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757 lines
18 KiB
757 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
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*/ |
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#include <linux/bpf.h> |
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#include <linux/rcupdate.h> |
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#include <linux/random.h> |
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#include <linux/smp.h> |
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#include <linux/topology.h> |
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#include <linux/ktime.h> |
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#include <linux/sched.h> |
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#include <linux/uidgid.h> |
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#include <linux/filter.h> |
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#include <linux/ctype.h> |
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#include <linux/jiffies.h> |
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#include <linux/pid_namespace.h> |
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#include <linux/proc_ns.h> |
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#include <linux/security.h> |
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#include "../../lib/kstrtox.h" |
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|
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/* If kernel subsystem is allowing eBPF programs to call this function, |
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* inside its own verifier_ops->get_func_proto() callback it should return |
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* bpf_map_lookup_elem_proto, so that verifier can properly check the arguments |
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* |
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* Different map implementations will rely on rcu in map methods |
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* lookup/update/delete, therefore eBPF programs must run under rcu lock |
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* if program is allowed to access maps, so check rcu_read_lock_held in |
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* all three functions. |
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*/ |
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BPF_CALL_2(bpf_map_lookup_elem, struct bpf_map *, map, void *, key) |
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{ |
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WARN_ON_ONCE(!rcu_read_lock_held()); |
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return (unsigned long) map->ops->map_lookup_elem(map, key); |
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} |
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const struct bpf_func_proto bpf_map_lookup_elem_proto = { |
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.func = bpf_map_lookup_elem, |
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.gpl_only = false, |
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.pkt_access = true, |
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.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL, |
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.arg1_type = ARG_CONST_MAP_PTR, |
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.arg2_type = ARG_PTR_TO_MAP_KEY, |
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}; |
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BPF_CALL_4(bpf_map_update_elem, struct bpf_map *, map, void *, key, |
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void *, value, u64, flags) |
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{ |
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WARN_ON_ONCE(!rcu_read_lock_held()); |
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return map->ops->map_update_elem(map, key, value, flags); |
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} |
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const struct bpf_func_proto bpf_map_update_elem_proto = { |
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.func = bpf_map_update_elem, |
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.gpl_only = false, |
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.pkt_access = true, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_CONST_MAP_PTR, |
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.arg2_type = ARG_PTR_TO_MAP_KEY, |
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.arg3_type = ARG_PTR_TO_MAP_VALUE, |
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.arg4_type = ARG_ANYTHING, |
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}; |
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BPF_CALL_2(bpf_map_delete_elem, struct bpf_map *, map, void *, key) |
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{ |
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WARN_ON_ONCE(!rcu_read_lock_held()); |
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return map->ops->map_delete_elem(map, key); |
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} |
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const struct bpf_func_proto bpf_map_delete_elem_proto = { |
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.func = bpf_map_delete_elem, |
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.gpl_only = false, |
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.pkt_access = true, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_CONST_MAP_PTR, |
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.arg2_type = ARG_PTR_TO_MAP_KEY, |
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}; |
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BPF_CALL_3(bpf_map_push_elem, struct bpf_map *, map, void *, value, u64, flags) |
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{ |
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return map->ops->map_push_elem(map, value, flags); |
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} |
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const struct bpf_func_proto bpf_map_push_elem_proto = { |
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.func = bpf_map_push_elem, |
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.gpl_only = false, |
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.pkt_access = true, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_CONST_MAP_PTR, |
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.arg2_type = ARG_PTR_TO_MAP_VALUE, |
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.arg3_type = ARG_ANYTHING, |
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}; |
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BPF_CALL_2(bpf_map_pop_elem, struct bpf_map *, map, void *, value) |
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{ |
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return map->ops->map_pop_elem(map, value); |
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} |
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const struct bpf_func_proto bpf_map_pop_elem_proto = { |
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.func = bpf_map_pop_elem, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_CONST_MAP_PTR, |
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.arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE, |
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}; |
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BPF_CALL_2(bpf_map_peek_elem, struct bpf_map *, map, void *, value) |
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{ |
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return map->ops->map_peek_elem(map, value); |
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} |
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const struct bpf_func_proto bpf_map_peek_elem_proto = { |
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.func = bpf_map_peek_elem, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_CONST_MAP_PTR, |
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.arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE, |
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}; |
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const struct bpf_func_proto bpf_get_prandom_u32_proto = { |
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.func = bpf_user_rnd_u32, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_0(bpf_get_smp_processor_id) |
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{ |
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return smp_processor_id(); |
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} |
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const struct bpf_func_proto bpf_get_smp_processor_id_proto = { |
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.func = bpf_get_smp_processor_id, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_0(bpf_get_numa_node_id) |
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{ |
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return numa_node_id(); |
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} |
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const struct bpf_func_proto bpf_get_numa_node_id_proto = { |
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.func = bpf_get_numa_node_id, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_0(bpf_ktime_get_ns) |
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{ |
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/* NMI safe access to clock monotonic */ |
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return ktime_get_mono_fast_ns(); |
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} |
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const struct bpf_func_proto bpf_ktime_get_ns_proto = { |
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.func = bpf_ktime_get_ns, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_0(bpf_ktime_get_boot_ns) |
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{ |
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/* NMI safe access to clock boottime */ |
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return ktime_get_boot_fast_ns(); |
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} |
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const struct bpf_func_proto bpf_ktime_get_boot_ns_proto = { |
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.func = bpf_ktime_get_boot_ns, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_0(bpf_ktime_get_coarse_ns) |
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{ |
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return ktime_get_coarse_ns(); |
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} |
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const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto = { |
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.func = bpf_ktime_get_coarse_ns, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_0(bpf_get_current_pid_tgid) |
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{ |
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struct task_struct *task = current; |
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if (unlikely(!task)) |
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return -EINVAL; |
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return (u64) task->tgid << 32 | task->pid; |
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} |
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const struct bpf_func_proto bpf_get_current_pid_tgid_proto = { |
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.func = bpf_get_current_pid_tgid, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_0(bpf_get_current_uid_gid) |
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{ |
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struct task_struct *task = current; |
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kuid_t uid; |
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kgid_t gid; |
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if (unlikely(!task)) |
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return -EINVAL; |
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current_uid_gid(&uid, &gid); |
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return (u64) from_kgid(&init_user_ns, gid) << 32 | |
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from_kuid(&init_user_ns, uid); |
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} |
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const struct bpf_func_proto bpf_get_current_uid_gid_proto = { |
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.func = bpf_get_current_uid_gid, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size) |
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{ |
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struct task_struct *task = current; |
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if (unlikely(!task)) |
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goto err_clear; |
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strncpy(buf, task->comm, size); |
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/* Verifier guarantees that size > 0. For task->comm exceeding |
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* size, guarantee that buf is %NUL-terminated. Unconditionally |
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* done here to save the size test. |
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*/ |
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buf[size - 1] = 0; |
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return 0; |
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err_clear: |
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memset(buf, 0, size); |
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return -EINVAL; |
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} |
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const struct bpf_func_proto bpf_get_current_comm_proto = { |
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.func = bpf_get_current_comm, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_PTR_TO_UNINIT_MEM, |
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.arg2_type = ARG_CONST_SIZE, |
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}; |
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#if defined(CONFIG_QUEUED_SPINLOCKS) || defined(CONFIG_BPF_ARCH_SPINLOCK) |
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static inline void __bpf_spin_lock(struct bpf_spin_lock *lock) |
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{ |
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arch_spinlock_t *l = (void *)lock; |
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union { |
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__u32 val; |
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arch_spinlock_t lock; |
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} u = { .lock = __ARCH_SPIN_LOCK_UNLOCKED }; |
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compiletime_assert(u.val == 0, "__ARCH_SPIN_LOCK_UNLOCKED not 0"); |
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BUILD_BUG_ON(sizeof(*l) != sizeof(__u32)); |
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BUILD_BUG_ON(sizeof(*lock) != sizeof(__u32)); |
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arch_spin_lock(l); |
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} |
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static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock) |
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{ |
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arch_spinlock_t *l = (void *)lock; |
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arch_spin_unlock(l); |
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} |
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#else |
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static inline void __bpf_spin_lock(struct bpf_spin_lock *lock) |
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{ |
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atomic_t *l = (void *)lock; |
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BUILD_BUG_ON(sizeof(*l) != sizeof(*lock)); |
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do { |
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atomic_cond_read_relaxed(l, !VAL); |
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} while (atomic_xchg(l, 1)); |
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} |
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static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock) |
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{ |
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atomic_t *l = (void *)lock; |
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atomic_set_release(l, 0); |
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} |
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#endif |
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static DEFINE_PER_CPU(unsigned long, irqsave_flags); |
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notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock) |
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{ |
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unsigned long flags; |
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local_irq_save(flags); |
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__bpf_spin_lock(lock); |
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__this_cpu_write(irqsave_flags, flags); |
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return 0; |
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} |
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const struct bpf_func_proto bpf_spin_lock_proto = { |
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.func = bpf_spin_lock, |
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.gpl_only = false, |
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.ret_type = RET_VOID, |
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.arg1_type = ARG_PTR_TO_SPIN_LOCK, |
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}; |
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notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock) |
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{ |
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unsigned long flags; |
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flags = __this_cpu_read(irqsave_flags); |
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__bpf_spin_unlock(lock); |
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local_irq_restore(flags); |
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return 0; |
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} |
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const struct bpf_func_proto bpf_spin_unlock_proto = { |
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.func = bpf_spin_unlock, |
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.gpl_only = false, |
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.ret_type = RET_VOID, |
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.arg1_type = ARG_PTR_TO_SPIN_LOCK, |
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}; |
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void copy_map_value_locked(struct bpf_map *map, void *dst, void *src, |
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bool lock_src) |
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{ |
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struct bpf_spin_lock *lock; |
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if (lock_src) |
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lock = src + map->spin_lock_off; |
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else |
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lock = dst + map->spin_lock_off; |
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preempt_disable(); |
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____bpf_spin_lock(lock); |
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copy_map_value(map, dst, src); |
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____bpf_spin_unlock(lock); |
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preempt_enable(); |
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} |
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BPF_CALL_0(bpf_jiffies64) |
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{ |
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return get_jiffies_64(); |
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} |
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const struct bpf_func_proto bpf_jiffies64_proto = { |
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.func = bpf_jiffies64, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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#ifdef CONFIG_CGROUPS |
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BPF_CALL_0(bpf_get_current_cgroup_id) |
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{ |
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struct cgroup *cgrp = task_dfl_cgroup(current); |
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return cgroup_id(cgrp); |
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} |
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const struct bpf_func_proto bpf_get_current_cgroup_id_proto = { |
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.func = bpf_get_current_cgroup_id, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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}; |
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BPF_CALL_1(bpf_get_current_ancestor_cgroup_id, int, ancestor_level) |
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{ |
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struct cgroup *cgrp = task_dfl_cgroup(current); |
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struct cgroup *ancestor; |
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ancestor = cgroup_ancestor(cgrp, ancestor_level); |
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if (!ancestor) |
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return 0; |
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return cgroup_id(ancestor); |
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} |
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const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto = { |
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.func = bpf_get_current_ancestor_cgroup_id, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_ANYTHING, |
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}; |
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#ifdef CONFIG_CGROUP_BPF |
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DECLARE_PER_CPU(struct bpf_cgroup_storage*, |
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bpf_cgroup_storage[MAX_BPF_CGROUP_STORAGE_TYPE]); |
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BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags) |
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{ |
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/* flags argument is not used now, |
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* but provides an ability to extend the API. |
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* verifier checks that its value is correct. |
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*/ |
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enum bpf_cgroup_storage_type stype = cgroup_storage_type(map); |
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struct bpf_cgroup_storage *storage; |
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void *ptr; |
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storage = this_cpu_read(bpf_cgroup_storage[stype]); |
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if (stype == BPF_CGROUP_STORAGE_SHARED) |
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ptr = &READ_ONCE(storage->buf)->data[0]; |
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else |
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ptr = this_cpu_ptr(storage->percpu_buf); |
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return (unsigned long)ptr; |
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} |
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const struct bpf_func_proto bpf_get_local_storage_proto = { |
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.func = bpf_get_local_storage, |
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.gpl_only = false, |
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.ret_type = RET_PTR_TO_MAP_VALUE, |
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.arg1_type = ARG_CONST_MAP_PTR, |
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.arg2_type = ARG_ANYTHING, |
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}; |
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#endif |
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#define BPF_STRTOX_BASE_MASK 0x1F |
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static int __bpf_strtoull(const char *buf, size_t buf_len, u64 flags, |
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unsigned long long *res, bool *is_negative) |
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{ |
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unsigned int base = flags & BPF_STRTOX_BASE_MASK; |
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const char *cur_buf = buf; |
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size_t cur_len = buf_len; |
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unsigned int consumed; |
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size_t val_len; |
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char str[64]; |
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if (!buf || !buf_len || !res || !is_negative) |
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return -EINVAL; |
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if (base != 0 && base != 8 && base != 10 && base != 16) |
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return -EINVAL; |
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if (flags & ~BPF_STRTOX_BASE_MASK) |
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return -EINVAL; |
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while (cur_buf < buf + buf_len && isspace(*cur_buf)) |
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++cur_buf; |
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*is_negative = (cur_buf < buf + buf_len && *cur_buf == '-'); |
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if (*is_negative) |
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++cur_buf; |
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consumed = cur_buf - buf; |
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cur_len -= consumed; |
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if (!cur_len) |
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return -EINVAL; |
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cur_len = min(cur_len, sizeof(str) - 1); |
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memcpy(str, cur_buf, cur_len); |
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str[cur_len] = '\0'; |
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cur_buf = str; |
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cur_buf = _parse_integer_fixup_radix(cur_buf, &base); |
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val_len = _parse_integer(cur_buf, base, res); |
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if (val_len & KSTRTOX_OVERFLOW) |
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return -ERANGE; |
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if (val_len == 0) |
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return -EINVAL; |
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cur_buf += val_len; |
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consumed += cur_buf - str; |
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return consumed; |
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} |
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static int __bpf_strtoll(const char *buf, size_t buf_len, u64 flags, |
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long long *res) |
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{ |
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unsigned long long _res; |
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bool is_negative; |
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int err; |
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err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative); |
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if (err < 0) |
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return err; |
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if (is_negative) { |
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if ((long long)-_res > 0) |
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return -ERANGE; |
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*res = -_res; |
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} else { |
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if ((long long)_res < 0) |
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return -ERANGE; |
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*res = _res; |
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} |
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return err; |
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} |
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BPF_CALL_4(bpf_strtol, const char *, buf, size_t, buf_len, u64, flags, |
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long *, res) |
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{ |
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long long _res; |
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int err; |
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err = __bpf_strtoll(buf, buf_len, flags, &_res); |
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if (err < 0) |
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return err; |
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if (_res != (long)_res) |
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return -ERANGE; |
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*res = _res; |
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return err; |
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} |
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const struct bpf_func_proto bpf_strtol_proto = { |
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.func = bpf_strtol, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_PTR_TO_MEM, |
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.arg2_type = ARG_CONST_SIZE, |
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.arg3_type = ARG_ANYTHING, |
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.arg4_type = ARG_PTR_TO_LONG, |
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}; |
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BPF_CALL_4(bpf_strtoul, const char *, buf, size_t, buf_len, u64, flags, |
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unsigned long *, res) |
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{ |
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unsigned long long _res; |
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bool is_negative; |
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int err; |
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err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative); |
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if (err < 0) |
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return err; |
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if (is_negative) |
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return -EINVAL; |
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if (_res != (unsigned long)_res) |
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return -ERANGE; |
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*res = _res; |
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return err; |
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} |
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const struct bpf_func_proto bpf_strtoul_proto = { |
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.func = bpf_strtoul, |
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.gpl_only = false, |
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.ret_type = RET_INTEGER, |
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.arg1_type = ARG_PTR_TO_MEM, |
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.arg2_type = ARG_CONST_SIZE, |
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.arg3_type = ARG_ANYTHING, |
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.arg4_type = ARG_PTR_TO_LONG, |
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}; |
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#endif |
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BPF_CALL_4(bpf_get_ns_current_pid_tgid, u64, dev, u64, ino, |
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struct bpf_pidns_info *, nsdata, u32, size) |
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{ |
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struct task_struct *task = current; |
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struct pid_namespace *pidns; |
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int err = -EINVAL; |
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|
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if (unlikely(size != sizeof(struct bpf_pidns_info))) |
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goto clear; |
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if (unlikely((u64)(dev_t)dev != dev)) |
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goto clear; |
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if (unlikely(!task)) |
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goto clear; |
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pidns = task_active_pid_ns(task); |
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if (unlikely(!pidns)) { |
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err = -ENOENT; |
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goto clear; |
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} |
|
|
|
if (!ns_match(&pidns->ns, (dev_t)dev, ino)) |
|
goto clear; |
|
|
|
nsdata->pid = task_pid_nr_ns(task, pidns); |
|
nsdata->tgid = task_tgid_nr_ns(task, pidns); |
|
return 0; |
|
clear: |
|
memset((void *)nsdata, 0, (size_t) size); |
|
return err; |
|
} |
|
|
|
const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto = { |
|
.func = bpf_get_ns_current_pid_tgid, |
|
.gpl_only = false, |
|
.ret_type = RET_INTEGER, |
|
.arg1_type = ARG_ANYTHING, |
|
.arg2_type = ARG_ANYTHING, |
|
.arg3_type = ARG_PTR_TO_UNINIT_MEM, |
|
.arg4_type = ARG_CONST_SIZE, |
|
}; |
|
|
|
static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = { |
|
.func = bpf_get_raw_cpu_id, |
|
.gpl_only = false, |
|
.ret_type = RET_INTEGER, |
|
}; |
|
|
|
BPF_CALL_5(bpf_event_output_data, void *, ctx, struct bpf_map *, map, |
|
u64, flags, void *, data, u64, size) |
|
{ |
|
if (unlikely(flags & ~(BPF_F_INDEX_MASK))) |
|
return -EINVAL; |
|
|
|
return bpf_event_output(map, flags, data, size, NULL, 0, NULL); |
|
} |
|
|
|
const struct bpf_func_proto bpf_event_output_data_proto = { |
|
.func = bpf_event_output_data, |
|
.gpl_only = true, |
|
.ret_type = RET_INTEGER, |
|
.arg1_type = ARG_PTR_TO_CTX, |
|
.arg2_type = ARG_CONST_MAP_PTR, |
|
.arg3_type = ARG_ANYTHING, |
|
.arg4_type = ARG_PTR_TO_MEM, |
|
.arg5_type = ARG_CONST_SIZE_OR_ZERO, |
|
}; |
|
|
|
BPF_CALL_3(bpf_copy_from_user, void *, dst, u32, size, |
|
const void __user *, user_ptr) |
|
{ |
|
int ret = copy_from_user(dst, user_ptr, size); |
|
|
|
if (unlikely(ret)) { |
|
memset(dst, 0, size); |
|
ret = -EFAULT; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
const struct bpf_func_proto bpf_copy_from_user_proto = { |
|
.func = bpf_copy_from_user, |
|
.gpl_only = false, |
|
.ret_type = RET_INTEGER, |
|
.arg1_type = ARG_PTR_TO_UNINIT_MEM, |
|
.arg2_type = ARG_CONST_SIZE_OR_ZERO, |
|
.arg3_type = ARG_ANYTHING, |
|
}; |
|
|
|
BPF_CALL_2(bpf_per_cpu_ptr, const void *, ptr, u32, cpu) |
|
{ |
|
if (cpu >= nr_cpu_ids) |
|
return (unsigned long)NULL; |
|
|
|
return (unsigned long)per_cpu_ptr((const void __percpu *)ptr, cpu); |
|
} |
|
|
|
const struct bpf_func_proto bpf_per_cpu_ptr_proto = { |
|
.func = bpf_per_cpu_ptr, |
|
.gpl_only = false, |
|
.ret_type = RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, |
|
.arg1_type = ARG_PTR_TO_PERCPU_BTF_ID, |
|
.arg2_type = ARG_ANYTHING, |
|
}; |
|
|
|
BPF_CALL_1(bpf_this_cpu_ptr, const void *, percpu_ptr) |
|
{ |
|
return (unsigned long)this_cpu_ptr((const void __percpu *)percpu_ptr); |
|
} |
|
|
|
const struct bpf_func_proto bpf_this_cpu_ptr_proto = { |
|
.func = bpf_this_cpu_ptr, |
|
.gpl_only = false, |
|
.ret_type = RET_PTR_TO_MEM_OR_BTF_ID, |
|
.arg1_type = ARG_PTR_TO_PERCPU_BTF_ID, |
|
}; |
|
|
|
const struct bpf_func_proto bpf_get_current_task_proto __weak; |
|
const struct bpf_func_proto bpf_probe_read_user_proto __weak; |
|
const struct bpf_func_proto bpf_probe_read_user_str_proto __weak; |
|
const struct bpf_func_proto bpf_probe_read_kernel_proto __weak; |
|
const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak; |
|
|
|
const struct bpf_func_proto * |
|
bpf_base_func_proto(enum bpf_func_id func_id) |
|
{ |
|
switch (func_id) { |
|
case BPF_FUNC_map_lookup_elem: |
|
return &bpf_map_lookup_elem_proto; |
|
case BPF_FUNC_map_update_elem: |
|
return &bpf_map_update_elem_proto; |
|
case BPF_FUNC_map_delete_elem: |
|
return &bpf_map_delete_elem_proto; |
|
case BPF_FUNC_map_push_elem: |
|
return &bpf_map_push_elem_proto; |
|
case BPF_FUNC_map_pop_elem: |
|
return &bpf_map_pop_elem_proto; |
|
case BPF_FUNC_map_peek_elem: |
|
return &bpf_map_peek_elem_proto; |
|
case BPF_FUNC_get_prandom_u32: |
|
return &bpf_get_prandom_u32_proto; |
|
case BPF_FUNC_get_smp_processor_id: |
|
return &bpf_get_raw_smp_processor_id_proto; |
|
case BPF_FUNC_get_numa_node_id: |
|
return &bpf_get_numa_node_id_proto; |
|
case BPF_FUNC_tail_call: |
|
return &bpf_tail_call_proto; |
|
case BPF_FUNC_ktime_get_ns: |
|
return &bpf_ktime_get_ns_proto; |
|
case BPF_FUNC_ktime_get_boot_ns: |
|
return &bpf_ktime_get_boot_ns_proto; |
|
case BPF_FUNC_ktime_get_coarse_ns: |
|
return &bpf_ktime_get_coarse_ns_proto; |
|
case BPF_FUNC_ringbuf_output: |
|
return &bpf_ringbuf_output_proto; |
|
case BPF_FUNC_ringbuf_reserve: |
|
return &bpf_ringbuf_reserve_proto; |
|
case BPF_FUNC_ringbuf_submit: |
|
return &bpf_ringbuf_submit_proto; |
|
case BPF_FUNC_ringbuf_discard: |
|
return &bpf_ringbuf_discard_proto; |
|
case BPF_FUNC_ringbuf_query: |
|
return &bpf_ringbuf_query_proto; |
|
default: |
|
break; |
|
} |
|
|
|
if (!bpf_capable()) |
|
return NULL; |
|
|
|
switch (func_id) { |
|
case BPF_FUNC_spin_lock: |
|
return &bpf_spin_lock_proto; |
|
case BPF_FUNC_spin_unlock: |
|
return &bpf_spin_unlock_proto; |
|
case BPF_FUNC_jiffies64: |
|
return &bpf_jiffies64_proto; |
|
case BPF_FUNC_per_cpu_ptr: |
|
return &bpf_per_cpu_ptr_proto; |
|
case BPF_FUNC_this_cpu_ptr: |
|
return &bpf_this_cpu_ptr_proto; |
|
default: |
|
break; |
|
} |
|
|
|
if (!perfmon_capable()) |
|
return NULL; |
|
|
|
switch (func_id) { |
|
case BPF_FUNC_trace_printk: |
|
return bpf_get_trace_printk_proto(); |
|
case BPF_FUNC_get_current_task: |
|
return &bpf_get_current_task_proto; |
|
case BPF_FUNC_probe_read_user: |
|
return &bpf_probe_read_user_proto; |
|
case BPF_FUNC_probe_read_kernel: |
|
return security_locked_down(LOCKDOWN_BPF_READ) < 0 ? |
|
NULL : &bpf_probe_read_kernel_proto; |
|
case BPF_FUNC_probe_read_user_str: |
|
return &bpf_probe_read_user_str_proto; |
|
case BPF_FUNC_probe_read_kernel_str: |
|
return security_locked_down(LOCKDOWN_BPF_READ) < 0 ? |
|
NULL : &bpf_probe_read_kernel_str_proto; |
|
case BPF_FUNC_snprintf_btf: |
|
return &bpf_snprintf_btf_proto; |
|
default: |
|
return NULL; |
|
} |
|
}
|
|
|