net: Use standard structures for generic socket address structures.

Use sockaddr_storage{} for generic socket address storage
and ensures proper alignment.
Use sockaddr{} for pointers to omit several casts.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 46 insertions, 36 deletions

diff --git a/net/socket.c b/net/socket.c
index 81fe8251304..1ba57d88898 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -180,9 +180,9 @@ static DEFINE_PER_CPU(int, sockets_in_use) = 0;
  *      invalid addresses -EFAULT is returned. On a success 0 is returned.
  */
 
-int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
+int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
 {
-        if (ulen < 0 || ulen > MAX_SOCK_ADDR)
+        if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
                 return -EINVAL;
         if (ulen == 0)
                 return 0;
@@ -208,7 +208,7 @@ int move_addr_to_kernel(void __user *uaddr, int ulen, void *kaddr)
  *      specified. Zero is returned for a success.
  */
 
-int move_addr_to_user(void *kaddr, int klen, void __user *uaddr,
+int move_addr_to_user(struct sockaddr *kaddr, int klen, void __user *uaddr,
                       int __user *ulen)
 {
         int err;
@@ -219,7 +219,7 @@ int move_addr_to_user(void *kaddr, int klen, void __user *uaddr,
                 return err;
         if (len > klen)
                 len = klen;
-        if (len < 0 || len > MAX_SOCK_ADDR)
+        if (len < 0 || len > sizeof(struct sockaddr_storage))
                 return -EINVAL;
         if (len) {
                 if (audit_sockaddr(klen, kaddr))
@@ -1342,20 +1342,20 @@ out_fd:
 asmlinkage long sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen)
 {
         struct socket *sock;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
         int err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (sock) {
-                err = move_addr_to_kernel(umyaddr, addrlen, address);
+                err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
                 if (err >= 0) {
                         err = security_socket_bind(sock,
-                                                   (struct sockaddr *)address,
+                                                   (struct sockaddr *)&address,
                                                    addrlen);
                         if (!err)
                                 err = sock->ops->bind(sock,
                                                       (struct sockaddr *)
-                                                      address, addrlen);
+                                                      &address, addrlen);
                 }
                 fput_light(sock->file, fput_needed);
         }
@@ -1407,7 +1407,7 @@ asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
         struct socket *sock, *newsock;
         struct file *newfile;
         int err, len, newfd, fput_needed;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
@@ -1446,13 +1446,13 @@ asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
                 goto out_fd;
 
         if (upeer_sockaddr) {
-                if (newsock->ops->getname(newsock, (struct sockaddr *)address,
+                if (newsock->ops->getname(newsock, (struct sockaddr *)&address,
                                           &len, 2) < 0) {
                         err = -ECONNABORTED;
                         goto out_fd;
                 }
-                err = move_addr_to_user(address, len, upeer_sockaddr,
-                                        upeer_addrlen);
+                err = move_addr_to_user((struct sockaddr *)&address,
+                                        len, upeer_sockaddr, upeer_addrlen);
                 if (err < 0)
                         goto out_fd;
         }
@@ -1495,22 +1495,22 @@ asmlinkage long sys_connect(int fd, struct sockaddr __user *uservaddr,
                             int addrlen)
 {
         struct socket *sock;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
         int err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
         if (!sock)
                 goto out;
-        err = move_addr_to_kernel(uservaddr, addrlen, address);
+        err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
         if (err < 0)
                 goto out_put;
 
         err =
-            security_socket_connect(sock, (struct sockaddr *)address, addrlen);
+            security_socket_connect(sock, (struct sockaddr *)&address, addrlen);
         if (err)
                 goto out_put;
 
-        err = sock->ops->connect(sock, (struct sockaddr *)address, addrlen,
+        err = sock->ops->connect(sock, (struct sockaddr *)&address, addrlen,
                                  sock->file->f_flags);
 out_put:
         fput_light(sock->file, fput_needed);
@@ -1527,7 +1527,7 @@ asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr,
                                 int __user *usockaddr_len)
 {
         struct socket *sock;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
         int len, err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
@@ -1538,10 +1538,10 @@ asmlinkage long sys_getsockname(int fd, struct sockaddr __user *usockaddr,
         if (err)
                 goto out_put;
 
-        err = sock->ops->getname(sock, (struct sockaddr *)address, &len, 0);
+        err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
         if (err)
                 goto out_put;
-        err = move_addr_to_user(address, len, usockaddr, usockaddr_len);
+        err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
 
 out_put:
         fput_light(sock->file, fput_needed);
@@ -1558,7 +1558,7 @@ asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr,
                                 int __user *usockaddr_len)
 {
         struct socket *sock;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
         int len, err, fput_needed;
 
         sock = sockfd_lookup_light(fd, &err, &fput_needed);
@@ -1570,10 +1570,10 @@ asmlinkage long sys_getpeername(int fd, struct sockaddr __user *usockaddr,
                 }
 
                 err =
-                    sock->ops->getname(sock, (struct sockaddr *)address, &len,
+                    sock->ops->getname(sock, (struct sockaddr *)&address, &len,
                                        1);
                 if (!err)
-                        err = move_addr_to_user(address, len, usockaddr,
+                        err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
                                                 usockaddr_len);
                 fput_light(sock->file, fput_needed);
         }
@@ -1591,7 +1591,7 @@ asmlinkage long sys_sendto(int fd, void __user *buff, size_t len,
                            int addr_len)
 {
         struct socket *sock;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
         int err;
         struct msghdr msg;
         struct iovec iov;
@@ -1610,10 +1610,10 @@ asmlinkage long sys_sendto(int fd, void __user *buff, size_t len,
         msg.msg_controllen = 0;
         msg.msg_namelen = 0;
         if (addr) {
-                err = move_addr_to_kernel(addr, addr_len, address);
+                err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
                 if (err < 0)
                         goto out_put;
-                msg.msg_name = address;
+                msg.msg_name = (struct sockaddr *)&address;
                 msg.msg_namelen = addr_len;
         }
         if (sock->file->f_flags & O_NONBLOCK)
@@ -1649,7 +1649,7 @@ asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size,
         struct socket *sock;
         struct iovec iov;
         struct msghdr msg;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
         int err, err2;
         int fput_needed;
 
@@ -1663,14 +1663,15 @@ asmlinkage long sys_recvfrom(int fd, void __user *ubuf, size_t size,
         msg.msg_iov = &iov;
         iov.iov_len = size;
         iov.iov_base = ubuf;
-        msg.msg_name = address;
-        msg.msg_namelen = MAX_SOCK_ADDR;
+        msg.msg_name = (struct sockaddr *)&address;
+        msg.msg_namelen = sizeof(address);
         if (sock->file->f_flags & O_NONBLOCK)
                 flags |= MSG_DONTWAIT;
         err = sock_recvmsg(sock, &msg, size, flags);
 
         if (err >= 0 && addr != NULL) {
-                err2 = move_addr_to_user(address, msg.msg_namelen, addr, addr_len);
+                err2 = move_addr_to_user((struct sockaddr *)&address,
+                                         msg.msg_namelen, addr, addr_len);
                 if (err2 < 0)
                         err = err2;
         }
@@ -1790,7 +1791,7 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
         struct compat_msghdr __user *msg_compat =
             (struct compat_msghdr __user *)msg;
         struct socket *sock;
-        char address[MAX_SOCK_ADDR];
+        struct sockaddr_storage address;
         struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
         unsigned char ctl[sizeof(struct cmsghdr) + 20]
             __attribute__ ((aligned(sizeof(__kernel_size_t))));
@@ -1828,9 +1829,13 @@ asmlinkage long sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
 
         /* This will also move the address data into kernel space */
         if (MSG_CMSG_COMPAT & flags) {
-                err = verify_compat_iovec(&msg_sys, iov, address, VERIFY_READ);
+                err = verify_compat_iovec(&msg_sys, iov,
+                                          (struct sockaddr *)&address,
+                                          VERIFY_READ);
         } else
-                err = verify_iovec(&msg_sys, iov, address, VERIFY_READ);
+                err = verify_iovec(&msg_sys, iov,
+                                   (struct sockaddr *)&address,
+                                   VERIFY_READ);
         if (err < 0)
                 goto out_freeiov;
         total_len = err;
@@ -1901,7 +1906,7 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
         int fput_needed;
 
         /* kernel mode address */
-        char addr[MAX_SOCK_ADDR];
+        struct sockaddr_storage addr;
 
         /* user mode address pointers */
         struct sockaddr __user *uaddr;
@@ -1939,9 +1944,13 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
         uaddr = (__force void __user *)msg_sys.msg_name;
         uaddr_len = COMPAT_NAMELEN(msg);
         if (MSG_CMSG_COMPAT & flags) {
-                err = verify_compat_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
+                err = verify_compat_iovec(&msg_sys, iov,
+                                          (struct sockaddr *)&addr,
+                                          VERIFY_WRITE);
         } else
-                err = verify_iovec(&msg_sys, iov, addr, VERIFY_WRITE);
+                err = verify_iovec(&msg_sys, iov,
+                                   (struct sockaddr *)&addr,
+                                   VERIFY_WRITE);
         if (err < 0)
                 goto out_freeiov;
         total_len = err;
@@ -1957,7 +1966,8 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg,
         len = err;
 
         if (uaddr != NULL) {
-                err = move_addr_to_user(addr, msg_sys.msg_namelen, uaddr,
+                err = move_addr_to_user((struct sockaddr *)&addr,
+                                        msg_sys.msg_namelen, uaddr,
                                         uaddr_len);
                 if (err < 0)
                         goto out_freeiov;