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Message-Id: <1295464519-21763-32-git-send-email-kaber@trash.net>
Date: Wed, 19 Jan 2011 20:14:31 +0100
From: kaber@...sh.net
To: davem@...emloft.net
Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 31/79] IPVS: Backup, adding version 0 sending capabilities
From: Hans Schillstrom <hans.schillstrom@...csson.com>
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@...csson.com>
Acked-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
include/net/ip_vs.h | 2 +
net/netfilter/ipvs/ip_vs_ctl.c | 28 ++++++++-
net/netfilter/ipvs/ip_vs_sync.c | 134 +++++++++++++++++++++++++++++++++++++++
3 files changed, 163 insertions(+), 1 deletions(-)
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index a715f3d..d858264 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -883,7 +883,9 @@ extern int sysctl_ip_vs_conntrack;
extern int sysctl_ip_vs_snat_reroute;
extern struct ip_vs_stats ip_vs_stats;
extern const struct ctl_path net_vs_ctl_path[];
+extern int sysctl_ip_vs_sync_ver;
+extern void ip_vs_sync_switch_mode(int mode);
extern struct ip_vs_service *
ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
const union nf_inet_addr *vaddr, __be16 vport);
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index a5bd002..d12a13c 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -92,7 +92,7 @@ int sysctl_ip_vs_nat_icmp_send = 0;
int sysctl_ip_vs_conntrack;
#endif
int sysctl_ip_vs_snat_reroute = 1;
-
+int sysctl_ip_vs_sync_ver = 1; /* Default version of sync proto */
#ifdef CONFIG_IP_VS_DEBUG
static int sysctl_ip_vs_debug_level = 0;
@@ -1536,6 +1536,25 @@ proc_do_sync_threshold(ctl_table *table, int write,
return rc;
}
+static int
+proc_do_sync_mode(ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int *valp = table->data;
+ int val = *valp;
+ int rc;
+
+ rc = proc_dointvec(table, write, buffer, lenp, ppos);
+ if (write && (*valp != val)) {
+ if ((*valp < 0) || (*valp > 1)) {
+ /* Restore the correct value */
+ *valp = val;
+ } else {
+ ip_vs_sync_switch_mode(val);
+ }
+ }
+ return rc;
+}
/*
* IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
@@ -1602,6 +1621,13 @@ static struct ctl_table vs_vars[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
+ {
+ .procname = "sync_version",
+ .data = &sysctl_ip_vs_sync_ver,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_do_sync_mode,
+ },
#if 0
{
.procname = "timeout_established",
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@...uxvirtualserver.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;
--
1.7.2.3
--
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