| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * PF_INET protocol family socket handler. |
| * |
| * Authors: Ross Biro |
| * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| * Florian La Roche, <flla@stud.uni-sb.de> |
| * Alan Cox, <A.Cox@swansea.ac.uk> |
| * |
| * Changes (see also sock.c) |
| * |
| * piggy, |
| * Karl Knutson : Socket protocol table |
| * A.N.Kuznetsov : Socket death error in accept(). |
| * John Richardson : Fix non blocking error in connect() |
| * so sockets that fail to connect |
| * don't return -EINPROGRESS. |
| * Alan Cox : Asynchronous I/O support |
| * Alan Cox : Keep correct socket pointer on sock |
| * structures |
| * when accept() ed |
| * Alan Cox : Semantics of SO_LINGER aren't state |
| * moved to close when you look carefully. |
| * With this fixed and the accept bug fixed |
| * some RPC stuff seems happier. |
| * Niibe Yutaka : 4.4BSD style write async I/O |
| * Alan Cox, |
| * Tony Gale : Fixed reuse semantics. |
| * Alan Cox : bind() shouldn't abort existing but dead |
| * sockets. Stops FTP netin:.. I hope. |
| * Alan Cox : bind() works correctly for RAW sockets. |
| * Note that FreeBSD at least was broken |
| * in this respect so be careful with |
| * compatibility tests... |
| * Alan Cox : routing cache support |
| * Alan Cox : memzero the socket structure for |
| * compactness. |
| * Matt Day : nonblock connect error handler |
| * Alan Cox : Allow large numbers of pending sockets |
| * (eg for big web sites), but only if |
| * specifically application requested. |
| * Alan Cox : New buffering throughout IP. Used |
| * dumbly. |
| * Alan Cox : New buffering now used smartly. |
| * Alan Cox : BSD rather than common sense |
| * interpretation of listen. |
| * Germano Caronni : Assorted small races. |
| * Alan Cox : sendmsg/recvmsg basic support. |
| * Alan Cox : Only sendmsg/recvmsg now supported. |
| * Alan Cox : Locked down bind (see security list). |
| * Alan Cox : Loosened bind a little. |
| * Mike McLagan : ADD/DEL DLCI Ioctls |
| * Willy Konynenberg : Transparent proxying support. |
| * David S. Miller : New socket lookup architecture. |
| * Some other random speedups. |
| * Cyrus Durgin : Cleaned up file for kmod hacks. |
| * Andi Kleen : Fix inet_stream_connect TCP race. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <linux/err.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/sched.h> |
| #include <linux/timer.h> |
| #include <linux/string.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/capability.h> |
| #include <linux/fcntl.h> |
| #include <linux/mm.h> |
| #include <linux/interrupt.h> |
| #include <linux/stat.h> |
| #include <linux/init.h> |
| #include <linux/poll.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/random.h> |
| #include <linux/slab.h> |
| |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| |
| #include <linux/inet.h> |
| #include <linux/igmp.h> |
| #include <linux/inetdevice.h> |
| #include <linux/netdevice.h> |
| #include <net/checksum.h> |
| #include <net/ip.h> |
| #include <net/protocol.h> |
| #include <net/arp.h> |
| #include <net/route.h> |
| #include <net/ip_fib.h> |
| #include <net/inet_connection_sock.h> |
| #include <net/tcp.h> |
| #include <net/udp.h> |
| #include <net/udplite.h> |
| #include <net/ping.h> |
| #include <linux/skbuff.h> |
| #include <net/sock.h> |
| #include <net/raw.h> |
| #include <net/icmp.h> |
| #include <net/ipip.h> |
| #include <net/inet_common.h> |
| #include <net/xfrm.h> |
| #include <net/net_namespace.h> |
| #ifdef CONFIG_IP_MROUTE |
| #include <linux/mroute.h> |
| #endif |
| |
| |
| /* The inetsw table contains everything that inet_create needs to |
| * build a new socket. |
| */ |
| static struct list_head inetsw[SOCK_MAX]; |
| static DEFINE_SPINLOCK(inetsw_lock); |
| |
| struct ipv4_config ipv4_config; |
| EXPORT_SYMBOL(ipv4_config); |
| |
| /* New destruction routine */ |
| |
| void inet_sock_destruct(struct sock *sk) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| __skb_queue_purge(&sk->sk_receive_queue); |
| __skb_queue_purge(&sk->sk_error_queue); |
| |
| sk_mem_reclaim(sk); |
| |
| if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) { |
| pr_err("Attempt to release TCP socket in state %d %p\n", |
| sk->sk_state, sk); |
| return; |
| } |
| if (!sock_flag(sk, SOCK_DEAD)) { |
| pr_err("Attempt to release alive inet socket %p\n", sk); |
| return; |
| } |
| |
| WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| WARN_ON(sk->sk_wmem_queued); |
| WARN_ON(sk->sk_forward_alloc); |
| |
| kfree(rcu_dereference_protected(inet->inet_opt, 1)); |
| dst_release(rcu_dereference_check(sk->sk_dst_cache, 1)); |
| sk_refcnt_debug_dec(sk); |
| } |
| EXPORT_SYMBOL(inet_sock_destruct); |
| |
| /* |
| * The routines beyond this point handle the behaviour of an AF_INET |
| * socket object. Mostly it punts to the subprotocols of IP to do |
| * the work. |
| */ |
| |
| /* |
| * Automatically bind an unbound socket. |
| */ |
| |
| static int inet_autobind(struct sock *sk) |
| { |
| struct inet_sock *inet; |
| /* We may need to bind the socket. */ |
| lock_sock(sk); |
| inet = inet_sk(sk); |
| if (!inet->inet_num) { |
| if (sk->sk_prot->get_port(sk, 0)) { |
| release_sock(sk); |
| return -EAGAIN; |
| } |
| inet->inet_sport = htons(inet->inet_num); |
| } |
| release_sock(sk); |
| return 0; |
| } |
| |
| /* |
| * Move a socket into listening state. |
| */ |
| int inet_listen(struct socket *sock, int backlog) |
| { |
| struct sock *sk = sock->sk; |
| unsigned char old_state; |
| int err; |
| |
| lock_sock(sk); |
| |
| err = -EINVAL; |
| if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM) |
| goto out; |
| |
| old_state = sk->sk_state; |
| if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN))) |
| goto out; |
| |
| /* Really, if the socket is already in listen state |
| * we can only allow the backlog to be adjusted. |
| */ |
| if (old_state != TCP_LISTEN) { |
| err = inet_csk_listen_start(sk, backlog); |
| if (err) |
| goto out; |
| } |
| sk->sk_max_ack_backlog = backlog; |
| err = 0; |
| |
| out: |
| release_sock(sk); |
| return err; |
| } |
| EXPORT_SYMBOL(inet_listen); |
| |
| u32 inet_ehash_secret __read_mostly; |
| EXPORT_SYMBOL(inet_ehash_secret); |
| |
| /* |
| * inet_ehash_secret must be set exactly once |
| */ |
| void build_ehash_secret(void) |
| { |
| u32 rnd; |
| |
| do { |
| get_random_bytes(&rnd, sizeof(rnd)); |
| } while (rnd == 0); |
| |
| cmpxchg(&inet_ehash_secret, 0, rnd); |
| } |
| EXPORT_SYMBOL(build_ehash_secret); |
| |
| static inline int inet_netns_ok(struct net *net, int protocol) |
| { |
| int hash; |
| const struct net_protocol *ipprot; |
| |
| if (net_eq(net, &init_net)) |
| return 1; |
| |
| hash = protocol & (MAX_INET_PROTOS - 1); |
| ipprot = rcu_dereference(inet_protos[hash]); |
| |
| if (ipprot == NULL) |
| /* raw IP is OK */ |
| return 1; |
| return ipprot->netns_ok; |
| } |
| |
| /* |
| * Create an inet socket. |
| */ |
| |
| static int inet_create(struct net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| struct sock *sk; |
| struct inet_protosw *answer; |
| struct inet_sock *inet; |
| struct proto *answer_prot; |
| unsigned char answer_flags; |
| char answer_no_check; |
| int try_loading_module = 0; |
| int err; |
| |
| if (unlikely(!inet_ehash_secret)) |
| if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
| build_ehash_secret(); |
| |
| sock->state = SS_UNCONNECTED; |
| |
| /* Look for the requested type/protocol pair. */ |
| lookup_protocol: |
| err = -ESOCKTNOSUPPORT; |
| rcu_read_lock(); |
| list_for_each_entry_rcu(answer, &inetsw[sock->type], list) { |
| |
| err = 0; |
| /* Check the non-wild match. */ |
| if (protocol == answer->protocol) { |
| if (protocol != IPPROTO_IP) |
| break; |
| } else { |
| /* Check for the two wild cases. */ |
| if (IPPROTO_IP == protocol) { |
| protocol = answer->protocol; |
| break; |
| } |
| if (IPPROTO_IP == answer->protocol) |
| break; |
| } |
| err = -EPROTONOSUPPORT; |
| } |
| |
| if (unlikely(err)) { |
| if (try_loading_module < 2) { |
| rcu_read_unlock(); |
| /* |
| * Be more specific, e.g. net-pf-2-proto-132-type-1 |
| * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM) |
| */ |
| if (++try_loading_module == 1) |
| request_module("net-pf-%d-proto-%d-type-%d", |
| PF_INET, protocol, sock->type); |
| /* |
| * Fall back to generic, e.g. net-pf-2-proto-132 |
| * (net-pf-PF_INET-proto-IPPROTO_SCTP) |
| */ |
| else |
| request_module("net-pf-%d-proto-%d", |
| PF_INET, protocol); |
| goto lookup_protocol; |
| } else |
| goto out_rcu_unlock; |
| } |
| |
| err = -EPERM; |
| if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW)) |
| goto out_rcu_unlock; |
| |
| err = -EAFNOSUPPORT; |
| if (!inet_netns_ok(net, protocol)) |
| goto out_rcu_unlock; |
| |
| sock->ops = answer->ops; |
| answer_prot = answer->prot; |
| answer_no_check = answer->no_check; |
| answer_flags = answer->flags; |
| rcu_read_unlock(); |
| |
| WARN_ON(answer_prot->slab == NULL); |
| |
| err = -ENOBUFS; |
| sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot); |
| if (sk == NULL) |
| goto out; |
| |
| err = 0; |
| sk->sk_no_check = answer_no_check; |
| if (INET_PROTOSW_REUSE & answer_flags) |
| sk->sk_reuse = 1; |
| |
| inet = inet_sk(sk); |
| inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0; |
| |
| inet->nodefrag = 0; |
| |
| if (SOCK_RAW == sock->type) { |
| inet->inet_num = protocol; |
| if (IPPROTO_RAW == protocol) |
| inet->hdrincl = 1; |
| } |
| |
| if (ipv4_config.no_pmtu_disc) |
| inet->pmtudisc = IP_PMTUDISC_DONT; |
| else |
| inet->pmtudisc = IP_PMTUDISC_WANT; |
| |
| inet->inet_id = 0; |
| |
| sock_init_data(sock, sk); |
| |
| sk->sk_destruct = inet_sock_destruct; |
| sk->sk_protocol = protocol; |
| sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; |
| |
| inet->uc_ttl = -1; |
| inet->mc_loop = 1; |
| inet->mc_ttl = 1; |
| inet->mc_all = 1; |
| inet->mc_index = 0; |
| inet->mc_list = NULL; |
| |
| sk_refcnt_debug_inc(sk); |
| |
| if (inet->inet_num) { |
| /* It assumes that any protocol which allows |
| * the user to assign a number at socket |
| * creation time automatically |
| * shares. |
| */ |
| inet->inet_sport = htons(inet->inet_num); |
| /* Add to protocol hash chains. */ |
| sk->sk_prot->hash(sk); |
| } |
| |
| if (sk->sk_prot->init) { |
| err = sk->sk_prot->init(sk); |
| if (err) |
| sk_common_release(sk); |
| } |
| out: |
| return err; |
| out_rcu_unlock: |
| rcu_read_unlock(); |
| goto out; |
| } |
| |
| |
| /* |
| * The peer socket should always be NULL (or else). When we call this |
| * function we are destroying the object and from then on nobody |
| * should refer to it. |
| */ |
| int inet_release(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| |
| if (sk) { |
| long timeout; |
| |
| sock_rps_reset_flow(sk); |
| |
| /* Applications forget to leave groups before exiting */ |
| ip_mc_drop_socket(sk); |
| |
| /* If linger is set, we don't return until the close |
| * is complete. Otherwise we return immediately. The |
| * actually closing is done the same either way. |
| * |
| * If the close is due to the process exiting, we never |
| * linger.. |
| */ |
| timeout = 0; |
| if (sock_flag(sk, SOCK_LINGER) && |
| !(current->flags & PF_EXITING)) |
| timeout = sk->sk_lingertime; |
| sock->sk = NULL; |
| sk->sk_prot->close(sk, timeout); |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(inet_release); |
| |
| /* It is off by default, see below. */ |
| int sysctl_ip_nonlocal_bind __read_mostly; |
| EXPORT_SYMBOL(sysctl_ip_nonlocal_bind); |
| |
| int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| { |
| struct sockaddr_in *addr = (struct sockaddr_in *)uaddr; |
| struct sock *sk = sock->sk; |
| struct inet_sock *inet = inet_sk(sk); |
| unsigned short snum; |
| int chk_addr_ret; |
| int err; |
| |
| /* If the socket has its own bind function then use it. (RAW) */ |
| if (sk->sk_prot->bind) { |
| err = sk->sk_prot->bind(sk, uaddr, addr_len); |
| goto out; |
| } |
| err = -EINVAL; |
| if (addr_len < sizeof(struct sockaddr_in)) |
| goto out; |
| |
| if (addr->sin_family != AF_INET) |
| goto out; |
| |
| chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr); |
| |
| /* Not specified by any standard per-se, however it breaks too |
| * many applications when removed. It is unfortunate since |
| * allowing applications to make a non-local bind solves |
| * several problems with systems using dynamic addressing. |
| * (ie. your servers still start up even if your ISDN link |
| * is temporarily down) |
| */ |
| err = -EADDRNOTAVAIL; |
| if (!sysctl_ip_nonlocal_bind && |
| !(inet->freebind || inet->transparent) && |
| addr->sin_addr.s_addr != htonl(INADDR_ANY) && |
| chk_addr_ret != RTN_LOCAL && |
| chk_addr_ret != RTN_MULTICAST && |
| chk_addr_ret != RTN_BROADCAST) |
| goto out; |
| |
| snum = ntohs(addr->sin_port); |
| err = -EACCES; |
| if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) |
| goto out; |
| |
| /* We keep a pair of addresses. rcv_saddr is the one |
| * used by hash lookups, and saddr is used for transmit. |
| * |
| * In the BSD API these are the same except where it |
| * would be illegal to use them (multicast/broadcast) in |
| * which case the sending device address is used. |
| */ |
| lock_sock(sk); |
| |
| /* Check these errors (active socket, double bind). */ |
| err = -EINVAL; |
| if (sk->sk_state != TCP_CLOSE || inet->inet_num) |
| goto out_release_sock; |
| |
| inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; |
| if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) |
| inet->inet_saddr = 0; /* Use device */ |
| |
| /* Make sure we are allowed to bind here. */ |
| if (sk->sk_prot->get_port(sk, snum)) { |
| inet->inet_saddr = inet->inet_rcv_saddr = 0; |
| err = -EADDRINUSE; |
| goto out_release_sock; |
| } |
| |
| if (inet->inet_rcv_saddr) |
| sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
| if (snum) |
| sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
| inet->inet_sport = htons(inet->inet_num); |
| inet->inet_daddr = 0; |
| inet->inet_dport = 0; |
| sk_dst_reset(sk); |
| err = 0; |
| out_release_sock: |
| release_sock(sk); |
| out: |
| return err; |
| } |
| EXPORT_SYMBOL(inet_bind); |
| |
| int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, |
| int addr_len, int flags) |
| { |
| struct sock *sk = sock->sk; |
| |
| if (addr_len < sizeof(uaddr->sa_family)) |
| return -EINVAL; |
| if (uaddr->sa_family == AF_UNSPEC) |
| return sk->sk_prot->disconnect(sk, flags); |
| |
| if (!inet_sk(sk)->inet_num && inet_autobind(sk)) |
| return -EAGAIN; |
| return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len); |
| } |
| EXPORT_SYMBOL(inet_dgram_connect); |
| |
| static long inet_wait_for_connect(struct sock *sk, long timeo) |
| { |
| DEFINE_WAIT(wait); |
| |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| |
| /* Basic assumption: if someone sets sk->sk_err, he _must_ |
| * change state of the socket from TCP_SYN_*. |
| * Connect() does not allow to get error notifications |
| * without closing the socket. |
| */ |
| while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { |
| release_sock(sk); |
| timeo = schedule_timeout(timeo); |
| lock_sock(sk); |
| if (signal_pending(current) || !timeo) |
| break; |
| prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
| } |
| finish_wait(sk_sleep(sk), &wait); |
| return timeo; |
| } |
| |
| /* |
| * Connect to a remote host. There is regrettably still a little |
| * TCP 'magic' in here. |
| */ |
| int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
| int addr_len, int flags) |
| { |
| struct sock *sk = sock->sk; |
| int err; |
| long timeo; |
| |
| if (addr_len < sizeof(uaddr->sa_family)) |
| return -EINVAL; |
| |
| lock_sock(sk); |
| |
| if (uaddr->sa_family == AF_UNSPEC) { |
| err = sk->sk_prot->disconnect(sk, flags); |
| sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; |
| goto out; |
| } |
| |
| switch (sock->state) { |
| default: |
| err = -EINVAL; |
| goto out; |
| case SS_CONNECTED: |
| err = -EISCONN; |
| goto out; |
| case SS_CONNECTING: |
| err = -EALREADY; |
| /* Fall out of switch with err, set for this state */ |
| break; |
| case SS_UNCONNECTED: |
| err = -EISCONN; |
| if (sk->sk_state != TCP_CLOSE) |
| goto out; |
| |
| err = sk->sk_prot->connect(sk, uaddr, addr_len); |
| if (err < 0) |
| goto out; |
| |
| sock->state = SS_CONNECTING; |
| |
| /* Just entered SS_CONNECTING state; the only |
| * difference is that return value in non-blocking |
| * case is EINPROGRESS, rather than EALREADY. |
| */ |
| err = -EINPROGRESS; |
| break; |
| } |
| |
| timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
| |
| if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { |
| /* Error code is set above */ |
| if (!timeo || !inet_wait_for_connect(sk, timeo)) |
| goto out; |
| |
| err = sock_intr_errno(timeo); |
| if (signal_pending(current)) |
| goto out; |
| } |
| |
| /* Connection was closed by RST, timeout, ICMP error |
| * or another process disconnected us. |
| */ |
| if (sk->sk_state == TCP_CLOSE) |
| goto sock_error; |
| |
| /* sk->sk_err may be not zero now, if RECVERR was ordered by user |
| * and error was received after socket entered established state. |
| * Hence, it is handled normally after connect() return successfully. |
| */ |
| |
| sock->state = SS_CONNECTED; |
| err = 0; |
| out: |
| release_sock(sk); |
| return err; |
| |
| sock_error: |
| err = sock_error(sk) ? : -ECONNABORTED; |
| sock->state = SS_UNCONNECTED; |
| if (sk->sk_prot->disconnect(sk, flags)) |
| sock->state = SS_DISCONNECTING; |
| goto out; |
| } |
| EXPORT_SYMBOL(inet_stream_connect); |
| |
| /* |
| * Accept a pending connection. The TCP layer now gives BSD semantics. |
| */ |
| |
| int inet_accept(struct socket *sock, struct socket *newsock, int flags) |
| { |
| struct sock *sk1 = sock->sk; |
| int err = -EINVAL; |
| struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err); |
| |
| if (!sk2) |
| goto do_err; |
| |
| lock_sock(sk2); |
| |
| WARN_ON(!((1 << sk2->sk_state) & |
| (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE))); |
| |
| sock_graft(sk2, newsock); |
| |
| newsock->state = SS_CONNECTED; |
| err = 0; |
| release_sock(sk2); |
| do_err: |
| return err; |
| } |
| EXPORT_SYMBOL(inet_accept); |
| |
| |
| /* |
| * This does both peername and sockname. |
| */ |
| int inet_getname(struct socket *sock, struct sockaddr *uaddr, |
| int *uaddr_len, int peer) |
| { |
| struct sock *sk = sock->sk; |
| struct inet_sock *inet = inet_sk(sk); |
| DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr); |
| |
| sin->sin_family = AF_INET; |
| if (peer) { |
| if (!inet->inet_dport || |
| (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && |
| peer == 1)) |
| return -ENOTCONN; |
| sin->sin_port = inet->inet_dport; |
| sin->sin_addr.s_addr = inet->inet_daddr; |
| } else { |
| __be32 addr = inet->inet_rcv_saddr; |
| if (!addr) |
| addr = inet->inet_saddr; |
| sin->sin_port = inet->inet_sport; |
| sin->sin_addr.s_addr = addr; |
| } |
| memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| *uaddr_len = sizeof(*sin); |
| return 0; |
| } |
| EXPORT_SYMBOL(inet_getname); |
| |
| int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
| size_t size) |
| { |
| struct sock *sk = sock->sk; |
| |
| sock_rps_record_flow(sk); |
| |
| /* We may need to bind the socket. */ |
| if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && |
| inet_autobind(sk)) |
| return -EAGAIN; |
| |
| return sk->sk_prot->sendmsg(iocb, sk, msg, size); |
| } |
| EXPORT_SYMBOL(inet_sendmsg); |
| |
| ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset, |
| size_t size, int flags) |
| { |
| struct sock *sk = sock->sk; |
| |
| sock_rps_record_flow(sk); |
| |
| /* We may need to bind the socket. */ |
| if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind && |
| inet_autobind(sk)) |
| return -EAGAIN; |
| |
| if (sk->sk_prot->sendpage) |
| return sk->sk_prot->sendpage(sk, page, offset, size, flags); |
| return sock_no_sendpage(sock, page, offset, size, flags); |
| } |
| EXPORT_SYMBOL(inet_sendpage); |
| |
| int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
| size_t size, int flags) |
| { |
| struct sock *sk = sock->sk; |
| int addr_len = 0; |
| int err; |
| |
| sock_rps_record_flow(sk); |
| |
| err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, |
| flags & ~MSG_DONTWAIT, &addr_len); |
| if (err >= 0) |
| msg->msg_namelen = addr_len; |
| return err; |
| } |
| EXPORT_SYMBOL(inet_recvmsg); |
| |
| int inet_shutdown(struct socket *sock, int how) |
| { |
| struct sock *sk = sock->sk; |
| int err = 0; |
| |
| /* This should really check to make sure |
| * the socket is a TCP socket. (WHY AC...) |
| */ |
| how++; /* maps 0->1 has the advantage of making bit 1 rcvs and |
| 1->2 bit 2 snds. |
| 2->3 */ |
| if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */ |
| return -EINVAL; |
| |
| lock_sock(sk); |
| if (sock->state == SS_CONNECTING) { |
| if ((1 << sk->sk_state) & |
| (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) |
| sock->state = SS_DISCONNECTING; |
| else |
| sock->state = SS_CONNECTED; |
| } |
| |
| switch (sk->sk_state) { |
| case TCP_CLOSE: |
| err = -ENOTCONN; |
| /* Hack to wake up other listeners, who can poll for |
| POLLHUP, even on eg. unconnected UDP sockets -- RR */ |
| default: |
| sk->sk_shutdown |= how; |
| if (sk->sk_prot->shutdown) |
| sk->sk_prot->shutdown(sk, how); |
| break; |
| |
| /* Remaining two branches are temporary solution for missing |
| * close() in multithreaded environment. It is _not_ a good idea, |
| * but we have no choice until close() is repaired at VFS level. |
| */ |
| case TCP_LISTEN: |
| if (!(how & RCV_SHUTDOWN)) |
| break; |
| /* Fall through */ |
| case TCP_SYN_SENT: |
| err = sk->sk_prot->disconnect(sk, O_NONBLOCK); |
| sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; |
| break; |
| } |
| |
| /* Wake up anyone sleeping in poll. */ |
| sk->sk_state_change(sk); |
| release_sock(sk); |
| return err; |
| } |
| EXPORT_SYMBOL(inet_shutdown); |
| |
| /* |
| * ioctl() calls you can issue on an INET socket. Most of these are |
| * device configuration and stuff and very rarely used. Some ioctls |
| * pass on to the socket itself. |
| * |
| * NOTE: I like the idea of a module for the config stuff. ie ifconfig |
| * loads the devconfigure module does its configuring and unloads it. |
| * There's a good 20K of config code hanging around the kernel. |
| */ |
| |
| int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| { |
| struct sock *sk = sock->sk; |
| int err = 0; |
| struct net *net = sock_net(sk); |
| |
| switch (cmd) { |
| case SIOCGSTAMP: |
| err = sock_get_timestamp(sk, (struct timeval __user *)arg); |
| break; |
| case SIOCGSTAMPNS: |
| err = sock_get_timestampns(sk, (struct timespec __user *)arg); |
| break; |
| case SIOCADDRT: |
| case SIOCDELRT: |
| case SIOCRTMSG: |
| err = ip_rt_ioctl(net, cmd, (void __user *)arg); |
| break; |
| case SIOCDARP: |
| case SIOCGARP: |
| case SIOCSARP: |
| err = arp_ioctl(net, cmd, (void __user *)arg); |
| break; |
| case SIOCGIFADDR: |
| case SIOCSIFADDR: |
| case SIOCGIFBRDADDR: |
| case SIOCSIFBRDADDR: |
| case SIOCGIFNETMASK: |
| case SIOCSIFNETMASK: |
| case SIOCGIFDSTADDR: |
| case SIOCSIFDSTADDR: |
| case SIOCSIFPFLAGS: |
| case SIOCGIFPFLAGS: |
| case SIOCSIFFLAGS: |
| err = devinet_ioctl(net, cmd, (void __user *)arg); |
| break; |
| default: |
| if (sk->sk_prot->ioctl) |
| err = sk->sk_prot->ioctl(sk, cmd, arg); |
| else |
| err = -ENOIOCTLCMD; |
| break; |
| } |
| return err; |
| } |
| EXPORT_SYMBOL(inet_ioctl); |
| |
| #ifdef CONFIG_COMPAT |
| int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| { |
| struct sock *sk = sock->sk; |
| int err = -ENOIOCTLCMD; |
| |
| if (sk->sk_prot->compat_ioctl) |
| err = sk->sk_prot->compat_ioctl(sk, cmd, arg); |
| |
| return err; |
| } |
| #endif |
| |
| const struct proto_ops inet_stream_ops = { |
| .family = PF_INET, |
| .owner = THIS_MODULE, |
| .release = inet_release, |
| .bind = inet_bind, |
| .connect = inet_stream_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = inet_accept, |
| .getname = inet_getname, |
| .poll = tcp_poll, |
| .ioctl = inet_ioctl, |
| .listen = inet_listen, |
| .shutdown = inet_shutdown, |
| .setsockopt = sock_common_setsockopt, |
| .getsockopt = sock_common_getsockopt, |
| .sendmsg = inet_sendmsg, |
| .recvmsg = inet_recvmsg, |
| .mmap = sock_no_mmap, |
| .sendpage = inet_sendpage, |
| .splice_read = tcp_splice_read, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_sock_common_setsockopt, |
| .compat_getsockopt = compat_sock_common_getsockopt, |
| .compat_ioctl = inet_compat_ioctl, |
| #endif |
| }; |
| EXPORT_SYMBOL(inet_stream_ops); |
| |
| const struct proto_ops inet_dgram_ops = { |
| .family = PF_INET, |
| .owner = THIS_MODULE, |
| .release = inet_release, |
| .bind = inet_bind, |
| .connect = inet_dgram_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = sock_no_accept, |
| .getname = inet_getname, |
| .poll = udp_poll, |
| .ioctl = inet_ioctl, |
| .listen = sock_no_listen, |
| .shutdown = inet_shutdown, |
| .setsockopt = sock_common_setsockopt, |
| .getsockopt = sock_common_getsockopt, |
| .sendmsg = inet_sendmsg, |
| .recvmsg = inet_recvmsg, |
| .mmap = sock_no_mmap, |
| .sendpage = inet_sendpage, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_sock_common_setsockopt, |
| .compat_getsockopt = compat_sock_common_getsockopt, |
| .compat_ioctl = inet_compat_ioctl, |
| #endif |
| }; |
| EXPORT_SYMBOL(inet_dgram_ops); |
| |
| /* |
| * For SOCK_RAW sockets; should be the same as inet_dgram_ops but without |
| * udp_poll |
| */ |
| static const struct proto_ops inet_sockraw_ops = { |
| .family = PF_INET, |
| .owner = THIS_MODULE, |
| .release = inet_release, |
| .bind = inet_bind, |
| .connect = inet_dgram_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = sock_no_accept, |
| .getname = inet_getname, |
| .poll = datagram_poll, |
| .ioctl = inet_ioctl, |
| .listen = sock_no_listen, |
| .shutdown = inet_shutdown, |
| .setsockopt = sock_common_setsockopt, |
| .getsockopt = sock_common_getsockopt, |
| .sendmsg = inet_sendmsg, |
| .recvmsg = inet_recvmsg, |
| .mmap = sock_no_mmap, |
| .sendpage = inet_sendpage, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_sock_common_setsockopt, |
| .compat_getsockopt = compat_sock_common_getsockopt, |
| .compat_ioctl = inet_compat_ioctl, |
| #endif |
| }; |
| |
| static const struct net_proto_family inet_family_ops = { |
| .family = PF_INET, |
| .create = inet_create, |
| .owner = THIS_MODULE, |
| }; |
| |
| /* Upon startup we insert all the elements in inetsw_array[] into |
| * the linked list inetsw. |
| */ |
| static struct inet_protosw inetsw_array[] = |
| { |
| { |
| .type = SOCK_STREAM, |
| .protocol = IPPROTO_TCP, |
| .prot = &tcp_prot, |
| .ops = &inet_stream_ops, |
| .no_check = 0, |
| .flags = INET_PROTOSW_PERMANENT | |
| INET_PROTOSW_ICSK, |
| }, |
| |
| { |
| .type = SOCK_DGRAM, |
| .protocol = IPPROTO_UDP, |
| .prot = &udp_prot, |
| .ops = &inet_dgram_ops, |
| .no_check = UDP_CSUM_DEFAULT, |
| .flags = INET_PROTOSW_PERMANENT, |
| }, |
| |
| { |
| .type = SOCK_DGRAM, |
| .protocol = IPPROTO_ICMP, |
| .prot = &ping_prot, |
| .ops = &inet_dgram_ops, |
| .no_check = UDP_CSUM_DEFAULT, |
| .flags = INET_PROTOSW_REUSE, |
| }, |
| |
| { |
| .type = SOCK_RAW, |
| .protocol = IPPROTO_IP, /* wild card */ |
| .prot = &raw_prot, |
| .ops = &inet_sockraw_ops, |
| .no_check = UDP_CSUM_DEFAULT, |
| .flags = INET_PROTOSW_REUSE, |
| } |
| }; |
| |
| #define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array) |
| |
| void inet_register_protosw(struct inet_protosw *p) |
| { |
| struct list_head *lh; |
| struct inet_protosw *answer; |
| int protocol = p->protocol; |
| struct list_head *last_perm; |
| |
| spin_lock_bh(&inetsw_lock); |
| |
| if (p->type >= SOCK_MAX) |
| goto out_illegal; |
| |
| /* If we are trying to override a permanent protocol, bail. */ |
| answer = NULL; |
| last_perm = &inetsw[p->type]; |
| list_for_each(lh, &inetsw[p->type]) { |
| answer = list_entry(lh, struct inet_protosw, list); |
| |
| /* Check only the non-wild match. */ |
| if (INET_PROTOSW_PERMANENT & answer->flags) { |
| if (protocol == answer->protocol) |
| break; |
| last_perm = lh; |
| } |
| |
| answer = NULL; |
| } |
| if (answer) |
| goto out_permanent; |
| |
| /* Add the new entry after the last permanent entry if any, so that |
| * the new entry does not override a permanent entry when matched with |
| * a wild-card protocol. But it is allowed to override any existing |
| * non-permanent entry. This means that when we remove this entry, the |
| * system automatically returns to the old behavior. |
| */ |
| list_add_rcu(&p->list, last_perm); |
| out: |
| spin_unlock_bh(&inetsw_lock); |
| |
| return; |
| |
| out_permanent: |
| printk(KERN_ERR "Attempt to override permanent protocol %d.\n", |
| protocol); |
| goto out; |
| |
| out_illegal: |
| printk(KERN_ERR |
| "Ignoring attempt to register invalid socket type %d.\n", |
| p->type); |
| goto out; |
| } |
| EXPORT_SYMBOL(inet_register_protosw); |
| |
| void inet_unregister_protosw(struct inet_protosw *p) |
| { |
| if (INET_PROTOSW_PERMANENT & p->flags) { |
| printk(KERN_ERR |
| "Attempt to unregister permanent protocol %d.\n", |
| p->protocol); |
| } else { |
| spin_lock_bh(&inetsw_lock); |
| list_del_rcu(&p->list); |
| spin_unlock_bh(&inetsw_lock); |
| |
| synchronize_net(); |
| } |
| } |
| EXPORT_SYMBOL(inet_unregister_protosw); |
| |
| /* |
| * Shall we try to damage output packets if routing dev changes? |
| */ |
| |
| int sysctl_ip_dynaddr __read_mostly; |
| |
| static int inet_sk_reselect_saddr(struct sock *sk) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| __be32 old_saddr = inet->inet_saddr; |
| __be32 daddr = inet->inet_daddr; |
| struct flowi4 *fl4; |
| struct rtable *rt; |
| __be32 new_saddr; |
| struct ip_options_rcu *inet_opt; |
| |
| inet_opt = rcu_dereference_protected(inet->inet_opt, |
| sock_owned_by_user(sk)); |
| if (inet_opt && inet_opt->opt.srr) |
| daddr = inet_opt->opt.faddr; |
| |
| /* Query new route. */ |
| fl4 = &inet->cork.fl.u.ip4; |
| rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk), |
| sk->sk_bound_dev_if, sk->sk_protocol, |
| inet->inet_sport, inet->inet_dport, sk, false); |
| if (IS_ERR(rt)) |
| return PTR_ERR(rt); |
| |
| sk_setup_caps(sk, &rt->dst); |
| |
| new_saddr = fl4->saddr; |
| |
| if (new_saddr == old_saddr) |
| return 0; |
| |
| if (sysctl_ip_dynaddr > 1) { |
| printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n", |
| __func__, &old_saddr, &new_saddr); |
| } |
| |
| inet->inet_saddr = inet->inet_rcv_saddr = new_saddr; |
| |
| /* |
| * XXX The only one ugly spot where we need to |
| * XXX really change the sockets identity after |
| * XXX it has entered the hashes. -DaveM |
| * |
| * Besides that, it does not check for connection |
| * uniqueness. Wait for troubles. |
| */ |
| __sk_prot_rehash(sk); |
| return 0; |
| } |
| |
| int inet_sk_rebuild_header(struct sock *sk) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0); |
| __be32 daddr; |
| struct ip_options_rcu *inet_opt; |
| struct flowi4 *fl4; |
| int err; |
| |
| /* Route is OK, nothing to do. */ |
| if (rt) |
| return 0; |
| |
| /* Reroute. */ |
| rcu_read_lock(); |
| inet_opt = rcu_dereference(inet->inet_opt); |
| daddr = inet->inet_daddr; |
| if (inet_opt && inet_opt->opt.srr) |
| daddr = inet_opt->opt.faddr; |
| rcu_read_unlock(); |
| fl4 = &inet->cork.fl.u.ip4; |
| rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr, |
| inet->inet_dport, inet->inet_sport, |
| sk->sk_protocol, RT_CONN_FLAGS(sk), |
| sk->sk_bound_dev_if); |
| if (!IS_ERR(rt)) { |
| err = 0; |
| sk_setup_caps(sk, &rt->dst); |
| } else { |
| err = PTR_ERR(rt); |
| |
| /* Routing failed... */ |
| sk->sk_route_caps = 0; |
| /* |
| * Other protocols have to map its equivalent state to TCP_SYN_SENT. |
| * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme |
| */ |
| if (!sysctl_ip_dynaddr || |
| sk->sk_state != TCP_SYN_SENT || |
| (sk->sk_userlocks & SOCK_BINDADDR_LOCK) || |
| (err = inet_sk_reselect_saddr(sk)) != 0) |
| sk->sk_err_soft = -err; |
| } |
| |
| return err; |
| } |
| EXPORT_SYMBOL(inet_sk_rebuild_header); |
| |
| static int inet_gso_send_check(struct sk_buff *skb) |
| { |
| const struct iphdr *iph; |
| const struct net_protocol *ops; |
| int proto; |
| int ihl; |
| int err = -EINVAL; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) |
| goto out; |
| |
| iph = ip_hdr(skb); |
| ihl = iph->ihl * 4; |
| if (ihl < sizeof(*iph)) |
| goto out; |
| |
| if (unlikely(!pskb_may_pull(skb, ihl))) |
| goto out; |
| |
| __skb_pull(skb, ihl); |
| skb_reset_transport_header(skb); |
| iph = ip_hdr(skb); |
| proto = iph->protocol & (MAX_INET_PROTOS - 1); |
| err = -EPROTONOSUPPORT; |
| |
| rcu_read_lock(); |
| ops = rcu_dereference(inet_protos[proto]); |
| if (likely(ops && ops->gso_send_check)) |
| err = ops->gso_send_check(skb); |
| rcu_read_unlock(); |
| |
| out: |
| return err; |
| } |
| |
| static struct sk_buff *inet_gso_segment(struct sk_buff *skb, u32 features) |
| { |
| struct sk_buff *segs = ERR_PTR(-EINVAL); |
| struct iphdr *iph; |
| const struct net_protocol *ops; |
| int proto; |
| int ihl; |
| int id; |
| unsigned int offset = 0; |
| |
| if (!(features & NETIF_F_V4_CSUM)) |
| features &= ~NETIF_F_SG; |
| |
| if (unlikely(skb_shinfo(skb)->gso_type & |
| ~(SKB_GSO_TCPV4 | |
| SKB_GSO_UDP | |
| SKB_GSO_DODGY | |
| SKB_GSO_TCP_ECN | |
| 0))) |
| goto out; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) |
| goto out; |
| |
| iph = ip_hdr(skb); |
| ihl = iph->ihl * 4; |
| if (ihl < sizeof(*iph)) |
| goto out; |
| |
| if (unlikely(!pskb_may_pull(skb, ihl))) |
| goto out; |
| |
| __skb_pull(skb, ihl); |
| skb_reset_transport_header(skb); |
| iph = ip_hdr(skb); |
| id = ntohs(iph->id); |
| proto = iph->protocol & (MAX_INET_PROTOS - 1); |
| segs = ERR_PTR(-EPROTONOSUPPORT); |
| |
| rcu_read_lock(); |
| ops = rcu_dereference(inet_protos[proto]); |
| if (likely(ops && ops->gso_segment)) |
| segs = ops->gso_segment(skb, features); |
| rcu_read_unlock(); |
| |
| if (!segs || IS_ERR(segs)) |
| goto out; |
| |
| skb = segs; |
| do { |
| iph = ip_hdr(skb); |
| if (proto == IPPROTO_UDP) { |
| iph->id = htons(id); |
| iph->frag_off = htons(offset >> 3); |
| if (skb->next != NULL) |
| iph->frag_off |= htons(IP_MF); |
| offset += (skb->len - skb->mac_len - iph->ihl * 4); |
| } else |
| iph->id = htons(id++); |
| iph->tot_len = htons(skb->len - skb->mac_len); |
| iph->check = 0; |
| iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl); |
| } while ((skb = skb->next)); |
| |
| out: |
| return segs; |
| } |
| |
| static struct sk_buff **inet_gro_receive(struct sk_buff **head, |
| struct sk_buff *skb) |
| { |
| const struct net_protocol *ops; |
| struct sk_buff **pp = NULL; |
| struct sk_buff *p; |
| const struct iphdr *iph; |
| unsigned int hlen; |
| unsigned int off; |
| unsigned int id; |
| int flush = 1; |
| int proto; |
| |
| off = skb_gro_offset(skb); |
| hlen = off + sizeof(*iph); |
| iph = skb_gro_header_fast(skb, off); |
| if (skb_gro_header_hard(skb, hlen)) { |
| iph = skb_gro_header_slow(skb, hlen, off); |
| if (unlikely(!iph)) |
| goto out; |
| } |
| |
| proto = iph->protocol & (MAX_INET_PROTOS - 1); |
| |
| rcu_read_lock(); |
| ops = rcu_dereference(inet_protos[proto]); |
| if (!ops || !ops->gro_receive) |
| goto out_unlock; |
| |
| if (*(u8 *)iph != 0x45) |
| goto out_unlock; |
| |
| if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) |
| goto out_unlock; |
| |
| id = ntohl(*(__be32 *)&iph->id); |
| flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF)); |
| id >>= 16; |
| |
| for (p = *head; p; p = p->next) { |
| struct iphdr *iph2; |
| |
| if (!NAPI_GRO_CB(p)->same_flow) |
| continue; |
| |
| iph2 = ip_hdr(p); |
| |
| if ((iph->protocol ^ iph2->protocol) | |
| (iph->tos ^ iph2->tos) | |
| ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) | |
| ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) { |
| NAPI_GRO_CB(p)->same_flow = 0; |
| continue; |
| } |
| |
| /* All fields must match except length and checksum. */ |
| NAPI_GRO_CB(p)->flush |= |
| (iph->ttl ^ iph2->ttl) | |
| ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id); |
| |
| NAPI_GRO_CB(p)->flush |= flush; |
| } |
| |
| NAPI_GRO_CB(skb)->flush |= flush; |
| skb_gro_pull(skb, sizeof(*iph)); |
| skb_set_transport_header(skb, skb_gro_offset(skb)); |
| |
| pp = ops->gro_receive(head, skb); |
| |
| out_unlock: |
| rcu_read_unlock(); |
| |
| out: |
| NAPI_GRO_CB(skb)->flush |= flush; |
| |
| return pp; |
| } |
| |
| static int inet_gro_complete(struct sk_buff *skb) |
| { |
| const struct net_protocol *ops; |
| struct iphdr *iph = ip_hdr(skb); |
| int proto = iph->protocol & (MAX_INET_PROTOS - 1); |
| int err = -ENOSYS; |
| __be16 newlen = htons(skb->len - skb_network_offset(skb)); |
| |
| csum_replace2(&iph->check, iph->tot_len, newlen); |
| iph->tot_len = newlen; |
| |
| rcu_read_lock(); |
| ops = rcu_dereference(inet_protos[proto]); |
| if (WARN_ON(!ops || !ops->gro_complete)) |
| goto out_unlock; |
| |
| err = ops->gro_complete(skb); |
| |
| out_unlock: |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| int inet_ctl_sock_create(struct sock **sk, unsigned short family, |
| unsigned short type, unsigned char protocol, |
| struct net *net) |
| { |
| struct socket *sock; |
| int rc = sock_create_kern(family, type, protocol, &sock); |
| |
| if (rc == 0) { |
| *sk = sock->sk; |
| (*sk)->sk_allocation = GFP_ATOMIC; |
| /* |
| * Unhash it so that IP input processing does not even see it, |
| * we do not wish this socket to see incoming packets. |
| */ |
| (*sk)->sk_prot->unhash(*sk); |
| |
| sk_change_net(*sk, net); |
| } |
| return rc; |
| } |
| EXPORT_SYMBOL_GPL(inet_ctl_sock_create); |
| |
| unsigned long snmp_fold_field(void __percpu *mib[], int offt) |
| { |
| unsigned long res = 0; |
| int i, j; |
| |
| for_each_possible_cpu(i) { |
| for (j = 0; j < SNMP_ARRAY_SZ; j++) |
| res += *(((unsigned long *) per_cpu_ptr(mib[j], i)) + offt); |
| } |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(snmp_fold_field); |
| |
| #if BITS_PER_LONG==32 |
| |
| u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset) |
| { |
| u64 res = 0; |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| void *bhptr; |
| struct u64_stats_sync *syncp; |
| u64 v; |
| unsigned int start; |
| |
| bhptr = per_cpu_ptr(mib[0], cpu); |
| syncp = (struct u64_stats_sync *)(bhptr + syncp_offset); |
| do { |
| start = u64_stats_fetch_begin_bh(syncp); |
| v = *(((u64 *) bhptr) + offt); |
| } while (u64_stats_fetch_retry_bh(syncp, start)); |
| |
| res += v; |
| } |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(snmp_fold_field64); |
| #endif |
| |
| int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align) |
| { |
| BUG_ON(ptr == NULL); |
| ptr[0] = __alloc_percpu(mibsize, align); |
| if (!ptr[0]) |
| return -ENOMEM; |
| #if SNMP_ARRAY_SZ == 2 |
| ptr[1] = __alloc_percpu(mibsize, align); |
| if (!ptr[1]) { |
| free_percpu(ptr[0]); |
| ptr[0] = NULL; |
| return -ENOMEM; |
| } |
| #endif |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snmp_mib_init); |
| |
| void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) |
| { |
| int i; |
| |
| BUG_ON(ptr == NULL); |
| for (i = 0; i < SNMP_ARRAY_SZ; i++) { |
| free_percpu(ptr[i]); |
| ptr[i] = NULL; |
| } |
| } |
| EXPORT_SYMBOL_GPL(snmp_mib_free); |
| |
| #ifdef CONFIG_IP_MULTICAST |
| static const struct net_protocol igmp_protocol = { |
| .handler = igmp_rcv, |
| .netns_ok = 1, |
| }; |
| #endif |
| |
| static const struct net_protocol tcp_protocol = { |
| .handler = tcp_v4_rcv, |
| .err_handler = tcp_v4_err, |
| .gso_send_check = tcp_v4_gso_send_check, |
| .gso_segment = tcp_tso_segment, |
| .gro_receive = tcp4_gro_receive, |
| .gro_complete = tcp4_gro_complete, |
| .no_policy = 1, |
| .netns_ok = 1, |
| }; |
| |
| static const struct net_protocol udp_protocol = { |
| .handler = udp_rcv, |
| .err_handler = udp_err, |
| .gso_send_check = udp4_ufo_send_check, |
| .gso_segment = udp4_ufo_fragment, |
| .no_policy = 1, |
| .netns_ok = 1, |
| }; |
| |
| static const struct net_protocol icmp_protocol = { |
| .handler = icmp_rcv, |
| .err_handler = ping_err, |
| .no_policy = 1, |
| .netns_ok = 1, |
| }; |
| |
| static __net_init int ipv4_mib_init_net(struct net *net) |
| { |
| if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics, |
| sizeof(struct tcp_mib), |
| __alignof__(struct tcp_mib)) < 0) |
| goto err_tcp_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.ip_statistics, |
| sizeof(struct ipstats_mib), |
| __alignof__(struct ipstats_mib)) < 0) |
| goto err_ip_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.net_statistics, |
| sizeof(struct linux_mib), |
| __alignof__(struct linux_mib)) < 0) |
| goto err_net_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.udp_statistics, |
| sizeof(struct udp_mib), |
| __alignof__(struct udp_mib)) < 0) |
| goto err_udp_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics, |
| sizeof(struct udp_mib), |
| __alignof__(struct udp_mib)) < 0) |
| goto err_udplite_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics, |
| sizeof(struct icmp_mib), |
| __alignof__(struct icmp_mib)) < 0) |
| goto err_icmp_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics, |
| sizeof(struct icmpmsg_mib), |
| __alignof__(struct icmpmsg_mib)) < 0) |
| goto err_icmpmsg_mib; |
| |
| tcp_mib_init(net); |
| return 0; |
| |
| err_icmpmsg_mib: |
| snmp_mib_free((void __percpu **)net->mib.icmp_statistics); |
| err_icmp_mib: |
| snmp_mib_free((void __percpu **)net->mib.udplite_statistics); |
| err_udplite_mib: |
| snmp_mib_free((void __percpu **)net->mib.udp_statistics); |
| err_udp_mib: |
| snmp_mib_free((void __percpu **)net->mib.net_statistics); |
| err_net_mib: |
| snmp_mib_free((void __percpu **)net->mib.ip_statistics); |
| err_ip_mib: |
| snmp_mib_free((void __percpu **)net->mib.tcp_statistics); |
| err_tcp_mib: |
| return -ENOMEM; |
| } |
| |
| static __net_exit void ipv4_mib_exit_net(struct net *net) |
| { |
| snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics); |
| snmp_mib_free((void __percpu **)net->mib.icmp_statistics); |
| snmp_mib_free((void __percpu **)net->mib.udplite_statistics); |
| snmp_mib_free((void __percpu **)net->mib.udp_statistics); |
| snmp_mib_free((void __percpu **)net->mib.net_statistics); |
| snmp_mib_free((void __percpu **)net->mib.ip_statistics); |
| snmp_mib_free((void __percpu **)net->mib.tcp_statistics); |
| } |
| |
| static __net_initdata struct pernet_operations ipv4_mib_ops = { |
| .init = ipv4_mib_init_net, |
| .exit = ipv4_mib_exit_net, |
| }; |
| |
| static int __init init_ipv4_mibs(void) |
| { |
| return register_pernet_subsys(&ipv4_mib_ops); |
| } |
| |
| static int ipv4_proc_init(void); |
| |
| /* |
| * IP protocol layer initialiser |
| */ |
| |
| static struct packet_type ip_packet_type __read_mostly = { |
| .type = cpu_to_be16(ETH_P_IP), |
| .func = ip_rcv, |
| .gso_send_check = inet_gso_send_check, |
| .gso_segment = inet_gso_segment, |
| .gro_receive = inet_gro_receive, |
| .gro_complete = inet_gro_complete, |
| }; |
| |
| static int __init inet_init(void) |
| { |
| struct sk_buff *dummy_skb; |
| struct inet_protosw *q; |
| struct list_head *r; |
| int rc = -EINVAL; |
| |
| BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)); |
| |
| sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); |
| if (!sysctl_local_reserved_ports) |
| goto out; |
| |
| rc = proto_register(&tcp_prot, 1); |
| if (rc) |
| goto out_free_reserved_ports; |
| |
| rc = proto_register(&udp_prot, 1); |
| if (rc) |
| goto out_unregister_tcp_proto; |
| |
| rc = proto_register(&raw_prot, 1); |
| if (rc) |
| goto out_unregister_udp_proto; |
| |
| rc = proto_register(&ping_prot, 1); |
| if (rc) |
| goto out_unregister_raw_proto; |
| |
| /* |
| * Tell SOCKET that we are alive... |
| */ |
| |
| (void)sock_register(&inet_family_ops); |
| |
| #ifdef CONFIG_SYSCTL |
| ip_static_sysctl_init(); |
| #endif |
| |
| /* |
| * Add all the base protocols. |
| */ |
| |
| if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0) |
| printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n"); |
| if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0) |
| printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n"); |
| if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0) |
| printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n"); |
| #ifdef CONFIG_IP_MULTICAST |
| if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0) |
| printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n"); |
| #endif |
| |
| /* Register the socket-side information for inet_create. */ |
| for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r) |
| INIT_LIST_HEAD(r); |
| |
| for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q) |
| inet_register_protosw(q); |
| |
| /* |
| * Set the ARP module up |
| */ |
| |
| arp_init(); |
| |
| /* |
| * Set the IP module up |
| */ |
| |
| ip_init(); |
| |
| tcp_v4_init(); |
| |
| /* Setup TCP slab cache for open requests. */ |
| tcp_init(); |
| |
| /* Setup UDP memory threshold */ |
| udp_init(); |
| |
| /* Add UDP-Lite (RFC 3828) */ |
| udplite4_register(); |
| |
| ping_init(); |
| |
| /* |
| * Set the ICMP layer up |
| */ |
| |
| if (icmp_init() < 0) |
| panic("Failed to create the ICMP control socket.\n"); |
| |
| /* |
| * Initialise the multicast router |
| */ |
| #if defined(CONFIG_IP_MROUTE) |
| if (ip_mr_init()) |
| printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n"); |
| #endif |
| /* |
| * Initialise per-cpu ipv4 mibs |
| */ |
| |
| if (init_ipv4_mibs()) |
| printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n"); |
| |
| ipv4_proc_init(); |
| |
| ipfrag_init(); |
| |
| dev_add_pack(&ip_packet_type); |
| |
| rc = 0; |
| out: |
| return rc; |
| out_unregister_raw_proto: |
| proto_unregister(&raw_prot); |
| out_unregister_udp_proto: |
| proto_unregister(&udp_prot); |
| out_unregister_tcp_proto: |
| proto_unregister(&tcp_prot); |
| out_free_reserved_ports: |
| kfree(sysctl_local_reserved_ports); |
| goto out; |
| } |
| |
| fs_initcall(inet_init); |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| #ifdef CONFIG_PROC_FS |
| static int __init ipv4_proc_init(void) |
| { |
| int rc = 0; |
| |
| if (raw_proc_init()) |
| goto out_raw; |
| if (tcp4_proc_init()) |
| goto out_tcp; |
| if (udp4_proc_init()) |
| goto out_udp; |
| if (ping_proc_init()) |
| goto out_ping; |
| if (ip_misc_proc_init()) |
| goto out_misc; |
| out: |
| return rc; |
| out_misc: |
| ping_proc_exit(); |
| out_ping: |
| udp4_proc_exit(); |
| out_udp: |
| tcp4_proc_exit(); |
| out_tcp: |
| raw_proc_exit(); |
| out_raw: |
| rc = -ENOMEM; |
| goto out; |
| } |
| |
| #else /* CONFIG_PROC_FS */ |
| static int __init ipv4_proc_init(void) |
| { |
| return 0; |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| MODULE_ALIAS_NETPROTO(PF_INET); |
| |