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authorDominique Martinet <dominique.martinet@cea.fr>2015-01-09 09:51:30 +0100
committerDominique Martinet <dominique.martinet@cea.fr>2015-03-13 18:49:06 +0100
commit2f818b8337c3a4820b34f3a00cc9c0c449e7cd25 (patch)
treee2c2238f2a83c100a3e00c05c3f1f1d021c0c328
parenta46e6431f050d36f22215f5169d53606c4d55269 (diff)
net/9p: add a privport option for RDMA transport.HEADfor-next
RDMA can use the same kind of weak security as TCP by checking the client can bind to a privileged port, which is better than nothing if TAUTH isn't implemented. Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
-rw-r--r--net/9p/trans_rdma.c52
1 files changed, 44 insertions, 8 deletions
diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index 14ad43b5cf8..3533d2a53ab 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -139,6 +139,7 @@ struct p9_rdma_opts {
int sq_depth;
int rq_depth;
long timeout;
+ int privport;
};
/*
@@ -146,7 +147,10 @@ struct p9_rdma_opts {
*/
enum {
/* Options that take integer arguments */
- Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout, Opt_err,
+ Opt_port, Opt_rq_depth, Opt_sq_depth, Opt_timeout,
+ /* Options that take no argument */
+ Opt_privport,
+ Opt_err,
};
static match_table_t tokens = {
@@ -154,6 +158,7 @@ static match_table_t tokens = {
{Opt_sq_depth, "sq=%u"},
{Opt_rq_depth, "rq=%u"},
{Opt_timeout, "timeout=%u"},
+ {Opt_privport, "privport"},
{Opt_err, NULL},
};
@@ -175,6 +180,7 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
opts->sq_depth = P9_RDMA_SQ_DEPTH;
opts->rq_depth = P9_RDMA_RQ_DEPTH;
opts->timeout = P9_RDMA_TIMEOUT;
+ opts->privport = 0;
if (!params)
return 0;
@@ -193,13 +199,13 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
if (!*p)
continue;
token = match_token(p, tokens, args);
- if (token == Opt_err)
- continue;
- r = match_int(&args[0], &option);
- if (r < 0) {
- p9_debug(P9_DEBUG_ERROR,
- "integer field, but no integer?\n");
- continue;
+ if ((token != Opt_err) && (token != Opt_privport)) {
+ r = match_int(&args[0], &option);
+ if (r < 0) {
+ p9_debug(P9_DEBUG_ERROR,
+ "integer field, but no integer?\n");
+ continue;
+ }
}
switch (token) {
case Opt_port:
@@ -214,6 +220,9 @@ static int parse_opts(char *params, struct p9_rdma_opts *opts)
case Opt_timeout:
opts->timeout = option;
break;
+ case Opt_privport:
+ opts->privport = 1;
+ break;
default:
continue;
}
@@ -607,6 +616,23 @@ static int rdma_cancelled(struct p9_client *client, struct p9_req_t *req)
return 0;
}
+static int p9_rdma_bind_privport(struct p9_trans_rdma *rdma)
+{
+ struct sockaddr_in cl = {
+ .sin_family = AF_INET,
+ .sin_addr.s_addr = htonl(INADDR_ANY),
+ };
+ int port, err = -EINVAL;
+
+ for (port = P9_DEF_MAX_RESVPORT; port >= P9_DEF_MIN_RESVPORT; port--) {
+ cl.sin_port = htons((ushort)port);
+ err = rdma_bind_addr(rdma->cm_id, (struct sockaddr *)&cl);
+ if (err != -EADDRINUSE)
+ break;
+ }
+ return err;
+}
+
/**
* trans_create_rdma - Transport method for creating atransport instance
* @client: client instance
@@ -642,6 +668,16 @@ rdma_create_trans(struct p9_client *client, const char *addr, char *args)
/* Associate the client with the transport */
client->trans = rdma;
+ /* Bind to a privileged port if we need to */
+ if (opts.privport) {
+ err = p9_rdma_bind_privport(rdma);
+ if (err < 0) {
+ pr_err("%s (%d): problem binding to privport: %d\n",
+ __func__, task_pid_nr(current), -err);
+ goto error;
+ }
+ }
+
/* Resolve the server's address */
rdma->addr.sin_family = AF_INET;
rdma->addr.sin_addr.s_addr = in_aton(addr);