raw: use more conventional iterators

In order to prepare the following patch,
I change raw v4 & v6 code to use more conventional
iterators.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 67 deletions

diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 3b7cbd522b54..c0f2e3475984 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -66,41 +66,27 @@ struct raw_hashinfo raw_v6_hashinfo = {
 };
 EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
 
-struct sock *__raw_v6_lookup(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)
+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)
 {
-	bool is_multicast = ipv6_addr_is_multicast(loc_addr);
-
-	sk_for_each_from(sk)
-		if (inet_sk(sk)->inet_num == num) {
-
-			if (!net_eq(sock_net(sk), net))
-				continue;
-
-			if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
-			    !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
-				continue;
-
-			if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
-						 dif, sdif))
-				continue;
-
-			if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
-				if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
-					goto found;
-				if (is_multicast &&
-				    inet6_mc_check(sk, loc_addr, rmt_addr))
-					goto found;
-				continue;
-			}
-			goto found;
-		}
-	sk = NULL;
-found:
-	return sk;
+	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_lookup);
+EXPORT_SYMBOL_GPL(raw_v6_match);
 
 /*
  *	0 - deliver
@@ -156,31 +142,28 @@ EXPORT_SYMBOL(rawv6_mh_filter_unregister);
  */
 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 *head;
 	struct sock *sk;
 	bool delivered = false;
 	__u8 hash;
-	struct net *net;
 
 	saddr = &ipv6_hdr(skb)->saddr;
 	daddr = saddr + 1;
 
 	hash = nexthdr & (RAW_HTABLE_SIZE - 1);
-
+	head = &raw_v6_hashinfo.ht[hash];
+	if (hlist_empty(head))
+		return false;
 	read_lock(&raw_v6_hashinfo.lock);
-	sk = sk_head(&raw_v6_hashinfo.ht[hash]);
-
-	if (!sk)
-		goto out;
-
-	net = dev_net(skb->dev);
-	sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr,
-			     inet6_iif(skb), inet6_sdif(skb));
-
-	while (sk) {
+	sk_for_each(sk, head) {
 		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:
@@ -219,23 +202,14 @@ static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 				rawv6_rcv(sk, clone);
 			}
 		}
-		sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr,
-				     inet6_iif(skb), inet6_sdif(skb));
 	}
-out:
 	read_unlock(&raw_v6_hashinfo.lock);
 	return delivered;
 }
 
 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
 {
-	struct sock *raw_sk;
-
-	raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]);
-	if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
-		raw_sk = NULL;
-
-	return raw_sk != NULL;
+	return ipv6_raw_deliver(skb, nexthdr);
 }
 
 /* This cleans up af_inet6 a bit. -DaveM */
@@ -361,28 +335,25 @@ static void rawv6_err(struct sock *sk, struct sk_buff *skb,
 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
 		u8 type, u8 code, int inner_offset, __be32 info)
 {
+	const struct in6_addr *saddr, *daddr;
+	struct net *net = dev_net(skb->dev);
+	struct hlist_head *head;
 	struct sock *sk;
 	int hash;
-	const struct in6_addr *saddr, *daddr;
-	struct net *net;
 
 	hash = nexthdr & (RAW_HTABLE_SIZE - 1);
-
+	head = &raw_v6_hashinfo.ht[hash];
 	read_lock(&raw_v6_hashinfo.lock);
-	sk = sk_head(&raw_v6_hashinfo.ht[hash]);
-	if (sk) {
+	sk_for_each(sk, head) {
 		/* Note: ipv6_hdr(skb) != skb->data */
 		const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
 		saddr = &ip6h->saddr;
 		daddr = &ip6h->daddr;
-		net = dev_net(skb->dev);
 
-		while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr,
-					     inet6_iif(skb), inet6_iif(skb)))) {
-			rawv6_err(sk, skb, NULL, type, code,
-					inner_offset, info);
-			sk = sk_next(sk);
-		}
+		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);
 	}
 	read_unlock(&raw_v6_hashinfo.lock);
 }