static int chain_cb(const struct nlmsghdr *nlh, int event, struct callback_data *cb) { struct nftnl_chain *chain; chain = nftnl_chain_alloc(); if (!chain) return MNL_CB_OK; if (nftnl_chain_nlmsg_parse(nlh, chain) < 0) goto out; switch (cb->type) { case CALLBACK_RETURN_HANDLE: cb->value = nftnl_chain_get_u64(chain, NFTNL_CHAIN_HANDLE); cb->success = true; break; default: DBG("unhandled callback type %d\n", cb->type); break; } out: nftnl_chain_free(chain); return MNL_CB_OK; }
int main(int argc, char *argv[]) { struct nftnl_chain *a, *b; char buf[4096]; struct nlmsghdr *nlh; a = nftnl_chain_alloc(); b = nftnl_chain_alloc(); if (a == NULL || b == NULL) print_err("OOM"); nftnl_chain_set_str(a, NFTNL_CHAIN_NAME, "test"); nftnl_chain_set_u32(a, NFTNL_CHAIN_FAMILY, AF_INET); nftnl_chain_set_str(a, NFTNL_CHAIN_TABLE, "Table"); nftnl_chain_set_u32(a, NFTNL_CHAIN_POLICY,0x12345678); nftnl_chain_set_u32(a, NFTNL_CHAIN_HOOKNUM, 0x34567812); nftnl_chain_set_s32(a, NFTNL_CHAIN_PRIO, 0x56781234); nftnl_chain_set_u32(a, NFTNL_CHAIN_USE, 0x78123456); nftnl_chain_set_u64(a, NFTNL_CHAIN_PACKETS, 0x1234567812345678); nftnl_chain_set_u64(a, NFTNL_CHAIN_BYTES, 0x7812345678123456); nftnl_chain_set_u64(a, NFTNL_CHAIN_HANDLE, 0x5678123456781234); nftnl_chain_set_str(a, NFTNL_CHAIN_TYPE, "Prueba"); nftnl_chain_set_str(a, NFTNL_CHAIN_DEV, "eth0"); /* cmd extracted from include/linux/netfilter/nf_tables.h */ nlh = nftnl_chain_nlmsg_build_hdr(buf, NFT_MSG_NEWCHAIN, AF_INET, 0, 1234); nftnl_chain_nlmsg_build_payload(nlh, a); if (nftnl_chain_nlmsg_parse(nlh, b) < 0) print_err("parsing problems"); cmp_nftnl_chain(a, b); nftnl_chain_free(a); nftnl_chain_free(b); if (!test_ok) exit(EXIT_FAILURE); printf("%s: \033[32mOK\e[0m\n", argv[0]); return EXIT_SUCCESS; }