diff options
Diffstat (limited to 'pfinet/linux-src/net/ipv6/af_inet6.c')
| -rw-r--r-- | pfinet/linux-src/net/ipv6/af_inet6.c | 610 |
1 files changed, 610 insertions, 0 deletions
diff --git a/pfinet/linux-src/net/ipv6/af_inet6.c b/pfinet/linux-src/net/ipv6/af_inet6.c new file mode 100644 index 00000000..4ad6403c --- /dev/null +++ b/pfinet/linux-src/net/ipv6/af_inet6.c @@ -0,0 +1,610 @@ +/* + * 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 1.1 2007/10/08 21:12:30 stesie Exp $ + * + * 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 <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 + +extern struct proto_ops inet6_stream_ops; +extern struct proto_ops inet6_dgram_ops; + +/* IPv6 procfs goodies... */ + +#ifdef CONFIG_PROC_FS +extern int raw6_get_info(char *, char **, off_t, int, int); +extern int tcp6_get_info(char *, char **, off_t, int, int); +extern int udp6_get_info(char *, char **, off_t, int, int); +extern int afinet6_get_info(char *, char **, off_t, int, int); +extern int afinet6_get_snmp(char *, char **, off_t, int, int); +#endif + +#ifdef CONFIG_SYSCTL +extern void ipv6_sysctl_register(void); +extern void ipv6_sysctl_unregister(void); +#endif + +static int inet6_create(struct socket *sock, int protocol) +{ + struct sock *sk; + struct proto *prot; + + sk = sk_alloc(PF_INET6, GFP_KERNEL, 1); + if (sk == NULL) + goto do_oom; + + if(sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET) { + if (protocol && protocol != IPPROTO_TCP) + goto free_and_noproto; + protocol = IPPROTO_TCP; + prot = &tcpv6_prot; + sock->ops = &inet6_stream_ops; + } else if(sock->type == SOCK_DGRAM) { + if (protocol && protocol != IPPROTO_UDP) + goto free_and_noproto; + protocol = IPPROTO_UDP; + sk->no_check = UDP_NO_CHECK; + prot=&udpv6_prot; + sock->ops = &inet6_dgram_ops; + } else if(sock->type == SOCK_RAW) { + if (!capable(CAP_NET_RAW)) + goto free_and_badperm; + if (!protocol) + goto free_and_noproto; + prot = &rawv6_prot; + sock->ops = &inet6_dgram_ops; + sk->reuse = 1; + sk->num = protocol; + } else { + goto free_and_badtype; + } + + sock_init_data(sock, sk); + + sk->destruct = NULL; + sk->zapped = 0; + sk->family = PF_INET6; + sk->protocol = protocol; + + sk->prot = prot; + sk->backlog_rcv = prot->backlog_rcv; + + sk->timer.data = (unsigned long)sk; + sk->timer.function = &net_timer; + + 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->ip_ttl = 64; + + sk->ip_mc_loop = 1; + sk->ip_mc_ttl = 1; + sk->ip_mc_index = 0; + sk->ip_mc_list = NULL; + + if (sk->type==SOCK_RAW && protocol==IPPROTO_RAW) + sk->ip_hdrincl=1; + + 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); + add_to_prot_sklist(sk); + } + + if (sk->prot->init) { + int err = sk->prot->init(sk); + if (err != 0) { + destroy_sock(sk); + return(err); + } + } + MOD_INC_USE_COUNT; + 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); + + /* Check these errors (active socket, bad address length, double bind). */ + if ((sk->state != TCP_CLOSE) || + (addr_len < sizeof(struct sockaddr_in6)) || + (sk->num != 0)) + 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, 0) == NULL) + return(-EADDRNOTAVAIL); + } + } + } + + sk->rcv_saddr = v4addr; + sk->saddr = v4addr; + + memcpy(&sk->net_pinfo.af_inet6.rcv_saddr, &addr->sin6_addr, + sizeof(struct in6_addr)); + + if (!(addr_type & IPV6_ADDR_MULTICAST)) + memcpy(&sk->net_pinfo.af_inet6.saddr, &addr->sin6_addr, + sizeof(struct in6_addr)); + + snum = ntohs(addr->sin6_port); + if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE)) + return(-EACCES); + + /* Make sure we are allowed to bind here. */ + if(sk->prot->get_port(sk, snum) != 0) + return -EADDRINUSE; + + sk->sport = ntohs(sk->num); + sk->dport = 0; + sk->daddr = 0; + sk->prot->hash(sk); + add_to_prot_sklist(sk); + + return(0); +} + +static int inet6_release(struct socket *sock, struct socket *peer) +{ + struct sock *sk = sock->sk; + + if (sk == NULL) + return -EINVAL; + + /* Free mc lists */ + ipv6_sock_mc_close(sk); + + /* Huh! MOD_DEC_USE_COUNT was here :-( + It is impossible by two reasons: socket destroy + may be delayed and inet_release may sleep and + return to nowhere then. It should be moved to + inet6_destroy_sock(), but we have no explicit constructor :-( + --ANK (980802) + */ + MOD_DEC_USE_COUNT; + return inet_release(sock, peer); +} + +int inet6_destroy_sock(struct sock *sk) +{ + struct sk_buff *skb; + struct ipv6_txoptions *opt; + + /* + * Release destination entry + */ + + dst_release(xchg(&sk->dst_cache,NULL)); + + /* 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; + + sin->sin6_family = AF_INET6; + sin->sin6_flowinfo = 0; + sk = sock->sk; + if (peer) { + if (!tcp_connected(sk->state)) + 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; + } + *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: + err = get_user(pid, (int *) arg); + if(err) + return err; + + /* 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: + err = put_user(sk->proc,(int *)arg); + if(err) + return err; + return(0); + 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 = { + PF_INET6, + + sock_no_dup, + inet6_release, + inet6_bind, + inet_stream_connect, /* ok */ + sock_no_socketpair, /* a do nothing */ + inet_accept, /* ok */ + inet6_getname, + inet_poll, /* ok */ + inet6_ioctl, /* must change */ + inet_listen, /* ok */ + inet_shutdown, /* ok */ + inet_setsockopt, /* ok */ + inet_getsockopt, /* ok */ + sock_no_fcntl, /* ok */ + inet_sendmsg, /* ok */ + inet_recvmsg /* ok */ +}; + +struct proto_ops inet6_dgram_ops = { + PF_INET6, + + sock_no_dup, + inet6_release, + inet6_bind, + inet_dgram_connect, /* ok */ + sock_no_socketpair, /* a do nothing */ + inet_accept, /* ok */ + inet6_getname, + datagram_poll, /* ok */ + inet6_ioctl, /* must change */ + sock_no_listen, /* ok */ + inet_shutdown, /* ok */ + inet_setsockopt, /* ok */ + inet_getsockopt, /* ok */ + sock_no_fcntl, /* ok */ + inet_sendmsg, /* ok */ + inet_recvmsg /* ok */ +}; + +struct net_proto_family inet6_family_ops = { + PF_INET6, + inet6_create +}; + +#ifdef CONFIG_PROC_FS +static struct proc_dir_entry proc_net_raw6 = { + PROC_NET_RAW6, 4, "raw6", + S_IFREG | S_IRUGO, 1, 0, 0, + 0, &proc_net_inode_operations, + raw6_get_info +}; +static struct proc_dir_entry proc_net_tcp6 = { + PROC_NET_TCP6, 4, "tcp6", + S_IFREG | S_IRUGO, 1, 0, 0, + 0, &proc_net_inode_operations, + tcp6_get_info +}; +static struct proc_dir_entry proc_net_udp6 = { + PROC_NET_RAW6, 4, "udp6", + S_IFREG | S_IRUGO, 1, 0, 0, + 0, &proc_net_inode_operations, + udp6_get_info +}; +static struct proc_dir_entry proc_net_sockstat6 = { + PROC_NET_SOCKSTAT6, 9, "sockstat6", + S_IFREG | S_IRUGO, 1, 0, 0, + 0, &proc_net_inode_operations, + afinet6_get_info +}; +static struct proc_dir_entry proc_net_snmp6 = { + PROC_NET_SNMP6, 5, "snmp6", + S_IFREG | S_IRUGO, 1, 0, 0, + 0, &proc_net_inode_operations, + afinet6_get_snmp +}; +#endif /* CONFIG_PROC_FS */ + +#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 + +#ifdef MODULE +int init_module(void) +#else +__initfunc(void inet6_proto_init(struct net_proto *pro)) +#endif +{ + struct sk_buff *dummy_skb; + 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 NET4.0\n"); + + if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) + { + printk(KERN_CRIT "inet6_proto_init: size fault\n"); +#ifdef MODULE + return -EINVAL; +#else + return; +#endif + } + + /* + * 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; + 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(); + + /* Create /proc/foo6 entries. */ +#ifdef CONFIG_PROC_FS + proc_net_register(&proc_net_raw6); + proc_net_register(&proc_net_tcp6); + proc_net_register(&proc_net_udp6); + proc_net_register(&proc_net_sockstat6); + proc_net_register(&proc_net_snmp6); +#endif + + /* Now the userspace is allowed to create INET6 sockets. */ + (void) sock_register(&inet6_family_ops); + +#ifdef MODULE + return 0; +#else + return; +#endif + +igmp_fail: + ndisc_cleanup(); +ndisc_fail: + icmpv6_cleanup(); +icmp_fail: +#if defined(MODULE) && defined(CONFIG_SYSCTL) + ipv6_sysctl_unregister(); +#endif +#ifdef MODULE + return err; +#else + return; +#endif +} + +#ifdef MODULE +void cleanup_module(void) +{ + /* First of all disallow new sockets creation. */ + sock_unregister(PF_INET6); +#ifdef CONFIG_PROC_FS + proc_net_unregister(proc_net_raw6.low_ino); + proc_net_unregister(proc_net_tcp6.low_ino); + proc_net_unregister(proc_net_udp6.low_ino); + proc_net_unregister(proc_net_sockstat6.low_ino); + proc_net_unregister(proc_net_snmp6.low_ino); +#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 +} +#endif /* MODULE */ |