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net/9p: add a privport option for RDMA transport. 

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>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Dominique Martinet 2015-01-09 13:07:00 +01:00 committed by Eric Van Hensbergen
parent 5c4086b8de
commit f569d3ef82
1 changed files with 44 additions and 8 deletions
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52
net/9p/trans_rdma.c
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@ -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);