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authorWillem de Bruijn <willemb@google.com>2016-02-03 18:02:15 -0500
committerDavid S. Miller <davem@davemloft.net>2016-02-09 06:43:50 -0500
commit58d19b19cd99b438541eea4cdbf5c171900b25e5 (patch)
treeb138b60ee1048ad9c03900d97a6ca87b7d3cce64 /net/packet
parent16cc1400456a4d5d6df9f5e7f1b2c7cb8c50404b (diff)
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packet: vnet_hdr support for tpacket_rcv
Support socket option PACKET_VNET_HDR together with PACKET_RX_RING. When enabled, a struct virtio_net_hdr will precede the data in the packet ring slots. Verified with test program at github.com/wdebruij/kerneltools/blob/master/tests/psock_rxring_vnet.c pkt: 1454269209.798420 len=5066 vnet: gso_type=tcpv4 gso_size=1448 hlen=66 ecn=off csum: start=34 off=16 eth: proto=0x800 ip: src=<masked> dst=<masked> proto=6 len=5052 Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c19
1 files changed, 15 insertions, 4 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index bd3de7b4fb79..b26df32cc64f 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2206,7 +2206,9 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
unsigned int maclen = skb_network_offset(skb);
netoff = TPACKET_ALIGN(po->tp_hdrlen +
(maclen < 16 ? 16 : maclen)) +
- po->tp_reserve;
+ po->tp_reserve;
+ if (po->has_vnet_hdr)
+ netoff += sizeof(struct virtio_net_hdr);
macoff = netoff - maclen;
}
if (po->tp_version <= TPACKET_V2) {
@@ -2243,7 +2245,7 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
h.raw = packet_current_rx_frame(po, skb,
TP_STATUS_KERNEL, (macoff+snaplen));
if (!h.raw)
- goto ring_is_full;
+ goto drop_n_account;
if (po->tp_version <= TPACKET_V2) {
packet_increment_rx_head(po, &po->rx_ring);
/*
@@ -2262,6 +2264,14 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
}
spin_unlock(&sk->sk_receive_queue.lock);
+ if (po->has_vnet_hdr) {
+ if (__packet_rcv_vnet(skb, h.raw + macoff -
+ sizeof(struct virtio_net_hdr))) {
+ spin_lock(&sk->sk_receive_queue.lock);
+ goto drop_n_account;
+ }
+ }
+
skb_copy_bits(skb, 0, h.raw + macoff, snaplen);
if (!(ts_status = tpacket_get_timestamp(skb, &ts, po->tp_tstamp)))
@@ -2357,7 +2367,7 @@ drop:
kfree_skb(skb);
return 0;
-ring_is_full:
+drop_n_account:
po->stats.stats1.tp_drops++;
spin_unlock(&sk->sk_receive_queue.lock);
@@ -3587,7 +3597,8 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
}
if (optlen < len)
return -EINVAL;
- if (pkt_sk(sk)->has_vnet_hdr)
+ if (pkt_sk(sk)->has_vnet_hdr &&
+ optname == PACKET_TX_RING)
return -EINVAL;
if (copy_from_user(&req_u.req, optval, len))
return -EFAULT;