Eric Lee / smarc-ti-linux-kernel

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include/net/scm.h 2.71 KB
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1da177e4c   Linus Torvalds   Linux-2.6.12-rc2 
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  #ifndef __LINUX_NET_SCM_H
  #define __LINUX_NET_SCM_H
  
  #include <linux/limits.h>
  #include <linux/net.h>
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  #include <linux/security.h>
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  /* Well, we should have at least one descriptor open
   * to accept passed FDs 8)
   */
  #define SCM_MAX_FD	(OPEN_MAX-1)
  
  struct scm_fp_list
  {
  	int		count;
  	struct file	*fp[SCM_MAX_FD];
  };
  
  struct scm_cookie
  {
  	struct ucred		creds;		/* Skb credentials	*/
  	struct scm_fp_list	*fp;		/* Passed files		*/
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  #ifdef CONFIG_SECURITY_NETWORK
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  	u32			secid;		/* Passed security ID 	*/
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  #endif
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  	unsigned long		seq;		/* Connection seqno	*/
  };
  
  extern void scm_detach_fds(struct msghdr *msg, struct scm_cookie *scm);
  extern void scm_detach_fds_compat(struct msghdr *msg, struct scm_cookie *scm);
  extern int __scm_send(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm);
  extern void __scm_destroy(struct scm_cookie *scm);
  extern struct scm_fp_list * scm_fp_dup(struct scm_fp_list *fpl);
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  #ifdef CONFIG_SECURITY_NETWORK
  static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
  {
  	security_socket_getpeersec_dgram(sock, NULL, &scm->secid);
  }
  #else
  static __inline__ void unix_get_peersec_dgram(struct socket *sock, struct scm_cookie *scm)
  { }
  #endif /* CONFIG_SECURITY_NETWORK */
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  static __inline__ void scm_destroy(struct scm_cookie *scm)
  {
  	if (scm && scm->fp)
  		__scm_destroy(scm);
  }
  
  static __inline__ int scm_send(struct socket *sock, struct msghdr *msg,
  			       struct scm_cookie *scm)
  {
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  	struct task_struct *p = current;
  	scm->creds.uid = p->uid;
  	scm->creds.gid = p->gid;
  	scm->creds.pid = p->tgid;
  	scm->fp = NULL;
  	scm->seq = 0;
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  	unix_get_peersec_dgram(sock, scm);
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  	if (msg->msg_controllen <= 0)
  		return 0;
  	return __scm_send(sock, msg, scm);
  }
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  #ifdef CONFIG_SECURITY_NETWORK
  static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
  {
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  	char *secdata;
  	u32 seclen;
  	int err;
  
  	if (test_bit(SOCK_PASSSEC, &sock->flags)) {
  		err = security_secid_to_secctx(scm->secid, &secdata, &seclen);
  
  		if (!err) {
  			put_cmsg(msg, SOL_SOCKET, SCM_SECURITY, seclen, secdata);
  			security_release_secctx(secdata, seclen);
  		}
  	}
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  }
  #else
  static inline void scm_passec(struct socket *sock, struct msghdr *msg, struct scm_cookie *scm)
  { }
  #endif /* CONFIG_SECURITY_NETWORK */
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  static __inline__ void scm_recv(struct socket *sock, struct msghdr *msg,
  				struct scm_cookie *scm, int flags)
  {
  	if (!msg->msg_control)
  	{
  		if (test_bit(SOCK_PASSCRED, &sock->flags) || scm->fp)
  			msg->msg_flags |= MSG_CTRUNC;
  		scm_destroy(scm);
  		return;
  	}
  
  	if (test_bit(SOCK_PASSCRED, &sock->flags))
  		put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS, sizeof(scm->creds), &scm->creds);
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  	scm_passec(sock, msg, scm);
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  	if (!scm->fp)
  		return;
  	
  	scm_detach_fds(msg, scm);
  }
  
  
  #endif /* __LINUX_NET_SCM_H */