From: Matt Corallo Date: Sat, 3 Apr 2021 22:08:01 +0000 (-0400) Subject: Improve arg parsing somewhat and add flexibility/standardness X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=b4fab99915a43a095829b2b117947f49b266b4e2;p=flowspec-xdp Improve arg parsing somewhat and add flexibility/standardness --- diff --git a/genrules.py b/genrules.py index d372806..c0a5311 100755 --- a/genrules.py +++ b/genrules.py @@ -3,17 +3,14 @@ import sys import ipaddress from enum import Enum +import argparse + IP_PROTO_ICMP = 1 IP_PROTO_ICMPV6 = 58 IP_PROTO_TCP = 6 IP_PROTO_UDP = 17 -if len(sys.argv) > 2 and sys.argv[2].startswith("parse_ihl"): - PARSE_IHL = True -else: - PARSE_IHL = False - class ASTAction(Enum): OR = 1, AND = 2, @@ -239,12 +236,30 @@ def flow_label_to_rule(rules): 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;""" with open("rules.h", "w") as out: - if len(sys.argv) > 1 and sys.argv[1] == "parse_8021q": - out.write("#define PARSE_8021Q\n") - if len(sys.argv) > 1 and sys.argv[1].startswith("req_8021q="): - out.write("#define PARSE_8021Q\n") - out.write(f"#define REQ_8021Q {sys.argv[1][10:]}\n") - + parse = argparse.ArgumentParser() + parse.add_argument("--ihl", dest="ihl", required=True, choices=["drop-options","accept-options","parse-options"]) + parse.add_argument("--8021q", dest="vlan", required=True, choices=["drop-vlan","accept-vlan","parse-vlan"]) + parse.add_argument("--require-8021q", dest="vlan_tag") + args = parse.parse_args(sys.argv[1:]) + + if args.ihl == "drop-options": + out.write("#define PARSE_IHL XDP_DROP\n") + elif args.ihl == "accept-options": + out.write("#define PARSE_IHL XDP_PASS\n") + elif args.ihl == "parse-options": + out.write("#define PARSE_IHL PARSE\n") + + if args.vlan == "drop-vlan": + out.write("#define PARSE_8021Q XDP_DROP\n") + elif args.vlan == "accept-vlan": + out.write("#define PARSE_8021Q XDP_PASS\n") + elif args.vlan == "parse-vlan": + out.write("#define PARSE_8021Q PARSE\n") + + if args.vlan_tag is not None: + if args.vlan != "parse-vlan": + assert False + out.write("#define REQ_8021Q " + args.vlan_tag + "\n") out.write("#define RULES \\\n") diff --git a/test.sh b/test.sh index bbb38dd..f25fffa 100755 --- a/test.sh +++ b/test.sh @@ -15,33 +15,33 @@ TEST_PKT='#define TEST \ "\xb5\xc3\xa9\xa6\x21\x14\xc7\xd9\x71\x07"' # Test all the things... -echo "flow4 { src 72.229.104.206/32; dst 103.99.170.10/32; proto = 17; sport = 56733; dport = 4242; length = 140; dscp 0/0xff; fragment !dont_fragment && !is_fragment && !first_fragment && !last_fragment };" | ./genrules.py +echo "flow4 { src 72.229.104.206/32; dst 103.99.170.10/32; proto = 17; sport = 56733; dport = 4242; length = 140; dscp 0/0xff; fragment !dont_fragment && !is_fragment && !first_fragment && !last_fragment };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { port = 4242; icmp code = 0; };" | ./genrules.py +echo "flow4 { port = 4242; icmp code = 0; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp # Some port tests... -echo "flow4 { port = 4242 && = 56733; };" | ./genrules.py +echo "flow4 { port = 4242 && = 56733; };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { port = 4242 || 1; sport = 56733 };" | ./genrules.py +echo "flow4 { port = 4242 || 1; sport = 56733 };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { port = 4242 && 1 };" | ./genrules.py +echo "flow4 { port = 4242 && 1 };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { icmp code != 0; };" | ./genrules.py parse_8021q +echo "flow4 { icmp code != 0; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp @@ -55,17 +55,17 @@ TEST_PKT='#define TEST \ "\x75\xde\xeb\x22\xd6\x80"' # Some v6 TCP tests... -echo "flow6 { src 2a01:4f8:130:71d2::2/128; dst 2620:6e:a000:2001::6/128; next header 6; port 8333 && 49778; tcp flags 0x010/0xfff;};" | ./genrules.py +echo "flow6 { src 2a01:4f8:130:71d2::2/128; dst 2620:6e:a000:2001::6/128; next header 6; port 8333 && 49778; tcp flags 0x010/0xfff;};" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { src 0:4f8:130:71d2::2/128 offset 16; dst 0:0:a000:2001::/64 offset 32; next header 6; port 8333 && 49778; tcp flags 0x010/0xfff;};" | ./genrules.py +echo "flow6 { src 0:4f8:130:71d2::2/128 offset 16; dst 0:0:a000:2001::/64 offset 32; next header 6; port 8333 && 49778; tcp flags 0x010/0xfff;};" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { icmp code != 0; };" | ./genrules.py +echo "flow6 { icmp code != 0; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp @@ -80,41 +80,53 @@ TEST_PKT='#define TEST \ "\x32\x33\x34\x35\x36\x37"' # ICMP and VLAN tests -echo "flow4 { src 10.0.0.0/8; dst 209.250.0.0/16; proto = 1; icmp type 8; icmp code >= 0; length < 100; fragment dont_fragment; };" | ./genrules.py parse_8021q +echo "flow4 { src 10.0.0.0/8; dst 209.250.0.0/16; proto = 1; icmp type 8; icmp code >= 0; length < 100; fragment dont_fragment; };" | ./genrules.py --ihl=accept-options --8021q=parse-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { icmp type 8; icmp code > 0; };" | ./genrules.py parse_8021q +echo "flow4 { icmp type 8; icmp code > 0; };" | ./genrules.py --ihl=drop-options --8021q=parse-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { icmp type 9; };" | ./genrules.py parse_8021q +echo "flow4 { icmp type 9; };" | ./genrules.py --ihl=drop-options --8021q=parse-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { src 10.0.0.0/8; dst 209.250.0.0/16; proto = 1; icmp type 8; icmp code >= 0; length < 100; fragment dont_fragment; };" | ./genrules.py req_8021q=3 +echo "flow4 { src 10.0.0.0/8; dst 209.250.0.0/16; proto = 1; icmp type 8; icmp code >= 0; length < 100; fragment dont_fragment; };" | ./genrules.py --ihl=accept-options --8021q=parse-vlan --require-8021q=3 echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { src 0.0.0.0/32; };" | ./genrules.py req_8021q=4 +echo "flow4 { src 0.0.0.0/32; };" | ./genrules.py --ihl=accept-options --8021q=parse-vlan --require-8021q=4 echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { src 0.0.0.0/32; };" | ./genrules.py req_8021q=3 +echo "flow4 { src 0.0.0.0/32; };" | ./genrules.py --ihl=drop-options --8021q=parse-vlan --require-8021q=3 echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow4 { port 42; };" | ./genrules.py parse_8021q +echo "flow4 { port 42; };" | ./genrules.py --ihl=drop-options --8021q=parse-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp +# Test --8021q option handling +echo "flow4 { port 42; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan --v6frag=drop-frags +echo "$TEST_PKT" >> rules.h +echo "#define TEST_EXP XDP_DROP" >> rules.h +clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp + +echo "flow4 { };" | ./genrules.py --ihl=drop-options --8021q=accept-vlan --v6frag=drop-frags +echo "$TEST_PKT" >> rules.h +echo "#define TEST_EXP XDP_PASS" >> rules.h +clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp + + TEST_PKT='#define TEST \ "\x00\x0d\xb9\x50\x11\x4c\x00\x17\x10\x95\xe8\x96\x86\xdd\x60\x0a" \ "\xb8\x00\x00\x40\x3a\x3e\x20\x01\x04\x70\x00\x00\x02\xc8\x00\x00" \ @@ -126,27 +138,27 @@ TEST_PKT='#define TEST \ "\x00\x00\x00\x00\x00\x00"' # ICMPv6 tests -echo "flow6 { icmp type 129; icmp code 0; };" | ./genrules.py +echo "flow6 { icmp type 129; icmp code 0; };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { icmp code != 0; };" | ./genrules.py +echo "flow6 { icmp code != 0; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { tcp flags 0x0/0x0; };" | ./genrules.py +echo "flow6 { tcp flags 0x0/0x0; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { port 42; };" | ./genrules.py +echo "flow6 { port 42; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { fragment is_fragment || first_fragment || last_fragment; };" | ./genrules.py +echo "flow6 { fragment is_fragment || first_fragment || last_fragment; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp @@ -164,23 +176,23 @@ TEST_PKT='#define TEST \ # Last frag ICMPv6 tests -echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment is_fragment && !first_fragment && last_fragment; };" | ./genrules.py +echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment is_fragment && !first_fragment && last_fragment; };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment; };" | ./genrules.py +echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment || first_fragment || !last_fragment; };" | ./genrules.py +echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment || first_fragment || !last_fragment; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp #TODO Is nextheader frag correct to match on here? Should we support matching on any nexthdr? -echo "flow6 { next header 44; };" | ./genrules.py +echo "flow6 { next header 44; };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp @@ -270,34 +282,34 @@ TEST_PKT='#define TEST \ # First frag ICMPv6 tests -echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment is_fragment && first_fragment && !last_fragment; };" | ./genrules.py +echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment is_fragment && first_fragment && !last_fragment; };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment; };" | ./genrules.py +echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment || !first_fragment || last_fragment; };" | ./genrules.py +echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment !is_fragment || !first_fragment || last_fragment; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp -echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment is_fragment && first_fragment && !last_fragment; icmp code 0; icmp type 128 };" | ./genrules.py +echo "flow6 { src 2620:6e:a007:233::1/128; dst 2001:470:0:503::2/128; fragment is_fragment && first_fragment && !last_fragment; icmp code 0; icmp type 128 };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp #TODO Is nextheader frag correct to match on here? Should we support matching on any nexthdr? -echo "flow6 { next header 44; };" | ./genrules.py +echo "flow6 { next header 44; };" | ./genrules.py --ihl=accept-options --8021q=accept-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_DROP" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp #TODO Is nextheader frag correct to match on here? Should we support matching on any nexthdr? -echo "flow6 { next header 58; };" | ./genrules.py +echo "flow6 { next header 58; };" | ./genrules.py --ihl=drop-options --8021q=drop-vlan echo "$TEST_PKT" >> rules.h echo "#define TEST_EXP XDP_PASS" >> rules.h clang -std=c99 -fsanitize=address -pedantic -Wall -Wextra -Wno-pointer-arith -Wno-unused-variable -O0 -g xdp.c -o xdp && ./xdp diff --git a/xdp.c b/xdp.c index 26a1231..669d3eb 100644 --- a/xdp.c +++ b/xdp.c @@ -104,8 +104,8 @@ struct tcphdr { #define MASK6(pfxlen) HTON128(~((((uint128_t)1) << (128 - pfxlen)) - 1)) #define MASK6_OFFS(offs, pfxlen) HTON128((~((((uint128_t)1) << (128 - pfxlen)) - 1)) & ((((uint128_t)1) << (128 - offs)) - 1)) -// Note rules.h may also define PARSE_8021Q and REQ_8021Q -// Note rules.h may also define PARSE_IHL +// PARSE is used as a preprocessor flag to indicate parsing fields +#define PARSE 42 #include "rules.h" #define unlikely(a) __builtin_expect(a, 0) @@ -143,7 +143,7 @@ int xdp_drop_prog(struct xdp_md *ctx) return XDP_DROP; const struct ethhdr *const eth = (void*)(size_t)ctx->data; -#ifdef PARSE_8021Q +#if PARSE_8021Q == PARSE if (likely(eth->h_proto == BE16(ETH_P_8021Q))) { if (unlikely((void*)(size_t)ctx->data + sizeof(struct ethhdr_vlan) > data_end)) return XDP_DROP; @@ -156,6 +156,10 @@ int xdp_drop_prog(struct xdp_md *ctx) eth_proto = eth_vlan->h_proto; pktdata = (const void *)(long)ctx->data + sizeof(struct ethhdr_vlan); +#else + if (unlikely(eth->h_proto == BE16(ETH_P_8021Q))) { + return PARSE_8021Q; +#endif } else { #ifdef REQ_8021Q return XDP_DROP; @@ -164,10 +168,6 @@ int xdp_drop_prog(struct xdp_md *ctx) eth_proto = eth->h_proto; #endif } -#else - pktdata = (const void *)(long)ctx->data + sizeof(struct ethhdr); - eth_proto = eth->h_proto; -#endif } const struct tcphdr *tcp = NULL; @@ -183,13 +183,14 @@ int xdp_drop_prog(struct xdp_md *ctx) return XDP_DROP; ip = (struct iphdr*) pktdata; -#ifdef PARSE_IHL +#if PARSE_IHL == PARSE if (unlikely(ip->ihl < 5)) return XDP_DROP; l4hdr = pktdata + ip->ihl * 4; #else - if (ip->ihl != 5) return XDP_DROP; + if (ip->ihl != 5) return PARSE_IHL; l4hdr = pktdata + 5*4; #endif + if (ip->protocol == IP_PROTO_TCP) { if (unlikely(l4hdr + sizeof(struct tcphdr) > data_end)) return XDP_DROP;