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Merge tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Browse Source 
Pull networking updates from Jakub Kicinski:

 - Add redirect_neigh() BPF packet redirect helper, allowing to limit
   stack traversal in common container configs and improving TCP
   back-pressure.

   Daniel reports ~10Gbps => ~15Gbps single stream TCP performance gain.

 - Expand netlink policy support and improve policy export to user
   space. (Ge)netlink core performs request validation according to
   declared policies. Expand the expressiveness of those policies
   (min/max length and bitmasks). Allow dumping policies for particular
   commands. This is used for feature discovery by user space (instead
   of kernel version parsing or trial and error).

 - Support IGMPv3/MLDv2 multicast listener discovery protocols in
   bridge.

 - Allow more than 255 IPv4 multicast interfaces.

 - Add support for Type of Service (ToS) reflection in SYN/SYN-ACK
   packets of TCPv6.

 - In Multi-patch TCP (MPTCP) support concurrent transmission of data on
   multiple subflows in a load balancing scenario. Enhance advertising
   addresses via the RM_ADDR/ADD_ADDR options.

 - Support SMC-Dv2 version of SMC, which enables multi-subnet
   deployments.

 - Allow more calls to same peer in RxRPC.

 - Support two new Controller Area Network (CAN) protocols - CAN-FD and
   ISO 15765-2:2016.

 - Add xfrm/IPsec compat layer, solving the 32bit user space on 64bit
   kernel problem.

 - Add TC actions for implementing MPLS L2 VPNs.

 - Improve nexthop code - e.g. handle various corner cases when nexthop
   objects are removed from groups better, skip unnecessary
   notifications and make it easier to offload nexthops into HW by
   converting to a blocking notifier.

 - Support adding and consuming TCP header options by BPF programs,
   opening the doors for easy experimental and deployment-specific TCP
   option use.

 - Reorganize TCP congestion control (CC) initialization to simplify
   life of TCP CC implemented in BPF.

 - Add support for shipping BPF programs with the kernel and loading
   them early on boot via the User Mode Driver mechanism, hence reusing
   all the user space infra we have.

 - Support sleepable BPF programs, initially targeting LSM and tracing.

 - Add bpf_d_path() helper for returning full path for given 'struct
   path'.

 - Make bpf_tail_call compatible with bpf-to-bpf calls.

 - Allow BPF programs to call map_update_elem on sockmaps.

 - Add BPF Type Format (BTF) support for type and enum discovery, as
   well as support for using BTF within the kernel itself (current use
   is for pretty printing structures).

 - Support listing and getting information about bpf_links via the bpf
   syscall.

 - Enhance kernel interfaces around NIC firmware update. Allow
   specifying overwrite mask to control if settings etc. are reset
   during update; report expected max time operation may take to users;
   support firmware activation without machine reboot incl. limits of
   how much impact reset may have (e.g. dropping link or not).

 - Extend ethtool configuration interface to report IEEE-standard
   counters, to limit the need for per-vendor logic in user space.

 - Adopt or extend devlink use for debug, monitoring, fw update in many
   drivers (dsa loop, ice, ionic, sja1105, qed, mlxsw, mv88e6xxx,
   dpaa2-eth).

 - In mlxsw expose critical and emergency SFP module temperature alarms.
   Refactor port buffer handling to make the defaults more suitable and
   support setting these values explicitly via the DCBNL interface.

 - Add XDP support for Intel's igb driver.

 - Support offloading TC flower classification and filtering rules to
   mscc_ocelot switches.

 - Add PTP support for Marvell Octeontx2 and PP2.2 hardware, as well as
   fixed interval period pulse generator and one-step timestamping in
   dpaa-eth.

 - Add support for various auth offloads in WiFi APs, e.g. SAE (WPA3)
   offload.

 - Add Lynx PHY/PCS MDIO module, and convert various drivers which have
   this HW to use it. Convert mvpp2 to split PCS.

 - Support Marvell Prestera 98DX3255 24-port switch ASICs, as well as
   7-port Mediatek MT7531 IP.

 - Add initial support for QCA6390 and IPQ6018 in ath11k WiFi driver,
   and wcn3680 support in wcn36xx.

 - Improve performance for packets which don't require much offloads on
   recent Mellanox NICs by 20% by making multiple packets share a
   descriptor entry.

 - Move chelsio inline crypto drivers (for TLS and IPsec) from the
   crypto subtree to drivers/net. Move MDIO drivers out of the phy
   directory.

 - Clean up a lot of W=1 warnings, reportedly the actively developed
   subsections of networking drivers should now build W=1 warning free.

 - Make sure drivers don't use in_interrupt() to dynamically adapt their
   code. Convert tasklets to use new tasklet_setup API (sadly this
   conversion is not yet complete).

* tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2583 commits)
  Revert "bpfilter: Fix build error with CONFIG_BPFILTER_UMH"
  net, sockmap: Don't call bpf_prog_put() on NULL pointer
  bpf, selftest: Fix flaky tcp_hdr_options test when adding addr to lo
  bpf, sockmap: Add locking annotations to iterator
  netfilter: nftables: allow re-computing sctp CRC-32C in 'payload' statements
  net: fix pos incrementment in ipv6_route_seq_next
  net/smc: fix invalid return code in smcd_new_buf_create()
  net/smc: fix valid DMBE buffer sizes
  net/smc: fix use-after-free of delayed events
  bpfilter: Fix build error with CONFIG_BPFILTER_UMH
  cxgb4/ch_ipsec: Replace the module name to ch_ipsec from chcr
  net: sched: Fix suspicious RCU usage while accessing tcf_tunnel_info
  bpf: Fix register equivalence tracking.
  rxrpc: Fix loss of final ack on shutdown
  rxrpc: Fix bundle counting for exclusive connections
  netfilter: restore NF_INET_NUMHOOKS
  ibmveth: Identify ingress large send packets.
  ibmveth: Switch order of ibmveth_helper calls.
  cxgb4: handle 4-tuple PEDIT to NAT mode translation
  selftests: Add VRF route leaking tests
  ...
This commit is contained in:
Linus Torvalds
2020-10-15 18:42:13 -07:00
parent 840e5bb326 105faa8742
commit 9ff9b0d392
2301 changed files with 130033 additions and 50954 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
kernel/bpf/Makefile
View File

@@ -5,6 +5,7 @@ CFLAGS_core.o += $(call cc-disable-warning, override-init)
obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o bpf_iter.o map_iter.o task_iter.o prog_iter.o
obj-$(CONFIG_BPF_SYSCALL) += hashtab.o arraymap.o percpu_freelist.o bpf_lru_list.o lpm_trie.o map_in_map.o
obj-$(CONFIG_BPF_SYSCALL) += local_storage.o queue_stack_maps.o ringbuf.o
obj-${CONFIG_BPF_LSM} += bpf_inode_storage.o
obj-$(CONFIG_BPF_SYSCALL) += disasm.o
obj-$(CONFIG_BPF_JIT) += trampoline.o
obj-$(CONFIG_BPF_SYSCALL) += btf.o
@@ -12,6 +13,7 @@ obj-$(CONFIG_BPF_JIT) += dispatcher.o
ifeq ($(CONFIG_NET),y)
obj-$(CONFIG_BPF_SYSCALL) += devmap.o
obj-$(CONFIG_BPF_SYSCALL) += cpumap.o
obj-$(CONFIG_BPF_SYSCALL) += bpf_local_storage.o
obj-$(CONFIG_BPF_SYSCALL) += offload.o
obj-$(CONFIG_BPF_SYSCALL) += net_namespace.o
endif
@@ -29,3 +31,4 @@ ifeq ($(CONFIG_BPF_JIT),y)
obj-$(CONFIG_BPF_SYSCALL) += bpf_struct_ops.o
obj-${CONFIG_BPF_LSM} += bpf_lsm.o
endif
obj-$(CONFIG_BPF_PRELOAD) += preload/

102
kernel/bpf/arraymap.c
View File

@@ -10,11 +10,13 @@
#include <linux/filter.h>
#include <linux/perf_event.h>
#include <uapi/linux/btf.h>
#include <linux/rcupdate_trace.h>
#include "map_in_map.h"
#define ARRAY_CREATE_FLAG_MASK \
(BPF_F_NUMA_NODE | BPF_F_MMAPABLE | BPF_F_ACCESS_MASK)
(BPF_F_NUMA_NODE | BPF_F_MMAPABLE | BPF_F_ACCESS_MASK | \
BPF_F_PRESERVE_ELEMS | BPF_F_INNER_MAP)
static void bpf_array_free_percpu(struct bpf_array *array)
{
@@ -60,7 +62,11 @@ int array_map_alloc_check(union bpf_attr *attr)
return -EINVAL;
if (attr->map_type != BPF_MAP_TYPE_ARRAY &&
attr->map_flags & BPF_F_MMAPABLE)
attr->map_flags & (BPF_F_MMAPABLE | BPF_F_INNER_MAP))
return -EINVAL;
if (attr->map_type != BPF_MAP_TYPE_PERF_EVENT_ARRAY &&
attr->map_flags & BPF_F_PRESERVE_ELEMS)
return -EINVAL;
if (attr->value_size > KMALLOC_MAX_SIZE)
@@ -208,7 +214,7 @@ static int array_map_direct_value_meta(const struct bpf_map *map, u64 imm,
}
/* emit BPF instructions equivalent to C code of array_map_lookup_elem() */
static u32 array_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf)
static int array_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf)
{
struct bpf_array *array = container_of(map, struct bpf_array, map);
struct bpf_insn *insn = insn_buf;
@@ -217,6 +223,9 @@ static u32 array_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf)
const int map_ptr = BPF_REG_1;
const int index = BPF_REG_2;
if (map->map_flags & BPF_F_INNER_MAP)
return -EOPNOTSUPP;
*insn++ = BPF_ALU64_IMM(BPF_ADD, map_ptr, offsetof(struct bpf_array, value));
*insn++ = BPF_LDX_MEM(BPF_W, ret, index, 0);
if (!map->bypass_spec_v1) {
@@ -487,6 +496,15 @@ static int array_map_mmap(struct bpf_map *map, struct vm_area_struct *vma)
vma->vm_pgoff + pgoff);
}
static bool array_map_meta_equal(const struct bpf_map *meta0,
const struct bpf_map *meta1)
{
if (!bpf_map_meta_equal(meta0, meta1))
return false;
return meta0->map_flags & BPF_F_INNER_MAP ? true :
meta0->max_entries == meta1->max_entries;
}
struct bpf_iter_seq_array_map_info {
struct bpf_map *map;
void *percpu_value_buf;
@@ -625,6 +643,7 @@ static const struct bpf_iter_seq_info iter_seq_info = {
static int array_map_btf_id;
const struct bpf_map_ops array_map_ops = {
.map_meta_equal = array_map_meta_equal,
.map_alloc_check = array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = array_map_free,
@@ -647,6 +666,7 @@ const struct bpf_map_ops array_map_ops = {
static int percpu_array_map_btf_id;
const struct bpf_map_ops percpu_array_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = array_map_free,
@@ -888,6 +908,7 @@ static void prog_array_map_poke_run(struct bpf_map *map, u32 key,
struct bpf_prog *old,
struct bpf_prog *new)
{
u8 *old_addr, *new_addr, *old_bypass_addr;
struct prog_poke_elem *elem;
struct bpf_array_aux *aux;
@@ -908,12 +929,13 @@ static void prog_array_map_poke_run(struct bpf_map *map, u32 key,
* there could be danger of use after free otherwise.
* 2) Initially when we start tracking aux, the program
* is not JITed yet and also does not have a kallsyms
* entry. We skip these as poke->ip_stable is not
* active yet. The JIT will do the final fixup before
* setting it stable. The various poke->ip_stable are
* successively activated, so tail call updates can
* arrive from here while JIT is still finishing its
* final fixup for non-activated poke entries.
* entry. We skip these as poke->tailcall_target_stable
* is not active yet. The JIT will do the final fixup
* before setting it stable. The various
* poke->tailcall_target_stable are successively
* activated, so tail call updates can arrive from here
* while JIT is still finishing its final fixup for
* non-activated poke entries.
* 3) On program teardown, the program's kallsym entry gets
* removed out of RCU callback, but we can only untrack
* from sleepable context, therefore bpf_arch_text_poke()
@@ -930,7 +952,7 @@ static void prog_array_map_poke_run(struct bpf_map *map, u32 key,
* 5) Any other error happening below from bpf_arch_text_poke()
* is a unexpected bug.
*/
if (!READ_ONCE(poke->ip_stable))
if (!READ_ONCE(poke->tailcall_target_stable))
continue;
if (poke->reason != BPF_POKE_REASON_TAIL_CALL)
continue;
@@ -938,12 +960,39 @@ static void prog_array_map_poke_run(struct bpf_map *map, u32 key,
poke->tail_call.key != key)
continue;
ret = bpf_arch_text_poke(poke->ip, BPF_MOD_JUMP,
old ? (u8 *)old->bpf_func +
poke->adj_off : NULL,
new ? (u8 *)new->bpf_func +
poke->adj_off : NULL);
BUG_ON(ret < 0 && ret != -EINVAL);
old_bypass_addr = old ? NULL : poke->bypass_addr;
old_addr = old ? (u8 *)old->bpf_func + poke->adj_off : NULL;
new_addr = new ? (u8 *)new->bpf_func + poke->adj_off : NULL;
if (new) {
ret = bpf_arch_text_poke(poke->tailcall_target,
BPF_MOD_JUMP,
old_addr, new_addr);
BUG_ON(ret < 0 && ret != -EINVAL);
if (!old) {
ret = bpf_arch_text_poke(poke->tailcall_bypass,
BPF_MOD_JUMP,
poke->bypass_addr,
NULL);
BUG_ON(ret < 0 && ret != -EINVAL);
}
} else {
ret = bpf_arch_text_poke(poke->tailcall_bypass,
BPF_MOD_JUMP,
old_bypass_addr,
poke->bypass_addr);
BUG_ON(ret < 0 && ret != -EINVAL);
/* let other CPUs finish the execution of program
* so that it will not possible to expose them
* to invalid nop, stack unwind, nop state
*/
if (!ret)
synchronize_rcu();
ret = bpf_arch_text_poke(poke->tailcall_target,
BPF_MOD_JUMP,
old_addr, NULL);
BUG_ON(ret < 0 && ret != -EINVAL);
}
}
}
}
@@ -1003,6 +1052,11 @@ static void prog_array_map_free(struct bpf_map *map)
fd_array_map_free(map);
}
/* prog_array->aux->{type,jited} is a runtime binding.
* Doing static check alone in the verifier is not enough.
* Thus, prog_array_map cannot be used as an inner_map
* and map_meta_equal is not implemented.
*/
static int prog_array_map_btf_id;
const struct bpf_map_ops prog_array_map_ops = {
.map_alloc_check = fd_array_map_alloc_check,
@@ -1090,6 +1144,9 @@ static void perf_event_fd_array_release(struct bpf_map *map,
struct bpf_event_entry *ee;
int i;
if (map->map_flags & BPF_F_PRESERVE_ELEMS)
return;
rcu_read_lock();
for (i = 0; i < array->map.max_entries; i++) {
ee = READ_ONCE(array->ptrs[i]);
@@ -1099,11 +1156,19 @@ static void perf_event_fd_array_release(struct bpf_map *map,
rcu_read_unlock();
}
static void perf_event_fd_array_map_free(struct bpf_map *map)
{
if (map->map_flags & BPF_F_PRESERVE_ELEMS)
bpf_fd_array_map_clear(map);
fd_array_map_free(map);
}
static int perf_event_array_map_btf_id;
const struct bpf_map_ops perf_event_array_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = fd_array_map_free,
.map_free = perf_event_fd_array_map_free,
.map_get_next_key = array_map_get_next_key,
.map_lookup_elem = fd_array_map_lookup_elem,
.map_delete_elem = fd_array_map_delete_elem,
@@ -1137,6 +1202,7 @@ static void cgroup_fd_array_free(struct bpf_map *map)
static int cgroup_array_map_btf_id;
const struct bpf_map_ops cgroup_array_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = cgroup_fd_array_free,
@@ -1190,7 +1256,7 @@ static void *array_of_map_lookup_elem(struct bpf_map *map, void *key)
return READ_ONCE(*inner_map);
}
static u32 array_of_map_gen_lookup(struct bpf_map *map,
static int array_of_map_gen_lookup(struct bpf_map *map,
struct bpf_insn *insn_buf)
{
struct bpf_array *array = container_of(map, struct bpf_array, map);

272
kernel/bpf/bpf_inode_storage.c Normal file
View File

@@ -0,0 +1,272 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2019 Facebook
* Copyright 2020 Google LLC.
*/
#include <linux/rculist.h>
#include <linux/list.h>
#include <linux/hash.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/bpf.h>
#include <linux/bpf_local_storage.h>
#include <net/sock.h>
#include <uapi/linux/sock_diag.h>
#include <uapi/linux/btf.h>
#include <linux/bpf_lsm.h>
#include <linux/btf_ids.h>
#include <linux/fdtable.h>
DEFINE_BPF_STORAGE_CACHE(inode_cache);
static struct bpf_local_storage __rcu **
inode_storage_ptr(void *owner)
{
struct inode *inode = owner;
struct bpf_storage_blob *bsb;
bsb = bpf_inode(inode);
if (!bsb)
return NULL;
return &bsb->storage;
}
static struct bpf_local_storage_data *inode_storage_lookup(struct inode *inode,
struct bpf_map *map,
bool cacheit_lockit)
{
struct bpf_local_storage *inode_storage;
struct bpf_local_storage_map *smap;
struct bpf_storage_blob *bsb;
bsb = bpf_inode(inode);
if (!bsb)
return NULL;
inode_storage = rcu_dereference(bsb->storage);
if (!inode_storage)
return NULL;
smap = (struct bpf_local_storage_map *)map;
return bpf_local_storage_lookup(inode_storage, smap, cacheit_lockit);
}
void bpf_inode_storage_free(struct inode *inode)
{
struct bpf_local_storage_elem *selem;
struct bpf_local_storage *local_storage;
bool free_inode_storage = false;
struct bpf_storage_blob *bsb;
struct hlist_node *n;
bsb = bpf_inode(inode);
if (!bsb)
return;
rcu_read_lock();
local_storage = rcu_dereference(bsb->storage);
if (!local_storage) {
rcu_read_unlock();
return;
}
/* Netiher the bpf_prog nor the bpf-map's syscall
* could be modifying the local_storage->list now.
* Thus, no elem can be added-to or deleted-from the
* local_storage->list by the bpf_prog or by the bpf-map's syscall.
*
* It is racing with bpf_local_storage_map_free() alone
* when unlinking elem from the local_storage->list and
* the map's bucket->list.
*/
raw_spin_lock_bh(&local_storage->lock);
hlist_for_each_entry_safe(selem, n, &local_storage->list, snode) {
/* Always unlink from map before unlinking from
* local_storage.
*/
bpf_selem_unlink_map(selem);
free_inode_storage = bpf_selem_unlink_storage_nolock(
local_storage, selem, false);
}
raw_spin_unlock_bh(&local_storage->lock);
rcu_read_unlock();
/* free_inoode_storage should always be true as long as
* local_storage->list was non-empty.
*/
if (free_inode_storage)
kfree_rcu(local_storage, rcu);
}
static void *bpf_fd_inode_storage_lookup_elem(struct bpf_map *map, void *key)
{
struct bpf_local_storage_data *sdata;
struct file *f;
int fd;
fd = *(int *)key;
f = fget_raw(fd);
if (!f)
return NULL;
sdata = inode_storage_lookup(f->f_inode, map, true);
fput(f);
return sdata ? sdata->data : NULL;
}
static int bpf_fd_inode_storage_update_elem(struct bpf_map *map, void *key,
void *value, u64 map_flags)
{
struct bpf_local_storage_data *sdata;
struct file *f;
int fd;
fd = *(int *)key;
f = fget_raw(fd);
if (!f || !inode_storage_ptr(f->f_inode))
return -EBADF;
sdata = bpf_local_storage_update(f->f_inode,
(struct bpf_local_storage_map *)map,
value, map_flags);
fput(f);
return PTR_ERR_OR_ZERO(sdata);
}
static int inode_storage_delete(struct inode *inode, struct bpf_map *map)
{
struct bpf_local_storage_data *sdata;
sdata = inode_storage_lookup(inode, map, false);
if (!sdata)
return -ENOENT;
bpf_selem_unlink(SELEM(sdata));
return 0;
}
static int bpf_fd_inode_storage_delete_elem(struct bpf_map *map, void *key)
{
struct file *f;
int fd, err;
fd = *(int *)key;
f = fget_raw(fd);
if (!f)
return -EBADF;
err = inode_storage_delete(f->f_inode, map);
fput(f);
return err;
}
BPF_CALL_4(bpf_inode_storage_get, struct bpf_map *, map, struct inode *, inode,
void *, value, u64, flags)
{
struct bpf_local_storage_data *sdata;
if (flags & ~(BPF_LOCAL_STORAGE_GET_F_CREATE))
return (unsigned long)NULL;
/* explicitly check that the inode_storage_ptr is not
* NULL as inode_storage_lookup returns NULL in this case and
* bpf_local_storage_update expects the owner to have a
* valid storage pointer.
*/
if (!inode_storage_ptr(inode))
return (unsigned long)NULL;
sdata = inode_storage_lookup(inode, map, true);
if (sdata)
return (unsigned long)sdata->data;
/* This helper must only called from where the inode is gurranteed
* to have a refcount and cannot be freed.
*/
if (flags & BPF_LOCAL_STORAGE_GET_F_CREATE) {
sdata = bpf_local_storage_update(
inode, (struct bpf_local_storage_map *)map, value,
BPF_NOEXIST);
return IS_ERR(sdata) ? (unsigned long)NULL :
(unsigned long)sdata->data;
}
return (unsigned long)NULL;
}
BPF_CALL_2(bpf_inode_storage_delete,
struct bpf_map *, map, struct inode *, inode)
{
/* This helper must only called from where the inode is gurranteed
* to have a refcount and cannot be freed.
*/
return inode_storage_delete(inode, map);
}
static int notsupp_get_next_key(struct bpf_map *map, void *key,
void *next_key)
{
return -ENOTSUPP;
}
static struct bpf_map *inode_storage_map_alloc(union bpf_attr *attr)
{
struct bpf_local_storage_map *smap;
smap = bpf_local_storage_map_alloc(attr);
if (IS_ERR(smap))
return ERR_CAST(smap);
smap->cache_idx = bpf_local_storage_cache_idx_get(&inode_cache);
return &smap->map;
}
static void inode_storage_map_free(struct bpf_map *map)
{
struct bpf_local_storage_map *smap;
smap = (struct bpf_local_storage_map *)map;
bpf_local_storage_cache_idx_free(&inode_cache, smap->cache_idx);
bpf_local_storage_map_free(smap);
}
static int inode_storage_map_btf_id;
const struct bpf_map_ops inode_storage_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = bpf_local_storage_map_alloc_check,
.map_alloc = inode_storage_map_alloc,
.map_free = inode_storage_map_free,
.map_get_next_key = notsupp_get_next_key,
.map_lookup_elem = bpf_fd_inode_storage_lookup_elem,
.map_update_elem = bpf_fd_inode_storage_update_elem,
.map_delete_elem = bpf_fd_inode_storage_delete_elem,
.map_check_btf = bpf_local_storage_map_check_btf,
.map_btf_name = "bpf_local_storage_map",
.map_btf_id = &inode_storage_map_btf_id,
.map_owner_storage_ptr = inode_storage_ptr,
};
BTF_ID_LIST_SINGLE(bpf_inode_storage_btf_ids, struct, inode)
const struct bpf_func_proto bpf_inode_storage_get_proto = {
.func = bpf_inode_storage_get,
.gpl_only = false,
.ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &bpf_inode_storage_btf_ids[0],
.arg3_type = ARG_PTR_TO_MAP_VALUE_OR_NULL,
.arg4_type = ARG_ANYTHING,
};
const struct bpf_func_proto bpf_inode_storage_delete_proto = {
.func = bpf_inode_storage_delete,
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_BTF_ID,
.arg2_btf_id = &bpf_inode_storage_btf_ids[0],
};

62
kernel/bpf/bpf_iter.c
View File

@@ -88,8 +88,8 @@ static ssize_t bpf_seq_read(struct file *file, char __user *buf, size_t size,
mutex_lock(&seq->lock);
if (!seq->buf) {
seq->size = PAGE_SIZE;
seq->buf = kmalloc(seq->size, GFP_KERNEL);
seq->size = PAGE_SIZE << 3;
seq->buf = kvmalloc(seq->size, GFP_KERNEL);
if (!seq->buf) {
err = -ENOMEM;
goto done;
@@ -390,10 +390,68 @@ out_unlock:
return ret;
}
static void bpf_iter_link_show_fdinfo(const struct bpf_link *link,
struct seq_file *seq)
{
struct bpf_iter_link *iter_link =
container_of(link, struct bpf_iter_link, link);
bpf_iter_show_fdinfo_t show_fdinfo;
seq_printf(seq,
"target_name:\t%s\n",
iter_link->tinfo->reg_info->target);
show_fdinfo = iter_link->tinfo->reg_info->show_fdinfo;
if (show_fdinfo)
show_fdinfo(&iter_link->aux, seq);
}
static int bpf_iter_link_fill_link_info(const struct bpf_link *link,
struct bpf_link_info *info)
{
struct bpf_iter_link *iter_link =
container_of(link, struct bpf_iter_link, link);
char __user *ubuf = u64_to_user_ptr(info->iter.target_name);
bpf_iter_fill_link_info_t fill_link_info;
u32 ulen = info->iter.target_name_len;
const char *target_name;
u32 target_len;
if (!ulen ^ !ubuf)
return -EINVAL;
target_name = iter_link->tinfo->reg_info->target;
target_len = strlen(target_name);
info->iter.target_name_len = target_len + 1;
if (ubuf) {
if (ulen >= target_len + 1) {
if (copy_to_user(ubuf, target_name, target_len + 1))
return -EFAULT;
} else {
char zero = '\0';
if (copy_to_user(ubuf, target_name, ulen - 1))
return -EFAULT;
if (put_user(zero, ubuf + ulen - 1))
return -EFAULT;
return -ENOSPC;
}
}
fill_link_info = iter_link->tinfo->reg_info->fill_link_info;
if (fill_link_info)
return fill_link_info(&iter_link->aux, info);
return 0;
}
static const struct bpf_link_ops bpf_iter_link_lops = {
.release = bpf_iter_link_release,
.dealloc = bpf_iter_link_dealloc,
.update_prog = bpf_iter_link_replace,
.show_fdinfo = bpf_iter_link_show_fdinfo,
.fill_link_info = bpf_iter_link_fill_link_info,
};
bool bpf_link_is_iter(struct bpf_link *link)

600
kernel/bpf/bpf_local_storage.c Normal file
View File

@@ -0,0 +1,600 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <linux/rculist.h>
#include <linux/list.h>
#include <linux/hash.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/bpf.h>
#include <linux/btf_ids.h>
#include <linux/bpf_local_storage.h>
#include <net/sock.h>
#include <uapi/linux/sock_diag.h>
#include <uapi/linux/btf.h>
#define BPF_LOCAL_STORAGE_CREATE_FLAG_MASK (BPF_F_NO_PREALLOC | BPF_F_CLONE)
static struct bpf_local_storage_map_bucket *
select_bucket(struct bpf_local_storage_map *smap,
struct bpf_local_storage_elem *selem)
{
return &smap->buckets[hash_ptr(selem, smap->bucket_log)];
}
static int mem_charge(struct bpf_local_storage_map *smap, void *owner, u32 size)
{
struct bpf_map *map = &smap->map;
if (!map->ops->map_local_storage_charge)
return 0;
return map->ops->map_local_storage_charge(smap, owner, size);
}
static void mem_uncharge(struct bpf_local_storage_map *smap, void *owner,
u32 size)
{
struct bpf_map *map = &smap->map;
if (map->ops->map_local_storage_uncharge)
map->ops->map_local_storage_uncharge(smap, owner, size);
}
static struct bpf_local_storage __rcu **
owner_storage(struct bpf_local_storage_map *smap, void *owner)
{
struct bpf_map *map = &smap->map;
return map->ops->map_owner_storage_ptr(owner);
}
static bool selem_linked_to_storage(const struct bpf_local_storage_elem *selem)
{
return !hlist_unhashed(&selem->snode);
}
static bool selem_linked_to_map(const struct bpf_local_storage_elem *selem)
{
return !hlist_unhashed(&selem->map_node);
}
struct bpf_local_storage_elem *
bpf_selem_alloc(struct bpf_local_storage_map *smap, void *owner,
void *value, bool charge_mem)
{
struct bpf_local_storage_elem *selem;
if (charge_mem && mem_charge(smap, owner, smap->elem_size))
return NULL;
selem = kzalloc(smap->elem_size, GFP_ATOMIC | __GFP_NOWARN);
if (selem) {
if (value)
memcpy(SDATA(selem)->data, value, smap->map.value_size);
return selem;
}
if (charge_mem)
mem_uncharge(smap, owner, smap->elem_size);
return NULL;
}
/* local_storage->lock must be held and selem->local_storage == local_storage.
* The caller must ensure selem->smap is still valid to be
* dereferenced for its smap->elem_size and smap->cache_idx.
*/
bool bpf_selem_unlink_storage_nolock(struct bpf_local_storage *local_storage,
struct bpf_local_storage_elem *selem,
bool uncharge_mem)
{
struct bpf_local_storage_map *smap;
bool free_local_storage;
void *owner;
smap = rcu_dereference(SDATA(selem)->smap);
owner = local_storage->owner;
/* All uncharging on the owner must be done first.
* The owner may be freed once the last selem is unlinked
* from local_storage.
*/
if (uncharge_mem)
mem_uncharge(smap, owner, smap->elem_size);
free_local_storage = hlist_is_singular_node(&selem->snode,
&local_storage->list);
if (free_local_storage) {
mem_uncharge(smap, owner, sizeof(struct bpf_local_storage));
local_storage->owner = NULL;
/* After this RCU_INIT, owner may be freed and cannot be used */
RCU_INIT_POINTER(*owner_storage(smap, owner), NULL);
/* local_storage is not freed now. local_storage->lock is
* still held and raw_spin_unlock_bh(&local_storage->lock)
* will be done by the caller.
*
* Although the unlock will be done under
* rcu_read_lock(), it is more intutivie to
* read if kfree_rcu(local_storage, rcu) is done
* after the raw_spin_unlock_bh(&local_storage->lock).
*
* Hence, a "bool free_local_storage" is returned
* to the caller which then calls the kfree_rcu()
* after unlock.
*/
}
hlist_del_init_rcu(&selem->snode);
if (rcu_access_pointer(local_storage->cache[smap->cache_idx]) ==
SDATA(selem))
RCU_INIT_POINTER(local_storage->cache[smap->cache_idx], NULL);
kfree_rcu(selem, rcu);
return free_local_storage;
}
static void __bpf_selem_unlink_storage(struct bpf_local_storage_elem *selem)
{
struct bpf_local_storage *local_storage;
bool free_local_storage = false;
if (unlikely(!selem_linked_to_storage(selem)))
/* selem has already been unlinked from sk */
return;
local_storage = rcu_dereference(selem->local_storage);
raw_spin_lock_bh(&local_storage->lock);
if (likely(selem_linked_to_storage(selem)))
free_local_storage = bpf_selem_unlink_storage_nolock(
local_storage, selem, true);
raw_spin_unlock_bh(&local_storage->lock);
if (free_local_storage)
kfree_rcu(local_storage, rcu);
}
void bpf_selem_link_storage_nolock(struct bpf_local_storage *local_storage,
struct bpf_local_storage_elem *selem)
{
RCU_INIT_POINTER(selem->local_storage, local_storage);
hlist_add_head_rcu(&selem->snode, &local_storage->list);
}
void bpf_selem_unlink_map(struct bpf_local_storage_elem *selem)
{
struct bpf_local_storage_map *smap;
struct bpf_local_storage_map_bucket *b;
if (unlikely(!selem_linked_to_map(selem)))
/* selem has already be unlinked from smap */
return;
smap = rcu_dereference(SDATA(selem)->smap);
b = select_bucket(smap, selem);
raw_spin_lock_bh(&b->lock);
if (likely(selem_linked_to_map(selem)))
hlist_del_init_rcu(&selem->map_node);
raw_spin_unlock_bh(&b->lock);
}
void bpf_selem_link_map(struct bpf_local_storage_map *smap,
struct bpf_local_storage_elem *selem)
{
struct bpf_local_storage_map_bucket *b = select_bucket(smap, selem);
raw_spin_lock_bh(&b->lock);
RCU_INIT_POINTER(SDATA(selem)->smap, smap);
hlist_add_head_rcu(&selem->map_node, &b->list);
raw_spin_unlock_bh(&b->lock);
}
void bpf_selem_unlink(struct bpf_local_storage_elem *selem)
{
/* Always unlink from map before unlinking from local_storage
* because selem will be freed after successfully unlinked from
* the local_storage.
*/
bpf_selem_unlink_map(selem);
__bpf_selem_unlink_storage(selem);
}
struct bpf_local_storage_data *
bpf_local_storage_lookup(struct bpf_local_storage *local_storage,
struct bpf_local_storage_map *smap,
bool cacheit_lockit)
{
struct bpf_local_storage_data *sdata;
struct bpf_local_storage_elem *selem;
/* Fast path (cache hit) */
sdata = rcu_dereference(local_storage->cache[smap->cache_idx]);
if (sdata && rcu_access_pointer(sdata->smap) == smap)
return sdata;
/* Slow path (cache miss) */
hlist_for_each_entry_rcu(selem, &local_storage->list, snode)
if (rcu_access_pointer(SDATA(selem)->smap) == smap)
break;
if (!selem)
return NULL;
sdata = SDATA(selem);
if (cacheit_lockit) {
/* spinlock is needed to avoid racing with the
* parallel delete. Otherwise, publishing an already
* deleted sdata to the cache will become a use-after-free
* problem in the next bpf_local_storage_lookup().
*/
raw_spin_lock_bh(&local_storage->lock);
if (selem_linked_to_storage(selem))
rcu_assign_pointer(local_storage->cache[smap->cache_idx],
sdata);
raw_spin_unlock_bh(&local_storage->lock);
}
return sdata;
}
static int check_flags(const struct bpf_local_storage_data *old_sdata,
u64 map_flags)
{
if (old_sdata && (map_flags & ~BPF_F_LOCK) == BPF_NOEXIST)
/* elem already exists */
return -EEXIST;
if (!old_sdata && (map_flags & ~BPF_F_LOCK) == BPF_EXIST)
/* elem doesn't exist, cannot update it */
return -ENOENT;
return 0;
}
int bpf_local_storage_alloc(void *owner,
struct bpf_local_storage_map *smap,
struct bpf_local_storage_elem *first_selem)
{
struct bpf_local_storage *prev_storage, *storage;
struct bpf_local_storage **owner_storage_ptr;
int err;
err = mem_charge(smap, owner, sizeof(*storage));
if (err)
return err;
storage = kzalloc(sizeof(*storage), GFP_ATOMIC | __GFP_NOWARN);
if (!storage) {
err = -ENOMEM;
goto uncharge;
}
INIT_HLIST_HEAD(&storage->list);
raw_spin_lock_init(&storage->lock);
storage->owner = owner;
bpf_selem_link_storage_nolock(storage, first_selem);
bpf_selem_link_map(smap, first_selem);
owner_storage_ptr =
(struct bpf_local_storage **)owner_storage(smap, owner);
/* Publish storage to the owner.
* Instead of using any lock of the kernel object (i.e. owner),
* cmpxchg will work with any kernel object regardless what
* the running context is, bh, irq...etc.
*
* From now on, the owner->storage pointer (e.g. sk->sk_bpf_storage)
* is protected by the storage->lock. Hence, when freeing
* the owner->storage, the storage->lock must be held before
* setting owner->storage ptr to NULL.
*/
prev_storage = cmpxchg(owner_storage_ptr, NULL, storage);
if (unlikely(prev_storage)) {
bpf_selem_unlink_map(first_selem);
err = -EAGAIN;
goto uncharge;
/* Note that even first_selem was linked to smap's
* bucket->list, first_selem can be freed immediately
* (instead of kfree_rcu) because
* bpf_local_storage_map_free() does a
* synchronize_rcu() before walking the bucket->list.
* Hence, no one is accessing selem from the
* bucket->list under rcu_read_lock().
*/
}
return 0;
uncharge:
kfree(storage);
mem_uncharge(smap, owner, sizeof(*storage));
return err;
}
/* sk cannot be going away because it is linking new elem
* to sk->sk_bpf_storage. (i.e. sk->sk_refcnt cannot be 0).
* Otherwise, it will become a leak (and other memory issues
* during map destruction).
*/
struct bpf_local_storage_data *
bpf_local_storage_update(void *owner, struct bpf_local_storage_map *smap,
void *value, u64 map_flags)
{
struct bpf_local_storage_data *old_sdata = NULL;
struct bpf_local_storage_elem *selem;
struct bpf_local_storage *local_storage;
int err;
/* BPF_EXIST and BPF_NOEXIST cannot be both set */
if (unlikely((map_flags & ~BPF_F_LOCK) > BPF_EXIST) ||
/* BPF_F_LOCK can only be used in a value with spin_lock */
unlikely((map_flags & BPF_F_LOCK) &&
!map_value_has_spin_lock(&smap->map)))
return ERR_PTR(-EINVAL);
local_storage = rcu_dereference(*owner_storage(smap, owner));
if (!local_storage || hlist_empty(&local_storage->list)) {
/* Very first elem for the owner */
err = check_flags(NULL, map_flags);
if (err)
return ERR_PTR(err);
selem = bpf_selem_alloc(smap, owner, value, true);
if (!selem)
return ERR_PTR(-ENOMEM);
err = bpf_local_storage_alloc(owner, smap, selem);
if (err) {
kfree(selem);
mem_uncharge(smap, owner, smap->elem_size);
return ERR_PTR(err);
}
return SDATA(selem);
}
if ((map_flags & BPF_F_LOCK) && !(map_flags & BPF_NOEXIST)) {
/* Hoping to find an old_sdata to do inline update
* such that it can avoid taking the local_storage->lock
* and changing the lists.
*/
old_sdata =
bpf_local_storage_lookup(local_storage, smap, false);
err = check_flags(old_sdata, map_flags);
if (err)
return ERR_PTR(err);
if (old_sdata && selem_linked_to_storage(SELEM(old_sdata))) {
copy_map_value_locked(&smap->map, old_sdata->data,
value, false);
return old_sdata;
}
}
raw_spin_lock_bh(&local_storage->lock);
/* Recheck local_storage->list under local_storage->lock */
if (unlikely(hlist_empty(&local_storage->list))) {
/* A parallel del is happening and local_storage is going
* away. It has just been checked before, so very
* unlikely. Return instead of retry to keep things
* simple.
*/
err = -EAGAIN;
goto unlock_err;
}
old_sdata = bpf_local_storage_lookup(local_storage, smap, false);
err = check_flags(old_sdata, map_flags);
if (err)
goto unlock_err;
if (old_sdata && (map_flags & BPF_F_LOCK)) {
copy_map_value_locked(&smap->map, old_sdata->data, value,
false);
selem = SELEM(old_sdata);
goto unlock;
}
/* local_storage->lock is held. Hence, we are sure
* we can unlink and uncharge the old_sdata successfully
* later. Hence, instead of charging the new selem now
* and then uncharge the old selem later (which may cause
* a potential but unnecessary charge failure), avoid taking
* a charge at all here (the "!old_sdata" check) and the
* old_sdata will not be uncharged later during
* bpf_selem_unlink_storage_nolock().
*/
selem = bpf_selem_alloc(smap, owner, value, !old_sdata);
if (!selem) {
err = -ENOMEM;
goto unlock_err;
}
/* First, link the new selem to the map */
bpf_selem_link_map(smap, selem);
/* Second, link (and publish) the new selem to local_storage */
bpf_selem_link_storage_nolock(local_storage, selem);
/* Third, remove old selem, SELEM(old_sdata) */
if (old_sdata) {
bpf_selem_unlink_map(SELEM(old_sdata));
bpf_selem_unlink_storage_nolock(local_storage, SELEM(old_sdata),
false);
}
unlock:
raw_spin_unlock_bh(&local_storage->lock);
return SDATA(selem);
unlock_err:
raw_spin_unlock_bh(&local_storage->lock);
return ERR_PTR(err);
}
u16 bpf_local_storage_cache_idx_get(struct bpf_local_storage_cache *cache)
{
u64 min_usage = U64_MAX;
u16 i, res = 0;
spin_lock(&cache->idx_lock);
for (i = 0; i < BPF_LOCAL_STORAGE_CACHE_SIZE; i++) {
if (cache->idx_usage_counts[i] < min_usage) {
min_usage = cache->idx_usage_counts[i];
res = i;
/* Found a free cache_idx */
if (!min_usage)
break;
}
}
cache->idx_usage_counts[res]++;
spin_unlock(&cache->idx_lock);
return res;
}
void bpf_local_storage_cache_idx_free(struct bpf_local_storage_cache *cache,
u16 idx)
{
spin_lock(&cache->idx_lock);
cache->idx_usage_counts[idx]--;
spin_unlock(&cache->idx_lock);
}
void bpf_local_storage_map_free(struct bpf_local_storage_map *smap)
{
struct bpf_local_storage_elem *selem;
struct bpf_local_storage_map_bucket *b;
unsigned int i;
/* Note that this map might be concurrently cloned from
* bpf_sk_storage_clone. Wait for any existing bpf_sk_storage_clone
* RCU read section to finish before proceeding. New RCU
* read sections should be prevented via bpf_map_inc_not_zero.
*/
synchronize_rcu();
/* bpf prog and the userspace can no longer access this map
* now. No new selem (of this map) can be added
* to the owner->storage or to the map bucket's list.
*
* The elem of this map can be cleaned up here
* or when the storage is freed e.g.
* by bpf_sk_storage_free() during __sk_destruct().
*/
for (i = 0; i < (1U << smap->bucket_log); i++) {
b = &smap->buckets[i];
rcu_read_lock();
/* No one is adding to b->list now */
while ((selem = hlist_entry_safe(
rcu_dereference_raw(hlist_first_rcu(&b->list)),
struct bpf_local_storage_elem, map_node))) {
bpf_selem_unlink(selem);
cond_resched_rcu();
}
rcu_read_unlock();
}
/* While freeing the storage we may still need to access the map.
*
* e.g. when bpf_sk_storage_free() has unlinked selem from the map
* which then made the above while((selem = ...)) loop
* exit immediately.
*
* However, while freeing the storage one still needs to access the
* smap->elem_size to do the uncharging in
* bpf_selem_unlink_storage_nolock().
*
* Hence, wait another rcu grace period for the storage to be freed.
*/
synchronize_rcu();
kvfree(smap->buckets);
kfree(smap);
}
int bpf_local_storage_map_alloc_check(union bpf_attr *attr)
{
if (attr->map_flags & ~BPF_LOCAL_STORAGE_CREATE_FLAG_MASK ||
!(attr->map_flags & BPF_F_NO_PREALLOC) ||
attr->max_entries ||
attr->key_size != sizeof(int) || !attr->value_size ||
/* Enforce BTF for userspace sk dumping */
!attr->btf_key_type_id || !attr->btf_value_type_id)
return -EINVAL;
if (!bpf_capable())
return -EPERM;
if (attr->value_size > BPF_LOCAL_STORAGE_MAX_VALUE_SIZE)
return -E2BIG;
return 0;
}
struct bpf_local_storage_map *bpf_local_storage_map_alloc(union bpf_attr *attr)
{
struct bpf_local_storage_map *smap;
unsigned int i;
u32 nbuckets;
u64 cost;
int ret;
smap = kzalloc(sizeof(*smap), GFP_USER | __GFP_NOWARN);
if (!smap)
return ERR_PTR(-ENOMEM);
bpf_map_init_from_attr(&smap->map, attr);
nbuckets = roundup_pow_of_two(num_possible_cpus());
/* Use at least 2 buckets, select_bucket() is undefined behavior with 1 bucket */
nbuckets = max_t(u32, 2, nbuckets);
smap->bucket_log = ilog2(nbuckets);
cost = sizeof(*smap->buckets) * nbuckets + sizeof(*smap);
ret = bpf_map_charge_init(&smap->map.memory, cost);
if (ret < 0) {
kfree(smap);
return ERR_PTR(ret);
}
smap->buckets = kvcalloc(sizeof(*smap->buckets), nbuckets,
GFP_USER | __GFP_NOWARN);
if (!smap->buckets) {
bpf_map_charge_finish(&smap->map.memory);
kfree(smap);
return ERR_PTR(-ENOMEM);
}
for (i = 0; i < nbuckets; i++) {
INIT_HLIST_HEAD(&smap->buckets[i].list);
raw_spin_lock_init(&smap->buckets[i].lock);
}
smap->elem_size =
sizeof(struct bpf_local_storage_elem) + attr->value_size;
return smap;
}
int bpf_local_storage_map_check_btf(const struct bpf_map *map,
const struct btf *btf,
const struct btf_type *key_type,
const struct btf_type *value_type)
{
u32 int_data;
if (BTF_INFO_KIND(key_type->info) != BTF_KIND_INT)
return -EINVAL;
int_data = *(u32 *)(key_type + 1);
if (BTF_INT_BITS(int_data) != 32 || BTF_INT_OFFSET(int_data))
return -EINVAL;
return 0;
}

21
kernel/bpf/bpf_lsm.c
View File

@@ -11,6 +11,8 @@
#include <linux/bpf_lsm.h>
#include <linux/kallsyms.h>
#include <linux/bpf_verifier.h>
#include <net/bpf_sk_storage.h>
#include <linux/bpf_local_storage.h>
/* For every LSM hook that allows attachment of BPF programs, declare a nop
* function where a BPF program can be attached.
@@ -45,10 +47,27 @@ int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
return 0;
}
static const struct bpf_func_proto *
bpf_lsm_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
{
switch (func_id) {
case BPF_FUNC_inode_storage_get:
return &bpf_inode_storage_get_proto;
case BPF_FUNC_inode_storage_delete:
return &bpf_inode_storage_delete_proto;
case BPF_FUNC_sk_storage_get:
return &bpf_sk_storage_get_proto;
case BPF_FUNC_sk_storage_delete:
return &bpf_sk_storage_delete_proto;
default:
return tracing_prog_func_proto(func_id, prog);
}
}
const struct bpf_prog_ops lsm_prog_ops = {
};
const struct bpf_verifier_ops lsm_verifier_ops = {
.get_func_proto = tracing_prog_func_proto,
.get_func_proto = bpf_lsm_func_proto,
.is_valid_access = btf_ctx_access,
};

6
kernel/bpf/bpf_struct_ops.c
View File

@@ -298,8 +298,7 @@ static int check_zero_holes(const struct btf_type *t, void *data)
return -EINVAL;
mtype = btf_type_by_id(btf_vmlinux, member->type);
mtype = btf_resolve_size(btf_vmlinux, mtype, &msize,
NULL, NULL);
mtype = btf_resolve_size(btf_vmlinux, mtype, &msize);
if (IS_ERR(mtype))
return PTR_ERR(mtype);
prev_mend = moff + msize;
@@ -396,8 +395,7 @@ static int bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
u32 msize;
mtype = btf_type_by_id(btf_vmlinux, member->type);
mtype = btf_resolve_size(btf_vmlinux, mtype, &msize,
NULL, NULL);
mtype = btf_resolve_size(btf_vmlinux, mtype, &msize);
if (IS_ERR(mtype)) {
err = PTR_ERR(mtype);
goto reset_unlock;

1229
kernel/bpf/btf.c
View File

File diff suppressed because it is too large Load Diff

29
kernel/bpf/core.c
View File

@@ -98,6 +98,8 @@ struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flag
fp->jit_requested = ebpf_jit_enabled();
INIT_LIST_HEAD_RCU(&fp->aux->ksym.lnode);
mutex_init(&fp->aux->used_maps_mutex);
mutex_init(&fp->aux->dst_mutex);
return fp;
}
@@ -253,6 +255,8 @@ struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
void __bpf_prog_free(struct bpf_prog *fp)
{
if (fp->aux) {
mutex_destroy(&fp->aux->used_maps_mutex);
mutex_destroy(&fp->aux->dst_mutex);
free_percpu(fp->aux->stats);
kfree(fp->aux->poke_tab);
kfree(fp->aux);
@@ -773,7 +777,8 @@ int bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
if (size > poke_tab_max)
return -ENOSPC;
if (poke->ip || poke->ip_stable || poke->adj_off)
if (poke->tailcall_target || poke->tailcall_target_stable ||
poke->tailcall_bypass || poke->adj_off || poke->bypass_addr)
return -EINVAL;
switch (poke->reason) {
@@ -1747,8 +1752,9 @@ bool bpf_prog_array_compatible(struct bpf_array *array,
static int bpf_check_tail_call(const struct bpf_prog *fp)
{
struct bpf_prog_aux *aux = fp->aux;
int i;
int i, ret = 0;
mutex_lock(&aux->used_maps_mutex);
for (i = 0; i < aux->used_map_cnt; i++) {
struct bpf_map *map = aux->used_maps[i];
struct bpf_array *array;
@@ -1757,11 +1763,15 @@ static int bpf_check_tail_call(const struct bpf_prog *fp)
continue;
array = container_of(map, struct bpf_array, map);
if (!bpf_prog_array_compatible(array, fp))
return -EINVAL;
if (!bpf_prog_array_compatible(array, fp)) {
ret = -EINVAL;
goto out;
}
}
return 0;
out:
mutex_unlock(&aux->used_maps_mutex);
return ret;
}
static void bpf_prog_select_func(struct bpf_prog *fp)
@@ -2130,7 +2140,8 @@ static void bpf_prog_free_deferred(struct work_struct *work)
if (aux->prog->has_callchain_buf)
put_callchain_buffers();
#endif
bpf_trampoline_put(aux->trampoline);
if (aux->dst_trampoline)
bpf_trampoline_put(aux->dst_trampoline);
for (i = 0; i < aux->func_cnt; i++)
bpf_jit_free(aux->func[i]);
if (aux->func_cnt) {
@@ -2146,8 +2157,8 @@ void bpf_prog_free(struct bpf_prog *fp)
{
struct bpf_prog_aux *aux = fp->aux;
if (aux->linked_prog)
bpf_prog_put(aux->linked_prog);
if (aux->dst_prog)
bpf_prog_put(aux->dst_prog);
INIT_WORK(&aux->work, bpf_prog_free_deferred);
schedule_work(&aux->work);
}
@@ -2208,6 +2219,8 @@ const struct bpf_func_proto bpf_get_current_cgroup_id_proto __weak;
const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto __weak;
const struct bpf_func_proto bpf_get_local_storage_proto __weak;
const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto __weak;
const struct bpf_func_proto bpf_snprintf_btf_proto __weak;
const struct bpf_func_proto bpf_seq_printf_btf_proto __weak;
const struct bpf_func_proto * __weak bpf_get_trace_printk_proto(void)
{

17
kernel/bpf/cpumap.c
View File

@@ -79,8 +79,6 @@ struct bpf_cpu_map {
static DEFINE_PER_CPU(struct list_head, cpu_map_flush_list);
static int bq_flush_to_queue(struct xdp_bulk_queue *bq);
static struct bpf_map *cpu_map_alloc(union bpf_attr *attr)
{
u32 value_size = attr->value_size;
@@ -157,8 +155,7 @@ static void cpu_map_kthread_stop(struct work_struct *work)
kthread_stop(rcpu->kthread);
}
static struct sk_buff *cpu_map_build_skb(struct bpf_cpu_map_entry *rcpu,
struct xdp_frame *xdpf,
static struct sk_buff *cpu_map_build_skb(struct xdp_frame *xdpf,
struct sk_buff *skb)
{
unsigned int hard_start_headroom;
@@ -367,7 +364,7 @@ static int cpu_map_kthread_run(void *data)
struct sk_buff *skb = skbs[i];
int ret;
skb = cpu_map_build_skb(rcpu, xdpf, skb);
skb = cpu_map_build_skb(xdpf, skb);
if (!skb) {
xdp_return_frame(xdpf);
continue;
@@ -658,6 +655,7 @@ static int cpu_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
static int cpu_map_btf_id;
const struct bpf_map_ops cpu_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc = cpu_map_alloc,
.map_free = cpu_map_free,
.map_delete_elem = cpu_map_delete_elem,
@@ -669,7 +667,7 @@ const struct bpf_map_ops cpu_map_ops = {
.map_btf_id = &cpu_map_btf_id,
};
static int bq_flush_to_queue(struct xdp_bulk_queue *bq)
static void bq_flush_to_queue(struct xdp_bulk_queue *bq)
{
struct bpf_cpu_map_entry *rcpu = bq->obj;
unsigned int processed = 0, drops = 0;
@@ -678,7 +676,7 @@ static int bq_flush_to_queue(struct xdp_bulk_queue *bq)
int i;
if (unlikely(!bq->count))
return 0;
return;
q = rcpu->queue;
spin_lock(&q->producer_lock);
@@ -701,13 +699,12 @@ static int bq_flush_to_queue(struct xdp_bulk_queue *bq)
/* Feedback loop via tracepoints */
trace_xdp_cpumap_enqueue(rcpu->map_id, processed, drops, to_cpu);
return 0;
}
/* Runs under RCU-read-side, plus in softirq under NAPI protection.
* Thus, safe percpu variable access.
*/
static int bq_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf)
static void bq_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf)
{
struct list_head *flush_list = this_cpu_ptr(&cpu_map_flush_list);
struct xdp_bulk_queue *bq = this_cpu_ptr(rcpu->bulkq);
@@ -728,8 +725,6 @@ static int bq_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_frame *xdpf)
if (!bq->flush_node.prev)
list_add(&bq->flush_node, flush_list);
return 0;
}
int cpu_map_enqueue(struct bpf_cpu_map_entry *rcpu, struct xdp_buff *xdp,

17
kernel/bpf/devmap.c
View File

@@ -341,14 +341,14 @@ bool dev_map_can_have_prog(struct bpf_map *map)
return false;
}
static int bq_xmit_all(struct xdp_dev_bulk_queue *bq, u32 flags)
static void bq_xmit_all(struct xdp_dev_bulk_queue *bq, u32 flags)
{
struct net_device *dev = bq->dev;
int sent = 0, drops = 0, err = 0;
int i;
if (unlikely(!bq->count))
return 0;
return;
for (i = 0; i < bq->count; i++) {
struct xdp_frame *xdpf = bq->q[i];
@@ -369,7 +369,7 @@ out:
trace_xdp_devmap_xmit(bq->dev_rx, dev, sent, drops, err);
bq->dev_rx = NULL;
__list_del_clearprev(&bq->flush_node);
return 0;
return;
error:
/* If ndo_xdp_xmit fails with an errno, no frames have been
* xmit'ed and it's our responsibility to them free all.
@@ -421,8 +421,8 @@ struct bpf_dtab_netdev *__dev_map_lookup_elem(struct bpf_map *map, u32 key)
/* Runs under RCU-read-side, plus in softirq under NAPI protection.
* Thus, safe percpu variable access.
*/
static int bq_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
struct net_device *dev_rx)
static void bq_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
struct net_device *dev_rx)
{
struct list_head *flush_list = this_cpu_ptr(&dev_flush_list);
struct xdp_dev_bulk_queue *bq = this_cpu_ptr(dev->xdp_bulkq);
@@ -441,8 +441,6 @@ static int bq_enqueue(struct net_device *dev, struct xdp_frame *xdpf,
if (!bq->flush_node.prev)
list_add(&bq->flush_node, flush_list);
return 0;
}
static inline int __xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
@@ -462,7 +460,8 @@ static inline int __xdp_enqueue(struct net_device *dev, struct xdp_buff *xdp,
if (unlikely(!xdpf))
return -EOVERFLOW;
return bq_enqueue(dev, xdpf, dev_rx);
bq_enqueue(dev, xdpf, dev_rx);
return 0;
}
static struct xdp_buff *dev_map_run_prog(struct net_device *dev,
@@ -751,6 +750,7 @@ static int dev_map_hash_update_elem(struct bpf_map *map, void *key, void *value,
static int dev_map_btf_id;
const struct bpf_map_ops dev_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc = dev_map_alloc,
.map_free = dev_map_free,
.map_get_next_key = dev_map_get_next_key,
@@ -764,6 +764,7 @@ const struct bpf_map_ops dev_map_ops = {
static int dev_map_hash_map_btf_id;
const struct bpf_map_ops dev_map_hash_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc = dev_map_alloc,
.map_free = dev_map_free,
.map_get_next_key = dev_map_hash_get_next_key,

22
kernel/bpf/hashtab.c
View File

@@ -9,6 +9,7 @@
#include <linux/rculist_nulls.h>
#include <linux/random.h>
#include <uapi/linux/btf.h>
#include <linux/rcupdate_trace.h>
#include "percpu_freelist.h"
#include "bpf_lru_list.h"
#include "map_in_map.h"
@@ -577,8 +578,7 @@ static void *__htab_map_lookup_elem(struct bpf_map *map, void *key)
struct htab_elem *l;
u32 hash, key_size;
/* Must be called with rcu_read_lock. */
WARN_ON_ONCE(!rcu_read_lock_held());
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_trace_held());
key_size = map->key_size;
@@ -612,7 +612,7 @@ static void *htab_map_lookup_elem(struct bpf_map *map, void *key)
* bpf_prog
* __htab_map_lookup_elem
*/
static u32 htab_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf)
static int htab_map_gen_lookup(struct bpf_map *map, struct bpf_insn *insn_buf)
{
struct bpf_insn *insn = insn_buf;
const int ret = BPF_REG_0;
@@ -651,7 +651,7 @@ static void *htab_lru_map_lookup_elem_sys(struct bpf_map *map, void *key)
return __htab_lru_map_lookup_elem(map, key, false);
}
static u32 htab_lru_map_gen_lookup(struct bpf_map *map,
static int htab_lru_map_gen_lookup(struct bpf_map *map,
struct bpf_insn *insn_buf)
{
struct bpf_insn *insn = insn_buf;
@@ -941,7 +941,7 @@ static int htab_map_update_elem(struct bpf_map *map, void *key, void *value,
/* unknown flags */
return -EINVAL;
WARN_ON_ONCE(!rcu_read_lock_held());
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_trace_held());
key_size = map->key_size;
@@ -1032,7 +1032,7 @@ static int htab_lru_map_update_elem(struct bpf_map *map, void *key, void *value,
/* unknown flags */
return -EINVAL;
WARN_ON_ONCE(!rcu_read_lock_held());
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_trace_held());
key_size = map->key_size;
@@ -1220,7 +1220,7 @@ static int htab_map_delete_elem(struct bpf_map *map, void *key)
u32 hash, key_size;
int ret = -ENOENT;
WARN_ON_ONCE(!rcu_read_lock_held());
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_trace_held());
key_size = map->key_size;
@@ -1252,7 +1252,7 @@ static int htab_lru_map_delete_elem(struct bpf_map *map, void *key)
u32 hash, key_size;
int ret = -ENOENT;
WARN_ON_ONCE(!rcu_read_lock_held());
WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_trace_held());
key_size = map->key_size;
@@ -1803,6 +1803,7 @@ static const struct bpf_iter_seq_info iter_seq_info = {
static int htab_map_btf_id;
const struct bpf_map_ops htab_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = htab_map_alloc_check,
.map_alloc = htab_map_alloc,
.map_free = htab_map_free,
@@ -1820,6 +1821,7 @@ const struct bpf_map_ops htab_map_ops = {
static int htab_lru_map_btf_id;
const struct bpf_map_ops htab_lru_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = htab_map_alloc_check,
.map_alloc = htab_map_alloc,
.map_free = htab_map_free,
@@ -1940,6 +1942,7 @@ static void htab_percpu_map_seq_show_elem(struct bpf_map *map, void *key,
static int htab_percpu_map_btf_id;
const struct bpf_map_ops htab_percpu_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = htab_map_alloc_check,
.map_alloc = htab_map_alloc,
.map_free = htab_map_free,
@@ -1956,6 +1959,7 @@ const struct bpf_map_ops htab_percpu_map_ops = {
static int htab_lru_percpu_map_btf_id;
const struct bpf_map_ops htab_lru_percpu_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = htab_map_alloc_check,
.map_alloc = htab_map_alloc,
.map_free = htab_map_free,
@@ -2066,7 +2070,7 @@ static void *htab_of_map_lookup_elem(struct bpf_map *map, void *key)
return READ_ONCE(*inner_map);
}
static u32 htab_of_map_gen_lookup(struct bpf_map *map,
static int htab_of_map_gen_lookup(struct bpf_map *map,
struct bpf_insn *insn_buf)
{
struct bpf_insn *insn = insn_buf;

58
kernel/bpf/helpers.c
View File

@@ -601,6 +601,56 @@ const struct bpf_func_proto bpf_event_output_data_proto = {
.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;
@@ -661,8 +711,16 @@ bpf_base_func_proto(enum bpf_func_id func_id)
if (!perfmon_capable())
return NULL;
return bpf_get_trace_printk_proto();
case BPF_FUNC_snprintf_btf:
if (!perfmon_capable())
return NULL;
return &bpf_snprintf_btf_proto;
case BPF_FUNC_jiffies64:
return &bpf_jiffies64_proto;
case BPF_FUNC_bpf_per_cpu_ptr:
return &bpf_per_cpu_ptr_proto;
case BPF_FUNC_bpf_this_cpu_ptr:
return &bpf_this_cpu_ptr_proto;
default:
break;
}

116
kernel/bpf/inode.c
View File

@@ -20,6 +20,7 @@
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include "preload/bpf_preload.h"
enum bpf_type {
BPF_TYPE_UNSPEC = 0,
@@ -371,9 +372,10 @@ static struct dentry *
bpf_lookup(struct inode *dir, struct dentry *dentry, unsigned flags)
{
/* Dots in names (e.g. "/sys/fs/bpf/foo.bar") are reserved for future
* extensions.
* extensions. That allows popoulate_bpffs() create special files.
*/
if (strchr(dentry->d_name.name, '.'))
if ((dir->i_mode & S_IALLUGO) &&
strchr(dentry->d_name.name, '.'))
return ERR_PTR(-EPERM);
return simple_lookup(dir, dentry, flags);
@@ -411,6 +413,27 @@ static const struct inode_operations bpf_dir_iops = {
.unlink = simple_unlink,
};
/* pin iterator link into bpffs */
static int bpf_iter_link_pin_kernel(struct dentry *parent,
const char *name, struct bpf_link *link)
{
umode_t mode = S_IFREG | S_IRUSR;
struct dentry *dentry;
int ret;
inode_lock(parent->d_inode);
dentry = lookup_one_len(name, parent, strlen(name));
if (IS_ERR(dentry)) {
inode_unlock(parent->d_inode);
return PTR_ERR(dentry);
}
ret = bpf_mkobj_ops(dentry, mode, link, &bpf_link_iops,
&bpf_iter_fops);
dput(dentry);
inode_unlock(parent->d_inode);
return ret;
}
static int bpf_obj_do_pin(const char __user *pathname, void *raw,
enum bpf_type type)
{
@@ -640,6 +663,91 @@ static int bpf_parse_param(struct fs_context *fc, struct fs_parameter *param)
return 0;
}
struct bpf_preload_ops *bpf_preload_ops;
EXPORT_SYMBOL_GPL(bpf_preload_ops);
static bool bpf_preload_mod_get(void)
{
/* If bpf_preload.ko wasn't loaded earlier then load it now.
* When bpf_preload is built into vmlinux the module's __init
* function will populate it.
*/
if (!bpf_preload_ops) {
request_module("bpf_preload");
if (!bpf_preload_ops)
return false;
}
/* And grab the reference, so the module doesn't disappear while the
* kernel is interacting with the kernel module and its UMD.
*/
if (!try_module_get(bpf_preload_ops->owner)) {
pr_err("bpf_preload module get failed.\n");
return false;
}
return true;
}
static void bpf_preload_mod_put(void)
{
if (bpf_preload_ops)
/* now user can "rmmod bpf_preload" if necessary */
module_put(bpf_preload_ops->owner);
}
static DEFINE_MUTEX(bpf_preload_lock);
static int populate_bpffs(struct dentry *parent)
{
struct bpf_preload_info objs[BPF_PRELOAD_LINKS] = {};
struct bpf_link *links[BPF_PRELOAD_LINKS] = {};
int err = 0, i;
/* grab the mutex to make sure the kernel interactions with bpf_preload
* UMD are serialized
*/
mutex_lock(&bpf_preload_lock);
/* if bpf_preload.ko wasn't built into vmlinux then load it */
if (!bpf_preload_mod_get())
goto out;
if (!bpf_preload_ops->info.tgid) {
/* preload() will start UMD that will load BPF iterator programs */
err = bpf_preload_ops->preload(objs);
if (err)
goto out_put;
for (i = 0; i < BPF_PRELOAD_LINKS; i++) {
links[i] = bpf_link_by_id(objs[i].link_id);
if (IS_ERR(links[i])) {
err = PTR_ERR(links[i]);
goto out_put;
}
}
for (i = 0; i < BPF_PRELOAD_LINKS; i++) {
err = bpf_iter_link_pin_kernel(parent,
objs[i].link_name, links[i]);
if (err)
goto out_put;
/* do not unlink successfully pinned links even
* if later link fails to pin
*/
links[i] = NULL;
}
/* finish() will tell UMD process to exit */
err = bpf_preload_ops->finish();
if (err)
goto out_put;
}
out_put:
bpf_preload_mod_put();
out:
mutex_unlock(&bpf_preload_lock);
for (i = 0; i < BPF_PRELOAD_LINKS && err; i++)
if (!IS_ERR_OR_NULL(links[i]))
bpf_link_put(links[i]);
return err;
}
static int bpf_fill_super(struct super_block *sb, struct fs_context *fc)
{
static const struct tree_descr bpf_rfiles[] = { { "" } };
@@ -656,8 +764,8 @@ static int bpf_fill_super(struct super_block *sb, struct fs_context *fc)
inode = sb->s_root->d_inode;
inode->i_op = &bpf_dir_iops;
inode->i_mode &= ~S_IALLUGO;
populate_bpffs(sb->s_root);
inode->i_mode |= S_ISVTX | opts->mode;
return 0;
}
@@ -707,6 +815,8 @@ static int __init bpf_init(void)
{
int ret;
mutex_init(&bpf_preload_lock);
ret = sysfs_create_mount_point(fs_kobj, "bpf");
if (ret)
return ret;

1
kernel/bpf/lpm_trie.c
View File

@@ -732,6 +732,7 @@ static int trie_check_btf(const struct bpf_map *map,
static int trie_map_btf_id;
const struct bpf_map_ops trie_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc = trie_alloc,
.map_free = trie_free,
.map_get_next_key = trie_get_next_key,

24
kernel/bpf/map_in_map.c
View File

@@ -17,23 +17,17 @@ struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
if (IS_ERR(inner_map))
return inner_map;
/* prog_array->aux->{type,jited} is a runtime binding.
* Doing static check alone in the verifier is not enough.
*/
if (inner_map->map_type == BPF_MAP_TYPE_PROG_ARRAY ||
inner_map->map_type == BPF_MAP_TYPE_CGROUP_STORAGE ||
inner_map->map_type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE ||
inner_map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
fdput(f);
return ERR_PTR(-ENOTSUPP);
}
/* Does not support >1 level map-in-map */
if (inner_map->inner_map_meta) {
fdput(f);
return ERR_PTR(-EINVAL);
}
if (!inner_map->ops->map_meta_equal) {
fdput(f);
return ERR_PTR(-ENOTSUPP);
}
if (map_value_has_spin_lock(inner_map)) {
fdput(f);
return ERR_PTR(-ENOTSUPP);
@@ -81,15 +75,14 @@ bool bpf_map_meta_equal(const struct bpf_map *meta0,
return meta0->map_type == meta1->map_type &&
meta0->key_size == meta1->key_size &&
meta0->value_size == meta1->value_size &&
meta0->map_flags == meta1->map_flags &&
meta0->max_entries == meta1->max_entries;
meta0->map_flags == meta1->map_flags;
}
void *bpf_map_fd_get_ptr(struct bpf_map *map,
struct file *map_file /* not used */,
int ufd)
{
struct bpf_map *inner_map;
struct bpf_map *inner_map, *inner_map_meta;
struct fd f;
f = fdget(ufd);
@@ -97,7 +90,8 @@ void *bpf_map_fd_get_ptr(struct bpf_map *map,
if (IS_ERR(inner_map))
return inner_map;
if (bpf_map_meta_equal(map->inner_map_meta, inner_map))
inner_map_meta = map->inner_map_meta;
if (inner_map_meta->ops->map_meta_equal(inner_map_meta, inner_map))
bpf_map_inc(inner_map);
else
inner_map = ERR_PTR(-EINVAL);

2
kernel/bpf/map_in_map.h
View File

@@ -11,8 +11,6 @@ struct bpf_map;
struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd);
void bpf_map_meta_free(struct bpf_map *map_meta);
bool bpf_map_meta_equal(const struct bpf_map *meta0,
const struct bpf_map *meta1);
void *bpf_map_fd_get_ptr(struct bpf_map *map, struct file *map_file,
int ufd);
void bpf_map_fd_put_ptr(void *ptr);

15
kernel/bpf/map_iter.c
View File

@@ -149,6 +149,19 @@ static void bpf_iter_detach_map(struct bpf_iter_aux_info *aux)
bpf_map_put_with_uref(aux->map);
}
void bpf_iter_map_show_fdinfo(const struct bpf_iter_aux_info *aux,
struct seq_file *seq)
{
seq_printf(seq, "map_id:\t%u\n", aux->map->id);
}
int bpf_iter_map_fill_link_info(const struct bpf_iter_aux_info *aux,
struct bpf_link_info *info)
{
info->iter.map.map_id = aux->map->id;
return 0;
}
DEFINE_BPF_ITER_FUNC(bpf_map_elem, struct bpf_iter_meta *meta,
struct bpf_map *map, void *key, void *value)
@@ -156,6 +169,8 @@ static const struct bpf_iter_reg bpf_map_elem_reg_info = {
.target = "bpf_map_elem",
.attach_target = bpf_iter_attach_map,
.detach_target = bpf_iter_detach_map,
.show_fdinfo = bpf_iter_map_show_fdinfo,
.fill_link_info = bpf_iter_map_fill_link_info,
.ctx_arg_info_size = 2,
.ctx_arg_info = {
{ offsetof(struct bpf_iter__bpf_map_elem, key),

101
kernel/bpf/percpu_freelist.c
View File

@@ -17,6 +17,8 @@ int pcpu_freelist_init(struct pcpu_freelist *s)
raw_spin_lock_init(&head->lock);
head->first = NULL;
}
raw_spin_lock_init(&s->extralist.lock);
s->extralist.first = NULL;
return 0;
}
@@ -40,12 +42,50 @@ static inline void ___pcpu_freelist_push(struct pcpu_freelist_head *head,
raw_spin_unlock(&head->lock);
}
static inline bool pcpu_freelist_try_push_extra(struct pcpu_freelist *s,
struct pcpu_freelist_node *node)
{
if (!raw_spin_trylock(&s->extralist.lock))
return false;
pcpu_freelist_push_node(&s->extralist, node);
raw_spin_unlock(&s->extralist.lock);
return true;
}
static inline void ___pcpu_freelist_push_nmi(struct pcpu_freelist *s,
struct pcpu_freelist_node *node)
{
int cpu, orig_cpu;
orig_cpu = cpu = raw_smp_processor_id();
while (1) {
struct pcpu_freelist_head *head;
head = per_cpu_ptr(s->freelist, cpu);
if (raw_spin_trylock(&head->lock)) {
pcpu_freelist_push_node(head, node);
raw_spin_unlock(&head->lock);
return;
}
cpu = cpumask_next(cpu, cpu_possible_mask);
if (cpu >= nr_cpu_ids)
cpu = 0;
/* cannot lock any per cpu lock, try extralist */
if (cpu == orig_cpu &&
pcpu_freelist_try_push_extra(s, node))
return;
}
}
void __pcpu_freelist_push(struct pcpu_freelist *s,
struct pcpu_freelist_node *node)
{
struct pcpu_freelist_head *head = this_cpu_ptr(s->freelist);
___pcpu_freelist_push(head, node);
if (in_nmi())
___pcpu_freelist_push_nmi(s, node);
else
___pcpu_freelist_push(this_cpu_ptr(s->freelist), node);
}
void pcpu_freelist_push(struct pcpu_freelist *s,
@@ -81,7 +121,7 @@ again:
}
}
struct pcpu_freelist_node *__pcpu_freelist_pop(struct pcpu_freelist *s)
static struct pcpu_freelist_node *___pcpu_freelist_pop(struct pcpu_freelist *s)
{
struct pcpu_freelist_head *head;
struct pcpu_freelist_node *node;
@@ -102,8 +142,59 @@ struct pcpu_freelist_node *__pcpu_freelist_pop(struct pcpu_freelist *s)
if (cpu >= nr_cpu_ids)
cpu = 0;
if (cpu == orig_cpu)
return NULL;
break;
}
/* per cpu lists are all empty, try extralist */
raw_spin_lock(&s->extralist.lock);
node = s->extralist.first;
if (node)
s->extralist.first = node->next;
raw_spin_unlock(&s->extralist.lock);
return node;
}
static struct pcpu_freelist_node *
___pcpu_freelist_pop_nmi(struct pcpu_freelist *s)
{
struct pcpu_freelist_head *head;
struct pcpu_freelist_node *node;
int orig_cpu, cpu;
orig_cpu = cpu = raw_smp_processor_id();
while (1) {
head = per_cpu_ptr(s->freelist, cpu);
if (raw_spin_trylock(&head->lock)) {
node = head->first;
if (node) {
head->first = node->next;
raw_spin_unlock(&head->lock);
return node;
}
raw_spin_unlock(&head->lock);
}
cpu = cpumask_next(cpu, cpu_possible_mask);
if (cpu >= nr_cpu_ids)
cpu = 0;
if (cpu == orig_cpu)
break;
}
/* cannot pop from per cpu lists, try extralist */
if (!raw_spin_trylock(&s->extralist.lock))
return NULL;
node = s->extralist.first;
if (node)
s->extralist.first = node->next;
raw_spin_unlock(&s->extralist.lock);
return node;
}
struct pcpu_freelist_node *__pcpu_freelist_pop(struct pcpu_freelist *s)
{
if (in_nmi())
return ___pcpu_freelist_pop_nmi(s);
return ___pcpu_freelist_pop(s);
}
struct pcpu_freelist_node *pcpu_freelist_pop(struct pcpu_freelist *s)

1
kernel/bpf/percpu_freelist.h
View File

@@ -13,6 +13,7 @@ struct pcpu_freelist_head {
struct pcpu_freelist {
struct pcpu_freelist_head __percpu *freelist;
struct pcpu_freelist_head extralist;
};
struct pcpu_freelist_node {

4
kernel/bpf/preload/.gitignore vendored Normal file
View File

@@ -0,0 +1,4 @@
/FEATURE-DUMP.libbpf
/bpf_helper_defs.h
/feature
/bpf_preload_umd

26
kernel/bpf/preload/Kconfig Normal file
View File

@@ -0,0 +1,26 @@
# SPDX-License-Identifier: GPL-2.0-only
config USERMODE_DRIVER
bool
default n
menuconfig BPF_PRELOAD
bool "Preload BPF file system with kernel specific program and map iterators"
depends on BPF
# The dependency on !COMPILE_TEST prevents it from being enabled
# in allmodconfig or allyesconfig configurations
depends on !COMPILE_TEST
select USERMODE_DRIVER
help
This builds kernel module with several embedded BPF programs that are
pinned into BPF FS mount point as human readable files that are
useful in debugging and introspection of BPF programs and maps.
if BPF_PRELOAD
config BPF_PRELOAD_UMD
tristate "bpf_preload kernel module with user mode driver"
depends on CC_CAN_LINK
depends on m || CC_CAN_LINK_STATIC
default m
help
This builds bpf_preload kernel module with embedded user mode driver.
endif

25
kernel/bpf/preload/Makefile Normal file
View File

@@ -0,0 +1,25 @@
# SPDX-License-Identifier: GPL-2.0
LIBBPF_SRCS = $(srctree)/tools/lib/bpf/
LIBBPF_A = $(obj)/libbpf.a
LIBBPF_OUT = $(abspath $(obj))
$(LIBBPF_A):
$(Q)$(MAKE) -C $(LIBBPF_SRCS) OUTPUT=$(LIBBPF_OUT)/ $(LIBBPF_OUT)/libbpf.a
userccflags += -I $(srctree)/tools/include/ -I $(srctree)/tools/include/uapi \
-I $(srctree)/tools/lib/ -Wno-unused-result
userprogs := bpf_preload_umd
clean-files := $(userprogs) bpf_helper_defs.h FEATURE-DUMP.libbpf staticobjs/ feature/
bpf_preload_umd-objs := iterators/iterators.o
bpf_preload_umd-userldlibs := $(LIBBPF_A) -lelf -lz
$(obj)/bpf_preload_umd: $(LIBBPF_A)
$(obj)/bpf_preload_umd_blob.o: $(obj)/bpf_preload_umd
obj-$(CONFIG_BPF_PRELOAD_UMD) += bpf_preload.o
bpf_preload-objs += bpf_preload_kern.o bpf_preload_umd_blob.o

16
kernel/bpf/preload/bpf_preload.h Normal file
View File

@@ -0,0 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BPF_PRELOAD_H
#define _BPF_PRELOAD_H
#include <linux/usermode_driver.h>
#include "iterators/bpf_preload_common.h"
struct bpf_preload_ops {
struct umd_info info;
int (*preload)(struct bpf_preload_info *);
int (*finish)(void);
struct module *owner;
};
extern struct bpf_preload_ops *bpf_preload_ops;
#define BPF_PRELOAD_LINKS 2
#endif

91
kernel/bpf/preload/bpf_preload_kern.c Normal file
View File

@@ -0,0 +1,91 @@
// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pid.h>
#include <linux/fs.h>
#include <linux/sched/signal.h>
#include "bpf_preload.h"
extern char bpf_preload_umd_start;
extern char bpf_preload_umd_end;
static int preload(struct bpf_preload_info *obj);
static int finish(void);
static struct bpf_preload_ops umd_ops = {
.info.driver_name = "bpf_preload",
.preload = preload,
.finish = finish,
.owner = THIS_MODULE,
};
static int preload(struct bpf_preload_info *obj)
{
int magic = BPF_PRELOAD_START;
loff_t pos = 0;
int i, err;
ssize_t n;
err = fork_usermode_driver(&umd_ops.info);
if (err)
return err;
/* send the start magic to let UMD proceed with loading BPF progs */
n = kernel_write(umd_ops.info.pipe_to_umh,
&magic, sizeof(magic), &pos);
if (n != sizeof(magic))
return -EPIPE;
/* receive bpf_link IDs and names from UMD */
pos = 0;
for (i = 0; i < BPF_PRELOAD_LINKS; i++) {
n = kernel_read(umd_ops.info.pipe_from_umh,
&obj[i], sizeof(*obj), &pos);
if (n != sizeof(*obj))
return -EPIPE;
}
return 0;
}
static int finish(void)
{
int magic = BPF_PRELOAD_END;
struct pid *tgid;
loff_t pos = 0;
ssize_t n;
/* send the last magic to UMD. It will do a normal exit. */
n = kernel_write(umd_ops.info.pipe_to_umh,
&magic, sizeof(magic), &pos);
if (n != sizeof(magic))
return -EPIPE;
tgid = umd_ops.info.tgid;
wait_event(tgid->wait_pidfd, thread_group_exited(tgid));
umd_ops.info.tgid = NULL;
return 0;
}
static int __init load_umd(void)
{
int err;
err = umd_load_blob(&umd_ops.info, &bpf_preload_umd_start,
&bpf_preload_umd_end - &bpf_preload_umd_start);
if (err)
return err;
bpf_preload_ops = &umd_ops;
return err;
}
static void __exit fini_umd(void)
{
bpf_preload_ops = NULL;
/* kill UMD in case it's still there due to earlier error */
kill_pid(umd_ops.info.tgid, SIGKILL, 1);
umd_ops.info.tgid = NULL;
umd_unload_blob(&umd_ops.info);
}
late_initcall(load_umd);
module_exit(fini_umd);
MODULE_LICENSE("GPL");

7
kernel/bpf/preload/bpf_preload_umd_blob.S Normal file
View File

@@ -0,0 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
.section .init.rodata, "a"
.global bpf_preload_umd_start
bpf_preload_umd_start:
.incbin "kernel/bpf/preload/bpf_preload_umd"
.global bpf_preload_umd_end
bpf_preload_umd_end:

2
kernel/bpf/preload/iterators/.gitignore vendored Normal file
View File

@@ -0,0 +1,2 @@
# SPDX-License-Identifier: GPL-2.0-only
/.output

57
kernel/bpf/preload/iterators/Makefile Normal file
View File

@@ -0,0 +1,57 @@
# SPDX-License-Identifier: GPL-2.0
OUTPUT := .output
CLANG ?= clang
LLC ?= llc
LLVM_STRIP ?= llvm-strip
DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool
BPFTOOL ?= $(DEFAULT_BPFTOOL)
LIBBPF_SRC := $(abspath ../../../../tools/lib/bpf)
BPFOBJ := $(OUTPUT)/libbpf.a
BPF_INCLUDE := $(OUTPUT)
INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../../../tools/lib) \
-I$(abspath ../../../../tools/include/uapi)
CFLAGS := -g -Wall
abs_out := $(abspath $(OUTPUT))
ifeq ($(V),1)
Q =
msg =
else
Q = @
msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
MAKEFLAGS += --no-print-directory
submake_extras := feature_display=0
endif
.DELETE_ON_ERROR:
.PHONY: all clean
all: iterators.skel.h
clean:
$(call msg,CLEAN)
$(Q)rm -rf $(OUTPUT) iterators
iterators.skel.h: $(OUTPUT)/iterators.bpf.o | $(BPFTOOL)
$(call msg,GEN-SKEL,$@)
$(Q)$(BPFTOOL) gen skeleton $< > $@
$(OUTPUT)/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
$(call msg,BPF,$@)
$(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \
-c $(filter %.c,$^) -o $@ && \
$(LLVM_STRIP) -g $@
$(OUTPUT):
$(call msg,MKDIR,$@)
$(Q)mkdir -p $(OUTPUT)
$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
$(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \
OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
$(DEFAULT_BPFTOOL):
$(Q)$(MAKE) $(submake_extras) -C ../../../../tools/bpf/bpftool \
prefix= OUTPUT=$(abs_out)/ DESTDIR=$(abs_out) install

4
kernel/bpf/preload/iterators/README Normal file
View File

@@ -0,0 +1,4 @@
WARNING:
If you change "iterators.bpf.c" do "make -j" in this directory to rebuild "iterators.skel.h".
Make sure to have clang 10 installed.
See Documentation/bpf/bpf_devel_QA.rst

13
kernel/bpf/preload/iterators/bpf_preload_common.h Normal file
View File

@@ -0,0 +1,13 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BPF_PRELOAD_COMMON_H
#define _BPF_PRELOAD_COMMON_H
#define BPF_PRELOAD_START 0x5555
#define BPF_PRELOAD_END 0xAAAA
struct bpf_preload_info {
char link_name[16];
int link_id;
};
#endif

114
kernel/bpf/preload/iterators/iterators.bpf.c Normal file
View File

@@ -0,0 +1,114 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)
struct seq_file;
struct bpf_iter_meta {
struct seq_file *seq;
__u64 session_id;
__u64 seq_num;
};
struct bpf_map {
__u32 id;
char name[16];
__u32 max_entries;
};
struct bpf_iter__bpf_map {
struct bpf_iter_meta *meta;
struct bpf_map *map;
};
struct btf_type {
__u32 name_off;
};
struct btf_header {
__u32 str_len;
};
struct btf {
const char *strings;
struct btf_type **types;
struct btf_header hdr;
};
struct bpf_prog_aux {
__u32 id;
char name[16];
const char *attach_func_name;
struct bpf_prog *dst_prog;
struct bpf_func_info *func_info;
struct btf *btf;
};
struct bpf_prog {
struct bpf_prog_aux *aux;
};
struct bpf_iter__bpf_prog {
struct bpf_iter_meta *meta;
struct bpf_prog *prog;
};
#pragma clang attribute pop
static const char *get_name(struct btf *btf, long btf_id, const char *fallback)
{
struct btf_type **types, *t;
unsigned int name_off;
const char *str;
if (!btf)
return fallback;
str = btf->strings;
types = btf->types;
bpf_probe_read_kernel(&t, sizeof(t), types + btf_id);
name_off = BPF_CORE_READ(t, name_off);
if (name_off >= btf->hdr.str_len)
return fallback;
return str + name_off;
}
SEC("iter/bpf_map")
int dump_bpf_map(struct bpf_iter__bpf_map *ctx)
{
struct seq_file *seq = ctx->meta->seq;
__u64 seq_num = ctx->meta->seq_num;
struct bpf_map *map = ctx->map;
if (!map)
return 0;
if (seq_num == 0)
BPF_SEQ_PRINTF(seq, " id name max_entries\n");
BPF_SEQ_PRINTF(seq, "%4u %-16s%6d\n", map->id, map->name, map->max_entries);
return 0;
}
SEC("iter/bpf_prog")
int dump_bpf_prog(struct bpf_iter__bpf_prog *ctx)
{
struct seq_file *seq = ctx->meta->seq;
__u64 seq_num = ctx->meta->seq_num;
struct bpf_prog *prog = ctx->prog;
struct bpf_prog_aux *aux;
if (!prog)
return 0;
aux = prog->aux;
if (seq_num == 0)
BPF_SEQ_PRINTF(seq, " id name attached\n");
BPF_SEQ_PRINTF(seq, "%4u %-16s %s %s\n", aux->id,
get_name(aux->btf, aux->func_info[0].type_id, aux->name),
aux->attach_func_name, aux->dst_prog->aux->name);
return 0;
}
char LICENSE[] SEC("license") = "GPL";

94
kernel/bpf/preload/iterators/iterators.c Normal file
View File

@@ -0,0 +1,94 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <argp.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/resource.h>
#include <bpf/libbpf.h>
#include <bpf/bpf.h>
#include <sys/mount.h>
#include "iterators.skel.h"
#include "bpf_preload_common.h"
int to_kernel = -1;
int from_kernel = 0;
static int send_link_to_kernel(struct bpf_link *link, const char *link_name)
{
struct bpf_preload_info obj = {};
struct bpf_link_info info = {};
__u32 info_len = sizeof(info);
int err;
err = bpf_obj_get_info_by_fd(bpf_link__fd(link), &info, &info_len);
if (err)
return err;
obj.link_id = info.id;
if (strlen(link_name) >= sizeof(obj.link_name))
return -E2BIG;
strcpy(obj.link_name, link_name);
if (write(to_kernel, &obj, sizeof(obj)) != sizeof(obj))
return -EPIPE;
return 0;
}
int main(int argc, char **argv)
{
struct rlimit rlim = { RLIM_INFINITY, RLIM_INFINITY };
struct iterators_bpf *skel;
int err, magic;
int debug_fd;
debug_fd = open("/dev/console", O_WRONLY | O_NOCTTY | O_CLOEXEC);
if (debug_fd < 0)
return 1;
to_kernel = dup(1);
close(1);
dup(debug_fd);
/* now stdin and stderr point to /dev/console */
read(from_kernel, &magic, sizeof(magic));
if (magic != BPF_PRELOAD_START) {
printf("bad start magic %d\n", magic);
return 1;
}
setrlimit(RLIMIT_MEMLOCK, &rlim);
/* libbpf opens BPF object and loads it into the kernel */
skel = iterators_bpf__open_and_load();
if (!skel) {
/* iterators.skel.h is little endian.
* libbpf doesn't support automatic little->big conversion
* of BPF bytecode yet.
* The program load will fail in such case.
*/
printf("Failed load could be due to wrong endianness\n");
return 1;
}
err = iterators_bpf__attach(skel);
if (err)
goto cleanup;
/* send two bpf_link IDs with names to the kernel */
err = send_link_to_kernel(skel->links.dump_bpf_map, "maps.debug");
if (err)
goto cleanup;
err = send_link_to_kernel(skel->links.dump_bpf_prog, "progs.debug");
if (err)
goto cleanup;
/* The kernel will proceed with pinnging the links in bpffs.
* UMD will wait on read from pipe.
*/
read(from_kernel, &magic, sizeof(magic));
if (magic != BPF_PRELOAD_END) {
printf("bad final magic %d\n", magic);
err = -EINVAL;
}
cleanup:
iterators_bpf__destroy(skel);
return err != 0;
}

412
kernel/bpf/preload/iterators/iterators.skel.h Normal file
View File

@@ -0,0 +1,412 @@
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
/* THIS FILE IS AUTOGENERATED! */
#ifndef __ITERATORS_BPF_SKEL_H__
#define __ITERATORS_BPF_SKEL_H__
#include <stdlib.h>
#include <bpf/libbpf.h>
struct iterators_bpf {
struct bpf_object_skeleton *skeleton;
struct bpf_object *obj;
struct {
struct bpf_map *rodata;
} maps;
struct {
struct bpf_program *dump_bpf_map;
struct bpf_program *dump_bpf_prog;
} progs;
struct {
struct bpf_link *dump_bpf_map;
struct bpf_link *dump_bpf_prog;
} links;
struct iterators_bpf__rodata {
char dump_bpf_map____fmt[35];
char dump_bpf_map____fmt_1[14];
char dump_bpf_prog____fmt[32];
char dump_bpf_prog____fmt_2[17];
} *rodata;
};
static void
iterators_bpf__destroy(struct iterators_bpf *obj)
{
if (!obj)
return;
if (obj->skeleton)
bpf_object__destroy_skeleton(obj->skeleton);
free(obj);
}
static inline int
iterators_bpf__create_skeleton(struct iterators_bpf *obj);
static inline struct iterators_bpf *
iterators_bpf__open_opts(const struct bpf_object_open_opts *opts)
{
struct iterators_bpf *obj;
obj = (struct iterators_bpf *)calloc(1, sizeof(*obj));
if (!obj)
return NULL;
if (iterators_bpf__create_skeleton(obj))
goto err;
if (bpf_object__open_skeleton(obj->skeleton, opts))
goto err;
return obj;
err:
iterators_bpf__destroy(obj);
return NULL;
}
static inline struct iterators_bpf *
iterators_bpf__open(void)
{
return iterators_bpf__open_opts(NULL);
}
static inline int
iterators_bpf__load(struct iterators_bpf *obj)
{
return bpf_object__load_skeleton(obj->skeleton);
}
static inline struct iterators_bpf *
iterators_bpf__open_and_load(void)
{
struct iterators_bpf *obj;
obj = iterators_bpf__open();
if (!obj)
return NULL;
if (iterators_bpf__load(obj)) {
iterators_bpf__destroy(obj);
return NULL;
}
return obj;
}
static inline int
iterators_bpf__attach(struct iterators_bpf *obj)
{
return bpf_object__attach_skeleton(obj->skeleton);
}
static inline void
iterators_bpf__detach(struct iterators_bpf *obj)
{
return bpf_object__detach_skeleton(obj->skeleton);
}
static inline int
iterators_bpf__create_skeleton(struct iterators_bpf *obj)
{
struct bpf_object_skeleton *s;
s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));
if (!s)
return -1;
obj->skeleton = s;
s->sz = sizeof(*s);
s->name = "iterators_bpf";
s->obj = &obj->obj;
/* maps */
s->map_cnt = 1;
s->map_skel_sz = sizeof(*s->maps);
s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz);
if (!s->maps)
goto err;
s->maps[0].name = "iterator.rodata";
s->maps[0].map = &obj->maps.rodata;
s->maps[0].mmaped = (void **)&obj->rodata;
/* programs */
s->prog_cnt = 2;
s->prog_skel_sz = sizeof(*s->progs);
s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);
if (!s->progs)
goto err;
s->progs[0].name = "dump_bpf_map";
s->progs[0].prog = &obj->progs.dump_bpf_map;
s->progs[0].link = &obj->links.dump_bpf_map;
s->progs[1].name = "dump_bpf_prog";
s->progs[1].prog = &obj->progs.dump_bpf_prog;
s->progs[1].link = &obj->links.dump_bpf_prog;
s->data_sz = 7176;
s->data = (void *)"\
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\x0c\0\0\0\x3c\x03\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\x4c\x03\0\0\0\0\0\0\0\0\0\0\
\x0c\0\0\0\x5c\x03\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\x6c\x03\0\0\0\0\0\0\0\0\0\0\
\x0c\0\0\0\x7c\x03\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\x8c\x03\0\0\0\0\0\0\0\0\0\0\
\x0c\0\0\0\x9c\x03\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\xac\x03\0\0\0\0\0\0\0\0\0\0\
\x0c\0\0\0\xbc\x03\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\xcc\x03\0\0\0\0\0\0\0\0\0\0\
\x0c\0\0\0\xdc\x03\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\xec\x03\0\0\0\0\0\0\0\0\0\0\
\x0c\0\0\0\xfc\x03\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\x0c\x04\0\0\0\0\0\0\0\0\0\0\
\x0c\0\0\0\x1c\x04\0\0\0\0\0\0\0\0\0\0\x0c\0\0\0\x4d\x4e\x40\x41\x42\x43\x4c\0\
\x2e\x74\x65\x78\x74\0\x2e\x72\x65\x6c\x2e\x42\x54\x46\x2e\x65\x78\x74\0\x64\
\x75\x6d\x70\x5f\x62\x70\x66\x5f\x6d\x61\x70\x2e\x5f\x5f\x5f\x66\x6d\x74\0\x64\
\x75\x6d\x70\x5f\x62\x70\x66\x5f\x70\x72\x6f\x67\x2e\x5f\x5f\x5f\x66\x6d\x74\0\
\x64\x75\x6d\x70\x5f\x62\x70\x66\x5f\x6d\x61\x70\0\x2e\x72\x65\x6c\x69\x74\x65\
\x72\x2f\x62\x70\x66\x5f\x6d\x61\x70\0\x64\x75\x6d\x70\x5f\x62\x70\x66\x5f\x70\
\x72\x6f\x67\0\x2e\x72\x65\x6c\x69\x74\x65\x72\x2f\x62\x70\x66\x5f\x70\x72\x6f\
\x67\0\x2e\x6c\x6c\x76\x6d\x5f\x61\x64\x64\x72\x73\x69\x67\0\x6c\x69\x63\x65\
\x6e\x73\x65\0\x69\x74\x65\x72\x61\x74\x6f\x72\x73\x2e\x62\x70\x66\x2e\x63\0\
\x2e\x73\x74\x72\x74\x61\x62\0\x2e\x73\x79\x6d\x74\x61\x62\0\x2e\x72\x6f\x64\
\x61\x74\x61\0\x2e\x72\x65\x6c\x2e\x42\x54\x46\0\x4c\x49\x43\x45\x4e\x53\x45\0\
\x4c\x42\x42\x31\x5f\x37\0\x4c\x42\x42\x31\x5f\x36\0\x4c\x42\x42\x30\x5f\x34\0\
\x4c\x42\x42\x31\x5f\x33\0\x4c\x42\x42\x30\x5f\x33\0\x64\x75\x6d\x70\x5f\x62\
\x70\x66\x5f\x70\x72\x6f\x67\x2e\x5f\x5f\x5f\x66\x6d\x74\x2e\x32\0\x64\x75\x6d\
\x70\x5f\x62\x70\x66\x5f\x6d\x61\x70\x2e\x5f\x5f\x5f\x66\x6d\x74\x2e\x31\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\x01\0\0\
\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x4e\0\0\0\x01\0\0\0\x06\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\x40\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\0\x6d\0\0\0\x01\0\0\0\x06\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\x40\x01\0\0\0\0\0\0\x08\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x08\0\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\xb1\0\0\0\x01\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x48\x03\0\
\0\0\0\0\0\x62\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\x89\0\0\0\x01\0\0\0\x03\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xaa\x03\0\0\0\0\0\0\x04\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xbd\0\0\0\x01\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xae\x03\0\0\0\0\0\0\x3d\x09\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x0b\0\0\0\x01\0\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\0\0\0\0\xeb\x0c\0\0\0\0\0\0\x2c\x04\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xa9\0\0\0\x02\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\0\0\0\0\x18\x11\0\0\0\0\0\0\x98\x01\0\0\0\0\0\0\x0e\0\0\0\x0e\0\0\0\x08\0\0\
\0\0\0\0\0\x18\0\0\0\0\0\0\0\x4a\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\
\0\xb0\x12\0\0\0\0\0\0\x20\0\0\0\0\0\0\0\x08\0\0\0\x02\0\0\0\x08\0\0\0\0\0\0\0\
\x10\0\0\0\0\0\0\0\x69\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xd0\x12\
\0\0\0\0\0\0\x20\0\0\0\0\0\0\0\x08\0\0\0\x03\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\
\0\0\0\0\xb9\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xf0\x12\0\0\0\0\0\
\0\x50\0\0\0\0\0\0\0\x08\0\0\0\x06\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\
\x07\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\x13\0\0\0\0\0\0\xe0\
\x03\0\0\0\0\0\0\x08\0\0\0\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x7b\0\
\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x20\x17\0\0\0\0\0\0\x07\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xa1\0\0\0\x03\
\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x27\x17\0\0\0\0\0\0\x1a\x01\0\0\0\0\0\0\
\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
return 0;
err:
bpf_object__destroy_skeleton(s);
return -1;
}
#endif /* __ITERATORS_BPF_SKEL_H__ */

2
kernel/bpf/queue_stack_maps.c
View File

@@ -257,6 +257,7 @@ static int queue_stack_map_get_next_key(struct bpf_map *map, void *key,
static int queue_map_btf_id;
const struct bpf_map_ops queue_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = queue_stack_map_alloc_check,
.map_alloc = queue_stack_map_alloc,
.map_free = queue_stack_map_free,
@@ -273,6 +274,7 @@ const struct bpf_map_ops queue_map_ops = {
static int stack_map_btf_id;
const struct bpf_map_ops stack_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = queue_stack_map_alloc_check,
.map_alloc = queue_stack_map_alloc,
.map_free = queue_stack_map_free,

3
kernel/bpf/reuseport_array.c
View File

@@ -191,7 +191,7 @@ int bpf_fd_reuseport_array_lookup_elem(struct bpf_map *map, void *key,
rcu_read_lock();
sk = reuseport_array_lookup_elem(map, key);
if (sk) {
*(u64 *)value = sock_gen_cookie(sk);
*(u64 *)value = __sock_gen_cookie(sk);
err = 0;
} else {
err = -ENOENT;
@@ -351,6 +351,7 @@ static int reuseport_array_get_next_key(struct bpf_map *map, void *key,
static int reuseport_array_map_btf_id;
const struct bpf_map_ops reuseport_array_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc_check = reuseport_array_alloc_check,
.map_alloc = reuseport_array_alloc,
.map_free = reuseport_array_free,

1
kernel/bpf/ringbuf.c
View File

@@ -287,6 +287,7 @@ static __poll_t ringbuf_map_poll(struct bpf_map *map, struct file *filp,
static int ringbuf_map_btf_id;
const struct bpf_map_ops ringbuf_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc = ringbuf_map_alloc,
.map_free = ringbuf_map_free,
.map_mmap = ringbuf_map_mmap,

6
kernel/bpf/stackmap.c
View File

@@ -665,18 +665,17 @@ BPF_CALL_4(bpf_get_task_stack, struct task_struct *, task, void *, buf,
return __bpf_get_stack(regs, task, NULL, buf, size, flags);
}
BTF_ID_LIST(bpf_get_task_stack_btf_ids)
BTF_ID(struct, task_struct)
BTF_ID_LIST_SINGLE(bpf_get_task_stack_btf_ids, struct, task_struct)
const struct bpf_func_proto bpf_get_task_stack_proto = {
.func = bpf_get_task_stack,
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_BTF_ID,
.arg1_btf_id = &bpf_get_task_stack_btf_ids[0],
.arg2_type = ARG_PTR_TO_UNINIT_MEM,
.arg3_type = ARG_CONST_SIZE_OR_ZERO,
.arg4_type = ARG_ANYTHING,
.btf_id = bpf_get_task_stack_btf_ids,
};
BPF_CALL_4(bpf_get_stack_pe, struct bpf_perf_event_data_kern *, ctx,
@@ -839,6 +838,7 @@ static void stack_map_free(struct bpf_map *map)
static int stack_trace_map_btf_id;
const struct bpf_map_ops stack_trace_map_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc = stack_map_alloc,
.map_free = stack_map_free,
.map_get_next_key = stack_map_get_next_key,

331
kernel/bpf/syscall.c
View File

@@ -4,6 +4,7 @@
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/bpf_lirc.h>
#include <linux/bpf_verifier.h>
#include <linux/btf.h>
#include <linux/syscalls.h>
#include <linux/slab.h>
@@ -29,6 +30,7 @@
#include <linux/bpf_lsm.h>
#include <linux/poll.h>
#include <linux/bpf-netns.h>
#include <linux/rcupdate_trace.h>
#define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY || \
(map)->map_type == BPF_MAP_TYPE_CGROUP_ARRAY || \
@@ -90,6 +92,7 @@ int bpf_check_uarg_tail_zero(void __user *uaddr,
}
const struct bpf_map_ops bpf_map_offload_ops = {
.map_meta_equal = bpf_map_meta_equal,
.map_alloc = bpf_map_offload_map_alloc,
.map_free = bpf_map_offload_map_free,
.map_check_btf = map_check_no_btf,
@@ -157,10 +160,11 @@ static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key,
if (bpf_map_is_dev_bound(map)) {
return bpf_map_offload_update_elem(map, key, value, flags);
} else if (map->map_type == BPF_MAP_TYPE_CPUMAP ||
map->map_type == BPF_MAP_TYPE_SOCKHASH ||
map->map_type == BPF_MAP_TYPE_SOCKMAP ||
map->map_type == BPF_MAP_TYPE_STRUCT_OPS) {
return map->ops->map_update_elem(map, key, value, flags);
} else if (map->map_type == BPF_MAP_TYPE_SOCKHASH ||
map->map_type == BPF_MAP_TYPE_SOCKMAP) {
return sock_map_update_elem_sys(map, key, value, flags);
} else if (IS_FD_PROG_ARRAY(map)) {
return bpf_fd_array_map_update_elem(map, f.file, key, value,
flags);
@@ -768,7 +772,8 @@ static int map_check_btf(struct bpf_map *map, const struct btf *btf,
if (map->map_type != BPF_MAP_TYPE_HASH &&
map->map_type != BPF_MAP_TYPE_ARRAY &&
map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE &&
map->map_type != BPF_MAP_TYPE_SK_STORAGE)
map->map_type != BPF_MAP_TYPE_SK_STORAGE &&
map->map_type != BPF_MAP_TYPE_INODE_STORAGE)
return -ENOTSUPP;
if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
map->value_size) {
@@ -1728,10 +1733,14 @@ static void __bpf_prog_put_noref(struct bpf_prog *prog, bool deferred)
btf_put(prog->aux->btf);
bpf_prog_free_linfo(prog);
if (deferred)
call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
else
if (deferred) {
if (prog->aux->sleepable)
call_rcu_tasks_trace(&prog->aux->rcu, __bpf_prog_put_rcu);
else
call_rcu(&prog->aux->rcu, __bpf_prog_put_rcu);
} else {
__bpf_prog_put_rcu(&prog->aux->rcu);
}
}
static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
@@ -2101,6 +2110,7 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT |
BPF_F_ANY_ALIGNMENT |
BPF_F_TEST_STATE_FREQ |
BPF_F_SLEEPABLE |
BPF_F_TEST_RND_HI32))
return -EINVAL;
@@ -2145,17 +2155,18 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
prog->expected_attach_type = attr->expected_attach_type;
prog->aux->attach_btf_id = attr->attach_btf_id;
if (attr->attach_prog_fd) {
struct bpf_prog *tgt_prog;
struct bpf_prog *dst_prog;
tgt_prog = bpf_prog_get(attr->attach_prog_fd);
if (IS_ERR(tgt_prog)) {
err = PTR_ERR(tgt_prog);
dst_prog = bpf_prog_get(attr->attach_prog_fd);
if (IS_ERR(dst_prog)) {
err = PTR_ERR(dst_prog);
goto free_prog_nouncharge;
}
prog->aux->linked_prog = tgt_prog;
prog->aux->dst_prog = dst_prog;
}
prog->aux->offload_requested = !!attr->prog_ifindex;
prog->aux->sleepable = attr->prog_flags & BPF_F_SLEEPABLE;
err = security_bpf_prog_alloc(prog->aux);
if (err)
@@ -2488,11 +2499,23 @@ struct bpf_link *bpf_link_get_from_fd(u32 ufd)
struct bpf_tracing_link {
struct bpf_link link;
enum bpf_attach_type attach_type;
struct bpf_trampoline *trampoline;
struct bpf_prog *tgt_prog;
};
static void bpf_tracing_link_release(struct bpf_link *link)
{
WARN_ON_ONCE(bpf_trampoline_unlink_prog(link->prog));
struct bpf_tracing_link *tr_link =
container_of(link, struct bpf_tracing_link, link);
WARN_ON_ONCE(bpf_trampoline_unlink_prog(link->prog,
tr_link->trampoline));
bpf_trampoline_put(tr_link->trampoline);
/* tgt_prog is NULL if target is a kernel function */
if (tr_link->tgt_prog)
bpf_prog_put(tr_link->tgt_prog);
}
static void bpf_tracing_link_dealloc(struct bpf_link *link)
@@ -2532,10 +2555,15 @@ static const struct bpf_link_ops bpf_tracing_link_lops = {
.fill_link_info = bpf_tracing_link_fill_link_info,
};
static int bpf_tracing_prog_attach(struct bpf_prog *prog)
static int bpf_tracing_prog_attach(struct bpf_prog *prog,
int tgt_prog_fd,
u32 btf_id)
{
struct bpf_link_primer link_primer;
struct bpf_prog *tgt_prog = NULL;
struct bpf_trampoline *tr = NULL;
struct bpf_tracing_link *link;
u64 key = 0;
int err;
switch (prog->type) {
@@ -2564,6 +2592,28 @@ static int bpf_tracing_prog_attach(struct bpf_prog *prog)
goto out_put_prog;
}
if (!!tgt_prog_fd != !!btf_id) {
err = -EINVAL;
goto out_put_prog;
}
if (tgt_prog_fd) {
/* For now we only allow new targets for BPF_PROG_TYPE_EXT */
if (prog->type != BPF_PROG_TYPE_EXT) {
err = -EINVAL;
goto out_put_prog;
}
tgt_prog = bpf_prog_get(tgt_prog_fd);
if (IS_ERR(tgt_prog)) {
err = PTR_ERR(tgt_prog);
tgt_prog = NULL;
goto out_put_prog;
}
key = bpf_trampoline_compute_key(tgt_prog, btf_id);
}
link = kzalloc(sizeof(*link), GFP_USER);
if (!link) {
err = -ENOMEM;
@@ -2573,20 +2623,100 @@ static int bpf_tracing_prog_attach(struct bpf_prog *prog)
&bpf_tracing_link_lops, prog);
link->attach_type = prog->expected_attach_type;
err = bpf_link_prime(&link->link, &link_primer);
if (err) {
kfree(link);
goto out_put_prog;
mutex_lock(&prog->aux->dst_mutex);
/* There are a few possible cases here:
*
* - if prog->aux->dst_trampoline is set, the program was just loaded
* and not yet attached to anything, so we can use the values stored
* in prog->aux
*
* - if prog->aux->dst_trampoline is NULL, the program has already been
* attached to a target and its initial target was cleared (below)
*
* - if tgt_prog != NULL, the caller specified tgt_prog_fd +
* target_btf_id using the link_create API.
*
* - if tgt_prog == NULL when this function was called using the old
* raw_tracepoint_open API, and we need a target from prog->aux
*
* The combination of no saved target in prog->aux, and no target
* specified on load is illegal, and we reject that here.
*/
if (!prog->aux->dst_trampoline && !tgt_prog) {
err = -ENOENT;
goto out_unlock;
}
err = bpf_trampoline_link_prog(prog);
if (!prog->aux->dst_trampoline ||
(key && key != prog->aux->dst_trampoline->key)) {
/* If there is no saved target, or the specified target is
* different from the destination specified at load time, we
* need a new trampoline and a check for compatibility
*/
struct bpf_attach_target_info tgt_info = {};
err = bpf_check_attach_target(NULL, prog, tgt_prog, btf_id,
&tgt_info);
if (err)
goto out_unlock;
tr = bpf_trampoline_get(key, &tgt_info);
if (!tr) {
err = -ENOMEM;
goto out_unlock;
}
} else {
/* The caller didn't specify a target, or the target was the
* same as the destination supplied during program load. This
* means we can reuse the trampoline and reference from program
* load time, and there is no need to allocate a new one. This
* can only happen once for any program, as the saved values in
* prog->aux are cleared below.
*/
tr = prog->aux->dst_trampoline;
tgt_prog = prog->aux->dst_prog;
}
err = bpf_link_prime(&link->link, &link_primer);
if (err)
goto out_unlock;
err = bpf_trampoline_link_prog(prog, tr);
if (err) {
bpf_link_cleanup(&link_primer);
goto out_put_prog;
link = NULL;
goto out_unlock;
}
link->tgt_prog = tgt_prog;
link->trampoline = tr;
/* Always clear the trampoline and target prog from prog->aux to make
* sure the original attach destination is not kept alive after a
* program is (re-)attached to another target.
*/
if (prog->aux->dst_prog &&
(tgt_prog_fd || tr != prog->aux->dst_trampoline))
/* got extra prog ref from syscall, or attaching to different prog */
bpf_prog_put(prog->aux->dst_prog);
if (prog->aux->dst_trampoline && tr != prog->aux->dst_trampoline)
/* we allocated a new trampoline, so free the old one */
bpf_trampoline_put(prog->aux->dst_trampoline);
prog->aux->dst_prog = NULL;
prog->aux->dst_trampoline = NULL;
mutex_unlock(&prog->aux->dst_mutex);
return bpf_link_settle(&link_primer);
out_unlock:
if (tr && tr != prog->aux->dst_trampoline)
bpf_trampoline_put(tr);
mutex_unlock(&prog->aux->dst_mutex);
kfree(link);
out_put_prog:
if (tgt_prog_fd && tgt_prog)
bpf_prog_put(tgt_prog);
bpf_prog_put(prog);
return err;
}
@@ -2700,7 +2830,7 @@ static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
tp_name = prog->aux->attach_func_name;
break;
}
return bpf_tracing_prog_attach(prog);
return bpf_tracing_prog_attach(prog, 0, 0);
case BPF_PROG_TYPE_RAW_TRACEPOINT:
case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
if (strncpy_from_user(buf,
@@ -2969,7 +3099,7 @@ static int bpf_prog_query(const union bpf_attr *attr,
}
}
#define BPF_PROG_TEST_RUN_LAST_FIELD test.ctx_out
#define BPF_PROG_TEST_RUN_LAST_FIELD test.cpu
static int bpf_prog_test_run(const union bpf_attr *attr,
union bpf_attr __user *uattr)
@@ -3152,21 +3282,25 @@ static const struct bpf_map *bpf_map_from_imm(const struct bpf_prog *prog,
const struct bpf_map *map;
int i;
mutex_lock(&prog->aux->used_maps_mutex);
for (i = 0, *off = 0; i < prog->aux->used_map_cnt; i++) {
map = prog->aux->used_maps[i];
if (map == (void *)addr) {
*type = BPF_PSEUDO_MAP_FD;
return map;
goto out;
}
if (!map->ops->map_direct_value_meta)
continue;
if (!map->ops->map_direct_value_meta(map, addr, off)) {
*type = BPF_PSEUDO_MAP_VALUE;
return map;
goto out;
}
}
map = NULL;
return NULL;
out:
mutex_unlock(&prog->aux->used_maps_mutex);
return map;
}
static struct bpf_insn *bpf_insn_prepare_dump(const struct bpf_prog *prog,
@@ -3284,6 +3418,7 @@ static int bpf_prog_get_info_by_fd(struct file *file,
memcpy(info.tag, prog->tag, sizeof(prog->tag));
memcpy(info.name, prog->aux->name, sizeof(prog->aux->name));
mutex_lock(&prog->aux->used_maps_mutex);
ulen = info.nr_map_ids;
info.nr_map_ids = prog->aux->used_map_cnt;
ulen = min_t(u32, info.nr_map_ids, ulen);
@@ -3293,9 +3428,12 @@ static int bpf_prog_get_info_by_fd(struct file *file,
for (i = 0; i < ulen; i++)
if (put_user(prog->aux->used_maps[i]->id,
&user_map_ids[i]))
&user_map_ids[i])) {
mutex_unlock(&prog->aux->used_maps_mutex);
return -EFAULT;
}
}
mutex_unlock(&prog->aux->used_maps_mutex);
err = set_info_rec_size(&info);
if (err)
@@ -3876,10 +4014,15 @@ err_put:
static int tracing_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
{
if (attr->link_create.attach_type == BPF_TRACE_ITER &&
prog->expected_attach_type == BPF_TRACE_ITER)
return bpf_iter_link_attach(attr, prog);
if (attr->link_create.attach_type != prog->expected_attach_type)
return -EINVAL;
if (prog->expected_attach_type == BPF_TRACE_ITER)
return bpf_iter_link_attach(attr, prog);
else if (prog->type == BPF_PROG_TYPE_EXT)
return bpf_tracing_prog_attach(prog,
attr->link_create.target_fd,
attr->link_create.target_btf_id);
return -EINVAL;
}
@@ -3893,18 +4036,25 @@ static int link_create(union bpf_attr *attr)
if (CHECK_ATTR(BPF_LINK_CREATE))
return -EINVAL;
ptype = attach_type_to_prog_type(attr->link_create.attach_type);
if (ptype == BPF_PROG_TYPE_UNSPEC)
return -EINVAL;
prog = bpf_prog_get_type(attr->link_create.prog_fd, ptype);
prog = bpf_prog_get(attr->link_create.prog_fd);
if (IS_ERR(prog))
return PTR_ERR(prog);
ret = bpf_prog_attach_check_attach_type(prog,
attr->link_create.attach_type);
if (ret)
goto err_out;
goto out;
if (prog->type == BPF_PROG_TYPE_EXT) {
ret = tracing_bpf_link_attach(attr, prog);
goto out;
}
ptype = attach_type_to_prog_type(attr->link_create.attach_type);
if (ptype == BPF_PROG_TYPE_UNSPEC || ptype != prog->type) {
ret = -EINVAL;
goto out;
}
switch (ptype) {
case BPF_PROG_TYPE_CGROUP_SKB:
@@ -3932,7 +4082,7 @@ static int link_create(union bpf_attr *attr)
ret = -EINVAL;
}
err_out:
out:
if (ret < 0)
bpf_prog_put(prog);
return ret;
@@ -4014,9 +4164,31 @@ static int link_detach(union bpf_attr *attr)
return ret;
}
static int bpf_link_inc_not_zero(struct bpf_link *link)
static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link)
{
return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? 0 : -ENOENT;
return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT);
}
struct bpf_link *bpf_link_by_id(u32 id)
{
struct bpf_link *link;
if (!id)
return ERR_PTR(-ENOENT);
spin_lock_bh(&link_idr_lock);
/* before link is "settled", ID is 0, pretend it doesn't exist yet */
link = idr_find(&link_idr, id);
if (link) {
if (link->id)
link = bpf_link_inc_not_zero(link);
else
link = ERR_PTR(-EAGAIN);
} else {
link = ERR_PTR(-ENOENT);
}
spin_unlock_bh(&link_idr_lock);
return link;
}
#define BPF_LINK_GET_FD_BY_ID_LAST_FIELD link_id
@@ -4025,7 +4197,7 @@ static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
{
struct bpf_link *link;
u32 id = attr->link_id;
int fd, err;
int fd;
if (CHECK_ATTR(BPF_LINK_GET_FD_BY_ID))
return -EINVAL;
@@ -4033,21 +4205,9 @@ static int bpf_link_get_fd_by_id(const union bpf_attr *attr)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
spin_lock_bh(&link_idr_lock);
link = idr_find(&link_idr, id);
/* before link is "settled", ID is 0, pretend it doesn't exist yet */
if (link) {
if (link->id)
err = bpf_link_inc_not_zero(link);
else
err = -EAGAIN;
} else {
err = -ENOENT;
}
spin_unlock_bh(&link_idr_lock);
if (err)
return err;
link = bpf_link_by_id(id);
if (IS_ERR(link))
return PTR_ERR(link);
fd = bpf_link_new_fd(link);
if (fd < 0)
@@ -4133,6 +4293,68 @@ static int bpf_iter_create(union bpf_attr *attr)
return err;
}
#define BPF_PROG_BIND_MAP_LAST_FIELD prog_bind_map.flags
static int bpf_prog_bind_map(union bpf_attr *attr)
{
struct bpf_prog *prog;
struct bpf_map *map;
struct bpf_map **used_maps_old, **used_maps_new;
int i, ret = 0;
if (CHECK_ATTR(BPF_PROG_BIND_MAP))
return -EINVAL;
if (attr->prog_bind_map.flags)
return -EINVAL;
prog = bpf_prog_get(attr->prog_bind_map.prog_fd);
if (IS_ERR(prog))
return PTR_ERR(prog);
map = bpf_map_get(attr->prog_bind_map.map_fd);
if (IS_ERR(map)) {
ret = PTR_ERR(map);
goto out_prog_put;
}
mutex_lock(&prog->aux->used_maps_mutex);
used_maps_old = prog->aux->used_maps;
for (i = 0; i < prog->aux->used_map_cnt; i++)
if (used_maps_old[i] == map) {
bpf_map_put(map);
goto out_unlock;
}
used_maps_new = kmalloc_array(prog->aux->used_map_cnt + 1,
sizeof(used_maps_new[0]),
GFP_KERNEL);
if (!used_maps_new) {
ret = -ENOMEM;
goto out_unlock;
}
memcpy(used_maps_new, used_maps_old,
sizeof(used_maps_old[0]) * prog->aux->used_map_cnt);
used_maps_new[prog->aux->used_map_cnt] = map;
prog->aux->used_map_cnt++;
prog->aux->used_maps = used_maps_new;
kfree(used_maps_old);
out_unlock:
mutex_unlock(&prog->aux->used_maps_mutex);
if (ret)
bpf_map_put(map);
out_prog_put:
bpf_prog_put(prog);
return ret;
}
SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, size)
{
union bpf_attr attr;
@@ -4266,6 +4488,9 @@ SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr, unsigned int, siz
case BPF_LINK_DETACH:
err = link_detach(&attr);
break;
case BPF_PROG_BIND_MAP:
err = bpf_prog_bind_map(&attr);
break;
default:
err = -EINVAL;
break;

15
kernel/bpf/task_iter.c
View File

@@ -22,7 +22,8 @@ struct bpf_iter_seq_task_info {
};
static struct task_struct *task_seq_get_next(struct pid_namespace *ns,
u32 *tid)
u32 *tid,
bool skip_if_dup_files)
{
struct task_struct *task = NULL;
struct pid *pid;
@@ -36,6 +37,12 @@ retry:
if (!task) {
++*tid;
goto retry;
} else if (skip_if_dup_files && task->tgid != task->pid &&
task->files == task->group_leader->files) {
put_task_struct(task);
task = NULL;
++*tid;
goto retry;
}
}
rcu_read_unlock();
@@ -48,7 +55,7 @@ static void *task_seq_start(struct seq_file *seq, loff_t *pos)
struct bpf_iter_seq_task_info *info = seq->private;
struct task_struct *task;
task = task_seq_get_next(info->common.ns, &info->tid);
task = task_seq_get_next(info->common.ns, &info->tid, false);
if (!task)
return NULL;
@@ -65,7 +72,7 @@ static void *task_seq_next(struct seq_file *seq, void *v, loff_t *pos)
++*pos;
++info->tid;
put_task_struct((struct task_struct *)v);
task = task_seq_get_next(info->common.ns, &info->tid);
task = task_seq_get_next(info->common.ns, &info->tid, false);
if (!task)
return NULL;
@@ -148,7 +155,7 @@ again:
curr_files = *fstruct;
curr_fd = info->fd;
} else {
curr_task = task_seq_get_next(ns, &curr_tid);
curr_task = task_seq_get_next(ns, &curr_tid, true);
if (!curr_task)
return NULL;

63
kernel/bpf/trampoline.c
View File

@@ -7,6 +7,8 @@
#include <linux/rbtree_latch.h>
#include <linux/perf_event.h>
#include <linux/btf.h>
#include <linux/rcupdate_trace.h>
#include <linux/rcupdate_wait.h>
/* dummy _ops. The verifier will operate on target program's ops. */
const struct bpf_verifier_ops bpf_extension_verifier_ops = {
@@ -63,7 +65,7 @@ static void bpf_trampoline_ksym_add(struct bpf_trampoline *tr)
bpf_image_ksym_add(tr->image, ksym);
}
struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
static struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
{
struct bpf_trampoline *tr;
struct hlist_head *head;
@@ -210,9 +212,12 @@ static int bpf_trampoline_update(struct bpf_trampoline *tr)
* updates to trampoline would change the code from underneath the
* preempted task. Hence wait for tasks to voluntarily schedule or go
* to userspace.
* The same trampoline can hold both sleepable and non-sleepable progs.
* synchronize_rcu_tasks_trace() is needed to make sure all sleepable
* programs finish executing.
* Wait for these two grace periods together.
*/
synchronize_rcu_tasks();
synchronize_rcu_mult(call_rcu_tasks, call_rcu_tasks_trace);
err = arch_prepare_bpf_trampoline(new_image, new_image + PAGE_SIZE / 2,
&tr->func.model, flags, tprogs,
@@ -256,14 +261,12 @@ static enum bpf_tramp_prog_type bpf_attach_type_to_tramp(struct bpf_prog *prog)
}
}
int bpf_trampoline_link_prog(struct bpf_prog *prog)
int bpf_trampoline_link_prog(struct bpf_prog *prog, struct bpf_trampoline *tr)
{
enum bpf_tramp_prog_type kind;
struct bpf_trampoline *tr;
int err = 0;
int cnt;
tr = prog->aux->trampoline;
kind = bpf_attach_type_to_tramp(prog);
mutex_lock(&tr->mutex);
if (tr->extension_prog) {
@@ -296,7 +299,7 @@ int bpf_trampoline_link_prog(struct bpf_prog *prog)
}
hlist_add_head(&prog->aux->tramp_hlist, &tr->progs_hlist[kind]);
tr->progs_cnt[kind]++;
err = bpf_trampoline_update(prog->aux->trampoline);
err = bpf_trampoline_update(tr);
if (err) {
hlist_del(&prog->aux->tramp_hlist);
tr->progs_cnt[kind]--;
@@ -307,13 +310,11 @@ out:
}
/* bpf_trampoline_unlink_prog() should never fail. */
int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr)
{
enum bpf_tramp_prog_type kind;
struct bpf_trampoline *tr;
int err;
tr = prog->aux->trampoline;
kind = bpf_attach_type_to_tramp(prog);
mutex_lock(&tr->mutex);
if (kind == BPF_TRAMP_REPLACE) {
@@ -325,12 +326,32 @@ int bpf_trampoline_unlink_prog(struct bpf_prog *prog)
}
hlist_del(&prog->aux->tramp_hlist);
tr->progs_cnt[kind]--;
err = bpf_trampoline_update(prog->aux->trampoline);
err = bpf_trampoline_update(tr);
out:
mutex_unlock(&tr->mutex);
return err;
}
struct bpf_trampoline *bpf_trampoline_get(u64 key,
struct bpf_attach_target_info *tgt_info)
{
struct bpf_trampoline *tr;
tr = bpf_trampoline_lookup(key);
if (!tr)
return NULL;
mutex_lock(&tr->mutex);
if (tr->func.addr)
goto out;
memcpy(&tr->func.model, &tgt_info->fmodel, sizeof(tgt_info->fmodel));
tr->func.addr = (void *)tgt_info->tgt_addr;
out:
mutex_unlock(&tr->mutex);
return tr;
}
void bpf_trampoline_put(struct bpf_trampoline *tr)
{
if (!tr)
@@ -344,7 +365,14 @@ void bpf_trampoline_put(struct bpf_trampoline *tr)
if (WARN_ON_ONCE(!hlist_empty(&tr->progs_hlist[BPF_TRAMP_FEXIT])))
goto out;
bpf_image_ksym_del(&tr->ksym);
/* wait for tasks to get out of trampoline before freeing it */
/* This code will be executed when all bpf progs (both sleepable and
* non-sleepable) went through
* bpf_prog_put()->call_rcu[_tasks_trace]()->bpf_prog_free_deferred().
* Hence no need for another synchronize_rcu_tasks_trace() here,
* but synchronize_rcu_tasks() is still needed, since trampoline
* may not have had any sleepable programs and we need to wait
* for tasks to get out of trampoline code before freeing it.
*/
synchronize_rcu_tasks();
bpf_jit_free_exec(tr->image);
hlist_del(&tr->hlist);
@@ -394,6 +422,17 @@ void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start)
rcu_read_unlock();
}
void notrace __bpf_prog_enter_sleepable(void)
{
rcu_read_lock_trace();
might_fault();
}
void notrace __bpf_prog_exit_sleepable(void)
{
rcu_read_unlock_trace();
}
int __weak
arch_prepare_bpf_trampoline(void *image, void *image_end,
const struct btf_func_model *m, u32 flags,

1382
kernel/bpf/verifier.c
View File

File diff suppressed because it is too large Load Diff