Gleb Smirnoff 779f106aa1 Listening sockets improvements. ... o Separate fields of struct socket that belong to listening from fields that belong to normal dataflow, and unionize them. This shrinks the structure a bit. - Take out selinfo's from the socket buffers into the socket. The first reason is to support braindamaged scenario when a socket is added to kevent(2) and then listen(2) is cast on it. The second reason is that there is future plan to make socket buffers pluggable, so that for a dataflow socket a socket buffer can be changed, and in this case we also want to keep same selinfos through the lifetime of a socket. - Remove struct struct so_accf. Since now listening stuff no longer affects struct socket size, just move its fields into listening part of the union. - Provide sol_upcall field and enforce that so_upcall_set() may be called only on a dataflow socket, which has buffers, and for listening sockets provide solisten_upcall_set(). o Remove ACCEPT_LOCK() global. - Add a mutex to socket, to be used instead of socket buffer lock to lock fields of struct socket that don't belong to a socket buffer. - Allow to acquire two socket locks, but the first one must belong to a listening socket. - Make soref()/sorele() to use atomic(9). This allows in some situations to do soref() without owning socket lock. There is place for improvement here, it is possible to make sorele() also to lock optionally. - Most protocols aren't touched by this change, except UNIX local sockets. See below for more information. o Reduce copy-and-paste in kernel modules that accept connections from listening sockets: provide function solisten_dequeue(), and use it in the following modules: ctl(4), iscsi(4), ng_btsocket(4), ng_ksocket(4), infiniband, rpc. o UNIX local sockets. - Removal of ACCEPT_LOCK() global uncovered several races in the UNIX local sockets. Most races exist around spawning a new socket, when we are connecting to a local listening socket. To cover them, we need to hold locks on both PCBs when spawning a third one. This means holding them across sonewconn(). This creates a LOR between pcb locks and unp_list_lock. - To fix the new LOR, abandon the global unp_list_lock in favor of global unp_link_lock. Indeed, separating these two locks didn't provide us any extra parralelism in the UNIX sockets. - Now call into uipc_attach() may happen with unp_link_lock hold if, we are accepting, or without unp_link_lock in case if we are just creating a socket. - Another problem in UNIX sockets is that uipc_close() basicly did nothing for a listening socket. The vnode remained opened for connections. This is fixed by removing vnode in uipc_close(). Maybe the right way would be to do it for all sockets (not only listening), simply move the vnode teardown from uipc_detach() to uipc_close()? Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D9770		2017-06-08 21:30:34 +00:00
..
rpcsec_gss
auth_none.c
auth_unix.c
auth.h
authunix_prot.c
clnt_bck.c
clnt_dg.c
clnt_rc.c	Fix a crash during unmount of an NFSv4.1 mount.	2017-04-10 22:47:18 +00:00
clnt_stat.h
clnt_vc.c	Fix the client side krpc from doing TCP reconnects for ERESTART from sosend().	2017-05-07 12:12:45 +00:00
clnt.h	Remove register keyword from sys/ and ANSIfy prototypes	2017-05-17 00:34:34 +00:00
getnetconfig.c
krpc.h
netconfig.h
nettype.h
pmap_prot.h
replay.c
replay.h
rpc_callmsg.c
rpc_com.h
rpc_generic.c	* limit size of buffers to RPC_MAXDATASIZE	2017-06-01 06:12:25 +00:00
rpc_msg.h
rpc_prot.c
rpc.h
rpcb_clnt.c	* limit size of buffers to RPC_MAXDATASIZE	2017-06-01 06:12:25 +00:00
rpcb_clnt.h
rpcb_prot.c	* limit size of buffers to RPC_MAXDATASIZE	2017-06-01 06:12:25 +00:00
rpcb_prot.h
rpcm_subs.h
rpcsec_gss.h
svc_auth_unix.c
svc_auth.c
svc_auth.h
svc_dg.c
svc_generic.c
svc_vc.c	Listening sockets improvements.	2017-06-08 21:30:34 +00:00
svc.c
svc.h
types.h
xdr.h