New structs defined for version 1 of sync.
* ip_vs_sync_v4 Ipv4 base format struct
* ip_vs_sync_v6 Ipv6 base format struct
*v3
Minor changes in comments
[ horms@xxxxxxxxxxxx: minor documentation, spelling and whitespace changes ]
*v2
ip_vs_sync_pe_opt removed due to new option/param handling.
Julians comments with options casuses this change
Signed-off-by: Hans Schillstrom <hans.schillstrom@xxxxxxxxxxxx>
---
net/netfilter/ipvs/ip_vs_sync.c | 154 ++++++++++++++++++++++++++++++++++++---
1 files changed, 142 insertions(+), 12 deletions(-)
diff --git a/net/netfilter/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index 90ed9b3..0cfeeee 100644
--- a/net/netfilter/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
@@ -43,11 +43,13 @@
#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 */
/*
* IPVS sync connection entry
+ * Version 0, i.e. original version.
*/
-struct ip_vs_sync_conn {
+struct ip_vs_sync_conn_v0 {
__u8 reserved;
/* Protocol, addresses and port numbers */
@@ -71,40 +73,157 @@ struct ip_vs_sync_conn_options {
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_OPT_DATA 7
+#define STYPE_F_INET6 (1 << STYPE_INET6)
+#define STYPE_F_OPT_DATA (1 << STYPE_OPT_DATA)
+
+#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_F_SEQ_DATA (1 << (IPVS_OPT_SEQ_DATA-1))
+#define IPVS_OPT_F_PE_DATA (1 << (IPVS_OPT_PE_DATA))
+#define IPVS_OPT_F_PE_NAME (1 << (IPVS_OPT_PE_NAME))
+
struct ip_vs_sync_thread_data {
struct socket *sock;
char *buf;
};
-#define SIMPLE_CONN_SIZE (sizeof(struct ip_vs_sync_conn))
+/* 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) + sizeof(struct ip_vs_sync_conn_options))
+(sizeof(struct ip_vs_sync_conn_v0) + sizeof(struct ip_vs_sync_conn_options))
/*
- The master mulitcasts messages to the backup load balancers in the
- following format.
+ 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
- | Count Conns | SyncID | Size |
+ | 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 {
__u8 nr_conns;
__u8 syncid;
@@ -113,6 +232,17 @@ struct ip_vs_sync_mesg {
/* ip_vs_sync_conn entries start here */
};
+/* Version 1 header */
+struct ip_vs_sync_mesg_v2 {
+ __u8 reserved; /* must be zero */
+ __u8 syncid;
+ __u16 size;
+ __u8 nr_conns;
+ __s8 version; /* SYNC_PROTO_VER */
+ __u16 spare;
+ /* ip_vs_sync_conn entries start here */
+};
+
/* the maximum length of sync (sending/receiving) message */
static int sync_send_mesg_maxlen;
static int sync_recv_mesg_maxlen;
@@ -239,7 +369,7 @@ get_curr_sync_buff(unsigned long time)
void ip_vs_sync_conn(struct ip_vs_conn *cp)
{
struct ip_vs_sync_mesg *m;
- struct ip_vs_sync_conn *s;
+ struct ip_vs_sync_conn_v0 *s;
int len;
spin_lock(&curr_sb_lock);
@@ -254,7 +384,7 @@ void ip_vs_sync_conn(struct ip_vs_conn *cp)
len = (cp->flags & IP_VS_CONN_F_SEQ_MASK) ? FULL_CONN_SIZE :
SIMPLE_CONN_SIZE;
m = curr_sb->mesg;
- s = (struct ip_vs_sync_conn *)curr_sb->head;
+ s = (struct ip_vs_sync_conn_v0 *)curr_sb->head;
/* copy members */
s->protocol = cp->protocol;
@@ -306,7 +436,7 @@ ip_vs_conn_fill_param_sync(int af, int protocol,
static void ip_vs_process_message(const char *buffer, const size_t buflen)
{
struct ip_vs_sync_mesg *m = (struct ip_vs_sync_mesg *)buffer;
- struct ip_vs_sync_conn *s;
+ struct ip_vs_sync_conn_v0 *s;
struct ip_vs_sync_conn_options *opt;
struct ip_vs_conn *cp;
struct ip_vs_protocol *pp;
@@ -343,7 +473,7 @@ static void ip_vs_process_message(const char *buffer, const size_t buflen)
IP_VS_ERR_RL("bogus conn in sync message\n");
return;
}
- s = (struct ip_vs_sync_conn *) p;
+ 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) {
@@ -851,7 +981,7 @@ int start_sync_thread(int state, char *mcast_ifn, __u8 syncid)
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));
+ sizeof(struct ip_vs_sync_conn_v0));
if (state == IP_VS_STATE_MASTER) {
if (sync_master_thread)
--
1.7.2.3
--
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