mctp: convert to getsockopt_iter

Convert MCTP socket's getsockopt implementation to use the new
getsockopt_iter callback with sockopt_t.

Key changes:
- Replace (char __user *optval, int __user *optlen) with sockopt_t *opt
- Use opt->optlen for buffer length (input)
- Use copy_to_iter() instead of copy_to_user()
- Add linux/uio.h for copy_to_iter()

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20260507-getsock_two-v2-1-5873111d9c12@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c
index 209a963112e3a516230e03909ca31dfddf400cac..8af5e2b3c8d12d9bcf40f4b46400ec2be785f2d1 100644 (file)
--- a/net/mctp/af_mctp.c
+++ b/net/mctp/af_mctp.c
@@ -12,6 +12,7 @@
 #include <linux/mctp.h>
 #include <linux/module.h>
 #include <linux/socket.h>
+#include <linux/uio.h>
 
 #include <net/mctp.h>
 #include <net/mctpdevice.h>
@@ -405,7 +406,7 @@ static int mctp_setsockopt(struct socket *sock, int level, int optname,
 }
 
 static int mctp_getsockopt(struct socket *sock, int level, int optname,
-                          char __user *optval, int __user *optlen)
+                          sockopt_t *opt)
 {
        struct mctp_sock *msk = container_of(sock->sk, struct mctp_sock, sk);
        int len, val;
@@ -413,14 +414,13 @@ static int mctp_getsockopt(struct socket *sock, int level, int optname,
        if (level != SOL_MCTP)
                return -EINVAL;
 
-       if (get_user(len, optlen))
-               return -EFAULT;
+       len = opt->optlen;
 
        if (optname == MCTP_OPT_ADDR_EXT) {
                if (len != sizeof(int))
                        return -EINVAL;
                val = !!msk->addr_ext;
-               if (copy_to_user(optval, &val, len))
+               if (copy_to_iter(&val, len, &opt->iter_out) != len)
                        return -EFAULT;
                return 0;
        }
@@ -639,7 +639,7 @@ static const struct proto_ops mctp_dgram_ops = {
        .listen         = sock_no_listen,
        .shutdown       = sock_no_shutdown,
        .setsockopt     = mctp_setsockopt,
-       .getsockopt     = mctp_getsockopt,
+       .getsockopt_iter = mctp_getsockopt,
        .sendmsg        = mctp_sendmsg,
        .recvmsg        = mctp_recvmsg,
        .mmap           = sock_no_mmap,