include/net/scm.h

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 1 #ifndef __LINUX_NET_SCM_H
 2 #define __LINUX_NET_SCM_H
 3
 4 /* Well, we should have at least one descriptor open
 5  * to accept passed FDs 8)
 6  */
 7 #define SCM_MAX_FD (OPEN_MAX-1)
 8
 9 struct scm_fp_list
 10 {
 11 int count;
 12 struct file *fp[SCM_MAX_FD];
 13 };
 14
 15 struct scm_cookie
 16 {
 17 struct ucred creds;/* Skb credentials */
 18 struct scm_fp_list *fp;/* Passed files */
 19 unsigned long seq;/* Connection seqno */
 20 };
 21
 22 externvoidscm_detach_fds(struct msghdr *msg,struct scm_cookie *scm);
 23 externint__scm_send(struct socket *sock,struct msghdr *msg,struct scm_cookie *scm);
 24 externvoid__scm_destroy(struct scm_cookie *scm);
 25 externstruct scm_fp_list *scm_fp_dup(struct scm_fp_list *fpl);
 26
 27 static __inline__ voidscm_destroy(struct scm_cookie *scm)
 28 {
 29 if(scm && scm->fp)
 30 __scm_destroy(scm);
 31 }
 32
 33 static __inline__ intscm_send(struct socket *sock,struct msghdr *msg,
 34 struct scm_cookie *scm)
 35 {
 36 memset(scm,0,sizeof(*scm));
 37  scm->creds.uid = current->uid;
 38  scm->creds.gid = current->gid;
 39  scm->creds.pid = current->pid;
 40 if(msg->msg_controllen <=0)
 41 return0;
 42 return__scm_send(sock, msg, scm);
 43 }
 44
 45 static __inline__ voidscm_recv(struct socket *sock,struct msghdr *msg,
 46 struct scm_cookie *scm,int flags)
 47 {
 48 if(!msg->msg_control)
 49 {
 50 if(sock->passcred || scm->fp)
 51  msg->msg_flags |= MSG_CTRUNC;
 52 scm_destroy(scm);
 53 return;
 54 }
 55
 56 if(sock->passcred)
 57 put_cmsg(msg, SOL_SOCKET, SCM_CREDENTIALS,sizeof(scm->creds), &scm->creds);
 58
 59 if(!scm->fp)
 60 return;
 61
 62 scm_detach_fds(msg, scm);
 63 }
 64
 65
 66 #endif __LINUX_NET_SCM_H
 67