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openvswitch: pass mac_proto to ovs_vport_send

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We'll need it to alter packets sent to ARPHRD_NONE interfaces.

Change do_output() to use the actual L2 header size of the packet when
deciding on the minimum cutlen. The assumption here is that what matters is
not the output interface hard_header_len but rather the L2 header of the
particular packet. For example, ARPHRD_NONE tunnels that encapsulate
Ethernet should get at least the Ethernet header.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2016-11-10 16:28:19 +01:00 committed by David S. Miller
parent 329f45bc4f
commit e2d9d8358c
3 changed files with 19 additions and 14 deletions
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29
net/openvswitch/actions.c
View File

@ -66,6 +66,7 @@ struct ovs_frag_data {
u16 vlan_tci; u16 vlan_tci;
__be16 vlan_proto; __be16 vlan_proto;
unsigned int l2_len; unsigned int l2_len;
u8 mac_proto;
u8 l2_data[MAX_L2_LEN]; u8 l2_data[MAX_L2_LEN];
}; };
@ -673,7 +674,7 @@ static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *sk
skb_reset_mac_len(skb); skb_reset_mac_len(skb);
} }
ovs_vport_send(vport, skb); ovs_vport_send(vport, skb, data->mac_proto);
return 0; return 0;
} }
@ -692,7 +693,7 @@ static struct dst_ops ovs_dst_ops = {
* ovs_vport_output(), which is called once per fragmented packet. * ovs_vport_output(), which is called once per fragmented packet.
*/ */
static void prepare_frag(struct vport *vport, struct sk_buff *skb, static void prepare_frag(struct vport *vport, struct sk_buff *skb,
u16 orig_network_offset) u16 orig_network_offset, u8 mac_proto)
{ {
unsigned int hlen = skb_network_offset(skb); unsigned int hlen = skb_network_offset(skb);
struct ovs_frag_data *data; struct ovs_frag_data *data;
@ -705,6 +706,7 @@ static void prepare_frag(struct vport *vport, struct sk_buff *skb,
data->network_offset = orig_network_offset; data->network_offset = orig_network_offset;
data->vlan_tci = skb->vlan_tci; data->vlan_tci = skb->vlan_tci;
data->vlan_proto = skb->vlan_proto; data->vlan_proto = skb->vlan_proto;
data->mac_proto = mac_proto;
data->l2_len = hlen; data->l2_len = hlen;
memcpy(&data->l2_data, skb->data, hlen); memcpy(&data->l2_data, skb->data, hlen);
@ -713,7 +715,8 @@ static void prepare_frag(struct vport *vport, struct sk_buff *skb,
} }
static void ovs_fragment(struct net *net, struct vport *vport, static void ovs_fragment(struct net *net, struct vport *vport,
struct sk_buff *skb, u16 mru, __be16 ethertype) struct sk_buff *skb, u16 mru,
struct sw_flow_key *key)
{ {
u16 orig_network_offset = 0; u16 orig_network_offset = 0;
@ -727,11 +730,12 @@ static void ovs_fragment(struct net *net, struct vport *vport,
goto err; goto err;
} }
if (ethertype == htons(ETH_P_IP)) { if (key->eth.type == htons(ETH_P_IP)) {
struct dst_entry ovs_dst; struct dst_entry ovs_dst;
unsigned long orig_dst; unsigned long orig_dst;
prepare_frag(vport, skb, orig_network_offset); prepare_frag(vport, skb, orig_network_offset,
ovs_key_mac_proto(key));
dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1, dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
DST_OBSOLETE_NONE, DST_NOCOUNT); DST_OBSOLETE_NONE, DST_NOCOUNT);
ovs_dst.dev = vport->dev; ovs_dst.dev = vport->dev;
@ -742,7 +746,7 @@ static void ovs_fragment(struct net *net, struct vport *vport,
ip_do_fragment(net, skb->sk, skb, ovs_vport_output); ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
refdst_drop(orig_dst); refdst_drop(orig_dst);
} else if (ethertype == htons(ETH_P_IPV6)) { } else if (key->eth.type == htons(ETH_P_IPV6)) {
const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
unsigned long orig_dst; unsigned long orig_dst;
struct rt6_info ovs_rt; struct rt6_info ovs_rt;
@ -751,7 +755,8 @@ static void ovs_fragment(struct net *net, struct vport *vport,
goto err; goto err;
} }
prepare_frag(vport, skb, orig_network_offset); prepare_frag(vport, skb, orig_network_offset,
ovs_key_mac_proto(key));
memset(&ovs_rt, 0, sizeof(ovs_rt)); memset(&ovs_rt, 0, sizeof(ovs_rt));
dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1, dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
DST_OBSOLETE_NONE, DST_NOCOUNT); DST_OBSOLETE_NONE, DST_NOCOUNT);
@ -765,7 +770,7 @@ static void ovs_fragment(struct net *net, struct vport *vport,
refdst_drop(orig_dst); refdst_drop(orig_dst);
} else { } else {
WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.", WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
ovs_vport_name(vport), ntohs(ethertype), mru, ovs_vport_name(vport), ntohs(key->eth.type), mru,
vport->dev->mtu); vport->dev->mtu);
goto err; goto err;
} }
@ -785,19 +790,19 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
u32 cutlen = OVS_CB(skb)->cutlen; u32 cutlen = OVS_CB(skb)->cutlen;
if (unlikely(cutlen > 0)) { if (unlikely(cutlen > 0)) {
if (skb->len - cutlen > ETH_HLEN) if (skb->len - cutlen > ovs_mac_header_len(key))
pskb_trim(skb, skb->len - cutlen); pskb_trim(skb, skb->len - cutlen);
else else
pskb_trim(skb, ETH_HLEN); pskb_trim(skb, ovs_mac_header_len(key));
} }
if (likely(!mru || if (likely(!mru ||
(skb->len <= mru + vport->dev->hard_header_len))) { (skb->len <= mru + vport->dev->hard_header_len))) {
ovs_vport_send(vport, skb); ovs_vport_send(vport, skb, ovs_key_mac_proto(key));
} else if (mru <= vport->dev->mtu) { } else if (mru <= vport->dev->mtu) {
struct net *net = read_pnet(&dp->net); struct net *net = read_pnet(&dp->net);
ovs_fragment(net, vport, skb, mru, key->eth.type); ovs_fragment(net, vport, skb, mru, key);
} else { } else {
kfree_skb(skb); kfree_skb(skb);
} }

2
net/openvswitch/vport.c
View File

@ -481,7 +481,7 @@ static unsigned int packet_length(const struct sk_buff *skb,
return length; return length;
} }
void ovs_vport_send(struct vport *vport, struct sk_buff *skb) void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)
{ {
int mtu = vport->dev->mtu; int mtu = vport->dev->mtu;

2
net/openvswitch/vport.h
View File

@ -197,6 +197,6 @@ int __ovs_vport_ops_register(struct vport_ops *ops);
}) })
void ovs_vport_ops_unregister(struct vport_ops *ops); void ovs_vport_ops_unregister(struct vport_ops *ops);
void ovs_vport_send(struct vport *vport, struct sk_buff *skb); void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto);
#endif /* vport.h */ #endif /* vport.h */