X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=genrules.py;h=a09fde157e9eed0988e54a385a79cbba6721ac15;hb=14f8186f33558b42201be806e9725acd3d445182;hp=a8d23a779b95f7b9b237786cfc84fac5b3d6e8b9;hpb=3f92cfcefa251b2cba4dd25497e01400006949b0;p=flowspec-xdp diff --git a/genrules.py b/genrules.py index a8d23a7..a09fde1 100755 --- a/genrules.py +++ b/genrules.py @@ -199,7 +199,7 @@ def ip_to_rule(proto, inip, ty, offset): break;""" def fragment_to_rule(ipproto, rules): - ast = parse_ast(rules, parse_frag_expr, True) + ast = parse_ast(rules, parse_frag_expr, False) return "if (!( " + ast.write(ipproto) + " )) break;" def len_to_rule(rules): @@ -239,10 +239,10 @@ def dscp_to_rule(proto, rules): def port_to_rule(ty, rules): if ty == "port" : ast = parse_ast(rules, parse_numbers_expr, True) - return "if (!ports_valid) break;\nif (!( " + ast.write("sport", "dport") + " )) break;" + return "if (sport == -1 || dport == -1) break;\nif (!( " + ast.write("sport", "dport") + " )) break;" ast = parse_ast(rules, parse_numbers_expr, True) - return "if (!ports_valid) break;\nif (!( " + ast.write(ty) + " )) break;" + return "if (" + ty + " == -1) break;\nif (!( " + ast.write(ty) + " )) break;" def tcp_flags_to_rule(rules): ast = parse_ast(rules, parse_bit_expr, False) @@ -296,8 +296,8 @@ with open("rules.h", "w") as out: use_v6_frags = False rulecnt = 0 ratelimitcnt = 0 - v4persrcratelimitcnt = 0 - v6persrcratelimitcnt = 0 + v4persrcratelimits = [] + v6persrcratelimits = [] lastrule = None for line in sys.stdin.readlines(): @@ -378,7 +378,8 @@ with open("rules.h", "w") as out: if len(blocks[1].strip()) != 10: # Should be 0x12345678 continue ty = blocks[1].strip()[:6] - high_byte = int(blocks[1].strip()[8:], 16) + high_byte = int(blocks[1].strip()[6:8], 16) + mid_byte = int(blocks[1].strip()[8:], 16) low_bytes = int(blocks[2].strip(") \n"), 16) if ty == "0x8006" or ty == "0x800c" or ty == "0x8306" or ty == "0x830c": if first_action is not None: @@ -401,10 +402,6 @@ with open("rules.h", "w") as out: mantissa = low_bytes & ((1 << 23) - 1) value = 1.0 + mantissa / (2**23) value *= 2**(exp-127) - if ty == "0x8006" or ty == "0x8306": - accessor = "rate->rate.sent_bytes" - else: - accessor = "rate->rate.sent_packets" # Note that int64_t will overflow after 292 years of uptime first_action = "int64_t time = bpf_ktime_get_ns();\n" first_action += "uint64_t allowed_since_last = 0;\n" @@ -415,36 +412,39 @@ with open("rules.h", "w") as out: first_action += "struct ratelimit *rate = bpf_map_lookup_elem(&rate_map, &ratelimitidx);\n" ratelimitcnt += 1 else: - spin_lock = "/* No locking as we're per-CPU */" - spin_unlock = "/* No locking as we're per-CPU */" + spin_lock = "/* No locking as we're locked in get_v*_persrc_ratelimit */" + spin_unlock = "bpf_spin_unlock(rate_ptr.lock);" if proto == 4: - if high_byte > 32: + if mid_byte > 32: continue - first_action += f"const uint32_t srcip = ip->saddr & MASK4({high_byte});\n" - first_action += f"void *rate_map = &v4_src_rate_{v4persrcratelimitcnt};\n" - v4persrcratelimitcnt += 1 + first_action += f"const uint32_t srcip = ip->saddr & MASK4({mid_byte});\n" + first_action += f"void *rate_map = &v4_src_rate_{len(v4persrcratelimits)};\n" + first_action += f"struct persrc_rate4_ptr rate_ptr = get_v4_persrc_ratelimit(srcip, rate_map, {(high_byte + 1) * 1024});\n" + first_action += f"struct persrc_rate4_entry *rate = rate_ptr.rate;\n" + v4persrcratelimits.append((high_byte + 1) * 1024) else: - if high_byte > 128: + if mid_byte > 128: continue - first_action += f"const uint128_t srcip = ip6->saddr & MASK6({high_byte});\n" - first_action += f"void *rate_map = &v6_src_rate_{v6persrcratelimitcnt};\n" - v6persrcratelimitcnt += 1 - first_action += f"struct percpu_ratelimit *rate = bpf_map_lookup_elem(rate_map, &srcip);\n" + first_action += f"const uint128_t srcip = ip6->saddr & MASK6({mid_byte});\n" + first_action += f"void *rate_map = &v6_src_rate_{len(v6persrcratelimits)};\n" + first_action += f"struct persrc_rate6_ptr rate_ptr = get_v6_persrc_ratelimit(srcip, rate_map, {(high_byte + 1) * 1024});\n" + first_action += f"struct persrc_rate6_entry *rate = rate_ptr.rate;\n" + v6persrcratelimits.append((high_byte + 1) * 1024) first_action += "if (rate) {\n" first_action += f"\t{spin_lock}\n" - first_action += f"\tif (likely({accessor} > 0))" + " {\n" + first_action += "\tif (likely(rate->sent_rate > 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\t\trate->sent_rate = 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" + first_action += "\tif (rate->sent_rate - ((int64_t)allowed_since_last) <= 0)" + " {\n" if ty == "0x8006" or ty == "0x8306": - first_action += f"\t\t{accessor} = data_end - pktdata;\n" + first_action += "\t\trate->sent_rate = data_end - pktdata;\n" else: - first_action += f"\t\t{accessor} = 1;\n" + first_action += "\t\trate->sent_rate = 1;\n" first_action += "\t\trate->sent_time = time;\n" first_action += f"\t\t{spin_unlock}\n" first_action += "\t} else {\n" @@ -452,15 +452,6 @@ with open("rules.h", "w") as out: first_action += "\t\t{stats_replace}\n" first_action += "\t\treturn XDP_DROP;\n" first_action += "\t}\n" - if ty == "0x8306" or ty == "0x830c": - first_action += "} else {\n" - first_action += "\tstruct percpu_ratelimit new_rate = { .sent_time = time, };\n" - first_action += "\trate = &new_rate;\n" - if ty == "0x8006" or ty == "0x8306": - first_action += f"\t\t{accessor} = data_end - pktdata;\n" - else: - first_action += f"\t\t{accessor} = 1;\n" - first_action += "\tbpf_map_update_elem(rate_map, &srcip, rate, BPF_ANY);\n" first_action += "}\n" elif ty == "0x8007": if low_bytes & 1 == 0: @@ -501,10 +492,6 @@ with open("rules.h", "w") as out: out.write(f"#define RULECNT {rulecnt}\n") if ratelimitcnt != 0: out.write(f"#define RATE_CNT {ratelimitcnt}\n") - if v4persrcratelimitcnt != 0: - out.write(f"#define V4_SRC_RATE_CNT {v4persrcratelimitcnt}\n") - if v6persrcratelimitcnt != 0: - out.write(f"#define V6_SRC_RATE_CNT {v6persrcratelimitcnt}\n") if rules4 != "": out.write("#define NEED_V4_PARSE\n") out.write("#define RULES4 {\\\n" + rules4 + "}\n") @@ -514,3 +501,8 @@ with open("rules.h", "w") as out: if args.v6frag == "ignore-parse-if-rule": if use_v6_frags: out.write("#define PARSE_V6_FRAG PARSE\n") + with open("maps.h", "w") as out: + for idx, limit in enumerate(v4persrcratelimits): + out.write(f"SRC_RATE_DEFINE(4, {idx}, {limit})\n") + for idx, limit in enumerate(v6persrcratelimits): + out.write(f"SRC_RATE_DEFINE(6, {idx}, {limit})\n")