diff options
| -rw-r--r-- | iptables/nft.c | 27 | ||||
| -rwxr-xr-x | iptables/tests/shell/testcases/nft-only/0011-zero-needs-compat_0 | 12 |
2 files changed, 35 insertions, 4 deletions
diff --git a/iptables/nft.c b/iptables/nft.c index dae6698d..ee63c3dc 100644 --- a/iptables/nft.c +++ b/iptables/nft.c @@ -3750,6 +3750,27 @@ const char *nft_strerror(int err) return strerror(err); } +static int l4proto_expr_get_dreg(struct nftnl_expr *e, uint32_t *dregp) +{ + const char *name = nftnl_expr_get_str(e, NFTNL_EXPR_NAME); + uint32_t poff = offsetof(struct iphdr, protocol); + uint32_t pbase = NFT_PAYLOAD_NETWORK_HEADER; + + if (!strcmp(name, "payload") && + nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_BASE) == pbase && + nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_OFFSET) == poff && + nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_LEN) == sizeof(uint8_t)) { + *dregp = nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_DREG); + return 0; + } + if (!strcmp(name, "meta") && + nftnl_expr_get_u32(e, NFTNL_EXPR_META_KEY) == NFT_META_L4PROTO) { + *dregp = nftnl_expr_get_u32(e, NFTNL_EXPR_META_DREG); + return 0; + } + return -1; +} + static int recover_rule_compat(struct nftnl_rule *r) { struct nftnl_expr_iter *iter; @@ -3766,12 +3787,10 @@ next_expr: if (!e) goto out; - if (strcmp("meta", nftnl_expr_get_str(e, NFTNL_EXPR_NAME)) || - nftnl_expr_get_u32(e, NFTNL_EXPR_META_KEY) != NFT_META_L4PROTO) + /* may be 'ip protocol' or 'meta l4proto' with identical RHS */ + if (l4proto_expr_get_dreg(e, ®) < 0) goto next_expr; - reg = nftnl_expr_get_u32(e, NFTNL_EXPR_META_DREG); - e = nftnl_expr_iter_next(iter); if (!e) goto out; diff --git a/iptables/tests/shell/testcases/nft-only/0011-zero-needs-compat_0 b/iptables/tests/shell/testcases/nft-only/0011-zero-needs-compat_0 new file mode 100755 index 00000000..e276a953 --- /dev/null +++ b/iptables/tests/shell/testcases/nft-only/0011-zero-needs-compat_0 @@ -0,0 +1,12 @@ +#!/bin/bash + +[[ $XT_MULTI == *xtables-nft-multi ]] || { echo "skip $XT_MULTI"; exit 0; } + +set -e + +rule="-p tcp -m tcp --dport 27374 -c 23 42 -j TPROXY --on-port 50080" +for cmd in iptables ip6tables; do + $XT_MULTI $cmd -t mangle -A PREROUTING $rule + $XT_MULTI $cmd -t mangle -Z + $XT_MULTI $cmd -t mangle -v -S | grep -q -- "${rule/23 42/0 0}" +done |