lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Tue,  2 Apr 2019 19:36:28 -0700
From:   Tom Herbert <tom@...bertland.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     Tom Herbert <tom@...ntonium.net>
Subject: [PATCH net-next 3/3] exthdrs: Rename EH files that are IPv6 specific

Rename extension header files that are specific to IPv6.

net/ipv6/exthdrs.c -> net/ipv6/exthdrs6.c
net/ipv6/exthdrs_offload.c -> net/ipv6/exthdrs6_offload.c
net/ipv6/exthdrs_options.c -> net/ipv6/exthdrs6_options.c
---
 net/ipv6/Makefile           |   6 +-
 net/ipv6/exthdrs.c          | 830 --------------------------------------------
 net/ipv6/exthdrs6.c         | 830 ++++++++++++++++++++++++++++++++++++++++++++
 net/ipv6/exthdrs6_offload.c |  41 +++
 net/ipv6/exthdrs6_options.c | 201 +++++++++++
 net/ipv6/exthdrs_offload.c  |  41 ---
 net/ipv6/exthdrs_options.c  | 201 -----------
 7 files changed, 1075 insertions(+), 1075 deletions(-)
 delete mode 100644 net/ipv6/exthdrs.c
 create mode 100644 net/ipv6/exthdrs6.c
 create mode 100644 net/ipv6/exthdrs6_offload.c
 create mode 100644 net/ipv6/exthdrs6_options.c
 delete mode 100644 net/ipv6/exthdrs_offload.c
 delete mode 100644 net/ipv6/exthdrs_options.c

diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 72bd775..6c0e585 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -9,10 +9,10 @@ ipv6-objs :=	af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
 		addrlabel.o \
 		route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o udplite.o \
 		raw.o icmp.o mcast.o reassembly.o tcp_ipv6.o ping.o \
-		exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o \
-		udp_offload.o seg6.o fib6_notifier.o exthdrs_options.o
+		exthdrs6.o datagram.o ip6_flowlabel.o inet6_connection_sock.o \
+		udp_offload.o seg6.o fib6_notifier.o exthdrs6_options.o
 
-ipv6-offload :=	ip6_offload.o tcpv6_offload.o exthdrs_offload.o
+ipv6-offload :=	ip6_offload.o tcpv6_offload.o exthdrs6_offload.o
 
 ipv6-$(CONFIG_SYSCTL) = sysctl_net_ipv6.o
 ipv6-$(CONFIG_IPV6_MROUTE) += ip6mr.o
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
deleted file mode 100644
index 6dbacf1..0000000
--- a/net/ipv6/exthdrs.c
+++ /dev/null
@@ -1,830 +0,0 @@
-/*
- *	Extension Header handling for IPv6
- *	Linux INET6 implementation
- *
- *	Authors:
- *	Pedro Roque		<roque@...fc.ul.pt>
- *	Andi Kleen		<ak@....de>
- *	Alexey Kuznetsov	<kuznet@....inr.ac.ru>
- *
- *	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.
- */
-
-/* Changes:
- *	yoshfuji		: ensure not to overrun while parsing
- *				  tlv options.
- *	Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs().
- *	YOSHIFUJI Hideaki @USAGI  Register inbound extension header
- *				  handlers as inet6_protocol{}.
- */
-
-#include <linux/errno.h>
-#include <linux/types.h>
-#include <linux/socket.h>
-#include <linux/sockios.h>
-#include <linux/net.h>
-#include <linux/netdevice.h>
-#include <linux/in6.h>
-#include <linux/icmpv6.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-
-#include <net/dst.h>
-#include <net/sock.h>
-#include <net/snmp.h>
-
-#include <net/ipv6.h>
-#include <net/protocol.h>
-#include <net/transp_v6.h>
-#include <net/rawv6.h>
-#include <net/ndisc.h>
-#include <net/ip6_route.h>
-#include <net/addrconf.h>
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-#include <net/xfrm.h>
-#endif
-#include <linux/seg6.h>
-#include <net/seg6.h>
-#ifdef CONFIG_IPV6_SEG6_HMAC
-#include <net/seg6_hmac.h>
-#endif
-
-#include <linux/uaccess.h>
-
-/*********************
-  Generic functions
- *********************/
-
-/* An unknown option is detected, decide what to do */
-
-static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff,
-			       bool disallow_unknowns)
-{
-	if (disallow_unknowns) {
-		/* If unknown TLVs are disallowed by configuration
-		 * then always silently drop packet. Note this also
-		 * means no ICMP parameter problem is sent which
-		 * could be a good property to mitigate a reflection DOS
-		 * attack.
-		 */
-
-		goto drop;
-	}
-
-	switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
-	case 0: /* ignore */
-		return true;
-
-	case 1: /* drop packet */
-		break;
-
-	case 3: /* Send ICMP if not a multicast address and drop packet */
-		/* Actually, it is redundant check. icmp_send
-		   will recheck in any case.
-		 */
-		if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
-			break;
-		/* fall through */
-	case 2: /* send ICMP PARM PROB regardless and drop packet */
-		icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
-		return false;
-	}
-
-drop:
-	kfree_skb(skb);
-	return false;
-}
-
-/* Parse tlv encoded option header (hop-by-hop or destination) */
-
-static bool ip6_parse_tlv(const struct tlvtype_proc *procs,
-			  struct sk_buff *skb,
-			  int max_count)
-{
-	int len = (skb_transport_header(skb)[1] + 1) << 3;
-	const unsigned char *nh = skb_network_header(skb);
-	int off = skb_network_header_len(skb);
-	const struct tlvtype_proc *curr;
-	bool disallow_unknowns = false;
-	int tlv_count = 0;
-	int padlen = 0;
-
-	if (unlikely(max_count < 0)) {
-		disallow_unknowns = true;
-		max_count = -max_count;
-	}
-
-	if (skb_transport_offset(skb) + len > skb_headlen(skb))
-		goto bad;
-
-	off += 2;
-	len -= 2;
-
-	while (len > 0) {
-		int optlen = nh[off + 1] + 2;
-		int i;
-
-		switch (nh[off]) {
-		case IPV6_TLV_PAD1:
-			optlen = 1;
-			padlen++;
-			if (padlen > 7)
-				goto bad;
-			break;
-
-		case IPV6_TLV_PADN:
-			/* RFC 2460 states that the purpose of PadN is
-			 * to align the containing header to multiples
-			 * of 8. 7 is therefore the highest valid value.
-			 * See also RFC 4942, Section 2.1.9.5.
-			 */
-			padlen += optlen;
-			if (padlen > 7)
-				goto bad;
-			/* RFC 4942 recommends receiving hosts to
-			 * actively check PadN payload to contain
-			 * only zeroes.
-			 */
-			for (i = 2; i < optlen; i++) {
-				if (nh[off + i] != 0)
-					goto bad;
-			}
-			break;
-
-		default: /* Other TLV code so scan list */
-			if (optlen > len)
-				goto bad;
-
-			tlv_count++;
-			if (tlv_count > max_count)
-				goto bad;
-
-			for (curr = procs; curr->type >= 0; curr++) {
-				if (curr->type == nh[off]) {
-					/* type specific length/alignment
-					   checks will be performed in the
-					   func(). */
-					if (curr->func(skb, off) == false)
-						return false;
-					break;
-				}
-			}
-			if (curr->type < 0 &&
-			    !ip6_tlvopt_unknown(skb, off, disallow_unknowns))
-				return false;
-
-			padlen = 0;
-			break;
-		}
-		off += optlen;
-		len -= optlen;
-	}
-
-	if (len == 0)
-		return true;
-bad:
-	kfree_skb(skb);
-	return false;
-}
-
-static int ipv6_destopt_rcv(struct sk_buff *skb)
-{
-	struct inet6_dev *idev = __in6_dev_get(skb->dev);
-	struct inet6_skb_parm *opt = IP6CB(skb);
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-	__u16 dstbuf;
-#endif
-	struct dst_entry *dst = skb_dst(skb);
-	struct net *net = dev_net(skb->dev);
-	int extlen;
-
-	if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
-	    !pskb_may_pull(skb, (skb_transport_offset(skb) +
-				 ((skb_transport_header(skb)[1] + 1) << 3)))) {
-		__IP6_INC_STATS(dev_net(dst->dev), idev,
-				IPSTATS_MIB_INHDRERRORS);
-fail_and_free:
-		kfree_skb(skb);
-		return -1;
-	}
-
-	extlen = (skb_transport_header(skb)[1] + 1) << 3;
-	if (extlen > net->ipv6.sysctl.max_dst_opts_len)
-		goto fail_and_free;
-
-	opt->lastopt = opt->dst1 = skb_network_header_len(skb);
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-	dstbuf = opt->dst1;
-#endif
-
-	if (ip6_parse_tlv(tlvprocdestopt_lst, skb,
-			  init_net.ipv6.sysctl.max_dst_opts_cnt)) {
-		skb->transport_header += extlen;
-		opt = IP6CB(skb);
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-		opt->nhoff = dstbuf;
-#else
-		opt->nhoff = opt->dst1;
-#endif
-		return 1;
-	}
-
-	__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-	return -1;
-}
-
-static void seg6_update_csum(struct sk_buff *skb)
-{
-	struct ipv6_sr_hdr *hdr;
-	struct in6_addr *addr;
-	__be32 from, to;
-
-	/* srh is at transport offset and seg_left is already decremented
-	 * but daddr is not yet updated with next segment
-	 */
-
-	hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
-	addr = hdr->segments + hdr->segments_left;
-
-	hdr->segments_left++;
-	from = *(__be32 *)hdr;
-
-	hdr->segments_left--;
-	to = *(__be32 *)hdr;
-
-	/* update skb csum with diff resulting from seg_left decrement */
-
-	update_csum_diff4(skb, from, to);
-
-	/* compute csum diff between current and next segment and update */
-
-	update_csum_diff16(skb, (__be32 *)(&ipv6_hdr(skb)->daddr),
-			   (__be32 *)addr);
-}
-
-static int ipv6_srh_rcv(struct sk_buff *skb)
-{
-	struct inet6_skb_parm *opt = IP6CB(skb);
-	struct net *net = dev_net(skb->dev);
-	struct ipv6_sr_hdr *hdr;
-	struct inet6_dev *idev;
-	struct in6_addr *addr;
-	int accept_seg6;
-
-	hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
-
-	idev = __in6_dev_get(skb->dev);
-
-	accept_seg6 = net->ipv6.devconf_all->seg6_enabled;
-	if (accept_seg6 > idev->cnf.seg6_enabled)
-		accept_seg6 = idev->cnf.seg6_enabled;
-
-	if (!accept_seg6) {
-		kfree_skb(skb);
-		return -1;
-	}
-
-#ifdef CONFIG_IPV6_SEG6_HMAC
-	if (!seg6_hmac_validate_skb(skb)) {
-		kfree_skb(skb);
-		return -1;
-	}
-#endif
-
-looped_back:
-	if (hdr->segments_left == 0) {
-		if (hdr->nexthdr == NEXTHDR_IPV6) {
-			int offset = (hdr->hdrlen + 1) << 3;
-
-			skb_postpull_rcsum(skb, skb_network_header(skb),
-					   skb_network_header_len(skb));
-
-			if (!pskb_pull(skb, offset)) {
-				kfree_skb(skb);
-				return -1;
-			}
-			skb_postpull_rcsum(skb, skb_transport_header(skb),
-					   offset);
-
-			skb_reset_network_header(skb);
-			skb_reset_transport_header(skb);
-			skb->encapsulation = 0;
-
-			__skb_tunnel_rx(skb, skb->dev, net);
-
-			netif_rx(skb);
-			return -1;
-		}
-
-		opt->srcrt = skb_network_header_len(skb);
-		opt->lastopt = opt->srcrt;
-		skb->transport_header += (hdr->hdrlen + 1) << 3;
-		opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
-
-		return 1;
-	}
-
-	if (hdr->segments_left >= (hdr->hdrlen >> 1)) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
-				  ((&hdr->segments_left) -
-				   skb_network_header(skb)));
-		return -1;
-	}
-
-	if (skb_cloned(skb)) {
-		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
-			__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
-					IPSTATS_MIB_OUTDISCARDS);
-			kfree_skb(skb);
-			return -1;
-		}
-	}
-
-	hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
-
-	hdr->segments_left--;
-	addr = hdr->segments + hdr->segments_left;
-
-	skb_push(skb, sizeof(struct ipv6hdr));
-
-	if (skb->ip_summed == CHECKSUM_COMPLETE)
-		seg6_update_csum(skb);
-
-	ipv6_hdr(skb)->daddr = *addr;
-
-	skb_dst_drop(skb);
-
-	ip6_route_input(skb);
-
-	if (skb_dst(skb)->error) {
-		dst_input(skb);
-		return -1;
-	}
-
-	if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
-		if (ipv6_hdr(skb)->hop_limit <= 1) {
-			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-			icmpv6_send(skb, ICMPV6_TIME_EXCEED,
-				    ICMPV6_EXC_HOPLIMIT, 0);
-			kfree_skb(skb);
-			return -1;
-		}
-		ipv6_hdr(skb)->hop_limit--;
-
-		skb_pull(skb, sizeof(struct ipv6hdr));
-		goto looped_back;
-	}
-
-	dst_input(skb);
-
-	return -1;
-}
-
-/********************************
-  Routing header.
- ********************************/
-
-/* called with rcu_read_lock() */
-static int ipv6_rthdr_rcv(struct sk_buff *skb)
-{
-	struct inet6_dev *idev = __in6_dev_get(skb->dev);
-	struct inet6_skb_parm *opt = IP6CB(skb);
-	struct in6_addr *addr = NULL;
-	struct in6_addr daddr;
-	int n, i;
-	struct ipv6_rt_hdr *hdr;
-	struct rt0_hdr *rthdr;
-	struct net *net = dev_net(skb->dev);
-	int accept_source_route = net->ipv6.devconf_all->accept_source_route;
-
-	idev = __in6_dev_get(skb->dev);
-	if (idev && accept_source_route > idev->cnf.accept_source_route)
-		accept_source_route = idev->cnf.accept_source_route;
-
-	if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
-	    !pskb_may_pull(skb, (skb_transport_offset(skb) +
-				 ((skb_transport_header(skb)[1] + 1) << 3)))) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-		kfree_skb(skb);
-		return -1;
-	}
-
-	hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
-
-	if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
-	    skb->pkt_type != PACKET_HOST) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
-		kfree_skb(skb);
-		return -1;
-	}
-
-	/* segment routing */
-	if (hdr->type == IPV6_SRCRT_TYPE_4)
-		return ipv6_srh_rcv(skb);
-
-looped_back:
-	if (hdr->segments_left == 0) {
-		switch (hdr->type) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-		case IPV6_SRCRT_TYPE_2:
-			/* Silently discard type 2 header unless it was
-			 * processed by own
-			 */
-			if (!addr) {
-				__IP6_INC_STATS(net, idev,
-						IPSTATS_MIB_INADDRERRORS);
-				kfree_skb(skb);
-				return -1;
-			}
-			break;
-#endif
-		default:
-			break;
-		}
-
-		opt->lastopt = opt->srcrt = skb_network_header_len(skb);
-		skb->transport_header += (hdr->hdrlen + 1) << 3;
-		opt->dst0 = opt->dst1;
-		opt->dst1 = 0;
-		opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
-		return 1;
-	}
-
-	switch (hdr->type) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-	case IPV6_SRCRT_TYPE_2:
-		if (accept_source_route < 0)
-			goto unknown_rh;
-		/* Silently discard invalid RTH type 2 */
-		if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
-			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-			kfree_skb(skb);
-			return -1;
-		}
-		break;
-#endif
-	default:
-		goto unknown_rh;
-	}
-
-	/*
-	 *	This is the routing header forwarding algorithm from
-	 *	RFC 2460, page 16.
-	 */
-
-	n = hdr->hdrlen >> 1;
-
-	if (hdr->segments_left > n) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
-				  ((&hdr->segments_left) -
-				   skb_network_header(skb)));
-		return -1;
-	}
-
-	/* We are about to mangle packet header. Be careful!
-	   Do not damage packets queued somewhere.
-	 */
-	if (skb_cloned(skb)) {
-		/* the copy is a forwarded packet */
-		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
-			__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
-					IPSTATS_MIB_OUTDISCARDS);
-			kfree_skb(skb);
-			return -1;
-		}
-		hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
-	}
-
-	if (skb->ip_summed == CHECKSUM_COMPLETE)
-		skb->ip_summed = CHECKSUM_NONE;
-
-	i = n - --hdr->segments_left;
-
-	rthdr = (struct rt0_hdr *) hdr;
-	addr = rthdr->addr;
-	addr += i - 1;
-
-	switch (hdr->type) {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-	case IPV6_SRCRT_TYPE_2:
-		if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
-				     (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
-				     IPPROTO_ROUTING) < 0) {
-			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
-			kfree_skb(skb);
-			return -1;
-		}
-		if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
-			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
-			kfree_skb(skb);
-			return -1;
-		}
-		break;
-#endif
-	default:
-		break;
-	}
-
-	if (ipv6_addr_is_multicast(addr)) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
-		kfree_skb(skb);
-		return -1;
-	}
-
-	daddr = *addr;
-	*addr = ipv6_hdr(skb)->daddr;
-	ipv6_hdr(skb)->daddr = daddr;
-
-	skb_dst_drop(skb);
-	ip6_route_input(skb);
-	if (skb_dst(skb)->error) {
-		skb_push(skb, skb->data - skb_network_header(skb));
-		dst_input(skb);
-		return -1;
-	}
-
-	if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
-		if (ipv6_hdr(skb)->hop_limit <= 1) {
-			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-			icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
-				    0);
-			kfree_skb(skb);
-			return -1;
-		}
-		ipv6_hdr(skb)->hop_limit--;
-		goto looped_back;
-	}
-
-	skb_push(skb, skb->data - skb_network_header(skb));
-	dst_input(skb);
-	return -1;
-
-unknown_rh:
-	__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-	icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
-			  (&hdr->type) - skb_network_header(skb));
-	return -1;
-}
-
-static const struct inet6_protocol rthdr_protocol = {
-	.handler	=	ipv6_rthdr_rcv,
-	.flags		=	INET6_PROTO_NOPOLICY,
-};
-
-static const struct inet6_protocol destopt_protocol = {
-	.handler	=	ipv6_destopt_rcv,
-	.flags		=	INET6_PROTO_NOPOLICY,
-};
-
-static const struct inet6_protocol nodata_protocol = {
-	.handler	=	dst_discard,
-	.flags		=	INET6_PROTO_NOPOLICY,
-};
-
-int __init ipv6_exthdrs_init(void)
-{
-	int ret;
-
-	ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING);
-	if (ret)
-		goto out;
-
-	ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
-	if (ret)
-		goto out_rthdr;
-
-	ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE);
-	if (ret)
-		goto out_destopt;
-
-out:
-	return ret;
-out_destopt:
-	inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
-out_rthdr:
-	inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
-	goto out;
-};
-
-void ipv6_exthdrs_exit(void)
-{
-	inet6_del_protocol(&nodata_protocol, IPPROTO_NONE);
-	inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
-	inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
-}
-
-int ipv6_parse_hopopts(struct sk_buff *skb)
-{
-	struct inet6_skb_parm *opt = IP6CB(skb);
-	struct net *net = dev_net(skb->dev);
-	int extlen;
-
-	/*
-	 * skb_network_header(skb) is equal to skb->data, and
-	 * skb_network_header_len(skb) is always equal to
-	 * sizeof(struct ipv6hdr) by definition of
-	 * hop-by-hop options.
-	 */
-	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
-	    !pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
-				 ((skb_transport_header(skb)[1] + 1) << 3)))) {
-fail_and_free:
-		kfree_skb(skb);
-		return -1;
-	}
-
-	extlen = (skb_transport_header(skb)[1] + 1) << 3;
-	if (extlen > net->ipv6.sysctl.max_hbh_opts_len)
-		goto fail_and_free;
-
-	opt->flags |= IP6SKB_HOPBYHOP;
-	if (ip6_parse_tlv(tlvprochopopt_lst, skb,
-			  init_net.ipv6.sysctl.max_hbh_opts_cnt)) {
-		skb->transport_header += extlen;
-		opt = IP6CB(skb);
-		opt->nhoff = sizeof(struct ipv6hdr);
-		return 1;
-	}
-	return -1;
-}
-
-/*
- *	Creating outbound headers.
- *
- *	"build" functions work when skb is filled from head to tail (datagram)
- *	"push"	functions work when headers are added from tail to head (tcp)
- *
- *	In both cases we assume, that caller reserved enough room
- *	for headers.
- */
-
-static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto,
-			     struct ipv6_rt_hdr *opt,
-			     struct in6_addr **addr_p, struct in6_addr *saddr)
-{
-	struct rt0_hdr *phdr, *ihdr;
-	int hops;
-
-	ihdr = (struct rt0_hdr *) opt;
-
-	phdr = skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
-	memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
-
-	hops = ihdr->rt_hdr.hdrlen >> 1;
-
-	if (hops > 1)
-		memcpy(phdr->addr, ihdr->addr + 1,
-		       (hops - 1) * sizeof(struct in6_addr));
-
-	phdr->addr[hops - 1] = **addr_p;
-	*addr_p = ihdr->addr;
-
-	phdr->rt_hdr.nexthdr = *proto;
-	*proto = NEXTHDR_ROUTING;
-}
-
-static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto,
-			     struct ipv6_rt_hdr *opt,
-			     struct in6_addr **addr_p, struct in6_addr *saddr)
-{
-	struct ipv6_sr_hdr *sr_phdr, *sr_ihdr;
-	int plen, hops;
-
-	sr_ihdr = (struct ipv6_sr_hdr *)opt;
-	plen = (sr_ihdr->hdrlen + 1) << 3;
-
-	sr_phdr = skb_push(skb, plen);
-	memcpy(sr_phdr, sr_ihdr, sizeof(struct ipv6_sr_hdr));
-
-	hops = sr_ihdr->first_segment + 1;
-	memcpy(sr_phdr->segments + 1, sr_ihdr->segments + 1,
-	       (hops - 1) * sizeof(struct in6_addr));
-
-	sr_phdr->segments[0] = **addr_p;
-	*addr_p = &sr_ihdr->segments[sr_ihdr->segments_left];
-
-	if (sr_ihdr->hdrlen > hops * 2) {
-		int tlvs_offset, tlvs_length;
-
-		tlvs_offset = (1 + hops * 2) << 3;
-		tlvs_length = (sr_ihdr->hdrlen - hops * 2) << 3;
-		memcpy((char *)sr_phdr + tlvs_offset,
-		       (char *)sr_ihdr + tlvs_offset, tlvs_length);
-	}
-
-#ifdef CONFIG_IPV6_SEG6_HMAC
-	if (sr_has_hmac(sr_phdr)) {
-		struct net *net = NULL;
-
-		if (skb->dev)
-			net = dev_net(skb->dev);
-		else if (skb->sk)
-			net = sock_net(skb->sk);
-
-		WARN_ON(!net);
-
-		if (net)
-			seg6_push_hmac(net, saddr, sr_phdr);
-	}
-#endif
-
-	sr_phdr->nexthdr = *proto;
-	*proto = NEXTHDR_ROUTING;
-}
-
-static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
-			    struct ipv6_rt_hdr *opt,
-			    struct in6_addr **addr_p, struct in6_addr *saddr)
-{
-	switch (opt->type) {
-	case IPV6_SRCRT_TYPE_0:
-	case IPV6_SRCRT_STRICT:
-	case IPV6_SRCRT_TYPE_2:
-		ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr);
-		break;
-	case IPV6_SRCRT_TYPE_4:
-		ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr);
-		break;
-	default:
-		break;
-	}
-}
-
-static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
-{
-	struct ipv6_opt_hdr *h = skb_push(skb, ipv6_optlen(opt));
-
-	memcpy(h, opt, ipv6_optlen(opt));
-	h->nexthdr = *proto;
-	*proto = type;
-}
-
-void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
-			  u8 *proto,
-			  struct in6_addr **daddr, struct in6_addr *saddr)
-{
-	if (opt->srcrt) {
-		ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr);
-		/*
-		 * IPV6_RTHDRDSTOPTS is ignored
-		 * unless IPV6_RTHDR is set (RFC3542).
-		 */
-		if (opt->dst0opt)
-			ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
-	}
-	if (opt->hopopt)
-		ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
-}
-
-void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
-{
-	if (opt->dst1opt)
-		ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
-}
-EXPORT_SYMBOL(ipv6_push_frag_opts);
-
-/**
- * fl6_update_dst - update flowi destination address with info given
- *                  by srcrt option, if any.
- *
- * @fl6: flowi6 for which daddr is to be updated
- * @opt: struct ipv6_txoptions in which to look for srcrt opt
- * @orig: copy of original daddr address if modified
- *
- * Returns NULL if no txoptions or no srcrt, otherwise returns orig
- * and initial value of fl6->daddr set in orig
- */
-struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
-				const struct ipv6_txoptions *opt,
-				struct in6_addr *orig)
-{
-	if (!opt || !opt->srcrt)
-		return NULL;
-
-	*orig = fl6->daddr;
-
-	switch (opt->srcrt->type) {
-	case IPV6_SRCRT_TYPE_0:
-	case IPV6_SRCRT_STRICT:
-	case IPV6_SRCRT_TYPE_2:
-		fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr;
-		break;
-	case IPV6_SRCRT_TYPE_4:
-	{
-		struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)opt->srcrt;
-
-		fl6->daddr = srh->segments[srh->segments_left];
-		break;
-	}
-	default:
-		return NULL;
-	}
-
-	return orig;
-}
-EXPORT_SYMBOL_GPL(fl6_update_dst);
diff --git a/net/ipv6/exthdrs6.c b/net/ipv6/exthdrs6.c
new file mode 100644
index 0000000..6dbacf1
--- /dev/null
+++ b/net/ipv6/exthdrs6.c
@@ -0,0 +1,830 @@
+/*
+ *	Extension Header handling for IPv6
+ *	Linux INET6 implementation
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@...fc.ul.pt>
+ *	Andi Kleen		<ak@....de>
+ *	Alexey Kuznetsov	<kuznet@....inr.ac.ru>
+ *
+ *	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.
+ */
+
+/* Changes:
+ *	yoshfuji		: ensure not to overrun while parsing
+ *				  tlv options.
+ *	Mitsuru KANDA @USAGI and: Remove ipv6_parse_exthdrs().
+ *	YOSHIFUJI Hideaki @USAGI  Register inbound extension header
+ *				  handlers as inet6_protocol{}.
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/in6.h>
+#include <linux/icmpv6.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <net/dst.h>
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/rawv6.h>
+#include <net/ndisc.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+#include <net/xfrm.h>
+#endif
+#include <linux/seg6.h>
+#include <net/seg6.h>
+#ifdef CONFIG_IPV6_SEG6_HMAC
+#include <net/seg6_hmac.h>
+#endif
+
+#include <linux/uaccess.h>
+
+/*********************
+  Generic functions
+ *********************/
+
+/* An unknown option is detected, decide what to do */
+
+static bool ip6_tlvopt_unknown(struct sk_buff *skb, int optoff,
+			       bool disallow_unknowns)
+{
+	if (disallow_unknowns) {
+		/* If unknown TLVs are disallowed by configuration
+		 * then always silently drop packet. Note this also
+		 * means no ICMP parameter problem is sent which
+		 * could be a good property to mitigate a reflection DOS
+		 * attack.
+		 */
+
+		goto drop;
+	}
+
+	switch ((skb_network_header(skb)[optoff] & 0xC0) >> 6) {
+	case 0: /* ignore */
+		return true;
+
+	case 1: /* drop packet */
+		break;
+
+	case 3: /* Send ICMP if not a multicast address and drop packet */
+		/* Actually, it is redundant check. icmp_send
+		   will recheck in any case.
+		 */
+		if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr))
+			break;
+		/* fall through */
+	case 2: /* send ICMP PARM PROB regardless and drop packet */
+		icmpv6_param_prob(skb, ICMPV6_UNK_OPTION, optoff);
+		return false;
+	}
+
+drop:
+	kfree_skb(skb);
+	return false;
+}
+
+/* Parse tlv encoded option header (hop-by-hop or destination) */
+
+static bool ip6_parse_tlv(const struct tlvtype_proc *procs,
+			  struct sk_buff *skb,
+			  int max_count)
+{
+	int len = (skb_transport_header(skb)[1] + 1) << 3;
+	const unsigned char *nh = skb_network_header(skb);
+	int off = skb_network_header_len(skb);
+	const struct tlvtype_proc *curr;
+	bool disallow_unknowns = false;
+	int tlv_count = 0;
+	int padlen = 0;
+
+	if (unlikely(max_count < 0)) {
+		disallow_unknowns = true;
+		max_count = -max_count;
+	}
+
+	if (skb_transport_offset(skb) + len > skb_headlen(skb))
+		goto bad;
+
+	off += 2;
+	len -= 2;
+
+	while (len > 0) {
+		int optlen = nh[off + 1] + 2;
+		int i;
+
+		switch (nh[off]) {
+		case IPV6_TLV_PAD1:
+			optlen = 1;
+			padlen++;
+			if (padlen > 7)
+				goto bad;
+			break;
+
+		case IPV6_TLV_PADN:
+			/* RFC 2460 states that the purpose of PadN is
+			 * to align the containing header to multiples
+			 * of 8. 7 is therefore the highest valid value.
+			 * See also RFC 4942, Section 2.1.9.5.
+			 */
+			padlen += optlen;
+			if (padlen > 7)
+				goto bad;
+			/* RFC 4942 recommends receiving hosts to
+			 * actively check PadN payload to contain
+			 * only zeroes.
+			 */
+			for (i = 2; i < optlen; i++) {
+				if (nh[off + i] != 0)
+					goto bad;
+			}
+			break;
+
+		default: /* Other TLV code so scan list */
+			if (optlen > len)
+				goto bad;
+
+			tlv_count++;
+			if (tlv_count > max_count)
+				goto bad;
+
+			for (curr = procs; curr->type >= 0; curr++) {
+				if (curr->type == nh[off]) {
+					/* type specific length/alignment
+					   checks will be performed in the
+					   func(). */
+					if (curr->func(skb, off) == false)
+						return false;
+					break;
+				}
+			}
+			if (curr->type < 0 &&
+			    !ip6_tlvopt_unknown(skb, off, disallow_unknowns))
+				return false;
+
+			padlen = 0;
+			break;
+		}
+		off += optlen;
+		len -= optlen;
+	}
+
+	if (len == 0)
+		return true;
+bad:
+	kfree_skb(skb);
+	return false;
+}
+
+static int ipv6_destopt_rcv(struct sk_buff *skb)
+{
+	struct inet6_dev *idev = __in6_dev_get(skb->dev);
+	struct inet6_skb_parm *opt = IP6CB(skb);
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+	__u16 dstbuf;
+#endif
+	struct dst_entry *dst = skb_dst(skb);
+	struct net *net = dev_net(skb->dev);
+	int extlen;
+
+	if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+	    !pskb_may_pull(skb, (skb_transport_offset(skb) +
+				 ((skb_transport_header(skb)[1] + 1) << 3)))) {
+		__IP6_INC_STATS(dev_net(dst->dev), idev,
+				IPSTATS_MIB_INHDRERRORS);
+fail_and_free:
+		kfree_skb(skb);
+		return -1;
+	}
+
+	extlen = (skb_transport_header(skb)[1] + 1) << 3;
+	if (extlen > net->ipv6.sysctl.max_dst_opts_len)
+		goto fail_and_free;
+
+	opt->lastopt = opt->dst1 = skb_network_header_len(skb);
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+	dstbuf = opt->dst1;
+#endif
+
+	if (ip6_parse_tlv(tlvprocdestopt_lst, skb,
+			  init_net.ipv6.sysctl.max_dst_opts_cnt)) {
+		skb->transport_header += extlen;
+		opt = IP6CB(skb);
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+		opt->nhoff = dstbuf;
+#else
+		opt->nhoff = opt->dst1;
+#endif
+		return 1;
+	}
+
+	__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+	return -1;
+}
+
+static void seg6_update_csum(struct sk_buff *skb)
+{
+	struct ipv6_sr_hdr *hdr;
+	struct in6_addr *addr;
+	__be32 from, to;
+
+	/* srh is at transport offset and seg_left is already decremented
+	 * but daddr is not yet updated with next segment
+	 */
+
+	hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
+	addr = hdr->segments + hdr->segments_left;
+
+	hdr->segments_left++;
+	from = *(__be32 *)hdr;
+
+	hdr->segments_left--;
+	to = *(__be32 *)hdr;
+
+	/* update skb csum with diff resulting from seg_left decrement */
+
+	update_csum_diff4(skb, from, to);
+
+	/* compute csum diff between current and next segment and update */
+
+	update_csum_diff16(skb, (__be32 *)(&ipv6_hdr(skb)->daddr),
+			   (__be32 *)addr);
+}
+
+static int ipv6_srh_rcv(struct sk_buff *skb)
+{
+	struct inet6_skb_parm *opt = IP6CB(skb);
+	struct net *net = dev_net(skb->dev);
+	struct ipv6_sr_hdr *hdr;
+	struct inet6_dev *idev;
+	struct in6_addr *addr;
+	int accept_seg6;
+
+	hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
+
+	idev = __in6_dev_get(skb->dev);
+
+	accept_seg6 = net->ipv6.devconf_all->seg6_enabled;
+	if (accept_seg6 > idev->cnf.seg6_enabled)
+		accept_seg6 = idev->cnf.seg6_enabled;
+
+	if (!accept_seg6) {
+		kfree_skb(skb);
+		return -1;
+	}
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+	if (!seg6_hmac_validate_skb(skb)) {
+		kfree_skb(skb);
+		return -1;
+	}
+#endif
+
+looped_back:
+	if (hdr->segments_left == 0) {
+		if (hdr->nexthdr == NEXTHDR_IPV6) {
+			int offset = (hdr->hdrlen + 1) << 3;
+
+			skb_postpull_rcsum(skb, skb_network_header(skb),
+					   skb_network_header_len(skb));
+
+			if (!pskb_pull(skb, offset)) {
+				kfree_skb(skb);
+				return -1;
+			}
+			skb_postpull_rcsum(skb, skb_transport_header(skb),
+					   offset);
+
+			skb_reset_network_header(skb);
+			skb_reset_transport_header(skb);
+			skb->encapsulation = 0;
+
+			__skb_tunnel_rx(skb, skb->dev, net);
+
+			netif_rx(skb);
+			return -1;
+		}
+
+		opt->srcrt = skb_network_header_len(skb);
+		opt->lastopt = opt->srcrt;
+		skb->transport_header += (hdr->hdrlen + 1) << 3;
+		opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
+
+		return 1;
+	}
+
+	if (hdr->segments_left >= (hdr->hdrlen >> 1)) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+				  ((&hdr->segments_left) -
+				   skb_network_header(skb)));
+		return -1;
+	}
+
+	if (skb_cloned(skb)) {
+		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
+			__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+					IPSTATS_MIB_OUTDISCARDS);
+			kfree_skb(skb);
+			return -1;
+		}
+	}
+
+	hdr = (struct ipv6_sr_hdr *)skb_transport_header(skb);
+
+	hdr->segments_left--;
+	addr = hdr->segments + hdr->segments_left;
+
+	skb_push(skb, sizeof(struct ipv6hdr));
+
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		seg6_update_csum(skb);
+
+	ipv6_hdr(skb)->daddr = *addr;
+
+	skb_dst_drop(skb);
+
+	ip6_route_input(skb);
+
+	if (skb_dst(skb)->error) {
+		dst_input(skb);
+		return -1;
+	}
+
+	if (skb_dst(skb)->dev->flags & IFF_LOOPBACK) {
+		if (ipv6_hdr(skb)->hop_limit <= 1) {
+			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+			icmpv6_send(skb, ICMPV6_TIME_EXCEED,
+				    ICMPV6_EXC_HOPLIMIT, 0);
+			kfree_skb(skb);
+			return -1;
+		}
+		ipv6_hdr(skb)->hop_limit--;
+
+		skb_pull(skb, sizeof(struct ipv6hdr));
+		goto looped_back;
+	}
+
+	dst_input(skb);
+
+	return -1;
+}
+
+/********************************
+  Routing header.
+ ********************************/
+
+/* called with rcu_read_lock() */
+static int ipv6_rthdr_rcv(struct sk_buff *skb)
+{
+	struct inet6_dev *idev = __in6_dev_get(skb->dev);
+	struct inet6_skb_parm *opt = IP6CB(skb);
+	struct in6_addr *addr = NULL;
+	struct in6_addr daddr;
+	int n, i;
+	struct ipv6_rt_hdr *hdr;
+	struct rt0_hdr *rthdr;
+	struct net *net = dev_net(skb->dev);
+	int accept_source_route = net->ipv6.devconf_all->accept_source_route;
+
+	idev = __in6_dev_get(skb->dev);
+	if (idev && accept_source_route > idev->cnf.accept_source_route)
+		accept_source_route = idev->cnf.accept_source_route;
+
+	if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+	    !pskb_may_pull(skb, (skb_transport_offset(skb) +
+				 ((skb_transport_header(skb)[1] + 1) << 3)))) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+		kfree_skb(skb);
+		return -1;
+	}
+
+	hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
+
+	if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr) ||
+	    skb->pkt_type != PACKET_HOST) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+		kfree_skb(skb);
+		return -1;
+	}
+
+	/* segment routing */
+	if (hdr->type == IPV6_SRCRT_TYPE_4)
+		return ipv6_srh_rcv(skb);
+
+looped_back:
+	if (hdr->segments_left == 0) {
+		switch (hdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+		case IPV6_SRCRT_TYPE_2:
+			/* Silently discard type 2 header unless it was
+			 * processed by own
+			 */
+			if (!addr) {
+				__IP6_INC_STATS(net, idev,
+						IPSTATS_MIB_INADDRERRORS);
+				kfree_skb(skb);
+				return -1;
+			}
+			break;
+#endif
+		default:
+			break;
+		}
+
+		opt->lastopt = opt->srcrt = skb_network_header_len(skb);
+		skb->transport_header += (hdr->hdrlen + 1) << 3;
+		opt->dst0 = opt->dst1;
+		opt->dst1 = 0;
+		opt->nhoff = (&hdr->nexthdr) - skb_network_header(skb);
+		return 1;
+	}
+
+	switch (hdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+	case IPV6_SRCRT_TYPE_2:
+		if (accept_source_route < 0)
+			goto unknown_rh;
+		/* Silently discard invalid RTH type 2 */
+		if (hdr->hdrlen != 2 || hdr->segments_left != 1) {
+			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+			kfree_skb(skb);
+			return -1;
+		}
+		break;
+#endif
+	default:
+		goto unknown_rh;
+	}
+
+	/*
+	 *	This is the routing header forwarding algorithm from
+	 *	RFC 2460, page 16.
+	 */
+
+	n = hdr->hdrlen >> 1;
+
+	if (hdr->segments_left > n) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+				  ((&hdr->segments_left) -
+				   skb_network_header(skb)));
+		return -1;
+	}
+
+	/* We are about to mangle packet header. Be careful!
+	   Do not damage packets queued somewhere.
+	 */
+	if (skb_cloned(skb)) {
+		/* the copy is a forwarded packet */
+		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
+			__IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
+					IPSTATS_MIB_OUTDISCARDS);
+			kfree_skb(skb);
+			return -1;
+		}
+		hdr = (struct ipv6_rt_hdr *)skb_transport_header(skb);
+	}
+
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		skb->ip_summed = CHECKSUM_NONE;
+
+	i = n - --hdr->segments_left;
+
+	rthdr = (struct rt0_hdr *) hdr;
+	addr = rthdr->addr;
+	addr += i - 1;
+
+	switch (hdr->type) {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+	case IPV6_SRCRT_TYPE_2:
+		if (xfrm6_input_addr(skb, (xfrm_address_t *)addr,
+				     (xfrm_address_t *)&ipv6_hdr(skb)->saddr,
+				     IPPROTO_ROUTING) < 0) {
+			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+			kfree_skb(skb);
+			return -1;
+		}
+		if (!ipv6_chk_home_addr(dev_net(skb_dst(skb)->dev), addr)) {
+			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+			kfree_skb(skb);
+			return -1;
+		}
+		break;
+#endif
+	default:
+		break;
+	}
+
+	if (ipv6_addr_is_multicast(addr)) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
+		kfree_skb(skb);
+		return -1;
+	}
+
+	daddr = *addr;
+	*addr = ipv6_hdr(skb)->daddr;
+	ipv6_hdr(skb)->daddr = daddr;
+
+	skb_dst_drop(skb);
+	ip6_route_input(skb);
+	if (skb_dst(skb)->error) {
+		skb_push(skb, skb->data - skb_network_header(skb));
+		dst_input(skb);
+		return -1;
+	}
+
+	if (skb_dst(skb)->dev->flags&IFF_LOOPBACK) {
+		if (ipv6_hdr(skb)->hop_limit <= 1) {
+			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+			icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
+				    0);
+			kfree_skb(skb);
+			return -1;
+		}
+		ipv6_hdr(skb)->hop_limit--;
+		goto looped_back;
+	}
+
+	skb_push(skb, skb->data - skb_network_header(skb));
+	dst_input(skb);
+	return -1;
+
+unknown_rh:
+	__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+	icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+			  (&hdr->type) - skb_network_header(skb));
+	return -1;
+}
+
+static const struct inet6_protocol rthdr_protocol = {
+	.handler	=	ipv6_rthdr_rcv,
+	.flags		=	INET6_PROTO_NOPOLICY,
+};
+
+static const struct inet6_protocol destopt_protocol = {
+	.handler	=	ipv6_destopt_rcv,
+	.flags		=	INET6_PROTO_NOPOLICY,
+};
+
+static const struct inet6_protocol nodata_protocol = {
+	.handler	=	dst_discard,
+	.flags		=	INET6_PROTO_NOPOLICY,
+};
+
+int __init ipv6_exthdrs_init(void)
+{
+	int ret;
+
+	ret = inet6_add_protocol(&rthdr_protocol, IPPROTO_ROUTING);
+	if (ret)
+		goto out;
+
+	ret = inet6_add_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
+	if (ret)
+		goto out_rthdr;
+
+	ret = inet6_add_protocol(&nodata_protocol, IPPROTO_NONE);
+	if (ret)
+		goto out_destopt;
+
+out:
+	return ret;
+out_destopt:
+	inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
+out_rthdr:
+	inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
+	goto out;
+};
+
+void ipv6_exthdrs_exit(void)
+{
+	inet6_del_protocol(&nodata_protocol, IPPROTO_NONE);
+	inet6_del_protocol(&destopt_protocol, IPPROTO_DSTOPTS);
+	inet6_del_protocol(&rthdr_protocol, IPPROTO_ROUTING);
+}
+
+int ipv6_parse_hopopts(struct sk_buff *skb)
+{
+	struct inet6_skb_parm *opt = IP6CB(skb);
+	struct net *net = dev_net(skb->dev);
+	int extlen;
+
+	/*
+	 * skb_network_header(skb) is equal to skb->data, and
+	 * skb_network_header_len(skb) is always equal to
+	 * sizeof(struct ipv6hdr) by definition of
+	 * hop-by-hop options.
+	 */
+	if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + 8) ||
+	    !pskb_may_pull(skb, (sizeof(struct ipv6hdr) +
+				 ((skb_transport_header(skb)[1] + 1) << 3)))) {
+fail_and_free:
+		kfree_skb(skb);
+		return -1;
+	}
+
+	extlen = (skb_transport_header(skb)[1] + 1) << 3;
+	if (extlen > net->ipv6.sysctl.max_hbh_opts_len)
+		goto fail_and_free;
+
+	opt->flags |= IP6SKB_HOPBYHOP;
+	if (ip6_parse_tlv(tlvprochopopt_lst, skb,
+			  init_net.ipv6.sysctl.max_hbh_opts_cnt)) {
+		skb->transport_header += extlen;
+		opt = IP6CB(skb);
+		opt->nhoff = sizeof(struct ipv6hdr);
+		return 1;
+	}
+	return -1;
+}
+
+/*
+ *	Creating outbound headers.
+ *
+ *	"build" functions work when skb is filled from head to tail (datagram)
+ *	"push"	functions work when headers are added from tail to head (tcp)
+ *
+ *	In both cases we assume, that caller reserved enough room
+ *	for headers.
+ */
+
+static void ipv6_push_rthdr0(struct sk_buff *skb, u8 *proto,
+			     struct ipv6_rt_hdr *opt,
+			     struct in6_addr **addr_p, struct in6_addr *saddr)
+{
+	struct rt0_hdr *phdr, *ihdr;
+	int hops;
+
+	ihdr = (struct rt0_hdr *) opt;
+
+	phdr = skb_push(skb, (ihdr->rt_hdr.hdrlen + 1) << 3);
+	memcpy(phdr, ihdr, sizeof(struct rt0_hdr));
+
+	hops = ihdr->rt_hdr.hdrlen >> 1;
+
+	if (hops > 1)
+		memcpy(phdr->addr, ihdr->addr + 1,
+		       (hops - 1) * sizeof(struct in6_addr));
+
+	phdr->addr[hops - 1] = **addr_p;
+	*addr_p = ihdr->addr;
+
+	phdr->rt_hdr.nexthdr = *proto;
+	*proto = NEXTHDR_ROUTING;
+}
+
+static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto,
+			     struct ipv6_rt_hdr *opt,
+			     struct in6_addr **addr_p, struct in6_addr *saddr)
+{
+	struct ipv6_sr_hdr *sr_phdr, *sr_ihdr;
+	int plen, hops;
+
+	sr_ihdr = (struct ipv6_sr_hdr *)opt;
+	plen = (sr_ihdr->hdrlen + 1) << 3;
+
+	sr_phdr = skb_push(skb, plen);
+	memcpy(sr_phdr, sr_ihdr, sizeof(struct ipv6_sr_hdr));
+
+	hops = sr_ihdr->first_segment + 1;
+	memcpy(sr_phdr->segments + 1, sr_ihdr->segments + 1,
+	       (hops - 1) * sizeof(struct in6_addr));
+
+	sr_phdr->segments[0] = **addr_p;
+	*addr_p = &sr_ihdr->segments[sr_ihdr->segments_left];
+
+	if (sr_ihdr->hdrlen > hops * 2) {
+		int tlvs_offset, tlvs_length;
+
+		tlvs_offset = (1 + hops * 2) << 3;
+		tlvs_length = (sr_ihdr->hdrlen - hops * 2) << 3;
+		memcpy((char *)sr_phdr + tlvs_offset,
+		       (char *)sr_ihdr + tlvs_offset, tlvs_length);
+	}
+
+#ifdef CONFIG_IPV6_SEG6_HMAC
+	if (sr_has_hmac(sr_phdr)) {
+		struct net *net = NULL;
+
+		if (skb->dev)
+			net = dev_net(skb->dev);
+		else if (skb->sk)
+			net = sock_net(skb->sk);
+
+		WARN_ON(!net);
+
+		if (net)
+			seg6_push_hmac(net, saddr, sr_phdr);
+	}
+#endif
+
+	sr_phdr->nexthdr = *proto;
+	*proto = NEXTHDR_ROUTING;
+}
+
+static void ipv6_push_rthdr(struct sk_buff *skb, u8 *proto,
+			    struct ipv6_rt_hdr *opt,
+			    struct in6_addr **addr_p, struct in6_addr *saddr)
+{
+	switch (opt->type) {
+	case IPV6_SRCRT_TYPE_0:
+	case IPV6_SRCRT_STRICT:
+	case IPV6_SRCRT_TYPE_2:
+		ipv6_push_rthdr0(skb, proto, opt, addr_p, saddr);
+		break;
+	case IPV6_SRCRT_TYPE_4:
+		ipv6_push_rthdr4(skb, proto, opt, addr_p, saddr);
+		break;
+	default:
+		break;
+	}
+}
+
+static void ipv6_push_exthdr(struct sk_buff *skb, u8 *proto, u8 type, struct ipv6_opt_hdr *opt)
+{
+	struct ipv6_opt_hdr *h = skb_push(skb, ipv6_optlen(opt));
+
+	memcpy(h, opt, ipv6_optlen(opt));
+	h->nexthdr = *proto;
+	*proto = type;
+}
+
+void ipv6_push_nfrag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt,
+			  u8 *proto,
+			  struct in6_addr **daddr, struct in6_addr *saddr)
+{
+	if (opt->srcrt) {
+		ipv6_push_rthdr(skb, proto, opt->srcrt, daddr, saddr);
+		/*
+		 * IPV6_RTHDRDSTOPTS is ignored
+		 * unless IPV6_RTHDR is set (RFC3542).
+		 */
+		if (opt->dst0opt)
+			ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst0opt);
+	}
+	if (opt->hopopt)
+		ipv6_push_exthdr(skb, proto, NEXTHDR_HOP, opt->hopopt);
+}
+
+void ipv6_push_frag_opts(struct sk_buff *skb, struct ipv6_txoptions *opt, u8 *proto)
+{
+	if (opt->dst1opt)
+		ipv6_push_exthdr(skb, proto, NEXTHDR_DEST, opt->dst1opt);
+}
+EXPORT_SYMBOL(ipv6_push_frag_opts);
+
+/**
+ * fl6_update_dst - update flowi destination address with info given
+ *                  by srcrt option, if any.
+ *
+ * @fl6: flowi6 for which daddr is to be updated
+ * @opt: struct ipv6_txoptions in which to look for srcrt opt
+ * @orig: copy of original daddr address if modified
+ *
+ * Returns NULL if no txoptions or no srcrt, otherwise returns orig
+ * and initial value of fl6->daddr set in orig
+ */
+struct in6_addr *fl6_update_dst(struct flowi6 *fl6,
+				const struct ipv6_txoptions *opt,
+				struct in6_addr *orig)
+{
+	if (!opt || !opt->srcrt)
+		return NULL;
+
+	*orig = fl6->daddr;
+
+	switch (opt->srcrt->type) {
+	case IPV6_SRCRT_TYPE_0:
+	case IPV6_SRCRT_STRICT:
+	case IPV6_SRCRT_TYPE_2:
+		fl6->daddr = *((struct rt0_hdr *)opt->srcrt)->addr;
+		break;
+	case IPV6_SRCRT_TYPE_4:
+	{
+		struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)opt->srcrt;
+
+		fl6->daddr = srh->segments[srh->segments_left];
+		break;
+	}
+	default:
+		return NULL;
+	}
+
+	return orig;
+}
+EXPORT_SYMBOL_GPL(fl6_update_dst);
diff --git a/net/ipv6/exthdrs6_offload.c b/net/ipv6/exthdrs6_offload.c
new file mode 100644
index 0000000..f5e2ba1
--- /dev/null
+++ b/net/ipv6/exthdrs6_offload.c
@@ -0,0 +1,41 @@
+/*
+ *	IPV6 GSO/GRO offload support
+ *	Linux INET6 implementation
+ *
+ *	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.
+ *
+ *      IPV6 Extension Header GSO/GRO support
+ */
+#include <net/protocol.h>
+#include "ip6_offload.h"
+
+static const struct net_offload rthdr_offload = {
+	.flags		=	INET6_PROTO_GSO_EXTHDR,
+};
+
+static const struct net_offload dstopt_offload = {
+	.flags		=	INET6_PROTO_GSO_EXTHDR,
+};
+
+int __init ipv6_exthdrs_offload_init(void)
+{
+	int ret;
+
+	ret = inet6_add_offload(&rthdr_offload, IPPROTO_ROUTING);
+	if (ret)
+		goto out;
+
+	ret = inet6_add_offload(&dstopt_offload, IPPROTO_DSTOPTS);
+	if (ret)
+		goto out_rt;
+
+out:
+	return ret;
+
+out_rt:
+	inet6_del_offload(&rthdr_offload, IPPROTO_ROUTING);
+	goto out;
+}
diff --git a/net/ipv6/exthdrs6_options.c b/net/ipv6/exthdrs6_options.c
new file mode 100644
index 0000000..032e072
--- /dev/null
+++ b/net/ipv6/exthdrs6_options.c
@@ -0,0 +1,201 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/errno.h>
+#include <linux/in6.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/socket.h>
+#include <linux/types.h>
+#include <net/calipso.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+#include <net/xfrm.h>
+#endif
+
+/* Destination options header */
+
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+static bool ipv6_dest_hao(struct sk_buff *skb, int optoff)
+{
+	struct ipv6_destopt_hao *hao;
+	struct inet6_skb_parm *opt = IP6CB(skb);
+	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+	int ret;
+
+	if (opt->dsthao) {
+		net_dbg_ratelimited("hao duplicated\n");
+		goto discard;
+	}
+	opt->dsthao = opt->dst1;
+	opt->dst1 = 0;
+
+	hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
+
+	if (hao->length != 16) {
+		net_dbg_ratelimited("hao invalid option length = %d\n",
+				    hao->length);
+		goto discard;
+	}
+
+	if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) {
+		net_dbg_ratelimited("hao is not an unicast addr: %pI6\n",
+				    &hao->addr);
+		goto discard;
+	}
+
+	ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr,
+			       (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS);
+	if (unlikely(ret < 0))
+		goto discard;
+
+	if (skb_cloned(skb)) {
+		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+			goto discard;
+
+		/* update all variable using below by copied skbuff */
+		hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
+						  optoff);
+		ipv6h = ipv6_hdr(skb);
+	}
+
+	if (skb->ip_summed == CHECKSUM_COMPLETE)
+		skb->ip_summed = CHECKSUM_NONE;
+
+	swap(ipv6h->saddr, hao->addr);
+
+	if (skb->tstamp == 0)
+		__net_timestamp(skb);
+
+	return true;
+
+ discard:
+	kfree_skb(skb);
+	return false;
+}
+#endif
+
+const struct tlvtype_proc tlvprocdestopt_lst[] = {
+#if IS_ENABLED(CONFIG_IPV6_MIP6)
+	{
+		.type	= IPV6_TLV_HAO,
+		.func	= ipv6_dest_hao,
+	},
+#endif
+	{-1,			NULL}
+};
+
+/* Hop-by-hop options */
+
+/* Note: we cannot rely on skb_dst(skb) before we assign it in
+ * ip6_route_input().
+ */
+static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
+{
+	return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) :
+	    __in6_dev_get(skb->dev);
+}
+
+static inline struct net *ipv6_skb_net(struct sk_buff *skb)
+{
+	return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev);
+}
+
+/* Router Alert as of RFC 2711 */
+
+static bool ipv6_hop_ra(struct sk_buff *skb, int optoff)
+{
+	const unsigned char *nh = skb_network_header(skb);
+
+	if (nh[optoff + 1] == 2) {
+		IP6CB(skb)->flags |= IP6SKB_ROUTERALERT;
+		memcpy(&IP6CB(skb)->ra, nh + optoff + 2,
+		       sizeof(IP6CB(skb)->ra));
+		return true;
+	}
+	net_dbg_ratelimited("%s: wrong RA length %d\n",
+			    __func__, nh[optoff + 1]);
+	kfree_skb(skb);
+	return false;
+}
+
+/* Jumbo payload */
+
+static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
+{
+	const unsigned char *nh = skb_network_header(skb);
+	struct inet6_dev *idev = __in6_dev_get_safely(skb->dev);
+	struct net *net = ipv6_skb_net(skb);
+	u32 pkt_len;
+
+	if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
+		net_dbg_ratelimited("%s: wrong jumbo opt length/alignment %d\n",
+				    __func__, nh[optoff + 1]);
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+		goto drop;
+	}
+
+	pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
+	if (pkt_len <= IPV6_MAXPLEN) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff + 2);
+		return false;
+	}
+	if (ipv6_hdr(skb)->payload_len) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
+		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
+		return false;
+	}
+
+	if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
+		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INTRUNCATEDPKTS);
+		goto drop;
+	}
+
+	if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
+		goto drop;
+
+	IP6CB(skb)->flags |= IP6SKB_JUMBOGRAM;
+	return true;
+
+drop:
+	kfree_skb(skb);
+	return false;
+}
+
+/* CALIPSO RFC 5570 */
+
+static bool ipv6_hop_calipso(struct sk_buff *skb, int optoff)
+{
+	const unsigned char *nh = skb_network_header(skb);
+
+	if (nh[optoff + 1] < 8)
+		goto drop;
+
+	if (nh[optoff + 6] * 4 + 8 > nh[optoff + 1])
+		goto drop;
+
+	if (!calipso_validate(skb, nh + optoff))
+		goto drop;
+
+	return true;
+
+drop:
+	kfree_skb(skb);
+	return false;
+}
+
+const struct tlvtype_proc tlvprochopopt_lst[] = {
+	{
+		.type	= IPV6_TLV_ROUTERALERT,
+		.func	= ipv6_hop_ra,
+	},
+	{
+		.type	= IPV6_TLV_JUMBO,
+		.func	= ipv6_hop_jumbo,
+	},
+	{
+		.type	= IPV6_TLV_CALIPSO,
+		.func	= ipv6_hop_calipso,
+	},
+	{ -1, }
+};
diff --git a/net/ipv6/exthdrs_offload.c b/net/ipv6/exthdrs_offload.c
deleted file mode 100644
index f5e2ba1..0000000
--- a/net/ipv6/exthdrs_offload.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- *	IPV6 GSO/GRO offload support
- *	Linux INET6 implementation
- *
- *	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.
- *
- *      IPV6 Extension Header GSO/GRO support
- */
-#include <net/protocol.h>
-#include "ip6_offload.h"
-
-static const struct net_offload rthdr_offload = {
-	.flags		=	INET6_PROTO_GSO_EXTHDR,
-};
-
-static const struct net_offload dstopt_offload = {
-	.flags		=	INET6_PROTO_GSO_EXTHDR,
-};
-
-int __init ipv6_exthdrs_offload_init(void)
-{
-	int ret;
-
-	ret = inet6_add_offload(&rthdr_offload, IPPROTO_ROUTING);
-	if (ret)
-		goto out;
-
-	ret = inet6_add_offload(&dstopt_offload, IPPROTO_DSTOPTS);
-	if (ret)
-		goto out_rt;
-
-out:
-	return ret;
-
-out_rt:
-	inet6_del_offload(&rthdr_offload, IPPROTO_ROUTING);
-	goto out;
-}
diff --git a/net/ipv6/exthdrs_options.c b/net/ipv6/exthdrs_options.c
deleted file mode 100644
index 032e072..0000000
--- a/net/ipv6/exthdrs_options.c
+++ /dev/null
@@ -1,201 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/errno.h>
-#include <linux/in6.h>
-#include <linux/net.h>
-#include <linux/netdevice.h>
-#include <linux/socket.h>
-#include <linux/types.h>
-#include <net/calipso.h>
-#include <net/ipv6.h>
-#include <net/ip6_route.h>
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-#include <net/xfrm.h>
-#endif
-
-/* Destination options header */
-
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-static bool ipv6_dest_hao(struct sk_buff *skb, int optoff)
-{
-	struct ipv6_destopt_hao *hao;
-	struct inet6_skb_parm *opt = IP6CB(skb);
-	struct ipv6hdr *ipv6h = ipv6_hdr(skb);
-	int ret;
-
-	if (opt->dsthao) {
-		net_dbg_ratelimited("hao duplicated\n");
-		goto discard;
-	}
-	opt->dsthao = opt->dst1;
-	opt->dst1 = 0;
-
-	hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) + optoff);
-
-	if (hao->length != 16) {
-		net_dbg_ratelimited("hao invalid option length = %d\n",
-				    hao->length);
-		goto discard;
-	}
-
-	if (!(ipv6_addr_type(&hao->addr) & IPV6_ADDR_UNICAST)) {
-		net_dbg_ratelimited("hao is not an unicast addr: %pI6\n",
-				    &hao->addr);
-		goto discard;
-	}
-
-	ret = xfrm6_input_addr(skb, (xfrm_address_t *)&ipv6h->daddr,
-			       (xfrm_address_t *)&hao->addr, IPPROTO_DSTOPTS);
-	if (unlikely(ret < 0))
-		goto discard;
-
-	if (skb_cloned(skb)) {
-		if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
-			goto discard;
-
-		/* update all variable using below by copied skbuff */
-		hao = (struct ipv6_destopt_hao *)(skb_network_header(skb) +
-						  optoff);
-		ipv6h = ipv6_hdr(skb);
-	}
-
-	if (skb->ip_summed == CHECKSUM_COMPLETE)
-		skb->ip_summed = CHECKSUM_NONE;
-
-	swap(ipv6h->saddr, hao->addr);
-
-	if (skb->tstamp == 0)
-		__net_timestamp(skb);
-
-	return true;
-
- discard:
-	kfree_skb(skb);
-	return false;
-}
-#endif
-
-const struct tlvtype_proc tlvprocdestopt_lst[] = {
-#if IS_ENABLED(CONFIG_IPV6_MIP6)
-	{
-		.type	= IPV6_TLV_HAO,
-		.func	= ipv6_dest_hao,
-	},
-#endif
-	{-1,			NULL}
-};
-
-/* Hop-by-hop options */
-
-/* Note: we cannot rely on skb_dst(skb) before we assign it in
- * ip6_route_input().
- */
-static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb)
-{
-	return skb_dst(skb) ? ip6_dst_idev(skb_dst(skb)) :
-	    __in6_dev_get(skb->dev);
-}
-
-static inline struct net *ipv6_skb_net(struct sk_buff *skb)
-{
-	return skb_dst(skb) ? dev_net(skb_dst(skb)->dev) : dev_net(skb->dev);
-}
-
-/* Router Alert as of RFC 2711 */
-
-static bool ipv6_hop_ra(struct sk_buff *skb, int optoff)
-{
-	const unsigned char *nh = skb_network_header(skb);
-
-	if (nh[optoff + 1] == 2) {
-		IP6CB(skb)->flags |= IP6SKB_ROUTERALERT;
-		memcpy(&IP6CB(skb)->ra, nh + optoff + 2,
-		       sizeof(IP6CB(skb)->ra));
-		return true;
-	}
-	net_dbg_ratelimited("%s: wrong RA length %d\n",
-			    __func__, nh[optoff + 1]);
-	kfree_skb(skb);
-	return false;
-}
-
-/* Jumbo payload */
-
-static bool ipv6_hop_jumbo(struct sk_buff *skb, int optoff)
-{
-	const unsigned char *nh = skb_network_header(skb);
-	struct inet6_dev *idev = __in6_dev_get_safely(skb->dev);
-	struct net *net = ipv6_skb_net(skb);
-	u32 pkt_len;
-
-	if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
-		net_dbg_ratelimited("%s: wrong jumbo opt length/alignment %d\n",
-				    __func__, nh[optoff + 1]);
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-		goto drop;
-	}
-
-	pkt_len = ntohl(*(__be32 *)(nh + optoff + 2));
-	if (pkt_len <= IPV6_MAXPLEN) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff + 2);
-		return false;
-	}
-	if (ipv6_hdr(skb)->payload_len) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
-		icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff);
-		return false;
-	}
-
-	if (pkt_len > skb->len - sizeof(struct ipv6hdr)) {
-		__IP6_INC_STATS(net, idev, IPSTATS_MIB_INTRUNCATEDPKTS);
-		goto drop;
-	}
-
-	if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
-		goto drop;
-
-	IP6CB(skb)->flags |= IP6SKB_JUMBOGRAM;
-	return true;
-
-drop:
-	kfree_skb(skb);
-	return false;
-}
-
-/* CALIPSO RFC 5570 */
-
-static bool ipv6_hop_calipso(struct sk_buff *skb, int optoff)
-{
-	const unsigned char *nh = skb_network_header(skb);
-
-	if (nh[optoff + 1] < 8)
-		goto drop;
-
-	if (nh[optoff + 6] * 4 + 8 > nh[optoff + 1])
-		goto drop;
-
-	if (!calipso_validate(skb, nh + optoff))
-		goto drop;
-
-	return true;
-
-drop:
-	kfree_skb(skb);
-	return false;
-}
-
-const struct tlvtype_proc tlvprochopopt_lst[] = {
-	{
-		.type	= IPV6_TLV_ROUTERALERT,
-		.func	= ipv6_hop_ra,
-	},
-	{
-		.type	= IPV6_TLV_JUMBO,
-		.func	= ipv6_hop_jumbo,
-	},
-	{
-		.type	= IPV6_TLV_CALIPSO,
-		.func	= ipv6_hop_calipso,
-	},
-	{ -1, }
-};
-- 
2.7.4

Powered by blists - more mailing lists