struct ovs_key_ethernet addresses;
};
+/*
+ * enum ovs_check_pkt_len_attr - Attributes for %OVS_ACTION_ATTR_CHECK_PKT_LEN.
+ *
+ * @OVS_CHECK_PKT_LEN_ATTR_PKT_LEN: u16 Packet length to check for.
+ * @OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER: Nested OVS_ACTION_ATTR_*
+ * actions to apply if the packer length is greater than the specified
+ * length in the attr - OVS_CHECK_PKT_LEN_ATTR_PKT_LEN.
+ * @OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL - Nested OVS_ACTION_ATTR_*
+ * actions to apply if the packer length is lesser or equal to the specified
+ * length in the attr - OVS_CHECK_PKT_LEN_ATTR_PKT_LEN.
+ */
+enum ovs_check_pkt_len_attr {
+ OVS_CHECK_PKT_LEN_ATTR_UNSPEC,
+ OVS_CHECK_PKT_LEN_ATTR_PKT_LEN,
+ OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER,
+ OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL,
+ __OVS_CHECK_PKT_LEN_ATTR_MAX,
+
+#ifdef __KERNEL__
+ OVS_CHECK_PKT_LEN_ATTR_ARG /* struct check_pkt_len_arg */
+#endif
+};
+
+#define OVS_CHECK_PKT_LEN_ATTR_MAX (__OVS_CHECK_PKT_LEN_ATTR_MAX - 1)
+
+#ifdef __KERNEL__
+struct check_pkt_len_arg {
+ u16 pkt_len; /* Same value as OVS_CHECK_PKT_LEN_ATTR_PKT_LEN'. */
+ bool exec_for_greater; /* When true, actions in IF_GREATER will
+ * not change flow keys. False otherwise.
+ */
+ bool exec_for_lesser_equal; /* When true, actions in IF_LESS_EQUAL
+ * will not change flow keys. False
+ * otherwise.
+ */
+};
+#endif
+
/**
* enum ovs_action_attr - Action types.
*
* packet, or modify the packet (e.g., change the DSCP field).
* @OVS_ACTION_ATTR_CLONE: make a copy of the packet and execute a list of
* actions without affecting the original packet and key.
+ * @OVS_ACTION_ATTR_CHECK_PKT_LEN: Check the packet length and execute a set
+ * of actions if greater than the specified packet length, else execute
+ * another set of actions.
*
* Only a single header can be set with a single %OVS_ACTION_ATTR_SET. Not all
* fields within a header are modifiable, e.g. the IPv4 protocol and fragment
OVS_ACTION_ATTR_POP_NSH, /* No argument. */
OVS_ACTION_ATTR_METER, /* u32 meter ID. */
OVS_ACTION_ATTR_CLONE, /* Nested OVS_CLONE_ATTR_*. */
+ OVS_ACTION_ATTR_CHECK_PKT_LEN, /* Nested OVS_CHECK_PKT_LEN_ATTR_*. */
__OVS_ACTION_ATTR_MAX, /* Nothing past this will be accepted
* from userspace. */
const struct nlattr *actions, int len,
bool last, bool clone_flow_key);
+static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ const struct nlattr *attr, int len);
+
static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr,
__be16 ethertype)
{
return clone_execute(dp, skb, key, recirc_id, NULL, 0, last, true);
}
+static int execute_check_pkt_len(struct datapath *dp, struct sk_buff *skb,
+ struct sw_flow_key *key,
+ const struct nlattr *attr, bool last)
+{
+ const struct nlattr *actions, *cpl_arg;
+ const struct check_pkt_len_arg *arg;
+ int rem = nla_len(attr);
+ bool clone_flow_key;
+
+ /* The first netlink attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
+ */
+ cpl_arg = nla_data(attr);
+ arg = nla_data(cpl_arg);
+
+ if (skb->len <= arg->pkt_len) {
+ /* Second netlink attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
+ */
+ actions = nla_next(cpl_arg, &rem);
+ clone_flow_key = !arg->exec_for_lesser_equal;
+ } else {
+ /* Third netlink attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER'.
+ */
+ actions = nla_next(cpl_arg, &rem);
+ actions = nla_next(actions, &rem);
+ clone_flow_key = !arg->exec_for_greater;
+ }
+
+ return clone_execute(dp, skb, key, 0, nla_data(actions),
+ nla_len(actions), last, clone_flow_key);
+}
+
/* Execute a list of actions against 'skb'. */
static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
struct sw_flow_key *key,
break;
}
+
+ case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
+ bool last = nla_is_last(a, rem);
+
+ err = execute_check_pkt_len(dp, skb, key, a, last);
+ if (last)
+ return err;
+
+ break;
+ }
}
if (unlikely(err)) {
case OVS_ACTION_ATTR_SET:
case OVS_ACTION_ATTR_SET_MASKED:
case OVS_ACTION_ATTR_METER:
+ case OVS_ACTION_ATTR_CHECK_PKT_LEN:
default:
return true;
}
return 0;
}
+static const struct nla_policy cpl_policy[OVS_CHECK_PKT_LEN_ATTR_MAX + 1] = {
+ [OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] = {.type = NLA_U16 },
+ [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER] = {.type = NLA_NESTED },
+ [OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL] = {.type = NLA_NESTED },
+};
+
+static int validate_and_copy_check_pkt_len(struct net *net,
+ const struct nlattr *attr,
+ const struct sw_flow_key *key,
+ struct sw_flow_actions **sfa,
+ __be16 eth_type, __be16 vlan_tci,
+ bool log, bool last)
+{
+ const struct nlattr *acts_if_greater, *acts_if_lesser_eq;
+ struct nlattr *a[OVS_CHECK_PKT_LEN_ATTR_MAX + 1];
+ struct check_pkt_len_arg arg;
+ int nested_acts_start;
+ int start, err;
+
+ err = nla_parse_strict(a, OVS_CHECK_PKT_LEN_ATTR_MAX, nla_data(attr),
+ nla_len(attr), cpl_policy, NULL);
+ if (err)
+ return err;
+
+ if (!a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN] ||
+ !nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]))
+ return -EINVAL;
+
+ acts_if_lesser_eq = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL];
+ acts_if_greater = a[OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER];
+
+ /* Both the nested action should be present. */
+ if (!acts_if_greater || !acts_if_lesser_eq)
+ return -EINVAL;
+
+ /* validation done, copy the nested actions. */
+ start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CHECK_PKT_LEN,
+ log);
+ if (start < 0)
+ return start;
+
+ arg.pkt_len = nla_get_u16(a[OVS_CHECK_PKT_LEN_ATTR_PKT_LEN]);
+ arg.exec_for_lesser_equal =
+ last || !actions_may_change_flow(acts_if_lesser_eq);
+ arg.exec_for_greater =
+ last || !actions_may_change_flow(acts_if_greater);
+
+ err = ovs_nla_add_action(sfa, OVS_CHECK_PKT_LEN_ATTR_ARG, &arg,
+ sizeof(arg), log);
+ if (err)
+ return err;
+
+ nested_acts_start = add_nested_action_start(sfa,
+ OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL, log);
+ if (nested_acts_start < 0)
+ return nested_acts_start;
+
+ err = __ovs_nla_copy_actions(net, acts_if_lesser_eq, key, sfa,
+ eth_type, vlan_tci, log);
+
+ if (err)
+ return err;
+
+ add_nested_action_end(*sfa, nested_acts_start);
+
+ nested_acts_start = add_nested_action_start(sfa,
+ OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER, log);
+ if (nested_acts_start < 0)
+ return nested_acts_start;
+
+ err = __ovs_nla_copy_actions(net, acts_if_greater, key, sfa,
+ eth_type, vlan_tci, log);
+
+ if (err)
+ return err;
+
+ add_nested_action_end(*sfa, nested_acts_start);
+ add_nested_action_end(*sfa, start);
+ return 0;
+}
+
static int copy_action(const struct nlattr *from,
struct sw_flow_actions **sfa, bool log)
{
[OVS_ACTION_ATTR_POP_NSH] = 0,
[OVS_ACTION_ATTR_METER] = sizeof(u32),
[OVS_ACTION_ATTR_CLONE] = (u32)-1,
+ [OVS_ACTION_ATTR_CHECK_PKT_LEN] = (u32)-1,
};
const struct ovs_action_push_vlan *vlan;
int type = nla_type(a);
break;
}
+ case OVS_ACTION_ATTR_CHECK_PKT_LEN: {
+ bool last = nla_is_last(a, rem);
+
+ err = validate_and_copy_check_pkt_len(net, a, key, sfa,
+ eth_type,
+ vlan_tci, log,
+ last);
+ if (err)
+ return err;
+ skip_copy = true;
+ break;
+ }
+
default:
OVS_NLERR(log, "Unknown Action type %d", type);
return -EINVAL;
return err;
}
+static int check_pkt_len_action_to_attr(const struct nlattr *attr,
+ struct sk_buff *skb)
+{
+ struct nlattr *start, *ac_start = NULL;
+ const struct check_pkt_len_arg *arg;
+ const struct nlattr *a, *cpl_arg;
+ int err = 0, rem = nla_len(attr);
+
+ start = nla_nest_start(skb, OVS_ACTION_ATTR_CHECK_PKT_LEN);
+ if (!start)
+ return -EMSGSIZE;
+
+ /* The first nested attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ARG'.
+ */
+ cpl_arg = nla_data(attr);
+ arg = nla_data(cpl_arg);
+
+ if (nla_put_u16(skb, OVS_CHECK_PKT_LEN_ATTR_PKT_LEN, arg->pkt_len)) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+
+ /* Second nested attribute in 'attr' is always
+ * 'OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL'.
+ */
+ a = nla_next(cpl_arg, &rem);
+ ac_start = nla_nest_start(skb,
+ OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_LESS_EQUAL);
+ if (!ac_start) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+
+ err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
+ if (err) {
+ nla_nest_cancel(skb, ac_start);
+ goto out;
+ } else {
+ nla_nest_end(skb, ac_start);
+ }
+
+ /* Third nested attribute in 'attr' is always
+ * OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER.
+ */
+ a = nla_next(a, &rem);
+ ac_start = nla_nest_start(skb,
+ OVS_CHECK_PKT_LEN_ATTR_ACTIONS_IF_GREATER);
+ if (!ac_start) {
+ err = -EMSGSIZE;
+ goto out;
+ }
+
+ err = ovs_nla_put_actions(nla_data(a), nla_len(a), skb);
+ if (err) {
+ nla_nest_cancel(skb, ac_start);
+ goto out;
+ } else {
+ nla_nest_end(skb, ac_start);
+ }
+
+ nla_nest_end(skb, start);
+ return 0;
+
+out:
+ nla_nest_cancel(skb, start);
+ return err;
+}
+
static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
{
const struct nlattr *ovs_key = nla_data(a);
return err;
break;
+ case OVS_ACTION_ATTR_CHECK_PKT_LEN:
+ err = check_pkt_len_action_to_attr(a, skb);
+ if (err)
+ return err;
+ break;
+
default:
if (nla_put(skb, type, nla_len(a), nla_data(a)))
return -EMSGSIZE;
projects / mirror_ubuntu-kernels.git / commitdiff