Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1319 insertions, 0 deletions

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
new file mode 100644
index 000000000..dc31752a7
--- /dev/null
+++ b/net/ipv6/raw.c
@@ -0,0 +1,1319 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *	RAW sockets for IPv6
+ *	Linux INET6 implementation
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>
+ *
+ *	Adapted from linux/net/ipv4/raw.c
+ *
+ *	Fixes:
+ *	Hideaki YOSHIFUJI	:	sin6_scope_id support
+ *	YOSHIFUJI,H.@USAGI	:	raw checksum (RFC2292(bis) compliance)
+ *	Kazunori MIYAZAWA @USAGI:	change process style to use ip6_append_data
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/slab.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/icmpv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/skbuff.h>
+#include <linux/compat.h>
+#include <linux/uaccess.h>
+#include <asm/ioctls.h>
+
+#include <net/net_namespace.h>
+#include <net/ip.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/ip6_route.h>
+#include <net/ip6_checksum.h>
+#include <net/addrconf.h>
+#include <net/transp_v6.h>
+#include <net/udp.h>
+#include <net/inet_common.h>
+#include <net/tcp_states.h>
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+#include <net/mip6.h>
+#endif
+#include <linux/mroute6.h>
+
+#include <net/raw.h>
+#include <net/rawv6.h>
+#include <net/xfrm.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/export.h>
+
+#define	ICMPV6_HDRLEN	4	/* ICMPv6 header, RFC 4443 Section 2.1 */
+
+struct raw_hashinfo raw_v6_hashinfo;
+EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
+
+bool raw_v6_match(struct net *net, struct sock *sk, unsigned short num,
+		  const struct in6_addr *loc_addr,
+		  const struct in6_addr *rmt_addr, int dif, int sdif)
+{
+	if (inet_sk(sk)->inet_num != num ||
+	    !net_eq(sock_net(sk), net) ||
+	    (!ipv6_addr_any(&sk->sk_v6_daddr) &&
+	     !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
+	    !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
+				 dif, sdif))
+		return false;
+
+	if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
+	    ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) ||
+	    (ipv6_addr_is_multicast(loc_addr) &&
+	     inet6_mc_check(sk, loc_addr, rmt_addr)))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(raw_v6_match);
+
+/*
+ *	0 - deliver
+ *	1 - block
+ */
+static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
+{
+	struct icmp6hdr _hdr;
+	const struct icmp6hdr *hdr;
+
+	/* We require only the four bytes of the ICMPv6 header, not any
+	 * additional bytes of message body in "struct icmp6hdr".
+	 */
+	hdr = skb_header_pointer(skb, skb_transport_offset(skb),
+				 ICMPV6_HDRLEN, &_hdr);
+	if (hdr) {
+		const __u32 *data = &raw6_sk(sk)->filter.data[0];
+		unsigned int type = hdr->icmp6_type;
+
+		return (data[type >> 5] & (1U << (type & 31))) != 0;
+	}
+	return 1;
+}
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
+
+static mh_filter_t __rcu *mh_filter __read_mostly;
+
+int rawv6_mh_filter_register(mh_filter_t filter)
+{
+	rcu_assign_pointer(mh_filter, filter);
+	return 0;
+}
+EXPORT_SYMBOL(rawv6_mh_filter_register);
+
+int rawv6_mh_filter_unregister(mh_filter_t filter)
+{
+	RCU_INIT_POINTER(mh_filter, NULL);
+	synchronize_rcu();
+	return 0;
+}
+EXPORT_SYMBOL(rawv6_mh_filter_unregister);
+
+#endif
+
+/*
+ *	demultiplex raw sockets.
+ *	(should consider queueing the skb in the sock receive_queue
+ *	without calling rawv6.c)
+ *
+ *	Caller owns SKB so we must make clones.
+ */
+static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
+{
+	struct net *net = dev_net(skb->dev);
+	const struct in6_addr *saddr;
+	const struct in6_addr *daddr;
+	struct hlist_head *hlist;
+	struct sock *sk;
+	bool delivered = false;
+	__u8 hash;
+
+	saddr = &ipv6_hdr(skb)->saddr;
+	daddr = saddr + 1;
+
+	hash = raw_hashfunc(net, nexthdr);
+	hlist = &raw_v6_hashinfo.ht[hash];
+	rcu_read_lock();
+	sk_for_each_rcu(sk, hlist) {
+		int filtered;
+
+		if (!raw_v6_match(net, sk, nexthdr, daddr, saddr,
+				  inet6_iif(skb), inet6_sdif(skb)))
+			continue;
+		delivered = true;
+		switch (nexthdr) {
+		case IPPROTO_ICMPV6:
+			filtered = icmpv6_filter(sk, skb);
+			break;
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+		case IPPROTO_MH:
+		{
+			/* XXX: To validate MH only once for each packet,
+			 * this is placed here. It should be after checking
+			 * xfrm policy, however it doesn't. The checking xfrm
+			 * policy is placed in rawv6_rcv() because it is
+			 * required for each socket.
+			 */
+			mh_filter_t *filter;
+
+			filter = rcu_dereference(mh_filter);
+			filtered = filter ? (*filter)(sk, skb) : 0;
+			break;
+		}
+#endif
+		default:
+			filtered = 0;
+			break;
+		}
+
+		if (filtered < 0)
+			break;
+		if (filtered == 0) {
+			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
+
+			/* Not releasing hash table! */
+			if (clone)
+				rawv6_rcv(sk, clone);
+		}
+	}
+	rcu_read_unlock();
+	return delivered;
+}
+
+bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
+{
+	return ipv6_raw_deliver(skb, nexthdr);
+}
+
+/* This cleans up af_inet6 a bit. -DaveM */
+static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
+	__be32 v4addr = 0;
+	int addr_type;
+	int err;
+
+	if (addr_len < SIN6_LEN_RFC2133)
+		return -EINVAL;
+
+	if (addr->sin6_family != AF_INET6)
+		return -EINVAL;
+
+	addr_type = ipv6_addr_type(&addr->sin6_addr);
+
+	/* Raw sockets are IPv6 only */
+	if (addr_type == IPV6_ADDR_MAPPED)
+		return -EADDRNOTAVAIL;
+
+	lock_sock(sk);
+
+	err = -EINVAL;
+	if (sk->sk_state != TCP_CLOSE)
+		goto out;
+
+	rcu_read_lock();
+	/* Check if the address belongs to the host. */
+	if (addr_type != IPV6_ADDR_ANY) {
+		struct net_device *dev = NULL;
+
+		if (__ipv6_addr_needs_scope_id(addr_type)) {
+			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)
+				goto out_unlock;
+		}
+
+		if (sk->sk_bound_dev_if) {
+			err = -ENODEV;
+			dev = dev_get_by_index_rcu(sock_net(sk),
+						   sk->sk_bound_dev_if);
+			if (!dev)
+				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) &&
+		    !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
+			err = -EADDRNOTAVAIL;
+			if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
+					   dev, 0)) {
+				goto out_unlock;
+			}
+		}
+	}
+
+	inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
+	sk->sk_v6_rcv_saddr = addr->sin6_addr;
+	if (!(addr_type & IPV6_ADDR_MULTICAST))
+		np->saddr = addr->sin6_addr;
+	err = 0;
+out_unlock:
+	rcu_read_unlock();
+out:
+	release_sock(sk);
+	return err;
+}
+
+static void rawv6_err(struct sock *sk, struct sk_buff *skb,
+	       struct inet6_skb_parm *opt,
+	       u8 type, u8 code, int offset, __be32 info)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	int err;
+	int harderr;
+
+	/* Report error on raw socket, if:
+	   1. User requested recverr.
+	   2. Socket is connected (otherwise the error indication
+	      is useless without recverr and error is hard.
+	 */
+	if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
+		return;
+
+	harderr = icmpv6_err_convert(type, code, &err);
+	if (type == ICMPV6_PKT_TOOBIG) {
+		ip6_sk_update_pmtu(skb, sk, info);
+		harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
+	}
+	if (type == NDISC_REDIRECT) {
+		ip6_sk_redirect(skb, sk);
+		return;
+	}
+	if (np->recverr) {
+		u8 *payload = skb->data;
+		if (!inet->hdrincl)
+			payload += offset;
+		ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
+	}
+
+	if (np->recverr || harderr) {
+		sk->sk_err = err;
+		sk_error_report(sk);
+	}
+}
+
+void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
+		u8 type, u8 code, int inner_offset, __be32 info)
+{
+	struct net *net = dev_net(skb->dev);
+	struct hlist_head *hlist;
+	struct sock *sk;
+	int hash;
+
+	hash = raw_hashfunc(net, nexthdr);
+	hlist = &raw_v6_hashinfo.ht[hash];
+	rcu_read_lock();
+	sk_for_each_rcu(sk, hlist) {
+		/* Note: ipv6_hdr(skb) != skb->data */
+		const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
+
+		if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
+				  inet6_iif(skb), inet6_iif(skb)))
+			continue;
+		rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
+	}
+	rcu_read_unlock();
+}
+
+static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+	if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
+	    skb_checksum_complete(skb)) {
+		atomic_inc(&sk->sk_drops);
+		kfree_skb(skb);
+		return NET_RX_DROP;
+	}
+
+	/* Charge it to the socket. */
+	skb_dst_drop(skb);
+	if (sock_queue_rcv_skb(sk, skb) < 0) {
+		kfree_skb(skb);
+		return NET_RX_DROP;
+	}
+
+	return 0;
+}
+
+/*
+ *	This is next to useless...
+ *	if we demultiplex in network layer we don't need the extra call
+ *	just to queue the skb...
+ *	maybe we could have the network decide upon a hint if it
+ *	should call raw_rcv for demultiplexing
+ */
+int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
+{
+	struct inet_sock *inet = inet_sk(sk);
+	struct raw6_sock *rp = raw6_sk(sk);
+
+	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
+		atomic_inc(&sk->sk_drops);
+		kfree_skb(skb);
+		return NET_RX_DROP;
+	}
+	nf_reset_ct(skb);
+
+	if (!rp->checksum)
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+	if (skb->ip_summed == CHECKSUM_COMPLETE) {
+		skb_postpull_rcsum(skb, skb_network_header(skb),
+				   skb_network_header_len(skb));
+		if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+				     &ipv6_hdr(skb)->daddr,
+				     skb->len, inet->inet_num, skb->csum))
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+	if (!skb_csum_unnecessary(skb))
+		skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
+							 &ipv6_hdr(skb)->daddr,
+							 skb->len,
+							 inet->inet_num, 0));
+
+	if (inet->hdrincl) {
+		if (skb_checksum_complete(skb)) {
+			atomic_inc(&sk->sk_drops);
+			kfree_skb(skb);
+			return NET_RX_DROP;
+		}
+	}
+
+	rawv6_rcv_skb(sk, skb);
+	return 0;
+}
+
+
+/*
+ *	This should be easy, if there is something there
+ *	we return it, otherwise we block.
+ */
+
+static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
+			 int flags, int *addr_len)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
+	struct sk_buff *skb;
+	size_t copied;
+	int err;
+
+	if (flags & MSG_OOB)
+		return -EOPNOTSUPP;
+
+	if (flags & MSG_ERRQUEUE)
+		return ipv6_recv_error(sk, msg, len, addr_len);
+
+	if (np->rxpmtu && np->rxopt.bits.rxpmtu)
+		return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
+
+	skb = skb_recv_datagram(sk, flags, &err);
+	if (!skb)
+		goto out;
+
+	copied = skb->len;
+	if (copied > len) {
+		copied = len;
+		msg->msg_flags |= MSG_TRUNC;
+	}
+
+	if (skb_csum_unnecessary(skb)) {
+		err = skb_copy_datagram_msg(skb, 0, msg, copied);
+	} else if (msg->msg_flags&MSG_TRUNC) {
+		if (__skb_checksum_complete(skb))
+			goto csum_copy_err;
+		err = skb_copy_datagram_msg(skb, 0, msg, copied);
+	} else {
+		err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
+		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,
+							  inet6_iif(skb));
+		*addr_len = sizeof(*sin6);
+	}
+
+	sock_recv_cmsgs(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 ipv6_txoptions *opt;
+	struct sk_buff *skb;
+	int err = 0;
+	int offset;
+	int len;
+	int total_len;
+	__wsum tmp_csum;
+	__sum16 csum;
+
+	if (!rp->checksum)
+		goto send;
+
+	skb = skb_peek(&sk->sk_write_queue);
+	if (!skb)
+		goto out;
+
+	offset = rp->offset;
+	total_len = inet_sk(sk)->cork.base.length;
+	opt = inet6_sk(sk)->cork.opt;
+	total_len -= opt ? opt->opt_flen : 0;
+
+	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);
+	err = skb_copy_bits(skb, offset, &csum, 2);
+	if (err < 0) {
+		ip6_flush_pending_frames(sk);
+		goto out;
+	}
+
+	/* 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;
+
+	BUG_ON(skb_store_bits(skb, offset, &csum, 2));
+
+send:
+	err = ip6_push_pending_frames(sk);
+out:
+	return err;
+}
+
+static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
+			struct flowi6 *fl6, struct dst_entry **dstp,
+			unsigned int flags, const struct sockcm_cookie *sockc)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct net *net = sock_net(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 (length < sizeof(struct ipv6hdr))
+		return -EINVAL;
+	if (flags&MSG_PROBE)
+		goto out;
+
+	skb = sock_alloc_send_skb(sk,
+				  length + hlen + tlen + 15,
+				  flags & MSG_DONTWAIT, &err);
+	if (!skb)
+		goto error;
+	skb_reserve(skb, hlen);
+
+	skb->protocol = htons(ETH_P_IPV6);
+	skb->priority = READ_ONCE(sk->sk_priority);
+	skb->mark = sockc->mark;
+	skb->tstamp = sockc->transmit_time;
+
+	skb_put(skb, length);
+	skb_reset_network_header(skb);
+	iph = ipv6_hdr(skb);
+
+	skb->ip_summed = CHECKSUM_NONE;
+
+	skb_setup_tx_timestamp(skb, sockc->tsflags);
+
+	if (flags & MSG_CONFIRM)
+		skb_set_dst_pending_confirm(skb, 1);
+
+	skb->transport_header = skb->network_header;
+	err = memcpy_from_msg(iph, msg, length);
+	if (err) {
+		err = -EFAULT;
+		kfree_skb(skb);
+		goto error;
+	}
+
+	skb_dst_set(skb, &rt->dst);
+	*dstp = NULL;
+
+	/* if egress device is enslaved to an L3 master device pass the
+	 * skb to its handler for processing
+	 */
+	skb = l3mdev_ip6_out(sk, skb);
+	if (unlikely(!skb))
+		return 0;
+
+	/* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
+	 * in the error path. Since skb has been freed, the dst could
+	 * have been queued for deletion.
+	 */
+	rcu_read_lock();
+	IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
+	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
+		      NULL, rt->dst.dev, dst_output);
+	if (err > 0)
+		err = net_xmit_errno(err);
+	if (err) {
+		IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+		rcu_read_unlock();
+		goto error_check;
+	}
+	rcu_read_unlock();
+out:
+	return 0;
+
+error:
+	IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
+error_check:
+	if (err == -ENOBUFS && !np->recverr)
+		err = 0;
+	return err;
+}
+
+struct raw6_frag_vec {
+	struct msghdr *msg;
+	int hlen;
+	char c[4];
+};
+
+static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
+{
+	int err = 0;
+	switch (fl6->flowi6_proto) {
+	case IPPROTO_ICMPV6:
+		rfv->hlen = 2;
+		err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
+		if (!err) {
+			fl6->fl6_icmp_type = rfv->c[0];
+			fl6->fl6_icmp_code = rfv->c[1];
+		}
+		break;
+	case IPPROTO_MH:
+		rfv->hlen = 4;
+		err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
+		if (!err)
+			fl6->fl6_mh_type = rfv->c[2];
+	}
+	return err;
+}
+
+static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
+		       struct sk_buff *skb)
+{
+	struct raw6_frag_vec *rfv = from;
+
+	if (offset < rfv->hlen) {
+		int copy = min(rfv->hlen - offset, len);
+
+		if (skb->ip_summed == CHECKSUM_PARTIAL)
+			memcpy(to, rfv->c + offset, copy);
+		else
+			skb->csum = csum_block_add(
+				skb->csum,
+				csum_partial_copy_nocheck(rfv->c + offset,
+							  to, copy),
+				odd);
+
+		odd = 0;
+		offset += copy;
+		to += copy;
+		len -= copy;
+
+		if (!len)
+			return 0;
+	}
+
+	offset -= rfv->hlen;
+
+	return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
+}
+
+static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
+{
+	struct ipv6_txoptions *opt_to_free = NULL;
+	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 raw6_frag_vec rfv;
+	struct flowi6 fl6;
+	struct ipcm6_cookie ipc6;
+	int addr_len = msg->msg_namelen;
+	int hdrincl;
+	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;
+
+	/* hdrincl should be READ_ONCE(inet->hdrincl)
+	 * but READ_ONCE() doesn't work with bit fields.
+	 * Doing this indirectly yields the same result.
+	 */
+	hdrincl = inet->hdrincl;
+	hdrincl = READ_ONCE(hdrincl);
+
+	/*
+	 *	Get and verify the address.
+	 */
+	memset(&fl6, 0, sizeof(fl6));
+
+	fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
+	fl6.flowi6_uid = sk->sk_uid;
+
+	ipcm6_init(&ipc6);
+	ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags);
+	ipc6.sockc.mark = fl6.flowi6_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 &&
+			 inet->inet_num != IPPROTO_RAW)
+			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 (IS_ERR(flowlabel))
+					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);
+		ipc6.opt = opt;
+
+		err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
+		if (err < 0) {
+			fl6_sock_release(flowlabel);
+			return err;
+		}
+		if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
+			flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
+			if (IS_ERR(flowlabel))
+				return -EINVAL;
+		}
+		if (!(opt->opt_nflen|opt->opt_flen))
+			opt = NULL;
+	}
+	if (!opt) {
+		opt = txopt_get(np);
+		opt_to_free = opt;
+	}
+	if (flowlabel)
+		opt = fl6_merge_options(&opt_space, flowlabel, opt);
+	opt = ipv6_fixup_options(&opt_space, opt);
+
+	fl6.flowi6_proto = proto;
+	fl6.flowi6_mark = ipc6.sockc.mark;
+
+	if (!hdrincl) {
+		rfv.msg = msg;
+		rfv.hlen = 0;
+		err = rawv6_probe_proto_opt(&rfv, &fl6);
+		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_common(&fl6));
+
+	if (hdrincl)
+		fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
+
+	if (ipc6.tclass < 0)
+		ipc6.tclass = np->tclass;
+
+	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
+
+	dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
+	if (IS_ERR(dst)) {
+		err = PTR_ERR(dst);
+		goto out;
+	}
+	if (ipc6.hlimit < 0)
+		ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
+
+	if (ipc6.dontfrag < 0)
+		ipc6.dontfrag = np->dontfrag;
+
+	if (msg->msg_flags&MSG_CONFIRM)
+		goto do_confirm;
+
+back_from_confirm:
+	if (hdrincl)
+		err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
+					msg->msg_flags, &ipc6.sockc);
+	else {
+		ipc6.opt = opt;
+		lock_sock(sk);
+		err = ip6_append_data(sk, raw6_getfrag, &rfv,
+			len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
+			msg->msg_flags);
+
+		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);
+	txopt_put(opt_to_free);
+	return err < 0 ? err : len;
+do_confirm:
+	if (msg->msg_flags & MSG_PROBE)
+		dst_confirm_neigh(dst, &fl6.daddr);
+	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,
+			       sockptr_t optval, int optlen)
+{
+	switch (optname) {
+	case ICMPV6_FILTER:
+		if (optlen > sizeof(struct icmp6_filter))
+			optlen = sizeof(struct icmp6_filter);
+		if (copy_from_sockptr(&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,
+			       sockptr_t optval, unsigned int optlen)
+{
+	struct raw6_sock *rp = raw6_sk(sk);
+	int val;
+
+	if (optlen < sizeof(val))
+		return -EINVAL;
+
+	if (copy_from_sockptr(&val, optval, sizeof(val)))
+		return -EFAULT;
+
+	switch (optname) {
+	case IPV6_HDRINCL:
+		if (sk->sk_type != SOCK_RAW)
+			return -EINVAL;
+		inet_sk(sk)->hdrincl = !!val;
+		return 0;
+	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,
+			    sockptr_t 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 ||
+		    optname == IPV6_HDRINCL)
+			break;
+		fallthrough;
+	default:
+		return ipv6_setsockopt(sk, level, optname, optval, optlen);
+	}
+
+	return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
+}
+
+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_HDRINCL:
+		val = inet_sk(sk)->hdrincl;
+		break;
+	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 ||
+		    optname == IPV6_HDRINCL)
+			break;
+		fallthrough;
+	default:
+		return ipv6_getsockopt(sk, level, optname, optval, optlen);
+	}
+
+	return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
+}
+
+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)
+			amount = skb->len;
+		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);
+}
+
+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),
+	.useroffset	   = offsetof(struct raw6_sock, filter),
+	.usersize	   = sizeof_field(struct raw6_sock, filter),
+	.h.raw_hash	   = &raw_v6_hashinfo,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	   = compat_rawv6_ioctl,
+#endif
+	.diag_destroy	   = raw_abort,
+};
+
+#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 __net_init raw6_init_net(struct net *net)
+{
+	if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
+			sizeof(struct raw_iter_state), &raw_v6_hashinfo))
+		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.  */
+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  */
+	.gettstamp	   = sock_gettstamp,
+	.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_ioctl	   = inet6_compat_ioctl,
+#endif
+};
+
+static struct inet_protosw rawv6_protosw = {
+	.type		= SOCK_RAW,
+	.protocol	= IPPROTO_IP,	/* wild card */
+	.prot		= &rawv6_prot,
+	.ops		= &inet6_sockraw_ops,
+	.flags		= INET_PROTOSW_REUSE,
+};
+
+int __init rawv6_init(void)
+{
+	return inet6_register_protosw(&rawv6_protosw);
+}
+
+void rawv6_exit(void)
+{
+	inet6_unregister_protosw(&rawv6_protosw);
+}