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authorChristoph Hellwig <hch@lst.de>2020-05-11 13:59:11 +0200
committerDavid S. Miller <davem@davemloft.net>2020-05-11 16:59:16 -0700
commit0462b6bdb6445b887b8896f28be92e0d94c92e7b (patch)
tree9d4b3f468d481aa66b31e5cdb6ad532458889c4d /include/linux/socket.h
parent3242956bd610af40e884b530b6c6f76f5bf85f3b (diff)
net: add a CMSG_USER_DATA macro
Add a variant of CMSG_DATA that operates on user pointer to avoid sparse warnings about casting to/from user pointers. Also fix up CMSG_DATA to rely on the gcc extension that allows void pointer arithmetics to cut down on the amount of casts. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/socket.h')
-rw-r--r--include/linux/socket.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 54338fac45cb..4cc64d611cf4 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -94,7 +94,10 @@ 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))