diff options
author | Hans Schillstrom <hans.schillstrom@ericsson.com> | 2010-11-19 14:25:14 +0100 |
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committer | Simon Horman <horms@verge.net.au> | 2010-11-25 10:42:59 +0900 |
commit | b880c1f077000956b9f475d5f3b6c5e45ff2e342 (patch) | |
tree | 07df0f04625897f0ca86ea302efe94ae2cd8a5d2 /net/netfilter/ipvs/ip_vs_sync.c | |
parent | 986a075795339c5ea1122ce9290dfd5504252eb0 (diff) | |
download | op-kernel-dev-b880c1f077000956b9f475d5f3b6c5e45ff2e342.zip op-kernel-dev-b880c1f077000956b9f475d5f3b6c5e45ff2e342.tar.gz |
IPVS: Backup, adding version 0 sending capabilities
This patch adds a sysclt net.ipv4.vs.sync_version
that can be used to send sync msg in version 0 or 1 format.
sync_version value is logical,
Value 1 (default) New version
0 Plain old version
Signed-off-by: Hans Schillstrom <hans.schillstrom@ericsson.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_sync.c')
-rw-r--r-- | net/netfilter/ipvs/ip_vs_sync.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c index df5abf0..c1c167a 100644 --- a/net/netfilter/ipvs/ip_vs_sync.c +++ b/net/netfilter/ipvs/ip_vs_sync.c @@ -5,6 +5,18 @@ * 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 @@ -15,6 +27,8 @@ * 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" @@ -392,6 +406,121 @@ get_curr_sync_buff(unsigned long time) } /* + * Switch mode from sending version 0 or 1 + * - must handle sync_buf + */ +void ip_vs_sync_switch_mode(int mode) { + + if (!ip_vs_sync_state & IP_VS_STATE_MASTER) + return; + if (mode == sysctl_ip_vs_sync_ver || !curr_sb) + return; + + spin_lock_bh(&curr_sb_lock); + /* Buffer empty ? then let buf_create do the job */ + if ( curr_sb->mesg->size <= sizeof(struct ip_vs_sync_mesg)) { + kfree(curr_sb); + curr_sb = NULL; + } else { + spin_lock_bh(&ip_vs_sync_lock); + if (ip_vs_sync_state & IP_VS_STATE_MASTER) + list_add_tail(&curr_sb->list, &ip_vs_sync_queue); + else + ip_vs_sync_buff_release(curr_sb); + spin_unlock_bh(&ip_vs_sync_lock); + } + spin_unlock_bh(&curr_sb_lock); +} + +/* + * Create a new sync buffer for Version 0 proto. + */ +static inline struct ip_vs_sync_buff * ip_vs_sync_buff_create_v0(void) +{ + 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; + + if (!(sb->mesg=kmalloc(sync_send_mesg_maxlen, GFP_ATOMIC))) { + kfree(sb); + return NULL; + } + mesg = (struct ip_vs_sync_mesg_v0 *)sb->mesg; + mesg->nr_conns = 0; + mesg->syncid = ip_vs_master_syncid; + mesg->size = 4; + sb->head = (unsigned char *)mesg + 4; + sb->end = (unsigned char *)mesg + sync_send_mesg_maxlen; + sb->firstuse = jiffies; + return sb; +} + +/* + * Version 0 , could be switched in by sys_ctl. + * Add an ip_vs_conn information into the current sync_buff. + */ +void ip_vs_sync_conn_v0(struct ip_vs_conn *cp) +{ + struct ip_vs_sync_mesg_v0 *m; + struct ip_vs_sync_conn_v0 *s; + int len; + + if (unlikely(cp->af != AF_INET)) + return; + /* Do not sync ONE PACKET */ + if (cp->flags & IP_VS_CONN_F_ONE_PACKET) + return; + + spin_lock(&curr_sb_lock); + if (!curr_sb) { + if (!(curr_sb=ip_vs_sync_buff_create_v0())) { + spin_unlock(&curr_sb_lock); + pr_err("ip_vs_sync_buff_create failed.\n"); + return; + } + } + + len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE : + SIMPLE_CONN_SIZE; + m = (struct ip_vs_sync_mesg_v0 *)curr_sb->mesg; + s = (struct ip_vs_sync_conn_v0 *)curr_sb->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 += len; + curr_sb->head += len; + + /* check if there is a space for next one */ + if (curr_sb->head + FULL_CONN_SIZE > curr_sb->end) { + sb_queue_tail(curr_sb); + curr_sb = NULL; + } + spin_unlock(&curr_sb_lock); + + /* synchronize its controller if it has */ + if (cp->control) + ip_vs_sync_conn(cp->control); +} + +/* * Add an ip_vs_conn information into the current sync_buff. * Called by ip_vs_in. * Sending Version 1 messages @@ -403,6 +532,11 @@ void ip_vs_sync_conn(struct ip_vs_conn *cp) __u8 *p; unsigned int len, pe_name_len, pad; + /* Handle old version of the protocol */ + if (sysctl_ip_vs_sync_ver == 0) { + ip_vs_sync_conn_v0(cp); + return; + } /* Do not sync ONE PACKET */ if (cp->flags & IP_VS_CONN_F_ONE_PACKET) goto control; |