openvswitch: Add packet truncation support.
The patch adds a new OVS action, OVS_ACTION_ATTR_TRUNC, in order to truncate packets. A 'max_len' is added for setting up the maximum packet size, and a 'cutlen' field is to record the number of bytes to trim the packet when the packet is outputting to a port, or when the packet is sent to userspace. Signed-off-by: William Tu <u9012063@gmail.com> Cc: Pravin Shelar <pshelar@nicira.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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1578b0a5e9
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@ -580,6 +580,10 @@ enum ovs_userspace_attr {
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#define OVS_USERSPACE_ATTR_MAX (__OVS_USERSPACE_ATTR_MAX - 1)
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struct ovs_action_trunc {
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uint32_t max_len; /* Max packet size in bytes. */
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};
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/**
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* struct ovs_action_push_mpls - %OVS_ACTION_ATTR_PUSH_MPLS action argument.
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* @mpls_lse: MPLS label stack entry to push.
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@ -703,6 +707,7 @@ enum ovs_nat_attr {
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* enum ovs_action_attr - Action types.
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*
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* @OVS_ACTION_ATTR_OUTPUT: Output packet to port.
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* @OVS_ACTION_ATTR_TRUNC: Output packet to port with truncated packet size.
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* @OVS_ACTION_ATTR_USERSPACE: Send packet to userspace according to nested
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* %OVS_USERSPACE_ATTR_* attributes.
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* @OVS_ACTION_ATTR_SET: Replaces the contents of an existing header. The
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@ -756,6 +761,7 @@ enum ovs_action_attr {
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* The data must be zero for the unmasked
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* bits. */
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OVS_ACTION_ATTR_CT, /* Nested OVS_CT_ATTR_* . */
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OVS_ACTION_ATTR_TRUNC, /* u32 struct ovs_action_trunc. */
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__OVS_ACTION_ATTR_MAX, /* Nothing past this will be accepted
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* from userspace. */
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@ -750,6 +750,14 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
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if (likely(vport)) {
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u16 mru = OVS_CB(skb)->mru;
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u32 cutlen = OVS_CB(skb)->cutlen;
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if (unlikely(cutlen > 0)) {
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if (skb->len - cutlen > ETH_HLEN)
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pskb_trim(skb, skb->len - cutlen);
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else
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pskb_trim(skb, ETH_HLEN);
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}
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if (likely(!mru || (skb->len <= mru + ETH_HLEN))) {
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ovs_vport_send(vport, skb);
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@ -775,7 +783,8 @@ static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
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static int output_userspace(struct datapath *dp, struct sk_buff *skb,
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struct sw_flow_key *key, const struct nlattr *attr,
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const struct nlattr *actions, int actions_len)
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const struct nlattr *actions, int actions_len,
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uint32_t cutlen)
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{
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struct dp_upcall_info upcall;
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const struct nlattr *a;
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@ -822,7 +831,7 @@ static int output_userspace(struct datapath *dp, struct sk_buff *skb,
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} /* End of switch. */
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}
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return ovs_dp_upcall(dp, skb, key, &upcall);
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return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
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}
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static int sample(struct datapath *dp, struct sk_buff *skb,
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@ -832,6 +841,7 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
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const struct nlattr *acts_list = NULL;
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const struct nlattr *a;
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int rem;
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u32 cutlen = 0;
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for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
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a = nla_next(a, &rem)) {
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@ -858,13 +868,24 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
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return 0;
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/* The only known usage of sample action is having a single user-space
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* action, or having a truncate action followed by a single user-space
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* action. Treat this usage as a special case.
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* The output_userspace() should clone the skb to be sent to the
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* user space. This skb will be consumed by its caller.
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*/
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if (unlikely(nla_type(a) == OVS_ACTION_ATTR_TRUNC)) {
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struct ovs_action_trunc *trunc = nla_data(a);
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if (skb->len > trunc->max_len)
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cutlen = skb->len - trunc->max_len;
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a = nla_next(a, &rem);
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}
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if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
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nla_is_last(a, rem)))
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return output_userspace(dp, skb, key, a, actions, actions_len);
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return output_userspace(dp, skb, key, a, actions,
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actions_len, cutlen);
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skb = skb_clone(skb, GFP_ATOMIC);
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if (!skb)
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@ -1051,6 +1072,7 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
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if (out_skb)
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do_output(dp, out_skb, prev_port, key);
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OVS_CB(skb)->cutlen = 0;
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prev_port = -1;
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}
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@ -1059,8 +1081,18 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
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prev_port = nla_get_u32(a);
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break;
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case OVS_ACTION_ATTR_TRUNC: {
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struct ovs_action_trunc *trunc = nla_data(a);
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if (skb->len > trunc->max_len)
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OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
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break;
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}
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case OVS_ACTION_ATTR_USERSPACE:
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output_userspace(dp, skb, key, a, attr, len);
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output_userspace(dp, skb, key, a, attr,
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len, OVS_CB(skb)->cutlen);
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OVS_CB(skb)->cutlen = 0;
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break;
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case OVS_ACTION_ATTR_HASH:
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@ -137,10 +137,12 @@ EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
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static struct vport *new_vport(const struct vport_parms *);
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static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
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const struct sw_flow_key *,
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const struct dp_upcall_info *);
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const struct dp_upcall_info *,
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uint32_t cutlen);
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static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
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const struct sw_flow_key *,
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const struct dp_upcall_info *);
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const struct dp_upcall_info *,
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uint32_t cutlen);
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/* Must be called with rcu_read_lock. */
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static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
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@ -275,7 +277,7 @@ void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
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upcall.cmd = OVS_PACKET_CMD_MISS;
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upcall.portid = ovs_vport_find_upcall_portid(p, skb);
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upcall.mru = OVS_CB(skb)->mru;
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error = ovs_dp_upcall(dp, skb, key, &upcall);
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error = ovs_dp_upcall(dp, skb, key, &upcall, 0);
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if (unlikely(error))
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kfree_skb(skb);
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else
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@ -300,7 +302,8 @@ out:
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int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
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const struct sw_flow_key *key,
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const struct dp_upcall_info *upcall_info)
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const struct dp_upcall_info *upcall_info,
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uint32_t cutlen)
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{
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struct dp_stats_percpu *stats;
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int err;
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@ -311,9 +314,9 @@ int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
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}
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if (!skb_is_gso(skb))
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err = queue_userspace_packet(dp, skb, key, upcall_info);
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err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
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else
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err = queue_gso_packets(dp, skb, key, upcall_info);
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err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
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if (err)
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goto err;
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@ -331,7 +334,8 @@ err:
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static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
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const struct sw_flow_key *key,
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const struct dp_upcall_info *upcall_info)
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const struct dp_upcall_info *upcall_info,
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uint32_t cutlen)
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{
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unsigned short gso_type = skb_shinfo(skb)->gso_type;
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struct sw_flow_key later_key;
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@ -360,7 +364,7 @@ static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
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if (gso_type & SKB_GSO_UDP && skb != segs)
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key = &later_key;
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err = queue_userspace_packet(dp, skb, key, upcall_info);
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err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
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if (err)
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break;
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@ -416,7 +420,8 @@ static void pad_packet(struct datapath *dp, struct sk_buff *skb)
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static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
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const struct sw_flow_key *key,
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const struct dp_upcall_info *upcall_info)
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const struct dp_upcall_info *upcall_info,
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uint32_t cutlen)
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{
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struct ovs_header *upcall;
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struct sk_buff *nskb = NULL;
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@ -461,7 +466,7 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
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else
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hlen = skb->len;
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len = upcall_msg_size(upcall_info, hlen);
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len = upcall_msg_size(upcall_info, hlen - cutlen);
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user_skb = genlmsg_new(len, GFP_ATOMIC);
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if (!user_skb) {
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err = -ENOMEM;
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err = -ENOBUFS;
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goto out;
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}
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nla->nla_len = nla_attr_size(skb->len);
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nla->nla_len = nla_attr_size(skb->len - cutlen);
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err = skb_zerocopy(user_skb, skb, skb->len, hlen);
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err = skb_zerocopy(user_skb, skb, skb->len - cutlen, hlen);
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if (err)
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goto out;
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@ -100,11 +100,13 @@ struct datapath {
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* @input_vport: The original vport packet came in on. This value is cached
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* when a packet is received by OVS.
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* @mru: The maximum received fragement size; 0 if the packet is not
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* @cutlen: The number of bytes from the packet end to be removed.
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* fragmented.
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*/
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struct ovs_skb_cb {
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struct vport *input_vport;
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u16 mru;
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u32 cutlen;
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};
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#define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
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@ -194,7 +196,8 @@ extern struct genl_family dp_vport_genl_family;
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void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
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void ovs_dp_detach_port(struct vport *);
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int ovs_dp_upcall(struct datapath *, struct sk_buff *,
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const struct sw_flow_key *, const struct dp_upcall_info *);
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const struct sw_flow_key *, const struct dp_upcall_info *,
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uint32_t cutlen);
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const char *ovs_dp_name(const struct datapath *dp);
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struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
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@ -2229,6 +2229,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
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[OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
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[OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash),
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[OVS_ACTION_ATTR_CT] = (u32)-1,
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[OVS_ACTION_ATTR_TRUNC] = sizeof(struct ovs_action_trunc),
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};
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const struct ovs_action_push_vlan *vlan;
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int type = nla_type(a);
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return -EINVAL;
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break;
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case OVS_ACTION_ATTR_TRUNC: {
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const struct ovs_action_trunc *trunc = nla_data(a);
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if (trunc->max_len < ETH_HLEN)
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return -EINVAL;
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break;
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}
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case OVS_ACTION_ATTR_HASH: {
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const struct ovs_action_hash *act_hash = nla_data(a);
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@ -444,6 +444,7 @@ int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
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OVS_CB(skb)->input_vport = vport;
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OVS_CB(skb)->mru = 0;
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OVS_CB(skb)->cutlen = 0;
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if (unlikely(dev_net(skb->dev) != ovs_dp_get_net(vport->dp))) {
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u32 mark;
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