ipfw_keepalive_more
struct netmsg_base ipfw_keepalive_more;
struct netmsg_base *nm = &ctx->ipfw_keepalive_more;
ipfw_keepalive_more(ctx);
ipfw_keepalive_more(ctx);
ipfw_keepalive_more(ctx);
netmsg_init(&ctx->ipfw_keepalive_more, NULL, &netisr_adone_rport,
netisr_dropmsg(&ctx->ipfw_keepalive_more);