| /* |
| * PF_INET6 socket protocol family |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * Adapted from linux/net/ipv4/af_inet.c |
| * |
| * 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/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/in.h> |
| #include <linux/kernel.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/slab.h> |
| |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/icmpv6.h> |
| #include <linux/netfilter_ipv6.h> |
| |
| #include <net/ip.h> |
| #include <net/ipv6.h> |
| #include <net/udp.h> |
| #include <net/udplite.h> |
| #include <net/tcp.h> |
| #include <net/ipip.h> |
| #include <net/protocol.h> |
| #include <net/inet_common.h> |
| #include <net/route.h> |
| #include <net/transp_v6.h> |
| #include <net/ip6_route.h> |
| #include <net/addrconf.h> |
| #ifdef CONFIG_IPV6_TUNNEL |
| #include <net/ip6_tunnel.h> |
| #endif |
| |
| #include <asm/uaccess.h> |
| #include <asm/system.h> |
| #include <linux/mroute6.h> |
| |
| MODULE_AUTHOR("Cast of dozens"); |
| MODULE_DESCRIPTION("IPv6 protocol stack for Linux"); |
| MODULE_LICENSE("GPL"); |
| |
| /* The inetsw6 table contains everything that inet6_create needs to |
| * build a new socket. |
| */ |
| static struct list_head inetsw6[SOCK_MAX]; |
| static DEFINE_SPINLOCK(inetsw6_lock); |
| |
| struct ipv6_params ipv6_defaults = { |
| .disable_ipv6 = 0, |
| .autoconf = 1, |
| }; |
| |
| static int disable_ipv6_mod = 0; |
| |
| module_param_named(disable, disable_ipv6_mod, int, 0444); |
| MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional"); |
| |
| module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444); |
| MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces"); |
| |
| module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444); |
| MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces"); |
| |
| static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk) |
| { |
| const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo); |
| |
| return (struct ipv6_pinfo *)(((u8 *)sk) + offset); |
| } |
| |
| static int inet6_create(struct net *net, struct socket *sock, int protocol, |
| int kern) |
| { |
| struct inet_sock *inet; |
| struct ipv6_pinfo *np; |
| struct sock *sk; |
| struct inet_protosw *answer; |
| struct proto *answer_prot; |
| unsigned char answer_flags; |
| char answer_no_check; |
| int try_loading_module = 0; |
| int err; |
| |
| if (sock->type != SOCK_RAW && |
| sock->type != SOCK_DGRAM && |
| !inet_ehash_secret) |
| build_ehash_secret(); |
| |
| /* Look for the requested type/protocol pair. */ |
| lookup_protocol: |
| err = -ESOCKTNOSUPPORT; |
| rcu_read_lock(); |
| list_for_each_entry_rcu(answer, &inetsw6[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 (err) { |
| if (try_loading_module < 2) { |
| rcu_read_unlock(); |
| /* |
| * Be more specific, e.g. net-pf-10-proto-132-type-1 |
| * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) |
| */ |
| if (++try_loading_module == 1) |
| request_module("net-pf-%d-proto-%d-type-%d", |
| PF_INET6, protocol, sock->type); |
| /* |
| * Fall back to generic, e.g. net-pf-10-proto-132 |
| * (net-pf-PF_INET6-proto-IPPROTO_SCTP) |
| */ |
| else |
| request_module("net-pf-%d-proto-%d", |
| PF_INET6, 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; |
| |
| 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_INET6, GFP_KERNEL, answer_prot); |
| if (sk == NULL) |
| goto out; |
| |
| sock_init_data(sock, sk); |
| |
| 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; |
| |
| if (SOCK_RAW == sock->type) { |
| inet->inet_num = protocol; |
| if (IPPROTO_RAW == protocol) |
| inet->hdrincl = 1; |
| } |
| |
| sk->sk_destruct = inet_sock_destruct; |
| sk->sk_family = PF_INET6; |
| sk->sk_protocol = protocol; |
| |
| sk->sk_backlog_rcv = answer->prot->backlog_rcv; |
| |
| inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk); |
| np->hop_limit = -1; |
| np->mcast_hops = IPV6_DEFAULT_MCASTHOPS; |
| np->mc_loop = 1; |
| np->pmtudisc = IPV6_PMTUDISC_WANT; |
| np->ipv6only = net->ipv6.sysctl.bindv6only; |
| |
| /* Init the ipv4 part of the socket since we can have sockets |
| * using v6 API for ipv4. |
| */ |
| inet->uc_ttl = -1; |
| |
| inet->mc_loop = 1; |
| inet->mc_ttl = 1; |
| inet->mc_index = 0; |
| inet->mc_list = NULL; |
| |
| if (ipv4_config.no_pmtu_disc) |
| inet->pmtudisc = IP_PMTUDISC_DONT; |
| else |
| inet->pmtudisc = IP_PMTUDISC_WANT; |
| /* |
| * Increment only the relevant sk_prot->socks debug field, this changes |
| * the previous behaviour of incrementing both the equivalent to |
| * answer->prot->socks (inet6_sock_nr) and inet_sock_nr. |
| * |
| * This allows better debug granularity as we'll know exactly how many |
| * UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6 |
| * transport protocol socks. -acme |
| */ |
| 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); |
| sk->sk_prot->hash(sk); |
| } |
| if (sk->sk_prot->init) { |
| err = sk->sk_prot->init(sk); |
| if (err) { |
| sk_common_release(sk); |
| goto out; |
| } |
| } |
| out: |
| return err; |
| out_rcu_unlock: |
| rcu_read_unlock(); |
| goto out; |
| } |
| |
| |
| /* bind for INET6 API */ |
| 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; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct net *net = sock_net(sk); |
| __be32 v4addr = 0; |
| unsigned short snum; |
| int addr_type = 0; |
| int err = 0; |
| |
| /* If the socket has its own bind function then use it. */ |
| if (sk->sk_prot->bind) |
| return sk->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; |
| |
| 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->sk_state != TCP_CLOSE || inet->inet_num) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| /* Check if the address belongs to the host. */ |
| if (addr_type == IPV6_ADDR_MAPPED) { |
| int chk_addr_ret; |
| |
| /* Binding to v4-mapped address on a v6-only socket |
| * makes no sense |
| */ |
| if (np->ipv6only) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| /* Reproduce AF_INET checks to make the bindings consitant */ |
| v4addr = addr->sin6_addr.s6_addr32[3]; |
| chk_addr_ret = inet_addr_type(net, v4addr); |
| if (!sysctl_ip_nonlocal_bind && |
| !(inet->freebind || inet->transparent) && |
| v4addr != htonl(INADDR_ANY) && |
| chk_addr_ret != RTN_LOCAL && |
| chk_addr_ret != RTN_MULTICAST && |
| chk_addr_ret != RTN_BROADCAST) { |
| err = -EADDRNOTAVAIL; |
| goto out; |
| } |
| } else { |
| if (addr_type != IPV6_ADDR_ANY) { |
| struct net_device *dev = NULL; |
| |
| rcu_read_lock(); |
| 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->sk_bound_dev_if = addr->sin6_scope_id; |
| } |
| |
| /* Binding to link-local address requires an interface */ |
| if (!sk->sk_bound_dev_if) { |
| err = -EINVAL; |
| goto out_unlock; |
| } |
| dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); |
| if (!dev) { |
| err = -ENODEV; |
| goto out_unlock; |
| } |
| } |
| |
| /* ipv4 addr of the socket is invalid. Only the |
| * unspecified and mapped address have a v4 equivalent. |
| */ |
| v4addr = LOOPBACK4_IPV6; |
| if (!(addr_type & IPV6_ADDR_MULTICAST)) { |
| if (!ipv6_chk_addr(net, &addr->sin6_addr, |
| dev, 0)) { |
| err = -EADDRNOTAVAIL; |
| goto out_unlock; |
| } |
| } |
| rcu_read_unlock(); |
| } |
| } |
| |
| inet->inet_rcv_saddr = v4addr; |
| inet->inet_saddr = v4addr; |
| |
| ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr); |
| |
| if (!(addr_type & IPV6_ADDR_MULTICAST)) |
| ipv6_addr_copy(&np->saddr, &addr->sin6_addr); |
| |
| /* Make sure we are allowed to bind here. */ |
| if (sk->sk_prot->get_port(sk, snum)) { |
| inet_reset_saddr(sk); |
| err = -EADDRINUSE; |
| goto out; |
| } |
| |
| if (addr_type != IPV6_ADDR_ANY) { |
| sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
| if (addr_type != IPV6_ADDR_MAPPED) |
| np->ipv6only = 1; |
| } |
| if (snum) |
| sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
| inet->inet_sport = htons(inet->inet_num); |
| inet->inet_dport = 0; |
| inet->inet_daddr = 0; |
| out: |
| release_sock(sk); |
| return err; |
| out_unlock: |
| rcu_read_unlock(); |
| goto out; |
| } |
| |
| EXPORT_SYMBOL(inet6_bind); |
| |
| int inet6_release(struct socket *sock) |
| { |
| struct sock *sk = sock->sk; |
| |
| if (sk == NULL) |
| return -EINVAL; |
| |
| /* Free mc lists */ |
| ipv6_sock_mc_close(sk); |
| |
| /* Free ac lists */ |
| ipv6_sock_ac_close(sk); |
| |
| return inet_release(sock); |
| } |
| |
| EXPORT_SYMBOL(inet6_release); |
| |
| void inet6_destroy_sock(struct sock *sk) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sk_buff *skb; |
| struct ipv6_txoptions *opt; |
| |
| /* Release rx options */ |
| |
| if ((skb = xchg(&np->pktoptions, NULL)) != NULL) |
| kfree_skb(skb); |
| |
| if ((skb = xchg(&np->rxpmtu, NULL)) != NULL) |
| kfree_skb(skb); |
| |
| /* Free flowlabels */ |
| fl6_free_socklist(sk); |
| |
| /* Free tx options */ |
| |
| if ((opt = xchg(&np->opt, NULL)) != NULL) |
| sock_kfree_s(sk, opt, opt->tot_len); |
| } |
| |
| EXPORT_SYMBOL_GPL(inet6_destroy_sock); |
| |
| /* |
| * This does both peername and sockname. |
| */ |
| |
| 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; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| sin->sin6_family = AF_INET6; |
| sin->sin6_flowinfo = 0; |
| sin->sin6_scope_id = 0; |
| if (peer) { |
| if (!inet->inet_dport) |
| return -ENOTCONN; |
| if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) && |
| peer == 1) |
| return -ENOTCONN; |
| sin->sin6_port = inet->inet_dport; |
| ipv6_addr_copy(&sin->sin6_addr, &np->daddr); |
| if (np->sndflow) |
| sin->sin6_flowinfo = np->flow_label; |
| } else { |
| if (ipv6_addr_any(&np->rcv_saddr)) |
| ipv6_addr_copy(&sin->sin6_addr, &np->saddr); |
| else |
| ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr); |
| |
| sin->sin6_port = inet->inet_sport; |
| } |
| if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| sin->sin6_scope_id = sk->sk_bound_dev_if; |
| *uaddr_len = sizeof(*sin); |
| return 0; |
| } |
| |
| EXPORT_SYMBOL(inet6_getname); |
| |
| int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| { |
| struct sock *sk = sock->sk; |
| struct net *net = sock_net(sk); |
| |
| switch(cmd) |
| { |
| case SIOCGSTAMP: |
| return sock_get_timestamp(sk, (struct timeval __user *)arg); |
| |
| case SIOCGSTAMPNS: |
| return sock_get_timestampns(sk, (struct timespec __user *)arg); |
| |
| case SIOCADDRT: |
| case SIOCDELRT: |
| |
| return ipv6_route_ioctl(net, cmd, (void __user *)arg); |
| |
| case SIOCSIFADDR: |
| return addrconf_add_ifaddr(net, (void __user *) arg); |
| case SIOCDIFADDR: |
| return addrconf_del_ifaddr(net, (void __user *) arg); |
| case SIOCSIFDSTADDR: |
| return addrconf_set_dstaddr(net, (void __user *) arg); |
| default: |
| if (!sk->sk_prot->ioctl) |
| return -ENOIOCTLCMD; |
| return sk->sk_prot->ioctl(sk, cmd, arg); |
| } |
| /*NOTREACHED*/ |
| return 0; |
| } |
| |
| EXPORT_SYMBOL(inet6_ioctl); |
| |
| const struct proto_ops inet6_stream_ops = { |
| .family = PF_INET6, |
| .owner = THIS_MODULE, |
| .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 = sock_common_setsockopt, /* ok */ |
| .getsockopt = sock_common_getsockopt, /* ok */ |
| .sendmsg = inet_sendmsg, /* ok */ |
| .recvmsg = inet_recvmsg, /* ok */ |
| .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, |
| #endif |
| }; |
| |
| const struct proto_ops inet6_dgram_ops = { |
| .family = PF_INET6, |
| .owner = THIS_MODULE, |
| .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 = udp_poll, /* ok */ |
| .ioctl = inet6_ioctl, /* must change */ |
| .listen = sock_no_listen, /* ok */ |
| .shutdown = inet_shutdown, /* ok */ |
| .setsockopt = sock_common_setsockopt, /* ok */ |
| .getsockopt = sock_common_getsockopt, /* ok */ |
| .sendmsg = inet_sendmsg, /* ok */ |
| .recvmsg = inet_recvmsg, /* ok */ |
| .mmap = sock_no_mmap, |
| .sendpage = sock_no_sendpage, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_sock_common_setsockopt, |
| .compat_getsockopt = compat_sock_common_getsockopt, |
| #endif |
| }; |
| |
| static const struct net_proto_family inet6_family_ops = { |
| .family = PF_INET6, |
| .create = inet6_create, |
| .owner = THIS_MODULE, |
| }; |
| |
| int inet6_register_protosw(struct inet_protosw *p) |
| { |
| struct list_head *lh; |
| struct inet_protosw *answer; |
| struct list_head *last_perm; |
| int protocol = p->protocol; |
| int ret; |
| |
| spin_lock_bh(&inetsw6_lock); |
| |
| ret = -EINVAL; |
| if (p->type >= SOCK_MAX) |
| goto out_illegal; |
| |
| /* If we are trying to override a permanent protocol, bail. */ |
| answer = NULL; |
| ret = -EPERM; |
| last_perm = &inetsw6[p->type]; |
| list_for_each(lh, &inetsw6[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); |
| ret = 0; |
| out: |
| spin_unlock_bh(&inetsw6_lock); |
| return ret; |
| |
| 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(inet6_register_protosw); |
| |
| void |
| inet6_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(&inetsw6_lock); |
| list_del_rcu(&p->list); |
| spin_unlock_bh(&inetsw6_lock); |
| |
| synchronize_net(); |
| } |
| } |
| |
| EXPORT_SYMBOL(inet6_unregister_protosw); |
| |
| int inet6_sk_rebuild_header(struct sock *sk) |
| { |
| int err; |
| struct dst_entry *dst; |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| dst = __sk_dst_check(sk, np->dst_cookie); |
| |
| if (dst == NULL) { |
| struct inet_sock *inet = inet_sk(sk); |
| struct in6_addr *final_p, final; |
| struct flowi fl; |
| |
| memset(&fl, 0, sizeof(fl)); |
| fl.proto = sk->sk_protocol; |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| fl.fl6_flowlabel = np->flow_label; |
| fl.oif = sk->sk_bound_dev_if; |
| fl.mark = sk->sk_mark; |
| fl.fl_ip_dport = inet->inet_dport; |
| fl.fl_ip_sport = inet->inet_sport; |
| security_sk_classify_flow(sk, &fl); |
| |
| final_p = fl6_update_dst(&fl, np->opt, &final); |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) { |
| sk->sk_route_caps = 0; |
| return err; |
| } |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) { |
| sk->sk_err_soft = -err; |
| return err; |
| } |
| |
| __ip6_dst_store(sk, dst, NULL, NULL); |
| } |
| |
| return 0; |
| } |
| |
| EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header); |
| |
| int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct inet6_skb_parm *opt = IP6CB(skb); |
| |
| if (np->rxopt.all) { |
| if ((opt->hop && (np->rxopt.bits.hopopts || |
| np->rxopt.bits.ohopopts)) || |
| ((IPV6_FLOWINFO_MASK & |
| *(__be32 *)skb_network_header(skb)) && |
| np->rxopt.bits.rxflow) || |
| (opt->srcrt && (np->rxopt.bits.srcrt || |
| np->rxopt.bits.osrcrt)) || |
| ((opt->dst1 || opt->dst0) && |
| (np->rxopt.bits.dstopts || np->rxopt.bits.odstopts))) |
| return 1; |
| } |
| return 0; |
| } |
| |
| EXPORT_SYMBOL_GPL(ipv6_opt_accepted); |
| |
| static int ipv6_gso_pull_exthdrs(struct sk_buff *skb, int proto) |
| { |
| const struct inet6_protocol *ops = NULL; |
| |
| for (;;) { |
| struct ipv6_opt_hdr *opth; |
| int len; |
| |
| if (proto != NEXTHDR_HOP) { |
| ops = rcu_dereference(inet6_protos[proto]); |
| |
| if (unlikely(!ops)) |
| break; |
| |
| if (!(ops->flags & INET6_PROTO_GSO_EXTHDR)) |
| break; |
| } |
| |
| if (unlikely(!pskb_may_pull(skb, 8))) |
| break; |
| |
| opth = (void *)skb->data; |
| len = ipv6_optlen(opth); |
| |
| if (unlikely(!pskb_may_pull(skb, len))) |
| break; |
| |
| proto = opth->nexthdr; |
| __skb_pull(skb, len); |
| } |
| |
| return proto; |
| } |
| |
| static int ipv6_gso_send_check(struct sk_buff *skb) |
| { |
| struct ipv6hdr *ipv6h; |
| const struct inet6_protocol *ops; |
| int err = -EINVAL; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) |
| goto out; |
| |
| ipv6h = ipv6_hdr(skb); |
| __skb_pull(skb, sizeof(*ipv6h)); |
| err = -EPROTONOSUPPORT; |
| |
| rcu_read_lock(); |
| ops = rcu_dereference(inet6_protos[ |
| ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr)]); |
| |
| if (likely(ops && ops->gso_send_check)) { |
| skb_reset_transport_header(skb); |
| err = ops->gso_send_check(skb); |
| } |
| rcu_read_unlock(); |
| |
| out: |
| return err; |
| } |
| |
| static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features) |
| { |
| struct sk_buff *segs = ERR_PTR(-EINVAL); |
| struct ipv6hdr *ipv6h; |
| const struct inet6_protocol *ops; |
| int proto; |
| struct frag_hdr *fptr; |
| unsigned int unfrag_ip6hlen; |
| u8 *prevhdr; |
| int offset = 0; |
| |
| if (!(features & NETIF_F_V6_CSUM)) |
| features &= ~NETIF_F_SG; |
| |
| if (unlikely(skb_shinfo(skb)->gso_type & |
| ~(SKB_GSO_UDP | |
| SKB_GSO_DODGY | |
| SKB_GSO_TCP_ECN | |
| SKB_GSO_TCPV6 | |
| 0))) |
| goto out; |
| |
| if (unlikely(!pskb_may_pull(skb, sizeof(*ipv6h)))) |
| goto out; |
| |
| ipv6h = ipv6_hdr(skb); |
| __skb_pull(skb, sizeof(*ipv6h)); |
| segs = ERR_PTR(-EPROTONOSUPPORT); |
| |
| proto = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr); |
| rcu_read_lock(); |
| ops = rcu_dereference(inet6_protos[proto]); |
| if (likely(ops && ops->gso_segment)) { |
| skb_reset_transport_header(skb); |
| segs = ops->gso_segment(skb, features); |
| } |
| rcu_read_unlock(); |
| |
| if (unlikely(IS_ERR(segs))) |
| goto out; |
| |
| for (skb = segs; skb; skb = skb->next) { |
| ipv6h = ipv6_hdr(skb); |
| ipv6h->payload_len = htons(skb->len - skb->mac_len - |
| sizeof(*ipv6h)); |
| if (proto == IPPROTO_UDP) { |
| unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); |
| fptr = (struct frag_hdr *)(skb_network_header(skb) + |
| unfrag_ip6hlen); |
| fptr->frag_off = htons(offset); |
| if (skb->next != NULL) |
| fptr->frag_off |= htons(IP6_MF); |
| offset += (ntohs(ipv6h->payload_len) - |
| sizeof(struct frag_hdr)); |
| } |
| } |
| |
| out: |
| return segs; |
| } |
| |
| struct ipv6_gro_cb { |
| struct napi_gro_cb napi; |
| int proto; |
| }; |
| |
| #define IPV6_GRO_CB(skb) ((struct ipv6_gro_cb *)(skb)->cb) |
| |
| static struct sk_buff **ipv6_gro_receive(struct sk_buff **head, |
| struct sk_buff *skb) |
| { |
| const struct inet6_protocol *ops; |
| struct sk_buff **pp = NULL; |
| struct sk_buff *p; |
| struct ipv6hdr *iph; |
| unsigned int nlen; |
| unsigned int hlen; |
| unsigned int off; |
| int flush = 1; |
| int proto; |
| __wsum csum; |
| |
| 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; |
| } |
| |
| skb_gro_pull(skb, sizeof(*iph)); |
| skb_set_transport_header(skb, skb_gro_offset(skb)); |
| |
| flush += ntohs(iph->payload_len) != skb_gro_len(skb); |
| |
| rcu_read_lock(); |
| proto = iph->nexthdr; |
| ops = rcu_dereference(inet6_protos[proto]); |
| if (!ops || !ops->gro_receive) { |
| __pskb_pull(skb, skb_gro_offset(skb)); |
| proto = ipv6_gso_pull_exthdrs(skb, proto); |
| skb_gro_pull(skb, -skb_transport_offset(skb)); |
| skb_reset_transport_header(skb); |
| __skb_push(skb, skb_gro_offset(skb)); |
| |
| if (!ops || !ops->gro_receive) |
| goto out_unlock; |
| |
| iph = ipv6_hdr(skb); |
| } |
| |
| IPV6_GRO_CB(skb)->proto = proto; |
| |
| flush--; |
| nlen = skb_network_header_len(skb); |
| |
| for (p = *head; p; p = p->next) { |
| struct ipv6hdr *iph2; |
| |
| if (!NAPI_GRO_CB(p)->same_flow) |
| continue; |
| |
| iph2 = ipv6_hdr(p); |
| |
| /* All fields must match except length. */ |
| if (nlen != skb_network_header_len(p) || |
| memcmp(iph, iph2, offsetof(struct ipv6hdr, payload_len)) || |
| memcmp(&iph->nexthdr, &iph2->nexthdr, |
| nlen - offsetof(struct ipv6hdr, nexthdr))) { |
| NAPI_GRO_CB(p)->same_flow = 0; |
| continue; |
| } |
| |
| NAPI_GRO_CB(p)->flush |= flush; |
| } |
| |
| NAPI_GRO_CB(skb)->flush |= flush; |
| |
| csum = skb->csum; |
| skb_postpull_rcsum(skb, iph, skb_network_header_len(skb)); |
| |
| pp = ops->gro_receive(head, skb); |
| |
| skb->csum = csum; |
| |
| out_unlock: |
| rcu_read_unlock(); |
| |
| out: |
| NAPI_GRO_CB(skb)->flush |= flush; |
| |
| return pp; |
| } |
| |
| static int ipv6_gro_complete(struct sk_buff *skb) |
| { |
| const struct inet6_protocol *ops; |
| struct ipv6hdr *iph = ipv6_hdr(skb); |
| int err = -ENOSYS; |
| |
| iph->payload_len = htons(skb->len - skb_network_offset(skb) - |
| sizeof(*iph)); |
| |
| rcu_read_lock(); |
| ops = rcu_dereference(inet6_protos[IPV6_GRO_CB(skb)->proto]); |
| if (WARN_ON(!ops || !ops->gro_complete)) |
| goto out_unlock; |
| |
| err = ops->gro_complete(skb); |
| |
| out_unlock: |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| |
| static struct packet_type ipv6_packet_type __read_mostly = { |
| .type = cpu_to_be16(ETH_P_IPV6), |
| .func = ipv6_rcv, |
| .gso_send_check = ipv6_gso_send_check, |
| .gso_segment = ipv6_gso_segment, |
| .gro_receive = ipv6_gro_receive, |
| .gro_complete = ipv6_gro_complete, |
| }; |
| |
| static int __init ipv6_packet_init(void) |
| { |
| dev_add_pack(&ipv6_packet_type); |
| return 0; |
| } |
| |
| static void ipv6_packet_cleanup(void) |
| { |
| dev_remove_pack(&ipv6_packet_type); |
| } |
| |
| static int __net_init ipv6_init_mibs(struct net *net) |
| { |
| if (snmp_mib_init((void __percpu **)net->mib.udp_stats_in6, |
| sizeof(struct udp_mib), |
| __alignof__(struct udp_mib)) < 0) |
| return -ENOMEM; |
| if (snmp_mib_init((void __percpu **)net->mib.udplite_stats_in6, |
| sizeof(struct udp_mib), |
| __alignof__(struct udp_mib)) < 0) |
| goto err_udplite_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.ipv6_statistics, |
| sizeof(struct ipstats_mib), |
| __alignof__(struct ipstats_mib)) < 0) |
| goto err_ip_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.icmpv6_statistics, |
| sizeof(struct icmpv6_mib), |
| __alignof__(struct icmpv6_mib)) < 0) |
| goto err_icmp_mib; |
| if (snmp_mib_init((void __percpu **)net->mib.icmpv6msg_statistics, |
| sizeof(struct icmpv6msg_mib), |
| __alignof__(struct icmpv6msg_mib)) < 0) |
| goto err_icmpmsg_mib; |
| return 0; |
| |
| err_icmpmsg_mib: |
| snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); |
| err_icmp_mib: |
| snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); |
| err_ip_mib: |
| snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); |
| err_udplite_mib: |
| snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); |
| return -ENOMEM; |
| } |
| |
| static void ipv6_cleanup_mibs(struct net *net) |
| { |
| snmp_mib_free((void __percpu **)net->mib.udp_stats_in6); |
| snmp_mib_free((void __percpu **)net->mib.udplite_stats_in6); |
| snmp_mib_free((void __percpu **)net->mib.ipv6_statistics); |
| snmp_mib_free((void __percpu **)net->mib.icmpv6_statistics); |
| snmp_mib_free((void __percpu **)net->mib.icmpv6msg_statistics); |
| } |
| |
| static int __net_init inet6_net_init(struct net *net) |
| { |
| int err = 0; |
| |
| net->ipv6.sysctl.bindv6only = 0; |
| net->ipv6.sysctl.icmpv6_time = 1*HZ; |
| |
| err = ipv6_init_mibs(net); |
| if (err) |
| return err; |
| #ifdef CONFIG_PROC_FS |
| err = udp6_proc_init(net); |
| if (err) |
| goto out; |
| err = tcp6_proc_init(net); |
| if (err) |
| goto proc_tcp6_fail; |
| err = ac6_proc_init(net); |
| if (err) |
| goto proc_ac6_fail; |
| #endif |
| return err; |
| |
| #ifdef CONFIG_PROC_FS |
| proc_ac6_fail: |
| tcp6_proc_exit(net); |
| proc_tcp6_fail: |
| udp6_proc_exit(net); |
| out: |
| ipv6_cleanup_mibs(net); |
| return err; |
| #endif |
| } |
| |
| static void __net_exit inet6_net_exit(struct net *net) |
| { |
| #ifdef CONFIG_PROC_FS |
| udp6_proc_exit(net); |
| tcp6_proc_exit(net); |
| ac6_proc_exit(net); |
| #endif |
| ipv6_cleanup_mibs(net); |
| } |
| |
| static struct pernet_operations inet6_net_ops = { |
| .init = inet6_net_init, |
| .exit = inet6_net_exit, |
| }; |
| |
| static int __init inet6_init(void) |
| { |
| struct sk_buff *dummy_skb; |
| struct list_head *r; |
| int err = 0; |
| |
| BUILD_BUG_ON(sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)); |
| |
| /* Register the socket-side information for inet6_create. */ |
| for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r) |
| INIT_LIST_HEAD(r); |
| |
| if (disable_ipv6_mod) { |
| printk(KERN_INFO |
| "IPv6: Loaded, but administratively disabled, " |
| "reboot required to enable\n"); |
| goto out; |
| } |
| |
| err = proto_register(&tcpv6_prot, 1); |
| if (err) |
| goto out; |
| |
| err = proto_register(&udpv6_prot, 1); |
| if (err) |
| goto out_unregister_tcp_proto; |
| |
| err = proto_register(&udplitev6_prot, 1); |
| if (err) |
| goto out_unregister_udp_proto; |
| |
| err = proto_register(&rawv6_prot, 1); |
| if (err) |
| goto out_unregister_udplite_proto; |
| |
| |
| /* We MUST register RAW sockets before we create the ICMP6, |
| * IGMP6, or NDISC control sockets. |
| */ |
| err = rawv6_init(); |
| if (err) |
| goto out_unregister_raw_proto; |
| |
| /* Register the family here so that the init calls below will |
| * be able to create sockets. (?? is this dangerous ??) |
| */ |
| err = sock_register(&inet6_family_ops); |
| if (err) |
| goto out_sock_register_fail; |
| |
| #ifdef CONFIG_SYSCTL |
| err = ipv6_static_sysctl_register(); |
| if (err) |
| goto static_sysctl_fail; |
| #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. |
| */ |
| |
| err = register_pernet_subsys(&inet6_net_ops); |
| if (err) |
| goto register_pernet_fail; |
| err = icmpv6_init(); |
| if (err) |
| goto icmp_fail; |
| err = ip6_mr_init(); |
| if (err) |
| goto ipmr_fail; |
| err = ndisc_init(); |
| if (err) |
| goto ndisc_fail; |
| err = igmp6_init(); |
| if (err) |
| goto igmp_fail; |
| err = ipv6_netfilter_init(); |
| if (err) |
| goto netfilter_fail; |
| /* Create /proc/foo6 entries. */ |
| #ifdef CONFIG_PROC_FS |
| err = -ENOMEM; |
| if (raw6_proc_init()) |
| goto proc_raw6_fail; |
| if (udplite6_proc_init()) |
| goto proc_udplite6_fail; |
| if (ipv6_misc_proc_init()) |
| goto proc_misc6_fail; |
| if (if6_proc_init()) |
| goto proc_if6_fail; |
| #endif |
| err = ip6_route_init(); |
| if (err) |
| goto ip6_route_fail; |
| err = ip6_flowlabel_init(); |
| if (err) |
| goto ip6_flowlabel_fail; |
| err = addrconf_init(); |
| if (err) |
| goto addrconf_fail; |
| |
| /* Init v6 extension headers. */ |
| err = ipv6_exthdrs_init(); |
| if (err) |
| goto ipv6_exthdrs_fail; |
| |
| err = ipv6_frag_init(); |
| if (err) |
| goto ipv6_frag_fail; |
| |
| /* Init v6 transport protocols. */ |
| err = udpv6_init(); |
| if (err) |
| goto udpv6_fail; |
| |
| err = udplitev6_init(); |
| if (err) |
| goto udplitev6_fail; |
| |
| err = tcpv6_init(); |
| if (err) |
| goto tcpv6_fail; |
| |
| err = ipv6_packet_init(); |
| if (err) |
| goto ipv6_packet_fail; |
| |
| #ifdef CONFIG_SYSCTL |
| err = ipv6_sysctl_register(); |
| if (err) |
| goto sysctl_fail; |
| #endif |
| out: |
| return err; |
| |
| #ifdef CONFIG_SYSCTL |
| sysctl_fail: |
| ipv6_packet_cleanup(); |
| #endif |
| ipv6_packet_fail: |
| tcpv6_exit(); |
| tcpv6_fail: |
| udplitev6_exit(); |
| udplitev6_fail: |
| udpv6_exit(); |
| udpv6_fail: |
| ipv6_frag_exit(); |
| ipv6_frag_fail: |
| ipv6_exthdrs_exit(); |
| ipv6_exthdrs_fail: |
| addrconf_cleanup(); |
| addrconf_fail: |
| ip6_flowlabel_cleanup(); |
| ip6_flowlabel_fail: |
| ip6_route_cleanup(); |
| ip6_route_fail: |
| #ifdef CONFIG_PROC_FS |
| if6_proc_exit(); |
| proc_if6_fail: |
| ipv6_misc_proc_exit(); |
| proc_misc6_fail: |
| udplite6_proc_exit(); |
| proc_udplite6_fail: |
| raw6_proc_exit(); |
| proc_raw6_fail: |
| #endif |
| ipv6_netfilter_fini(); |
| netfilter_fail: |
| igmp6_cleanup(); |
| igmp_fail: |
| ndisc_cleanup(); |
| ndisc_fail: |
| ip6_mr_cleanup(); |
| ipmr_fail: |
| icmpv6_cleanup(); |
| icmp_fail: |
| unregister_pernet_subsys(&inet6_net_ops); |
| register_pernet_fail: |
| #ifdef CONFIG_SYSCTL |
| ipv6_static_sysctl_unregister(); |
| static_sysctl_fail: |
| #endif |
| sock_unregister(PF_INET6); |
| rtnl_unregister_all(PF_INET6); |
| out_sock_register_fail: |
| rawv6_exit(); |
| out_unregister_raw_proto: |
| proto_unregister(&rawv6_prot); |
| out_unregister_udplite_proto: |
| proto_unregister(&udplitev6_prot); |
| out_unregister_udp_proto: |
| proto_unregister(&udpv6_prot); |
| out_unregister_tcp_proto: |
| proto_unregister(&tcpv6_prot); |
| goto out; |
| } |
| module_init(inet6_init); |
| |
| static void __exit inet6_exit(void) |
| { |
| if (disable_ipv6_mod) |
| return; |
| |
| /* First of all disallow new sockets creation. */ |
| sock_unregister(PF_INET6); |
| /* Disallow any further netlink messages */ |
| rtnl_unregister_all(PF_INET6); |
| |
| #ifdef CONFIG_SYSCTL |
| ipv6_sysctl_unregister(); |
| #endif |
| udpv6_exit(); |
| udplitev6_exit(); |
| tcpv6_exit(); |
| |
| /* Cleanup code parts. */ |
| ipv6_packet_cleanup(); |
| ipv6_frag_exit(); |
| ipv6_exthdrs_exit(); |
| addrconf_cleanup(); |
| ip6_flowlabel_cleanup(); |
| ip6_route_cleanup(); |
| #ifdef CONFIG_PROC_FS |
| |
| /* Cleanup code parts. */ |
| if6_proc_exit(); |
| ipv6_misc_proc_exit(); |
| udplite6_proc_exit(); |
| raw6_proc_exit(); |
| #endif |
| ipv6_netfilter_fini(); |
| igmp6_cleanup(); |
| ndisc_cleanup(); |
| ip6_mr_cleanup(); |
| icmpv6_cleanup(); |
| rawv6_exit(); |
| |
| unregister_pernet_subsys(&inet6_net_ops); |
| #ifdef CONFIG_SYSCTL |
| ipv6_static_sysctl_unregister(); |
| #endif |
| proto_unregister(&rawv6_prot); |
| proto_unregister(&udplitev6_prot); |
| proto_unregister(&udpv6_prot); |
| proto_unregister(&tcpv6_prot); |
| |
| rcu_barrier(); /* Wait for completion of call_rcu()'s */ |
| } |
| module_exit(inet6_exit); |
| |
| MODULE_ALIAS_NETPROTO(PF_INET6); |