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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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c0e19f2c9a
Previous patch adds 1:1 mapping between all 211 LSM hooks
and bpf_cgroup program array. Instead of reserving a slot per
possible hook, reserve 10 slots per cgroup for lsm programs.
Those slots are dynamically allocated on demand and reclaimed.
struct cgroup_bpf {
struct bpf_prog_array * effective[33]; /* 0 264 */
/* --- cacheline 4 boundary (256 bytes) was 8 bytes ago --- */
struct hlist_head progs[33]; /* 264 264 */
/* --- cacheline 8 boundary (512 bytes) was 16 bytes ago --- */
u8 flags[33]; /* 528 33 */
/* XXX 7 bytes hole, try to pack */
struct list_head storages; /* 568 16 */
/* --- cacheline 9 boundary (576 bytes) was 8 bytes ago --- */
struct bpf_prog_array * inactive; /* 584 8 */
struct percpu_ref refcnt; /* 592 16 */
struct work_struct release_work; /* 608 72 */
/* size: 680, cachelines: 11, members: 7 */
/* sum members: 673, holes: 1, sum holes: 7 */
/* last cacheline: 40 bytes */
};
Reviewed-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220628174314.1216643-5-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
79 lines
2 KiB
C
79 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _BPF_CGROUP_DEFS_H
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#define _BPF_CGROUP_DEFS_H
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#ifdef CONFIG_CGROUP_BPF
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#include <linux/list.h>
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#include <linux/percpu-refcount.h>
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#include <linux/workqueue.h>
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struct bpf_prog_array;
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#ifdef CONFIG_BPF_LSM
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/* Maximum number of concurrently attachable per-cgroup LSM hooks. */
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#define CGROUP_LSM_NUM 10
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#else
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#define CGROUP_LSM_NUM 0
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#endif
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enum cgroup_bpf_attach_type {
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CGROUP_BPF_ATTACH_TYPE_INVALID = -1,
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CGROUP_INET_INGRESS = 0,
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CGROUP_INET_EGRESS,
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CGROUP_INET_SOCK_CREATE,
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CGROUP_SOCK_OPS,
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CGROUP_DEVICE,
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CGROUP_INET4_BIND,
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CGROUP_INET6_BIND,
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CGROUP_INET4_CONNECT,
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CGROUP_INET6_CONNECT,
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CGROUP_INET4_POST_BIND,
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CGROUP_INET6_POST_BIND,
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CGROUP_UDP4_SENDMSG,
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CGROUP_UDP6_SENDMSG,
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CGROUP_SYSCTL,
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CGROUP_UDP4_RECVMSG,
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CGROUP_UDP6_RECVMSG,
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CGROUP_GETSOCKOPT,
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CGROUP_SETSOCKOPT,
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CGROUP_INET4_GETPEERNAME,
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CGROUP_INET6_GETPEERNAME,
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CGROUP_INET4_GETSOCKNAME,
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CGROUP_INET6_GETSOCKNAME,
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CGROUP_INET_SOCK_RELEASE,
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CGROUP_LSM_START,
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CGROUP_LSM_END = CGROUP_LSM_START + CGROUP_LSM_NUM - 1,
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MAX_CGROUP_BPF_ATTACH_TYPE
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};
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struct cgroup_bpf {
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/* array of effective progs in this cgroup */
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struct bpf_prog_array __rcu *effective[MAX_CGROUP_BPF_ATTACH_TYPE];
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/* attached progs to this cgroup and attach flags
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* when flags == 0 or BPF_F_ALLOW_OVERRIDE the progs list will
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* have either zero or one element
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* when BPF_F_ALLOW_MULTI the list can have up to BPF_CGROUP_MAX_PROGS
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*/
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struct hlist_head progs[MAX_CGROUP_BPF_ATTACH_TYPE];
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u8 flags[MAX_CGROUP_BPF_ATTACH_TYPE];
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/* list of cgroup shared storages */
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struct list_head storages;
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/* temp storage for effective prog array used by prog_attach/detach */
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struct bpf_prog_array *inactive;
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/* reference counter used to detach bpf programs after cgroup removal */
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struct percpu_ref refcnt;
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/* cgroup_bpf is released using a work queue */
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struct work_struct release_work;
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};
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#else /* CONFIG_CGROUP_BPF */
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struct cgroup_bpf {};
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#endif /* CONFIG_CGROUP_BPF */
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#endif
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