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Message-Id: <1405377039-10082-1-git-send-email-drheld@google.com>
Date: Mon, 14 Jul 2014 18:30:38 -0400
From: David Held <drheld@...gle.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, eric.dumazet@...il.com, willemb@...gle.com,
David Held <drheld@...gle.com>
Subject: [PATCH net-next 1/2] udp: Simplify __udp*_lib_mcast_deliver.
Switch to using sk_nulls_for_each which shortens the code and makes it
easier to update.
Signed-off-by: David Held <drheld@...gle.com>
---
net/ipv4/udp.c | 48 ++++++++++----------------------
net/ipv6/udp.c | 88 +++++++++++++++++++++++-----------------------------------
2 files changed, 49 insertions(+), 87 deletions(-)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index ac30e10..8089ba2 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -594,26 +594,6 @@ static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk,
return true;
}
-static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk,
- __be16 loc_port, __be32 loc_addr,
- __be16 rmt_port, __be32 rmt_addr,
- int dif)
-{
- struct hlist_nulls_node *node;
- unsigned short hnum = ntohs(loc_port);
-
- sk_nulls_for_each_from(sk, node) {
- if (__udp_is_mcast_sock(net, sk,
- loc_port, loc_addr,
- rmt_port, rmt_addr,
- dif, hnum))
- goto found;
- }
- sk = NULL;
-found:
- return sk;
-}
-
/*
* This routine is called by the ICMP module when it gets some
* sort of error condition. If err < 0 then the socket should
@@ -1664,23 +1644,23 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
struct udp_table *udptable)
{
struct sock *sk, *stack[256 / sizeof(struct sock *)];
- struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
- int dif;
+ struct hlist_nulls_node *node;
+ unsigned short hnum = ntohs(uh->dest);
+ struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
+ int dif = skb->dev->ifindex;
unsigned int i, count = 0;
spin_lock(&hslot->lock);
- sk = sk_nulls_head(&hslot->head);
- dif = skb->dev->ifindex;
- sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
- while (sk) {
- stack[count++] = sk;
- sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest,
- daddr, uh->source, saddr, dif);
- if (unlikely(count == ARRAY_SIZE(stack))) {
- if (!sk)
- break;
- flush_stack(stack, count, skb, ~0);
- count = 0;
+ sk_nulls_for_each(sk, node, &hslot->head) {
+ if (__udp_is_mcast_sock(net, sk,
+ uh->dest, daddr,
+ uh->source, saddr,
+ dif, hnum)) {
+ stack[count++] = sk;
+ if (unlikely(count == ARRAY_SIZE(stack))) {
+ flush_stack(stack, count, skb, ~0);
+ count = 0;
+ }
}
}
/*
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index c2bd28f..cade19b 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -698,43 +698,26 @@ drop:
return -1;
}
-static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
- __be16 loc_port, const struct in6_addr *loc_addr,
- __be16 rmt_port, const struct in6_addr *rmt_addr,
- int dif)
+static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
+ __be16 loc_port, const struct in6_addr *loc_addr,
+ __be16 rmt_port, const struct in6_addr *rmt_addr,
+ int dif, unsigned short hnum)
{
- struct hlist_nulls_node *node;
- unsigned short num = ntohs(loc_port);
-
- sk_nulls_for_each_from(sk, node) {
- struct inet_sock *inet = inet_sk(sk);
-
- if (!net_eq(sock_net(sk), net))
- continue;
-
- if (udp_sk(sk)->udp_port_hash == num &&
- sk->sk_family == PF_INET6) {
- if (inet->inet_dport) {
- if (inet->inet_dport != rmt_port)
- continue;
- }
- if (!ipv6_addr_any(&sk->sk_v6_daddr) &&
- !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr))
- continue;
-
- if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
- continue;
+ struct inet_sock *inet = inet_sk(sk);
- if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) {
- if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))
- continue;
- }
- if (!inet6_mc_check(sk, loc_addr, rmt_addr))
- continue;
- return sk;
- }
- }
- return NULL;
+ if (!net_eq(sock_net(sk), net))
+ return false;
+
+ if (udp_sk(sk)->udp_port_hash != hnum ||
+ sk->sk_family != PF_INET6 ||
+ (inet->inet_dport && inet->inet_dport != rmt_port) ||
+ (!ipv6_addr_any(&sk->sk_v6_daddr) &&
+ !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
+ (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
+ return false;
+ if (!inet6_mc_check(sk, loc_addr, rmt_addr))
+ return false;
+ return true;
}
static void flush_stack(struct sock **stack, unsigned int count,
@@ -783,28 +766,27 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
{
struct sock *sk, *stack[256 / sizeof(struct sock *)];
const struct udphdr *uh = udp_hdr(skb);
- struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
- int dif;
+ struct hlist_nulls_node *node;
+ unsigned short hnum = ntohs(uh->dest);
+ struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
+ int dif = inet6_iif(skb);
unsigned int i, count = 0;
spin_lock(&hslot->lock);
- sk = sk_nulls_head(&hslot->head);
- dif = inet6_iif(skb);
- sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
- while (sk) {
- /* If zero checksum and no_check is not on for
- * the socket then skip it.
- */
- if (uh->check || udp_sk(sk)->no_check6_rx)
+ sk_nulls_for_each(sk, node, &hslot->head) {
+ if (__udp_v6_is_mcast_sock(net, sk,
+ uh->dest, daddr,
+ uh->source, saddr,
+ dif, hnum) &&
+ /* If zero checksum and no_check is not on for
+ * the socket then skip it.
+ */
+ (uh->check || udp_sk(sk)->no_check6_rx)) {
stack[count++] = sk;
-
- sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
- uh->source, saddr, dif);
- if (unlikely(count == ARRAY_SIZE(stack))) {
- if (!sk)
- break;
- flush_stack(stack, count, skb, ~0);
- count = 0;
+ if (unlikely(count == ARRAY_SIZE(stack))) {
+ flush_stack(stack, count, skb, ~0);
+ count = 0;
+ }
}
}
/*
--
2.0.0.526.g5318336
--
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