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From: <pageexec@freemail.hu> $subject was fixed in 2.4 already, 2.6 needs it as well. The impact of the bugs is a kernel stack overflow and privilege escalation from CAP_NET_ADMIN via the IP_VS_SO_SET_STARTDAEMON/IP_VS_SO_GET_DAEMON ioctls. People running with 'root=all caps' (i.e., most users) are not really affected (there's nothing to escalate), but SELinux and similar users should take it seriously if they grant CAP_NET_ADMIN to other users. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
892 lines
22 KiB
C
892 lines
22 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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* Version: $Id: ip_vs_sync.c,v 1.13 2003/06/08 09:31:19 wensong Exp $
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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/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 <net/ip.h>
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#include <net/sock.h>
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#include <asm/uaccess.h> /* for get_fs and set_fs */
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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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__u16 cport;
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__u16 vport;
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__u16 dport;
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__u32 caddr; /* client address */
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__u32 vaddr; /* virtual address */
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__u32 daddr; /* destination address */
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/* Flags and state transition */
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__u16 flags; /* status flags */
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__u16 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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#define IP_VS_SYNC_CONN_TIMEOUT (3*60*HZ)
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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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| 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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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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/* multicast addr */
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static struct sockaddr_in mcast_addr;
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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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list_add_tail(&sb->list, &ip_vs_sync_queue);
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spin_unlock(&ip_vs_sync_lock);
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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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/*
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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;
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s->vaddr = cp->vaddr;
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s->daddr = cp->daddr;
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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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char *p;
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int i;
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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("bogus message\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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s = (struct ip_vs_sync_conn *)p;
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cp = ip_vs_conn_in_get(s->protocol,
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s->caddr, s->cport,
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s->vaddr, s->vport);
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if (!cp) {
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cp = ip_vs_conn_new(s->protocol,
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s->caddr, s->cport,
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s->vaddr, s->vport,
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s->daddr, s->dport,
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ntohs(s->flags), NULL);
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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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cp->state = ntohs(s->state);
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} else if (!cp->dest) {
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/* it is an entry created by the synchronization */
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cp->state = ntohs(s->state);
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cp->flags = ntohs(s->flags) | IP_VS_CONN_F_HASHED;
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} /* Note that we don't touch its state and flags
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if it is a normal entry. */
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if (ntohs(s->flags) & IP_VS_CONN_F_SEQ_MASK) {
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opt = (struct ip_vs_sync_conn_options *)&s[1];
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memcpy(&cp->in_seq, opt, sizeof(*opt));
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p += FULL_CONN_SIZE;
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} else
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p += SIMPLE_CONN_SIZE;
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atomic_set(&cp->in_pkts, sysctl_ip_vs_sync_threshold[0]);
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cp->timeout = IP_VS_SYNC_CONN_TIMEOUT;
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ip_vs_conn_put(cp);
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if (p > buffer+buflen) {
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IP_VS_ERR("bogus message\n");
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return;
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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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* 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(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);
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inet->mc_index = dev->ifindex;
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/* inet->mc_addr = 0; */
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release_sock(sk);
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return 0;
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}
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/*
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* Set the maximum length of sync message according to the
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* specified interface's MTU.
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*/
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static int set_sync_mesg_maxlen(int sync_state)
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{
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struct net_device *dev;
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int num;
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if (sync_state == IP_VS_STATE_MASTER) {
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if ((dev = __dev_get_by_name(ip_vs_master_mcast_ifn)) == NULL)
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return -ENODEV;
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num = (dev->mtu - sizeof(struct iphdr) -
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sizeof(struct udphdr) -
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SYNC_MESG_HEADER_LEN - 20) / SIMPLE_CONN_SIZE;
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sync_send_mesg_maxlen =
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SYNC_MESG_HEADER_LEN + SIMPLE_CONN_SIZE * num;
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IP_VS_DBG(7, "setting the maximum length of sync sending "
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"message %d.\n", sync_send_mesg_maxlen);
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} else if (sync_state == IP_VS_STATE_BACKUP) {
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if ((dev = __dev_get_by_name(ip_vs_backup_mcast_ifn)) == NULL)
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return -ENODEV;
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sync_recv_mesg_maxlen = dev->mtu -
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sizeof(struct iphdr) - sizeof(struct udphdr);
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IP_VS_DBG(7, "setting the maximum length of sync receiving "
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"message %d.\n", sync_recv_mesg_maxlen);
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}
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return 0;
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}
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/*
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* Join a multicast group.
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* the group is specified by a class D multicast address 224.0.0.0/8
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* in the in_addr structure passed in as a parameter.
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*/
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static int
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join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
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{
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struct ip_mreqn mreq;
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struct net_device *dev;
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int ret;
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memset(&mreq, 0, sizeof(mreq));
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memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
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if ((dev = __dev_get_by_name(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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mreq.imr_ifindex = dev->ifindex;
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lock_sock(sk);
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ret = ip_mc_join_group(sk, &mreq);
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release_sock(sk);
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return ret;
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}
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static int bind_mcastif_addr(struct socket *sock, char *ifname)
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{
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struct net_device *dev;
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u32 addr;
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struct sockaddr_in sin;
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if ((dev = __dev_get_by_name(ifname)) == NULL)
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return -ENODEV;
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addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
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if (!addr)
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IP_VS_ERR("You probably need to specify IP address on "
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"multicast interface.\n");
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IP_VS_DBG(7, "binding socket with (%s) %u.%u.%u.%u\n",
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ifname, NIPQUAD(addr));
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/* Now bind the socket with the address of multicast interface */
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = addr;
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sin.sin_port = 0;
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return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin));
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}
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/*
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* Set up sending multicast socket over UDP
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*/
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static struct socket * make_send_sock(void)
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{
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struct socket *sock;
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/* First create a socket */
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if (sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock) < 0) {
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IP_VS_ERR("Error during creation of socket; terminating\n");
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return NULL;
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}
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if (set_mcast_if(sock->sk, ip_vs_master_mcast_ifn) < 0) {
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IP_VS_ERR("Error setting outbound mcast interface\n");
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goto error;
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}
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set_mcast_loop(sock->sk, 0);
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set_mcast_ttl(sock->sk, 1);
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|
|
if (bind_mcastif_addr(sock, ip_vs_master_mcast_ifn) < 0) {
|
|
IP_VS_ERR("Error binding address of the mcast interface\n");
|
|
goto error;
|
|
}
|
|
|
|
if (sock->ops->connect(sock,
|
|
(struct sockaddr*)&mcast_addr,
|
|
sizeof(struct sockaddr), 0) < 0) {
|
|
IP_VS_ERR("Error connecting to the multicast addr\n");
|
|
goto error;
|
|
}
|
|
|
|
return sock;
|
|
|
|
error:
|
|
sock_release(sock);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* Set up receiving multicast socket over UDP
|
|
*/
|
|
static struct socket * make_receive_sock(void)
|
|
{
|
|
struct socket *sock;
|
|
|
|
/* First create a socket */
|
|
if (sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock) < 0) {
|
|
IP_VS_ERR("Error during creation of socket; terminating\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* it is equivalent to the REUSEADDR option in user-space */
|
|
sock->sk->sk_reuse = 1;
|
|
|
|
if (sock->ops->bind(sock,
|
|
(struct sockaddr*)&mcast_addr,
|
|
sizeof(struct sockaddr)) < 0) {
|
|
IP_VS_ERR("Error binding to the multicast addr\n");
|
|
goto error;
|
|
}
|
|
|
|
/* join the multicast group */
|
|
if (join_mcast_group(sock->sk,
|
|
(struct in_addr*)&mcast_addr.sin_addr,
|
|
ip_vs_backup_mcast_ifn) < 0) {
|
|
IP_VS_ERR("Error joining to the multicast group\n");
|
|
goto error;
|
|
}
|
|
|
|
return sock;
|
|
|
|
error:
|
|
sock_release(sock);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
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 DECLARE_WAIT_QUEUE_HEAD(sync_wait);
|
|
static pid_t sync_master_pid = 0;
|
|
static pid_t sync_backup_pid = 0;
|
|
|
|
static DECLARE_WAIT_QUEUE_HEAD(stop_sync_wait);
|
|
static int stop_master_sync = 0;
|
|
static int stop_backup_sync = 0;
|
|
|
|
static void sync_master_loop(void)
|
|
{
|
|
struct socket *sock;
|
|
struct ip_vs_sync_buff *sb;
|
|
|
|
/* create the sending multicast socket */
|
|
sock = make_send_sock();
|
|
if (!sock)
|
|
return;
|
|
|
|
IP_VS_INFO("sync thread started: state = MASTER, mcast_ifn = %s, "
|
|
"syncid = %d\n",
|
|
ip_vs_master_mcast_ifn, ip_vs_master_syncid);
|
|
|
|
for (;;) {
|
|
while ((sb=sb_dequeue())) {
|
|
ip_vs_send_sync_msg(sock, sb->mesg);
|
|
ip_vs_sync_buff_release(sb);
|
|
}
|
|
|
|
/* check if entries stay in curr_sb for 2 seconds */
|
|
if ((sb = get_curr_sync_buff(2*HZ))) {
|
|
ip_vs_send_sync_msg(sock, sb->mesg);
|
|
ip_vs_sync_buff_release(sb);
|
|
}
|
|
|
|
if (stop_master_sync)
|
|
break;
|
|
|
|
ssleep(1);
|
|
}
|
|
|
|
/* 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(sock);
|
|
}
|
|
|
|
|
|
static void sync_backup_loop(void)
|
|
{
|
|
struct socket *sock;
|
|
char *buf;
|
|
int len;
|
|
|
|
if (!(buf = kmalloc(sync_recv_mesg_maxlen, GFP_ATOMIC))) {
|
|
IP_VS_ERR("sync_backup_loop: kmalloc error\n");
|
|
return;
|
|
}
|
|
|
|
/* create the receiving multicast socket */
|
|
sock = make_receive_sock();
|
|
if (!sock)
|
|
goto out;
|
|
|
|
IP_VS_INFO("sync thread started: state = BACKUP, mcast_ifn = %s, "
|
|
"syncid = %d\n",
|
|
ip_vs_backup_mcast_ifn, ip_vs_backup_syncid);
|
|
|
|
for (;;) {
|
|
/* do you have data now? */
|
|
while (!skb_queue_empty(&(sock->sk->sk_receive_queue))) {
|
|
if ((len =
|
|
ip_vs_receive(sock, buf,
|
|
sync_recv_mesg_maxlen)) <= 0) {
|
|
IP_VS_ERR("receiving message error\n");
|
|
break;
|
|
}
|
|
/* disable bottom half, because it accessed the data
|
|
shared by softirq while getting/creating conns */
|
|
local_bh_disable();
|
|
ip_vs_process_message(buf, len);
|
|
local_bh_enable();
|
|
}
|
|
|
|
if (stop_backup_sync)
|
|
break;
|
|
|
|
ssleep(1);
|
|
}
|
|
|
|
/* release the sending multicast socket */
|
|
sock_release(sock);
|
|
|
|
out:
|
|
kfree(buf);
|
|
}
|
|
|
|
|
|
static void set_sync_pid(int sync_state, pid_t sync_pid)
|
|
{
|
|
if (sync_state == IP_VS_STATE_MASTER)
|
|
sync_master_pid = sync_pid;
|
|
else if (sync_state == IP_VS_STATE_BACKUP)
|
|
sync_backup_pid = sync_pid;
|
|
}
|
|
|
|
static void set_stop_sync(int sync_state, int set)
|
|
{
|
|
if (sync_state == IP_VS_STATE_MASTER)
|
|
stop_master_sync = set;
|
|
else if (sync_state == IP_VS_STATE_BACKUP)
|
|
stop_backup_sync = set;
|
|
else {
|
|
stop_master_sync = set;
|
|
stop_backup_sync = set;
|
|
}
|
|
}
|
|
|
|
static int sync_thread(void *startup)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
mm_segment_t oldmm;
|
|
int state;
|
|
const char *name;
|
|
|
|
/* increase the module use count */
|
|
ip_vs_use_count_inc();
|
|
|
|
if (ip_vs_sync_state & IP_VS_STATE_MASTER && !sync_master_pid) {
|
|
state = IP_VS_STATE_MASTER;
|
|
name = "ipvs_syncmaster";
|
|
} else if (ip_vs_sync_state & IP_VS_STATE_BACKUP && !sync_backup_pid) {
|
|
state = IP_VS_STATE_BACKUP;
|
|
name = "ipvs_syncbackup";
|
|
} else {
|
|
IP_VS_BUG();
|
|
ip_vs_use_count_dec();
|
|
return -EINVAL;
|
|
}
|
|
|
|
daemonize(name);
|
|
|
|
oldmm = get_fs();
|
|
set_fs(KERNEL_DS);
|
|
|
|
/* Block all signals */
|
|
spin_lock_irq(¤t->sighand->siglock);
|
|
siginitsetinv(¤t->blocked, 0);
|
|
recalc_sigpending();
|
|
spin_unlock_irq(¤t->sighand->siglock);
|
|
|
|
/* set the maximum length of sync message */
|
|
set_sync_mesg_maxlen(state);
|
|
|
|
/* set up multicast address */
|
|
mcast_addr.sin_family = AF_INET;
|
|
mcast_addr.sin_port = htons(IP_VS_SYNC_PORT);
|
|
mcast_addr.sin_addr.s_addr = htonl(IP_VS_SYNC_GROUP);
|
|
|
|
add_wait_queue(&sync_wait, &wait);
|
|
|
|
set_sync_pid(state, current->pid);
|
|
complete((struct completion *)startup);
|
|
|
|
/* processing master/backup loop here */
|
|
if (state == IP_VS_STATE_MASTER)
|
|
sync_master_loop();
|
|
else if (state == IP_VS_STATE_BACKUP)
|
|
sync_backup_loop();
|
|
else IP_VS_BUG();
|
|
|
|
remove_wait_queue(&sync_wait, &wait);
|
|
|
|
/* thread exits */
|
|
set_sync_pid(state, 0);
|
|
IP_VS_INFO("sync thread stopped!\n");
|
|
|
|
set_fs(oldmm);
|
|
|
|
/* decrease the module use count */
|
|
ip_vs_use_count_dec();
|
|
|
|
set_stop_sync(state, 0);
|
|
wake_up(&stop_sync_wait);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int fork_sync_thread(void *startup)
|
|
{
|
|
pid_t pid;
|
|
|
|
/* fork the sync thread here, then the parent process of the
|
|
sync thread is the init process after this thread exits. */
|
|
repeat:
|
|
if ((pid = kernel_thread(sync_thread, startup, 0)) < 0) {
|
|
IP_VS_ERR("could not create sync_thread due to %d... "
|
|
"retrying.\n", pid);
|
|
ssleep(1);
|
|
goto repeat;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int start_sync_thread(int state, char *mcast_ifn, __u8 syncid)
|
|
{
|
|
DECLARE_COMPLETION(startup);
|
|
pid_t pid;
|
|
|
|
if ((state == IP_VS_STATE_MASTER && sync_master_pid) ||
|
|
(state == IP_VS_STATE_BACKUP && sync_backup_pid))
|
|
return -EEXIST;
|
|
|
|
IP_VS_DBG(7, "%s: pid %d\n", __FUNCTION__, current->pid);
|
|
IP_VS_DBG(7, "Each ip_vs_sync_conn entry need %Zd bytes\n",
|
|
sizeof(struct ip_vs_sync_conn));
|
|
|
|
ip_vs_sync_state |= state;
|
|
if (state == IP_VS_STATE_MASTER) {
|
|
strlcpy(ip_vs_master_mcast_ifn, mcast_ifn, sizeof(ip_vs_master_mcast_ifn));
|
|
ip_vs_master_syncid = syncid;
|
|
} else {
|
|
strlcpy(ip_vs_backup_mcast_ifn, mcast_ifn, sizeof(ip_vs_backup_mcast_ifn));
|
|
ip_vs_backup_syncid = syncid;
|
|
}
|
|
|
|
repeat:
|
|
if ((pid = kernel_thread(fork_sync_thread, &startup, 0)) < 0) {
|
|
IP_VS_ERR("could not create fork_sync_thread due to %d... "
|
|
"retrying.\n", pid);
|
|
ssleep(1);
|
|
goto repeat;
|
|
}
|
|
|
|
wait_for_completion(&startup);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int stop_sync_thread(int state)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
if ((state == IP_VS_STATE_MASTER && !sync_master_pid) ||
|
|
(state == IP_VS_STATE_BACKUP && !sync_backup_pid))
|
|
return -ESRCH;
|
|
|
|
IP_VS_DBG(7, "%s: pid %d\n", __FUNCTION__, current->pid);
|
|
IP_VS_INFO("stopping sync thread %d ...\n",
|
|
(state == IP_VS_STATE_MASTER) ? sync_master_pid : sync_backup_pid);
|
|
|
|
__set_current_state(TASK_UNINTERRUPTIBLE);
|
|
add_wait_queue(&stop_sync_wait, &wait);
|
|
set_stop_sync(state, 1);
|
|
ip_vs_sync_state -= state;
|
|
wake_up(&sync_wait);
|
|
schedule();
|
|
__set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&stop_sync_wait, &wait);
|
|
|
|
/* Note: no need to reap the sync thread, because its parent
|
|
process is the init process */
|
|
|
|
if ((state == IP_VS_STATE_MASTER && stop_master_sync) ||
|
|
(state == IP_VS_STATE_BACKUP && stop_backup_sync))
|
|
IP_VS_BUG();
|
|
|
|
return 0;
|
|
}
|