diff options
Diffstat (limited to 'iptables')
| -rw-r--r-- | iptables/nft.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/iptables/nft.c b/iptables/nft.c index 83cf5fb7..599c2f7e 100644 --- a/iptables/nft.c +++ b/iptables/nft.c @@ -2897,6 +2897,44 @@ const char *nft_strerror(int err) return strerror(err); } +static int recover_rule_compat(struct nftnl_rule *r) +{ + struct nftnl_expr_iter *iter; + struct nftnl_expr *e; + uint32_t reg; + int ret = -1; + + iter = nftnl_expr_iter_create(r); + if (!iter) + return -1; + +next_expr: + e = nftnl_expr_iter_next(iter); + 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) + goto next_expr; + + reg = nftnl_expr_get_u32(e, NFTNL_EXPR_META_DREG); + + e = nftnl_expr_iter_next(iter); + if (!e) + goto out; + + if (strcmp("cmp", nftnl_expr_get_str(e, NFTNL_EXPR_NAME)) || + reg != nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_SREG)) + goto next_expr; + + add_compat(r, nftnl_expr_get_u8(e, NFTNL_EXPR_CMP_DATA), + nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP) == NFT_CMP_NEQ); + ret = 0; +out: + nftnl_expr_iter_destroy(iter); + return ret; +} + struct chain_zero_data { struct nft_handle *handle; bool verbose; @@ -2961,6 +2999,7 @@ static int __nft_chain_zero_counters(struct nftnl_chain *c, void *data) * Unset RULE_POSITION for older kernels, we want to replace * rule based on its handle only. */ + recover_rule_compat(r); nftnl_rule_unset(r, NFTNL_RULE_POSITION); if (!batch_rule_add(h, NFT_COMPAT_RULE_REPLACE, r)) { nftnl_rule_iter_destroy(iter); |