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Diffstat (limited to 'include/linux/socket.h')
-rw-r--r--include/linux/socket.h17
1 files changed, 15 insertions, 2 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 54338fac45cb..04d2bc97f497 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -50,7 +50,17 @@ struct msghdr {
void *msg_name; /* ptr to socket address structure */
int msg_namelen; /* size of socket address structure */
struct iov_iter msg_iter; /* data */
- void *msg_control; /* ancillary data */
+
+ /*
+ * Ancillary data. msg_control_user is the user buffer used for the
+ * recv* side when msg_control_is_user is set, msg_control is the kernel
+ * buffer used for all other cases.
+ */
+ union {
+ void *msg_control;
+ void __user *msg_control_user;
+ };
+ bool msg_control_is_user : 1;
__kernel_size_t msg_controllen; /* ancillary data buffer length */
unsigned int msg_flags; /* flags on received message */
struct kiocb *msg_iocb; /* ptr to iocb for async requests */
@@ -94,7 +104,10 @@ struct cmsghdr {
#define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
-#define CMSG_DATA(cmsg) ((void *)((char *)(cmsg) + sizeof(struct cmsghdr)))
+#define CMSG_DATA(cmsg) \
+ ((void *)(cmsg) + sizeof(struct cmsghdr))
+#define CMSG_USER_DATA(cmsg) \
+ ((void __user *)(cmsg) + sizeof(struct cmsghdr))
#define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
#define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))