![Hannes Frederic Sowa](/assets/img/avatar_default.png)
Some ipv6 protocols cannot handle ipv4 addresses, so we must not allow connecting and binding to them. sendmsg logic does already check msg->name for this but must trust already connected sockets which could be set up for connection to ipv4 address family. Per-socket flag ipv6only is of no use here, as it is under users control by setsockopt. Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
1350 lines
30 KiB
C
1350 lines
30 KiB
C
/*
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* RAW sockets for IPv6
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Adapted from linux/net/ipv4/raw.c
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*
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* Fixes:
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* Hideaki YOSHIFUJI : sin6_scope_id support
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* YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
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* Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/slab.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/in6.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/icmpv6.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/skbuff.h>
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#include <linux/compat.h>
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#include <asm/uaccess.h>
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#include <asm/ioctls.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
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#include <net/sock.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/ndisc.h>
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#include <net/protocol.h>
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#include <net/ip6_route.h>
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#include <net/ip6_checksum.h>
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#include <net/addrconf.h>
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#include <net/transp_v6.h>
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#include <net/udp.h>
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#include <net/inet_common.h>
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#include <net/tcp_states.h>
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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#include <net/mip6.h>
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#endif
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#include <linux/mroute6.h>
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#include <net/raw.h>
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#include <net/rawv6.h>
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#include <net/xfrm.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/export.h>
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#define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
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static struct raw_hashinfo raw_v6_hashinfo = {
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.lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock),
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};
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static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk,
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unsigned short num, const struct in6_addr *loc_addr,
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const struct in6_addr *rmt_addr, int dif)
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{
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bool is_multicast = ipv6_addr_is_multicast(loc_addr);
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sk_for_each_from(sk)
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if (inet_sk(sk)->inet_num == num) {
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if (!net_eq(sock_net(sk), net))
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continue;
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if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
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!ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
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continue;
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if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
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continue;
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if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
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if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
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goto found;
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if (is_multicast &&
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inet6_mc_check(sk, loc_addr, rmt_addr))
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goto found;
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continue;
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}
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goto found;
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}
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sk = NULL;
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found:
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return sk;
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}
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/*
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* 0 - deliver
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* 1 - block
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*/
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static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
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{
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struct icmp6hdr _hdr;
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const struct icmp6hdr *hdr;
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/* We require only the four bytes of the ICMPv6 header, not any
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* additional bytes of message body in "struct icmp6hdr".
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*/
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hdr = skb_header_pointer(skb, skb_transport_offset(skb),
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ICMPV6_HDRLEN, &_hdr);
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if (hdr) {
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const __u32 *data = &raw6_sk(sk)->filter.data[0];
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unsigned int type = hdr->icmp6_type;
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return (data[type >> 5] & (1U << (type & 31))) != 0;
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}
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return 1;
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}
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
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static mh_filter_t __rcu *mh_filter __read_mostly;
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int rawv6_mh_filter_register(mh_filter_t filter)
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{
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rcu_assign_pointer(mh_filter, filter);
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return 0;
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}
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EXPORT_SYMBOL(rawv6_mh_filter_register);
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int rawv6_mh_filter_unregister(mh_filter_t filter)
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{
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RCU_INIT_POINTER(mh_filter, NULL);
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synchronize_rcu();
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return 0;
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}
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EXPORT_SYMBOL(rawv6_mh_filter_unregister);
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#endif
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/*
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* demultiplex raw sockets.
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* (should consider queueing the skb in the sock receive_queue
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* without calling rawv6.c)
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*
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* Caller owns SKB so we must make clones.
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*/
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static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
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{
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const struct in6_addr *saddr;
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const struct in6_addr *daddr;
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struct sock *sk;
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bool delivered = false;
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__u8 hash;
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struct net *net;
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saddr = &ipv6_hdr(skb)->saddr;
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daddr = saddr + 1;
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hash = nexthdr & (RAW_HTABLE_SIZE - 1);
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read_lock(&raw_v6_hashinfo.lock);
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sk = sk_head(&raw_v6_hashinfo.ht[hash]);
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if (sk == NULL)
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goto out;
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net = dev_net(skb->dev);
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sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif);
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while (sk) {
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int filtered;
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delivered = true;
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switch (nexthdr) {
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case IPPROTO_ICMPV6:
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filtered = icmpv6_filter(sk, skb);
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break;
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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case IPPROTO_MH:
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{
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/* XXX: To validate MH only once for each packet,
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* this is placed here. It should be after checking
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* xfrm policy, however it doesn't. The checking xfrm
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* policy is placed in rawv6_rcv() because it is
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* required for each socket.
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*/
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mh_filter_t *filter;
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filter = rcu_dereference(mh_filter);
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filtered = filter ? (*filter)(sk, skb) : 0;
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break;
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}
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#endif
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default:
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filtered = 0;
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break;
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}
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if (filtered < 0)
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break;
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if (filtered == 0) {
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struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
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/* Not releasing hash table! */
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if (clone) {
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nf_reset(clone);
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rawv6_rcv(sk, clone);
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}
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}
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sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
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IP6CB(skb)->iif);
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}
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out:
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read_unlock(&raw_v6_hashinfo.lock);
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return delivered;
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}
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bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
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{
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struct sock *raw_sk;
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raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
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if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
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raw_sk = NULL;
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return raw_sk != NULL;
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}
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/* This cleans up af_inet6 a bit. -DaveM */
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static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
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__be32 v4addr = 0;
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int addr_type;
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int err;
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if (addr_len < SIN6_LEN_RFC2133)
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return -EINVAL;
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if (addr->sin6_family != AF_INET6)
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return -EINVAL;
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addr_type = ipv6_addr_type(&addr->sin6_addr);
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/* Raw sockets are IPv6 only */
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if (addr_type == IPV6_ADDR_MAPPED)
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return -EADDRNOTAVAIL;
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lock_sock(sk);
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err = -EINVAL;
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if (sk->sk_state != TCP_CLOSE)
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goto out;
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rcu_read_lock();
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/* Check if the address belongs to the host. */
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if (addr_type != IPV6_ADDR_ANY) {
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struct net_device *dev = NULL;
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if (__ipv6_addr_needs_scope_id(addr_type)) {
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if (addr_len >= sizeof(struct sockaddr_in6) &&
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addr->sin6_scope_id) {
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/* Override any existing binding, if another
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* one is supplied by user.
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*/
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sk->sk_bound_dev_if = addr->sin6_scope_id;
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}
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/* Binding to link-local address requires an interface */
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if (!sk->sk_bound_dev_if)
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goto out_unlock;
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err = -ENODEV;
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dev = dev_get_by_index_rcu(sock_net(sk),
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sk->sk_bound_dev_if);
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if (!dev)
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goto out_unlock;
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}
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/* ipv4 addr of the socket is invalid. Only the
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* unspecified and mapped address have a v4 equivalent.
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*/
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v4addr = LOOPBACK4_IPV6;
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if (!(addr_type & IPV6_ADDR_MULTICAST)) {
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err = -EADDRNOTAVAIL;
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if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
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dev, 0)) {
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goto out_unlock;
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}
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}
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}
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inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
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sk->sk_v6_rcv_saddr = addr->sin6_addr;
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if (!(addr_type & IPV6_ADDR_MULTICAST))
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np->saddr = addr->sin6_addr;
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err = 0;
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out_unlock:
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rcu_read_unlock();
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out:
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release_sock(sk);
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return err;
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}
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static void rawv6_err(struct sock *sk, struct sk_buff *skb,
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struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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int err;
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int harderr;
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/* Report error on raw socket, if:
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1. User requested recverr.
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2. Socket is connected (otherwise the error indication
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is useless without recverr and error is hard.
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*/
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if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
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return;
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harderr = icmpv6_err_convert(type, code, &err);
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if (type == ICMPV6_PKT_TOOBIG) {
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ip6_sk_update_pmtu(skb, sk, info);
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harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
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}
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if (type == NDISC_REDIRECT) {
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ip6_sk_redirect(skb, sk);
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return;
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}
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if (np->recverr) {
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u8 *payload = skb->data;
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if (!inet->hdrincl)
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payload += offset;
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ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
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}
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if (np->recverr || harderr) {
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sk->sk_err = err;
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sk->sk_error_report(sk);
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}
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}
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void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
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u8 type, u8 code, int inner_offset, __be32 info)
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{
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struct sock *sk;
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int hash;
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const struct in6_addr *saddr, *daddr;
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struct net *net;
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hash = nexthdr & (RAW_HTABLE_SIZE - 1);
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read_lock(&raw_v6_hashinfo.lock);
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sk = sk_head(&raw_v6_hashinfo.ht[hash]);
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if (sk != NULL) {
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/* Note: ipv6_hdr(skb) != skb->data */
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const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
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saddr = &ip6h->saddr;
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daddr = &ip6h->daddr;
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net = dev_net(skb->dev);
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while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
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IP6CB(skb)->iif))) {
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rawv6_err(sk, skb, NULL, type, code,
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inner_offset, info);
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sk = sk_next(sk);
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}
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}
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read_unlock(&raw_v6_hashinfo.lock);
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}
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static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
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{
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if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
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skb_checksum_complete(skb)) {
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atomic_inc(&sk->sk_drops);
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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|
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/* Charge it to the socket. */
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skb_dst_drop(skb);
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if (sock_queue_rcv_skb(sk, skb) < 0) {
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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return 0;
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}
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|
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/*
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* This is next to useless...
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* if we demultiplex in network layer we don't need the extra call
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* just to queue the skb...
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* maybe we could have the network decide upon a hint if it
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* should call raw_rcv for demultiplexing
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*/
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int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct raw6_sock *rp = raw6_sk(sk);
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if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
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atomic_inc(&sk->sk_drops);
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kfree_skb(skb);
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return NET_RX_DROP;
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}
|
|
|
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if (!rp->checksum)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
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if (skb->ip_summed == CHECKSUM_COMPLETE) {
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skb_postpull_rcsum(skb, skb_network_header(skb),
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skb_network_header_len(skb));
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if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
|
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&ipv6_hdr(skb)->daddr,
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skb->len, inet->inet_num, skb->csum))
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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}
|
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if (!skb_csum_unnecessary(skb))
|
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skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
|
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&ipv6_hdr(skb)->daddr,
|
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skb->len,
|
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inet->inet_num, 0));
|
|
|
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if (inet->hdrincl) {
|
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if (skb_checksum_complete(skb)) {
|
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atomic_inc(&sk->sk_drops);
|
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kfree_skb(skb);
|
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return NET_RX_DROP;
|
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}
|
|
}
|
|
|
|
rawv6_rcv_skb(sk, skb);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
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* This should be easy, if there is something there
|
|
* we return it, otherwise we block.
|
|
*/
|
|
|
|
static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk,
|
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struct msghdr *msg, size_t len,
|
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int noblock, int flags, int *addr_len)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
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|
struct sk_buff *skb;
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|
size_t copied;
|
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int err;
|
|
|
|
if (flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (flags & MSG_ERRQUEUE)
|
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return ipv6_recv_error(sk, msg, len, addr_len);
|
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|
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if (np->rxpmtu && np->rxopt.bits.rxpmtu)
|
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return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
|
|
|
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skb = skb_recv_datagram(sk, flags, noblock, &err);
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if (!skb)
|
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goto out;
|
|
|
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copied = skb->len;
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|
if (copied > len) {
|
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copied = len;
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
}
|
|
|
|
if (skb_csum_unnecessary(skb)) {
|
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
|
} else if (msg->msg_flags&MSG_TRUNC) {
|
|
if (__skb_checksum_complete(skb))
|
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goto csum_copy_err;
|
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
|
} else {
|
|
err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov);
|
|
if (err == -EINVAL)
|
|
goto csum_copy_err;
|
|
}
|
|
if (err)
|
|
goto out_free;
|
|
|
|
/* Copy the address. */
|
|
if (sin6) {
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_port = 0;
|
|
sin6->sin6_addr = ipv6_hdr(skb)->saddr;
|
|
sin6->sin6_flowinfo = 0;
|
|
sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
|
|
IP6CB(skb)->iif);
|
|
*addr_len = sizeof(*sin6);
|
|
}
|
|
|
|
sock_recv_ts_and_drops(msg, sk, skb);
|
|
|
|
if (np->rxopt.all)
|
|
ip6_datagram_recv_ctl(sk, msg, skb);
|
|
|
|
err = copied;
|
|
if (flags & MSG_TRUNC)
|
|
err = skb->len;
|
|
|
|
out_free:
|
|
skb_free_datagram(sk, skb);
|
|
out:
|
|
return err;
|
|
|
|
csum_copy_err:
|
|
skb_kill_datagram(sk, skb, flags);
|
|
|
|
/* Error for blocking case is chosen to masquerade
|
|
as some normal condition.
|
|
*/
|
|
err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
|
|
goto out;
|
|
}
|
|
|
|
static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
|
|
struct raw6_sock *rp)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err = 0;
|
|
int offset;
|
|
int len;
|
|
int total_len;
|
|
__wsum tmp_csum;
|
|
__sum16 csum;
|
|
|
|
if (!rp->checksum)
|
|
goto send;
|
|
|
|
if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
|
|
goto out;
|
|
|
|
offset = rp->offset;
|
|
total_len = inet_sk(sk)->cork.base.length;
|
|
if (offset >= total_len - 1) {
|
|
err = -EINVAL;
|
|
ip6_flush_pending_frames(sk);
|
|
goto out;
|
|
}
|
|
|
|
/* should be check HW csum miyazawa */
|
|
if (skb_queue_len(&sk->sk_write_queue) == 1) {
|
|
/*
|
|
* Only one fragment on the socket.
|
|
*/
|
|
tmp_csum = skb->csum;
|
|
} else {
|
|
struct sk_buff *csum_skb = NULL;
|
|
tmp_csum = 0;
|
|
|
|
skb_queue_walk(&sk->sk_write_queue, skb) {
|
|
tmp_csum = csum_add(tmp_csum, skb->csum);
|
|
|
|
if (csum_skb)
|
|
continue;
|
|
|
|
len = skb->len - skb_transport_offset(skb);
|
|
if (offset >= len) {
|
|
offset -= len;
|
|
continue;
|
|
}
|
|
|
|
csum_skb = skb;
|
|
}
|
|
|
|
skb = csum_skb;
|
|
}
|
|
|
|
offset += skb_transport_offset(skb);
|
|
if (skb_copy_bits(skb, offset, &csum, 2))
|
|
BUG();
|
|
|
|
/* in case cksum was not initialized */
|
|
if (unlikely(csum))
|
|
tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
|
|
|
|
csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
|
|
total_len, fl6->flowi6_proto, tmp_csum);
|
|
|
|
if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
|
|
csum = CSUM_MANGLED_0;
|
|
|
|
if (skb_store_bits(skb, offset, &csum, 2))
|
|
BUG();
|
|
|
|
send:
|
|
err = ip6_push_pending_frames(sk);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
|
|
struct flowi6 *fl6, struct dst_entry **dstp,
|
|
unsigned int flags)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct ipv6hdr *iph;
|
|
struct sk_buff *skb;
|
|
int err;
|
|
struct rt6_info *rt = (struct rt6_info *)*dstp;
|
|
int hlen = LL_RESERVED_SPACE(rt->dst.dev);
|
|
int tlen = rt->dst.dev->needed_tailroom;
|
|
|
|
if (length > rt->dst.dev->mtu) {
|
|
ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
|
|
return -EMSGSIZE;
|
|
}
|
|
if (flags&MSG_PROBE)
|
|
goto out;
|
|
|
|
skb = sock_alloc_send_skb(sk,
|
|
length + hlen + tlen + 15,
|
|
flags & MSG_DONTWAIT, &err);
|
|
if (skb == NULL)
|
|
goto error;
|
|
skb_reserve(skb, hlen);
|
|
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
skb->priority = sk->sk_priority;
|
|
skb->mark = sk->sk_mark;
|
|
skb_dst_set(skb, &rt->dst);
|
|
*dstp = NULL;
|
|
|
|
skb_put(skb, length);
|
|
skb_reset_network_header(skb);
|
|
iph = ipv6_hdr(skb);
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
skb->transport_header = skb->network_header;
|
|
err = memcpy_fromiovecend((void *)iph, from, 0, length);
|
|
if (err)
|
|
goto error_fault;
|
|
|
|
IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
|
|
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
|
|
rt->dst.dev, dst_output);
|
|
if (err > 0)
|
|
err = net_xmit_errno(err);
|
|
if (err)
|
|
goto error;
|
|
out:
|
|
return 0;
|
|
|
|
error_fault:
|
|
err = -EFAULT;
|
|
kfree_skb(skb);
|
|
error:
|
|
IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
|
|
if (err == -ENOBUFS && !np->recverr)
|
|
err = 0;
|
|
return err;
|
|
}
|
|
|
|
static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg)
|
|
{
|
|
struct iovec *iov;
|
|
u8 __user *type = NULL;
|
|
u8 __user *code = NULL;
|
|
u8 len = 0;
|
|
int probed = 0;
|
|
int i;
|
|
|
|
if (!msg->msg_iov)
|
|
return 0;
|
|
|
|
for (i = 0; i < msg->msg_iovlen; i++) {
|
|
iov = &msg->msg_iov[i];
|
|
if (!iov)
|
|
continue;
|
|
|
|
switch (fl6->flowi6_proto) {
|
|
case IPPROTO_ICMPV6:
|
|
/* check if one-byte field is readable or not. */
|
|
if (iov->iov_base && iov->iov_len < 1)
|
|
break;
|
|
|
|
if (!type) {
|
|
type = iov->iov_base;
|
|
/* check if code field is readable or not. */
|
|
if (iov->iov_len > 1)
|
|
code = type + 1;
|
|
} else if (!code)
|
|
code = iov->iov_base;
|
|
|
|
if (type && code) {
|
|
if (get_user(fl6->fl6_icmp_type, type) ||
|
|
get_user(fl6->fl6_icmp_code, code))
|
|
return -EFAULT;
|
|
probed = 1;
|
|
}
|
|
break;
|
|
case IPPROTO_MH:
|
|
if (iov->iov_base && iov->iov_len < 1)
|
|
break;
|
|
/* check if type field is readable or not. */
|
|
if (iov->iov_len > 2 - len) {
|
|
u8 __user *p = iov->iov_base;
|
|
if (get_user(fl6->fl6_mh_type, &p[2 - len]))
|
|
return -EFAULT;
|
|
probed = 1;
|
|
} else
|
|
len += iov->iov_len;
|
|
|
|
break;
|
|
default:
|
|
probed = 1;
|
|
break;
|
|
}
|
|
if (probed)
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
|
|
struct msghdr *msg, size_t len)
|
|
{
|
|
struct ipv6_txoptions opt_space;
|
|
DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
|
|
struct in6_addr *daddr, *final_p, final;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct raw6_sock *rp = raw6_sk(sk);
|
|
struct ipv6_txoptions *opt = NULL;
|
|
struct ip6_flowlabel *flowlabel = NULL;
|
|
struct dst_entry *dst = NULL;
|
|
struct flowi6 fl6;
|
|
int addr_len = msg->msg_namelen;
|
|
int hlimit = -1;
|
|
int tclass = -1;
|
|
int dontfrag = -1;
|
|
u16 proto;
|
|
int err;
|
|
|
|
/* Rough check on arithmetic overflow,
|
|
better check is made in ip6_append_data().
|
|
*/
|
|
if (len > INT_MAX)
|
|
return -EMSGSIZE;
|
|
|
|
/* Mirror BSD error message compatibility */
|
|
if (msg->msg_flags & MSG_OOB)
|
|
return -EOPNOTSUPP;
|
|
|
|
/*
|
|
* Get and verify the address.
|
|
*/
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
|
|
fl6.flowi6_mark = sk->sk_mark;
|
|
|
|
if (sin6) {
|
|
if (addr_len < SIN6_LEN_RFC2133)
|
|
return -EINVAL;
|
|
|
|
if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
|
|
return -EAFNOSUPPORT;
|
|
|
|
/* port is the proto value [0..255] carried in nexthdr */
|
|
proto = ntohs(sin6->sin6_port);
|
|
|
|
if (!proto)
|
|
proto = inet->inet_num;
|
|
else if (proto != inet->inet_num)
|
|
return -EINVAL;
|
|
|
|
if (proto > 255)
|
|
return -EINVAL;
|
|
|
|
daddr = &sin6->sin6_addr;
|
|
if (np->sndflow) {
|
|
fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
|
|
if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
|
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
|
|
if (flowlabel == NULL)
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Otherwise it will be difficult to maintain
|
|
* sk->sk_dst_cache.
|
|
*/
|
|
if (sk->sk_state == TCP_ESTABLISHED &&
|
|
ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
|
|
daddr = &sk->sk_v6_daddr;
|
|
|
|
if (addr_len >= sizeof(struct sockaddr_in6) &&
|
|
sin6->sin6_scope_id &&
|
|
__ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
|
|
fl6.flowi6_oif = sin6->sin6_scope_id;
|
|
} else {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
|
|
proto = inet->inet_num;
|
|
daddr = &sk->sk_v6_daddr;
|
|
fl6.flowlabel = np->flow_label;
|
|
}
|
|
|
|
if (fl6.flowi6_oif == 0)
|
|
fl6.flowi6_oif = sk->sk_bound_dev_if;
|
|
|
|
if (msg->msg_controllen) {
|
|
opt = &opt_space;
|
|
memset(opt, 0, sizeof(struct ipv6_txoptions));
|
|
opt->tot_len = sizeof(struct ipv6_txoptions);
|
|
|
|
err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
|
|
&hlimit, &tclass, &dontfrag);
|
|
if (err < 0) {
|
|
fl6_sock_release(flowlabel);
|
|
return err;
|
|
}
|
|
if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
|
|
flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
|
|
if (flowlabel == NULL)
|
|
return -EINVAL;
|
|
}
|
|
if (!(opt->opt_nflen|opt->opt_flen))
|
|
opt = NULL;
|
|
}
|
|
if (opt == NULL)
|
|
opt = np->opt;
|
|
if (flowlabel)
|
|
opt = fl6_merge_options(&opt_space, flowlabel, opt);
|
|
opt = ipv6_fixup_options(&opt_space, opt);
|
|
|
|
fl6.flowi6_proto = proto;
|
|
err = rawv6_probe_proto_opt(&fl6, msg);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (!ipv6_addr_any(daddr))
|
|
fl6.daddr = *daddr;
|
|
else
|
|
fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
|
|
if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
|
|
fl6.saddr = np->saddr;
|
|
|
|
final_p = fl6_update_dst(&fl6, opt, &final);
|
|
|
|
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
|
|
fl6.flowi6_oif = np->mcast_oif;
|
|
else if (!fl6.flowi6_oif)
|
|
fl6.flowi6_oif = np->ucast_oif;
|
|
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
|
|
|
|
dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
|
|
if (IS_ERR(dst)) {
|
|
err = PTR_ERR(dst);
|
|
goto out;
|
|
}
|
|
if (hlimit < 0) {
|
|
if (ipv6_addr_is_multicast(&fl6.daddr))
|
|
hlimit = np->mcast_hops;
|
|
else
|
|
hlimit = np->hop_limit;
|
|
if (hlimit < 0)
|
|
hlimit = ip6_dst_hoplimit(dst);
|
|
}
|
|
|
|
if (tclass < 0)
|
|
tclass = np->tclass;
|
|
|
|
if (dontfrag < 0)
|
|
dontfrag = np->dontfrag;
|
|
|
|
if (msg->msg_flags&MSG_CONFIRM)
|
|
goto do_confirm;
|
|
|
|
back_from_confirm:
|
|
if (inet->hdrincl)
|
|
err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags);
|
|
else {
|
|
lock_sock(sk);
|
|
err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov,
|
|
len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst,
|
|
msg->msg_flags, dontfrag);
|
|
|
|
if (err)
|
|
ip6_flush_pending_frames(sk);
|
|
else if (!(msg->msg_flags & MSG_MORE))
|
|
err = rawv6_push_pending_frames(sk, &fl6, rp);
|
|
release_sock(sk);
|
|
}
|
|
done:
|
|
dst_release(dst);
|
|
out:
|
|
fl6_sock_release(flowlabel);
|
|
return err<0?err:len;
|
|
do_confirm:
|
|
dst_confirm(dst);
|
|
if (!(msg->msg_flags & MSG_PROBE) || len)
|
|
goto back_from_confirm;
|
|
err = 0;
|
|
goto done;
|
|
}
|
|
|
|
static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
|
|
char __user *optval, int optlen)
|
|
{
|
|
switch (optname) {
|
|
case ICMPV6_FILTER:
|
|
if (optlen > sizeof(struct icmp6_filter))
|
|
optlen = sizeof(struct icmp6_filter);
|
|
if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen))
|
|
return -EFAULT;
|
|
return 0;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
int len;
|
|
|
|
switch (optname) {
|
|
case ICMPV6_FILTER:
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
if (len > sizeof(struct icmp6_filter))
|
|
len = sizeof(struct icmp6_filter);
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct raw6_sock *rp = raw6_sk(sk);
|
|
int val;
|
|
|
|
if (get_user(val, (int __user *)optval))
|
|
return -EFAULT;
|
|
|
|
switch (optname) {
|
|
case IPV6_CHECKSUM:
|
|
if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
|
|
level == IPPROTO_IPV6) {
|
|
/*
|
|
* RFC3542 tells that IPV6_CHECKSUM socket
|
|
* option in the IPPROTO_IPV6 level is not
|
|
* allowed on ICMPv6 sockets.
|
|
* If you want to set it, use IPPROTO_RAW
|
|
* level IPV6_CHECKSUM socket option
|
|
* (Linux extension).
|
|
*/
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* You may get strange result with a positive odd offset;
|
|
RFC2292bis agrees with me. */
|
|
if (val > 0 && (val&1))
|
|
return -EINVAL;
|
|
if (val < 0) {
|
|
rp->checksum = 0;
|
|
} else {
|
|
rp->checksum = 1;
|
|
rp->offset = val;
|
|
}
|
|
|
|
return 0;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
}
|
|
|
|
static int rawv6_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
switch (level) {
|
|
case SOL_RAW:
|
|
break;
|
|
|
|
case SOL_ICMPV6:
|
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
|
|
return -EOPNOTSUPP;
|
|
return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
|
|
case SOL_IPV6:
|
|
if (optname == IPV6_CHECKSUM)
|
|
break;
|
|
default:
|
|
return ipv6_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
switch (level) {
|
|
case SOL_RAW:
|
|
break;
|
|
case SOL_ICMPV6:
|
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
|
|
return -EOPNOTSUPP;
|
|
return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
|
|
case SOL_IPV6:
|
|
if (optname == IPV6_CHECKSUM)
|
|
break;
|
|
default:
|
|
return compat_ipv6_setsockopt(sk, level, optname,
|
|
optval, optlen);
|
|
}
|
|
return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct raw6_sock *rp = raw6_sk(sk);
|
|
int val, len;
|
|
|
|
if (get_user(len,optlen))
|
|
return -EFAULT;
|
|
|
|
switch (optname) {
|
|
case IPV6_CHECKSUM:
|
|
/*
|
|
* We allow getsockopt() for IPPROTO_IPV6-level
|
|
* IPV6_CHECKSUM socket option on ICMPv6 sockets
|
|
* since RFC3542 is silent about it.
|
|
*/
|
|
if (rp->checksum == 0)
|
|
val = -1;
|
|
else
|
|
val = rp->offset;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
len = min_t(unsigned int, sizeof(int), len);
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval,&val,len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
|
|
static int rawv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
switch (level) {
|
|
case SOL_RAW:
|
|
break;
|
|
|
|
case SOL_ICMPV6:
|
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
|
|
return -EOPNOTSUPP;
|
|
return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
|
|
case SOL_IPV6:
|
|
if (optname == IPV6_CHECKSUM)
|
|
break;
|
|
default:
|
|
return ipv6_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
switch (level) {
|
|
case SOL_RAW:
|
|
break;
|
|
case SOL_ICMPV6:
|
|
if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
|
|
return -EOPNOTSUPP;
|
|
return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
|
|
case SOL_IPV6:
|
|
if (optname == IPV6_CHECKSUM)
|
|
break;
|
|
default:
|
|
return compat_ipv6_getsockopt(sk, level, optname,
|
|
optval, optlen);
|
|
}
|
|
return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case SIOCOUTQ: {
|
|
int amount = sk_wmem_alloc_get(sk);
|
|
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
case SIOCINQ: {
|
|
struct sk_buff *skb;
|
|
int amount = 0;
|
|
|
|
spin_lock_bh(&sk->sk_receive_queue.lock);
|
|
skb = skb_peek(&sk->sk_receive_queue);
|
|
if (skb != NULL)
|
|
amount = skb_tail_pointer(skb) -
|
|
skb_transport_header(skb);
|
|
spin_unlock_bh(&sk->sk_receive_queue.lock);
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
|
|
default:
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
return ip6mr_ioctl(sk, cmd, (void __user *)arg);
|
|
#else
|
|
return -ENOIOCTLCMD;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case SIOCOUTQ:
|
|
case SIOCINQ:
|
|
return -ENOIOCTLCMD;
|
|
default:
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
|
|
#else
|
|
return -ENOIOCTLCMD;
|
|
#endif
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void rawv6_close(struct sock *sk, long timeout)
|
|
{
|
|
if (inet_sk(sk)->inet_num == IPPROTO_RAW)
|
|
ip6_ra_control(sk, -1);
|
|
ip6mr_sk_done(sk);
|
|
sk_common_release(sk);
|
|
}
|
|
|
|
static void raw6_destroy(struct sock *sk)
|
|
{
|
|
lock_sock(sk);
|
|
ip6_flush_pending_frames(sk);
|
|
release_sock(sk);
|
|
|
|
inet6_destroy_sock(sk);
|
|
}
|
|
|
|
static int rawv6_init_sk(struct sock *sk)
|
|
{
|
|
struct raw6_sock *rp = raw6_sk(sk);
|
|
|
|
switch (inet_sk(sk)->inet_num) {
|
|
case IPPROTO_ICMPV6:
|
|
rp->checksum = 1;
|
|
rp->offset = 2;
|
|
break;
|
|
case IPPROTO_MH:
|
|
rp->checksum = 1;
|
|
rp->offset = 4;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct proto rawv6_prot = {
|
|
.name = "RAWv6",
|
|
.owner = THIS_MODULE,
|
|
.close = rawv6_close,
|
|
.destroy = raw6_destroy,
|
|
.connect = ip6_datagram_connect_v6_only,
|
|
.disconnect = udp_disconnect,
|
|
.ioctl = rawv6_ioctl,
|
|
.init = rawv6_init_sk,
|
|
.setsockopt = rawv6_setsockopt,
|
|
.getsockopt = rawv6_getsockopt,
|
|
.sendmsg = rawv6_sendmsg,
|
|
.recvmsg = rawv6_recvmsg,
|
|
.bind = rawv6_bind,
|
|
.backlog_rcv = rawv6_rcv_skb,
|
|
.hash = raw_hash_sk,
|
|
.unhash = raw_unhash_sk,
|
|
.obj_size = sizeof(struct raw6_sock),
|
|
.h.raw_hash = &raw_v6_hashinfo,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_rawv6_setsockopt,
|
|
.compat_getsockopt = compat_rawv6_getsockopt,
|
|
.compat_ioctl = compat_rawv6_ioctl,
|
|
#endif
|
|
};
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static int raw6_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
if (v == SEQ_START_TOKEN) {
|
|
seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
|
|
} else {
|
|
struct sock *sp = v;
|
|
__u16 srcp = inet_sk(sp)->inet_num;
|
|
ip6_dgram_sock_seq_show(seq, v, srcp, 0,
|
|
raw_seq_private(seq)->bucket);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations raw6_seq_ops = {
|
|
.start = raw_seq_start,
|
|
.next = raw_seq_next,
|
|
.stop = raw_seq_stop,
|
|
.show = raw6_seq_show,
|
|
};
|
|
|
|
static int raw6_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops);
|
|
}
|
|
|
|
static const struct file_operations raw6_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = raw6_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
static int __net_init raw6_init_net(struct net *net)
|
|
{
|
|
if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit raw6_exit_net(struct net *net)
|
|
{
|
|
remove_proc_entry("raw6", net->proc_net);
|
|
}
|
|
|
|
static struct pernet_operations raw6_net_ops = {
|
|
.init = raw6_init_net,
|
|
.exit = raw6_exit_net,
|
|
};
|
|
|
|
int __init raw6_proc_init(void)
|
|
{
|
|
return register_pernet_subsys(&raw6_net_ops);
|
|
}
|
|
|
|
void raw6_proc_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&raw6_net_ops);
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/* Same as inet6_dgram_ops, sans udp_poll. */
|
|
static const struct proto_ops inet6_sockraw_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 = datagram_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 = sock_common_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 struct inet_protosw rawv6_protosw = {
|
|
.type = SOCK_RAW,
|
|
.protocol = IPPROTO_IP, /* wild card */
|
|
.prot = &rawv6_prot,
|
|
.ops = &inet6_sockraw_ops,
|
|
.no_check = UDP_CSUM_DEFAULT,
|
|
.flags = INET_PROTOSW_REUSE,
|
|
};
|
|
|
|
int __init rawv6_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = inet6_register_protosw(&rawv6_protosw);
|
|
if (ret)
|
|
goto out;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void rawv6_exit(void)
|
|
{
|
|
inet6_unregister_protosw(&rawv6_protosw);
|
|
}
|