
|
|
|
return sock;
|
|
|
|
error:
|
|
sock_release(sock);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
|
|
static int
|
|
ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length)
|
|
{
|
|
struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL};
|
|
struct kvec iov;
|
|
int len;
|
|
|
|
EnterFunction(7);
|
|
iov.iov_base = (void *)buffer;
|
|
iov.iov_len = length;
|
|
|
|
len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length));
|
|
|
|
LeaveFunction(7);
|
|
return len;
|
|
}
|
|
|
|
static void
|
|
ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
|
|
{
|
|
int msize;
|
|
|
|
msize = msg->size;
|
|
|
|
/* Put size in network byte order */
|
|
msg->size = htons(msg->size);
|
|
|
|
if (ip_vs_send_async(sock, (char *)msg, msize) != msize)
|
|
IP_VS_ERR("ip_vs_send_async error\n");
|
|
}
|
|
|
|
static int
|
|
ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
|
|
{
|
|
struct msghdr msg = {NULL,};
|
|
struct kvec iov;
|
|
int len;
|
|
|
|
EnterFunction(7);
|
|
|
|
/* Receive a packet */
|
|
iov.iov_base = buffer;
|
|
iov.iov_len = (size_t)buflen;
|
|
|
|
len = kernel_recvmsg(sock, &msg, &iov, 1, buflen, 0);
|
|
|
|
if (len < 0)
|
|
return -1;
|
|
|
|
LeaveFunction(7);
|
|
return len;
|
|
}
|
|
|
|
|
|
static int sync_thread_master(void *data)
|
|
{
|
|
struct ip_vs_sync_thread_data *tinfo = data;
|
|
struct ip_vs_sync_buff *sb;
|
|
|
|
IP_VS_INFO("sync thread started: state = MASTER, mcast_ifn = %s, "
|
|
"syncid = %d\n",
|
|
ip_vs_master_mcast_ifn, ip_vs_master_syncid);
|
|
|
|
while (!kthread_should_stop()) {
|
|
while ((sb = sb_dequeue())) {
|
|
ip_vs_send_sync_msg(tinfo->sock, sb->mesg);
|
|
ip_vs_sync_buff_release(sb);
|
|
}
|
|
|
|
/* check if entries stay in curr_sb for 2 seconds */
|
|
sb = get_curr_sync_buff(2 * HZ);
|
|
if (sb) {
|
|
ip_vs_send_sync_msg(tinfo->sock, sb->mesg);
|
|
ip_vs_sync_buff_release(sb);
|
|
}
|
|
|
|
schedule_timeout_interruptible(HZ);
|
|
}
|
|
|
|
/* clean up the sync_buff queue */
|
|
while ((sb=sb_dequeue())) {
|
|
ip_vs_sync_buff_release(sb);
|
|
}
|
|
|
|
/* clean up the current sync_buff */
|
|
if ((sb = get_curr_sync_buff(0))) {
|
|
ip_vs_sync_buff_release(sb);
|
|
}
|
|
|
|
/* release the sending multicast socket */
|
|
sock_release(tinfo->sock);
|
|
kfree(tinfo);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int sync_thread_backup(void *data)
|
|
{
|
|
struct ip_vs_sync_thread_data *tinfo = data;
|
|
int len;
|
|
|
|
IP_VS_INFO("sync thread started: state = BACKUP, mcast_ifn = %s, "
|
|
"syncid = %d\n",
|
|
ip_vs_backup_mcast_ifn, ip_vs_backup_syncid);
|
|
|
|
while (!kthread_should_stop()) {
|
|
wait_event_interruptible(*tinfo->sock->sk->sk_sleep,
|
|
!skb_queue_empty(&tinfo->sock->sk->sk_receive_queue)
|
|
|| kthread_should_stop());
|
|
|
|
/* do we have data now? */
|
|
while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) {
|
|
len = ip_vs_receive(tinfo->sock, tinfo->buf,
|
|
sync_recv_mesg_maxlen);
|
|
if (len <= 0) {
|
|
IP_VS_ERR("receiving message error\n");
|
|
break;
|
|
}
|
|
|
|
/* disable bottom half, because it accesses the data
|
|
shared by softirq while getting/creating conns */
|
|
local_bh_disable();
|
|
ip_vs_process_message(tinfo->buf, len);
|
|
local_bh_enable();
|
|
}
|
|
}
|
|
|
|
/* release the sending multicast socket */
|
|
sock_release(tinfo->sock);
|
|
kfree(tinfo->buf);
|
|
kfree(tinfo);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int start_sync_thread(int state, char *mcast_ifn, __u8 syncid)
|
|
{
|
|
struct ip_vs_sync_thread_data *tinfo;
|
|
struct task_struct **realtask, *task;
|
|
struct socket *sock;
|
|
char *name, *buf = NULL;
|
|
int (*threadfn)(void *data);
|
|
int result = -ENOMEM;
|
|
|
|
IP_VS_DBG(7, "%s: pid %d\n", __func__, task_pid_nr(current));
|
|
IP_VS_DBG(7, "Each ip_vs_sync_conn entry needs %Zd bytes\n",
|
|
sizeof(struct ip_vs_sync_conn));
|
|
|
|
if (state == IP_VS_STATE_MASTER) {
|
|
if (sync_master_thread)
|
|
return -EEXIST;
|
|
|
|
strlcpy(ip_vs_master_mcast_ifn, mcast_ifn,
|
|
sizeof(ip_vs_master_mcast_ifn));
|
|
ip_vs_master_syncid = syncid;
|
|
realtask = &sync_master_thread;
|
|
name = "ipvs_syncmaster";
|
|
threadfn = sync_thread_master;
|
|
sock = make_send_sock();
|
|
} else if (state == IP_VS_STATE_BACKUP) {
|
|
if (sync_backup_thread)
|
|
return -EEXIST;
|
|
|
|
strlcpy(ip_vs_backup_mcast_ifn, mcast_ifn,
|
|
sizeof(ip_vs_backup_mcast_ifn));
|
|
ip_vs_backup_syncid = syncid;
|
|
realtask = &sync_backup_thread;
|
|
name = "ipvs_syncbackup";
|
|
threadfn = sync_thread_backup;
|
|
sock = make_receive_sock();
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (IS_ERR(sock)) {
|
|
result = PTR_ERR(sock);
|
|
goto out;
|
|
}
|
|
|
|
set_sync_mesg_maxlen(state);
|
|
if (state == IP_VS_STATE_BACKUP) {
|
|
buf = kmalloc(sync_recv_mesg_maxlen, GFP_KERNEL);
|
|
if (!buf)
|
|
goto outsocket;
|
|
}
|
|
|
|
tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL);
|
|
if (!tinfo)
|
|
goto outbuf;
|
|
|
|
tinfo->sock = sock;
|
|
tinfo->buf = buf;
|
|
|
|
task = kthread_run(threadfn, tinfo, name);
|
|
if (IS_ERR(task)) {
|
|
result = PTR_ERR(task);
|
|
goto outtinfo;
|
|
}
|
|
|
|
/* mark as active */
|
|
*realtask = task;
|
|
ip_vs_sync_state |= state;
|
|
|
|
/* increase the module use count */
|
|
ip_vs_use_count_inc();
|
|
|
|
return 0;
|
|
|
|
outtinfo:
|
|
kfree(tinfo);
|
|
outbuf:
|
|
kfree(buf);
|
|
outsocket:
|
|
sock_release(sock);
|
|
out:
|
|
return result;
|
|
}
|
|
|
|
|
|
int stop_sync_thread(int state)
|
|
{
|
|
IP_VS_DBG(7, "%s: pid %d\n", __func__, task_pid_nr(current));
|
|
|
|
if (state == IP_VS_STATE_MASTER) {
|
|
if (!sync_master_thread)
|
|
return -ESRCH;
|
|
|
|
IP_VS_INFO("stopping master sync thread %d ...\n",
|
|
task_pid_nr(sync_master_thread));
|
|
|
|
/*
|
|
* The lock synchronizes with sb_queue_tail(), so that we don't
|
|
* add sync buffers to the queue, when we are already in
|
|
* progress of stopping the master sync daemon.
|
|
*/
|
|
|
|
spin_lock_bh(&ip_vs_sync_lock);
|
|
ip_vs_sync_state &= ~IP_VS_STATE_MASTER;
|
|
spin_unlock_bh(&ip_vs_sync_lock);
|
|
kthread_stop(sync_master_thread);
|
|
sync_master_thread = NULL;
|
|
} else if (state == IP_VS_STATE_BACKUP) {
|
|
if (!sync_backup_thread)
|
|
return -ESRCH;
|
|
|
|
IP_VS_INFO("stopping backup sync thread %d ...\n",
|
|
task_pid_nr(sync_backup_thread));
|
|
|
|
ip_vs_sync_state &= ~IP_VS_STATE_BACKUP;
|
|
kthread_stop(sync_backup_thread);
|
|
sync_backup_thread = NULL;
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* decrease the module use count */
|
|
ip_vs_use_count_dec();
|
|
|
|
return 0;
|
|
}
|