// SPDX-License-Identifier: GPL-2.0
|
/*
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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 1, is capable of handling both version 0 and 1 messages.
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* Version 0 is the plain old format.
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* Note Version 0 receivers will just drop Ver 1 messages.
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* Version 1 is capable of handle IPv6, Persistence data,
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* time-outs, and firewall marks.
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* In ver.1 "ip_vs_sync_conn_options" will be sent in netw. order.
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* Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0
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*
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* Definitions Message: is a complete datagram
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* Sync_conn: is a part of a Message
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* Param Data is an option to a Sync_conn.
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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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* Hans Schillstrom : Added Version 1: i.e. IPv6,
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* Persistence support, fwmark and time-out.
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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/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 <linux/sched/signal.h>
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#include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */
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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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#define SYNC_PROTO_VER 1 /* Protocol version in header */
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static struct lock_class_key __ipvs_sync_key;
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/*
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* IPVS sync connection entry
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* Version 0, i.e. original version.
|
*/
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struct ip_vs_sync_conn_v0 {
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__u8 reserved;
|
|
/* 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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/*
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Sync Connection format (sync_conn)
|
|
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
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| Type | Protocol | Ver. | Size |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Flags |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| State | cport |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| vport | dport |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| fwmark |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| timeout (in sec.) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ... |
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| IP-Addresses (v4 or v6) |
|
| ... |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
Optional Parameters.
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| Param. Type | Param. Length | Param. data |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
|
| ... |
|
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| | Param Type | Param. Length |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Param data |
|
| Last Param data should be padded for 32 bit alignment |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
*/
|
|
/*
|
* Type 0, IPv4 sync connection format
|
*/
|
struct ip_vs_sync_v4 {
|
__u8 type;
|
__u8 protocol; /* Which protocol (TCP/UDP) */
|
__be16 ver_size; /* Version msb 4 bits */
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/* Flags and state transition */
|
__be32 flags; /* status flags */
|
__be16 state; /* state info */
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/* Protocol, addresses and port numbers */
|
__be16 cport;
|
__be16 vport;
|
__be16 dport;
|
__be32 fwmark; /* Firewall mark from skb */
|
__be32 timeout; /* cp timeout */
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__be32 caddr; /* client address */
|
__be32 vaddr; /* virtual address */
|
__be32 daddr; /* destination address */
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/* The sequence options start here */
|
/* PE data padded to 32bit alignment after seq. options */
|
};
|
/*
|
* Type 2 messages IPv6
|
*/
|
struct ip_vs_sync_v6 {
|
__u8 type;
|
__u8 protocol; /* Which protocol (TCP/UDP) */
|
__be16 ver_size; /* Version msb 4 bits */
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/* Flags and state transition */
|
__be32 flags; /* status flags */
|
__be16 state; /* state info */
|
/* Protocol, addresses and port numbers */
|
__be16 cport;
|
__be16 vport;
|
__be16 dport;
|
__be32 fwmark; /* Firewall mark from skb */
|
__be32 timeout; /* cp timeout */
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struct in6_addr caddr; /* client address */
|
struct in6_addr vaddr; /* virtual address */
|
struct in6_addr daddr; /* destination address */
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/* The sequence options start here */
|
/* PE data padded to 32bit alignment after seq. options */
|
};
|
|
union ip_vs_sync_conn {
|
struct ip_vs_sync_v4 v4;
|
struct ip_vs_sync_v6 v6;
|
};
|
|
/* Bits in Type field in above */
|
#define STYPE_INET6 0
|
#define STYPE_F_INET6 (1 << STYPE_INET6)
|
|
#define SVER_SHIFT 12 /* Shift to get version */
|
#define SVER_MASK 0x0fff /* Mask to strip version */
|
|
#define IPVS_OPT_SEQ_DATA 1
|
#define IPVS_OPT_PE_DATA 2
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#define IPVS_OPT_PE_NAME 3
|
#define IPVS_OPT_PARAM 7
|
|
#define IPVS_OPT_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1))
|
#define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA-1))
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#define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1))
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#define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1))
|
|
struct ip_vs_sync_thread_data {
|
struct task_struct *task;
|
struct netns_ipvs *ipvs;
|
struct socket *sock;
|
char *buf;
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int id;
|
};
|
|
/* Version 0 definition of packet sizes */
|
#define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn_v0))
|
#define FULL_CONN_SIZE \
|
(sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options))
|
|
|
/*
|
The master mulitcasts messages (Datagrams) to the backup load balancers
|
in the following format.
|
|
Version 1:
|
Note, first byte should be Zero, so ver 0 receivers will drop the packet.
|
|
0 1 2 3
|
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
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| 0 | SyncID | Size |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| Count Conns | Version | Reserved, set to Zero |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| |
|
| IPVS Sync Connection (1) |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| . |
|
~ . ~
|
| . |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| |
|
| IPVS Sync Connection (n) |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
|
Version 0 Header
|
0 1 2 3
|
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
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| Count Conns | SyncID | Size |
|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
| IPVS Sync Connection (1) |
|
*/
|
|
/* Version 0 header */
|
struct ip_vs_sync_mesg_v0 {
|
__u8 nr_conns;
|
__u8 syncid;
|
__be16 size;
|
|
/* ip_vs_sync_conn entries start here */
|
};
|
|
/* Version 1 header */
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struct ip_vs_sync_mesg {
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__u8 reserved; /* must be zero */
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__u8 syncid;
|
__be16 size;
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__u8 nr_conns;
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__s8 version; /* SYNC_PROTO_VER */
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__u16 spare;
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/* ip_vs_sync_conn entries start here */
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};
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|
union ipvs_sockaddr {
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struct sockaddr_in in;
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struct sockaddr_in6 in6;
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};
|
|
struct ip_vs_sync_buff {
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struct list_head list;
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unsigned long firstuse;
|
|
/* 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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|
/*
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* Copy of struct ip_vs_seq
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* From unaligned network order to aligned host order
|
*/
|
static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho)
|
{
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memset(ho, 0, sizeof(*ho));
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ho->init_seq = get_unaligned_be32(&no->init_seq);
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ho->delta = get_unaligned_be32(&no->delta);
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ho->previous_delta = get_unaligned_be32(&no->previous_delta);
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}
|
|
/*
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* Copy of struct ip_vs_seq
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* From Aligned host order to unaligned network order
|
*/
|
static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no)
|
{
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put_unaligned_be32(ho->init_seq, &no->init_seq);
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put_unaligned_be32(ho->delta, &no->delta);
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put_unaligned_be32(ho->previous_delta, &no->previous_delta);
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}
|
|
static inline struct ip_vs_sync_buff *
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sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
|
{
|
struct ip_vs_sync_buff *sb;
|
|
spin_lock_bh(&ipvs->sync_lock);
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if (list_empty(&ms->sync_queue)) {
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sb = NULL;
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__set_current_state(TASK_INTERRUPTIBLE);
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} else {
|
sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff,
|
list);
|
list_del(&sb->list);
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ms->sync_queue_len--;
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if (!ms->sync_queue_len)
|
ms->sync_queue_delay = 0;
|
}
|
spin_unlock_bh(&ipvs->sync_lock);
|
|
return sb;
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}
|
|
/*
|
* Create a new sync buffer for Version 1 proto.
|
*/
|
static inline struct ip_vs_sync_buff *
|
ip_vs_sync_buff_create(struct netns_ipvs *ipvs, unsigned int len)
|
{
|
struct ip_vs_sync_buff *sb;
|
|
if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
|
return NULL;
|
|
len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg),
|
ipvs->mcfg.sync_maxlen);
|
sb->mesg = kmalloc(len, GFP_ATOMIC);
|
if (!sb->mesg) {
|
kfree(sb);
|
return NULL;
|
}
|
sb->mesg->reserved = 0; /* old nr_conns i.e. must be zero now */
|
sb->mesg->version = SYNC_PROTO_VER;
|
sb->mesg->syncid = ipvs->mcfg.syncid;
|
sb->mesg->size = htons(sizeof(struct ip_vs_sync_mesg));
|
sb->mesg->nr_conns = 0;
|
sb->mesg->spare = 0;
|
sb->head = (unsigned char *)sb->mesg + sizeof(struct ip_vs_sync_mesg);
|
sb->end = (unsigned char *)sb->mesg + len;
|
|
sb->firstuse = jiffies;
|
return sb;
|
}
|
|
static inline void ip_vs_sync_buff_release(struct ip_vs_sync_buff *sb)
|
{
|
kfree(sb->mesg);
|
kfree(sb);
|
}
|
|
static inline void sb_queue_tail(struct netns_ipvs *ipvs,
|
struct ipvs_master_sync_state *ms)
|
{
|
struct ip_vs_sync_buff *sb = ms->sync_buff;
|
|
spin_lock(&ipvs->sync_lock);
|
if (ipvs->sync_state & IP_VS_STATE_MASTER &&
|
ms->sync_queue_len < sysctl_sync_qlen_max(ipvs)) {
|
if (!ms->sync_queue_len)
|
schedule_delayed_work(&ms->master_wakeup_work,
|
max(IPVS_SYNC_SEND_DELAY, 1));
|
ms->sync_queue_len++;
|
list_add_tail(&sb->list, &ms->sync_queue);
|
if ((++ms->sync_queue_delay) == IPVS_SYNC_WAKEUP_RATE) {
|
int id = (int)(ms - ipvs->ms);
|
|
wake_up_process(ipvs->master_tinfo[id].task);
|
}
|
} else
|
ip_vs_sync_buff_release(sb);
|
spin_unlock(&ipvs->sync_lock);
|
}
|
|
/*
|
* Get the current sync buffer if it has been created for more
|
* than the specified time or the specified time is zero.
|
*/
|
static inline struct ip_vs_sync_buff *
|
get_curr_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms,
|
unsigned long time)
|
{
|
struct ip_vs_sync_buff *sb;
|
|
spin_lock_bh(&ipvs->sync_buff_lock);
|
sb = ms->sync_buff;
|
if (sb && time_after_eq(jiffies - sb->firstuse, time)) {
|
ms->sync_buff = NULL;
|
__set_current_state(TASK_RUNNING);
|
} else
|
sb = NULL;
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
return sb;
|
}
|
|
static inline int
|
select_master_thread_id(struct netns_ipvs *ipvs, struct ip_vs_conn *cp)
|
{
|
return ((long) cp >> (1 + ilog2(sizeof(*cp)))) & ipvs->threads_mask;
|
}
|
|
/*
|
* Create a new sync buffer for Version 0 proto.
|
*/
|
static inline struct ip_vs_sync_buff *
|
ip_vs_sync_buff_create_v0(struct netns_ipvs *ipvs, unsigned int len)
|
{
|
struct ip_vs_sync_buff *sb;
|
struct ip_vs_sync_mesg_v0 *mesg;
|
|
if (!(sb=kmalloc(sizeof(struct ip_vs_sync_buff), GFP_ATOMIC)))
|
return NULL;
|
|
len = max_t(unsigned int, len + sizeof(struct ip_vs_sync_mesg_v0),
|
ipvs->mcfg.sync_maxlen);
|
sb->mesg = kmalloc(len, GFP_ATOMIC);
|
if (!sb->mesg) {
|
kfree(sb);
|
return NULL;
|
}
|
mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg;
|
mesg->nr_conns = 0;
|
mesg->syncid = ipvs->mcfg.syncid;
|
mesg->size = htons(sizeof(struct ip_vs_sync_mesg_v0));
|
sb->head = (unsigned char *)mesg + sizeof(struct ip_vs_sync_mesg_v0);
|
sb->end = (unsigned char *)mesg + len;
|
sb->firstuse = jiffies;
|
return sb;
|
}
|
|
/* Check if connection is controlled by persistence */
|
static inline bool in_persistence(struct ip_vs_conn *cp)
|
{
|
for (cp = cp->control; cp; cp = cp->control) {
|
if (cp->flags & IP_VS_CONN_F_TEMPLATE)
|
return true;
|
}
|
return false;
|
}
|
|
/* Check if conn should be synced.
|
* pkts: conn packets, use sysctl_sync_threshold to avoid packet check
|
* - (1) sync_refresh_period: reduce sync rate. Additionally, retry
|
* sync_retries times with period of sync_refresh_period/8
|
* - (2) if both sync_refresh_period and sync_period are 0 send sync only
|
* for state changes or only once when pkts matches sync_threshold
|
* - (3) templates: rate can be reduced only with sync_refresh_period or
|
* with (2)
|
*/
|
static int ip_vs_sync_conn_needed(struct netns_ipvs *ipvs,
|
struct ip_vs_conn *cp, int pkts)
|
{
|
unsigned long orig = READ_ONCE(cp->sync_endtime);
|
unsigned long now = jiffies;
|
unsigned long n = (now + cp->timeout) & ~3UL;
|
unsigned int sync_refresh_period;
|
int sync_period;
|
int force;
|
|
/* Check if we sync in current state */
|
if (unlikely(cp->flags & IP_VS_CONN_F_TEMPLATE))
|
force = 0;
|
else if (unlikely(sysctl_sync_persist_mode(ipvs) && in_persistence(cp)))
|
return 0;
|
else if (likely(cp->protocol == IPPROTO_TCP)) {
|
if (!((1 << cp->state) &
|
((1 << IP_VS_TCP_S_ESTABLISHED) |
|
(1 << IP_VS_TCP_S_FIN_WAIT) |
|
(1 << IP_VS_TCP_S_CLOSE) |
|
(1 << IP_VS_TCP_S_CLOSE_WAIT) |
|
(1 << IP_VS_TCP_S_TIME_WAIT))))
|
return 0;
|
force = cp->state != cp->old_state;
|
if (force && cp->state != IP_VS_TCP_S_ESTABLISHED)
|
goto set;
|
} else if (unlikely(cp->protocol == IPPROTO_SCTP)) {
|
if (!((1 << cp->state) &
|
((1 << IP_VS_SCTP_S_ESTABLISHED) |
|
(1 << IP_VS_SCTP_S_SHUTDOWN_SENT) |
|
(1 << IP_VS_SCTP_S_SHUTDOWN_RECEIVED) |
|
(1 << IP_VS_SCTP_S_SHUTDOWN_ACK_SENT) |
|
(1 << IP_VS_SCTP_S_CLOSED))))
|
return 0;
|
force = cp->state != cp->old_state;
|
if (force && cp->state != IP_VS_SCTP_S_ESTABLISHED)
|
goto set;
|
} else {
|
/* UDP or another protocol with single state */
|
force = 0;
|
}
|
|
sync_refresh_period = sysctl_sync_refresh_period(ipvs);
|
if (sync_refresh_period > 0) {
|
long diff = n - orig;
|
long min_diff = max(cp->timeout >> 1, 10UL * HZ);
|
|
/* Avoid sync if difference is below sync_refresh_period
|
* and below the half timeout.
|
*/
|
if (abs(diff) < min_t(long, sync_refresh_period, min_diff)) {
|
int retries = orig & 3;
|
|
if (retries >= sysctl_sync_retries(ipvs))
|
return 0;
|
if (time_before(now, orig - cp->timeout +
|
(sync_refresh_period >> 3)))
|
return 0;
|
n |= retries + 1;
|
}
|
}
|
sync_period = sysctl_sync_period(ipvs);
|
if (sync_period > 0) {
|
if (!(cp->flags & IP_VS_CONN_F_TEMPLATE) &&
|
pkts % sync_period != sysctl_sync_threshold(ipvs))
|
return 0;
|
} else if (!sync_refresh_period &&
|
pkts != sysctl_sync_threshold(ipvs))
|
return 0;
|
|
set:
|
cp->old_state = cp->state;
|
n = cmpxchg(&cp->sync_endtime, orig, n);
|
return n == orig || force;
|
}
|
|
/*
|
* Version 0 , could be switched in by sys_ctl.
|
* Add an ip_vs_conn information into the current sync_buff.
|
*/
|
static void ip_vs_sync_conn_v0(struct netns_ipvs *ipvs, struct ip_vs_conn *cp,
|
int pkts)
|
{
|
struct ip_vs_sync_mesg_v0 *m;
|
struct ip_vs_sync_conn_v0 *s;
|
struct ip_vs_sync_buff *buff;
|
struct ipvs_master_sync_state *ms;
|
int id;
|
unsigned int len;
|
|
if (unlikely(cp->af != AF_INET))
|
return;
|
/* Do not sync ONE PACKET */
|
if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
|
return;
|
|
if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
|
return;
|
|
spin_lock_bh(&ipvs->sync_buff_lock);
|
if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
return;
|
}
|
|
id = select_master_thread_id(ipvs, cp);
|
ms = &ipvs->ms[id];
|
buff = ms->sync_buff;
|
len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
|
SIMPLE_CONN_SIZE;
|
if (buff) {
|
m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
|
/* Send buffer if it is for v1 */
|
if (buff->head + len > buff->end || !m->nr_conns) {
|
sb_queue_tail(ipvs, ms);
|
ms->sync_buff = NULL;
|
buff = NULL;
|
}
|
}
|
if (!buff) {
|
buff = ip_vs_sync_buff_create_v0(ipvs, len);
|
if (!buff) {
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
pr_err("ip_vs_sync_buff_create failed.\n");
|
return;
|
}
|
ms->sync_buff = buff;
|
}
|
|
m = (struct ip_vs_sync_mesg_v0 *) buff->mesg;
|
s = (struct ip_vs_sync_conn_v0 *) buff->head;
|
|
/* copy members */
|
s->reserved = 0;
|
s->protocol = cp->protocol;
|
s->cport = cp->cport;
|
s->vport = cp->vport;
|
s->dport = cp->dport;
|
s->caddr = cp->caddr.ip;
|
s->vaddr = cp->vaddr.ip;
|
s->daddr = cp->daddr.ip;
|
s->flags = htons(cp->flags & ~IP_VS_CONN_F_HASHED);
|
s->state = htons(cp->state);
|
if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
|
struct ip_vs_sync_conn_options *opt =
|
(struct ip_vs_sync_conn_options *)&s[1];
|
memcpy(opt, &cp->in_seq, sizeof(*opt));
|
}
|
|
m->nr_conns++;
|
m->size = htons(ntohs(m->size) + len);
|
buff->head += len;
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
|
/* synchronize its controller if it has */
|
cp = cp->control;
|
if (cp) {
|
if (cp->flags & IP_VS_CONN_F_TEMPLATE)
|
pkts = atomic_add_return(1, &cp->in_pkts);
|
else
|
pkts = sysctl_sync_threshold(ipvs);
|
ip_vs_sync_conn(ipvs, cp, pkts);
|
}
|
}
|
|
/*
|
* Add an ip_vs_conn information into the current sync_buff.
|
* Called by ip_vs_in.
|
* Sending Version 1 messages
|
*/
|
void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts)
|
{
|
struct ip_vs_sync_mesg *m;
|
union ip_vs_sync_conn *s;
|
struct ip_vs_sync_buff *buff;
|
struct ipvs_master_sync_state *ms;
|
int id;
|
__u8 *p;
|
unsigned int len, pe_name_len, pad;
|
|
/* Handle old version of the protocol */
|
if (sysctl_sync_ver(ipvs) == 0) {
|
ip_vs_sync_conn_v0(ipvs, cp, pkts);
|
return;
|
}
|
/* Do not sync ONE PACKET */
|
if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
|
goto control;
|
sloop:
|
if (!ip_vs_sync_conn_needed(ipvs, cp, pkts))
|
goto control;
|
|
/* Sanity checks */
|
pe_name_len = 0;
|
if (cp->pe_data_len) {
|
if (!cp->pe_data || !cp->dest) {
|
IP_VS_ERR_RL("SYNC, connection pe_data invalid\n");
|
return;
|
}
|
pe_name_len = strnlen(cp->pe->name, IP_VS_PENAME_MAXLEN);
|
}
|
|
spin_lock_bh(&ipvs->sync_buff_lock);
|
if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
return;
|
}
|
|
id = select_master_thread_id(ipvs, cp);
|
ms = &ipvs->ms[id];
|
|
#ifdef CONFIG_IP_VS_IPV6
|
if (cp->af == AF_INET6)
|
len = sizeof(struct ip_vs_sync_v6);
|
else
|
#endif
|
len = sizeof(struct ip_vs_sync_v4);
|
|
if (cp->flags & IP_VS_CONN_F_SEQ_MASK)
|
len += sizeof(struct ip_vs_sync_conn_options) + 2;
|
|
if (cp->pe_data_len)
|
len += cp->pe_data_len + 2; /* + Param hdr field */
|
if (pe_name_len)
|
len += pe_name_len + 2;
|
|
/* check if there is a space for this one */
|
pad = 0;
|
buff = ms->sync_buff;
|
if (buff) {
|
m = buff->mesg;
|
pad = (4 - (size_t) buff->head) & 3;
|
/* Send buffer if it is for v0 */
|
if (buff->head + len + pad > buff->end || m->reserved) {
|
sb_queue_tail(ipvs, ms);
|
ms->sync_buff = NULL;
|
buff = NULL;
|
pad = 0;
|
}
|
}
|
|
if (!buff) {
|
buff = ip_vs_sync_buff_create(ipvs, len);
|
if (!buff) {
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
pr_err("ip_vs_sync_buff_create failed.\n");
|
return;
|
}
|
ms->sync_buff = buff;
|
m = buff->mesg;
|
}
|
|
p = buff->head;
|
buff->head += pad + len;
|
m->size = htons(ntohs(m->size) + pad + len);
|
/* Add ev. padding from prev. sync_conn */
|
while (pad--)
|
*(p++) = 0;
|
|
s = (union ip_vs_sync_conn *)p;
|
|
/* Set message type & copy members */
|
s->v4.type = (cp->af == AF_INET6 ? STYPE_F_INET6 : 0);
|
s->v4.ver_size = htons(len & SVER_MASK); /* Version 0 */
|
s->v4.flags = htonl(cp->flags & ~IP_VS_CONN_F_HASHED);
|
s->v4.state = htons(cp->state);
|
s->v4.protocol = cp->protocol;
|
s->v4.cport = cp->cport;
|
s->v4.vport = cp->vport;
|
s->v4.dport = cp->dport;
|
s->v4.fwmark = htonl(cp->fwmark);
|
s->v4.timeout = htonl(cp->timeout / HZ);
|
m->nr_conns++;
|
|
#ifdef CONFIG_IP_VS_IPV6
|
if (cp->af == AF_INET6) {
|
p += sizeof(struct ip_vs_sync_v6);
|
s->v6.caddr = cp->caddr.in6;
|
s->v6.vaddr = cp->vaddr.in6;
|
s->v6.daddr = cp->daddr.in6;
|
} else
|
#endif
|
{
|
p += sizeof(struct ip_vs_sync_v4); /* options ptr */
|
s->v4.caddr = cp->caddr.ip;
|
s->v4.vaddr = cp->vaddr.ip;
|
s->v4.daddr = cp->daddr.ip;
|
}
|
if (cp->flags & IP_VS_CONN_F_SEQ_MASK) {
|
*(p++) = IPVS_OPT_SEQ_DATA;
|
*(p++) = sizeof(struct ip_vs_sync_conn_options);
|
hton_seq((struct ip_vs_seq *)p, &cp->in_seq);
|
p += sizeof(struct ip_vs_seq);
|
hton_seq((struct ip_vs_seq *)p, &cp->out_seq);
|
p += sizeof(struct ip_vs_seq);
|
}
|
/* Handle pe data */
|
if (cp->pe_data_len && cp->pe_data) {
|
*(p++) = IPVS_OPT_PE_DATA;
|
*(p++) = cp->pe_data_len;
|
memcpy(p, cp->pe_data, cp->pe_data_len);
|
p += cp->pe_data_len;
|
if (pe_name_len) {
|
/* Add PE_NAME */
|
*(p++) = IPVS_OPT_PE_NAME;
|
*(p++) = pe_name_len;
|
memcpy(p, cp->pe->name, pe_name_len);
|
p += pe_name_len;
|
}
|
}
|
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
|
control:
|
/* synchronize its controller if it has */
|
cp = cp->control;
|
if (!cp)
|
return;
|
if (cp->flags & IP_VS_CONN_F_TEMPLATE)
|
pkts = atomic_add_return(1, &cp->in_pkts);
|
else
|
pkts = sysctl_sync_threshold(ipvs);
|
goto sloop;
|
}
|
|
/*
|
* fill_param used by version 1
|
*/
|
static inline int
|
ip_vs_conn_fill_param_sync(struct netns_ipvs *ipvs, int af, union ip_vs_sync_conn *sc,
|
struct ip_vs_conn_param *p,
|
__u8 *pe_data, unsigned int pe_data_len,
|
__u8 *pe_name, unsigned int pe_name_len)
|
{
|
#ifdef CONFIG_IP_VS_IPV6
|
if (af == AF_INET6)
|
ip_vs_conn_fill_param(ipvs, af, sc->v6.protocol,
|
(const union nf_inet_addr *)&sc->v6.caddr,
|
sc->v6.cport,
|
(const union nf_inet_addr *)&sc->v6.vaddr,
|
sc->v6.vport, p);
|
else
|
#endif
|
ip_vs_conn_fill_param(ipvs, af, sc->v4.protocol,
|
(const union nf_inet_addr *)&sc->v4.caddr,
|
sc->v4.cport,
|
(const union nf_inet_addr *)&sc->v4.vaddr,
|
sc->v4.vport, p);
|
/* Handle pe data */
|
if (pe_data_len) {
|
if (pe_name_len) {
|
char buff[IP_VS_PENAME_MAXLEN+1];
|
|
memcpy(buff, pe_name, pe_name_len);
|
buff[pe_name_len]=0;
|
p->pe = __ip_vs_pe_getbyname(buff);
|
if (!p->pe) {
|
IP_VS_DBG(3, "BACKUP, no %s engine found/loaded\n",
|
buff);
|
return 1;
|
}
|
} else {
|
IP_VS_ERR_RL("BACKUP, Invalid PE parameters\n");
|
return 1;
|
}
|
|
p->pe_data = kmemdup(pe_data, pe_data_len, GFP_ATOMIC);
|
if (!p->pe_data) {
|
module_put(p->pe->module);
|
return -ENOMEM;
|
}
|
p->pe_data_len = pe_data_len;
|
}
|
return 0;
|
}
|
|
/*
|
* Connection Add / Update.
|
* Common for version 0 and 1 reception of backup sync_conns.
|
* Param: ...
|
* timeout is in sec.
|
*/
|
static void ip_vs_proc_conn(struct netns_ipvs *ipvs, struct ip_vs_conn_param *param,
|
unsigned int flags, unsigned int state,
|
unsigned int protocol, unsigned int type,
|
const union nf_inet_addr *daddr, __be16 dport,
|
unsigned long timeout, __u32 fwmark,
|
struct ip_vs_sync_conn_options *opt)
|
{
|
struct ip_vs_dest *dest;
|
struct ip_vs_conn *cp;
|
|
if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
|
cp = ip_vs_conn_in_get(param);
|
if (cp && ((cp->dport != dport) ||
|
!ip_vs_addr_equal(cp->daf, &cp->daddr, daddr))) {
|
if (!(flags & IP_VS_CONN_F_INACTIVE)) {
|
ip_vs_conn_expire_now(cp);
|
__ip_vs_conn_put(cp);
|
cp = NULL;
|
} else {
|
/* This is the expiration message for the
|
* connection that was already replaced, so we
|
* just ignore it.
|
*/
|
__ip_vs_conn_put(cp);
|
kfree(param->pe_data);
|
return;
|
}
|
}
|
} else {
|
cp = ip_vs_ct_in_get(param);
|
}
|
|
if (cp) {
|
/* Free pe_data */
|
kfree(param->pe_data);
|
|
dest = cp->dest;
|
spin_lock_bh(&cp->lock);
|
if ((cp->flags ^ flags) & IP_VS_CONN_F_INACTIVE &&
|
!(flags & IP_VS_CONN_F_TEMPLATE) && dest) {
|
if (flags & IP_VS_CONN_F_INACTIVE) {
|
atomic_dec(&dest->activeconns);
|
atomic_inc(&dest->inactconns);
|
} else {
|
atomic_inc(&dest->activeconns);
|
atomic_dec(&dest->inactconns);
|
}
|
}
|
flags &= IP_VS_CONN_F_BACKUP_UPD_MASK;
|
flags |= cp->flags & ~IP_VS_CONN_F_BACKUP_UPD_MASK;
|
cp->flags = flags;
|
spin_unlock_bh(&cp->lock);
|
if (!dest)
|
ip_vs_try_bind_dest(cp);
|
} else {
|
/*
|
* Find the appropriate destination for the connection.
|
* If it is not found the connection will remain unbound
|
* but still handled.
|
*/
|
rcu_read_lock();
|
/* This function is only invoked by the synchronization
|
* code. We do not currently support heterogeneous pools
|
* with synchronization, so we can make the assumption that
|
* the svc_af is the same as the dest_af
|
*/
|
dest = ip_vs_find_dest(ipvs, type, type, daddr, dport,
|
param->vaddr, param->vport, protocol,
|
fwmark, flags);
|
|
cp = ip_vs_conn_new(param, type, daddr, dport, flags, dest,
|
fwmark);
|
rcu_read_unlock();
|
if (!cp) {
|
kfree(param->pe_data);
|
IP_VS_DBG(2, "BACKUP, add new conn. failed\n");
|
return;
|
}
|
if (!(flags & IP_VS_CONN_F_TEMPLATE))
|
kfree(param->pe_data);
|
}
|
|
if (opt) {
|
cp->in_seq = opt->in_seq;
|
cp->out_seq = opt->out_seq;
|
}
|
atomic_set(&cp->in_pkts, sysctl_sync_threshold(ipvs));
|
cp->state = state;
|
cp->old_state = cp->state;
|
/*
|
* For Ver 0 messages style
|
* - Not possible to recover the right timeout for templates
|
* - can not find the right fwmark
|
* virtual service. If needed, we can do it for
|
* non-fwmark persistent services.
|
* Ver 1 messages style.
|
* - No problem.
|
*/
|
if (timeout) {
|
if (timeout > MAX_SCHEDULE_TIMEOUT / HZ)
|
timeout = MAX_SCHEDULE_TIMEOUT / HZ;
|
cp->timeout = timeout*HZ;
|
} else {
|
struct ip_vs_proto_data *pd;
|
|
pd = ip_vs_proto_data_get(ipvs, protocol);
|
if (!(flags & IP_VS_CONN_F_TEMPLATE) && pd && pd->timeout_table)
|
cp->timeout = pd->timeout_table[state];
|
else
|
cp->timeout = (3*60*HZ);
|
}
|
ip_vs_conn_put(cp);
|
}
|
|
/*
|
* Process received multicast message for Version 0
|
*/
|
static void ip_vs_process_message_v0(struct netns_ipvs *ipvs, const char *buffer,
|
const size_t buflen)
|
{
|
struct ip_vs_sync_mesg_v0 *m = (struct ip_vs_sync_mesg_v0 *)buffer;
|
struct ip_vs_sync_conn_v0 *s;
|
struct ip_vs_sync_conn_options *opt;
|
struct ip_vs_protocol *pp;
|
struct ip_vs_conn_param param;
|
char *p;
|
int i;
|
|
p = (char *)buffer + sizeof(struct ip_vs_sync_mesg_v0);
|
for (i=0; i<m->nr_conns; i++) {
|
unsigned int flags, state;
|
|
if (p + SIMPLE_CONN_SIZE > buffer+buflen) {
|
IP_VS_ERR_RL("BACKUP v0, bogus conn\n");
|
return;
|
}
|
s = (struct ip_vs_sync_conn_v0 *) p;
|
flags = ntohs(s->flags) | IP_VS_CONN_F_SYNC;
|
flags &= ~IP_VS_CONN_F_HASHED;
|
if (flags & IP_VS_CONN_F_SEQ_MASK) {
|
opt = (struct ip_vs_sync_conn_options *)&s[1];
|
p += FULL_CONN_SIZE;
|
if (p > buffer+buflen) {
|
IP_VS_ERR_RL("BACKUP v0, Dropping buffer bogus conn options\n");
|
return;
|
}
|
} else {
|
opt = NULL;
|
p += SIMPLE_CONN_SIZE;
|
}
|
|
state = ntohs(s->state);
|
if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
|
pp = ip_vs_proto_get(s->protocol);
|
if (!pp) {
|
IP_VS_DBG(2, "BACKUP v0, Unsupported protocol %u\n",
|
s->protocol);
|
continue;
|
}
|
if (state >= pp->num_states) {
|
IP_VS_DBG(2, "BACKUP v0, Invalid %s state %u\n",
|
pp->name, state);
|
continue;
|
}
|
} else {
|
if (state >= IP_VS_CTPL_S_LAST)
|
IP_VS_DBG(7, "BACKUP v0, Invalid tpl state %u\n",
|
state);
|
}
|
|
ip_vs_conn_fill_param(ipvs, AF_INET, s->protocol,
|
(const union nf_inet_addr *)&s->caddr,
|
s->cport,
|
(const union nf_inet_addr *)&s->vaddr,
|
s->vport, ¶m);
|
|
/* Send timeout as Zero */
|
ip_vs_proc_conn(ipvs, ¶m, flags, state, s->protocol, AF_INET,
|
(union nf_inet_addr *)&s->daddr, s->dport,
|
0, 0, opt);
|
}
|
}
|
|
/*
|
* Handle options
|
*/
|
static inline int ip_vs_proc_seqopt(__u8 *p, unsigned int plen,
|
__u32 *opt_flags,
|
struct ip_vs_sync_conn_options *opt)
|
{
|
struct ip_vs_sync_conn_options *topt;
|
|
topt = (struct ip_vs_sync_conn_options *)p;
|
|
if (plen != sizeof(struct ip_vs_sync_conn_options)) {
|
IP_VS_DBG(2, "BACKUP, bogus conn options length\n");
|
return -EINVAL;
|
}
|
if (*opt_flags & IPVS_OPT_F_SEQ_DATA) {
|
IP_VS_DBG(2, "BACKUP, conn options found twice\n");
|
return -EINVAL;
|
}
|
ntoh_seq(&topt->in_seq, &opt->in_seq);
|
ntoh_seq(&topt->out_seq, &opt->out_seq);
|
*opt_flags |= IPVS_OPT_F_SEQ_DATA;
|
return 0;
|
}
|
|
static int ip_vs_proc_str(__u8 *p, unsigned int plen, unsigned int *data_len,
|
__u8 **data, unsigned int maxlen,
|
__u32 *opt_flags, __u32 flag)
|
{
|
if (plen > maxlen) {
|
IP_VS_DBG(2, "BACKUP, bogus par.data len > %d\n", maxlen);
|
return -EINVAL;
|
}
|
if (*opt_flags & flag) {
|
IP_VS_DBG(2, "BACKUP, Par.data found twice 0x%x\n", flag);
|
return -EINVAL;
|
}
|
*data_len = plen;
|
*data = p;
|
*opt_flags |= flag;
|
return 0;
|
}
|
/*
|
* Process a Version 1 sync. connection
|
*/
|
static inline int ip_vs_proc_sync_conn(struct netns_ipvs *ipvs, __u8 *p, __u8 *msg_end)
|
{
|
struct ip_vs_sync_conn_options opt;
|
union ip_vs_sync_conn *s;
|
struct ip_vs_protocol *pp;
|
struct ip_vs_conn_param param;
|
__u32 flags;
|
unsigned int af, state, pe_data_len=0, pe_name_len=0;
|
__u8 *pe_data=NULL, *pe_name=NULL;
|
__u32 opt_flags=0;
|
int retc=0;
|
|
s = (union ip_vs_sync_conn *) p;
|
|
if (s->v6.type & STYPE_F_INET6) {
|
#ifdef CONFIG_IP_VS_IPV6
|
af = AF_INET6;
|
p += sizeof(struct ip_vs_sync_v6);
|
#else
|
IP_VS_DBG(3,"BACKUP, IPv6 msg received, and IPVS is not compiled for IPv6\n");
|
retc = 10;
|
goto out;
|
#endif
|
} else if (!s->v4.type) {
|
af = AF_INET;
|
p += sizeof(struct ip_vs_sync_v4);
|
} else {
|
return -10;
|
}
|
if (p > msg_end)
|
return -20;
|
|
/* Process optional params check Type & Len. */
|
while (p < msg_end) {
|
int ptype;
|
int plen;
|
|
if (p+2 > msg_end)
|
return -30;
|
ptype = *(p++);
|
plen = *(p++);
|
|
if (!plen || ((p + plen) > msg_end))
|
return -40;
|
/* Handle seq option p = param data */
|
switch (ptype & ~IPVS_OPT_F_PARAM) {
|
case IPVS_OPT_SEQ_DATA:
|
if (ip_vs_proc_seqopt(p, plen, &opt_flags, &opt))
|
return -50;
|
break;
|
|
case IPVS_OPT_PE_DATA:
|
if (ip_vs_proc_str(p, plen, &pe_data_len, &pe_data,
|
IP_VS_PEDATA_MAXLEN, &opt_flags,
|
IPVS_OPT_F_PE_DATA))
|
return -60;
|
break;
|
|
case IPVS_OPT_PE_NAME:
|
if (ip_vs_proc_str(p, plen,&pe_name_len, &pe_name,
|
IP_VS_PENAME_MAXLEN, &opt_flags,
|
IPVS_OPT_F_PE_NAME))
|
return -70;
|
break;
|
|
default:
|
/* Param data mandatory ? */
|
if (!(ptype & IPVS_OPT_F_PARAM)) {
|
IP_VS_DBG(3, "BACKUP, Unknown mandatory param %d found\n",
|
ptype & ~IPVS_OPT_F_PARAM);
|
retc = 20;
|
goto out;
|
}
|
}
|
p += plen; /* Next option */
|
}
|
|
/* Get flags and Mask off unsupported */
|
flags = ntohl(s->v4.flags) & IP_VS_CONN_F_BACKUP_MASK;
|
flags |= IP_VS_CONN_F_SYNC;
|
state = ntohs(s->v4.state);
|
|
if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
|
pp = ip_vs_proto_get(s->v4.protocol);
|
if (!pp) {
|
IP_VS_DBG(3,"BACKUP, Unsupported protocol %u\n",
|
s->v4.protocol);
|
retc = 30;
|
goto out;
|
}
|
if (state >= pp->num_states) {
|
IP_VS_DBG(3, "BACKUP, Invalid %s state %u\n",
|
pp->name, state);
|
retc = 40;
|
goto out;
|
}
|
} else {
|
if (state >= IP_VS_CTPL_S_LAST)
|
IP_VS_DBG(7, "BACKUP, Invalid tpl state %u\n",
|
state);
|
}
|
if (ip_vs_conn_fill_param_sync(ipvs, af, s, ¶m, pe_data,
|
pe_data_len, pe_name, pe_name_len)) {
|
retc = 50;
|
goto out;
|
}
|
/* If only IPv4, just silent skip IPv6 */
|
if (af == AF_INET)
|
ip_vs_proc_conn(ipvs, ¶m, flags, state, s->v4.protocol, af,
|
(union nf_inet_addr *)&s->v4.daddr, s->v4.dport,
|
ntohl(s->v4.timeout), ntohl(s->v4.fwmark),
|
(opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
|
);
|
#ifdef CONFIG_IP_VS_IPV6
|
else
|
ip_vs_proc_conn(ipvs, ¶m, flags, state, s->v6.protocol, af,
|
(union nf_inet_addr *)&s->v6.daddr, s->v6.dport,
|
ntohl(s->v6.timeout), ntohl(s->v6.fwmark),
|
(opt_flags & IPVS_OPT_F_SEQ_DATA ? &opt : NULL)
|
);
|
#endif
|
ip_vs_pe_put(param.pe);
|
return 0;
|
/* Error exit */
|
out:
|
IP_VS_DBG(2, "BACKUP, Single msg dropped err:%d\n", retc);
|
return retc;
|
|
}
|
/*
|
* Process received multicast message and create the corresponding
|
* ip_vs_conn entries.
|
* Handles Version 0 & 1
|
*/
|
static void ip_vs_process_message(struct netns_ipvs *ipvs, __u8 *buffer,
|
const size_t buflen)
|
{
|
struct ip_vs_sync_mesg *m2 = (struct ip_vs_sync_mesg *)buffer;
|
__u8 *p, *msg_end;
|
int i, nr_conns;
|
|
if (buflen < sizeof(struct ip_vs_sync_mesg_v0)) {
|
IP_VS_DBG(2, "BACKUP, message header too short\n");
|
return;
|
}
|
|
if (buflen != ntohs(m2->size)) {
|
IP_VS_DBG(2, "BACKUP, bogus message size\n");
|
return;
|
}
|
/* SyncID sanity check */
|
if (ipvs->bcfg.syncid != 0 && m2->syncid != ipvs->bcfg.syncid) {
|
IP_VS_DBG(7, "BACKUP, Ignoring syncid = %d\n", m2->syncid);
|
return;
|
}
|
/* Handle version 1 message */
|
if ((m2->version == SYNC_PROTO_VER) && (m2->reserved == 0)
|
&& (m2->spare == 0)) {
|
|
msg_end = buffer + sizeof(struct ip_vs_sync_mesg);
|
nr_conns = m2->nr_conns;
|
|
for (i=0; i<nr_conns; i++) {
|
union ip_vs_sync_conn *s;
|
unsigned int size;
|
int retc;
|
|
p = msg_end;
|
if (p + sizeof(s->v4) > buffer+buflen) {
|
IP_VS_ERR_RL("BACKUP, Dropping buffer, too small\n");
|
return;
|
}
|
s = (union ip_vs_sync_conn *)p;
|
size = ntohs(s->v4.ver_size) & SVER_MASK;
|
msg_end = p + size;
|
/* Basic sanity checks */
|
if (msg_end > buffer+buflen) {
|
IP_VS_ERR_RL("BACKUP, Dropping buffer, msg > buffer\n");
|
return;
|
}
|
if (ntohs(s->v4.ver_size) >> SVER_SHIFT) {
|
IP_VS_ERR_RL("BACKUP, Dropping buffer, Unknown version %d\n",
|
ntohs(s->v4.ver_size) >> SVER_SHIFT);
|
return;
|
}
|
/* Process a single sync_conn */
|
retc = ip_vs_proc_sync_conn(ipvs, p, msg_end);
|
if (retc < 0) {
|
IP_VS_ERR_RL("BACKUP, Dropping buffer, Err: %d in decoding\n",
|
retc);
|
return;
|
}
|
/* Make sure we have 32 bit alignment */
|
msg_end = p + ((size + 3) & ~3);
|
}
|
} else {
|
/* Old type of message */
|
ip_vs_process_message_v0(ipvs, buffer, buflen);
|
return;
|
}
|
}
|
|
|
/*
|
* Setup sndbuf (mode=1) or rcvbuf (mode=0)
|
*/
|
static void set_sock_size(struct sock *sk, int mode, int val)
|
{
|
/* setsockopt(sock, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)); */
|
/* setsockopt(sock, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)); */
|
lock_sock(sk);
|
if (mode) {
|
val = clamp_t(int, val, (SOCK_MIN_SNDBUF + 1) / 2,
|
READ_ONCE(sysctl_wmem_max));
|
sk->sk_sndbuf = val * 2;
|
sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
|
} else {
|
val = clamp_t(int, val, (SOCK_MIN_RCVBUF + 1) / 2,
|
READ_ONCE(sysctl_rmem_max));
|
sk->sk_rcvbuf = val * 2;
|
sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
|
}
|
release_sock(sk);
|
}
|
|
/*
|
* Setup loopback of outgoing multicasts on a sending socket
|
*/
|
static void set_mcast_loop(struct sock *sk, u_char loop)
|
{
|
struct inet_sock *inet = inet_sk(sk);
|
|
/* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */
|
lock_sock(sk);
|
inet->mc_loop = loop ? 1 : 0;
|
#ifdef CONFIG_IP_VS_IPV6
|
if (sk->sk_family == AF_INET6) {
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
/* IPV6_MULTICAST_LOOP */
|
np->mc_loop = loop ? 1 : 0;
|
}
|
#endif
|
release_sock(sk);
|
}
|
|
/*
|
* Specify TTL for outgoing multicasts on a sending socket
|
*/
|
static void set_mcast_ttl(struct sock *sk, u_char ttl)
|
{
|
struct inet_sock *inet = inet_sk(sk);
|
|
/* setsockopt(sock, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)); */
|
lock_sock(sk);
|
inet->mc_ttl = ttl;
|
#ifdef CONFIG_IP_VS_IPV6
|
if (sk->sk_family == AF_INET6) {
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
/* IPV6_MULTICAST_HOPS */
|
np->mcast_hops = ttl;
|
}
|
#endif
|
release_sock(sk);
|
}
|
|
/* Control fragmentation of messages */
|
static void set_mcast_pmtudisc(struct sock *sk, int val)
|
{
|
struct inet_sock *inet = inet_sk(sk);
|
|
/* setsockopt(sock, SOL_IP, IP_MTU_DISCOVER, &val, sizeof(val)); */
|
lock_sock(sk);
|
inet->pmtudisc = val;
|
#ifdef CONFIG_IP_VS_IPV6
|
if (sk->sk_family == AF_INET6) {
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
/* IPV6_MTU_DISCOVER */
|
np->pmtudisc = val;
|
}
|
#endif
|
release_sock(sk);
|
}
|
|
/*
|
* Specifiy default interface for outgoing multicasts
|
*/
|
static int set_mcast_if(struct sock *sk, struct net_device *dev)
|
{
|
struct inet_sock *inet = inet_sk(sk);
|
|
if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
|
return -EINVAL;
|
|
lock_sock(sk);
|
inet->mc_index = dev->ifindex;
|
/* inet->mc_addr = 0; */
|
#ifdef CONFIG_IP_VS_IPV6
|
if (sk->sk_family == AF_INET6) {
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
/* IPV6_MULTICAST_IF */
|
np->mcast_oif = dev->ifindex;
|
}
|
#endif
|
release_sock(sk);
|
|
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, struct net_device *dev)
|
{
|
struct ip_mreqn mreq;
|
int ret;
|
|
memset(&mreq, 0, sizeof(mreq));
|
memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr));
|
|
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;
|
}
|
|
#ifdef CONFIG_IP_VS_IPV6
|
static int join_mcast_group6(struct sock *sk, struct in6_addr *addr,
|
struct net_device *dev)
|
{
|
int ret;
|
|
if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if)
|
return -EINVAL;
|
|
lock_sock(sk);
|
ret = ipv6_sock_mc_join(sk, dev->ifindex, addr);
|
release_sock(sk);
|
|
return ret;
|
}
|
#endif
|
|
static int bind_mcastif_addr(struct socket *sock, struct net_device *dev)
|
{
|
__be32 addr;
|
struct sockaddr_in sin;
|
|
addr = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE);
|
if (!addr)
|
pr_err("You probably need to specify IP address on "
|
"multicast interface.\n");
|
|
IP_VS_DBG(7, "binding socket with (%s) %pI4\n",
|
dev->name, &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));
|
}
|
|
static void get_mcast_sockaddr(union ipvs_sockaddr *sa, int *salen,
|
struct ipvs_sync_daemon_cfg *c, int id)
|
{
|
if (AF_INET6 == c->mcast_af) {
|
sa->in6 = (struct sockaddr_in6) {
|
.sin6_family = AF_INET6,
|
.sin6_port = htons(c->mcast_port + id),
|
};
|
sa->in6.sin6_addr = c->mcast_group.in6;
|
*salen = sizeof(sa->in6);
|
} else {
|
sa->in = (struct sockaddr_in) {
|
.sin_family = AF_INET,
|
.sin_port = htons(c->mcast_port + id),
|
};
|
sa->in.sin_addr = c->mcast_group.in;
|
*salen = sizeof(sa->in);
|
}
|
}
|
|
/*
|
* Set up sending multicast socket over UDP
|
*/
|
static int make_send_sock(struct netns_ipvs *ipvs, int id,
|
struct net_device *dev, struct socket **sock_ret)
|
{
|
/* multicast addr */
|
union ipvs_sockaddr mcast_addr;
|
struct socket *sock;
|
int result, salen;
|
|
/* First create a socket */
|
result = sock_create_kern(ipvs->net, ipvs->mcfg.mcast_af, SOCK_DGRAM,
|
IPPROTO_UDP, &sock);
|
if (result < 0) {
|
pr_err("Error during creation of socket; terminating\n");
|
goto error;
|
}
|
*sock_ret = sock;
|
result = set_mcast_if(sock->sk, dev);
|
if (result < 0) {
|
pr_err("Error setting outbound mcast interface\n");
|
goto error;
|
}
|
|
set_mcast_loop(sock->sk, 0);
|
set_mcast_ttl(sock->sk, ipvs->mcfg.mcast_ttl);
|
/* Allow fragmentation if MTU changes */
|
set_mcast_pmtudisc(sock->sk, IP_PMTUDISC_DONT);
|
result = sysctl_sync_sock_size(ipvs);
|
if (result > 0)
|
set_sock_size(sock->sk, 1, result);
|
|
if (AF_INET == ipvs->mcfg.mcast_af)
|
result = bind_mcastif_addr(sock, dev);
|
else
|
result = 0;
|
if (result < 0) {
|
pr_err("Error binding address of the mcast interface\n");
|
goto error;
|
}
|
|
get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->mcfg, id);
|
result = sock->ops->connect(sock, (struct sockaddr *) &mcast_addr,
|
salen, 0);
|
if (result < 0) {
|
pr_err("Error connecting to the multicast addr\n");
|
goto error;
|
}
|
|
return 0;
|
|
error:
|
return result;
|
}
|
|
|
/*
|
* Set up receiving multicast socket over UDP
|
*/
|
static int make_receive_sock(struct netns_ipvs *ipvs, int id,
|
struct net_device *dev, struct socket **sock_ret)
|
{
|
/* multicast addr */
|
union ipvs_sockaddr mcast_addr;
|
struct socket *sock;
|
int result, salen;
|
|
/* First create a socket */
|
result = sock_create_kern(ipvs->net, ipvs->bcfg.mcast_af, SOCK_DGRAM,
|
IPPROTO_UDP, &sock);
|
if (result < 0) {
|
pr_err("Error during creation of socket; terminating\n");
|
goto error;
|
}
|
*sock_ret = sock;
|
/* it is equivalent to the REUSEADDR option in user-space */
|
sock->sk->sk_reuse = SK_CAN_REUSE;
|
result = sysctl_sync_sock_size(ipvs);
|
if (result > 0)
|
set_sock_size(sock->sk, 0, result);
|
|
get_mcast_sockaddr(&mcast_addr, &salen, &ipvs->bcfg, id);
|
sock->sk->sk_bound_dev_if = dev->ifindex;
|
result = sock->ops->bind(sock, (struct sockaddr *)&mcast_addr, salen);
|
if (result < 0) {
|
pr_err("Error binding to the multicast addr\n");
|
goto error;
|
}
|
|
/* join the multicast group */
|
#ifdef CONFIG_IP_VS_IPV6
|
if (ipvs->bcfg.mcast_af == AF_INET6)
|
result = join_mcast_group6(sock->sk, &mcast_addr.in6.sin6_addr,
|
dev);
|
else
|
#endif
|
result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr,
|
dev);
|
if (result < 0) {
|
pr_err("Error joining to the multicast group\n");
|
goto error;
|
}
|
|
return 0;
|
|
error:
|
return 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 int
|
ip_vs_send_sync_msg(struct socket *sock, struct ip_vs_sync_mesg *msg)
|
{
|
int msize;
|
int ret;
|
|
msize = ntohs(msg->size);
|
|
ret = ip_vs_send_async(sock, (char *)msg, msize);
|
if (ret >= 0 || ret == -EAGAIN)
|
return ret;
|
pr_err("ip_vs_send_async error %d\n", ret);
|
return 0;
|
}
|
|
static int
|
ip_vs_receive(struct socket *sock, char *buffer, const size_t buflen)
|
{
|
struct msghdr msg = {NULL,};
|
struct kvec iov = {buffer, buflen};
|
int len;
|
|
EnterFunction(7);
|
|
/* Receive a packet */
|
iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, buflen);
|
len = sock_recvmsg(sock, &msg, MSG_DONTWAIT);
|
if (len < 0)
|
return len;
|
|
LeaveFunction(7);
|
return len;
|
}
|
|
/* Wakeup the master thread for sending */
|
static void master_wakeup_work_handler(struct work_struct *work)
|
{
|
struct ipvs_master_sync_state *ms =
|
container_of(work, struct ipvs_master_sync_state,
|
master_wakeup_work.work);
|
struct netns_ipvs *ipvs = ms->ipvs;
|
|
spin_lock_bh(&ipvs->sync_lock);
|
if (ms->sync_queue_len &&
|
ms->sync_queue_delay < IPVS_SYNC_WAKEUP_RATE) {
|
int id = (int)(ms - ipvs->ms);
|
|
ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE;
|
wake_up_process(ipvs->master_tinfo[id].task);
|
}
|
spin_unlock_bh(&ipvs->sync_lock);
|
}
|
|
/* Get next buffer to send */
|
static inline struct ip_vs_sync_buff *
|
next_sync_buff(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms)
|
{
|
struct ip_vs_sync_buff *sb;
|
|
sb = sb_dequeue(ipvs, ms);
|
if (sb)
|
return sb;
|
/* Do not delay entries in buffer for more than 2 seconds */
|
return get_curr_sync_buff(ipvs, ms, IPVS_SYNC_FLUSH_TIME);
|
}
|
|
static int sync_thread_master(void *data)
|
{
|
struct ip_vs_sync_thread_data *tinfo = data;
|
struct netns_ipvs *ipvs = tinfo->ipvs;
|
struct ipvs_master_sync_state *ms = &ipvs->ms[tinfo->id];
|
struct sock *sk = tinfo->sock->sk;
|
struct ip_vs_sync_buff *sb;
|
|
pr_info("sync thread started: state = MASTER, mcast_ifn = %s, "
|
"syncid = %d, id = %d\n",
|
ipvs->mcfg.mcast_ifn, ipvs->mcfg.syncid, tinfo->id);
|
|
for (;;) {
|
sb = next_sync_buff(ipvs, ms);
|
if (unlikely(kthread_should_stop()))
|
break;
|
if (!sb) {
|
schedule_timeout(IPVS_SYNC_CHECK_PERIOD);
|
continue;
|
}
|
while (ip_vs_send_sync_msg(tinfo->sock, sb->mesg) < 0) {
|
/* (Ab)use interruptible sleep to avoid increasing
|
* the load avg.
|
*/
|
__wait_event_interruptible(*sk_sleep(sk),
|
sock_writeable(sk) ||
|
kthread_should_stop());
|
if (unlikely(kthread_should_stop()))
|
goto done;
|
}
|
ip_vs_sync_buff_release(sb);
|
}
|
|
done:
|
__set_current_state(TASK_RUNNING);
|
if (sb)
|
ip_vs_sync_buff_release(sb);
|
|
/* clean up the sync_buff queue */
|
while ((sb = sb_dequeue(ipvs, ms)))
|
ip_vs_sync_buff_release(sb);
|
__set_current_state(TASK_RUNNING);
|
|
/* clean up the current sync_buff */
|
sb = get_curr_sync_buff(ipvs, ms, 0);
|
if (sb)
|
ip_vs_sync_buff_release(sb);
|
|
return 0;
|
}
|
|
|
static int sync_thread_backup(void *data)
|
{
|
struct ip_vs_sync_thread_data *tinfo = data;
|
struct netns_ipvs *ipvs = tinfo->ipvs;
|
struct sock *sk = tinfo->sock->sk;
|
struct udp_sock *up = udp_sk(sk);
|
int len;
|
|
pr_info("sync thread started: state = BACKUP, mcast_ifn = %s, "
|
"syncid = %d, id = %d\n",
|
ipvs->bcfg.mcast_ifn, ipvs->bcfg.syncid, tinfo->id);
|
|
while (!kthread_should_stop()) {
|
wait_event_interruptible(*sk_sleep(sk),
|
!skb_queue_empty_lockless(&sk->sk_receive_queue) ||
|
!skb_queue_empty_lockless(&up->reader_queue) ||
|
kthread_should_stop());
|
|
/* do we have data now? */
|
while (!skb_queue_empty_lockless(&sk->sk_receive_queue) ||
|
!skb_queue_empty_lockless(&up->reader_queue)) {
|
len = ip_vs_receive(tinfo->sock, tinfo->buf,
|
ipvs->bcfg.sync_maxlen);
|
if (len <= 0) {
|
if (len != -EAGAIN)
|
pr_err("receiving message error\n");
|
break;
|
}
|
|
ip_vs_process_message(ipvs, tinfo->buf, len);
|
}
|
}
|
|
return 0;
|
}
|
|
|
int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c,
|
int state)
|
{
|
struct ip_vs_sync_thread_data *ti = NULL, *tinfo;
|
struct task_struct *task;
|
struct net_device *dev;
|
char *name;
|
int (*threadfn)(void *data);
|
int id = 0, count, hlen;
|
int result = -ENOMEM;
|
u16 mtu, min_mtu;
|
|
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_v0));
|
|
/* increase the module use count */
|
if (!ip_vs_use_count_inc())
|
return -ENOPROTOOPT;
|
|
/* Do not hold one mutex and then to block on another */
|
for (;;) {
|
rtnl_lock();
|
if (mutex_trylock(&ipvs->sync_mutex))
|
break;
|
rtnl_unlock();
|
mutex_lock(&ipvs->sync_mutex);
|
if (rtnl_trylock())
|
break;
|
mutex_unlock(&ipvs->sync_mutex);
|
}
|
|
if (!ipvs->sync_state) {
|
count = clamp(sysctl_sync_ports(ipvs), 1, IPVS_SYNC_PORTS_MAX);
|
ipvs->threads_mask = count - 1;
|
} else
|
count = ipvs->threads_mask + 1;
|
|
if (c->mcast_af == AF_UNSPEC) {
|
c->mcast_af = AF_INET;
|
c->mcast_group.ip = cpu_to_be32(IP_VS_SYNC_GROUP);
|
}
|
if (!c->mcast_port)
|
c->mcast_port = IP_VS_SYNC_PORT;
|
if (!c->mcast_ttl)
|
c->mcast_ttl = 1;
|
|
dev = __dev_get_by_name(ipvs->net, c->mcast_ifn);
|
if (!dev) {
|
pr_err("Unknown mcast interface: %s\n", c->mcast_ifn);
|
result = -ENODEV;
|
goto out_early;
|
}
|
hlen = (AF_INET6 == c->mcast_af) ?
|
sizeof(struct ipv6hdr) + sizeof(struct udphdr) :
|
sizeof(struct iphdr) + sizeof(struct udphdr);
|
mtu = (state == IP_VS_STATE_BACKUP) ?
|
clamp(dev->mtu, 1500U, 65535U) : 1500U;
|
min_mtu = (state == IP_VS_STATE_BACKUP) ? 1024 : 1;
|
|
if (c->sync_maxlen)
|
c->sync_maxlen = clamp_t(unsigned int,
|
c->sync_maxlen, min_mtu,
|
65535 - hlen);
|
else
|
c->sync_maxlen = mtu - hlen;
|
|
if (state == IP_VS_STATE_MASTER) {
|
result = -EEXIST;
|
if (ipvs->ms)
|
goto out_early;
|
|
ipvs->mcfg = *c;
|
name = "ipvs-m:%d:%d";
|
threadfn = sync_thread_master;
|
} else if (state == IP_VS_STATE_BACKUP) {
|
result = -EEXIST;
|
if (ipvs->backup_tinfo)
|
goto out_early;
|
|
ipvs->bcfg = *c;
|
name = "ipvs-b:%d:%d";
|
threadfn = sync_thread_backup;
|
} else {
|
result = -EINVAL;
|
goto out_early;
|
}
|
|
if (state == IP_VS_STATE_MASTER) {
|
struct ipvs_master_sync_state *ms;
|
|
result = -ENOMEM;
|
ipvs->ms = kcalloc(count, sizeof(ipvs->ms[0]), GFP_KERNEL);
|
if (!ipvs->ms)
|
goto out;
|
ms = ipvs->ms;
|
for (id = 0; id < count; id++, ms++) {
|
INIT_LIST_HEAD(&ms->sync_queue);
|
ms->sync_queue_len = 0;
|
ms->sync_queue_delay = 0;
|
INIT_DELAYED_WORK(&ms->master_wakeup_work,
|
master_wakeup_work_handler);
|
ms->ipvs = ipvs;
|
}
|
}
|
result = -ENOMEM;
|
ti = kcalloc(count, sizeof(struct ip_vs_sync_thread_data),
|
GFP_KERNEL);
|
if (!ti)
|
goto out;
|
|
for (id = 0; id < count; id++) {
|
tinfo = &ti[id];
|
tinfo->ipvs = ipvs;
|
if (state == IP_VS_STATE_BACKUP) {
|
result = -ENOMEM;
|
tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen,
|
GFP_KERNEL);
|
if (!tinfo->buf)
|
goto out;
|
}
|
tinfo->id = id;
|
if (state == IP_VS_STATE_MASTER)
|
result = make_send_sock(ipvs, id, dev, &tinfo->sock);
|
else
|
result = make_receive_sock(ipvs, id, dev, &tinfo->sock);
|
if (result < 0)
|
goto out;
|
|
task = kthread_run(threadfn, tinfo, name, ipvs->gen, id);
|
if (IS_ERR(task)) {
|
result = PTR_ERR(task);
|
goto out;
|
}
|
tinfo->task = task;
|
}
|
|
/* mark as active */
|
|
if (state == IP_VS_STATE_MASTER)
|
ipvs->master_tinfo = ti;
|
else
|
ipvs->backup_tinfo = ti;
|
spin_lock_bh(&ipvs->sync_buff_lock);
|
ipvs->sync_state |= state;
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
|
mutex_unlock(&ipvs->sync_mutex);
|
rtnl_unlock();
|
|
return 0;
|
|
out:
|
/* We do not need RTNL lock anymore, release it here so that
|
* sock_release below can use rtnl_lock to leave the mcast group.
|
*/
|
rtnl_unlock();
|
id = min(id, count - 1);
|
if (ti) {
|
for (tinfo = ti + id; tinfo >= ti; tinfo--) {
|
if (tinfo->task)
|
kthread_stop(tinfo->task);
|
}
|
}
|
if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) {
|
kfree(ipvs->ms);
|
ipvs->ms = NULL;
|
}
|
mutex_unlock(&ipvs->sync_mutex);
|
|
/* No more mutexes, release socks */
|
if (ti) {
|
for (tinfo = ti + id; tinfo >= ti; tinfo--) {
|
if (tinfo->sock)
|
sock_release(tinfo->sock);
|
kfree(tinfo->buf);
|
}
|
kfree(ti);
|
}
|
|
/* decrease the module use count */
|
ip_vs_use_count_dec();
|
return result;
|
|
out_early:
|
mutex_unlock(&ipvs->sync_mutex);
|
rtnl_unlock();
|
|
/* decrease the module use count */
|
ip_vs_use_count_dec();
|
return result;
|
}
|
|
|
int stop_sync_thread(struct netns_ipvs *ipvs, int state)
|
{
|
struct ip_vs_sync_thread_data *ti, *tinfo;
|
int id;
|
int retc = -EINVAL;
|
|
IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current));
|
|
mutex_lock(&ipvs->sync_mutex);
|
if (state == IP_VS_STATE_MASTER) {
|
retc = -ESRCH;
|
if (!ipvs->ms)
|
goto err;
|
ti = ipvs->master_tinfo;
|
|
/*
|
* 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(&ipvs->sync_buff_lock);
|
spin_lock(&ipvs->sync_lock);
|
ipvs->sync_state &= ~IP_VS_STATE_MASTER;
|
spin_unlock(&ipvs->sync_lock);
|
spin_unlock_bh(&ipvs->sync_buff_lock);
|
|
retc = 0;
|
for (id = ipvs->threads_mask; id >= 0; id--) {
|
struct ipvs_master_sync_state *ms = &ipvs->ms[id];
|
int ret;
|
|
tinfo = &ti[id];
|
pr_info("stopping master sync thread %d ...\n",
|
task_pid_nr(tinfo->task));
|
cancel_delayed_work_sync(&ms->master_wakeup_work);
|
ret = kthread_stop(tinfo->task);
|
if (retc >= 0)
|
retc = ret;
|
}
|
kfree(ipvs->ms);
|
ipvs->ms = NULL;
|
ipvs->master_tinfo = NULL;
|
} else if (state == IP_VS_STATE_BACKUP) {
|
retc = -ESRCH;
|
if (!ipvs->backup_tinfo)
|
goto err;
|
ti = ipvs->backup_tinfo;
|
|
ipvs->sync_state &= ~IP_VS_STATE_BACKUP;
|
retc = 0;
|
for (id = ipvs->threads_mask; id >= 0; id--) {
|
int ret;
|
|
tinfo = &ti[id];
|
pr_info("stopping backup sync thread %d ...\n",
|
task_pid_nr(tinfo->task));
|
ret = kthread_stop(tinfo->task);
|
if (retc >= 0)
|
retc = ret;
|
}
|
ipvs->backup_tinfo = NULL;
|
} else {
|
goto err;
|
}
|
id = ipvs->threads_mask;
|
mutex_unlock(&ipvs->sync_mutex);
|
|
/* No more mutexes, release socks */
|
for (tinfo = ti + id; tinfo >= ti; tinfo--) {
|
if (tinfo->sock)
|
sock_release(tinfo->sock);
|
kfree(tinfo->buf);
|
}
|
kfree(ti);
|
|
/* decrease the module use count */
|
ip_vs_use_count_dec();
|
return retc;
|
|
err:
|
mutex_unlock(&ipvs->sync_mutex);
|
return retc;
|
}
|
|
/*
|
* Initialize data struct for each netns
|
*/
|
int __net_init ip_vs_sync_net_init(struct netns_ipvs *ipvs)
|
{
|
__mutex_init(&ipvs->sync_mutex, "ipvs->sync_mutex", &__ipvs_sync_key);
|
spin_lock_init(&ipvs->sync_lock);
|
spin_lock_init(&ipvs->sync_buff_lock);
|
return 0;
|
}
|
|
void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs)
|
{
|
int retc;
|
|
retc = stop_sync_thread(ipvs, IP_VS_STATE_MASTER);
|
if (retc && retc != -ESRCH)
|
pr_err("Failed to stop Master Daemon\n");
|
|
retc = stop_sync_thread(ipvs, IP_VS_STATE_BACKUP);
|
if (retc && retc != -ESRCH)
|
pr_err("Failed to stop Backup Daemon\n");
|
}
|
