/* * 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. * * Version: $Id: af_inet.c,v 1.137 2002/02/01 22:01:03 davem Exp $ * * Authors: Ross Biro, * Fred N. van Kempen, * Florian La Roche, * Alan Cox, * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_IP_MROUTE #include #endif #include #ifdef CONFIG_KMOD #include #endif #ifdef CONFIG_NET_DIVERT #include #endif /* CONFIG_NET_DIVERT */ #if defined(CONFIG_NET_RADIO) || defined(CONFIG_NET_PCMCIA_RADIO) #include /* Note : will define WIRELESS_EXT */ #endif /* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */ struct linux_mib net_statistics[NR_CPUS * 2]; #ifdef INET_REFCNT_DEBUG atomic_t inet_sock_nr; #endif extern int raw_get_info(char *, char **, off_t, int); extern int snmp_get_info(char *, char **, off_t, int); extern int netstat_get_info(char *, char **, off_t, int); extern int afinet_get_info(char *, char **, off_t, int); extern int tcp_get_info(char *, char **, off_t, int); extern int udp_get_info(char *, char **, off_t, int); extern void ip_mc_drop_socket(struct sock *sk); #ifdef CONFIG_DLCI extern int dlci_ioctl(unsigned int, void *); #endif #ifdef CONFIG_DLCI_MODULE int (*dlci_ioctl_hook)(unsigned int, void *); #endif #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) int (*br_ioctl_hook)(unsigned long); #endif #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) int (*vlan_ioctl_hook)(unsigned long arg); #endif /* Per protocol sock slabcache */ kmem_cache_t *tcp_sk_cachep; static kmem_cache_t *udp_sk_cachep; static kmem_cache_t *raw4_sk_cachep; /* The inetsw table contains everything that inet_create needs to * build a new socket. */ struct list_head inetsw[SOCK_MAX]; /* New destruction routine */ void inet_sock_destruct(struct sock *sk) { struct inet_opt *inet = inet_sk(sk); __skb_queue_purge(&sk->receive_queue); __skb_queue_purge(&sk->error_queue); if (sk->type == SOCK_STREAM && sk->state != TCP_CLOSE) { printk("Attempt to release TCP socket in state %d %p\n", sk->state, sk); return; } if (!sk->dead) { printk("Attempt to release alive inet socket %p\n", sk); return; } BUG_TRAP(!atomic_read(&sk->rmem_alloc)); BUG_TRAP(!atomic_read(&sk->wmem_alloc)); BUG_TRAP(!sk->wmem_queued); BUG_TRAP(!sk->forward_alloc); if (inet->opt) kfree(inet->opt); dst_release(sk->dst_cache); #ifdef INET_REFCNT_DEBUG atomic_dec(&inet_sock_nr); printk(KERN_DEBUG "INET socket %p released, %d are still alive\n", sk, atomic_read(&inet_sock_nr)); #endif } void inet_sock_release(struct sock *sk) { if (sk->prot->destroy) sk->prot->destroy(sk); /* Observation: when inet_sock_release is called, processes have * no access to socket. But net still has. * Step one, detach it from networking: * * A. Remove from hash tables. */ sk->prot->unhash(sk); /* In this point socket cannot receive new packets, * but it is possible that some packets are in flight * because some CPU runs receiver and did hash table lookup * before we unhashed socket. They will achieve receive queue * and will be purged by socket destructor. * * Also we still have packets pending on receive * queue and probably, our own packets waiting in device queues. * sock_destroy will drain receive queue, but transmitted * packets will delay socket destruction until the last reference * will be released. */ sock_orphan(sk); #ifdef INET_REFCNT_DEBUG if (atomic_read(&sk->refcnt) != 1) printk(KERN_DEBUG "Destruction inet %p delayed, c=%d\n", sk, atomic_read(&sk->refcnt)); #endif sock_put(sk); } /* * 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. */ /* * Set socket options on an inet socket. */ int inet_setsockopt(struct socket *sock, int level, int optname, char *optval, int optlen) { struct sock *sk = sock->sk; return sk->prot->setsockopt(sk, level, optname, optval, optlen); } /* * Get a socket option on an AF_INET socket. * * FIX: POSIX 1003.1g is very ambiguous here. It states that * asynchronous errors should be reported by getsockopt. We assume * this means if you specify SO_ERROR (otherwise whats the point of it). */ int inet_getsockopt(struct socket *sock, int level, int optname, char *optval, int *optlen) { struct sock *sk = sock->sk; return sk->prot->getsockopt(sk, level, optname, optval, optlen); } /* * Automatically bind an unbound socket. */ static int inet_autobind(struct sock *sk) { struct inet_opt *inet; /* We may need to bind the socket. */ lock_sock(sk); inet = inet_sk(sk); if (!inet->num) { if (sk->prot->get_port(sk, 0)) { release_sock(sk); return -EAGAIN; } inet->sport = htons(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->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 = tcp_listen_start(sk); if (err) goto out; } sk->max_ack_backlog = backlog; err = 0; out: release_sock(sk); return err; } static __inline__ kmem_cache_t *inet_sk_slab(int protocol) { kmem_cache_t* rc = tcp_sk_cachep; if (protocol == IPPROTO_UDP) rc = udp_sk_cachep; else if (protocol == IPPROTO_RAW) rc = raw4_sk_cachep; return rc; } static __inline__ int inet_sk_size(int protocol) { int rc = sizeof(struct tcp_sock); if (protocol == IPPROTO_UDP) rc = sizeof(struct udp_sock); else if (protocol == IPPROTO_RAW) rc = sizeof(struct raw_sock); return rc; } /* * Create an inet socket. */ static int inet_create(struct socket *sock, int protocol) { struct sock *sk; struct list_head *p; struct inet_protosw *answer; struct inet_opt *inet; int err = -ENOBUFS; sock->state = SS_UNCONNECTED; sk = sk_alloc(PF_INET, GFP_KERNEL, inet_sk_size(protocol), inet_sk_slab(protocol)); if (!sk) goto out; /* Look for the requested type/protocol pair. */ answer = NULL; br_read_lock_bh(BR_NETPROTO_LOCK); list_for_each(p, &inetsw[sock->type]) { answer = list_entry(p, struct inet_protosw, list); /* 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; } answer = NULL; } br_read_unlock_bh(BR_NETPROTO_LOCK); err = -ESOCKTNOSUPPORT; if (!answer) goto out_sk_free; err = -EPERM; if (answer->capability > 0 && !capable(answer->capability)) goto out_sk_free; err = -EPROTONOSUPPORT; if (!protocol) goto out_sk_free; err = 0; sock->ops = answer->ops; sk->prot = answer->prot; sk->no_check = answer->no_check; if (INET_PROTOSW_REUSE & answer->flags) sk->reuse = 1; inet = inet_sk(sk); if (SOCK_RAW == sock->type) { 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->id = 0; sock_init_data(sock, sk); sk->destruct = inet_sock_destruct; sk->zapped = 0; sk->family = PF_INET; sk->protocol = protocol; sk->backlog_rcv = sk->prot->backlog_rcv; inet->ttl = sysctl_ip_default_ttl; inet->mc_loop = 1; inet->mc_ttl = 1; inet->mc_index = 0; inet->mc_list = NULL; #ifdef INET_REFCNT_DEBUG atomic_inc(&inet_sock_nr); #endif if (inet->num) { /* It assumes that any protocol which allows * the user to assign a number at socket * creation time automatically * shares. */ inet->sport = htons(inet->num); /* Add to protocol hash chains. */ sk->prot->hash(sk); } if (sk->prot->init) { err = sk->prot->init(sk); if (err) inet_sock_release(sk); } out: return err; out_sk_free: sk_free(sk); 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; /* 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 (sk->linger && !(current->flags & PF_EXITING)) timeout = sk->lingertime; sock->sk = NULL; sk->prot->close(sk, timeout); } return 0; } /* It is off by default, see below. */ int sysctl_ip_nonlocal_bind; static 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_opt *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->prot->bind) { err = sk->prot->bind(sk, uaddr, addr_len); goto out; } err = -EINVAL; if (addr_len < sizeof(struct sockaddr_in)) goto out; chk_addr_ret = inet_addr_type(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 && addr->sin_addr.s_addr != 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->state != TCP_CLOSE || inet->num) goto out_release_sock; inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr; if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) inet->saddr = 0; /* Use device */ /* Make sure we are allowed to bind here. */ if (sk->prot->get_port(sk, snum)) { inet->saddr = inet->rcv_saddr = 0; err = -EADDRINUSE; goto out_release_sock; } if (inet->rcv_saddr) sk->userlocks |= SOCK_BINDADDR_LOCK; if (snum) sk->userlocks |= SOCK_BINDPORT_LOCK; inet->sport = htons(inet->num); inet->daddr = 0; inet->dport = 0; sk_dst_reset(sk); err = 0; out_release_sock: release_sock(sk); out: return err; } int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr, int addr_len, int flags) { struct sock *sk = sock->sk; if (uaddr->sa_family == AF_UNSPEC) return sk->prot->disconnect(sk, flags); if (!inet_sk(sk)->num && inet_autobind(sk)) return -EAGAIN; return sk->prot->connect(sk, (struct sockaddr *)uaddr, addr_len); } static long inet_wait_for_connect(struct sock *sk, long timeo) { DECLARE_WAITQUEUE(wait, current); __set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(sk->sleep, &wait); /* Basic assumption: if someone sets 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->state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) { release_sock(sk); timeo = schedule_timeout(timeo); lock_sock(sk); if (signal_pending(current) || !timeo) break; set_current_state(TASK_INTERRUPTIBLE); } __set_current_state(TASK_RUNNING); remove_wait_queue(sk->sleep, &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; lock_sock(sk); if (uaddr->sa_family == AF_UNSPEC) { err = 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->state != TCP_CLOSE) goto out; err = 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->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->state == TCP_CLOSE) goto sock_error; /* 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->prot->disconnect(sk, flags)) sock->state = SS_DISCONNECTING; goto out; } /* * 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->prot->accept(sk1, flags, &err); if (!sk2) goto do_err; lock_sock(sk2); BUG_TRAP((1 << sk2->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; } /* * This does both peername and sockname. */ static int inet_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) { struct sock *sk = sock->sk; struct inet_opt *inet = inet_sk(sk); struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; sin->sin_family = AF_INET; if (peer) { if (!inet->dport || (((1 << sk->state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && peer == 1)) return -ENOTCONN; sin->sin_port = inet->dport; sin->sin_addr.s_addr = inet->daddr; } else { __u32 addr = inet->rcv_saddr; if (!addr) addr = inet->saddr; sin->sin_port = inet->sport; sin->sin_addr.s_addr = addr; } *uaddr_len = sizeof(*sin); return 0; } int inet_recvmsg(struct socket *sock, struct msghdr *msg, int size, int flags, struct scm_cookie *scm) { struct sock *sk = sock->sk; int addr_len = 0; int err = sk->prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, flags & ~MSG_DONTWAIT, &addr_len); if (err >= 0) msg->msg_namelen = addr_len; return err; } int inet_sendmsg(struct socket *sock, struct msghdr *msg, int size, struct scm_cookie *scm) { struct sock *sk = sock->sk; /* We may need to bind the socket. */ if (!inet_sk(sk)->num && inet_autobind(sk)) return -EAGAIN; return sk->prot->sendmsg(sk, msg, size); } 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->state) & (TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE)) sock->state = SS_DISCONNECTING; else sock->state = SS_CONNECTED; } switch (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->shutdown |= how; if (sk->prot->shutdown) 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->prot->disconnect(sk, O_NONBLOCK); sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED; break; } /* Wake up anyone sleeping in poll. */ sk->state_change(sk); release_sock(sk); return err; } /* * 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. */ static int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) { struct sock *sk = sock->sk; int err = 0; int pid; switch (cmd) { case FIOSETOWN: case SIOCSPGRP: if (get_user(pid, (int *)arg)) err = -EFAULT; else if (current->pid != pid && current->pgrp != -pid && !capable(CAP_NET_ADMIN)) err = -EPERM; else sk->proc = pid; break; case FIOGETOWN: case SIOCGPGRP: err = put_user(sk->proc, (int *)arg); break; case SIOCGSTAMP: if (!sk->stamp.tv_sec) err = -ENOENT; else if (copy_to_user((void *)arg, &sk->stamp, sizeof(struct timeval))) err = -EFAULT; break; case SIOCADDRT: case SIOCDELRT: case SIOCRTMSG: err = ip_rt_ioctl(cmd, (void *)arg); break; case SIOCDARP: case SIOCGARP: case SIOCSARP: err = arp_ioctl(cmd, (void *)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(cmd, (void *)arg); break; case SIOCGIFBR: case SIOCSIFBR: #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) #ifdef CONFIG_KMOD if (!br_ioctl_hook) request_module("bridge"); #endif if (br_ioctl_hook) err = br_ioctl_hook(arg); else #endif err = -ENOPKG; break; case SIOCGIFVLAN: case SIOCSIFVLAN: #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) #ifdef CONFIG_KMOD if (!vlan_ioctl_hook) request_module("8021q"); #endif if (vlan_ioctl_hook) err = vlan_ioctl_hook(arg); else #endif err = -ENOPKG; break; case SIOCGIFDIVERT: case SIOCSIFDIVERT: #ifdef CONFIG_NET_DIVERT err = divert_ioctl(cmd, (struct divert_cf *)arg); #else err = -ENOPKG; #endif /* CONFIG_NET_DIVERT */ break; case SIOCADDDLCI: case SIOCDELDLCI: #ifdef CONFIG_DLCI lock_kernel(); err = dlci_ioctl(cmd, (void *)arg); unlock_kernel(); break; #elif CONFIG_DLCI_MODULE #ifdef CONFIG_KMOD if (!dlci_ioctl_hook) request_module("dlci"); #endif if (dlci_ioctl_hook) { lock_kernel(); err = (*dlci_ioctl_hook)(cmd, (void *)arg); unlock_kernel(); } else #endif err = -ENOPKG; break; default: if (cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) err = dev_ioctl(cmd, (void *)arg); else #ifdef WIRELESS_EXT if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) err = dev_ioctl(cmd, (void *)arg); else #endif /* WIRELESS_EXT */ if (!sk->prot->ioctl || (err = sk->prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD) err = dev_ioctl(cmd, (void *)arg); break; } return err; } struct proto_ops inet_stream_ops = { family: PF_INET, 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: inet_setsockopt, getsockopt: inet_getsockopt, sendmsg: inet_sendmsg, recvmsg: inet_recvmsg, mmap: sock_no_mmap, sendpage: tcp_sendpage }; struct proto_ops inet_dgram_ops = { family: PF_INET, 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: inet_setsockopt, getsockopt: inet_getsockopt, sendmsg: inet_sendmsg, recvmsg: inet_recvmsg, mmap: sock_no_mmap, sendpage: sock_no_sendpage, }; struct net_proto_family inet_family_ops = { family: PF_INET, create: inet_create, }; extern void tcp_init(void); extern void tcp_v4_init(struct net_proto_family *); /* 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, capability: -1, no_check: 0, flags: INET_PROTOSW_PERMANENT, }, { type: SOCK_DGRAM, protocol: IPPROTO_UDP, prot: &udp_prot, ops: &inet_dgram_ops, capability: -1, no_check: UDP_CSUM_DEFAULT, flags: INET_PROTOSW_PERMANENT, }, { type: SOCK_RAW, protocol: IPPROTO_IP, /* wild card */ prot: &raw_prot, ops: &inet_dgram_ops, capability: CAP_NET_RAW, no_check: UDP_CSUM_DEFAULT, flags: INET_PROTOSW_REUSE, } }; #define INETSW_ARRAY_LEN (sizeof(inetsw_array) / sizeof(struct inet_protosw)) void inet_register_protosw(struct inet_protosw *p) { struct list_head *lh; struct inet_protosw *answer; int protocol = p->protocol; br_write_lock_bh(BR_NETPROTO_LOCK); if (p->type > SOCK_MAX) goto out_illegal; /* If we are trying to override a permanent protocol, bail. */ answer = NULL; list_for_each(lh, &inetsw[p->type]) { answer = list_entry(lh, struct inet_protosw, list); /* Check only the non-wild match. */ if (protocol == answer->protocol && (INET_PROTOSW_PERMANENT & answer->flags)) break; answer = NULL; } if (answer) goto out_permanent; /* Add to the BEGINNING so that we override any existing * entry. This means that when we remove this entry, the * system automatically returns to the old behavior. */ list_add(&p->list, &inetsw[p->type]); out: br_write_unlock_bh(BR_NETPROTO_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 illegal socket type %d.\n", p->type); goto out; } 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 { br_write_lock_bh(BR_NETPROTO_LOCK); list_del(&p->list); br_write_unlock_bh(BR_NETPROTO_LOCK); } } /* * Called by socket.c on kernel startup. */ static int __init inet_init(void) { struct sk_buff *dummy_skb; struct inet_protocol *p; struct inet_protosw *q; struct list_head *r; printk(KERN_INFO "NET4: Linux TCP/IP 1.0 for NET4.0\n"); if (sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb)) { printk(KERN_CRIT "inet_proto_init: panic\n"); return -EINVAL; } tcp_sk_cachep = kmem_cache_create("tcp_sock", sizeof(struct tcp_sock), 0, SLAB_HWCACHE_ALIGN, 0, 0); udp_sk_cachep = kmem_cache_create("udp_sock", sizeof(struct udp_sock), 0, SLAB_HWCACHE_ALIGN, 0, 0); raw4_sk_cachep = kmem_cache_create("raw4_sock", sizeof(struct raw_sock), 0, SLAB_HWCACHE_ALIGN, 0, 0); if (!tcp_sk_cachep || !udp_sk_cachep || !raw4_sk_cachep) printk(KERN_CRIT "inet_init: Can't create protocol sock SLAB caches!\n"); /* * Tell SOCKET that we are alive... */ (void)sock_register(&inet_family_ops); /* * Add all the protocols. */ printk(KERN_INFO "IP Protocols: "); for (p = inet_protocol_base; p;) { struct inet_protocol *tmp = (struct inet_protocol *)p->next; inet_add_protocol(p); printk("%s%s", p->name, tmp ? ", " : "\n"); p = tmp; } /* 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(&inet_family_ops); /* Setup TCP slab cache for open requests. */ tcp_init(); /* * Set the ICMP layer up */ icmp_init(&inet_family_ops); /* I wish inet_add_protocol had no constructor hook... I had to move IPIP from net/ipv4/protocol.c :-( --ANK */ #ifdef CONFIG_NET_IPIP ipip_init(); #endif #ifdef CONFIG_NET_IPGRE ipgre_init(); #endif /* * Initialise the multicast router */ #if defined(CONFIG_IP_MROUTE) ip_mr_init(); #endif /* * Create all the /proc entries. */ #ifdef CONFIG_PROC_FS proc_net_create ("raw", 0, raw_get_info); proc_net_create ("netstat", 0, netstat_get_info); proc_net_create ("snmp", 0, snmp_get_info); proc_net_create ("sockstat", 0, afinet_get_info); proc_net_create ("tcp", 0, tcp_get_info); proc_net_create ("udp", 0, udp_get_info); #endif /* CONFIG_PROC_FS */ return 0; } module_init(inet_init);