This is the relevant line where I build my header: nlh = nftnl_rule_nlmsg_build_hdr(mnl_nlmsg_batch_current(batch), NFT_MSG_NEWRULE, family, NLM_F_APPEND | NLM_F_EXCL | NLM_F_CREATE | NLM_F_ECHO | NLM_F_ACK, seq++); If I remove NLM_F_ECHO, it fixes my issue, but I would prefer to keep this unless there is a better way to get the created rule's handle. I also set the handle directly: mnl_attr_put_u64(nlh, NFTNL_RULE_POSITION, htobe64(handle)); On Wed, Jun 22, 2022 at 3:36 AM Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> wrote: > > On Tue, Jun 21, 2022 at 08:07:24PM +0000, Kiernan George wrote: > > Hi, > > > > I am getting an ABI breakage error at these lines in rule.c: > > > > case NFTA_RULE_HANDLE: > > if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0) > > abi_breakage(); > > break; > > > > It only seems to happen when I set the flag NLM_F_ECHO in > > nftnl_rule_nlmsg_build_hdr. I want to hold onto the rule handle of the > > returned rule, which is why I set it to echo. This error was not affecting > > me in Ubuntu 20.04, but started as soon as I upgraded to 22.04. I am running > > Linux kernel version 5.15.0-39-generic with libnftnl-dev version > > 1.2.1-1build1. > > That's very strange. Could you post a sample code?
