1 files changed, 20 insertions, 4 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 5585e3a94f3c..c67d634dccd4 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -130,7 +130,7 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *
 	if (lwtunnel_xmit_redirect(dst->lwtstate)) {
 		int res = lwtunnel_xmit(skb);
 
-		if (res < 0 || res == LWTUNNEL_XMIT_DONE)
+		if (res != LWTUNNEL_XMIT_CONTINUE)
 			return res;
 	}
 
@@ -177,7 +177,13 @@ ip6_finish_output_gso_slowpath_drop(struct net *net, struct sock *sk,
 		int err;
 
 		skb_mark_not_on_list(segs);
-		err = ip6_fragment(net, sk, segs, ip6_finish_output2);
+		/* Last GSO segment can be smaller than gso_size (and MTU).
+		 * Adding a fragment header would produce an "atomic fragment",
+		 * which is considered harmful (RFC-8021). Avoid that.
+		 */
+		err = segs->len > mtu ?
+			ip6_fragment(net, sk, segs, ip6_finish_output2) :
+			ip6_finish_output2(net, sk, segs);
 		if (err && ret == 0)
 			ret = err;
 	}
@@ -919,6 +925,9 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 		if (err < 0)
 			goto fail;
 
+		/* We prevent @rt from being freed. */
+		rcu_read_lock();
+
 		for (;;) {
 			/* Prepare header of the next frame,
 			 * before previous one went down. */
@@ -942,6 +951,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 		if (err == 0) {
 			IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
 				      IPSTATS_MIB_FRAGOKS);
+			rcu_read_unlock();
 			return 0;
 		}
 
@@ -949,6 +959,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 
 		IP6_INC_STATS(net, ip6_dst_idev(&rt->dst),
 			      IPSTATS_MIB_FRAGFAILS);
+		rcu_read_unlock();
 		return err;
 
 slow_path_clean:
@@ -1414,7 +1425,7 @@ static int __ip6_append_data(struct sock *sk,
 	mtu = cork->gso_size ? IP6_MAX_MTU : cork->fragsize;
 	orig_mtu = mtu;
 
-	if (cork->tx_flags & SKBTX_ANY_SW_TSTAMP &&
+	if (cork->tx_flags & SKBTX_ANY_TSTAMP &&
 	    sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
 		tskey = sk->sk_tskey++;
 
@@ -1850,8 +1861,13 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
 	IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
 	if (proto == IPPROTO_ICMPV6) {
 		struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
+		u8 icmp6_type;
 
-		ICMP6MSGOUT_INC_STATS(net, idev, icmp6_hdr(skb)->icmp6_type);
+		if (sk->sk_socket->type == SOCK_RAW && !inet_sk(sk)->hdrincl)
+			icmp6_type = fl6->fl6_icmp_type;
+		else
+			icmp6_type = icmp6_hdr(skb)->icmp6_type;
+		ICMP6MSGOUT_INC_STATS(net, idev, icmp6_type);
 		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
 	}