Adding upstream version 6.1.76.upstream/6.1.76upstream

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

1 files changed, 273 insertions, 0 deletions

diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
new file mode 100644
index 000000000..857713d7a
--- /dev/null
+++ b/net/ipv6/netfilter.c
@@ -0,0 +1,273 @@
+/*
+ * IPv6 specific functions of netfilter core
+ *
+ * Rusty Russell (C) 2000 -- This code is GPL.
+ * Patrick McHardy (C) 2006-2012
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/ipv6.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/export.h>
+#include <net/addrconf.h>
+#include <net/dst.h>
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <net/xfrm.h>
+#include <net/netfilter/nf_queue.h>
+#include <net/netfilter/nf_conntrack_bridge.h>
+#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
+#include "../bridge/br_private.h"
+
+int ip6_route_me_harder(struct net *net, struct sock *sk_partial, struct sk_buff *skb)
+{
+	const struct ipv6hdr *iph = ipv6_hdr(skb);
+	struct sock *sk = sk_to_full_sk(sk_partial);
+	struct net_device *dev = skb_dst(skb)->dev;
+	struct flow_keys flkeys;
+	unsigned int hh_len;
+	struct dst_entry *dst;
+	int strict = (ipv6_addr_type(&iph->daddr) &
+		      (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL));
+	struct flowi6 fl6 = {
+		.flowi6_l3mdev = l3mdev_master_ifindex(dev),
+		.flowi6_mark = skb->mark,
+		.flowi6_uid = sock_net_uid(net, sk),
+		.daddr = iph->daddr,
+		.saddr = iph->saddr,
+	};
+	int err;
+
+	if (sk && sk->sk_bound_dev_if)
+		fl6.flowi6_oif = sk->sk_bound_dev_if;
+	else if (strict)
+		fl6.flowi6_oif = dev->ifindex;
+
+	fib6_rules_early_flow_dissect(net, skb, &fl6, &flkeys);
+	dst = ip6_route_output(net, sk, &fl6);
+	err = dst->error;
+	if (err) {
+		IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
+		net_dbg_ratelimited("ip6_route_me_harder: No more route\n");
+		dst_release(dst);
+		return err;
+	}
+
+	/* Drop old route. */
+	skb_dst_drop(skb);
+
+	skb_dst_set(skb, dst);
+
+#ifdef CONFIG_XFRM
+	if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+	    xfrm_decode_session(skb, flowi6_to_flowi(&fl6), AF_INET6) == 0) {
+		skb_dst_set(skb, NULL);
+		dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), sk, 0);
+		if (IS_ERR(dst))
+			return PTR_ERR(dst);
+		skb_dst_set(skb, dst);
+	}
+#endif
+
+	/* Change in oif may mean change in hh_len. */
+	hh_len = skb_dst(skb)->dev->hard_header_len;
+	if (skb_headroom(skb) < hh_len &&
+	    pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
+			     0, GFP_ATOMIC))
+		return -ENOMEM;
+
+	return 0;
+}
+EXPORT_SYMBOL(ip6_route_me_harder);
+
+static int nf_ip6_reroute(struct sk_buff *skb,
+			  const struct nf_queue_entry *entry)
+{
+	struct ip6_rt_info *rt_info = nf_queue_entry_reroute(entry);
+
+	if (entry->state.hook == NF_INET_LOCAL_OUT) {
+		const struct ipv6hdr *iph = ipv6_hdr(skb);
+		if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
+		    !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
+		    skb->mark != rt_info->mark)
+			return ip6_route_me_harder(entry->state.net, entry->state.sk, skb);
+	}
+	return 0;
+}
+
+int __nf_ip6_route(struct net *net, struct dst_entry **dst,
+		   struct flowi *fl, bool strict)
+{
+	static const struct ipv6_pinfo fake_pinfo;
+	static const struct inet_sock fake_sk = {
+		/* makes ip6_route_output set RT6_LOOKUP_F_IFACE: */
+		.sk.sk_bound_dev_if = 1,
+		.pinet6 = (struct ipv6_pinfo *) &fake_pinfo,
+	};
+	const void *sk = strict ? &fake_sk : NULL;
+	struct dst_entry *result;
+	int err;
+
+	result = ip6_route_output(net, sk, &fl->u.ip6);
+	err = result->error;
+	if (err)
+		dst_release(result);
+	else
+		*dst = result;
+	return err;
+}
+EXPORT_SYMBOL_GPL(__nf_ip6_route);
+
+int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
+		    struct nf_bridge_frag_data *data,
+		    int (*output)(struct net *, struct sock *sk,
+				  const struct nf_bridge_frag_data *data,
+				  struct sk_buff *))
+{
+	int frag_max_size = BR_INPUT_SKB_CB(skb)->frag_max_size;
+	bool mono_delivery_time = skb->mono_delivery_time;
+	ktime_t tstamp = skb->tstamp;
+	struct ip6_frag_state state;
+	u8 *prevhdr, nexthdr = 0;
+	unsigned int mtu, hlen;
+	int hroom, err = 0;
+	__be32 frag_id;
+
+	err = ip6_find_1stfragopt(skb, &prevhdr);
+	if (err < 0)
+		goto blackhole;
+	hlen = err;
+	nexthdr = *prevhdr;
+
+	mtu = skb->dev->mtu;
+	if (frag_max_size > mtu ||
+	    frag_max_size < IPV6_MIN_MTU)
+		goto blackhole;
+
+	mtu = frag_max_size;
+	if (mtu < hlen + sizeof(struct frag_hdr) + 8)
+		goto blackhole;
+	mtu -= hlen + sizeof(struct frag_hdr);
+
+	frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
+				    &ipv6_hdr(skb)->saddr);
+
+	if (skb->ip_summed == CHECKSUM_PARTIAL &&
+	    (err = skb_checksum_help(skb)))
+		goto blackhole;
+
+	hroom = LL_RESERVED_SPACE(skb->dev);
+	if (skb_has_frag_list(skb)) {
+		unsigned int first_len = skb_pagelen(skb);
+		struct ip6_fraglist_iter iter;
+		struct sk_buff *frag2;
+
+		if (first_len - hlen > mtu ||
+		    skb_headroom(skb) < (hroom + sizeof(struct frag_hdr)))
+			goto blackhole;
+
+		if (skb_cloned(skb))
+			goto slow_path;
+
+		skb_walk_frags(skb, frag2) {
+			if (frag2->len > mtu ||
+			    skb_headroom(frag2) < (hlen + hroom + sizeof(struct frag_hdr)))
+				goto blackhole;
+
+			/* Partially cloned skb? */
+			if (skb_shared(frag2))
+				goto slow_path;
+		}
+
+		err = ip6_fraglist_init(skb, hlen, prevhdr, nexthdr, frag_id,
+					&iter);
+		if (err < 0)
+			goto blackhole;
+
+		for (;;) {
+			/* Prepare header of the next frame,
+			 * before previous one went down.
+			 */
+			if (iter.frag)
+				ip6_fraglist_prepare(skb, &iter);
+
+			skb_set_delivery_time(skb, tstamp, mono_delivery_time);
+			err = output(net, sk, data, skb);
+			if (err || !iter.frag)
+				break;
+
+			skb = ip6_fraglist_next(&iter);
+		}
+
+		kfree(iter.tmp_hdr);
+		if (!err)
+			return 0;
+
+		kfree_skb_list(iter.frag);
+		return err;
+	}
+slow_path:
+	/* This is a linearized skbuff, the original geometry is lost for us.
+	 * This may also be a clone skbuff, we could preserve the geometry for
+	 * the copies but probably not worth the effort.
+	 */
+	ip6_frag_init(skb, hlen, mtu, skb->dev->needed_tailroom,
+		      LL_RESERVED_SPACE(skb->dev), prevhdr, nexthdr, frag_id,
+		      &state);
+
+	while (state.left > 0) {
+		struct sk_buff *skb2;
+
+		skb2 = ip6_frag_next(skb, &state);
+		if (IS_ERR(skb2)) {
+			err = PTR_ERR(skb2);
+			goto blackhole;
+		}
+
+		skb_set_delivery_time(skb2, tstamp, mono_delivery_time);
+		err = output(net, sk, data, skb2);
+		if (err)
+			goto blackhole;
+	}
+	consume_skb(skb);
+	return err;
+
+blackhole:
+	kfree_skb(skb);
+	return 0;
+}
+EXPORT_SYMBOL_GPL(br_ip6_fragment);
+
+static const struct nf_ipv6_ops ipv6ops = {
+#if IS_MODULE(CONFIG_IPV6)
+	.chk_addr		= ipv6_chk_addr,
+	.route_me_harder	= ip6_route_me_harder,
+	.dev_get_saddr		= ipv6_dev_get_saddr,
+	.route			= __nf_ip6_route,
+#if IS_ENABLED(CONFIG_SYN_COOKIES)
+	.cookie_init_sequence	= __cookie_v6_init_sequence,
+	.cookie_v6_check	= __cookie_v6_check,
+#endif
+#endif
+	.route_input		= ip6_route_input,
+	.fragment		= ip6_fragment,
+	.reroute		= nf_ip6_reroute,
+#if IS_MODULE(CONFIG_IPV6)
+	.br_fragment		= br_ip6_fragment,
+#endif
+};
+
+int __init ipv6_netfilter_init(void)
+{
+	RCU_INIT_POINTER(nf_ipv6_ops, &ipv6ops);
+	return 0;
+}
+
+/* This can be called from inet6_init() on errors, so it cannot
+ * be marked __exit. -DaveM
+ */
+void ipv6_netfilter_fini(void)
+{
+	RCU_INIT_POINTER(nf_ipv6_ops, NULL);
+}