af_inet6.c
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上传日期:2013-02-24
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- /*
- * PF_INET6 socket protocol family
- * Linux INET6 implementation
- *
- * Authors:
- * Pedro Roque <roque@di.fc.ul.pt>
- *
- * Adapted from linux/net/ipv4/af_inet.c
- *
- * $Id: af_inet6.c,v 1.65 2001/10/02 02:22:36 davem Exp $
- *
- * Fixes:
- * piggy, Karl Knutson : Socket protocol table
- * Hideaki YOSHIFUJI : sin6_scope_id support
- * Arnaldo Melo : check proc_net_create return, cleanups
- *
- * 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/module.h>
- #include <linux/config.h>
- #include <linux/errno.h>
- #include <linux/types.h>
- #include <linux/socket.h>
- #include <linux/in.h>
- #include <linux/kernel.h>
- #include <linux/major.h>
- #include <linux/sched.h>
- #include <linux/timer.h>
- #include <linux/string.h>
- #include <linux/sockios.h>
- #include <linux/net.h>
- #include <linux/fcntl.h>
- #include <linux/mm.h>
- #include <linux/interrupt.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include <linux/init.h>
- #include <linux/version.h>
- #include <linux/inet.h>
- #include <linux/netdevice.h>
- #include <linux/icmpv6.h>
- #include <linux/brlock.h>
- #include <linux/smp_lock.h>
- #include <net/ip.h>
- #include <net/ipv6.h>
- #include <net/udp.h>
- #include <net/tcp.h>
- #include <net/ipip.h>
- #include <net/protocol.h>
- #include <net/inet_common.h>
- #include <net/transp_v6.h>
- #include <net/ip6_route.h>
- #include <net/addrconf.h>
- #include <asm/uaccess.h>
- #include <asm/system.h>
- #ifdef MODULE
- static int unloadable = 0; /* XX: Turn to one when all is ok within the
- module for allowing unload */
- #endif
- #if defined(MODULE) && LINUX_VERSION_CODE > 0x20115
- MODULE_AUTHOR("Cast of dozens");
- MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
- MODULE_PARM(unloadable, "i");
- #endif
- /* IPv6 procfs goodies... */
- #ifdef CONFIG_PROC_FS
- extern int raw6_get_info(char *, char **, off_t, int);
- extern int tcp6_get_info(char *, char **, off_t, int);
- extern int udp6_get_info(char *, char **, off_t, int);
- extern int afinet6_get_info(char *, char **, off_t, int);
- extern int afinet6_get_snmp(char *, char **, off_t, int);
- #endif
- #ifdef CONFIG_SYSCTL
- extern void ipv6_sysctl_register(void);
- extern void ipv6_sysctl_unregister(void);
- #endif
- #ifdef INET_REFCNT_DEBUG
- atomic_t inet6_sock_nr;
- #endif
- /* The inetsw table contains everything that inet_create needs to
- * build a new socket.
- */
- struct list_head inetsw6[SOCK_MAX];
- static void inet6_sock_destruct(struct sock *sk)
- {
- inet_sock_destruct(sk);
- #ifdef INET_REFCNT_DEBUG
- atomic_dec(&inet6_sock_nr);
- #endif
- MOD_DEC_USE_COUNT;
- }
- static int inet6_create(struct socket *sock, int protocol)
- {
- struct sock *sk;
- struct list_head *p;
- struct inet_protosw *answer;
- sk = sk_alloc(PF_INET6, GFP_KERNEL, 1);
- if (sk == NULL)
- goto do_oom;
- /* Look for the requested type/protocol pair. */
- answer = NULL;
- br_read_lock_bh(BR_NETPROTO_LOCK);
- list_for_each(p, &inetsw6[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);
- if (!answer)
- goto free_and_badtype;
- if (answer->capability > 0 && !capable(answer->capability))
- goto free_and_badperm;
- if (!protocol)
- goto free_and_noproto;
- sock->ops = answer->ops;
- sock_init_data(sock, sk);
- sk->prot = answer->prot;
- sk->no_check = answer->no_check;
- if (INET_PROTOSW_REUSE & answer->flags)
- sk->reuse = 1;
- if (SOCK_RAW == sock->type) {
- sk->num = protocol;
- if (IPPROTO_RAW == protocol)
- sk->protinfo.af_inet.hdrincl = 1;
- }
- sk->destruct = inet6_sock_destruct;
- sk->zapped = 0;
- sk->family = PF_INET6;
- sk->protocol = protocol;
- sk->backlog_rcv = answer->prot->backlog_rcv;
- sk->net_pinfo.af_inet6.hop_limit = -1;
- sk->net_pinfo.af_inet6.mcast_hops = -1;
- sk->net_pinfo.af_inet6.mc_loop = 1;
- sk->net_pinfo.af_inet6.pmtudisc = IPV6_PMTUDISC_WANT;
- /* Init the ipv4 part of the socket since we can have sockets
- * using v6 API for ipv4.
- */
- sk->protinfo.af_inet.ttl = 64;
- sk->protinfo.af_inet.mc_loop = 1;
- sk->protinfo.af_inet.mc_ttl = 1;
- sk->protinfo.af_inet.mc_index = 0;
- sk->protinfo.af_inet.mc_list = NULL;
- if (ipv4_config.no_pmtu_disc)
- sk->protinfo.af_inet.pmtudisc = IP_PMTUDISC_DONT;
- else
- sk->protinfo.af_inet.pmtudisc = IP_PMTUDISC_WANT;
- #ifdef INET_REFCNT_DEBUG
- atomic_inc(&inet6_sock_nr);
- atomic_inc(&inet_sock_nr);
- #endif
- MOD_INC_USE_COUNT;
- if (sk->num) {
- /* It assumes that any protocol which allows
- * the user to assign a number at socket
- * creation time automatically shares.
- */
- sk->sport = ntohs(sk->num);
- sk->prot->hash(sk);
- }
- if (sk->prot->init) {
- int err = sk->prot->init(sk);
- if (err != 0) {
- MOD_DEC_USE_COUNT;
- inet_sock_release(sk);
- return err;
- }
- }
- return 0;
- free_and_badtype:
- sk_free(sk);
- return -ESOCKTNOSUPPORT;
- free_and_badperm:
- sk_free(sk);
- return -EPERM;
- free_and_noproto:
- sk_free(sk);
- return -EPROTONOSUPPORT;
- do_oom:
- return -ENOBUFS;
- }
- /* bind for INET6 API */
- static int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
- {
- struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
- struct sock *sk = sock->sk;
- __u32 v4addr = 0;
- unsigned short snum;
- int addr_type = 0;
- /* If the socket has its own bind function then use it. */
- if(sk->prot->bind)
- return sk->prot->bind(sk, uaddr, addr_len);
- if (addr_len < SIN6_LEN_RFC2133)
- return -EINVAL;
- addr_type = ipv6_addr_type(&addr->sin6_addr);
- if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
- return -EINVAL;
- /* Check if the address belongs to the host. */
- if (addr_type == IPV6_ADDR_MAPPED) {
- v4addr = addr->sin6_addr.s6_addr32[3];
- if (inet_addr_type(v4addr) != RTN_LOCAL)
- return -EADDRNOTAVAIL;
- } else {
- if (addr_type != IPV6_ADDR_ANY) {
- /* ipv4 addr of the socket is invalid. Only the
- * unpecified and mapped address have a v4 equivalent.
- */
- v4addr = LOOPBACK4_IPV6;
- if (!(addr_type & IPV6_ADDR_MULTICAST)) {
- if (!ipv6_chk_addr(&addr->sin6_addr, NULL))
- return -EADDRNOTAVAIL;
- }
- }
- }
- snum = ntohs(addr->sin6_port);
- if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
- return -EACCES;
- lock_sock(sk);
- /* Check these errors (active socket, double bind). */
- if ((sk->state != TCP_CLOSE) ||
- (sk->num != 0)) {
- release_sock(sk);
- return -EINVAL;
- }
- if (addr_type & IPV6_ADDR_LINKLOCAL) {
- if (addr_len >= sizeof(struct sockaddr_in6) &&
- addr->sin6_scope_id) {
- /* Override any existing binding, if another one
- * is supplied by user.
- */
- sk->bound_dev_if = addr->sin6_scope_id;
- }
- /* Binding to link-local address requires an interface */
- if (sk->bound_dev_if == 0) {
- release_sock(sk);
- return -EINVAL;
- }
- }
- sk->rcv_saddr = v4addr;
- sk->saddr = v4addr;
- ipv6_addr_copy(&sk->net_pinfo.af_inet6.rcv_saddr, &addr->sin6_addr);
-
- if (!(addr_type & IPV6_ADDR_MULTICAST))
- ipv6_addr_copy(&sk->net_pinfo.af_inet6.saddr, &addr->sin6_addr);
- /* Make sure we are allowed to bind here. */
- if (sk->prot->get_port(sk, snum) != 0) {
- sk->rcv_saddr = 0;
- sk->saddr = 0;
- memset(&sk->net_pinfo.af_inet6.rcv_saddr, 0, sizeof(struct in6_addr));
- memset(&sk->net_pinfo.af_inet6.saddr, 0, sizeof(struct in6_addr));
- release_sock(sk);
- return -EADDRINUSE;
- }
- if (addr_type != IPV6_ADDR_ANY)
- sk->userlocks |= SOCK_BINDADDR_LOCK;
- if (snum)
- sk->userlocks |= SOCK_BINDPORT_LOCK;
- sk->sport = ntohs(sk->num);
- sk->dport = 0;
- sk->daddr = 0;
- release_sock(sk);
- return 0;
- }
- static int inet6_release(struct socket *sock)
- {
- struct sock *sk = sock->sk;
- if (sk == NULL)
- return -EINVAL;
- /* Free mc lists */
- ipv6_sock_mc_close(sk);
- return inet_release(sock);
- }
- int inet6_destroy_sock(struct sock *sk)
- {
- struct sk_buff *skb;
- struct ipv6_txoptions *opt;
- /*
- * Release destination entry
- */
- sk_dst_reset(sk);
- /* Release rx options */
- if ((skb = xchg(&sk->net_pinfo.af_inet6.pktoptions, NULL)) != NULL)
- kfree_skb(skb);
- /* Free flowlabels */
- fl6_free_socklist(sk);
- /* Free tx options */
- if ((opt = xchg(&sk->net_pinfo.af_inet6.opt, NULL)) != NULL)
- sock_kfree_s(sk, opt, opt->tot_len);
- return 0;
- }
- /*
- * This does both peername and sockname.
- */
-
- static int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
- int *uaddr_len, int peer)
- {
- struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
- struct sock *sk = sock->sk;
-
- sin->sin6_family = AF_INET6;
- sin->sin6_flowinfo = 0;
- sin->sin6_scope_id = 0;
- if (peer) {
- if (!sk->dport)
- return -ENOTCONN;
- if (((1<<sk->state)&(TCPF_CLOSE|TCPF_SYN_SENT)) && peer == 1)
- return -ENOTCONN;
- sin->sin6_port = sk->dport;
- memcpy(&sin->sin6_addr, &sk->net_pinfo.af_inet6.daddr,
- sizeof(struct in6_addr));
- if (sk->net_pinfo.af_inet6.sndflow)
- sin->sin6_flowinfo = sk->net_pinfo.af_inet6.flow_label;
- } else {
- if (ipv6_addr_type(&sk->net_pinfo.af_inet6.rcv_saddr) == IPV6_ADDR_ANY)
- memcpy(&sin->sin6_addr,
- &sk->net_pinfo.af_inet6.saddr,
- sizeof(struct in6_addr));
- else
- memcpy(&sin->sin6_addr,
- &sk->net_pinfo.af_inet6.rcv_saddr,
- sizeof(struct in6_addr));
- sin->sin6_port = sk->sport;
- }
- if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
- sin->sin6_scope_id = sk->bound_dev_if;
- *uaddr_len = sizeof(*sin);
- return(0);
- }
- static int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
- {
- struct sock *sk = sock->sk;
- int err = -EINVAL;
- int pid;
- switch(cmd)
- {
- case FIOSETOWN:
- case SIOCSPGRP:
- if (get_user(pid, (int *) arg))
- return -EFAULT;
- /* see sock_no_fcntl */
- if (current->pid != pid && current->pgrp != -pid &&
- !capable(CAP_NET_ADMIN))
- return -EPERM;
- sk->proc = pid;
- return(0);
- case FIOGETOWN:
- case SIOCGPGRP:
- return put_user(sk->proc,(int *)arg);
- case SIOCGSTAMP:
- if(sk->stamp.tv_sec==0)
- return -ENOENT;
- err = copy_to_user((void *)arg, &sk->stamp,
- sizeof(struct timeval));
- if (err)
- return -EFAULT;
- return 0;
- case SIOCADDRT:
- case SIOCDELRT:
-
- return(ipv6_route_ioctl(cmd,(void *)arg));
- case SIOCSIFADDR:
- return addrconf_add_ifaddr((void *) arg);
- case SIOCDIFADDR:
- return addrconf_del_ifaddr((void *) arg);
- case SIOCSIFDSTADDR:
- return addrconf_set_dstaddr((void *) arg);
- default:
- if ((cmd >= SIOCDEVPRIVATE) &&
- (cmd <= (SIOCDEVPRIVATE + 15)))
- return(dev_ioctl(cmd,(void *) arg));
-
- if(sk->prot->ioctl==0 || (err=sk->prot->ioctl(sk, cmd, arg))==-ENOIOCTLCMD)
- return(dev_ioctl(cmd,(void *) arg));
- return err;
- }
- /*NOTREACHED*/
- return(0);
- }
- struct proto_ops inet6_stream_ops = {
- family: PF_INET6,
- release: inet6_release,
- bind: inet6_bind,
- connect: inet_stream_connect, /* ok */
- socketpair: sock_no_socketpair, /* a do nothing */
- accept: inet_accept, /* ok */
- getname: inet6_getname,
- poll: tcp_poll, /* ok */
- ioctl: inet6_ioctl, /* must change */
- listen: inet_listen, /* ok */
- shutdown: inet_shutdown, /* ok */
- setsockopt: inet_setsockopt, /* ok */
- getsockopt: inet_getsockopt, /* ok */
- sendmsg: inet_sendmsg, /* ok */
- recvmsg: inet_recvmsg, /* ok */
- mmap: sock_no_mmap,
- sendpage: tcp_sendpage
- };
- struct proto_ops inet6_dgram_ops = {
- family: PF_INET6,
- release: inet6_release,
- bind: inet6_bind,
- connect: inet_dgram_connect, /* ok */
- socketpair: sock_no_socketpair, /* a do nothing */
- accept: sock_no_accept, /* a do nothing */
- getname: inet6_getname,
- poll: datagram_poll, /* ok */
- ioctl: inet6_ioctl, /* must change */
- listen: sock_no_listen, /* ok */
- shutdown: inet_shutdown, /* ok */
- setsockopt: inet_setsockopt, /* ok */
- getsockopt: inet_getsockopt, /* ok */
- sendmsg: inet_sendmsg, /* ok */
- recvmsg: inet_recvmsg, /* ok */
- mmap: sock_no_mmap,
- sendpage: sock_no_sendpage,
- };
- struct net_proto_family inet6_family_ops = {
- PF_INET6,
- inet6_create
- };
- #ifdef MODULE
- int ipv6_unload(void)
- {
- if (!unloadable) return 1;
- /* We keep internally 3 raw sockets */
- return atomic_read(&(__this_module.uc.usecount)) - 3;
- }
- #endif
- #if defined(MODULE) && defined(CONFIG_SYSCTL)
- extern void ipv6_sysctl_register(void);
- extern void ipv6_sysctl_unregister(void);
- #endif
- static struct inet_protosw rawv6_protosw = {
- type: SOCK_RAW,
- protocol: IPPROTO_IP, /* wild card */
- prot: &rawv6_prot,
- ops: &inet6_dgram_ops,
- capability: CAP_NET_RAW,
- no_check: UDP_CSUM_DEFAULT,
- flags: INET_PROTOSW_REUSE,
- };
- #define INETSW6_ARRAY_LEN (sizeof(inetsw6_array) / sizeof(struct inet_protosw))
- void
- inet6_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, &inetsw6[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, &inetsw6[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
- inet6_unregister_protosw(struct inet_protosw *p)
- {
- inet_unregister_protosw(p);
- }
- static int __init inet6_init(void)
- {
- struct sk_buff *dummy_skb;
- struct list_head *r;
- int err;
- #ifdef MODULE
- if (!mod_member_present(&__this_module, can_unload))
- return -EINVAL;
- __this_module.can_unload = &ipv6_unload;
- #endif
- printk(KERN_INFO "IPv6 v0.8 for NET4.0n");
- if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb))
- {
- printk(KERN_CRIT "inet6_proto_init: size faultn");
- return -EINVAL;
- }
- /* Register the socket-side information for inet6_create. */
- for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
- INIT_LIST_HEAD(r);
- /* We MUST register RAW sockets before we create the ICMP6,
- * IGMP6, or NDISC control sockets.
- */
- inet6_register_protosw(&rawv6_protosw);
- /*
- * ipngwg API draft makes clear that the correct semantics
- * for TCP and UDP is to consider one TCP and UDP instance
- * in a host availiable by both INET and INET6 APIs and
- * able to communicate via both network protocols.
- */
- #if defined(MODULE) && defined(CONFIG_SYSCTL)
- ipv6_sysctl_register();
- #endif
- err = icmpv6_init(&inet6_family_ops);
- if (err)
- goto icmp_fail;
- err = ndisc_init(&inet6_family_ops);
- if (err)
- goto ndisc_fail;
- err = igmp6_init(&inet6_family_ops);
- if (err)
- goto igmp_fail;
- /* Create /proc/foo6 entries. */
- #ifdef CONFIG_PROC_FS
- err = -ENOMEM;
- if (!proc_net_create("raw6", 0, raw6_get_info))
- goto proc_raw6_fail;
- if (!proc_net_create("tcp6", 0, tcp6_get_info))
- goto proc_tcp6_fail;
- if (!proc_net_create("udp6", 0, udp6_get_info))
- goto proc_udp6_fail;
- if (!proc_net_create("sockstat6", 0, afinet6_get_info))
- goto proc_sockstat6_fail;
- if (!proc_net_create("snmp6", 0, afinet6_get_snmp))
- goto proc_snmp6_fail;
- #endif
- ipv6_netdev_notif_init();
- ipv6_packet_init();
- ip6_route_init();
- ip6_flowlabel_init();
- addrconf_init();
- sit_init();
- /* Init v6 transport protocols. */
- udpv6_init();
- tcpv6_init();
- /* Now the userspace is allowed to create INET6 sockets. */
- (void) sock_register(&inet6_family_ops);
-
- return 0;
- #ifdef CONFIG_PROC_FS
- proc_snmp6_fail:
- proc_net_remove("sockstat6");
- proc_sockstat6_fail:
- proc_net_remove("udp6");
- proc_udp6_fail:
- proc_net_remove("tcp6");
- proc_tcp6_fail:
- proc_net_remove("raw6");
- proc_raw6_fail:
- igmp6_cleanup();
- #endif
- igmp_fail:
- ndisc_cleanup();
- ndisc_fail:
- icmpv6_cleanup();
- icmp_fail:
- #if defined(MODULE) && defined(CONFIG_SYSCTL)
- ipv6_sysctl_unregister();
- #endif
- return err;
- }
- module_init(inet6_init);
- #ifdef MODULE
- static void inet6_exit(void)
- {
- /* First of all disallow new sockets creation. */
- sock_unregister(PF_INET6);
- #ifdef CONFIG_PROC_FS
- proc_net_remove("raw6");
- proc_net_remove("tcp6");
- proc_net_remove("udp6");
- proc_net_remove("sockstat6");
- proc_net_remove("snmp6");
- #endif
- /* Cleanup code parts. */
- sit_cleanup();
- ipv6_netdev_notif_cleanup();
- ip6_flowlabel_cleanup();
- addrconf_cleanup();
- ip6_route_cleanup();
- ipv6_packet_cleanup();
- igmp6_cleanup();
- ndisc_cleanup();
- icmpv6_cleanup();
- #ifdef CONFIG_SYSCTL
- ipv6_sysctl_unregister();
- #endif
- }
- module_exit(inet6_exit);
- #endif /* MODULE */
- MODULE_LICENSE("GPL");