112 #include <net/scm.h>
142 static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)  in unix_get_secdata()  argument
144 	UNIXCB(skb).secid = scm->secid;  in unix_get_secdata()
147 static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)  in unix_set_secdata()  argument
149 	scm->secid = UNIXCB(skb).secid;  in unix_set_secdata()
152 static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)  in unix_secdata_eq()  argument
154 	return (scm->secid == UNIXCB(skb).secid);  in unix_secdata_eq()
157 static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb)  in unix_get_secdata()  argument
160 static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb)  in unix_set_secdata()  argument
163 static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb)  in unix_secdata_eq()  argument
1517 static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb)  in unix_detach_fds()  argument
1521 	scm->fp = UNIXCB(skb).fp;  in unix_detach_fds()
1524 	for (i = scm->fp->count-1; i >= 0; i--)  in unix_detach_fds()
1525 		unix_notinflight(scm->fp->user, scm->fp->fp[i]);  in unix_detach_fds()
1530 	struct scm_cookie scm;  in unix_destruct_scm()  local
1531 	memset(&scm, 0, sizeof(scm));  in unix_destruct_scm()
1532 	scm.pid  = UNIXCB(skb).pid;  in unix_destruct_scm()
1534 		unix_detach_fds(&scm, skb);  in unix_destruct_scm()
1538 	scm_destroy(&scm);  in unix_destruct_scm()
1557 static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)  in unix_attach_fds()  argument
1569 	UNIXCB(skb).fp = scm_fp_dup(scm->fp);  in unix_attach_fds()
1573 	for (i = scm->fp->count - 1; i >= 0; i--)  in unix_attach_fds()
1574 		unix_inflight(scm->fp->user, scm->fp->fp[i]);  in unix_attach_fds()
1578 static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds)  in unix_scm_to_skb()  argument
1582 	UNIXCB(skb).pid  = get_pid(scm->pid);  in unix_scm_to_skb()
1583 	UNIXCB(skb).uid = scm->creds.uid;  in unix_scm_to_skb()
1584 	UNIXCB(skb).gid = scm->creds.gid;  in unix_scm_to_skb()
1586 	unix_get_secdata(scm, skb);  in unix_scm_to_skb()
1587 	if (scm->fp && send_fds)  in unix_scm_to_skb()
1588 		err = unix_attach_fds(scm, skb);  in unix_scm_to_skb()
1618 static int maybe_init_creds(struct scm_cookie *scm,  in maybe_init_creds()  argument
1625 	err = scm_send(socket, &msg, scm, false);  in maybe_init_creds()
1630 		scm->pid = get_pid(task_tgid(current));  in maybe_init_creds()
1631 		current_uid_gid(&scm->creds.uid, &scm->creds.gid);  in maybe_init_creds()
1637 			    struct scm_cookie *scm)  in unix_skb_scm_eq()  argument
1641 	return u->pid == scm->pid &&  in unix_skb_scm_eq()
1642 	       uid_eq(u->uid, scm->creds.uid) &&  in unix_skb_scm_eq()
1643 	       gid_eq(u->gid, scm->creds.gid) &&  in unix_skb_scm_eq()
1644 	       unix_secdata_eq(scm, skb);  in unix_skb_scm_eq()
1664 	struct scm_cookie scm;  in unix_dgram_sendmsg()  local
1669 	err = scm_send(sock, msg, &scm, false);  in unix_dgram_sendmsg()
1713 	err = unix_scm_to_skb(&scm, skb, true);  in unix_dgram_sendmsg()
1837 	scm_destroy(&scm);  in unix_dgram_sendmsg()
1849 	scm_destroy(&scm);  in unix_dgram_sendmsg()
1866 	struct scm_cookie scm;  in unix_stream_sendmsg()  local
1871 	err = scm_send(sock, msg, &scm, false);  in unix_stream_sendmsg()
1912 		err = unix_scm_to_skb(&scm, skb, !fds_sent);  in unix_stream_sendmsg()
1941 	scm_destroy(&scm);  in unix_stream_sendmsg()
1953 	scm_destroy(&scm);  in unix_stream_sendmsg()
1963 	struct scm_cookie scm;  in unix_stream_sendpage()  local
2009 		err = maybe_init_creds(&scm, socket, other);  in unix_stream_sendpage()
2018 	} else if (!skb || !unix_skb_scm_eq(skb, &scm)) {  in unix_stream_sendpage()
2045 		err = unix_scm_to_skb(&scm, skb, false);  in unix_stream_sendpage()
2057 	scm_destroy(&scm);  in unix_stream_sendpage()
2069 		scm_destroy(&scm);  in unix_stream_sendpage()
2116 	struct scm_cookie scm;  in unix_dgram_recvmsg()  local
2176 	memset(&scm, 0, sizeof(scm));  in unix_dgram_recvmsg()
2178 	scm_set_cred(&scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid);  in unix_dgram_recvmsg()
2179 	unix_set_secdata(&scm, skb);  in unix_dgram_recvmsg()
2183 			unix_detach_fds(&scm, skb);  in unix_dgram_recvmsg()
2203 			scm.fp = scm_fp_dup(UNIXCB(skb).fp);  in unix_dgram_recvmsg()
2207 	scm_recv(sock, msg, &scm, flags);  in unix_dgram_recvmsg()
2278 	struct scm_cookie scm;  in unix_stream_read_generic()  local
2306 	memset(&scm, 0, sizeof(scm));  in unix_stream_read_generic()
2356 				scm_destroy(&scm);  in unix_stream_read_generic()
2380 			if (!unix_skb_scm_eq(skb, &scm))  in unix_stream_read_generic()
2384 			scm_set_cred(&scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid);  in unix_stream_read_generic()
2385 			unix_set_secdata(&scm, skb);  in unix_stream_read_generic()
2430 				unix_detach_fds(&scm, skb);  in unix_stream_read_generic()
2438 			if (scm.fp)  in unix_stream_read_generic()
2444 				scm.fp = scm_fp_dup(UNIXCB(skb).fp);  in unix_stream_read_generic()
2465 		scm_recv(sock, state->msg, &scm, flags);  in unix_stream_read_generic()
2467 		scm_destroy(&scm);  in unix_stream_read_generic()