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Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c58
1 files changed, 44 insertions, 14 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 14bc654b6842..4da5758cc718 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -388,7 +388,7 @@ static int compute_score(struct sock *sk, struct net *net,
return -1;
score += 4;
- if (sk->sk_incoming_cpu == raw_smp_processor_id())
+ if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
score++;
return score;
}
@@ -1297,6 +1297,27 @@ out:
#define UDP_SKB_IS_STATELESS 0x80000000
+/* all head states (dst, sk, nf conntrack) except skb extensions are
+ * cleared by udp_rcv().
+ *
+ * We need to preserve secpath, if present, to eventually process
+ * IP_CMSG_PASSSEC at recvmsg() time.
+ *
+ * Other extensions can be cleared.
+ */
+static bool udp_try_make_stateless(struct sk_buff *skb)
+{
+ if (!skb_has_extensions(skb))
+ return true;
+
+ if (!secpath_exists(skb)) {
+ skb_ext_reset(skb);
+ return true;
+ }
+
+ return false;
+}
+
static void udp_set_dev_scratch(struct sk_buff *skb)
{
struct udp_dev_scratch *scratch = udp_skb_scratch(skb);
@@ -1308,14 +1329,24 @@ static void udp_set_dev_scratch(struct sk_buff *skb)
scratch->csum_unnecessary = !!skb_csum_unnecessary(skb);
scratch->is_linear = !skb_is_nonlinear(skb);
#endif
- /* all head states execept sp (dst, sk, nf) are always cleared by
- * udp_rcv() and we need to preserve secpath, if present, to eventually
- * process IP_CMSG_PASSSEC at recvmsg() time
- */
- if (likely(!skb_sec_path(skb)))
+ if (udp_try_make_stateless(skb))
scratch->_tsize_state |= UDP_SKB_IS_STATELESS;
}
+static void udp_skb_csum_unnecessary_set(struct sk_buff *skb)
+{
+ /* We come here after udp_lib_checksum_complete() returned 0.
+ * This means that __skb_checksum_complete() might have
+ * set skb->csum_valid to 1.
+ * On 64bit platforms, we can set csum_unnecessary
+ * to true, but only if the skb is not shared.
+ */
+#if BITS_PER_LONG == 64
+ if (!skb_shared(skb))
+ udp_skb_scratch(skb)->csum_unnecessary = true;
+#endif
+}
+
static int udp_skb_truesize(struct sk_buff *skb)
{
return udp_skb_scratch(skb)->_tsize_state & ~UDP_SKB_IS_STATELESS;
@@ -1550,10 +1581,7 @@ static struct sk_buff *__first_packet_length(struct sock *sk,
*total += skb->truesize;
kfree_skb(skb);
} else {
- /* the csum related bits could be changed, refresh
- * the scratch area
- */
- udp_set_dev_scratch(skb);
+ udp_skb_csum_unnecessary_set(skb);
break;
}
}
@@ -1577,7 +1605,7 @@ static int first_packet_length(struct sock *sk)
spin_lock_bh(&rcvq->lock);
skb = __first_packet_length(sk, rcvq, &total);
- if (!skb && !skb_queue_empty(sk_queue)) {
+ if (!skb && !skb_queue_empty_lockless(sk_queue)) {
spin_lock(&sk_queue->lock);
skb_queue_splice_tail_init(sk_queue, rcvq);
spin_unlock(&sk_queue->lock);
@@ -1650,7 +1678,7 @@ struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags,
return skb;
}
- if (skb_queue_empty(sk_queue)) {
+ if (skb_queue_empty_lockless(sk_queue)) {
spin_unlock_bh(&queue->lock);
goto busy_check;
}
@@ -1676,7 +1704,7 @@ busy_check:
break;
sk_busy_loop(sk, flags & MSG_DONTWAIT);
- } while (!skb_queue_empty(sk_queue));
+ } while (!skb_queue_empty_lockless(sk_queue));
/* sk_queue is empty, reader_queue may contain peeked packets */
} while (timeo &&
@@ -2523,9 +2551,11 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
case UDP_ENCAP:
switch (val) {
case 0:
+#ifdef CONFIG_XFRM
case UDP_ENCAP_ESPINUDP:
case UDP_ENCAP_ESPINUDP_NON_IKE:
up->encap_rcv = xfrm4_udp_encap_rcv;
+#endif
/* FALLTHROUGH */
case UDP_ENCAP_L2TPINUDP:
up->encap_type = val;
@@ -2712,7 +2742,7 @@ __poll_t udp_poll(struct file *file, struct socket *sock, poll_table *wait)
__poll_t mask = datagram_poll(file, sock, wait);
struct sock *sk = sock->sk;
- if (!skb_queue_empty(&udp_sk(sk)->reader_queue))
+ if (!skb_queue_empty_lockless(&udp_sk(sk)->reader_queue))
mask |= EPOLLIN | EPOLLRDNORM;
/* Check for false positives due to checksum errors */