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Diffstat (limited to 'net/openvswitch/actions.c')
-rw-r--r--net/openvswitch/actions.c175
1 files changed, 169 insertions, 6 deletions
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 520438b77dc8..72ca2c491b0a 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -22,6 +22,7 @@
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/openvswitch.h>
+#include <linux/netfilter_ipv6.h>
#include <linux/sctp.h>
#include <linux/tcp.h>
#include <linux/udp.h>
@@ -29,6 +30,7 @@
#include <linux/if_arp.h>
#include <linux/if_vlan.h>
+#include <net/dst.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/checksum.h>
@@ -38,6 +40,7 @@
#include "datapath.h"
#include "flow.h"
+#include "conntrack.h"
#include "vport.h"
static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
@@ -52,6 +55,20 @@ struct deferred_action {
struct sw_flow_key pkt_key;
};
+#define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
+struct ovs_frag_data {
+ unsigned long dst;
+ struct vport *vport;
+ struct ovs_skb_cb cb;
+ __be16 inner_protocol;
+ __u16 vlan_tci;
+ __be16 vlan_proto;
+ unsigned int l2_len;
+ u8 l2_data[MAX_L2_LEN];
+};
+
+static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
+
#define DEFERRED_ACTION_FIFO_SIZE 10
struct action_fifo {
int head;
@@ -602,14 +619,145 @@ static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
return 0;
}
-static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
+static int ovs_vport_output(struct sock *sock, struct sk_buff *skb)
+{
+ struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
+ struct vport *vport = data->vport;
+
+ if (skb_cow_head(skb, data->l2_len) < 0) {
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
+
+ __skb_dst_copy(skb, data->dst);
+ *OVS_CB(skb) = data->cb;
+ skb->inner_protocol = data->inner_protocol;
+ skb->vlan_tci = data->vlan_tci;
+ skb->vlan_proto = data->vlan_proto;
+
+ /* Reconstruct the MAC header. */
+ skb_push(skb, data->l2_len);
+ memcpy(skb->data, &data->l2_data, data->l2_len);
+ ovs_skb_postpush_rcsum(skb, skb->data, data->l2_len);
+ skb_reset_mac_header(skb);
+
+ ovs_vport_send(vport, skb);
+ return 0;
+}
+
+static unsigned int
+ovs_dst_get_mtu(const struct dst_entry *dst)
+{
+ return dst->dev->mtu;
+}
+
+static struct dst_ops ovs_dst_ops = {
+ .family = AF_UNSPEC,
+ .mtu = ovs_dst_get_mtu,
+};
+
+/* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
+ * ovs_vport_output(), which is called once per fragmented packet.
+ */
+static void prepare_frag(struct vport *vport, struct sk_buff *skb)
+{
+ unsigned int hlen = skb_network_offset(skb);
+ struct ovs_frag_data *data;
+
+ data = this_cpu_ptr(&ovs_frag_data_storage);
+ data->dst = skb->_skb_refdst;
+ data->vport = vport;
+ data->cb = *OVS_CB(skb);
+ data->inner_protocol = skb->inner_protocol;
+ data->vlan_tci = skb->vlan_tci;
+ data->vlan_proto = skb->vlan_proto;
+ data->l2_len = hlen;
+ memcpy(&data->l2_data, skb->data, hlen);
+
+ memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+ skb_pull(skb, hlen);
+}
+
+static void ovs_fragment(struct vport *vport, struct sk_buff *skb, u16 mru,
+ __be16 ethertype)
+{
+ if (skb_network_offset(skb) > MAX_L2_LEN) {
+ OVS_NLERR(1, "L2 header too long to fragment");
+ return;
+ }
+
+ if (ethertype == htons(ETH_P_IP)) {
+ struct dst_entry ovs_dst;
+ unsigned long orig_dst;
+
+ prepare_frag(vport, skb);
+ dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
+ DST_OBSOLETE_NONE, DST_NOCOUNT);
+ ovs_dst.dev = vport->dev;
+
+ orig_dst = skb->_skb_refdst;
+ skb_dst_set_noref(skb, &ovs_dst);
+ IPCB(skb)->frag_max_size = mru;
+
+ ip_do_fragment(skb->sk, skb, ovs_vport_output);
+ refdst_drop(orig_dst);
+ } else if (ethertype == htons(ETH_P_IPV6)) {
+ const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
+ unsigned long orig_dst;
+ struct rt6_info ovs_rt;
+
+ if (!v6ops) {
+ kfree_skb(skb);
+ return;
+ }
+
+ prepare_frag(vport, skb);
+ memset(&ovs_rt, 0, sizeof(ovs_rt));
+ dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
+ DST_OBSOLETE_NONE, DST_NOCOUNT);
+ ovs_rt.dst.dev = vport->dev;
+
+ orig_dst = skb->_skb_refdst;
+ skb_dst_set_noref(skb, &ovs_rt.dst);
+ IP6CB(skb)->frag_max_size = mru;
+
+ v6ops->fragment(skb->sk, skb, ovs_vport_output);
+ refdst_drop(orig_dst);
+ } else {
+ WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
+ ovs_vport_name(vport), ntohs(ethertype), mru,
+ vport->dev->mtu);
+ kfree_skb(skb);
+ }
+}
+
+static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
+ struct sw_flow_key *key)
{
struct vport *vport = ovs_vport_rcu(dp, out_port);
- if (likely(vport))
- ovs_vport_send(vport, skb);
- else
+ if (likely(vport)) {
+ u16 mru = OVS_CB(skb)->mru;
+
+ if (likely(!mru || (skb->len <= mru + ETH_HLEN))) {
+ ovs_vport_send(vport, skb);
+ } else if (mru <= vport->dev->mtu) {
+ __be16 ethertype = key->eth.type;
+
+ if (!is_flow_key_valid(key)) {
+ if (eth_p_mpls(skb->protocol))
+ ethertype = skb->inner_protocol;
+ else
+ ethertype = vlan_get_protocol(skb);
+ }
+
+ ovs_fragment(vport, skb, mru, ethertype);
+ } else {
+ kfree_skb(skb);
+ }
+ } else {
kfree_skb(skb);
+ }
}
static int output_userspace(struct datapath *dp, struct sk_buff *skb,
@@ -623,6 +771,7 @@ static int output_userspace(struct datapath *dp, struct sk_buff *skb,
memset(&upcall, 0, sizeof(upcall));
upcall.cmd = OVS_PACKET_CMD_ACTION;
+ upcall.mru = OVS_CB(skb)->mru;
for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
a = nla_next(a, &rem)) {
@@ -816,6 +965,11 @@ static int execute_masked_set_action(struct sk_buff *skb,
err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
__be32 *));
break;
+
+ case OVS_KEY_ATTR_CT_STATE:
+ case OVS_KEY_ATTR_CT_ZONE:
+ err = -EINVAL;
+ break;
}
return err;
@@ -885,7 +1039,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC);
if (out_skb)
- do_output(dp, out_skb, prev_port);
+ do_output(dp, out_skb, prev_port, key);
prev_port = -1;
}
@@ -942,6 +1096,15 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
case OVS_ACTION_ATTR_SAMPLE:
err = sample(dp, skb, key, a, attr, len);
break;
+
+ case OVS_ACTION_ATTR_CT:
+ err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
+ nla_data(a));
+
+ /* Hide stolen IP fragments from user space. */
+ if (err == -EINPROGRESS)
+ return 0;
+ break;
}
if (unlikely(err)) {
@@ -951,7 +1114,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
}
if (prev_port != -1)
- do_output(dp, skb, prev_port);
+ do_output(dp, skb, prev_port, key);
else
consume_skb(skb);