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![Ulrich Drepper](/assets/img/avatar_default.png)
Introduce a new accept4() system call. The addition of this system call matches analogous changes in 2.6.27 (dup3(), evenfd2(), signalfd4(), inotify_init1(), epoll_create1(), pipe2()) which added new system calls that differed from analogous traditional system calls in adding a flags argument that can be used to access additional functionality. The accept4() system call is exactly the same as accept(), except that it adds a flags bit-mask argument. Two flags are initially implemented. (Most of the new system calls in 2.6.27 also had both of these flags.) SOCK_CLOEXEC causes the close-on-exec (FD_CLOEXEC) flag to be enabled for the new file descriptor returned by accept4(). This is a useful security feature to avoid leaking information in a multithreaded program where one thread is doing an accept() at the same time as another thread is doing a fork() plus exec(). More details here: http://udrepper.livejournal.com/20407.html "Secure File Descriptor Handling", Ulrich Drepper). The other flag is SOCK_NONBLOCK, which causes the O_NONBLOCK flag to be enabled on the new open file description created by accept4(). (This flag is merely a convenience, saving the use of additional calls fcntl(F_GETFL) and fcntl (F_SETFL) to achieve the same result. Here's a test program. Works on x86-32. Should work on x86-64, but I (mtk) don't have a system to hand to test with. It tests accept4() with each of the four possible combinations of SOCK_CLOEXEC and SOCK_NONBLOCK set/clear in 'flags', and verifies that the appropriate flags are set on the file descriptor/open file description returned by accept4(). I tested Ulrich's patch in this thread by applying against 2.6.28-rc2, and it passes according to my test program. /* test_accept4.c Copyright (C) 2008, Linux Foundation, written by Michael Kerrisk <mtk.manpages@gmail.com> Licensed under the GNU GPLv2 or later. */ #define _GNU_SOURCE #include <unistd.h> #include <sys/syscall.h> #include <sys/socket.h> #include <netinet/in.h> #include <stdlib.h> #include <fcntl.h> #include <stdio.h> #include <string.h> #define PORT_NUM 33333 #define die(msg) do { perror(msg); exit(EXIT_FAILURE); } while (0) /**********************************************************************/ /* The following is what we need until glibc gets a wrapper for accept4() */ /* Flags for socket(), socketpair(), accept4() */ #ifndef SOCK_CLOEXEC #define SOCK_CLOEXEC O_CLOEXEC #endif #ifndef SOCK_NONBLOCK #define SOCK_NONBLOCK O_NONBLOCK #endif #ifdef __x86_64__ #define SYS_accept4 288 #elif __i386__ #define USE_SOCKETCALL 1 #define SYS_ACCEPT4 18 #else #error "Sorry -- don't know the syscall # on this architecture" #endif static int accept4(int fd, struct sockaddr *sockaddr, socklen_t *addrlen, int flags) { printf("Calling accept4(): flags = %x", flags); if (flags != 0) { printf(" ("); if (flags & SOCK_CLOEXEC) printf("SOCK_CLOEXEC"); if ((flags & SOCK_CLOEXEC) && (flags & SOCK_NONBLOCK)) printf(" "); if (flags & SOCK_NONBLOCK) printf("SOCK_NONBLOCK"); printf(")"); } printf("\n"); #if USE_SOCKETCALL long args[6]; args[0] = fd; args[1] = (long) sockaddr; args[2] = (long) addrlen; args[3] = flags; return syscall(SYS_socketcall, SYS_ACCEPT4, args); #else return syscall(SYS_accept4, fd, sockaddr, addrlen, flags); #endif } /**********************************************************************/ static int do_test(int lfd, struct sockaddr_in *conn_addr, int closeonexec_flag, int nonblock_flag) { int connfd, acceptfd; int fdf, flf, fdf_pass, flf_pass; struct sockaddr_in claddr; socklen_t addrlen; printf("=======================================\n"); connfd = socket(AF_INET, SOCK_STREAM, 0); if (connfd == -1) die("socket"); if (connect(connfd, (struct sockaddr *) conn_addr, sizeof(struct sockaddr_in)) == -1) die("connect"); addrlen = sizeof(struct sockaddr_in); acceptfd = accept4(lfd, (struct sockaddr *) &claddr, &addrlen, closeonexec_flag | nonblock_flag); if (acceptfd == -1) { perror("accept4()"); close(connfd); return 0; } fdf = fcntl(acceptfd, F_GETFD); if (fdf == -1) die("fcntl:F_GETFD"); fdf_pass = ((fdf & FD_CLOEXEC) != 0) == ((closeonexec_flag & SOCK_CLOEXEC) != 0); printf("Close-on-exec flag is %sset (%s); ", (fdf & FD_CLOEXEC) ? "" : "not ", fdf_pass ? "OK" : "failed"); flf = fcntl(acceptfd, F_GETFL); if (flf == -1) die("fcntl:F_GETFD"); flf_pass = ((flf & O_NONBLOCK) != 0) == ((nonblock_flag & SOCK_NONBLOCK) !=0); printf("nonblock flag is %sset (%s)\n", (flf & O_NONBLOCK) ? "" : "not ", flf_pass ? "OK" : "failed"); close(acceptfd); close(connfd); printf("Test result: %s\n", (fdf_pass && flf_pass) ? "PASS" : "FAIL"); return fdf_pass && flf_pass; } static int create_listening_socket(int port_num) { struct sockaddr_in svaddr; int lfd; int optval; memset(&svaddr, 0, sizeof(struct sockaddr_in)); svaddr.sin_family = AF_INET; svaddr.sin_addr.s_addr = htonl(INADDR_ANY); svaddr.sin_port = htons(port_num); lfd = socket(AF_INET, SOCK_STREAM, 0); if (lfd == -1) die("socket"); optval = 1; if (setsockopt(lfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)) == -1) die("setsockopt"); if (bind(lfd, (struct sockaddr *) &svaddr, sizeof(struct sockaddr_in)) == -1) die("bind"); if (listen(lfd, 5) == -1) die("listen"); return lfd; } int main(int argc, char *argv[]) { struct sockaddr_in conn_addr; int lfd; int port_num; int passed; passed = 1; port_num = (argc > 1) ? atoi(argv[1]) : PORT_NUM; memset(&conn_addr, 0, sizeof(struct sockaddr_in)); conn_addr.sin_family = AF_INET; conn_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); conn_addr.sin_port = htons(port_num); lfd = create_listening_socket(port_num); if (!do_test(lfd, &conn_addr, 0, 0)) passed = 0; if (!do_test(lfd, &conn_addr, SOCK_CLOEXEC, 0)) passed = 0; if (!do_test(lfd, &conn_addr, 0, SOCK_NONBLOCK)) passed = 0; if (!do_test(lfd, &conn_addr, SOCK_CLOEXEC, SOCK_NONBLOCK)) passed = 0; close(lfd); exit(passed ? EXIT_SUCCESS : EXIT_FAILURE); } [mtk.manpages@gmail.com: rewrote changelog, updated test program] Signed-off-by: Ulrich Drepper <drepper@redhat.com> Tested-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Cc: <linux-api@vger.kernel.org> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
356 lines
12 KiB
C
356 lines
12 KiB
C
/*
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* NET An implementation of the SOCKET network access protocol.
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* This is the master header file for the Linux NET layer,
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* or, in plain English: the networking handling part of the
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* kernel.
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*
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* Version: @(#)net.h 1.0.3 05/25/93
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*
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* Authors: Orest Zborowski, <obz@Kodak.COM>
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* Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_NET_H
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#define _LINUX_NET_H
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#include <linux/socket.h>
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#include <asm/socket.h>
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#define NPROTO AF_MAX
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#define SYS_SOCKET 1 /* sys_socket(2) */
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#define SYS_BIND 2 /* sys_bind(2) */
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#define SYS_CONNECT 3 /* sys_connect(2) */
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#define SYS_LISTEN 4 /* sys_listen(2) */
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#define SYS_ACCEPT 5 /* sys_accept(2) */
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#define SYS_GETSOCKNAME 6 /* sys_getsockname(2) */
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#define SYS_GETPEERNAME 7 /* sys_getpeername(2) */
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#define SYS_SOCKETPAIR 8 /* sys_socketpair(2) */
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#define SYS_SEND 9 /* sys_send(2) */
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#define SYS_RECV 10 /* sys_recv(2) */
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#define SYS_SENDTO 11 /* sys_sendto(2) */
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#define SYS_RECVFROM 12 /* sys_recvfrom(2) */
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#define SYS_SHUTDOWN 13 /* sys_shutdown(2) */
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#define SYS_SETSOCKOPT 14 /* sys_setsockopt(2) */
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#define SYS_GETSOCKOPT 15 /* sys_getsockopt(2) */
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#define SYS_SENDMSG 16 /* sys_sendmsg(2) */
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#define SYS_RECVMSG 17 /* sys_recvmsg(2) */
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#define SYS_ACCEPT4 18 /* sys_accept4(2) */
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typedef enum {
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SS_FREE = 0, /* not allocated */
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SS_UNCONNECTED, /* unconnected to any socket */
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SS_CONNECTING, /* in process of connecting */
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SS_CONNECTED, /* connected to socket */
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SS_DISCONNECTING /* in process of disconnecting */
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} socket_state;
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#define __SO_ACCEPTCON (1 << 16) /* performed a listen */
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#ifdef __KERNEL__
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#include <linux/stringify.h>
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#include <linux/random.h>
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#include <linux/wait.h>
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#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
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struct poll_table_struct;
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struct pipe_inode_info;
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struct inode;
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struct net;
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#define SOCK_ASYNC_NOSPACE 0
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#define SOCK_ASYNC_WAITDATA 1
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#define SOCK_NOSPACE 2
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#define SOCK_PASSCRED 3
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#define SOCK_PASSSEC 4
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#ifndef ARCH_HAS_SOCKET_TYPES
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/**
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* enum sock_type - Socket types
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* @SOCK_STREAM: stream (connection) socket
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* @SOCK_DGRAM: datagram (conn.less) socket
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* @SOCK_RAW: raw socket
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* @SOCK_RDM: reliably-delivered message
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* @SOCK_SEQPACKET: sequential packet socket
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* @SOCK_DCCP: Datagram Congestion Control Protocol socket
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* @SOCK_PACKET: linux specific way of getting packets at the dev level.
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* For writing rarp and other similar things on the user level.
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*
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* When adding some new socket type please
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* grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
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* overrides this enum for binary compat reasons.
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*/
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enum sock_type {
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SOCK_STREAM = 1,
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SOCK_DGRAM = 2,
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SOCK_RAW = 3,
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SOCK_RDM = 4,
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SOCK_SEQPACKET = 5,
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SOCK_DCCP = 6,
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SOCK_PACKET = 10,
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};
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#define SOCK_MAX (SOCK_PACKET + 1)
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/* Mask which covers at least up to SOCK_MASK-1. The
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* remaining bits are used as flags. */
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#define SOCK_TYPE_MASK 0xf
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/* Flags for socket, socketpair, accept4 */
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#define SOCK_CLOEXEC O_CLOEXEC
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#ifndef SOCK_NONBLOCK
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#define SOCK_NONBLOCK O_NONBLOCK
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#endif
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#endif /* ARCH_HAS_SOCKET_TYPES */
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enum sock_shutdown_cmd {
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SHUT_RD = 0,
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SHUT_WR = 1,
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SHUT_RDWR = 2,
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};
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/**
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* struct socket - general BSD socket
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* @state: socket state (%SS_CONNECTED, etc)
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* @type: socket type (%SOCK_STREAM, etc)
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* @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
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* @ops: protocol specific socket operations
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* @fasync_list: Asynchronous wake up list
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* @file: File back pointer for gc
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* @sk: internal networking protocol agnostic socket representation
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* @wait: wait queue for several uses
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*/
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struct socket {
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socket_state state;
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short type;
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unsigned long flags;
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const struct proto_ops *ops;
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struct fasync_struct *fasync_list;
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struct file *file;
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struct sock *sk;
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wait_queue_head_t wait;
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};
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struct vm_area_struct;
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struct page;
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struct kiocb;
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struct sockaddr;
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struct msghdr;
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struct module;
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struct proto_ops {
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int family;
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struct module *owner;
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int (*release) (struct socket *sock);
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int (*bind) (struct socket *sock,
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struct sockaddr *myaddr,
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int sockaddr_len);
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int (*connect) (struct socket *sock,
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struct sockaddr *vaddr,
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int sockaddr_len, int flags);
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int (*socketpair)(struct socket *sock1,
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struct socket *sock2);
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int (*accept) (struct socket *sock,
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struct socket *newsock, int flags);
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int (*getname) (struct socket *sock,
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struct sockaddr *addr,
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int *sockaddr_len, int peer);
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unsigned int (*poll) (struct file *file, struct socket *sock,
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struct poll_table_struct *wait);
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int (*ioctl) (struct socket *sock, unsigned int cmd,
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unsigned long arg);
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int (*compat_ioctl) (struct socket *sock, unsigned int cmd,
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unsigned long arg);
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int (*listen) (struct socket *sock, int len);
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int (*shutdown) (struct socket *sock, int flags);
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int (*setsockopt)(struct socket *sock, int level,
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int optname, char __user *optval, int optlen);
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int (*getsockopt)(struct socket *sock, int level,
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int optname, char __user *optval, int __user *optlen);
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int (*compat_setsockopt)(struct socket *sock, int level,
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int optname, char __user *optval, int optlen);
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int (*compat_getsockopt)(struct socket *sock, int level,
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int optname, char __user *optval, int __user *optlen);
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int (*sendmsg) (struct kiocb *iocb, struct socket *sock,
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struct msghdr *m, size_t total_len);
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int (*recvmsg) (struct kiocb *iocb, struct socket *sock,
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struct msghdr *m, size_t total_len,
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int flags);
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int (*mmap) (struct file *file, struct socket *sock,
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struct vm_area_struct * vma);
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ssize_t (*sendpage) (struct socket *sock, struct page *page,
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int offset, size_t size, int flags);
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ssize_t (*splice_read)(struct socket *sock, loff_t *ppos,
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struct pipe_inode_info *pipe, size_t len, unsigned int flags);
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};
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struct net_proto_family {
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int family;
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int (*create)(struct net *net, struct socket *sock, int protocol);
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struct module *owner;
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};
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struct iovec;
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struct kvec;
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enum {
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SOCK_WAKE_IO,
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SOCK_WAKE_WAITD,
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SOCK_WAKE_SPACE,
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SOCK_WAKE_URG,
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};
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extern int sock_wake_async(struct socket *sk, int how, int band);
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extern int sock_register(const struct net_proto_family *fam);
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extern void sock_unregister(int family);
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extern int sock_create(int family, int type, int proto,
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struct socket **res);
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extern int sock_create_kern(int family, int type, int proto,
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struct socket **res);
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extern int sock_create_lite(int family, int type, int proto,
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struct socket **res);
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extern void sock_release(struct socket *sock);
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extern int sock_sendmsg(struct socket *sock, struct msghdr *msg,
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size_t len);
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extern int sock_recvmsg(struct socket *sock, struct msghdr *msg,
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size_t size, int flags);
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extern int sock_map_fd(struct socket *sock, int flags);
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extern struct socket *sockfd_lookup(int fd, int *err);
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#define sockfd_put(sock) fput(sock->file)
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extern int net_ratelimit(void);
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#define net_random() random32()
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#define net_srandom(seed) srandom32((__force u32)seed)
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extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
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struct kvec *vec, size_t num, size_t len);
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extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
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struct kvec *vec, size_t num,
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size_t len, int flags);
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extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
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int addrlen);
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extern int kernel_listen(struct socket *sock, int backlog);
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extern int kernel_accept(struct socket *sock, struct socket **newsock,
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int flags);
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extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
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int addrlen, int flags);
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extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
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int *addrlen);
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extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
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int *addrlen);
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extern int kernel_getsockopt(struct socket *sock, int level, int optname,
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char *optval, int *optlen);
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extern int kernel_setsockopt(struct socket *sock, int level, int optname,
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char *optval, int optlen);
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extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
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size_t size, int flags);
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extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
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extern int kernel_sock_shutdown(struct socket *sock,
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enum sock_shutdown_cmd how);
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#ifndef CONFIG_SMP
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#define SOCKOPS_WRAPPED(name) name
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#define SOCKOPS_WRAP(name, fam)
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#else
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#define SOCKOPS_WRAPPED(name) __unlocked_##name
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#define SOCKCALL_WRAP(name, call, parms, args) \
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static int __lock_##name##_##call parms \
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{ \
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int ret; \
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lock_kernel(); \
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ret = __unlocked_##name##_ops.call args ;\
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unlock_kernel(); \
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return ret; \
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}
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#define SOCKCALL_UWRAP(name, call, parms, args) \
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static unsigned int __lock_##name##_##call parms \
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{ \
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int ret; \
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lock_kernel(); \
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ret = __unlocked_##name##_ops.call args ;\
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unlock_kernel(); \
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return ret; \
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}
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#define SOCKOPS_WRAP(name, fam) \
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SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \
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SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
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(sock, uaddr, addr_len)) \
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SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
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int addr_len, int flags), \
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(sock, uaddr, addr_len, flags)) \
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SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
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(sock1, sock2)) \
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SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
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int flags), (sock, newsock, flags)) \
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SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
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int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
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SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
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(file, sock, wait)) \
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SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
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unsigned long arg), (sock, cmd, arg)) \
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SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
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unsigned long arg), (sock, cmd, arg)) \
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SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
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SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
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SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
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char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
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SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
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char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
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SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
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(iocb, sock, m, len)) \
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SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
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(iocb, sock, m, len, flags)) \
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SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
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(file, sock, vma)) \
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\
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static const struct proto_ops name##_ops = { \
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.family = fam, \
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.owner = THIS_MODULE, \
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.release = __lock_##name##_release, \
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.bind = __lock_##name##_bind, \
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.connect = __lock_##name##_connect, \
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.socketpair = __lock_##name##_socketpair, \
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.accept = __lock_##name##_accept, \
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.getname = __lock_##name##_getname, \
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.poll = __lock_##name##_poll, \
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.ioctl = __lock_##name##_ioctl, \
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.compat_ioctl = __lock_##name##_compat_ioctl, \
|
|
.listen = __lock_##name##_listen, \
|
|
.shutdown = __lock_##name##_shutdown, \
|
|
.setsockopt = __lock_##name##_setsockopt, \
|
|
.getsockopt = __lock_##name##_getsockopt, \
|
|
.sendmsg = __lock_##name##_sendmsg, \
|
|
.recvmsg = __lock_##name##_recvmsg, \
|
|
.mmap = __lock_##name##_mmap, \
|
|
};
|
|
|
|
#endif
|
|
|
|
#define MODULE_ALIAS_NETPROTO(proto) \
|
|
MODULE_ALIAS("net-pf-" __stringify(proto))
|
|
|
|
#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
|
|
MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
|
|
|
|
#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
|
|
MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
|
|
"-type-" __stringify(type))
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
#include <linux/sysctl.h>
|
|
extern struct ratelimit_state net_ratelimit_state;
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_NET_H */
|