MAX_INET_PROTOS
extern struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS];
extern struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS];
extern const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS];
extern const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS];
protocol < MAX_INET_PROTOS &&
struct net_protocol __rcu *inet_protos[MAX_INET_PROTOS] __read_mostly;
const struct net_offload __rcu *inet_offloads[MAX_INET_PROTOS] __read_mostly;
struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
const struct net_offload __rcu *inet6_offloads[MAX_INET_PROTOS] __read_mostly;