@@ -26,6 +26,9 @@
#ifndef NET_9P_TRANSPORT_H
#define NET_9P_TRANSPORT_H
+#define P9_DEF_MIN_RESVPORT (665U)
+#define P9_DEF_MAX_RESVPORT (1023U)
+
/**
* struct p9_trans_module - transport module interface
* @list: used to maintain a list of currently available transports
@@ -63,6 +63,7 @@ struct p9_fd_opts {
int rfd;
int wfd;
u16 port;
+ int privport;
};
/**
@@ -87,12 +88,15 @@ struct p9_trans_fd {
enum {
/* Options that take integer arguments */
Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
+ /* Options that take no arguments */
+ Opt_privport,
};
static const match_table_t tokens = {
{Opt_port, "port=%u"},
{Opt_rfdno, "rfdno=%u"},
{Opt_wfdno, "wfdno=%u"},
+ {Opt_privport, "privport"},
{Opt_err, NULL},
};
@@ -161,6 +165,9 @@ static DEFINE_SPINLOCK(p9_poll_lock);
static LIST_HEAD(p9_poll_pending_list);
static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
+static unsigned int p9_ipport_resv_min = P9_DEF_MIN_RESVPORT;
+static unsigned int p9_ipport_resv_max = P9_DEF_MAX_RESVPORT;
+
static void p9_mux_poll_stop(struct p9_conn *m)
{
unsigned long flags;
@@ -741,7 +748,7 @@ static int parse_opts(char *params, struct p9_fd_opts *opts)
if (!*p)
continue;
token = match_token(p, tokens, args);
- if (token != Opt_err) {
+ if (token != Opt_err && token != Opt_privport) {
r = match_int(&args[0], &option);
if (r < 0) {
p9_debug(P9_DEBUG_ERROR,
@@ -759,6 +766,9 @@ static int parse_opts(char *params, struct p9_fd_opts *opts)
case Opt_wfdno:
opts->wfd = option;
break;
+ case Opt_privport:
+ opts->privport = 1;
+ break;
default:
continue;
}
@@ -898,6 +908,24 @@ static inline int valid_ipaddr4(const char *buf)
return 0;
}
+static int p9_bind_privport (struct socket *sock)
+{
+ struct sockaddr_in cl;
+ int port, err = -EINVAL;
+
+ memset(&cl, 0, sizeof (cl));
+ cl.sin_family = AF_INET;
+ cl.sin_addr.s_addr = INADDR_ANY;
+ for (port = p9_ipport_resv_max; port >= p9_ipport_resv_min; port--) {
+ cl.sin_port = htons((ushort)port);
+ err = kernel_bind(sock, (struct sockaddr *)&cl, sizeof (cl));
+ if (err != -EADDRINUSE)
+ break;
+ }
+ return err;
+}
+
+
static int
p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
{
@@ -926,6 +954,16 @@ p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
return err;
}
+ if (opts.privport) {
+ err = p9_bind_privport (csocket);
+ if (err < 0) {
+ pr_err("%s (%d): problem binding to privport\n",
+ __func__, task_pid_nr(current));
+ sock_release(csocket);
+ return err;
+ }
+ }
+
err = csocket->ops->connect(csocket,
(struct sockaddr *)&sin_server,
sizeof(struct sockaddr_in), 0);
If the privport option is specified, the tcp transport binds local address to a reserved port before connecting to the 9p server. In some cases when 9P AUTH cannot be implemented, this is better than nothing. Signed-off-by: Jim Garlick <garlick@llnl.gov> --- include/net/9p/transport.h | 3 +++ net/9p/trans_fd.c | 40 +++++++++++++++++++++++++++++++++++++++- 2 files changed, 42 insertions(+), 1 deletions(-)