XT_STRING_MAX_ALGO_NAME_SIZE 16 include/linux/netfilter/xt_string.h char algo[XT_STRING_MAX_ALGO_NAME_SIZE]; XT_STRING_MAX_ALGO_NAME_SIZE 7 include/linux/netfilter_ipv4/ipt_string.h #define IPT_STRING_MAX_ALGO_NAME_SIZE XT_STRING_MAX_ALGO_NAME_SIZE XT_STRING_MAX_ALGO_NAME_SIZE 52 net/netfilter/xt_string.c if (conf->algo[XT_STRING_MAX_ALGO_NAME_SIZE - 1] != '\0')