| /* |
| * IPVS An implementation of the IP virtual server support for the |
| * LINUX operating system. IPVS is now implemented as a module |
| * over the NetFilter framework. IPVS can be used to build a |
| * high-performance and highly available server based on a |
| * cluster of servers. |
| * |
| * Version 1, is capable of handling both version 0 and 1 messages. |
| * Version 0 is the plain old format. |
| * Note Version 0 receivers will just drop Ver 1 messages. |
| * Version 1 is capable of handle IPv6, Persistence data, |
| * time-outs, and firewall marks. |
| * In ver.1 "ip_vs_sync_conn_options" will be sent in netw. order. |
| * Ver. 0 can be turned on by sysctl -w net.ipv4.vs.sync_version=0 |
| * |
| * Definitions Message: is a complete datagram |
| * Sync_conn: is a part of a Message |
| * Param Data is an option to a Sync_conn. |
| * |
| * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| * |
| * ip_vs_sync: sync connection info from master load balancer to backups |
| * through multicast |
| * |
| * Changes: |
| * Alexandre Cassen : Added master & backup support at a time. |
| * Alexandre Cassen : Added SyncID support for incoming sync |
| * messages filtering. |
| * Justin Ossevoort : Fix endian problem on sync message size. |
| * Hans Schillstrom : Added Version 1: i.e. IPv6, |
| * Persistence support, fwmark and time-out. |
| */ |
| |
| #define KMSG_COMPONENT "IPVS" |
| #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/inetdevice.h> |
| #include <linux/net.h> |
| #include <linux/completion.h> |
| #include <linux/delay.h> |
| #include <linux/skbuff.h> |
| #include <linux/in.h> |
| #include <linux/igmp.h> /* for ip_mc_join_group */ |
| #include <linux/udp.h> |
| #include <linux/err.h> |
| #include <linux/kthread.h> |
| #include <linux/wait.h> |
| #include <linux/kernel.h> |
| |
| #include <asm/unaligned.h> /* Used for ntoh_seq and hton_seq */ |
| |
| #include <net/ip.h> |
| #include <net/sock.h> |
| |
| #include <net/ip_vs.h> |
| |
| #define IP_VS_SYNC_GROUP 0xe0000051 /* multicast addr - 224.0.0.81 */ |
| #define IP_VS_SYNC_PORT 8848 /* multicast port */ |
| |
| #define SYNC_PROTO_VER 1 /* Protocol version in header */ |
| |
| static struct lock_class_key __ipvs_sync_key; |
| /* |
| * IPVS sync connection entry |
| * Version 0, i.e. original version. |
| */ |
| struct ip_vs_sync_conn_v0 { |
| __u8 reserved; |
| |
| /* Protocol, addresses and port numbers */ |
| __u8 protocol; /* Which protocol (TCP/UDP) */ |
| __be16 cport; |
| __be16 vport; |
| __be16 dport; |
| __be32 caddr; /* client address */ |
| __be32 vaddr; /* virtual address */ |
| __be32 daddr; /* destination address */ |
| |
| /* Flags and state transition */ |
| __be16 flags; /* status flags */ |
| __be16 state; /* state info */ |
| |
| /* The sequence options start here */ |
| }; |
| |
| struct ip_vs_sync_conn_options { |
| struct ip_vs_seq in_seq; /* incoming seq. struct */ |
| struct ip_vs_seq out_seq; /* outgoing seq. struct */ |
| }; |
| |
| /* |
| Sync Connection format (sync_conn) |
| |
| 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 |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Type | Protocol | Ver. | Size | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Flags | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | State | cport | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | vport | dport | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | fwmark | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | timeout (in sec.) | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | ... | |
| | IP-Addresses (v4 or v6) | |
| | ... | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| Optional Parameters. |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | Param. Type | Param. Length | Param. data | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
| | ... | |
| | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | | Param Type | Param. Length | |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| | 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 */ |
| /* 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 */ |
| __be32 caddr; /* client address */ |
| __be32 vaddr; /* virtual address */ |
| __be32 daddr; /* destination address */ |
| /* 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 */ |
| /* 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 */ |
| struct in6_addr caddr; /* client address */ |
| struct in6_addr vaddr; /* virtual address */ |
| struct in6_addr daddr; /* destination address */ |
| /* 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 |
| #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)) |
| #define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME-1)) |
| #define IPVS_OPT_F_PARAM (1 << (IPVS_OPT_PARAM-1)) |
| |
| struct ip_vs_sync_thread_data { |
| struct net *net; |
| struct socket *sock; |
| char *buf; |
| 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) | |
| */ |
| |
| #define SYNC_MESG_HEADER_LEN 4 |
| #define MAX_CONNS_PER_SYNCBUFF 255 /* nr_conns in ip_vs_sync_mesg is 8 bit */ |
| |
| /* 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 */ |
| struct ip_vs_sync_mesg { |
| __u8 reserved; /* must be zero */ |
| __u8 syncid; |
| __be16 size; |
| __u8 nr_conns; |
| __s8 version; /* SYNC_PROTO_VER */ |
| __u16 spare; |
| /* ip_vs_sync_conn entries start here */ |
| }; |
| |
| union ipvs_sockaddr { |
| struct sockaddr_in in; |
| struct sockaddr_in6 in6; |
| }; |
| |
| struct ip_vs_sync_buff { |
| struct list_head list; |
| unsigned long firstuse; |
| |
| /* pointers for the message data */ |
| struct ip_vs_sync_mesg *mesg; |
| unsigned char *head; |
| unsigned char *end; |
| }; |
| |
| /* |
| * Copy of struct ip_vs_seq |
| * From unaligned network order to aligned host order |
| */ |
| static void ntoh_seq(struct ip_vs_seq *no, struct ip_vs_seq *ho) |
| { |
| ho->init_seq = get_unaligned_be32(&no->init_seq); |
| ho->delta = get_unaligned_be32(&no->delta); |
| ho->previous_delta = get_unaligned_be32(&no->previous_delta); |
| } |
| |
| /* |
| * Copy of struct ip_vs_seq |
| * From Aligned host order to unaligned network order |
| */ |
| static void hton_seq(struct ip_vs_seq *ho, struct ip_vs_seq *no) |
| { |
| put_unaligned_be32(ho->init_seq, &no->init_seq); |
| put_unaligned_be32(ho->delta, &no->delta); |
| put_unaligned_be32(ho->previous_delta, &no->previous_delta); |
| } |
| |
| static inline struct ip_vs_sync_buff * |
| sb_dequeue(struct netns_ipvs *ipvs, struct ipvs_master_sync_state *ms) |
| { |
| struct ip_vs_sync_buff *sb; |
| |
| spin_lock_bh(&ipvs->sync_lock); |
| if (list_empty(&ms->sync_queue)) { |
| sb = NULL; |
| __set_current_state(TASK_INTERRUPTIBLE); |
| } else { |
| sb = list_entry(ms->sync_queue.next, struct ip_vs_sync_buff, |
| list); |
| list_del(&sb->list); |
| ms->sync_queue_len--; |
| if (!ms->sync_queue_len) |
| ms->sync_queue_delay = 0; |
| } |
| spin_unlock_bh(&ipvs->sync_lock); |
| |
| return sb; |
| } |
| |
| /* |
| * 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) |
| wake_up_process(ms->master_thread); |
| } 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 = ACCESS_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 <= 0 && |
| 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 net *net, struct ip_vs_conn *cp, |
| int pkts) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| 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(net, 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 net *net, struct ip_vs_conn *cp, int pkts) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| 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(net, 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 net *net, 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; |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| |
| 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) |
| memcpy(&cp->in_seq, opt, sizeof(*opt)); |
| 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 { |
| /* protocol in templates is not used for state/timeout */ |
| if (state > 0) { |
| IP_VS_DBG(2, "BACKUP v0, Invalid template state %u\n", |
| state); |
| state = 0; |
| } |
| } |
| |
| 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->net, ¶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 net *net, __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 { |
| /* protocol in templates is not used for state/timeout */ |
| if (state > 0) { |
| IP_VS_DBG(3, "BACKUP, Invalid template state %u\n", |
| state); |
| state = 0; |
| } |
| } |
| if (ip_vs_conn_fill_param_sync(net_ipvs(net), 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(net, ¶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(net, ¶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 net *net, __u8 *buffer, |
| const size_t buflen) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| 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, to 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(net, 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, |
| 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, |
| 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, char *ifname) |
| { |
| struct net_device *dev; |
| struct inet_sock *inet = inet_sk(sk); |
| struct net *net = sock_net(sk); |
| |
| dev = __dev_get_by_name(net, ifname); |
| if (!dev) |
| return -ENODEV; |
| |
| 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, char *ifname) |
| { |
| struct net *net = sock_net(sk); |
| struct ip_mreqn mreq; |
| struct net_device *dev; |
| int ret; |
| |
| memset(&mreq, 0, sizeof(mreq)); |
| memcpy(&mreq.imr_multiaddr, addr, sizeof(struct in_addr)); |
| |
| dev = __dev_get_by_name(net, ifname); |
| if (!dev) |
| return -ENODEV; |
| if (sk->sk_bound_dev_if && dev->ifindex != sk->sk_bound_dev_if) |
| return -EINVAL; |
| |
| mreq.imr_ifindex = dev->ifindex; |
| |
| lock_sock(sk); |
| ret = ip_mc_join_group(sk, &mreq); |
| release_sock(sk); |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_IP_VS_IPV6 |
| static int join_mcast_group6(struct sock *sk, struct in6_addr *addr, |
| char *ifname) |
| { |
| struct net *net = sock_net(sk); |
| struct net_device *dev; |
| int ret; |
| |
| dev = __dev_get_by_name(net, ifname); |
| if (!dev) |
| return -ENODEV; |
| 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, char *ifname) |
| { |
| struct net *net = sock_net(sock->sk); |
| struct net_device *dev; |
| __be32 addr; |
| struct sockaddr_in sin; |
| |
| dev = __dev_get_by_name(net, ifname); |
| if (!dev) |
| return -ENODEV; |
| |
| 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", |
| ifname, &addr); |
| |
| /* Now bind the socket with the address of multicast interface */ |
| sin.sin_family = AF_INET; |
| sin.sin_addr.s_addr = addr; |
| sin.sin_port = 0; |
| |
| return sock->ops->bind(sock, (struct sockaddr*)&sin, sizeof(sin)); |
| } |
| |
| 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 struct socket *make_send_sock(struct netns_ipvs *ipvs, int id) |
| { |
| /* 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"); |
| return ERR_PTR(result); |
| } |
| result = set_mcast_if(sock->sk, ipvs->mcfg.mcast_ifn); |
| 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, ipvs->mcfg.mcast_ifn); |
| 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 sock; |
| |
| error: |
| sock_release(sock); |
| return ERR_PTR(result); |
| } |
| |
| |
| /* |
| * Set up receiving multicast socket over UDP |
| */ |
| static struct socket *make_receive_sock(struct net *net, int id) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| /* multicast addr */ |
| union ipvs_sockaddr mcast_addr; |
| struct socket *sock; |
| int result, salen; |
| |
| /* First create a socket */ |
| result = sock_create_kern(net, ipvs->bcfg.mcast_af, SOCK_DGRAM, |
| IPPROTO_UDP, &sock); |
| if (result < 0) { |
| pr_err("Error during creation of socket; terminating\n"); |
| return ERR_PTR(result); |
| } |
| /* it is equivalent to the REUSEADDR option in user-space */ |
| sock->sk->sk_reuse = 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); |
| 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, |
| ipvs->bcfg.mcast_ifn); |
| else |
| #endif |
| result = join_mcast_group(sock->sk, &mcast_addr.in.sin_addr, |
| ipvs->bcfg.mcast_ifn); |
| if (result < 0) { |
| pr_err("Error joining to the multicast group\n"); |
| goto error; |
| } |
| |
| return sock; |
| |
| error: |
| sock_release(sock); |
| return ERR_PTR(result); |
| } |
| |
| |
| static int |
| ip_vs_send_async(struct socket *sock, const char *buffer, const size_t length) |
| { |
| struct msghdr msg = {.msg_flags = MSG_DONTWAIT|MSG_NOSIGNAL}; |
| struct kvec iov; |
| int len; |
| |
| EnterFunction(7); |
| iov.iov_base = (void *)buffer; |
| iov.iov_len = length; |
| |
| len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length)); |
| |
| LeaveFunction(7); |
| return len; |
| } |
| |
| static 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; |
| 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, 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) { |
| ms->sync_queue_delay = IPVS_SYNC_WAKEUP_RATE; |
| wake_up_process(ms->master_thread); |
| } |
| 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 = net_ipvs(tinfo->net); |
| 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); |
| |
| /* release the sending multicast socket */ |
| sock_release(tinfo->sock); |
| kfree(tinfo); |
| |
| return 0; |
| } |
| |
| |
| static int sync_thread_backup(void *data) |
| { |
| struct ip_vs_sync_thread_data *tinfo = data; |
| struct netns_ipvs *ipvs = net_ipvs(tinfo->net); |
| 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(tinfo->sock->sk), |
| !skb_queue_empty(&tinfo->sock->sk->sk_receive_queue) |
| || kthread_should_stop()); |
| |
| /* do we have data now? */ |
| while (!skb_queue_empty(&(tinfo->sock->sk->sk_receive_queue))) { |
| len = ip_vs_receive(tinfo->sock, tinfo->buf, |
| ipvs->bcfg.sync_maxlen); |
| if (len <= 0) { |
| if (len != -EAGAIN) |
| pr_err("receiving message error\n"); |
| break; |
| } |
| |
| ip_vs_process_message(tinfo->net, tinfo->buf, len); |
| } |
| } |
| |
| /* release the sending multicast socket */ |
| sock_release(tinfo->sock); |
| kfree(tinfo->buf); |
| kfree(tinfo); |
| |
| return 0; |
| } |
| |
| |
| int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *c, |
| int state) |
| { |
| struct ip_vs_sync_thread_data *tinfo; |
| struct task_struct **array = NULL, *task; |
| struct socket *sock; |
| struct net_device *dev; |
| char *name; |
| int (*threadfn)(void *data); |
| int id, 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)); |
| |
| 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); |
| return -ENODEV; |
| } |
| 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) { |
| if (ipvs->ms) |
| return -EEXIST; |
| |
| ipvs->mcfg = *c; |
| name = "ipvs-m:%d:%d"; |
| threadfn = sync_thread_master; |
| } else if (state == IP_VS_STATE_BACKUP) { |
| if (ipvs->backup_threads) |
| return -EEXIST; |
| |
| ipvs->bcfg = *c; |
| name = "ipvs-b:%d:%d"; |
| threadfn = sync_thread_backup; |
| } else { |
| return -EINVAL; |
| } |
| |
| if (state == IP_VS_STATE_MASTER) { |
| struct ipvs_master_sync_state *ms; |
| |
| ipvs->ms = kzalloc(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; |
| } |
| } else { |
| array = kzalloc(count * sizeof(struct task_struct *), |
| GFP_KERNEL); |
| if (!array) |
| goto out; |
| } |
| |
| tinfo = NULL; |
| for (id = 0; id < count; id++) { |
| if (state == IP_VS_STATE_MASTER) |
| sock = make_send_sock(ipvs, id); |
| else |
| sock = make_receive_sock(ipvs->net, id); |
| if (IS_ERR(sock)) { |
| result = PTR_ERR(sock); |
| goto outtinfo; |
| } |
| tinfo = kmalloc(sizeof(*tinfo), GFP_KERNEL); |
| if (!tinfo) |
| goto outsocket; |
| tinfo->net = ipvs->net; |
| tinfo->sock = sock; |
| if (state == IP_VS_STATE_BACKUP) { |
| tinfo->buf = kmalloc(ipvs->bcfg.sync_maxlen, |
| GFP_KERNEL); |
| if (!tinfo->buf) |
| goto outtinfo; |
| } else { |
| tinfo->buf = NULL; |
| } |
| tinfo->id = id; |
| |
| task = kthread_run(threadfn, tinfo, name, ipvs->gen, id); |
| if (IS_ERR(task)) { |
| result = PTR_ERR(task); |
| goto outtinfo; |
| } |
| tinfo = NULL; |
| if (state == IP_VS_STATE_MASTER) |
| ipvs->ms[id].master_thread = task; |
| else |
| array[id] = task; |
| } |
| |
| /* mark as active */ |
| |
| if (state == IP_VS_STATE_BACKUP) |
| ipvs->backup_threads = array; |
| spin_lock_bh(&ipvs->sync_buff_lock); |
| ipvs->sync_state |= state; |
| spin_unlock_bh(&ipvs->sync_buff_lock); |
| |
| /* increase the module use count */ |
| ip_vs_use_count_inc(); |
| |
| return 0; |
| |
| outsocket: |
| sock_release(sock); |
| |
| outtinfo: |
| if (tinfo) { |
| sock_release(tinfo->sock); |
| kfree(tinfo->buf); |
| kfree(tinfo); |
| } |
| count = id; |
| while (count-- > 0) { |
| if (state == IP_VS_STATE_MASTER) |
| kthread_stop(ipvs->ms[count].master_thread); |
| else |
| kthread_stop(array[count]); |
| } |
| kfree(array); |
| |
| out: |
| if (!(ipvs->sync_state & IP_VS_STATE_MASTER)) { |
| kfree(ipvs->ms); |
| ipvs->ms = NULL; |
| } |
| return result; |
| } |
| |
| |
| int stop_sync_thread(struct netns_ipvs *ipvs, int state) |
| { |
| struct task_struct **array; |
| int id; |
| int retc = -EINVAL; |
| |
| IP_VS_DBG(7, "%s(): pid %d\n", __func__, task_pid_nr(current)); |
| |
| if (state == IP_VS_STATE_MASTER) { |
| if (!ipvs->ms) |
| return -ESRCH; |
| |
| /* |
| * 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; |
| |
| pr_info("stopping master sync thread %d ...\n", |
| task_pid_nr(ms->master_thread)); |
| cancel_delayed_work_sync(&ms->master_wakeup_work); |
| ret = kthread_stop(ms->master_thread); |
| if (retc >= 0) |
| retc = ret; |
| } |
| kfree(ipvs->ms); |
| ipvs->ms = NULL; |
| } else if (state == IP_VS_STATE_BACKUP) { |
| if (!ipvs->backup_threads) |
| return -ESRCH; |
| |
| ipvs->sync_state &= ~IP_VS_STATE_BACKUP; |
| array = ipvs->backup_threads; |
| retc = 0; |
| for (id = ipvs->threads_mask; id >= 0; id--) { |
| int ret; |
| |
| pr_info("stopping backup sync thread %d ...\n", |
| task_pid_nr(array[id])); |
| ret = kthread_stop(array[id]); |
| if (retc >= 0) |
| retc = ret; |
| } |
| kfree(array); |
| ipvs->backup_threads = NULL; |
| } |
| |
| /* decrease the module use count */ |
| ip_vs_use_count_dec(); |
| |
| return retc; |
| } |
| |
| /* |
| * Initialize data struct for each netns |
| */ |
| int __net_init ip_vs_sync_net_init(struct net *net) |
| { |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| |
| __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 net *net) |
| { |
| int retc; |
| struct netns_ipvs *ipvs = net_ipvs(net); |
| |
| mutex_lock(&ipvs->sync_mutex); |
| 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"); |
| mutex_unlock(&ipvs->sync_mutex); |
| } |