netfilter: drop bridge nf reset from nf_reset

commit 174e238 ("sk_buff: drop all skb extensions on free and skb scrubbing") made napi recycle always drop skb extensions. The additional skb_ext_del() that is performed via nf_reset on napi skb recycle is not needed anymore. Most nf_reset() calls in the stack are there so queued skb won't block 'rmmod nf_conntrack' indefinitely. This removes the skb_ext_del from nf_reset, and renames it to a more fitting nf_reset_ct(). In a few selected places, add a call to skb_ext_reset to make sure that no active extensions remain. I am submitting this for "net", because we're still early in the release cycle. The patch applies to net-next too, but I think the rename causes needless divergence between those trees. Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
torvalds · Oct 1, 2019 · 895b5c9 · 895b5c9
1 parent 9cfc370
commit 895b5c9
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Showing 31 changed files with 40 additions and 45 deletions.
diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c
@@ -238,7 +238,7 @@ static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
 	skb_dst_drop(skb);
 	skb_dst_set(skb, &rt->dst);
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	skb->ip_summed = CHECKSUM_NONE;
 	ip_select_ident(net, skb, NULL);
@@ -358,7 +358,7 @@ static int pptp_rcv(struct sk_buff *skb)
 	po = lookup_chan(htons(header->call_id), iph->saddr);
 	if (po) {
 		skb_dst_drop(skb);
-		nf_reset(skb);
+		nf_reset_ct(skb);
 		return sk_receive_skb(sk_pppox(po), skb, 0);
 	}
 drop:

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
@@ -1104,7 +1104,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
 	 */
 	skb_orphan(skb);
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	if (ptr_ring_produce(&tfile->tx_ring, skb))
 		goto drop;

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
@@ -1585,7 +1585,7 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
 	/* Don't wait up for transmitted skbs to be freed. */
 	if (!use_napi) {
 		skb_orphan(skb);
-		nf_reset(skb);
+		nf_reset_ct(skb);
 	}
 
 	/* If running out of space, stop queue to avoid getting packets that we

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
@@ -366,7 +366,7 @@ static int vrf_finish_output6(struct net *net, struct sock *sk,
 	struct neighbour *neigh;
 	int ret;
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	skb->protocol = htons(ETH_P_IPV6);
 	skb->dev = dev;
@@ -459,7 +459,7 @@ static struct sk_buff *vrf_ip6_out_direct(struct net_device *vrf_dev,
 
 	/* reset skb device */
 	if (likely(err == 1))
-		nf_reset(skb);
+		nf_reset_ct(skb);
 	else
 		skb = NULL;
 
@@ -560,7 +560,7 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
 	bool is_v6gw = false;
 	int ret = -EINVAL;
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	/* Be paranoid, rather than too clever. */
 	if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
@@ -670,7 +670,7 @@ static struct sk_buff *vrf_ip_out_direct(struct net_device *vrf_dev,
 
 	/* reset skb device */
 	if (likely(err == 1))
-		nf_reset(skb);
+		nf_reset_ct(skb);
 	else
 		skb = NULL;
 

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
@@ -1261,8 +1261,8 @@ static bool mac80211_hwsim_tx_frame_no_nl(struct ieee80211_hw *hw,
 	skb_orphan(skb);
 	skb_dst_drop(skb);
 	skb->mark = 0;
-	secpath_reset(skb);
-	nf_reset(skb);
+	skb_ext_reset(skb);
+	nf_reset_ct(skb);
 
 	/*
 	 * Get absolute mactime here so all HWs RX at the "same time", and

diff --git a/drivers/staging/octeon/ethernet-tx.c b/drivers/staging/octeon/ethernet-tx.c
@@ -349,10 +349,8 @@ int cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
 	 */
 	dst_release(skb_dst(skb));
 	skb_dst_set(skb, NULL);
-#ifdef CONFIG_XFRM
-	secpath_reset(skb);
-#endif
-	nf_reset(skb);
+	skb_ext_reset(skb);
+	nf_reset_ct(skb);
 
 #ifdef CONFIG_NET_SCHED
 	skb->tc_index = 0;

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
@@ -4160,15 +4160,12 @@ static inline void __skb_ext_copy(struct sk_buff *d, const struct sk_buff *s) {}
 static inline void skb_ext_copy(struct sk_buff *dst, const struct sk_buff *s) {}
 #endif /* CONFIG_SKB_EXTENSIONS */
 
-static inline void nf_reset(struct sk_buff *skb)
+static inline void nf_reset_ct(struct sk_buff *skb)
 {
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 	nf_conntrack_put(skb_nfct(skb));
 	skb->_nfct = 0;
 #endif
-#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
-	skb_ext_del(skb, SKB_EXT_BRIDGE_NF);
-#endif
 }
 
 static inline void nf_reset_trace(struct sk_buff *skb)

diff --git a/net/batman-adv/soft-interface.c b/net/batman-adv/soft-interface.c
@@ -436,7 +436,7 @@ void batadv_interface_rx(struct net_device *soft_iface,
 	/* clean the netfilter state now that the batman-adv header has been
 	 * removed
 	 */
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
 		goto dropped;

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
@@ -5120,7 +5120,7 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
 	skb->ignore_df = 0;
 	skb_dst_drop(skb);
 	skb_ext_reset(skb);
-	nf_reset(skb);
+	nf_reset_ct(skb);
 	nf_reset_trace(skb);
 
 #ifdef CONFIG_NET_SWITCHDEV

diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
@@ -871,7 +871,7 @@ static int dccp_v4_rcv(struct sk_buff *skb)
 
 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_and_relse;
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	return __sk_receive_skb(sk, skb, 1, dh->dccph_doff * 4, refcounted);
 

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
@@ -199,7 +199,7 @@ void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int protocol)
 				kfree_skb(skb);
 				return;
 			}
-			nf_reset(skb);
+			nf_reset_ct(skb);
 		}
 		ret = INDIRECT_CALL_2(ipprot->handler, tcp_v4_rcv, udp_rcv,
 				      skb);

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
@@ -1794,7 +1794,7 @@ static void ip_encap(struct net *net, struct sk_buff *skb,
 	ip_send_check(iph);
 
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
-	nf_reset(skb);
+	nf_reset_ct(skb);
 }
 
 static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
@@ -2140,7 +2140,7 @@ int ip_mr_input(struct sk_buff *skb)
 
 			mroute_sk = rcu_dereference(mrt->mroute_sk);
 			if (mroute_sk) {
-				nf_reset(skb);
+				nf_reset_ct(skb);
 				raw_rcv(mroute_sk, skb);
 				return 0;
 			}

diff --git a/net/ipv4/netfilter/nf_dup_ipv4.c b/net/ipv4/netfilter/nf_dup_ipv4.c
@@ -65,7 +65,7 @@ void nf_dup_ipv4(struct net *net, struct sk_buff *skb, unsigned int hooknum,
 
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 	/* Avoid counting cloned packets towards the original connection. */
-	nf_reset(skb);
+	nf_reset_ct(skb);
 	nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 #endif
 	/*

diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
@@ -332,7 +332,7 @@ int raw_rcv(struct sock *sk, struct sk_buff *skb)
 		kfree_skb(skb);
 		return NET_RX_DROP;
 	}
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	skb_push(skb, skb->data - skb_network_header(skb));
 

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
@@ -1916,7 +1916,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
 	if (tcp_v4_inbound_md5_hash(sk, skb))
 		goto discard_and_relse;
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	if (tcp_filter(sk, skb))
 		goto discard_and_relse;

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
@@ -1969,7 +1969,7 @@ static int udp_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
 	 */
 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto drop;
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	if (static_branch_unlikely(&udp_encap_needed_key) && up->encap_type) {
 		int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
@@ -2298,7 +2298,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
 
 	if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
 		goto drop;
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	/* No socket. Drop packet silently, if checksum is wrong */
 	if (udp_lib_checksum_complete(skb))

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
@@ -371,7 +371,7 @@ void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
 			/* Free reference early: we don't need it any more,
 			   and it may hold ip_conntrack module loaded
 			   indefinitely. */
-			nf_reset(skb);
+			nf_reset_ct(skb);
 
 			skb_postpull_rcsum(skb, skb_network_header(skb),
 					   skb_network_header_len(skb));

diff --git a/net/ipv6/netfilter/nf_dup_ipv6.c b/net/ipv6/netfilter/nf_dup_ipv6.c
@@ -54,7 +54,7 @@ void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum,
 		return;
 
 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
-	nf_reset(skb);
+	nf_reset_ct(skb);
 	nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
 #endif
 	if (hooknum == NF_INET_PRE_ROUTING ||

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
@@ -215,7 +215,7 @@ static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 
 			/* Not releasing hash table! */
 			if (clone) {
-				nf_reset(clone);
+				nf_reset_ct(clone);
 				rawv6_rcv(sk, clone);
 			}
 		}

diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
@@ -1078,7 +1078,7 @@ int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len
 	memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
 	IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
 			      IPSKB_REROUTED);
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	bh_lock_sock(sk);
 	if (sock_owned_by_user(sk)) {

diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
@@ -151,7 +151,7 @@ static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb,
 	skb->ip_summed = CHECKSUM_NONE;
 
 	skb_dst_drop(skb);
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	rcu_read_lock();
 	dev = rcu_dereference(spriv->dev);

diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
@@ -193,7 +193,7 @@ static int l2tp_ip_recv(struct sk_buff *skb)
 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_put;
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	return sk_receive_skb(sk, skb, 1);
 

diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
@@ -206,7 +206,7 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
 	if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
 		goto discard_put;
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	return sk_receive_skb(sk, skb, 1);
 

diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -613,7 +613,7 @@ static inline int ip_vs_tunnel_xmit_prepare(struct sk_buff *skb,
 	if (unlikely(cp->flags & IP_VS_CONN_F_NFCT))
 		ret = ip_vs_confirm_conntrack(skb);
 	if (ret == NF_ACCEPT) {
-		nf_reset(skb);
+		nf_reset_ct(skb);
 		skb_forward_csum(skb);
 	}
 	return ret;

diff --git a/net/openvswitch/vport-internal_dev.c b/net/openvswitch/vport-internal_dev.c
@@ -237,7 +237,7 @@ static netdev_tx_t internal_dev_recv(struct sk_buff *skb)
 	}
 
 	skb_dst_drop(skb);
-	nf_reset(skb);
+	nf_reset_ct(skb);
 	secpath_reset(skb);
 
 	skb->pkt_type = PACKET_HOST;

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
@@ -1821,7 +1821,7 @@ static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
 	skb_dst_drop(skb);
 
 	/* drop conntrack reference */
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	spkt = &PACKET_SKB_CB(skb)->sa.pkt;
 
@@ -2121,7 +2121,7 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
 	skb_dst_drop(skb);
 
 	/* drop conntrack reference */
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	spin_lock(&sk->sk_receive_queue.lock);
 	po->stats.stats1.tp_packets++;

diff --git a/net/sctp/input.c b/net/sctp/input.c
@@ -201,7 +201,7 @@ int sctp_rcv(struct sk_buff *skb)
 
 	if (!xfrm_policy_check(sk, XFRM_POLICY_IN, skb, family))
 		goto discard_release;
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	if (sk_filter(sk, skb))
 		goto discard_release;

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
@@ -706,7 +706,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
 	if (err)
 		goto drop;
 
-	nf_reset(skb);
+	nf_reset_ct(skb);
 
 	if (decaps) {
 		sp = skb_sec_path(skb);

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
@@ -185,7 +185,7 @@ static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet)
 	skb->skb_iif = 0;
 	skb->ignore_df = 0;
 	skb_dst_drop(skb);
-	nf_reset(skb);
+	nf_reset_ct(skb);
 	nf_reset_trace(skb);
 
 	if (!xnet)

diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
@@ -502,7 +502,7 @@ int xfrm_output_resume(struct sk_buff *skb, int err)
 	struct net *net = xs_net(skb_dst(skb)->xfrm);
 
 	while (likely((err = xfrm_output_one(skb, err)) == 0)) {
-		nf_reset(skb);
+		nf_reset_ct(skb);
 
 		err = skb_dst(skb)->ops->local_out(net, skb->sk, skb);
 		if (unlikely(err != 1))

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
@@ -2808,7 +2808,7 @@ static void xfrm_policy_queue_process(struct timer_list *t)
 			continue;
 		}
 
-		nf_reset(skb);
+		nf_reset_ct(skb);
 		skb_dst_drop(skb);
 		skb_dst_set(skb, dst);