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Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 

Alexei Starovoitov says:

====================
pull-request: bpf-next 2020-02-28

The following pull-request contains BPF updates for your *net-next* tree.

We've added 41 non-merge commits during the last 7 day(s) which contain
a total of 49 files changed, 1383 insertions(+), 499 deletions(-).

The main changes are:

1) BPF and Real-Time nicely co-exist.

2) bpftool feature improvements.

3) retrieve bpf_sk_storage via INET_DIAG.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2020-02-29 15:53:35 -08:00
parent 9a834f9b04 812285fa5a
commit 9f0ca0c1a5
49 changed files with 1385 additions and 501 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
drivers/net/virtio_net.c
View File

@ -371,7 +371,7 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
struct receive_queue *rq,
struct page *page, unsigned int offset,
unsigned int len, unsigned int truesize,
bool hdr_valid)
bool hdr_valid, unsigned int metasize)
{
struct sk_buff *skb;
struct virtio_net_hdr_mrg_rxbuf *hdr;
@ -393,6 +393,7 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
else
hdr_padded_len = sizeof(struct padded_vnet_hdr);
/* hdr_valid means no XDP, so we can copy the vnet header */
if (hdr_valid)
memcpy(hdr, p, hdr_len);
@ -405,6 +406,11 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
copy = skb_tailroom(skb);
skb_put_data(skb, p, copy);
if (metasize) {
__skb_pull(skb, metasize);
skb_metadata_set(skb, metasize);
}
len -= copy;
offset += copy;
@ -450,10 +456,6 @@ static int __virtnet_xdp_xmit_one(struct virtnet_info *vi,
struct virtio_net_hdr_mrg_rxbuf *hdr;
int err;
/* virtqueue want to use data area in-front of packet */
if (unlikely(xdpf->metasize > 0))
return -EOPNOTSUPP;
if (unlikely(xdpf->headroom < vi->hdr_len))
return -EOVERFLOW;
@ -644,6 +646,7 @@ static struct sk_buff *receive_small(struct net_device *dev,
unsigned int delta = 0;
struct page *xdp_page;
int err;
unsigned int metasize = 0;
len -= vi->hdr_len;
stats->bytes += len;
@ -683,8 +686,8 @@ static struct sk_buff *receive_small(struct net_device *dev,
xdp.data_hard_start = buf + VIRTNET_RX_PAD + vi->hdr_len;
xdp.data = xdp.data_hard_start + xdp_headroom;
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = xdp.data + len;
xdp.data_meta = xdp.data;
xdp.rxq = &rq->xdp_rxq;
orig_data = xdp.data;
act = bpf_prog_run_xdp(xdp_prog, &xdp);
@ -695,6 +698,7 @@ static struct sk_buff *receive_small(struct net_device *dev,
/* Recalculate length in case bpf program changed it */
delta = orig_data - xdp.data;
len = xdp.data_end - xdp.data;
metasize = xdp.data - xdp.data_meta;
break;
case XDP_TX:
stats->xdp_tx++;
@ -735,10 +739,13 @@ static struct sk_buff *receive_small(struct net_device *dev,
}
skb_reserve(skb, headroom - delta);
skb_put(skb, len);
if (!delta) {
if (!xdp_prog) {
buf += header_offset;
memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len);
} /* keep zeroed vnet hdr since packet was changed by bpf */
} /* keep zeroed vnet hdr since XDP is loaded */
if (metasize)
skb_metadata_set(skb, metasize);
err:
return skb;
@ -760,8 +767,8 @@ static struct sk_buff *receive_big(struct net_device *dev,
struct virtnet_rq_stats *stats)
{
struct page *page = buf;
struct sk_buff *skb = page_to_skb(vi, rq, page, 0, len,
PAGE_SIZE, true);
struct sk_buff *skb =
page_to_skb(vi, rq, page, 0, len, PAGE_SIZE, true, 0);
stats->bytes += len - vi->hdr_len;
if (unlikely(!skb))
@ -793,6 +800,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
unsigned int truesize;
unsigned int headroom = mergeable_ctx_to_headroom(ctx);
int err;
unsigned int metasize = 0;
head_skb = NULL;
stats->bytes += len - vi->hdr_len;
@ -839,8 +847,8 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
data = page_address(xdp_page) + offset;
xdp.data_hard_start = data - VIRTIO_XDP_HEADROOM + vi->hdr_len;
xdp.data = data + vi->hdr_len;
xdp_set_data_meta_invalid(&xdp);
xdp.data_end = xdp.data + (len - vi->hdr_len);
xdp.data_meta = xdp.data;
xdp.rxq = &rq->xdp_rxq;
act = bpf_prog_run_xdp(xdp_prog, &xdp);
@ -848,24 +856,27 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
switch (act) {
case XDP_PASS:
/* recalculate offset to account for any header
* adjustments. Note other cases do not build an
* skb and avoid using offset
*/
offset = xdp.data -
page_address(xdp_page) - vi->hdr_len;
metasize = xdp.data - xdp.data_meta;
/* recalculate len if xdp.data or xdp.data_end were
* adjusted
/* recalculate offset to account for any header
* adjustments and minus the metasize to copy the
* metadata in page_to_skb(). Note other cases do not
* build an skb and avoid using offset
*/
len = xdp.data_end - xdp.data + vi->hdr_len;
offset = xdp.data - page_address(xdp_page) -
vi->hdr_len - metasize;
/* recalculate len if xdp.data, xdp.data_end or
* xdp.data_meta were adjusted
*/
len = xdp.data_end - xdp.data + vi->hdr_len + metasize;
/* We can only create skb based on xdp_page. */
if (unlikely(xdp_page != page)) {
rcu_read_unlock();
put_page(page);
head_skb = page_to_skb(vi, rq, xdp_page,
offset, len,
PAGE_SIZE, false);
head_skb = page_to_skb(vi, rq, xdp_page, offset,
len, PAGE_SIZE, false,
metasize);
return head_skb;
}
break;
@ -921,7 +932,8 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
goto err_skb;
}
head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog);
head_skb = page_to_skb(vi, rq, page, offset, len, truesize, !xdp_prog,
metasize);
curr_skb = head_skb;
if (unlikely(!curr_skb))

2
include/linux/bpf-cgroup.h
View File

@ -36,7 +36,7 @@ struct bpf_cgroup_storage_map;
struct bpf_storage_buffer {
struct rcu_head rcu;
char data[0];
char data[];
};
struct bpf_cgroup_storage {

41
include/linux/bpf.h
View File

@ -859,7 +859,7 @@ struct bpf_prog_array_item {
struct bpf_prog_array {
struct rcu_head rcu;
struct bpf_prog_array_item items[0];
struct bpf_prog_array_item items[];
};
struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags);
@ -885,7 +885,7 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array,
struct bpf_prog *_prog; \
struct bpf_prog_array *_array; \
u32 _ret = 1; \
preempt_disable(); \
migrate_disable(); \
rcu_read_lock(); \
_array = rcu_dereference(array); \
if (unlikely(check_non_null && !_array))\
@ -898,7 +898,7 @@ int bpf_prog_array_copy(struct bpf_prog_array *old_array,
} \
_out: \
rcu_read_unlock(); \
preempt_enable(); \
migrate_enable(); \
_ret; \
})
@ -932,7 +932,7 @@ _out: \
u32 ret; \
u32 _ret = 1; \
u32 _cn = 0; \
preempt_disable(); \
migrate_disable(); \
rcu_read_lock(); \
_array = rcu_dereference(array); \
_item = &_array->items[0]; \
@ -944,7 +944,7 @@ _out: \
_item++; \
} \
rcu_read_unlock(); \
preempt_enable(); \
migrate_enable(); \
if (_ret) \
_ret = (_cn ? NET_XMIT_CN : NET_XMIT_SUCCESS); \
else \
@ -961,6 +961,36 @@ _out: \
#ifdef CONFIG_BPF_SYSCALL
DECLARE_PER_CPU(int, bpf_prog_active);
/*
* Block execution of BPF programs attached to instrumentation (perf,
* kprobes, tracepoints) to prevent deadlocks on map operations as any of
* these events can happen inside a region which holds a map bucket lock
* and can deadlock on it.
*
* Use the preemption safe inc/dec variants on RT because migrate disable
* is preemptible on RT and preemption in the middle of the RMW operation
* might lead to inconsistent state. Use the raw variants for non RT
* kernels as migrate_disable() maps to preempt_disable() so the slightly
* more expensive save operation can be avoided.
*/
static inline void bpf_disable_instrumentation(void)
{
migrate_disable();
if (IS_ENABLED(CONFIG_PREEMPT_RT))
this_cpu_inc(bpf_prog_active);
else
__this_cpu_inc(bpf_prog_active);
}
static inline void bpf_enable_instrumentation(void)
{
if (IS_ENABLED(CONFIG_PREEMPT_RT))
this_cpu_dec(bpf_prog_active);
else
__this_cpu_dec(bpf_prog_active);
migrate_enable();
}
extern const struct file_operations bpf_map_fops;
extern const struct file_operations bpf_prog_fops;
@ -993,6 +1023,7 @@ void __bpf_free_used_maps(struct bpf_prog_aux *aux,
void bpf_prog_free_id(struct bpf_prog *prog, bool do_idr_lock);
void bpf_map_free_id(struct bpf_map *map, bool do_idr_lock);
struct bpf_map *bpf_map_get(u32 ufd);
struct bpf_map *bpf_map_get_with_uref(u32 ufd);
struct bpf_map *__bpf_map_get(struct fd f);
void bpf_map_inc(struct bpf_map *map);

37
include/linux/filter.h
View File

@ -561,7 +561,7 @@ DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
#define __BPF_PROG_RUN(prog, ctx, dfunc) ({ \
u32 ret; \
cant_sleep(); \
cant_migrate(); \
if (static_branch_unlikely(&bpf_stats_enabled_key)) { \
struct bpf_prog_stats *stats; \
u64 start = sched_clock(); \
@ -576,8 +576,30 @@ DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
} \
ret; })
#define BPF_PROG_RUN(prog, ctx) __BPF_PROG_RUN(prog, ctx, \
bpf_dispatcher_nopfunc)
#define BPF_PROG_RUN(prog, ctx) \
__BPF_PROG_RUN(prog, ctx, bpf_dispatcher_nopfunc)
/*
* Use in preemptible and therefore migratable context to make sure that
* the execution of the BPF program runs on one CPU.
*
* This uses migrate_disable/enable() explicitly to document that the
* invocation of a BPF program does not require reentrancy protection
* against a BPF program which is invoked from a preempting task.
*
* For non RT enabled kernels migrate_disable/enable() maps to
* preempt_disable/enable(), i.e. it disables also preemption.
*/
static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
const void *ctx)
{
u32 ret;
migrate_disable();
ret = __BPF_PROG_RUN(prog, ctx, bpf_dispatcher_nopfunc);
migrate_enable();
return ret;
}
#define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
@ -655,6 +677,7 @@ static inline u8 *bpf_skb_cb(struct sk_buff *skb)
return qdisc_skb_cb(skb)->data;
}
/* Must be invoked with migration disabled */
static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
struct sk_buff *skb)
{
@ -680,9 +703,9 @@ static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
{
u32 res;
preempt_disable();
migrate_disable();
res = __bpf_prog_run_save_cb(prog, skb);
preempt_enable();
migrate_enable();
return res;
}
@ -695,9 +718,7 @@ static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
if (unlikely(prog->cb_access))
memset(cb_data, 0, BPF_SKB_CB_LEN);
preempt_disable();
res = BPF_PROG_RUN(prog, skb);
preempt_enable();
res = bpf_prog_run_pin_on_cpu(prog, skb);
return res;
}

27
include/linux/inet_diag.h
View File

@ -15,11 +15,9 @@ struct netlink_callback;
struct inet_diag_handler {
void (*dump)(struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
struct nlattr *bc);
const struct inet_diag_req_v2 *r);
int (*dump_one)(struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
int (*dump_one)(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req);
void (*idiag_get_info)(struct sock *sk,
@ -40,18 +38,25 @@ struct inet_diag_handler {
__u16 idiag_info_size;
};
struct bpf_sk_storage_diag;
struct inet_diag_dump_data {
struct nlattr *req_nlas[__INET_DIAG_REQ_MAX];
#define inet_diag_nla_bc req_nlas[INET_DIAG_REQ_BYTECODE]
#define inet_diag_nla_bpf_stgs req_nlas[INET_DIAG_REQ_SK_BPF_STORAGES]
struct bpf_sk_storage_diag *bpf_stg_diag;
};
struct inet_connection_sock;
int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
struct sk_buff *skb, const struct inet_diag_req_v2 *req,
struct user_namespace *user_ns,
u32 pid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh, bool net_admin);
struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *req,
u16 nlmsg_flags, bool net_admin);
void inet_diag_dump_icsk(struct inet_hashinfo *h, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
struct nlattr *bc);
const struct inet_diag_req_v2 *r);
int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
struct sk_buff *in_skb, const struct nlmsghdr *nlh,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *req);
struct sock *inet_diag_find_one_icsk(struct net *net,

7
include/linux/kernel.h
View File

@ -257,6 +257,13 @@ extern void __cant_sleep(const char *file, int line, int preempt_offset);
#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
#ifndef CONFIG_PREEMPT_RT
# define cant_migrate() cant_sleep()
#else
/* Placeholder for now */
# define cant_migrate() do { } while (0)
#endif
/**
* abs - return absolute value of an argument
* @x: the value. If it is unsigned type, it is converted to signed type first.

4
include/linux/netlink.h
View File

@ -188,10 +188,10 @@ struct netlink_callback {
struct module *module;
struct netlink_ext_ack *extack;
u16 family;
u16 min_dump_alloc;
bool strict_check;
u16 answer_flags;
u32 min_dump_alloc;
unsigned int prev_seq, seq;
bool strict_check;
union {
u8 ctx[48];

30
include/linux/preempt.h
View File

@ -322,4 +322,34 @@ static inline void preempt_notifier_init(struct preempt_notifier *notifier,
#endif
/**
* migrate_disable - Prevent migration of the current task
*
* Maps to preempt_disable() which also disables preemption. Use
* migrate_disable() to annotate that the intent is to prevent migration,
* but not necessarily preemption.
*
* Can be invoked nested like preempt_disable() and needs the corresponding
* number of migrate_enable() invocations.
*/
static __always_inline void migrate_disable(void)
{
preempt_disable();
}
/**
* migrate_enable - Allow migration of the current task
*
* Counterpart to migrate_disable().
*
* As migrate_disable() can be invoked nested, only the outermost invocation
* reenables migration.
*
* Currently mapped to preempt_enable().
*/
static __always_inline void migrate_enable(void)
{
preempt_enable();
}
#endif /* __LINUX_PREEMPT_H */

27
include/net/bpf_sk_storage.h
View File

@ -10,14 +10,41 @@ void bpf_sk_storage_free(struct sock *sk);
extern const struct bpf_func_proto bpf_sk_storage_get_proto;
extern const struct bpf_func_proto bpf_sk_storage_delete_proto;
struct bpf_sk_storage_diag;
struct sk_buff;
struct nlattr;
struct sock;
#ifdef CONFIG_BPF_SYSCALL
int bpf_sk_storage_clone(const struct sock *sk, struct sock *newsk);
struct bpf_sk_storage_diag *
bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs);
void bpf_sk_storage_diag_free(struct bpf_sk_storage_diag *diag);
int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
struct sock *sk, struct sk_buff *skb,
int stg_array_type,
unsigned int *res_diag_size);
#else
static inline int bpf_sk_storage_clone(const struct sock *sk,
struct sock *newsk)
{
return 0;
}
static inline struct bpf_sk_storage_diag *
bpf_sk_storage_diag_alloc(const struct nlattr *nla)
{
return NULL;
}
static inline void bpf_sk_storage_diag_free(struct bpf_sk_storage_diag *diag)
{
}
static inline int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
struct sock *sk, struct sk_buff *skb,
int stg_array_type,
unsigned int *res_diag_size)
{
return 0;
}
#endif
#endif /* _BPF_SK_STORAGE_H */

2
include/uapi/linux/bpf.h
View File

@ -73,7 +73,7 @@ struct bpf_insn {
/* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */
struct bpf_lpm_trie_key {
__u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */
__u8 data[0]; /* Arbitrary size */
__u8 data[]; /* Arbitrary size */
};
struct bpf_cgroup_storage_key {

5
include/uapi/linux/inet_diag.h
View File

@ -64,9 +64,11 @@ struct inet_diag_req_raw {
enum {
INET_DIAG_REQ_NONE,
INET_DIAG_REQ_BYTECODE,
INET_DIAG_REQ_SK_BPF_STORAGES,
__INET_DIAG_REQ_MAX,
};
#define INET_DIAG_REQ_MAX INET_DIAG_REQ_BYTECODE
#define INET_DIAG_REQ_MAX (__INET_DIAG_REQ_MAX - 1)
/* Bytecode is sequence of 4 byte commands followed by variable arguments.
* All the commands identified by "code" are conditional jumps forward:
@ -154,6 +156,7 @@ enum {
INET_DIAG_CLASS_ID, /* request as INET_DIAG_TCLASS */
INET_DIAG_MD5SIG,
INET_DIAG_ULP_INFO,
INET_DIAG_SK_BPF_STORAGES,
__INET_DIAG_MAX,
};

26
include/uapi/linux/sock_diag.h
View File

@ -36,4 +36,30 @@ enum sknetlink_groups {
};
#define SKNLGRP_MAX (__SKNLGRP_MAX - 1)
enum {
SK_DIAG_BPF_STORAGE_REQ_NONE,
SK_DIAG_BPF_STORAGE_REQ_MAP_FD,
__SK_DIAG_BPF_STORAGE_REQ_MAX,
};
#define SK_DIAG_BPF_STORAGE_REQ_MAX (__SK_DIAG_BPF_STORAGE_REQ_MAX - 1)
enum {
SK_DIAG_BPF_STORAGE_REP_NONE,
SK_DIAG_BPF_STORAGE,
__SK_DIAG_BPF_STORAGE_REP_MAX,
};
#define SK_DIAB_BPF_STORAGE_REP_MAX (__SK_DIAG_BPF_STORAGE_REP_MAX - 1)
enum {
SK_DIAG_BPF_STORAGE_NONE,
SK_DIAG_BPF_STORAGE_PAD,
SK_DIAG_BPF_STORAGE_MAP_ID,
SK_DIAG_BPF_STORAGE_MAP_VALUE,
__SK_DIAG_BPF_STORAGE_MAX,
};
#define SK_DIAG_BPF_STORAGE_MAX (__SK_DIAG_BPF_STORAGE_MAX - 1)
#endif /* _UAPI__SOCK_DIAG_H__ */

2
kernel/bpf/bpf_struct_ops.c
View File

@ -23,7 +23,7 @@ enum bpf_struct_ops_state {
struct bpf_struct_ops_value {
BPF_STRUCT_OPS_COMMON_VALUE;
char data[0] ____cacheline_aligned_in_smp;
char data[] ____cacheline_aligned_in_smp;
};
struct bpf_struct_ops_map {

174
kernel/bpf/hashtab.c
View File

@ -27,9 +27,62 @@
.map_delete_batch = \
generic_map_delete_batch
/*
* The bucket lock has two protection scopes:
*
* 1) Serializing concurrent operations from BPF programs on differrent
* CPUs
*
* 2) Serializing concurrent operations from BPF programs and sys_bpf()
*
* BPF programs can execute in any context including perf, kprobes and
* tracing. As there are almost no limits where perf, kprobes and tracing
* can be invoked from the lock operations need to be protected against
* deadlocks. Deadlocks can be caused by recursion and by an invocation in
* the lock held section when functions which acquire this lock are invoked
* from sys_bpf(). BPF recursion is prevented by incrementing the per CPU
* variable bpf_prog_active, which prevents BPF programs attached to perf
* events, kprobes and tracing to be invoked before the prior invocation
* from one of these contexts completed. sys_bpf() uses the same mechanism
* by pinning the task to the current CPU and incrementing the recursion
* protection accross the map operation.
*
* This has subtle implications on PREEMPT_RT. PREEMPT_RT forbids certain
* operations like memory allocations (even with GFP_ATOMIC) from atomic
* contexts. This is required because even with GFP_ATOMIC the memory
* allocator calls into code pathes which acquire locks with long held lock
* sections. To ensure the deterministic behaviour these locks are regular
* spinlocks, which are converted to 'sleepable' spinlocks on RT. The only
* true atomic contexts on an RT kernel are the low level hardware
* handling, scheduling, low level interrupt handling, NMIs etc. None of
* these contexts should ever do memory allocations.
*
* As regular device interrupt handlers and soft interrupts are forced into
* thread context, the existing code which does
* spin_lock*(); alloc(GPF_ATOMIC); spin_unlock*();
* just works.
*
* In theory the BPF locks could be converted to regular spinlocks as well,
* but the bucket locks and percpu_freelist locks can be taken from
* arbitrary contexts (perf, kprobes, tracepoints) which are required to be
* atomic contexts even on RT. These mechanisms require preallocated maps,
* so there is no need to invoke memory allocations within the lock held
* sections.
*
* BPF maps which need dynamic allocation are only used from (forced)
* thread context on RT and can therefore use regular spinlocks which in
* turn allows to invoke memory allocations from the lock held section.
*
* On a non RT kernel this distinction is neither possible nor required.
* spinlock maps to raw_spinlock and the extra code is optimized out by the
* compiler.
*/
struct bucket {
struct hlist_nulls_head head;
raw_spinlock_t lock;
union {
raw_spinlock_t raw_lock;
spinlock_t lock;
};
};
struct bpf_htab {
@ -65,9 +118,54 @@ struct htab_elem {
struct bpf_lru_node lru_node;
};
u32 hash;
char key[0] __aligned(8);
char key[] __aligned(8);
};
static inline bool htab_is_prealloc(const struct bpf_htab *htab)
{
return !(htab->map.map_flags & BPF_F_NO_PREALLOC);
}
static inline bool htab_use_raw_lock(const struct bpf_htab *htab)
{
return (!IS_ENABLED(CONFIG_PREEMPT_RT) || htab_is_prealloc(htab));
}
static void htab_init_buckets(struct bpf_htab *htab)
{
unsigned i;
for (i = 0; i < htab->n_buckets; i++) {
INIT_HLIST_NULLS_HEAD(&htab->buckets[i].head, i);
if (htab_use_raw_lock(htab))
raw_spin_lock_init(&htab->buckets[i].raw_lock);
else
spin_lock_init(&htab->buckets[i].lock);
}
}
static inline unsigned long htab_lock_bucket(const struct bpf_htab *htab,
struct bucket *b)
{
unsigned long flags;
if (htab_use_raw_lock(htab))
raw_spin_lock_irqsave(&b->raw_lock, flags);
else
spin_lock_irqsave(&b->lock, flags);
return flags;
}
static inline void htab_unlock_bucket(const struct bpf_htab *htab,
struct bucket *b,
unsigned long flags)
{
if (htab_use_raw_lock(htab))
raw_spin_unlock_irqrestore(&b->raw_lock, flags);
else
spin_unlock_irqrestore(&b->lock, flags);
}
static bool htab_lru_map_delete_node(void *arg, struct bpf_lru_node *node);
static bool htab_is_lru(const struct bpf_htab *htab)
@ -82,11 +180,6 @@ static bool htab_is_percpu(const struct bpf_htab *htab)
htab->map.map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH;
}
static bool htab_is_prealloc(const struct bpf_htab *htab)
{
return !(htab->map.map_flags & BPF_F_NO_PREALLOC);
}
static inline void htab_elem_set_ptr(struct htab_elem *l, u32 key_size,
void __percpu *pptr)
{
@ -328,8 +421,8 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
bool percpu_lru = (attr->map_flags & BPF_F_NO_COMMON_LRU);
bool prealloc = !(attr->map_flags & BPF_F_NO_PREALLOC);
struct bpf_htab *htab;
int err, i;
u64 cost;
int err;
htab = kzalloc(sizeof(*htab), GFP_USER);
if (!htab)
@ -391,10 +484,7 @@ static struct bpf_map *htab_map_alloc(union bpf_attr *attr)
else
htab->hashrnd = get_random_int();
for (i = 0; i < htab->n_buckets; i++) {
INIT_HLIST_NULLS_HEAD(&htab->buckets[i].head, i);
raw_spin_lock_init(&htab->buckets[i].lock);
}
htab_init_buckets(htab);
if (prealloc) {
err = prealloc_init(htab);
@ -602,7 +692,7 @@ static bool htab_lru_map_delete_node(void *arg, struct bpf_lru_node *node)
b = __select_bucket(htab, tgt_l->hash);
head = &b->head;
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
hlist_nulls_for_each_entry_rcu(l, n, head, hash_node)
if (l == tgt_l) {
@ -610,7 +700,7 @@ static bool htab_lru_map_delete_node(void *arg, struct bpf_lru_node *node)
break;
}
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
return l == tgt_l;
}
@ -686,15 +776,7 @@ static void htab_elem_free_rcu(struct rcu_head *head)
struct htab_elem *l = container_of(head, struct htab_elem, rcu);
struct bpf_htab *htab = l->htab;
/* must increment bpf_prog_active to avoid kprobe+bpf triggering while
* we're calling kfree, otherwise deadlock is possible if kprobes
* are placed somewhere inside of slub
*/
preempt_disable();
__this_cpu_inc(bpf_prog_active);
htab_elem_free(htab, l);
__this_cpu_dec(bpf_prog_active);
preempt_enable();
}
static void free_htab_elem(struct bpf_htab *htab, struct htab_elem *l)
@ -884,8 +966,7 @@ static int htab_map_update_elem(struct bpf_map *map, void *key, void *value,
*/
}
/* bpf_map_update_elem() can be called in_irq() */
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
l_old = lookup_elem_raw(head, hash, key, key_size);
@ -926,7 +1007,7 @@ static int htab_map_update_elem(struct bpf_map *map, void *key, void *value,
}
ret = 0;
err:
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
return ret;
}
@ -964,8 +1045,7 @@ static int htab_lru_map_update_elem(struct bpf_map *map, void *key, void *value,
return -ENOMEM;
memcpy(l_new->key + round_up(map->key_size, 8), value, map->value_size);
/* bpf_map_update_elem() can be called in_irq() */
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
l_old = lookup_elem_raw(head, hash, key, key_size);
@ -984,7 +1064,7 @@ static int htab_lru_map_update_elem(struct bpf_map *map, void *key, void *value,
ret = 0;
err:
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
if (ret)
bpf_lru_push_free(&htab->lru, &l_new->lru_node);
@ -1019,8 +1099,7 @@ static int __htab_percpu_map_update_elem(struct bpf_map *map, void *key,
b = __select_bucket(htab, hash);
head = &b->head;
/* bpf_map_update_elem() can be called in_irq() */
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
l_old = lookup_elem_raw(head, hash, key, key_size);
@ -1043,7 +1122,7 @@ static int __htab_percpu_map_update_elem(struct bpf_map *map, void *key,
}
ret = 0;
err:
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
return ret;
}
@ -1083,8 +1162,7 @@ static int __htab_lru_percpu_map_update_elem(struct bpf_map *map, void *key,
return -ENOMEM;
}
/* bpf_map_update_elem() can be called in_irq() */
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
l_old = lookup_elem_raw(head, hash, key, key_size);
@ -1106,7 +1184,7 @@ static int __htab_lru_percpu_map_update_elem(struct bpf_map *map, void *key,
}
ret = 0;
err:
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
if (l_new)
bpf_lru_push_free(&htab->lru, &l_new->lru_node);
return ret;
@ -1144,7 +1222,7 @@ static int htab_map_delete_elem(struct bpf_map *map, void *key)
b = __select_bucket(htab, hash);
head = &b->head;
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
l = lookup_elem_raw(head, hash, key, key_size);
@ -1154,7 +1232,7 @@ static int htab_map_delete_elem(struct bpf_map *map, void *key)
ret = 0;
}
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
return ret;
}
@ -1176,7 +1254,7 @@ static int htab_lru_map_delete_elem(struct bpf_map *map, void *key)
b = __select_bucket(htab, hash);
head = &b->head;
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
l = lookup_elem_raw(head, hash, key, key_size);
@ -1185,7 +1263,7 @@ static int htab_lru_map_delete_elem(struct bpf_map *map, void *key)
ret = 0;
}
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
if (l)
bpf_lru_push_free(&htab->lru, &l->lru_node);
return ret;
@ -1325,8 +1403,7 @@ alloc:
}
again:
preempt_disable();
this_cpu_inc(bpf_prog_active);
bpf_disable_instrumentation();
rcu_read_lock();
again_nocopy:
dst_key = keys;
@ -1335,7 +1412,7 @@ again_nocopy:
head = &b->head;
/* do not grab the lock unless need it (bucket_cnt > 0). */
if (locked)
raw_spin_lock_irqsave(&b->lock, flags);
flags = htab_lock_bucket(htab, b);
bucket_cnt = 0;
hlist_nulls_for_each_entry_rcu(l, n, head, hash_node)
@ -1352,10 +1429,9 @@ again_nocopy:
/* Note that since bucket_cnt > 0 here, it is implicit
* that the locked was grabbed, so release it.
*/
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
rcu_read_unlock();
this_cpu_dec(bpf_prog_active);
preempt_enable();
bpf_enable_instrumentation();
goto after_loop;
}
@ -1364,10 +1440,9 @@ again_nocopy:
/* Note that since bucket_cnt > 0 here, it is implicit
* that the locked was grabbed, so release it.
*/
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
rcu_read_unlock();
this_cpu_dec(bpf_prog_active);
preempt_enable();
bpf_enable_instrumentation();
kvfree(keys);
kvfree(values);
goto alloc;
@ -1418,7 +1493,7 @@ again_nocopy:
dst_val += value_size;
}
raw_spin_unlock_irqrestore(&b->lock, flags);
htab_unlock_bucket(htab, b, flags);
locked = false;
while (node_to_free) {
@ -1437,8 +1512,7 @@ next_batch:
}
rcu_read_unlock();
this_cpu_dec(bpf_prog_active);
preempt_enable();
bpf_enable_instrumentation();
if (bucket_cnt && (copy_to_user(ukeys + total * key_size, keys,
key_size * bucket_cnt) ||
copy_to_user(uvalues + total * value_size, values,

14
kernel/bpf/lpm_trie.c
View File

@ -25,7 +25,7 @@ struct lpm_trie_node {
struct lpm_trie_node __rcu *child[2];
u32 prefixlen;
u32 flags;
u8 data[0];
u8 data[];
};
struct lpm_trie {
@ -34,7 +34,7 @@ struct lpm_trie {
size_t n_entries;
size_t max_prefixlen;
size_t data_size;
raw_spinlock_t lock;
spinlock_t lock;
};
/* This trie implements a longest prefix match algorithm that can be used to
@ -315,7 +315,7 @@ static int trie_update_elem(struct bpf_map *map,
if (key->prefixlen > trie->max_prefixlen)
return -EINVAL;
raw_spin_lock_irqsave(&trie->lock, irq_flags);
spin_lock_irqsave(&trie->lock, irq_flags);
/* Allocate and fill a new node */
@ -422,7 +422,7 @@ out:
kfree(im_node);
}
raw_spin_unlock_irqrestore(&trie->lock, irq_flags);
spin_unlock_irqrestore(&trie->lock, irq_flags);
return ret;
}
@ -442,7 +442,7 @@ static int trie_delete_elem(struct bpf_map *map, void *_key)
if (key->prefixlen > trie->max_prefixlen)
return -EINVAL;
raw_spin_lock_irqsave(&trie->lock, irq_flags);
spin_lock_irqsave(&trie->lock, irq_flags);
/* Walk the tree looking for an exact key/length match and keeping
* track of the path we traverse. We will need to know the node
@ -518,7 +518,7 @@ static int trie_delete_elem(struct bpf_map *map, void *_key)
kfree_rcu(node, rcu);
out:
raw_spin_unlock_irqrestore(&trie->lock, irq_flags);
spin_unlock_irqrestore(&trie->lock, irq_flags);
return ret;
}
@ -575,7 +575,7 @@ static struct bpf_map *trie_alloc(union bpf_attr *attr)
if (ret)
goto out_err;
raw_spin_lock_init(&trie->lock);
spin_lock_init(&trie->lock);
return &trie->map;
out_err:

20
kernel/bpf/percpu_freelist.c
View File

@ -25,12 +25,18 @@ void pcpu_freelist_destroy(struct pcpu_freelist *s)
free_percpu(s->freelist);
}
static inline void pcpu_freelist_push_node(struct pcpu_freelist_head *head,
struct pcpu_freelist_node *node)
{
node->next = head->first;
head->first = node;
}
static inline void ___pcpu_freelist_push(struct pcpu_freelist_head *head,
struct pcpu_freelist_node *node)
{
raw_spin_lock(&head->lock);
node->next = head->first;
head->first = node;
pcpu_freelist_push_node(head, node);
raw_spin_unlock(&head->lock);
}
@ -56,21 +62,16 @@ void pcpu_freelist_populate(struct pcpu_freelist *s, void *buf, u32 elem_size,
u32 nr_elems)
{
struct pcpu_freelist_head *head;
unsigned long flags;
int i, cpu, pcpu_entries;
pcpu_entries = nr_elems / num_possible_cpus() + 1;
i = 0;
/* disable irq to workaround lockdep false positive
* in bpf usage pcpu_freelist_populate() will never race
* with pcpu_freelist_push()
*/
local_irq_save(flags);
for_each_possible_cpu(cpu) {
again:
head = per_cpu_ptr(s->freelist, cpu);
___pcpu_freelist_push(head, buf);
/* No locking required as this is not visible yet. */
pcpu_freelist_push_node(head, buf);
i++;
buf += elem_size;
if (i == nr_elems)
@ -78,7 +79,6 @@ again:
if (i % pcpu_entries)
goto again;
}
local_irq_restore(flags);
}
struct pcpu_freelist_node *__pcpu_freelist_pop(struct pcpu_freelist *s)

18
kernel/bpf/stackmap.c
View File

@ -40,6 +40,9 @@ static void do_up_read(struct irq_work *entry)
{
struct stack_map_irq_work *work;
if (WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_RT)))
return;
work = container_of(entry, struct stack_map_irq_work, irq_work);
up_read_non_owner(work->sem);
work->sem = NULL;
@ -288,10 +291,19 @@ static void stack_map_get_build_id_offset(struct bpf_stack_build_id *id_offs,
struct stack_map_irq_work *work = NULL;
if (irqs_disabled()) {
work = this_cpu_ptr(&up_read_work);
if (atomic_read(&work->irq_work.flags) & IRQ_WORK_BUSY)
/* cannot queue more up_read, fallback */
if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
work = this_cpu_ptr(&up_read_work);
if (atomic_read(&work->irq_work.flags) & IRQ_WORK_BUSY) {
/* cannot queue more up_read, fallback */
irq_work_busy = true;
}
} else {
/*
* PREEMPT_RT does not allow to trylock mmap sem in
* interrupt disabled context. Force the fallback code.
*/
irq_work_busy = true;
}
}
/*

42
kernel/bpf/syscall.c
View File

@ -171,11 +171,7 @@ static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key,
flags);
}
/* must increment bpf_prog_active to avoid kprobe+bpf triggering from
* inside bpf map update or delete otherwise deadlocks are possible
*/
preempt_disable();
__this_cpu_inc(bpf_prog_active);
bpf_disable_instrumentation();
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
err = bpf_percpu_hash_update(map, key, value, flags);
@ -206,8 +202,7 @@ static int bpf_map_update_value(struct bpf_map *map, struct fd f, void *key,
err = map->ops->map_update_elem(map, key, value, flags);
rcu_read_unlock();
}
__this_cpu_dec(bpf_prog_active);
preempt_enable();
bpf_enable_instrumentation();
maybe_wait_bpf_programs(map);
return err;
@ -222,8 +217,7 @@ static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
if (bpf_map_is_dev_bound(map))
return bpf_map_offload_lookup_elem(map, key, value);
preempt_disable();
this_cpu_inc(bpf_prog_active);
bpf_disable_instrumentation();
if (map->map_type == BPF_MAP_TYPE_PERCPU_HASH ||
map->map_type == BPF_MAP_TYPE_LRU_PERCPU_HASH) {
err = bpf_percpu_hash_copy(map, key, value);
@ -268,8 +262,7 @@ static int bpf_map_copy_value(struct bpf_map *map, void *key, void *value,
rcu_read_unlock();
}
this_cpu_dec(bpf_prog_active);
preempt_enable();
bpf_enable_instrumentation();
maybe_wait_bpf_programs(map);
return err;
@ -909,6 +902,21 @@ void bpf_map_inc_with_uref(struct bpf_map *map)
}
EXPORT_SYMBOL_GPL(bpf_map_inc_with_uref);
struct bpf_map *bpf_map_get(u32 ufd)
{
struct fd f = fdget(ufd);
struct bpf_map *map;
map = __bpf_map_get(f);
if (IS_ERR(map))
return map;
bpf_map_inc(map);
fdput(f);
return map;
}
struct bpf_map *bpf_map_get_with_uref(u32 ufd)
{
struct fd f = fdget(ufd);
@ -1136,13 +1144,11 @@ static int map_delete_elem(union bpf_attr *attr)
goto out;
}
preempt_disable();
__this_cpu_inc(bpf_prog_active);
bpf_disable_instrumentation();
rcu_read_lock();
err = map->ops->map_delete_elem(map, key);
rcu_read_unlock();
__this_cpu_dec(bpf_prog_active);
preempt_enable();
bpf_enable_instrumentation();
maybe_wait_bpf_programs(map);
out:
kfree(key);
@ -1254,13 +1260,11 @@ int generic_map_delete_batch(struct bpf_map *map,
break;
}
preempt_disable();
__this_cpu_inc(bpf_prog_active);
bpf_disable_instrumentation();
rcu_read_lock();
err = map->ops->map_delete_elem(map, key);
rcu_read_unlock();
__this_cpu_dec(bpf_prog_active);
preempt_enable();
bpf_enable_instrumentation();
maybe_wait_bpf_programs(map);
if (err)
break;

9
kernel/bpf/trampoline.c
View File

@ -367,8 +367,9 @@ out:
mutex_unlock(&trampoline_mutex);
}
/* The logic is similar to BPF_PROG_RUN, but with explicit rcu and preempt that
* are needed for trampoline. The macro is split into
/* The logic is similar to BPF_PROG_RUN, but with an explicit
* rcu_read_lock() and migrate_disable() which are required
* for the trampoline. The macro is split into
* call _bpf_prog_enter
* call prog->bpf_func
* call __bpf_prog_exit
@ -378,7 +379,7 @@ u64 notrace __bpf_prog_enter(void)
u64 start = 0;
rcu_read_lock();
preempt_disable();
migrate_disable();
if (static_branch_unlikely(&bpf_stats_enabled_key))
start = sched_clock();
return start;
@ -401,7 +402,7 @@ void notrace __bpf_prog_exit(struct bpf_prog *prog, u64 start)
stats->nsecs += sched_clock() - start;
u64_stats_update_end(&stats->syncp);
}
preempt_enable();
migrate_enable();
rcu_read_unlock();
}

40
kernel/bpf/verifier.c
View File

@ -8143,26 +8143,48 @@ static bool is_tracing_prog_type(enum bpf_prog_type type)
}
}
static bool is_preallocated_map(struct bpf_map *map)
{
if (!check_map_prealloc(map))
return false;
if (map->inner_map_meta && !check_map_prealloc(map->inner_map_meta))
return false;
return true;
}
static int check_map_prog_compatibility(struct bpf_verifier_env *env,
struct bpf_map *map,
struct bpf_prog *prog)
{
/* Make sure that BPF_PROG_TYPE_PERF_EVENT programs only use
* preallocated hash maps, since doing memory allocation
* in overflow_handler can crash depending on where nmi got
* triggered.
/*
* Validate that trace type programs use preallocated hash maps.
*
* For programs attached to PERF events this is mandatory as the
* perf NMI can hit any arbitrary code sequence.
*
* All other trace types using preallocated hash maps are unsafe as
* well because tracepoint or kprobes can be inside locked regions
* of the memory allocator or at a place where a recursion into the
* memory allocator would see inconsistent state.
*
* On RT enabled kernels run-time allocation of all trace type
* programs is strictly prohibited due to lock type constraints. On
* !RT kernels it is allowed for backwards compatibility reasons for
* now, but warnings are emitted so developers are made aware of
* the unsafety and can fix their programs before this is enforced.
*/
if (prog->type == BPF_PROG_TYPE_PERF_EVENT) {
if (!check_map_prealloc(map)) {
if (is_tracing_prog_type(prog->type) && !is_preallocated_map(map)) {
if (prog->type == BPF_PROG_TYPE_PERF_EVENT) {
verbose(env, "perf_event programs can only use preallocated hash map\n");
return -EINVAL;
}
if (map->inner_map_meta &&
!check_map_prealloc(map->inner_map_meta)) {
verbose(env, "perf_event programs can only use preallocated inner hash map\n");
if (IS_ENABLED(CONFIG_PREEMPT_RT)) {
verbose(env, "trace type programs can only use preallocated hash map\n");
return -EINVAL;
}
WARN_ONCE(1, "trace type BPF program uses run-time allocation\n");
verbose(env, "trace type programs with run-time allocated hash maps are unsafe. Switch to preallocated hash maps.\n");
}
if ((is_tracing_prog_type(prog->type) ||

2
kernel/events/core.c
View File

@ -9206,7 +9206,6 @@ static void bpf_overflow_handler(struct perf_event *event,
int ret = 0;
ctx.regs = perf_arch_bpf_user_pt_regs(regs);
preempt_disable();
if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1))
goto out;
rcu_read_lock();
@ -9214,7 +9213,6 @@ static void bpf_overflow_handler(struct perf_event *event,
rcu_read_unlock();
out:
__this_cpu_dec(bpf_prog_active);
preempt_enable();
if (!ret)
return;

4
kernel/seccomp.c
View File

@ -268,16 +268,14 @@ static u32 seccomp_run_filters(const struct seccomp_data *sd,
* All filters in the list are evaluated and the lowest BPF return
* value always takes priority (ignoring the DATA).
*/
preempt_disable();
for (; f; f = f->prev) {
u32 cur_ret = BPF_PROG_RUN(f->prog, sd);
u32 cur_ret = bpf_prog_run_pin_on_cpu(f->prog, sd);
if (ACTION_ONLY(cur_ret) < ACTION_ONLY(ret)) {
ret = cur_ret;
*match = f;
}
}
preempt_enable();
return ret;
}
#endif /* CONFIG_SECCOMP_FILTER */

7
kernel/trace/bpf_trace.c
View File

@ -83,7 +83,7 @@ unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
if (in_nmi()) /* not supported yet */
return 1;
preempt_disable();
cant_sleep();
if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) {
/*
@ -115,11 +115,9 @@ unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx)
out:
__this_cpu_dec(bpf_prog_active);
preempt_enable();
return ret;
}
EXPORT_SYMBOL_GPL(trace_call_bpf);
#ifdef CONFIG_BPF_KPROBE_OVERRIDE
BPF_CALL_2(bpf_override_return, struct pt_regs *, regs, unsigned long, rc)
@ -1516,10 +1514,9 @@ void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp)
static __always_inline
void __bpf_trace_run(struct bpf_prog *prog, u64 *args)
{
cant_sleep();
rcu_read_lock();
preempt_disable();
(void) BPF_PROG_RUN(prog, args);
preempt_enable();
rcu_read_unlock();
}

11
kernel/trace/trace_uprobe.c
View File

@ -1333,8 +1333,15 @@ static void __uprobe_perf_func(struct trace_uprobe *tu,
int size, esize;
int rctx;
if (bpf_prog_array_valid(call) && !trace_call_bpf(call, regs))
return;
if (bpf_prog_array_valid(call)) {
u32 ret;
preempt_disable();
ret = trace_call_bpf(call, regs);
preempt_enable();
if (!ret)
return;
}
esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));

4
lib/test_bpf.c
View File

@ -6660,14 +6660,14 @@ static int __run_one(const struct bpf_prog *fp, const void *data,
u64 start, finish;
int ret = 0, i;
preempt_disable();
migrate_disable();
start = ktime_get_ns();
for (i = 0; i < runs; i++)
ret = BPF_PROG_RUN(fp, data);
finish = ktime_get_ns();
preempt_enable();
migrate_enable();
*duration = finish - start;
do_div(*duration, runs);

8
net/bpf/test_run.c
View File

@ -37,7 +37,7 @@ static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
repeat = 1;
rcu_read_lock();
preempt_disable();
migrate_disable();
time_start = ktime_get_ns();
for (i = 0; i < repeat; i++) {
bpf_cgroup_storage_set(storage);
@ -54,18 +54,18 @@ static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
if (need_resched()) {
time_spent += ktime_get_ns() - time_start;
preempt_enable();
migrate_enable();
rcu_read_unlock();
cond_resched();
rcu_read_lock();
preempt_disable();
migrate_disable();
time_start = ktime_get_ns();
}
}
time_spent += ktime_get_ns() - time_start;
preempt_enable();
migrate_enable();
rcu_read_unlock();
do_div(time_spent, repeat);

283
net/core/bpf_sk_storage.c
View File

@ -8,6 +8,7 @@
#include <linux/bpf.h>
#include <net/bpf_sk_storage.h>
#include <net/sock.h>
#include <uapi/linux/sock_diag.h>
#include <uapi/linux/btf.h>
static atomic_t cache_idx;
@ -606,6 +607,14 @@ static void bpf_sk_storage_map_free(struct bpf_map *map)
kfree(map);
}
/* U16_MAX is much more than enough for sk local storage
* considering a tcp_sock is ~2k.
*/
#define MAX_VALUE_SIZE \
min_t(u32, \
(KMALLOC_MAX_SIZE - MAX_BPF_STACK - sizeof(struct bpf_sk_storage_elem)), \
(U16_MAX - sizeof(struct bpf_sk_storage_elem)))
static int bpf_sk_storage_map_alloc_check(union bpf_attr *attr)
{
if (attr->map_flags & ~SK_STORAGE_CREATE_FLAG_MASK ||
@ -619,12 +628,7 @@ static int bpf_sk_storage_map_alloc_check(union bpf_attr *attr)
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (attr->value_size >= KMALLOC_MAX_SIZE -
MAX_BPF_STACK - sizeof(struct bpf_sk_storage_elem) ||
/* U16_MAX is much more than enough for sk local storage
* considering a tcp_sock is ~2k.
*/
attr->value_size > U16_MAX - sizeof(struct bpf_sk_storage_elem))
if (attr->value_size > MAX_VALUE_SIZE)
return -E2BIG;
return 0;
@ -910,3 +914,270 @@ const struct bpf_func_proto bpf_sk_storage_delete_proto = {
.arg1_type = ARG_CONST_MAP_PTR,
.arg2_type = ARG_PTR_TO_SOCKET,
};
struct bpf_sk_storage_diag {
u32 nr_maps;
struct bpf_map *maps[];
};
/* The reply will be like:
* INET_DIAG_BPF_SK_STORAGES (nla_nest)
* SK_DIAG_BPF_STORAGE (nla_nest)
* SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
* SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
* SK_DIAG_BPF_STORAGE (nla_nest)
* SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
* SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
* ....
*/
static int nla_value_size(u32 value_size)
{
/* SK_DIAG_BPF_STORAGE (nla_nest)
* SK_DIAG_BPF_STORAGE_MAP_ID (nla_put_u32)
* SK_DIAG_BPF_STORAGE_MAP_VALUE (nla_reserve_64bit)
*/
return nla_total_size(0) + nla_total_size(sizeof(u32)) +
nla_total_size_64bit(value_size);
}
void bpf_sk_storage_diag_free(struct bpf_sk_storage_diag *diag)
{
u32 i;
if (!diag)
return;
for (i = 0; i < diag->nr_maps; i++)
bpf_map_put(diag->maps[i]);
kfree(diag);
}
EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_free);
static bool diag_check_dup(const struct bpf_sk_storage_diag *diag,
const struct bpf_map *map)
{
u32 i;
for (i = 0; i < diag->nr_maps; i++) {
if (diag->maps[i] == map)
return true;
}
return false;
}
struct bpf_sk_storage_diag *
bpf_sk_storage_diag_alloc(const struct nlattr *nla_stgs)
{
struct bpf_sk_storage_diag *diag;
struct nlattr *nla;
u32 nr_maps = 0;
int rem, err;
/* bpf_sk_storage_map is currently limited to CAP_SYS_ADMIN as
* the map_alloc_check() side also does.
*/
if (!capable(CAP_SYS_ADMIN))
return ERR_PTR(-EPERM);
nla_for_each_nested(nla, nla_stgs, rem) {
if (nla_type(nla) == SK_DIAG_BPF_STORAGE_REQ_MAP_FD)
nr_maps++;
}
diag = kzalloc(sizeof(*diag) + sizeof(diag->maps[0]) * nr_maps,
GFP_KERNEL);
if (!diag)
return ERR_PTR(-ENOMEM);
nla_for_each_nested(nla, nla_stgs, rem) {
struct bpf_map *map;
int map_fd;
if (nla_type(nla) != SK_DIAG_BPF_STORAGE_REQ_MAP_FD)
continue;
map_fd = nla_get_u32(nla);
map = bpf_map_get(map_fd);
if (IS_ERR(map)) {
err = PTR_ERR(map);
goto err_free;
}
if (map->map_type != BPF_MAP_TYPE_SK_STORAGE) {
bpf_map_put(map);
err = -EINVAL;
goto err_free;
}
if (diag_check_dup(diag, map)) {
bpf_map_put(map);
err = -EEXIST;
goto err_free;
}
diag->maps[diag->nr_maps++] = map;
}
return diag;
err_free:
bpf_sk_storage_diag_free(diag);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_alloc);
static int diag_get(struct bpf_sk_storage_data *sdata, struct sk_buff *skb)
{
struct nlattr *nla_stg, *nla_value;
struct bpf_sk_storage_map *smap;
/* It cannot exceed max nlattr's payload */
BUILD_BUG_ON(U16_MAX - NLA_HDRLEN < MAX_VALUE_SIZE);
nla_stg = nla_nest_start(skb, SK_DIAG_BPF_STORAGE);
if (!nla_stg)
return -EMSGSIZE;
smap = rcu_dereference(sdata->smap);
if (nla_put_u32(skb, SK_DIAG_BPF_STORAGE_MAP_ID, smap->map.id))
goto errout;
nla_value = nla_reserve_64bit(skb, SK_DIAG_BPF_STORAGE_MAP_VALUE,
smap->map.value_size,
SK_DIAG_BPF_STORAGE_PAD);
if (!nla_value)
goto errout;
if (map_value_has_spin_lock(&smap->map))
copy_map_value_locked(&smap->map, nla_data(nla_value),
sdata->data, true);
else
copy_map_value(&smap->map, nla_data(nla_value), sdata->data);
nla_nest_end(skb, nla_stg);
return 0;
errout:
nla_nest_cancel(skb, nla_stg);
return -EMSGSIZE;
}
static int bpf_sk_storage_diag_put_all(struct sock *sk, struct sk_buff *skb,
int stg_array_type,
unsigned int *res_diag_size)
{
/* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */
unsigned int diag_size = nla_total_size(0);
struct bpf_sk_storage *sk_storage;
struct bpf_sk_storage_elem *selem;
struct bpf_sk_storage_map *smap;
struct nlattr *nla_stgs;
unsigned int saved_len;
int err = 0;
rcu_read_lock();
sk_storage = rcu_dereference(sk->sk_bpf_storage);
if (!sk_storage || hlist_empty(&sk_storage->list)) {
rcu_read_unlock();
return 0;
}
nla_stgs = nla_nest_start(skb, stg_array_type);
if (!nla_stgs)
/* Continue to learn diag_size */
err = -EMSGSIZE;
saved_len = skb->len;
hlist_for_each_entry_rcu(selem, &sk_storage->list, snode) {
smap = rcu_dereference(SDATA(selem)->smap);
diag_size += nla_value_size(smap->map.value_size);
if (nla_stgs && diag_get(SDATA(selem), skb))
/* Continue to learn diag_size */
err = -EMSGSIZE;
}
rcu_read_unlock();
if (nla_stgs) {
if (saved_len == skb->len)
nla_nest_cancel(skb, nla_stgs);
else
nla_nest_end(skb, nla_stgs);
}
if (diag_size == nla_total_size(0)) {
*res_diag_size = 0;
return 0;
}
*res_diag_size = diag_size;
return err;
}
int bpf_sk_storage_diag_put(struct bpf_sk_storage_diag *diag,
struct sock *sk, struct sk_buff *skb,
int stg_array_type,
unsigned int *res_diag_size)
{
/* stg_array_type (e.g. INET_DIAG_BPF_SK_STORAGES) */
unsigned int diag_size = nla_total_size(0);
struct bpf_sk_storage *sk_storage;
struct bpf_sk_storage_data *sdata;
struct nlattr *nla_stgs;
unsigned int saved_len;
int err = 0;
u32 i;
*res_diag_size = 0;
/* No map has been specified. Dump all. */
if (!diag->nr_maps)
return bpf_sk_storage_diag_put_all(sk, skb, stg_array_type,
res_diag_size);
rcu_read_lock();
sk_storage = rcu_dereference(sk->sk_bpf_storage);
if (!sk_storage || hlist_empty(&sk_storage->list)) {
rcu_read_unlock();
return 0;
}
nla_stgs = nla_nest_start(skb, stg_array_type);
if (!nla_stgs)
/* Continue to learn diag_size */
err = -EMSGSIZE;
saved_len = skb->len;
for (i = 0; i < diag->nr_maps; i++) {
sdata = __sk_storage_lookup(sk_storage,
(struct bpf_sk_storage_map *)diag->maps[i],
false);
if (!sdata)
continue;
diag_size += nla_value_size(diag->maps[i]->value_size);
if (nla_stgs && diag_get(sdata, skb))
/* Continue to learn diag_size */
err = -EMSGSIZE;
}
rcu_read_unlock();
if (nla_stgs) {
if (saved_len == skb->len)
nla_nest_cancel(skb, nla_stgs);
else
nla_nest_end(skb, nla_stgs);
}
if (diag_size == nla_total_size(0)) {
*res_diag_size = 0;
return 0;
}
*res_diag_size = diag_size;
return err;
}
EXPORT_SYMBOL_GPL(bpf_sk_storage_diag_put);

4
net/core/flow_dissector.c
View File

@ -920,9 +920,7 @@ bool bpf_flow_dissect(struct bpf_prog *prog, struct bpf_flow_dissector *ctx,
(int)FLOW_DISSECTOR_F_STOP_AT_ENCAP);
flow_keys->flags = flags;
preempt_disable();
result = BPF_PROG_RUN(prog, ctx);
preempt_enable();
result = bpf_prog_run_pin_on_cpu(prog, ctx);
flow_keys->nhoff = clamp_t(u16, flow_keys->nhoff, nhoff, hlen);
flow_keys->thoff = clamp_t(u16, flow_keys->thoff,

8
net/core/skmsg.c
View File

@ -628,7 +628,6 @@ int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
struct bpf_prog *prog;
int ret;
preempt_disable();
rcu_read_lock();
prog = READ_ONCE(psock->progs.msg_parser);
if (unlikely(!prog)) {
@ -638,7 +637,7 @@ int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
sk_msg_compute_data_pointers(msg);
msg->sk = sk;
ret = BPF_PROG_RUN(prog, msg);
ret = bpf_prog_run_pin_on_cpu(prog, msg);
ret = sk_psock_map_verd(ret, msg->sk_redir);
psock->apply_bytes = msg->apply_bytes;
if (ret == __SK_REDIRECT) {
@ -653,7 +652,6 @@ int sk_psock_msg_verdict(struct sock *sk, struct sk_psock *psock,
}
out:
rcu_read_unlock();
preempt_enable();
return ret;
}
EXPORT_SYMBOL_GPL(sk_psock_msg_verdict);
@ -665,9 +663,7 @@ static int sk_psock_bpf_run(struct sk_psock *psock, struct bpf_prog *prog,
skb->sk = psock->sk;
bpf_compute_data_end_sk_skb(skb);
preempt_disable();
ret = BPF_PROG_RUN(prog, skb);
preempt_enable();
ret = bpf_prog_run_pin_on_cpu(prog, skb);
/* strparser clones the skb before handing it to a upper layer,
* meaning skb_orphan has been called. We NULL sk on the way out
* to ensure we don't trigger a BUG_ON() in skb/sk operations

9
net/dccp/diag.c
View File

@ -46,16 +46,15 @@ static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
}
static void dccp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r, bc);
inet_diag_dump_icsk(&dccp_hashinfo, skb, cb, r);
}
static int dccp_diag_dump_one(struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
static int dccp_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
return inet_diag_dump_one_icsk(&dccp_hashinfo, in_skb, nlh, req);
return inet_diag_dump_one_icsk(&dccp_hashinfo, cb, req);
}
static const struct inet_diag_handler dccp_diag_handler = {

307
net/ipv4/inet_diag.c
View File

@ -23,6 +23,7 @@
#include <net/inet_hashtables.h>
#include <net/inet_timewait_sock.h>
#include <net/inet6_hashtables.h>
#include <net/bpf_sk_storage.h>
#include <net/netlink.h>
#include <linux/inet.h>
@ -156,26 +157,28 @@ errout:
}
EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
#define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
struct sk_buff *skb, const struct inet_diag_req_v2 *req,
struct user_namespace *user_ns,
u32 portid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh,
bool net_admin)
struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *req,
u16 nlmsg_flags, bool net_admin)
{
const struct tcp_congestion_ops *ca_ops;
const struct inet_diag_handler *handler;
struct inet_diag_dump_data *cb_data;
int ext = req->idiag_ext;
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
struct nlattr *attr;
void *info = NULL;
cb_data = cb->data;
handler = inet_diag_table[req->sdiag_protocol];
BUG_ON(!handler);
nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
nlmsg_flags);
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
if (!nlh)
return -EMSGSIZE;
@ -187,7 +190,9 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
r->idiag_timer = 0;
r->idiag_retrans = 0;
if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
sk_user_ns(NETLINK_CB(cb->skb).sk),
net_admin))
goto errout;
if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
@ -302,6 +307,48 @@ int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
goto errout;
}
/* Keep it at the end for potential retry with a larger skb,
* or else do best-effort fitting, which is only done for the
* first_nlmsg.
*/
if (cb_data->bpf_stg_diag) {
bool first_nlmsg = ((unsigned char *)nlh == skb->data);
unsigned int prev_min_dump_alloc;
unsigned int total_nla_size = 0;
unsigned int msg_len;
int err;
msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
INET_DIAG_SK_BPF_STORAGES,
&total_nla_size);
if (!err)
goto out;
total_nla_size += msg_len;
prev_min_dump_alloc = cb->min_dump_alloc;
if (total_nla_size > prev_min_dump_alloc)
cb->min_dump_alloc = min_t(u32, total_nla_size,
MAX_DUMP_ALLOC_SIZE);
if (!first_nlmsg)
goto errout;
if (cb->min_dump_alloc > prev_min_dump_alloc)
/* Retry with pskb_expand_head() with
* __GFP_DIRECT_RECLAIM
*/
goto errout;
WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
/* Send what we have for this sk
* and move on to the next sk in the following
* dump()
*/
}
out:
nlmsg_end(skb, nlh);
return 0;
@ -312,30 +359,19 @@ errout:
}
EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
static int inet_csk_diag_fill(struct sock *sk,
struct sk_buff *skb,
const struct inet_diag_req_v2 *req,
struct user_namespace *user_ns,
u32 portid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh,
bool net_admin)
{
return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
portid, seq, nlmsg_flags, unlh, net_admin);
}
static int inet_twsk_diag_fill(struct sock *sk,
struct sk_buff *skb,
u32 portid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh)
struct netlink_callback *cb,
u16 nlmsg_flags)
{
struct inet_timewait_sock *tw = inet_twsk(sk);
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
long tmo;
nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
nlmsg_flags);
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
sizeof(*r), nlmsg_flags);
if (!nlh)
return -EMSGSIZE;
@ -359,16 +395,16 @@ static int inet_twsk_diag_fill(struct sock *sk,
}
static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
u32 portid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh, bool net_admin)
struct netlink_callback *cb,
u16 nlmsg_flags, bool net_admin)
{
struct request_sock *reqsk = inet_reqsk(sk);
struct inet_diag_msg *r;
struct nlmsghdr *nlh;
long tmo;
nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
nlmsg_flags);
nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
if (!nlh)
return -EMSGSIZE;
@ -397,21 +433,18 @@ static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
}
static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
struct user_namespace *user_ns,
u32 portid, u32 seq, u16 nlmsg_flags,
const struct nlmsghdr *unlh, bool net_admin)
u16 nlmsg_flags, bool net_admin)
{
if (sk->sk_state == TCP_TIME_WAIT)
return inet_twsk_diag_fill(sk, skb, portid, seq,
nlmsg_flags, unlh);
return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
if (sk->sk_state == TCP_NEW_SYN_RECV)
return inet_req_diag_fill(sk, skb, portid, seq,
nlmsg_flags, unlh, net_admin);
return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
nlmsg_flags, unlh, net_admin);
return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
net_admin);
}
struct sock *inet_diag_find_one_icsk(struct net *net,
@ -459,10 +492,10 @@ struct sock *inet_diag_find_one_icsk(struct net *net,
EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
struct sk_buff *in_skb = cb->skb;
bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
struct net *net = sock_net(in_skb->sk);
struct sk_buff *rep;
@ -479,10 +512,7 @@ int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
goto out;
}
err = sk_diag_fill(sk, rep, req,
sk_user_ns(NETLINK_CB(in_skb).sk),
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0, nlh, net_admin);
err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
nlmsg_free(rep);
@ -509,14 +539,21 @@ static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
int err;
handler = inet_diag_lock_handler(req->sdiag_protocol);
if (IS_ERR(handler))
if (IS_ERR(handler)) {
err = PTR_ERR(handler);
else if (cmd == SOCK_DIAG_BY_FAMILY)
err = handler->dump_one(in_skb, nlh, req);
else if (cmd == SOCK_DESTROY && handler->destroy)
} else if (cmd == SOCK_DIAG_BY_FAMILY) {
struct inet_diag_dump_data empty_dump_data = {};
struct netlink_callback cb = {
.nlh = nlh,
.skb = in_skb,
.data = &empty_dump_data,
};
err = handler->dump_one(&cb, req);
} else if (cmd == SOCK_DESTROY && handler->destroy) {
err = handler->destroy(in_skb, req);
else
} else {
err = -EOPNOTSUPP;
}
inet_diag_unlock_handler(handler);
return err;
@ -847,23 +884,6 @@ static int inet_diag_bc_audit(const struct nlattr *attr,
return len == 0 ? 0 : -EINVAL;
}
static int inet_csk_diag_dump(struct sock *sk,
struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
const struct nlattr *bc,
bool net_admin)
{
if (!inet_diag_bc_sk(bc, sk))
return 0;
return inet_csk_diag_fill(sk, skb, r,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
net_admin);
}
static void twsk_build_assert(void)
{
BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
@ -892,14 +912,17 @@ static void twsk_build_assert(void)
void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct inet_diag_dump_data *cb_data = cb->data;
struct net *net = sock_net(skb->sk);
u32 idiag_states = r->idiag_states;
int i, num, s_i, s_num;
struct nlattr *bc;
struct sock *sk;
bc = cb_data->inet_diag_nla_bc;
if (idiag_states & TCPF_SYN_RECV)
idiag_states |= TCPF_NEW_SYN_RECV;
s_i = cb->args[1];
@ -935,8 +958,12 @@ void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
r->id.idiag_sport)
goto next_listen;
if (inet_csk_diag_dump(sk, skb, cb, r,
bc, net_admin) < 0) {
if (!inet_diag_bc_sk(bc, sk))
goto next_listen;
if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
cb, r, NLM_F_MULTI,
net_admin) < 0) {
spin_unlock(&ilb->lock);
goto done;
}
@ -1014,11 +1041,8 @@ next_normal:
res = 0;
for (idx = 0; idx < accum; idx++) {
if (res >= 0) {
res = sk_diag_fill(sk_arr[idx], skb, r,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
cb->nlh, net_admin);
res = sk_diag_fill(sk_arr[idx], skb, cb, r,
NLM_F_MULTI, net_admin);
if (res < 0)
num = num_arr[idx];
}
@ -1042,31 +1066,101 @@ out:
EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
const struct inet_diag_handler *handler;
u32 prev_min_dump_alloc;
int err = 0;
again:
prev_min_dump_alloc = cb->min_dump_alloc;
handler = inet_diag_lock_handler(r->sdiag_protocol);
if (!IS_ERR(handler))
handler->dump(skb, cb, r, bc);
handler->dump(skb, cb, r);
else
err = PTR_ERR(handler);
inet_diag_unlock_handler(handler);
/* The skb is not large enough to fit one sk info and
* inet_sk_diag_fill() has requested for a larger skb.
*/
if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
if (!err)
goto again;
}
return err ? : skb->len;
}
static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int hdrlen = sizeof(struct inet_diag_req_v2);
struct nlattr *bc = NULL;
return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
}
if (nlmsg_attrlen(cb->nlh, hdrlen))
bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
{
const struct nlmsghdr *nlh = cb->nlh;
struct inet_diag_dump_data *cb_data;
struct sk_buff *skb = cb->skb;
struct nlattr *nla;
int rem, err;
return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
if (!cb_data)
return -ENOMEM;
nla_for_each_attr(nla, nlmsg_attrdata(nlh, hdrlen),
nlmsg_attrlen(nlh, hdrlen), rem) {
int type = nla_type(nla);
if (type < __INET_DIAG_REQ_MAX)
cb_data->req_nlas[type] = nla;
}
nla = cb_data->inet_diag_nla_bc;
if (nla) {
err = inet_diag_bc_audit(nla, skb);
if (err) {
kfree(cb_data);
return err;
}
}
nla = cb_data->inet_diag_nla_bpf_stgs;
if (nla) {
struct bpf_sk_storage_diag *bpf_stg_diag;
bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
if (IS_ERR(bpf_stg_diag)) {
kfree(cb_data);
return PTR_ERR(bpf_stg_diag);
}
cb_data->bpf_stg_diag = bpf_stg_diag;
}
cb->data = cb_data;
return 0;
}
static int inet_diag_dump_start(struct netlink_callback *cb)
{
return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
}
static int inet_diag_dump_start_compat(struct netlink_callback *cb)
{
return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
}
static int inet_diag_dump_done(struct netlink_callback *cb)
{
struct inet_diag_dump_data *cb_data = cb->data;
bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
kfree(cb->data);
return 0;
}
static int inet_diag_type2proto(int type)
@ -1085,9 +1179,7 @@ static int inet_diag_dump_compat(struct sk_buff *skb,
struct netlink_callback *cb)
{
struct inet_diag_req *rc = nlmsg_data(cb->nlh);
int hdrlen = sizeof(struct inet_diag_req);
struct inet_diag_req_v2 req;
struct nlattr *bc = NULL;
req.sdiag_family = AF_UNSPEC; /* compatibility */
req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
@ -1095,10 +1187,7 @@ static int inet_diag_dump_compat(struct sk_buff *skb,
req.idiag_states = rc->idiag_states;
req.id = rc->id;
if (nlmsg_attrlen(cb->nlh, hdrlen))
bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
return __inet_diag_dump(skb, cb, &req, bc);
return __inet_diag_dump(skb, cb, &req);
}
static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
@ -1126,22 +1215,12 @@ static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
return -EINVAL;
if (nlh->nlmsg_flags & NLM_F_DUMP) {
if (nlmsg_attrlen(nlh, hdrlen)) {
struct nlattr *attr;
int err;
attr = nlmsg_find_attr(nlh, hdrlen,
INET_DIAG_REQ_BYTECODE);
err = inet_diag_bc_audit(attr, skb);
if (err)
return err;
}
{
struct netlink_dump_control c = {
.dump = inet_diag_dump_compat,
};
return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
}
struct netlink_dump_control c = {
.start = inet_diag_dump_start_compat,
.done = inet_diag_dump_done,
.dump = inet_diag_dump_compat,
};
return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
}
return inet_diag_get_exact_compat(skb, nlh);
@ -1157,22 +1236,12 @@ static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
h->nlmsg_flags & NLM_F_DUMP) {
if (nlmsg_attrlen(h, hdrlen)) {
struct nlattr *attr;
int err;
attr = nlmsg_find_attr(h, hdrlen,
INET_DIAG_REQ_BYTECODE);
err = inet_diag_bc_audit(attr, skb);
if (err)
return err;
}
{
struct netlink_dump_control c = {
.dump = inet_diag_dump,
};
return netlink_dump_start(net->diag_nlsk, skb, h, &c);
}
struct netlink_dump_control c = {
.start = inet_diag_dump_start,
.done = inet_diag_dump_done,
.dump = inet_diag_dump,
};
return netlink_dump_start(net->diag_nlsk, skb, h, &c);
}
return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));

24
net/ipv4/raw_diag.c
View File

@ -87,15 +87,16 @@ out_unlock:
return sk ? sk : ERR_PTR(-ENOENT);
}
static int raw_diag_dump_one(struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
static int raw_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *r)
{
struct net *net = sock_net(in_skb->sk);
struct sk_buff *in_skb = cb->skb;
struct sk_buff *rep;
struct sock *sk;
struct net *net;
int err;
net = sock_net(in_skb->sk);
sk = raw_sock_get(net, r);
if (IS_ERR(sk))
return PTR_ERR(sk);
@ -108,10 +109,7 @@ static int raw_diag_dump_one(struct sk_buff *in_skb,
return -ENOMEM;
}
err = inet_sk_diag_fill(sk, NULL, rep, r,
sk_user_ns(NETLINK_CB(in_skb).sk),
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0, nlh,
err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0,
netlink_net_capable(in_skb, CAP_NET_ADMIN));
sock_put(sk);
@ -136,25 +134,25 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
if (!inet_diag_bc_sk(bc, sk))
return 0;
return inet_sk_diag_fill(sk, NULL, skb, r,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI,
cb->nlh, net_admin);
return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin);
}
static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct raw_hashinfo *hashinfo = raw_get_hashinfo(r);
struct net *net = sock_net(skb->sk);
struct inet_diag_dump_data *cb_data;
int num, s_num, slot, s_slot;
struct sock *sk = NULL;
struct nlattr *bc;
if (IS_ERR(hashinfo))
return;
cb_data = cb->data;
bc = cb_data->inet_diag_nla_bc;
s_slot = cb->args[0];
num = s_num = cb->args[1];

8
net/ipv4/tcp_diag.c
View File

@ -179,15 +179,15 @@ static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
}
static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r);
}
static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
static int tcp_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
return inet_diag_dump_one_icsk(&tcp_hashinfo, cb, req);
}
#ifdef CONFIG_INET_DIAG_DESTROY

41
net/ipv4/udp_diag.c
View File

@ -21,16 +21,15 @@ static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
if (!inet_diag_bc_sk(bc, sk))
return 0;
return inet_sk_diag_fill(sk, NULL, skb, req,
sk_user_ns(NETLINK_CB(cb->skb).sk),
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
return inet_sk_diag_fill(sk, NULL, skb, cb, req, NLM_F_MULTI,
net_admin);
}
static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
static int udp_dump_one(struct udp_table *tbl,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
struct sk_buff *in_skb = cb->skb;
int err = -EINVAL;
struct sock *sk = NULL;
struct sk_buff *rep;
@ -70,11 +69,8 @@ static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
if (!rep)
goto out;
err = inet_sk_diag_fill(sk, NULL, rep, req,
sk_user_ns(NETLINK_CB(in_skb).sk),
NETLINK_CB(in_skb).portid,
nlh->nlmsg_seq, 0, nlh,
netlink_net_capable(in_skb, CAP_NET_ADMIN));
err = inet_sk_diag_fill(sk, NULL, rep, cb, req, 0,
netlink_net_capable(in_skb, CAP_NET_ADMIN));
if (err < 0) {
WARN_ON(err == -EMSGSIZE);
kfree_skb(rep);
@ -93,12 +89,16 @@ out_nosk:
static void udp_dump(struct udp_table *table, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
struct net *net = sock_net(skb->sk);
struct inet_diag_dump_data *cb_data;
int num, s_num, slot, s_slot;
struct nlattr *bc;
cb_data = cb->data;
bc = cb_data->inet_diag_nla_bc;
s_slot = cb->args[0];
num = s_num = cb->args[1];
@ -146,15 +146,15 @@ done:
}
static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
udp_dump(&udp_table, skb, cb, r, bc);
udp_dump(&udp_table, skb, cb, r);
}
static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
static int udp_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
return udp_dump_one(&udp_table, in_skb, nlh, req);
return udp_dump_one(&udp_table, cb, req);
}
static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
@ -249,16 +249,15 @@ static const struct inet_diag_handler udp_diag_handler = {
};
static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
udp_dump(&udplite_table, skb, cb, r, bc);
udp_dump(&udplite_table, skb, cb, r);
}
static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
static int udplite_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
return udp_dump_one(&udplite_table, in_skb, nlh, req);
return udp_dump_one(&udplite_table, cb, req);
}
static const struct inet_diag_handler udplite_diag_handler = {

4
net/kcm/kcmsock.c
View File

@ -380,9 +380,7 @@ static int kcm_parse_func_strparser(struct strparser *strp, struct sk_buff *skb)
struct bpf_prog *prog = psock->bpf_prog;
int res;
preempt_disable();
res = BPF_PROG_RUN(prog, skb);
preempt_enable();
res = bpf_prog_run_pin_on_cpu(prog, skb);
return res;
}

7
net/sctp/diag.c
View File

@ -432,11 +432,12 @@ static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
}
static int sctp_diag_dump_one(struct sk_buff *in_skb,
const struct nlmsghdr *nlh,
static int sctp_diag_dump_one(struct netlink_callback *cb,
const struct inet_diag_req_v2 *req)
{
struct sk_buff *in_skb = cb->skb;
struct net *net = sock_net(in_skb->sk);
const struct nlmsghdr *nlh = cb->nlh;
union sctp_addr laddr, paddr;
struct sctp_comm_param commp = {
.skb = in_skb,
@ -470,7 +471,7 @@ static int sctp_diag_dump_one(struct sk_buff *in_skb,
}
static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
const struct inet_diag_req_v2 *r)
{
u32 idiag_states = r->idiag_states;
struct net *net = sock_net(skb->sk);

2
scripts/bpf_helpers_doc.py
View File

@ -1,4 +1,4 @@
#!/usr/bin/python3
#!/usr/bin/env python3
# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2018-2019 Netronome Systems, Inc.

19
tools/bpf/bpftool/Documentation/bpftool-feature.rst
View File

@ -19,19 +19,24 @@ SYNOPSIS
FEATURE COMMANDS
================
| **bpftool** **feature probe** [*COMPONENT*] [**macros** [**prefix** *PREFIX*]]
| **bpftool** **feature probe** [*COMPONENT*] [**full**] [**macros** [**prefix** *PREFIX*]]
| **bpftool** **feature help**
|
| *COMPONENT* := { **kernel** | **dev** *NAME* }
DESCRIPTION
===========
**bpftool feature probe** [**kernel**] [**macros** [**prefix** *PREFIX*]]
**bpftool feature probe** [**kernel**] [**full**] [**macros** [**prefix** *PREFIX*]]
Probe the running kernel and dump a number of eBPF-related
parameters, such as availability of the **bpf()** system call,
JIT status, eBPF program types availability, eBPF helper
functions availability, and more.
By default, bpftool **does not run probes** for
**bpf_probe_write_user**\ () and **bpf_trace_printk**\()
helpers which print warnings to kernel logs. To enable them
and run all probes, the **full** keyword should be used.
If the **macros** keyword (but not the **-j** option) is
passed, a subset of the output is dumped as a list of
**#define** macros that are ready to be included in a C
@ -44,16 +49,12 @@ DESCRIPTION
Keyword **kernel** can be omitted. If no probe target is
specified, probing the kernel is the default behaviour.
Note that when probed, some eBPF helpers (e.g.
**bpf_trace_printk**\ () or **bpf_probe_write_user**\ ()) may
print warnings to kernel logs.
**bpftool feature probe dev** *NAME* [**macros** [**prefix** *PREFIX*]]
**bpftool feature probe dev** *NAME* [**full**] [**macros** [**prefix** *PREFIX*]]
Probe network device for supported eBPF features and dump
results to the console.
The two keywords **macros** and **prefix** have the same
role as when probing the kernel.
The keywords **full**, **macros** and **prefix** have the
same role as when probing the kernel.
**bpftool feature help**
Print short help message.

3
tools/bpf/bpftool/Documentation/bpftool-prog.rst
View File

@ -42,7 +42,8 @@ PROG COMMANDS
| **cgroup/bind4** | **cgroup/bind6** | **cgroup/post_bind4** | **cgroup/post_bind6** |
| **cgroup/connect4** | **cgroup/connect6** | **cgroup/sendmsg4** | **cgroup/sendmsg6** |
| **cgroup/recvmsg4** | **cgroup/recvmsg6** | **cgroup/sysctl** |
| **cgroup/getsockopt** | **cgroup/setsockopt**
| **cgroup/getsockopt** | **cgroup/setsockopt** |
| **struct_ops** | **fentry** | **fexit** | **freplace**
| }
| *ATTACH_TYPE* := {
| **msg_verdict** | **stream_verdict** | **stream_parser** | **flow_dissector**

6
tools/bpf/bpftool/bash-completion/bpftool
View File

@ -469,7 +469,8 @@ _bpftool()
cgroup/recvmsg4 cgroup/recvmsg6 \
cgroup/post_bind4 cgroup/post_bind6 \
cgroup/sysctl cgroup/getsockopt \
cgroup/setsockopt" -- \
cgroup/setsockopt struct_ops \
fentry fexit freplace" -- \
"$cur" ) )
return 0
;;
@ -983,11 +984,12 @@ _bpftool()
probe)
[[ $prev == "prefix" ]] && return 0
if _bpftool_search_list 'macros'; then
COMPREPLY+=( $( compgen -W 'prefix' -- "$cur" ) )
_bpftool_once_attr 'prefix'
else
COMPREPLY+=( $( compgen -W 'macros' -- "$cur" ) )
fi
_bpftool_one_of_list 'kernel dev'
_bpftool_once_attr 'full'
return 0
;;
*)

283
tools/bpf/bpftool/feature.c
View File

@ -112,18 +112,12 @@ print_start_section(const char *json_title, const char *plain_title,
}
}
static void
print_end_then_start_section(const char *json_title, const char *plain_title,
const char *define_comment,
const char *define_prefix)
static void print_end_section(void)
{
if (json_output)
jsonw_end_object(json_wtr);
else
printf("\n");
print_start_section(json_title, plain_title, define_comment,
define_prefix);
}
/* Probing functions */
@ -519,14 +513,39 @@ probe_map_type(enum bpf_map_type map_type, const char *define_prefix,
define_prefix);
}
static void
probe_helper_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
const char *define_prefix, unsigned int id,
const char *ptype_name, __u32 ifindex)
{
bool res;
if (!supported_type)
res = false;
else
res = bpf_probe_helper(id, prog_type, ifindex);
if (json_output) {
if (res)
jsonw_string(json_wtr, helper_name[id]);
} else if (define_prefix) {
printf("#define %sBPF__PROG_TYPE_%s__HELPER_%s %s\n",
define_prefix, ptype_name, helper_name[id],
res ? "1" : "0");
} else {
if (res)
printf("\n\t- %s", helper_name[id]);
}
}
static void
probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
const char *define_prefix, __u32 ifindex)
const char *define_prefix, bool full_mode,
__u32 ifindex)
{
const char *ptype_name = prog_type_name[prog_type];
char feat_name[128];
unsigned int id;
bool res;
if (ifindex)
/* Only test helpers for offload-able program types */
@ -548,21 +567,19 @@ probe_helpers_for_progtype(enum bpf_prog_type prog_type, bool supported_type,
}
for (id = 1; id < ARRAY_SIZE(helper_name); id++) {
if (!supported_type)
res = false;
else
res = bpf_probe_helper(id, prog_type, ifindex);
if (json_output) {
if (res)
jsonw_string(json_wtr, helper_name[id]);
} else if (define_prefix) {
printf("#define %sBPF__PROG_TYPE_%s__HELPER_%s %s\n",
define_prefix, ptype_name, helper_name[id],
res ? "1" : "0");
} else {
if (res)
printf("\n\t- %s", helper_name[id]);
/* Skip helper functions which emit dmesg messages when not in
* the full mode.
*/
switch (id) {
case BPF_FUNC_trace_printk:
case BPF_FUNC_probe_write_user:
if (!full_mode)
continue;
/* fallthrough */
default:
probe_helper_for_progtype(prog_type, supported_type,
define_prefix, id, ptype_name,
ifindex);
}
}
@ -584,13 +601,132 @@ probe_large_insn_limit(const char *define_prefix, __u32 ifindex)
res, define_prefix);
}
static void
section_system_config(enum probe_component target, const char *define_prefix)
{
switch (target) {
case COMPONENT_KERNEL:
case COMPONENT_UNSPEC:
if (define_prefix)
break;
print_start_section("system_config",
"Scanning system configuration...",
NULL, /* define_comment never used here */
NULL); /* define_prefix always NULL here */
if (check_procfs()) {
probe_unprivileged_disabled();
probe_jit_enable();
probe_jit_harden();
probe_jit_kallsyms();
probe_jit_limit();
} else {
p_info("/* procfs not mounted, skipping related probes */");
}
probe_kernel_image_config();
print_end_section();
break;
default:
break;
}
}
static bool section_syscall_config(const char *define_prefix)
{
bool res;
print_start_section("syscall_config",
"Scanning system call availability...",
"/*** System call availability ***/",
define_prefix);
res = probe_bpf_syscall(define_prefix);
print_end_section();
return res;
}
static void
section_program_types(bool *supported_types, const char *define_prefix,
__u32 ifindex)
{
unsigned int i;
print_start_section("program_types",
"Scanning eBPF program types...",
"/*** eBPF program types ***/",
define_prefix);
for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++)
probe_prog_type(i, supported_types, define_prefix, ifindex);
print_end_section();
}
static void section_map_types(const char *define_prefix, __u32 ifindex)
{
unsigned int i;
print_start_section("map_types",
"Scanning eBPF map types...",
"/*** eBPF map types ***/",
define_prefix);
for (i = BPF_MAP_TYPE_UNSPEC + 1; i < map_type_name_size; i++)
probe_map_type(i, define_prefix, ifindex);
print_end_section();
}
static void
section_helpers(bool *supported_types, const char *define_prefix,
bool full_mode, __u32 ifindex)
{
unsigned int i;
print_start_section("helpers",
"Scanning eBPF helper functions...",
"/*** eBPF helper functions ***/",
define_prefix);
if (define_prefix)
printf("/*\n"
" * Use %sHAVE_PROG_TYPE_HELPER(prog_type_name, helper_name)\n"
" * to determine if <helper_name> is available for <prog_type_name>,\n"
" * e.g.\n"
" * #if %sHAVE_PROG_TYPE_HELPER(xdp, bpf_redirect)\n"
" * // do stuff with this helper\n"
" * #elif\n"
" * // use a workaround\n"
" * #endif\n"
" */\n"
"#define %sHAVE_PROG_TYPE_HELPER(prog_type, helper) \\\n"
" %sBPF__PROG_TYPE_ ## prog_type ## __HELPER_ ## helper\n",
define_prefix, define_prefix, define_prefix,
define_prefix);
for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++)
probe_helpers_for_progtype(i, supported_types[i],
define_prefix, full_mode, ifindex);
print_end_section();
}
static void section_misc(const char *define_prefix, __u32 ifindex)
{
print_start_section("misc",
"Scanning miscellaneous eBPF features...",
"/*** eBPF misc features ***/",
define_prefix);
probe_large_insn_limit(define_prefix, ifindex);
print_end_section();
}
static int do_probe(int argc, char **argv)
{
enum probe_component target = COMPONENT_UNSPEC;
const char *define_prefix = NULL;
bool supported_types[128] = {};
bool full_mode = false;
__u32 ifindex = 0;
unsigned int i;
char *ifname;
/* Detection assumes user has sufficient privileges (CAP_SYS_ADMIN).
@ -629,6 +765,9 @@ static int do_probe(int argc, char **argv)
strerror(errno));
return -1;
}
} else if (is_prefix(*argv, "full")) {
full_mode = true;
NEXT_ARG();
} else if (is_prefix(*argv, "macros") && !define_prefix) {
define_prefix = "";
NEXT_ARG();
@ -658,97 +797,19 @@ static int do_probe(int argc, char **argv)
jsonw_start_object(json_wtr);
}
switch (target) {
case COMPONENT_KERNEL:
case COMPONENT_UNSPEC:
if (define_prefix)
break;
print_start_section("system_config",
"Scanning system configuration...",
NULL, /* define_comment never used here */
NULL); /* define_prefix always NULL here */
if (check_procfs()) {
probe_unprivileged_disabled();
probe_jit_enable();
probe_jit_harden();
probe_jit_kallsyms();
probe_jit_limit();
} else {
p_info("/* procfs not mounted, skipping related probes */");
}
probe_kernel_image_config();
if (json_output)
jsonw_end_object(json_wtr);
else
printf("\n");
break;
default:
break;
}
print_start_section("syscall_config",
"Scanning system call availability...",
"/*** System call availability ***/",
define_prefix);
if (!probe_bpf_syscall(define_prefix))
section_system_config(target, define_prefix);
if (!section_syscall_config(define_prefix))
/* bpf() syscall unavailable, don't probe other BPF features */
goto exit_close_json;
print_end_then_start_section("program_types",
"Scanning eBPF program types...",
"/*** eBPF program types ***/",
define_prefix);
for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++)
probe_prog_type(i, supported_types, define_prefix, ifindex);
print_end_then_start_section("map_types",
"Scanning eBPF map types...",
"/*** eBPF map types ***/",
define_prefix);
for (i = BPF_MAP_TYPE_UNSPEC + 1; i < map_type_name_size; i++)
probe_map_type(i, define_prefix, ifindex);
print_end_then_start_section("helpers",
"Scanning eBPF helper functions...",
"/*** eBPF helper functions ***/",
define_prefix);
if (define_prefix)
printf("/*\n"
" * Use %sHAVE_PROG_TYPE_HELPER(prog_type_name, helper_name)\n"
" * to determine if <helper_name> is available for <prog_type_name>,\n"
" * e.g.\n"
" * #if %sHAVE_PROG_TYPE_HELPER(xdp, bpf_redirect)\n"
" * // do stuff with this helper\n"
" * #elif\n"
" * // use a workaround\n"
" * #endif\n"
" */\n"
"#define %sHAVE_PROG_TYPE_HELPER(prog_type, helper) \\\n"
" %sBPF__PROG_TYPE_ ## prog_type ## __HELPER_ ## helper\n",
define_prefix, define_prefix, define_prefix,
define_prefix);
for (i = BPF_PROG_TYPE_UNSPEC + 1; i < ARRAY_SIZE(prog_type_name); i++)
probe_helpers_for_progtype(i, supported_types[i],
define_prefix, ifindex);
print_end_then_start_section("misc",
"Scanning miscellaneous eBPF features...",
"/*** eBPF misc features ***/",
define_prefix);
probe_large_insn_limit(define_prefix, ifindex);
section_program_types(supported_types, define_prefix, ifindex);
section_map_types(define_prefix, ifindex);
section_helpers(supported_types, define_prefix, full_mode, ifindex);
section_misc(define_prefix, ifindex);
exit_close_json:
if (json_output) {
/* End current "section" of probes */
jsonw_end_object(json_wtr);
if (json_output)
/* End root object */
jsonw_end_object(json_wtr);
}
return 0;
}
@ -761,7 +822,7 @@ static int do_help(int argc, char **argv)
}
fprintf(stderr,
"Usage: %s %s probe [COMPONENT] [macros [prefix PREFIX]]\n"
"Usage: %s %s probe [COMPONENT] [full] [macros [prefix PREFIX]]\n"
" %s %s help\n"
"\n"
" COMPONENT := { kernel | dev NAME }\n"

3
tools/bpf/bpftool/main.h
View File

@ -76,6 +76,9 @@ static const char * const prog_type_name[] = {
[BPF_PROG_TYPE_CGROUP_SYSCTL] = "cgroup_sysctl",
[BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE] = "raw_tracepoint_writable",
[BPF_PROG_TYPE_CGROUP_SOCKOPT] = "cgroup_sockopt",
[BPF_PROG_TYPE_TRACING] = "tracing",
[BPF_PROG_TYPE_STRUCT_OPS] = "struct_ops",
[BPF_PROG_TYPE_EXT] = "ext",
};
extern const char * const map_type_name[];

4
tools/bpf/bpftool/prog.c
View File

@ -1573,8 +1573,8 @@ static int do_help(int argc, char **argv)
" cgroup/bind4 | cgroup/bind6 | cgroup/post_bind4 |\n"
" cgroup/post_bind6 | cgroup/connect4 | cgroup/connect6 |\n"
" cgroup/sendmsg4 | cgroup/sendmsg6 | cgroup/recvmsg4 |\n"
" cgroup/recvmsg6 | cgroup/getsockopt |\n"
" cgroup/setsockopt }\n"
" cgroup/recvmsg6 | cgroup/getsockopt | cgroup/setsockopt |\n"
" struct_ops | fentry | fexit | freplace }\n"
" ATTACH_TYPE := { msg_verdict | stream_verdict | stream_parser |\n"
" flow_dissector }\n"
" " HELP_SPEC_OPTIONS "\n"

5
tools/testing/selftests/.gitignore vendored
View File

@ -3,4 +3,7 @@ gpiogpio-hammer
gpioinclude/
gpiolsgpio
tpm2/SpaceTest.log
tpm2/*.pyc
# Python bytecode and cache
__pycache__/
*.py[cod]

5
tools/testing/selftests/bpf/Makefile
View File

@ -20,7 +20,7 @@ CLANG ?= clang
LLC ?= llc
LLVM_OBJCOPY ?= llvm-objcopy
BPF_GCC ?= $(shell command -v bpf-gcc;)
CFLAGS += -g -Wall -O2 $(GENFLAGS) -I$(CURDIR) -I$(APIDIR) \
CFLAGS += -g -rdynamic -Wall -O2 $(GENFLAGS) -I$(CURDIR) -I$(APIDIR) \
-I$(INCLUDE_DIR) -I$(GENDIR) -I$(LIBDIR) -I$(TOOLSINCDIR) \
-Dbpf_prog_load=bpf_prog_test_load \
-Dbpf_load_program=bpf_test_load_program
@ -62,7 +62,8 @@ TEST_PROGS := test_kmod.sh \
test_tc_tunnel.sh \
test_tc_edt.sh \
test_xdping.sh \
test_bpftool_build.sh
test_bpftool_build.sh \
test_bpftool.sh
TEST_PROGS_EXTENDED := with_addr.sh \
with_tunnels.sh \

30
tools/testing/selftests/bpf/prog_tests/select_reuseport.c
View File

@ -509,11 +509,6 @@ static void test_syncookie(int type, sa_family_t family)
.pass_on_failure = 0,
};
if (type != SOCK_STREAM) {
test__skip();
return;
}
/*
* +1 for TCP-SYN and
* +1 for the TCP-ACK (ack the syncookie)
@ -787,7 +782,7 @@ static const char *sotype_str(int sotype)
}
}
#define TEST_INIT(fn, ...) { fn, #fn, __VA_ARGS__ }
#define TEST_INIT(fn_, ...) { .fn = fn_, .name = #fn_, __VA_ARGS__ }
static void test_config(int sotype, sa_family_t family, bool inany)
{
@ -795,19 +790,31 @@ static void test_config(int sotype, sa_family_t family, bool inany)
void (*fn)(int sotype, sa_family_t family);
const char *name;
bool no_inner_map;
int need_sotype;
} tests[] = {
TEST_INIT(test_err_inner_map, true /* no_inner_map */),
TEST_INIT(test_err_inner_map,
.no_inner_map = true),
TEST_INIT(test_err_skb_data),
TEST_INIT(test_err_sk_select_port),
TEST_INIT(test_pass),
TEST_INIT(test_syncookie),
TEST_INIT(test_syncookie,
.need_sotype = SOCK_STREAM),
TEST_INIT(test_pass_on_err),
TEST_INIT(test_detach_bpf),
};
char s[MAX_TEST_NAME];
const struct test *t;
/* SOCKMAP/SOCKHASH don't support UDP yet */
if (sotype == SOCK_DGRAM &&
(inner_map_type == BPF_MAP_TYPE_SOCKMAP ||
inner_map_type == BPF_MAP_TYPE_SOCKHASH))
return;
for (t = tests; t < tests + ARRAY_SIZE(tests); t++) {
if (t->need_sotype && t->need_sotype != sotype)
continue; /* test not compatible with socket type */
snprintf(s, sizeof(s), "%s %s/%s %s %s",
maptype_str(inner_map_type),
family_str(family), sotype_str(sotype),
@ -816,13 +823,6 @@ static void test_config(int sotype, sa_family_t family, bool inany)
if (!test__start_subtest(s))
continue;
if (sotype == SOCK_DGRAM &&
inner_map_type != BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) {
/* SOCKMAP/SOCKHASH don't support UDP yet */
test__skip();
continue;
}
setup_per_test(sotype, family, inany, t->no_inner_map);
t->fn(sotype, family);
cleanup_per_test(t->no_inner_map);

178
tools/testing/selftests/bpf/test_bpftool.py Normal file
View File

@ -0,0 +1,178 @@
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020 SUSE LLC.
import collections
import functools
import json
import os
import socket
import subprocess
import unittest
# Add the source tree of bpftool and /usr/local/sbin to PATH
cur_dir = os.path.dirname(os.path.realpath(__file__))
bpftool_dir = os.path.abspath(os.path.join(cur_dir, "..", "..", "..", "..",
"tools", "bpf", "bpftool"))
os.environ["PATH"] = bpftool_dir + ":/usr/local/sbin:" + os.environ["PATH"]
class IfaceNotFoundError(Exception):
pass
class UnprivilegedUserError(Exception):
pass
def _bpftool(args, json=True):
_args = ["bpftool"]
if json:
_args.append("-j")
_args.extend(args)
return subprocess.check_output(_args)
def bpftool(args):
return _bpftool(args, json=False).decode("utf-8")
def bpftool_json(args):
res = _bpftool(args)
return json.loads(res)
def get_default_iface():
for iface in socket.if_nameindex():
if iface[1] != "lo":
return iface[1]
raise IfaceNotFoundError("Could not find any network interface to probe")
def default_iface(f):
@functools.wraps(f)
def wrapper(*args, **kwargs):
iface = get_default_iface()
return f(*args, iface, **kwargs)
return wrapper
class TestBpftool(unittest.TestCase):
@classmethod
def setUpClass(cls):
if os.getuid() != 0:
raise UnprivilegedUserError(
"This test suite needs root privileges")
@default_iface
def test_feature_dev_json(self, iface):
unexpected_helpers = [
"bpf_probe_write_user",
"bpf_trace_printk",
]
expected_keys = [
"syscall_config",
"program_types",
"map_types",
"helpers",
"misc",
]
res = bpftool_json(["feature", "probe", "dev", iface])
# Check if the result has all expected keys.
self.assertCountEqual(res.keys(), expected_keys)
# Check if unexpected helpers are not included in helpers probes
# result.
for helpers in res["helpers"].values():
for unexpected_helper in unexpected_helpers:
self.assertNotIn(unexpected_helper, helpers)
def test_feature_kernel(self):
test_cases = [
bpftool_json(["feature", "probe", "kernel"]),
bpftool_json(["feature", "probe"]),
bpftool_json(["feature"]),
]
unexpected_helpers = [
"bpf_probe_write_user",
"bpf_trace_printk",
]
expected_keys = [
"syscall_config",
"system_config",
"program_types",
"map_types",
"helpers",
"misc",
]
for tc in test_cases:
# Check if the result has all expected keys.
self.assertCountEqual(tc.keys(), expected_keys)
# Check if unexpected helpers are not included in helpers probes
# result.
for helpers in tc["helpers"].values():
for unexpected_helper in unexpected_helpers:
self.assertNotIn(unexpected_helper, helpers)
def test_feature_kernel_full(self):
test_cases = [
bpftool_json(["feature", "probe", "kernel", "full"]),
bpftool_json(["feature", "probe", "full"]),
]
expected_helpers = [
"bpf_probe_write_user",
"bpf_trace_printk",
]
for tc in test_cases:
# Check if expected helpers are included at least once in any
# helpers list for any program type. Unfortunately we cannot assume
# that they will be included in all program types or a specific
# subset of programs. It depends on the kernel version and
# configuration.
found_helpers = False
for helpers in tc["helpers"].values():
if all(expected_helper in helpers
for expected_helper in expected_helpers):
found_helpers = True
break
self.assertTrue(found_helpers)
def test_feature_kernel_full_vs_not_full(self):
full_res = bpftool_json(["feature", "probe", "full"])
not_full_res = bpftool_json(["feature", "probe"])
not_full_set = set()
full_set = set()
for helpers in full_res["helpers"].values():
for helper in helpers:
full_set.add(helper)
for helpers in not_full_res["helpers"].values():
for helper in helpers:
not_full_set.add(helper)
self.assertCountEqual(full_set - not_full_set,
{"bpf_probe_write_user", "bpf_trace_printk"})
self.assertCountEqual(not_full_set - full_set, set())
def test_feature_macros(self):
expected_patterns = [
r"/\*\*\* System call availability \*\*\*/",
r"#define HAVE_BPF_SYSCALL",
r"/\*\*\* eBPF program types \*\*\*/",
r"#define HAVE.*PROG_TYPE",
r"/\*\*\* eBPF map types \*\*\*/",
r"#define HAVE.*MAP_TYPE",
r"/\*\*\* eBPF helper functions \*\*\*/",
r"#define HAVE.*HELPER",
r"/\*\*\* eBPF misc features \*\*\*/",
]
res = bpftool(["feature", "probe", "macros"])
for pattern in expected_patterns:
self.assertRegex(res, pattern)

5
tools/testing/selftests/bpf/test_bpftool.sh Executable file
View File

@ -0,0 +1,5 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2020 SUSE LLC.
python3 -m unittest -v test_bpftool.TestBpftool

25
tools/testing/selftests/bpf/test_progs.c
View File

@ -6,6 +6,8 @@
#include "bpf_rlimit.h"
#include <argp.h>
#include <string.h>
#include <signal.h>
#include <execinfo.h> /* backtrace */
/* defined in test_progs.h */
struct test_env env = {};
@ -617,6 +619,23 @@ int cd_flavor_subdir(const char *exec_name)
return chdir(flavor);
}
#define MAX_BACKTRACE_SZ 128
void crash_handler(int signum)
{
void *bt[MAX_BACKTRACE_SZ];
size_t sz;
sz = backtrace(bt, ARRAY_SIZE(bt));
if (env.test)
dump_test_log(env.test, true);
if (env.stdout)
stdio_restore();
fprintf(stderr, "Caught signal #%d!\nStack trace:\n", signum);
backtrace_symbols_fd(bt, sz, STDERR_FILENO);
}
int main(int argc, char **argv)
{
static const struct argp argp = {
@ -624,8 +643,14 @@ int main(int argc, char **argv)
.parser = parse_arg,
.doc = argp_program_doc,
};
struct sigaction sigact = {
.sa_handler = crash_handler,
.sa_flags = SA_RESETHAND,
};
int err, i;
sigaction(SIGSEGV, &sigact, NULL);
err = argp_parse(&argp, argc, argv, 0, NULL, &env);
if (err)
return err;