/* Execute a list of actions against 'skb'. */ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, const struct nlattr *attr, int len, bool keep_skb) { /* Every output action needs a separate clone of 'skb', but the common * case is just a single output action, so that doing a clone and * then freeing the original skbuff is wasteful. So the following code * is slightly obscure just to avoid that. */ int prev_port = -1; const struct nlattr *a; int rem; for (a = attr, rem = len; rem > 0; a = nla_next(a, &rem)) { int err = 0; if (prev_port != -1) { do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port); prev_port = -1; } switch (nla_type(a)) { case OVS_ACTION_ATTR_OUTPUT: prev_port = nla_get_u32(a); break; case OVS_ACTION_ATTR_USERSPACE: output_userspace(dp, skb, a); break; case OVS_ACTION_ATTR_PUSH_VLAN: err = push_vlan(skb, nla_data(a)); if (unlikely(err)) /* skb already freed. */ return err; break; case OVS_ACTION_ATTR_POP_VLAN: err = pop_vlan(skb); break; case OVS_ACTION_ATTR_SET: err = execute_set_action(skb, nla_data(a)); break; case OVS_ACTION_ATTR_SAMPLE: err = sample(dp, skb, a); break; } if (unlikely(err)) { kfree_skb(skb); return err; } } if (prev_port != -1) { if (keep_skb) skb = skb_clone(skb, GFP_ATOMIC); do_output(dp, skb, prev_port); } else if (!keep_skb) consume_skb(skb); return 0; }
static int do_execute_actions(struct datapath *dp, struct sk_buff *skb, const struct nlattr *attr, int len, bool keep_skb) { /* */ int prev_port = -1; const struct nlattr *a; int rem; for (a = attr, rem = len; rem > 0; a = nla_next(a, &rem)) { int err = 0; if (prev_port != -1) { do_output(dp, skb_clone(skb, GFP_ATOMIC), prev_port); prev_port = -1; } switch (nla_type(a)) { case OVS_ACTION_ATTR_OUTPUT: prev_port = nla_get_u32(a); break; case OVS_ACTION_ATTR_USERSPACE: output_userspace(dp, skb, a); break; case OVS_ACTION_ATTR_PUSH_VLAN: err = push_vlan(skb, nla_data(a)); if (unlikely(err)) /* */ return err; break; case OVS_ACTION_ATTR_POP_VLAN: err = pop_vlan(skb); break; case OVS_ACTION_ATTR_SET: err = execute_set_action(skb, nla_data(a)); break; case OVS_ACTION_ATTR_SAMPLE: err = sample(dp, skb, a); break; } if (unlikely(err)) { kfree_skb(skb); return err; } } if (prev_port != -1) { if (keep_skb) skb = skb_clone(skb, GFP_ATOMIC); do_output(dp, skb, prev_port); } else if (!keep_skb) consume_skb(skb); return 0; }