- first_action += "struct ratelimit *rate = bpf_map_lookup_elem(&rate_map, &ratelimitidx);\n"
- first_action += "if (rate) {\n"
- first_action += "\tbpf_spin_lock(&rate->lock);\n"
- first_action += "\tif (secs != rate->bucket_secs) {\n"
- first_action += "\t\trate->bucket_secs = secs;\n"
- first_action += "\t\trate->bucket_count = 0;\n"
- first_action += "\t}\n"
- first_action += f"\tif (rate->bucket_count + (data_end - pktdata) > {math.floor(value)})\n"
- first_action += "\t\t{ bpf_spin_unlock(&rate->lock); return XDP_DROP; }\n"
- first_action += "\trate->bucket_count += data_end - pktdata;\n"
- first_action += "\tbpf_spin_unlock(&rate->lock);\n"
- first_action += "}\n"
+ first_action += "uint64_t allowed_since_last = 0;\n"
+ first_action += "struct ratelimit *rate = bpf_map_lookup_elem(&rate_map, &ratelimitidx);\n"
+ first_action += "if (rate) {\n"
+ first_action += "\tbpf_spin_lock(&rate->lock);\n"
+ first_action += f"\tif (likely({accessor} > 0))" + " {\n"
+ first_action += "\t\tint64_t diff = time - rate->sent_time;\n"
+ # Unlikely or not, if the flow is slow, take a perf hit (though with the else if branch it doesn't matter)
+ first_action += "\t\tif (unlikely(diff > 1000000000))\n"
+ first_action += f"\t\t\t{accessor} = 0;\n"
+ first_action += "\t\telse if (likely(diff > 0))\n"
+ first_action += f"\t\t\tallowed_since_last = ((uint64_t)diff) * {math.floor(value)} / 1000000000;\n"
+ first_action += "\t}\n"
+ first_action += f"\tif ({accessor} - ((int64_t)allowed_since_last) <= 0)" + " {\n"
+ if ty == "0x8006":
+ first_action += f"\t\t{accessor} = data_end - pktdata;\n"
+ else:
+ first_action += f"\t\t{accessor} = 1;\n"
+ first_action += "\t\trate->sent_time = time;\n"
+ first_action += "\t\tbpf_spin_unlock(&rate->lock);\n"
+ first_action += "\t} else {\n"
+ first_action += "\t\tbpf_spin_unlock(&rate->lock);\n"
+ first_action += "\t\treturn XDP_DROP;\n"
+ first_action += "\t}\n"
+ first_action += "}\n"