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[PATCH] RPC: allow RPC client's port range to be adjustable 

Select an RPC client source port between 650 and 1023 instead of between
 1 and 800.  The old range conflicts with a number of network services.
 Provide sysctls to allow admins to select a different port range.

 Note that this doesn't affect user-level RPC library behavior, which
 still uses 1 to 800.

 Based on a suggestion by Olaf Kirch <okir@suse.de>.

 Test-plan:
 Repeated mount and unmount.  Destructive testing.  Idle timeouts.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2005-08-25 16:25:54 -07:00 committed by Trond Myklebust
parent 555ee3af16
commit 529b33c6db
4 changed files with 53 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/sunrpc/debug.h
View File

@ -95,6 +95,8 @@ enum {
CTL_NLMDEBUG,
CTL_SLOTTABLE_UDP,
CTL_SLOTTABLE_TCP,
CTL_MIN_RESVPORT,
CTL_MAX_RESVPORT,
};
#endif /* _LINUX_SUNRPC_DEBUG_H_ */

17
include/linux/sunrpc/xprt.h
View File

@ -51,6 +51,17 @@ extern unsigned int xprt_tcp_slot_table_entries;
#define RPC_CALLHDRSIZE 6
#define RPC_REPHDRSIZE 4
/*
* Parameters for choosing a free port
*/
extern unsigned int xprt_min_resvport;
extern unsigned int xprt_max_resvport;
#define RPC_MIN_RESVPORT (1U)
#define RPC_MAX_RESVPORT (65535U)
#define RPC_DEF_MIN_RESVPORT (650U)
#define RPC_DEF_MAX_RESVPORT (1023U)
/*
* This describes a timeout strategy
*/
@ -62,6 +73,9 @@ struct rpc_timeout {
unsigned char to_exponential;
};
struct rpc_task;
struct rpc_xprt;
/*
* This describes a complete RPC request
*/
@ -107,9 +121,6 @@ struct rpc_rqst {
#define rq_svec rq_snd_buf.head
#define rq_slen rq_snd_buf.len
struct rpc_task;
struct rpc_xprt;
struct rpc_xprt_ops {
void (*set_buffer_size)(struct rpc_xprt *xprt);
int (*reserve_xprt)(struct rpc_task *task);

29
net/sunrpc/sysctl.c
View File

@ -121,9 +121,16 @@ proc_dodebug(ctl_table *table, int write, struct file *file,
unsigned int xprt_udp_slot_table_entries = RPC_DEF_SLOT_TABLE;
unsigned int xprt_tcp_slot_table_entries = RPC_DEF_SLOT_TABLE;
unsigned int xprt_min_resvport = RPC_DEF_MIN_RESVPORT;
EXPORT_SYMBOL(xprt_min_resvport);
unsigned int xprt_max_resvport = RPC_DEF_MAX_RESVPORT;
EXPORT_SYMBOL(xprt_max_resvport);
static unsigned int min_slot_table_size = RPC_MIN_SLOT_TABLE;
static unsigned int max_slot_table_size = RPC_MAX_SLOT_TABLE;
static unsigned int xprt_min_resvport_limit = RPC_MIN_RESVPORT;
static unsigned int xprt_max_resvport_limit = RPC_MAX_RESVPORT;
static ctl_table debug_table[] = {
{
@ -180,6 +187,28 @@ static ctl_table debug_table[] = {
.extra1 = &min_slot_table_size,
.extra2 = &max_slot_table_size
},
{
.ctl_name = CTL_MIN_RESVPORT,
.procname = "min_resvport",
.data = &xprt_min_resvport,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &xprt_min_resvport_limit,
.extra2 = &xprt_max_resvport_limit
},
{
.ctl_name = CTL_MAX_RESVPORT,
.procname = "max_resvport",
.data = &xprt_max_resvport,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = &proc_dointvec_minmax,
.strategy = &sysctl_intvec,
.extra1 = &xprt_min_resvport_limit,
.extra2 = &xprt_max_resvport_limit
},
{ .ctl_name = 0 }
};

23
net/sunrpc/xprtsock.c
View File

@ -35,11 +35,6 @@
#include <net/udp.h>
#include <net/tcp.h>
/*
* Maximum port number to use when requesting a reserved port.
*/
#define XS_MAX_RESVPORT (800U)
/*
* How many times to try sending a request on a socket before waiting
* for the socket buffer to clear.
@ -873,10 +868,9 @@ static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
struct sockaddr_in myaddr = {
.sin_family = AF_INET,
};
int err, port;
int err;
unsigned short port = xprt->port;
/* Were we already bound to a given port? Try to reuse it */
port = xprt->port;
do {
myaddr.sin_port = htons(port);
err = sock->ops->bind(sock, (struct sockaddr *) &myaddr,
@ -887,8 +881,10 @@ static int xs_bindresvport(struct rpc_xprt *xprt, struct socket *sock)
port);
return 0;
}
if (--port == 0)
port = XS_MAX_RESVPORT;
if (port <= xprt_min_resvport)
port = xprt_max_resvport;
else
port--;
} while (err == -EADDRINUSE && port != xprt->port);
dprintk("RPC: can't bind to reserved port (%d).\n", -err);
@ -1075,9 +1071,6 @@ static struct rpc_xprt_ops xs_tcp_ops = {
.destroy = xs_destroy,
};
extern unsigned int xprt_udp_slot_table_entries;
extern unsigned int xprt_tcp_slot_table_entries;
/**
* xs_setup_udp - Set up transport to use a UDP socket
* @xprt: transport to set up
@ -1098,7 +1091,7 @@ int xs_setup_udp(struct rpc_xprt *xprt, struct rpc_timeout *to)
memset(xprt->slot, 0, slot_table_size);
xprt->prot = IPPROTO_UDP;
xprt->port = XS_MAX_RESVPORT;
xprt->port = xprt_max_resvport;
xprt->tsh_size = 0;
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
/* XXX: header size can vary due to auth type, IPv6, etc. */
@ -1136,7 +1129,7 @@ int xs_setup_tcp(struct rpc_xprt *xprt, struct rpc_timeout *to)
memset(xprt->slot, 0, slot_table_size);
xprt->prot = IPPROTO_TCP;
xprt->port = XS_MAX_RESVPORT;
xprt->port = xprt_max_resvport;
xprt->tsh_size = sizeof(rpc_fraghdr) / sizeof(u32);
xprt->resvport = capable(CAP_NET_BIND_SERVICE) ? 1 : 0;
xprt->max_payload = RPC_MAX_FRAGMENT_SIZE;