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authorJeremy Kerr <jk@codeconstruct.com.au>2024-02-19 17:51:51 +0800
committerPaolo Abeni <pabeni@redhat.com>2024-02-22 13:32:55 +0100
commitc16d2380e8fdd9fc1fd0e9c60e068f264b2d0ced (patch)
tree60a778df974ea4ebc76c64e52d22c6e68d92385a /net/mctp/af_mctp.c
parent43e6795574f5d75284a3cb21f5b76a5ffb98e8e6 (diff)
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net: mctp: provide a more specific tag allocation ioctl
Now that we have net-specific tags, extend the tag allocation ioctls (SIOCMCTPALLOCTAG / SIOCMCTPDROPTAG) to allow a network parameter to be passed to the tag allocation. We also add a local_addr member to the ioc struct, to allow for a future finer-grained tag allocation using local EIDs too. We don't add any specific support for that now though, so require MCTP_ADDR_ANY or MCTP_ADDR_NULL for those at present. The old ioctls will still work, but allocate for the default MCTP net. These are now marked as deprecated in the header. Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net/mctp/af_mctp.c')
-rw-r--r--net/mctp/af_mctp.c117
1 files changed, 97 insertions, 20 deletions
diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c
index 05315a422ffb..de52a9191da0 100644
--- a/net/mctp/af_mctp.c
+++ b/net/mctp/af_mctp.c
@@ -350,30 +350,102 @@ static int mctp_getsockopt(struct socket *sock, int level, int optname,
return -EINVAL;
}
-static int mctp_ioctl_alloctag(struct mctp_sock *msk, unsigned long arg)
+/* helpers for reading/writing the tag ioc, handling compatibility across the
+ * two versions, and some basic API error checking
+ */
+static int mctp_ioctl_tag_copy_from_user(unsigned long arg,
+ struct mctp_ioc_tag_ctl2 *ctl,
+ bool tagv2)
+{
+ struct mctp_ioc_tag_ctl ctl_compat;
+ unsigned long size;
+ void *ptr;
+ int rc;
+
+ if (tagv2) {
+ size = sizeof(*ctl);
+ ptr = ctl;
+ } else {
+ size = sizeof(ctl_compat);
+ ptr = &ctl_compat;
+ }
+
+ rc = copy_from_user(ptr, (void __user *)arg, size);
+ if (rc)
+ return -EFAULT;
+
+ if (!tagv2) {
+ /* compat, using defaults for new fields */
+ ctl->net = MCTP_INITIAL_DEFAULT_NET;
+ ctl->peer_addr = ctl_compat.peer_addr;
+ ctl->local_addr = MCTP_ADDR_ANY;
+ ctl->flags = ctl_compat.flags;
+ ctl->tag = ctl_compat.tag;
+ }
+
+ if (ctl->flags)
+ return -EINVAL;
+
+ if (ctl->local_addr != MCTP_ADDR_ANY &&
+ ctl->local_addr != MCTP_ADDR_NULL)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int mctp_ioctl_tag_copy_to_user(unsigned long arg,
+ struct mctp_ioc_tag_ctl2 *ctl,
+ bool tagv2)
+{
+ struct mctp_ioc_tag_ctl ctl_compat;
+ unsigned long size;
+ void *ptr;
+ int rc;
+
+ if (tagv2) {
+ ptr = ctl;
+ size = sizeof(*ctl);
+ } else {
+ ctl_compat.peer_addr = ctl->peer_addr;
+ ctl_compat.tag = ctl->tag;
+ ctl_compat.flags = ctl->flags;
+
+ ptr = &ctl_compat;
+ size = sizeof(ctl_compat);
+ }
+
+ rc = copy_to_user((void __user *)arg, ptr, size);
+ if (rc)
+ return -EFAULT;
+
+ return 0;
+}
+
+static int mctp_ioctl_alloctag(struct mctp_sock *msk, bool tagv2,
+ unsigned long arg)
{
struct net *net = sock_net(&msk->sk);
struct mctp_sk_key *key = NULL;
- struct mctp_ioc_tag_ctl ctl;
+ struct mctp_ioc_tag_ctl2 ctl;
unsigned long flags;
u8 tag;
+ int rc;
- if (copy_from_user(&ctl, (void __user *)arg, sizeof(ctl)))
- return -EFAULT;
+ rc = mctp_ioctl_tag_copy_from_user(arg, &ctl, tagv2);
+ if (rc)
+ return rc;
if (ctl.tag)
return -EINVAL;
- if (ctl.flags)
- return -EINVAL;
-
- key = mctp_alloc_local_tag(msk, MCTP_INITIAL_DEFAULT_NET,
- MCTP_ADDR_ANY, ctl.peer_addr, true, &tag);
+ key = mctp_alloc_local_tag(msk, ctl.net, MCTP_ADDR_ANY,
+ ctl.peer_addr, true, &tag);
if (IS_ERR(key))
return PTR_ERR(key);
ctl.tag = tag | MCTP_TAG_OWNER | MCTP_TAG_PREALLOC;
- if (copy_to_user((void __user *)arg, &ctl, sizeof(ctl))) {
+ rc = mctp_ioctl_tag_copy_to_user(arg, &ctl, tagv2);
+ if (rc) {
unsigned long fl2;
/* Unwind our key allocation: the keys list lock needs to be
* taken before the individual key locks, and we need a valid
@@ -385,28 +457,27 @@ static int mctp_ioctl_alloctag(struct mctp_sock *msk, unsigned long arg)
__mctp_key_remove(key, net, fl2, MCTP_TRACE_KEY_DROPPED);
mctp_key_unref(key);
spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
- return -EFAULT;
+ return rc;
}
mctp_key_unref(key);
return 0;
}
-static int mctp_ioctl_droptag(struct mctp_sock *msk, unsigned long arg)
+static int mctp_ioctl_droptag(struct mctp_sock *msk, bool tagv2,
+ unsigned long arg)
{
struct net *net = sock_net(&msk->sk);
- struct mctp_ioc_tag_ctl ctl;
+ struct mctp_ioc_tag_ctl2 ctl;
unsigned long flags, fl2;
struct mctp_sk_key *key;
struct hlist_node *tmp;
int rc;
u8 tag;
- if (copy_from_user(&ctl, (void __user *)arg, sizeof(ctl)))
- return -EFAULT;
-
- if (ctl.flags)
- return -EINVAL;
+ rc = mctp_ioctl_tag_copy_from_user(arg, &ctl, tagv2);
+ if (rc)
+ return rc;
/* Must be a local tag, TO set, preallocated */
if ((ctl.tag & ~MCTP_TAG_MASK) != (MCTP_TAG_OWNER | MCTP_TAG_PREALLOC))
@@ -422,6 +493,7 @@ static int mctp_ioctl_droptag(struct mctp_sock *msk, unsigned long arg)
*/
spin_lock_irqsave(&key->lock, fl2);
if (key->manual_alloc &&
+ ctl.net == key->net &&
ctl.peer_addr == key->peer_addr &&
tag == key->tag) {
__mctp_key_remove(key, net, fl2,
@@ -439,12 +511,17 @@ static int mctp_ioctl_droptag(struct mctp_sock *msk, unsigned long arg)
static int mctp_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct mctp_sock *msk = container_of(sock->sk, struct mctp_sock, sk);
+ bool tagv2 = false;
switch (cmd) {
+ case SIOCMCTPALLOCTAG2:
case SIOCMCTPALLOCTAG:
- return mctp_ioctl_alloctag(msk, arg);
+ tagv2 = cmd == SIOCMCTPALLOCTAG2;
+ return mctp_ioctl_alloctag(msk, tagv2, arg);
case SIOCMCTPDROPTAG:
- return mctp_ioctl_droptag(msk, arg);
+ case SIOCMCTPDROPTAG2:
+ tagv2 = cmd == SIOCMCTPDROPTAG2;
+ return mctp_ioctl_droptag(msk, tagv2, arg);
}
return -EINVAL;