X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=flowspec-xdp;a=blobdiff_plain;f=genrules.py;h=a9f3d16db50c54ee04830757a4d5482fd8d7f39c;hp=480e628dca23574ccffb8e28095bf6cda662770e;hb=HEAD;hpb=891dade88d85923a278d2e2ebc2c4ce615263204 diff --git a/genrules.py b/genrules.py index 480e628..a9f3d16 100755 --- a/genrules.py +++ b/genrules.py @@ -4,6 +4,7 @@ import sys import ipaddress from enum import Enum import argparse +import math IP_PROTO_ICMP = 1 @@ -11,6 +12,10 @@ IP_PROTO_ICMPV6 = 58 IP_PROTO_TCP = 6 IP_PROTO_UDP = 17 +ORD_LESS = 0 +ORD_GREATER = 1 +ORD_EQUAL = 2 + class ASTAction(Enum): OR = 1 AND = 2 @@ -44,20 +49,26 @@ class ASTNode: if self.action == ASTAction.EXPR: return self.left.write(expr_param, expr_param2) -def parse_ast(expr, parse_expr): +def parse_ast(expr, parse_expr, comma_is_or): expr = expr.strip() comma_split = expr.split(",", 1) or_split = expr.split("||", 1) if len(comma_split) > 1 and not "||" in comma_split[0]: - return ASTNode(ASTAction.OR, parse_ast(comma_split[0], parse_expr), parse_ast(comma_split[1], parse_expr)) + # Confusingly, BIRD uses `,` as either || or &&, depending on the type + # of expression being parsed. Specifically, a `numbers-match` uses `,` + # as OR, whereas a `bitmask-match` uses `,` as AND. + if comma_is_or: + return ASTNode(ASTAction.OR, parse_ast(comma_split[0], parse_expr, comma_is_or), parse_ast(comma_split[1], parse_expr, comma_is_or)) + else: + return ASTNode(ASTAction.AND, parse_ast(comma_split[0], parse_expr, comma_is_or), parse_ast(comma_split[1], parse_expr, comma_is_or)) if len(or_split) > 1: assert not "," in or_split[0] - return ASTNode(ASTAction.OR, parse_ast(or_split[0], parse_expr), parse_ast(or_split[1], parse_expr)) + return ASTNode(ASTAction.OR, parse_ast(or_split[0], parse_expr, comma_is_or), parse_ast(or_split[1], parse_expr, comma_is_or)) and_split = expr.split("&&", 1) if len(and_split) > 1: - return ASTNode(ASTAction.AND, parse_ast(and_split[0], parse_expr), parse_ast(and_split[1], parse_expr)) + return ASTNode(ASTAction.AND, parse_ast(and_split[0], parse_expr, comma_is_or), parse_ast(and_split[1], parse_expr, comma_is_or)) if expr.strip() == "true": return ASTNode(ASTAction.TRUE, None) @@ -65,7 +76,7 @@ def parse_ast(expr, parse_expr): return ASTNode(ASTAction.FALSE, None) if expr.startswith("!"): - return ASTNode(ASTAction.NOT, parse_ast(expr[1:], parse_expr)) + return ASTNode(ASTAction.NOT, parse_ast(expr[1:], parse_expr, comma_is_or)) return parse_expr(expr) @@ -168,39 +179,78 @@ def parse_bit_expr(expr): return ASTNode(ASTAction.EXPR, BitExpr(expr)) +class IpRule: + def __init__(self, ty, offset, net, proto): + self.ty = ty + self.offset = offset + if offset is None: + self.offset = 0 + self.net = net + self.proto = proto + + def ord(self, other): + assert self.ty == other.ty + assert self.proto == other.proto + if self.offset < other.offset: + return ORD_LESS + if self.offset > other.offset: + return ORD_GREATER + + if self.net.overlaps(other.net): + if self.net.prefixlen > other.net.prefixlen: + return ORD_LESS + elif self.net.prefixlen < other.net.prefixlen: + return ORD_GREATER + else: + if self.net < other.net: + return ORD_LESS + else: + assert self.net > other.net + return ORD_GREATER + + return ORD_EQUAL + + def __lt__(self, other): + return self.ord(other) == ORD_LESS + + def __eq__(self, other): + return type(other) == IpRule and self.ty == other.ty and self.offset == other.offset and self.net == other.net and self.proto == other.proto + + def __str__(self): + if self.proto == 4: + assert self.offset == 0 + return f"""if ((ip->{self.ty} & MASK4({self.net.prefixlen})) != BIGEND32({int(self.net.network_address)}ULL)) + break;""" + else: + u32s = [(int(self.net.network_address) >> (3*32)) & 0xffffffff, + (int(self.net.network_address) >> (2*32)) & 0xffffffff, + (int(self.net.network_address) >> (1*32)) & 0xffffffff, + (int(self.net.network_address) >> (0*32)) & 0xffffffff] + if self.offset == 0: + mask = f"MASK6({self.net.prefixlen})" + else: + mask = f"MASK6_OFFS({self.offset}, {self.net.prefixlen})" + return f"""if ((ip6->{self.ty} & {mask}) != (BIGEND128({u32s[0]}ULL, {u32s[1]}ULL, {u32s[2]}ULL, {u32s[3]}ULL) & {mask})) + break;""" def ip_to_rule(proto, inip, ty, offset): if proto == 4: assert offset is None net = ipaddress.IPv4Network(inip.strip()) - if net.prefixlen == 0: - return "" - return f"""if ((ip->{ty} & MASK4({net.prefixlen})) != BIGEND32({int(net.network_address)}ULL)) - break;""" + return IpRule(ty, offset, net, 4) else: net = ipaddress.IPv6Network(inip.strip()) - if net.prefixlen == 0: - return "" - u32s = [(int(net.network_address) >> (3*32)) & 0xffffffff, - (int(net.network_address) >> (2*32)) & 0xffffffff, - (int(net.network_address) >> (1*32)) & 0xffffffff, - (int(net.network_address) >> (0*32)) & 0xffffffff] - if offset is None: - mask = f"MASK6({net.prefixlen})" - else: - mask = f"MASK6_OFFS({offset}, {net.prefixlen})" - return f"""if ((ip6->{ty} & {mask}) != (BIGEND128({u32s[0]}ULL, {u32s[1]}ULL, {u32s[2]}ULL, {u32s[3]}ULL) & {mask})) - break;""" + return IpRule(ty, offset, net, 6) def fragment_to_rule(ipproto, rules): - ast = parse_ast(rules, parse_frag_expr) + ast = parse_ast(rules, parse_frag_expr, False) return "if (!( " + ast.write(ipproto) + " )) break;" def len_to_rule(rules): - ast = parse_ast(rules, parse_numbers_expr) + ast = parse_ast(rules, parse_numbers_expr, True) return "if (!( " + ast.write("(data_end - pktdata)") + " )) break;" def proto_to_rule(ipproto, proto): - ast = parse_ast(proto, parse_numbers_expr) + ast = parse_ast(proto, parse_numbers_expr, True) if ipproto == 4: return "if (!( " + ast.write("ip->protocol") + " )) break;" @@ -208,21 +258,21 @@ def proto_to_rule(ipproto, proto): return "if (!( " + ast.write("ip6->nexthdr") + " )) break;" def icmp_type_to_rule(proto, ty): - ast = parse_ast(ty, parse_numbers_expr) + ast = parse_ast(ty, parse_numbers_expr, True) if proto == 4: return "if (icmp == NULL) break;\nif (!( " + ast.write("icmp->type") + " )) break;" else: return "if (icmpv6 == NULL) break;\nif (!( " + ast.write("icmpv6->icmp6_type") + " )) break;" def icmp_code_to_rule(proto, code): - ast = parse_ast(code, parse_numbers_expr) + ast = parse_ast(code, parse_numbers_expr, True) if proto == 4: return "if (icmp == NULL) break;\nif (!( " + ast.write("icmp->code") + " )) break;" else: return "if (icmpv6 == NULL) break;\nif (!( " + ast.write("icmpv6->icmp6_code") + " )) break;" def dscp_to_rule(proto, rules): - ast = parse_ast(rules, parse_numbers_expr) + ast = parse_ast(rules, parse_numbers_expr, True) if proto == 4: return "if (!( " + ast.write("((ip->tos & 0xfc) >> 2)") + " )) break;" @@ -231,24 +281,119 @@ def dscp_to_rule(proto, rules): def port_to_rule(ty, rules): if ty == "port" : - ast = parse_ast(rules, parse_numbers_expr) - return "if (!ports_valid) break;\nif (!( " + ast.write("sport", "dport") + " )) break;" + ast = parse_ast(rules, parse_numbers_expr, True) + return "if (sport == -1 || dport == -1) break;\nif (!( " + ast.write("sport", "dport") + " )) break;" - ast = parse_ast(rules, parse_numbers_expr) - return "if (!ports_valid) break;\nif (!( " + ast.write(ty) + " )) break;" + ast = parse_ast(rules, parse_numbers_expr, True) + return "if (" + ty + " == -1) break;\nif (!( " + ast.write(ty) + " )) break;" def tcp_flags_to_rule(rules): - ast = parse_ast(rules, parse_bit_expr) + ast = parse_ast(rules, parse_bit_expr, False) return f"""if (tcp == NULL) break; if (!( {ast.write("(ntohs(tcp->flags) & 0xfff)")} )) break;""" def flow_label_to_rule(rules): - ast = parse_ast(rules, parse_bit_expr) + ast = parse_ast(rules, parse_bit_expr, False) return f"""if (ip6 == NULL) break; if (!( {ast.write("((((uint32_t)(ip6->flow_lbl[0] & 0xf)) << 2*8) | (((uint32_t)ip6->flow_lbl[1]) << 1*8) | (uint32_t)ip6->flow_lbl[0])")} )) break;""" +class RuleAction(Enum): + CONDITIONS = 1 + ACTION = 2 + LIST = 3 +class RuleNode: + def __init__(self, ty, action, inner): + self.ty = ty + self.action = action + self.inner = inner + if ty == RuleAction.ACTION: + assert inner is None + assert type(action) == str + elif ty == RuleAction.LIST: + assert type(inner) == list + assert action is None + for item in inner: + assert type(item) == RuleNode + else: + assert ty == RuleAction.CONDITIONS + assert type(action) == list + assert type(inner) == RuleNode + + def __lt__(self, other): + assert self.ty == RuleAction.CONDITIONS + assert other.ty == RuleAction.CONDITIONS + + o = ORD_EQUAL + + # RFC first has us sort by dest, then source, then other conditions. We don't implement the + # other conditions because doing so requires re-implementing the Flowspec wire format, + # which isn't trivial. However, we do implement the source/dest sorting in the hopes it + # allows us to group rules according to source/dest IP and hopefully LLVM optimizes out + # later rules. + + selfdest = next(filter(lambda a : type(a) == IpRule and a.ty == "daddr", self.action), None) + otherdest = next(filter(lambda a : type(a) == IpRule and a.ty == "daddr", self.action), None) + if o == ORD_EQUAL and selfdest is not None and otherdest is not None: + o = selfdest.ord(otherdest) + + if o == ORD_EQUAL: + selfsrc = next(filter(lambda a : type(a) == IpRule and a.ty == "saddr", self.action), None) + othersrc = next(filter(lambda a : type(a) == IpRule and a.ty == "saddr", self.action), None) + if selfsrc is not None and othersrc is None: + return True + elif selfsrc is None and othersrc is not None: + return False + elif selfsrc is not None and othersrc is not None: + o = selfsrc.ord(othersrc) + + if o == ORD_LESS: + return True + return self.action < other.action + + def maybe_join(self, neighbor): + if self.ty == RuleAction.CONDITIONS and neighbor.ty == RuleAction.CONDITIONS: + overlapping_conditions = [x for x in self.action if x in neighbor.action] + if len(overlapping_conditions) != 0: + us = RuleNode(RuleAction.CONDITIONS, [x for x in self.action if x not in overlapping_conditions], self.inner) + them = RuleNode(RuleAction.CONDITIONS, [x for x in neighbor.action if x not in overlapping_conditions], neighbor.inner) + self.action = overlapping_conditions + if self.inner.ty == RuleAction.LIST and us.action == []: + self.inner.inner.append(them) + else: + self.inner = RuleNode(RuleAction.LIST, None, [us, them]) + self.inner.flatten() + return True + return False + + def flatten(self): + # LLVM can be pretty bad at optimizing out common subexpressions. Thus, we have to do a + # pass here to toptimize out common subexpressions in back-to-back rules. + # See https://bugs.llvm.org/show_bug.cgi?id=52455 + assert self.ty == RuleAction.LIST + did_update = True + while did_update: + did_update = False + for i in range(0, len(self.inner) - 1): + if self.inner[i].maybe_join(self.inner[i + 1]): + del self.inner[i + 1] + did_update = True + break + + def write(self, out, pfx="\t"): + if self.ty == RuleAction.CONDITIONS: + out.write(pfx + "do {\\\n") + for cond in self.action: + out.write("\t" + pfx + str(cond).replace("\n", " \\\n\t" + pfx) + " \\\n") + self.inner.write(out, pfx) + out.write(pfx + "} while(0);\\\n") + elif self.ty == RuleAction.LIST: + for item in self.inner: + item.write(out, pfx + "\t") + else: + out.write("\t" + pfx + self.action.strip().replace("\n", " \\\n\t" + pfx) + " \\\n") + with open("rules.h", "w") as out: parse = argparse.ArgumentParser() parse.add_argument("--ihl", dest="ihl", required=True, choices=["drop-options","accept-options","parse-options"]) @@ -283,86 +428,228 @@ with open("rules.h", "w") as out: assert False out.write("#define REQ_8021Q " + args.vlan_tag + "\n") - rules6 = "" - rules4 = "" + rules6 = [] + rules4 = [] use_v6_frags = False - rulecnt = 0 + stats_rulecnt = 0 + ratelimitcnt = 0 + v4persrcratelimits = [] + v5persrcratelimits = [] + v6persrcratelimits = [] + lastrule = None for line in sys.stdin.readlines(): - t = line.split("{") - if len(t) != 2: - continue - if t[0].strip() == "flow4": - proto = 4 - rules4 += "\tdo {\\\n" - elif t[0].strip() == "flow6": - proto = 6 - rules6 += "\tdo {\\\n" - else: + if "{" in line: + if lastrule is not None: + print("Skipped rule due to lack of understood community tag: " + lastrule) + lastrule = line continue - - def write_rule(r): - global rules4, rules6 - if proto == 6: - rules6 += "\t\t" + r.replace("\n", " \\\n\t\t") + " \\\n" + if "BGP.ext_community: " in line: + assert lastrule is not None + + t = lastrule.split("{") + if t[0].strip() == "flow4": + proto = 4 + elif t[0].strip() == "flow6": + proto = 6 else: - rules4 += "\t\t" + r.replace("\n", " \\\n\t\t") + " \\\n" - - rule = t[1].split("}")[0].strip() - for step in rule.split(";"): - if step.strip().startswith("src") or step.strip().startswith("dst"): - nets = step.strip()[3:].strip().split(" ") - if len(nets) > 1: - assert nets[1] == "offset" - offset = nets[2] + continue + + conditions = [] + def write_rule(r): + global conditions + conditions.append(r) + + rule = t[1].split("}")[0].strip() + for step in rule.split(";"): + if step.strip().startswith("src") or step.strip().startswith("dst"): + nets = step.strip()[3:].strip().split(" ") + if len(nets) > 1: + assert nets[1] == "offset" + offset = nets[2] + else: + offset = None + if step.strip().startswith("src"): + write_rule(ip_to_rule(proto, nets[0], "saddr", offset)) + else: + write_rule(ip_to_rule(proto, nets[0], "daddr", offset)) + elif step.strip().startswith("proto") and proto == 4: + write_rule(proto_to_rule(4, step.strip()[6:])) + elif step.strip().startswith("next header") and proto == 6: + write_rule(proto_to_rule(6, step.strip()[12:])) + elif step.strip().startswith("icmp type"): + write_rule(icmp_type_to_rule(proto, step.strip()[10:])) + elif step.strip().startswith("icmp code"): + write_rule(icmp_code_to_rule(proto, step.strip()[10:])) + elif step.strip().startswith("sport") or step.strip().startswith("dport") or step.strip().startswith("port"): + write_rule(port_to_rule(step.strip().split(" ")[0], step.strip().split(" ", 1)[1])) + elif step.strip().startswith("length"): + write_rule(len_to_rule(step.strip()[7:])) + elif step.strip().startswith("dscp"): + write_rule(dscp_to_rule(proto, step.strip()[5:])) + elif step.strip().startswith("tcp flags"): + write_rule(tcp_flags_to_rule(step.strip()[10:])) + elif step.strip().startswith("label"): + write_rule(flow_label_to_rule(step.strip()[6:])) + elif step.strip().startswith("fragment"): + if proto == 6: + use_v6_frags = True + write_rule(fragment_to_rule(proto, step.strip()[9:])) + elif step.strip() == "": + pass else: - offset = None - if step.strip().startswith("src"): - write_rule(ip_to_rule(proto, nets[0], "saddr", offset)) - else: - write_rule(ip_to_rule(proto, nets[0], "daddr", offset)) - elif step.strip().startswith("proto") and proto == 4: - write_rule(proto_to_rule(4, step.strip()[6:])) - elif step.strip().startswith("next header") and proto == 6: - write_rule(proto_to_rule(6, step.strip()[12:])) - elif step.strip().startswith("icmp type"): - write_rule(icmp_type_to_rule(proto, step.strip()[10:])) - elif step.strip().startswith("icmp code"): - write_rule(icmp_code_to_rule(proto, step.strip()[10:])) - elif step.strip().startswith("sport") or step.strip().startswith("dport") or step.strip().startswith("port"): - write_rule(port_to_rule(step.strip().split(" ")[0], step.strip().split(" ", 1)[1])) - elif step.strip().startswith("length"): - write_rule(len_to_rule(step.strip()[7:])) - elif step.strip().startswith("dscp"): - write_rule(dscp_to_rule(proto, step.strip()[5:])) - elif step.strip().startswith("tcp flags"): - write_rule(tcp_flags_to_rule(step.strip()[10:])) - elif step.strip().startswith("label"): - write_rule(flow_label_to_rule(step.strip()[6:])) - elif step.strip().startswith("fragment"): - if proto == 6: - use_v6_frags = True - write_rule(fragment_to_rule(proto, step.strip()[9:])) - elif step.strip() == "": - pass + assert False + + actions = "" + def write_rule(r): + global actions + actions += r + "\n" + + # Now write the match handling! + first_action = None + stats_action = "" + last_action = None + for community in line.split("("): + if not community.startswith("generic, "): + continue + blocks = community.split(",") + assert len(blocks) == 3 + if len(blocks[1].strip()) != 10: # Should be 0x12345678 + continue + ty = blocks[1].strip()[:6] + 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: + # Two ratelimit actions, just drop the old one. RFC 8955 says we can. + first_action = None + exp = (low_bytes & (0xff << 23)) >> 23 + if low_bytes == 0: + first_action = "{stats_replace}\nreturn XDP_DROP;" + elif low_bytes & (1 << 31) != 0: + # Negative limit, just drop + first_action = "{stats_replace}\nreturn XDP_DROP;" + elif exp == 0xff: + # NaN/INF. Just treat as INF and accept + first_action = None + elif exp < 127: # < 1 + first_action = "{stats_replace}\nreturn XDP_DROP;" + elif exp >= 127 + 29: # We can't handle the precision required with ns this high + first_action = None + else: + mantissa = low_bytes & ((1 << 23) - 1) + value = 1.0 + mantissa / (2**23) + value *= 2**(exp-127) + + first_action = "int64_t time_masked = bpf_ktime_get_ns() & RATE_TIME_MASK;\n" + first_action += f"int64_t per_pkt_ns = (1000000000LL << RATE_BUCKET_INTEGER_BITS) / {math.floor(value)};\n" + if ty == "0x8006" or ty == "0x8306": + first_action += "uint64_t amt = data_end - pktdata;\n" + else: + first_action += "uint64_t amt = 1;\n" + if ty == "0x8006" or ty == "0x800c": + first_action += f"const uint32_t ratelimitidx = {ratelimitcnt};\n" + first_action += "struct ratelimit *rate = bpf_map_lookup_elem(&rate_map, &ratelimitidx);\n" + ratelimitcnt += 1 + first_action += "int matched = 0;\n" + first_action += "DO_RATE_LIMIT(bpf_spin_lock(&rate->lock), rate, time_masked, amt, per_pkt_ns, matched);\n" + first_action += "if (rate) { bpf_spin_unlock(&rate->lock); }\n" + else: + if proto == 4: + if mid_byte > 32: + continue + 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"int matched = check_v4_persrc_ratelimit(srcip, rate_map, {(high_byte + 1) * 4096}, time_masked, amt, per_pkt_ns);\n" + v4persrcratelimits.append((high_byte + 1) * 4096) + elif mid_byte <= 64: + first_action += f"const uint64_t srcip = BE128BEHIGH64(ip6->saddr & MASK6({mid_byte}));\n" + first_action += f"void *rate_map = &v5_src_rate_{len(v5persrcratelimits)};\n" + first_action += f"int matched = check_v5_persrc_ratelimit(srcip, rate_map, {(high_byte + 1) * 4096}, time_masked, amt, per_pkt_ns);\n" + v5persrcratelimits.append((high_byte + 1) * 4096) + else: + if mid_byte > 128: + continue + 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"int matched = check_v6_persrc_ratelimit(srcip, rate_map, {(high_byte + 1) * 4096}, time_masked, amt, per_pkt_ns);\n" + v6persrcratelimits.append((high_byte + 1) * 4096) + first_action += "if (matched) {\n" + first_action += "\t{stats_replace}\n" + first_action += "\treturn XDP_DROP;\n" + first_action += "}\n" + elif ty == "0x8007": + if low_bytes & 1 == 0: + last_action = "return XDP_PASS;" + if low_bytes & 2 == 2: + stats_action = f"const uint32_t ruleidx = STATIC_RULE_CNT + {stats_rulecnt};\n" + stats_action += "INCREMENT_MATCH(ruleidx);" + elif ty == "0x8008": + assert False # We do not implement the redirect action + elif ty == "0x8009": + if low_bytes & ~0b111111 != 0: + assert False # Invalid DSCP value + if proto == 4: + write_rule("int32_t chk = ~BE16(ip->check) & 0xffff;") + write_rule("uint8_t orig_tos = ip->tos;") + write_rule("ip->tos = (ip->tos & 3) | " + str(low_bytes << 2) + ";") + write_rule("chk = (chk - orig_tos + ip->tos);") + write_rule("if (unlikely(chk > 0xffff)) { chk -= 65535; }") + write_rule("else if (unlikely(chk < 0)) { chk += 65535; }") + write_rule("ip->check = ~BE16(chk);") + else: + write_rule("ip6->priority = " + str(low_bytes >> 2) + ";") + write_rule("ip6->flow_lbl[0] = (ip6->flow_lbl[0] & 0x3f) | " + str((low_bytes & 3) << 6) + ";") + if first_action is not None: + write_rule(first_action.replace("{stats_replace}", stats_action)) + if stats_action != "" and (first_action is None or "{stats_replace}" not in first_action): + write_rule(stats_action) + if last_action is not None: + write_rule(last_action) + if proto == 6: + rules6.append(RuleNode(RuleAction.CONDITIONS, conditions, RuleNode(RuleAction.ACTION, actions, None))) else: - assert False - write_rule(f"const uint32_t ruleidx = STATIC_RULE_CNT + {rulecnt};") - write_rule("DO_RETURN(ruleidx, XDP_DROP);") - if proto == 6: - rules6 += "\t} while(0);\\\n" - else: - rules4 += "\t} while(0);\\\n" - rulecnt += 1 + rules4.append(RuleNode(RuleAction.CONDITIONS, conditions, RuleNode(RuleAction.ACTION, actions, None))) + if stats_action != "": + print(rule) + stats_rulecnt += 1 + lastrule = None out.write("\n") - out.write(f"#define RULECNT {rulecnt}\n") - if rules4 != "": + out.write(f"#define STATS_RULECNT {stats_rulecnt}\n") + if ratelimitcnt != 0: + out.write(f"#define RATE_CNT {ratelimitcnt}\n") + + if len(rules4) != 0: out.write("#define NEED_V4_PARSE\n") - out.write("#define RULES4 {\\\n" + rules4 + "}\n") - if rules6: + out.write("#define RULES4 {\\\n") + # First sort the rules according to the RFC, then make it a single + # LIST rule and call flatten() to unify redundant conditions + rules4.sort() + rules4 = RuleNode(RuleAction.LIST, None, rules4) + rules4.flatten() + rules4.write(out) + out.write("}\n") + + if len(rules6) != 0: out.write("#define NEED_V6_PARSE\n") - out.write("#define RULES6 {\\\n" + rules6 + "}\n") + out.write("#define RULES6 {\\\n") + # First sort the rules according to the RFC, then make it a single + # LIST rule and call flatten() to unify redundant conditions + rules6.sort() + rules6 = RuleNode(RuleAction.LIST, None, rules6) + rules6.flatten() + rules6.write(out) + out.write("}\n") + 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(v5persrcratelimits): + out.write(f"SRC_RATE_DEFINE(5, {idx}, {limit})\n") + for idx, limit in enumerate(v6persrcratelimits): + out.write(f"SRC_RATE_DEFINE(6, {idx}, {limit})\n")