diff options
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_sync.c')
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_sync.c | 2044 |
1 files changed, 2044 insertions, 0 deletions
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c new file mode 100644 index 000000000..4174076c6 --- /dev/null +++ b/net/netfilter/ipvs/ip_vs_sync.c @@ -0,0 +1,2044 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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 <linux/sched/signal.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 task_struct *task; + struct netns_ipvs *ipvs; + 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) | +*/ + +/* 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) +{ + memset(ho, 0, sizeof(*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) { + 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->sync_conn_opt, 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_inc_return(&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_inc_return(&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) +{ + /* setsockopt(sock, SOL_IP, IP_MULTICAST_LOOP, &loop, sizeof(loop)); */ + lock_sock(sk); + inet_assign_bit(MC_LOOP, sk, loop); +#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 kernel_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 = kernel_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 = kernel_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; + + iov.iov_base = (void *)buffer; + iov.iov_len = length; + + len = kernel_sendmsg(sock, &msg, &iov, 1, (size_t)(length)); + + 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; + + /* Receive a packet */ + iov_iter_kvec(&msg.msg_iter, ITER_DEST, &iov, 1, buflen); + len = sock_recvmsg(sock, &msg, MSG_DONTWAIT); + if (len < 0) + return len; + + 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"); +} |