mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Jakub Sitnicki](/assets/img/avatar_default.png)
Extend bpf() syscall subcommands that operate on bpf_link, that is LINK_CREATE, LINK_UPDATE, OBJ_GET_INFO, to accept attach types tied to network namespaces (only flow dissector at the moment). Link-based and prog-based attachment can be used interchangeably, but only one can exist at a time. Attempts to attach a link when a prog is already attached directly, and the other way around, will be met with -EEXIST. Attempts to detach a program when link exists result in -EINVAL. Attachment of multiple links of same attach type to one netns is not supported with the intention to lift the restriction when a use-case presents itself. Because of that link create returns -E2BIG when trying to create another netns link, when one already exists. Link-based attachments to netns don't keep a netns alive by holding a ref to it. Instead links get auto-detached from netns when the latter is being destroyed, using a pernet pre_exit callback. When auto-detached, link lives in defunct state as long there are open FDs for it. -ENOLINK is returned if a user tries to update a defunct link. Because bpf_link to netns doesn't hold a ref to struct net, special care is taken when releasing, updating, or filling link info. The netns might be getting torn down when any of these link operations are in progress. That is why auto-detach and update/release/fill_info are synchronized by the same mutex. Also, link ops have to always check if auto-detach has not happened yet and if netns is still alive (refcnt > 0). Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200531082846.2117903-5-jakub@cloudflare.com
131 lines
5 KiB
C
131 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* internal file - do not include directly */
|
|
|
|
#ifdef CONFIG_NET
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_SOCKET_FILTER, sk_filter,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_CLS, tc_cls_act,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_SCHED_ACT, tc_cls_act,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_XDP, xdp,
|
|
struct xdp_md, struct xdp_buff)
|
|
#ifdef CONFIG_CGROUP_BPF
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SKB, cg_skb,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SOCK, cg_sock,
|
|
struct bpf_sock, struct sock)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SOCK_ADDR, cg_sock_addr,
|
|
struct bpf_sock_addr, struct bpf_sock_addr_kern)
|
|
#endif
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_IN, lwt_in,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_OUT, lwt_out,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_XMIT, lwt_xmit,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_LWT_SEG6LOCAL, lwt_seg6local,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_SOCK_OPS, sock_ops,
|
|
struct bpf_sock_ops, struct bpf_sock_ops_kern)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_SK_SKB, sk_skb,
|
|
struct __sk_buff, struct sk_buff)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_SK_MSG, sk_msg,
|
|
struct sk_msg_md, struct sk_msg)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_FLOW_DISSECTOR, flow_dissector,
|
|
struct __sk_buff, struct bpf_flow_dissector)
|
|
#endif
|
|
#ifdef CONFIG_BPF_EVENTS
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_KPROBE, kprobe,
|
|
bpf_user_pt_regs_t, struct pt_regs)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_TRACEPOINT, tracepoint,
|
|
__u64, u64)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_PERF_EVENT, perf_event,
|
|
struct bpf_perf_event_data, struct bpf_perf_event_data_kern)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_RAW_TRACEPOINT, raw_tracepoint,
|
|
struct bpf_raw_tracepoint_args, u64)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, raw_tracepoint_writable,
|
|
struct bpf_raw_tracepoint_args, u64)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_TRACING, tracing,
|
|
void *, void *)
|
|
#endif
|
|
#ifdef CONFIG_CGROUP_BPF
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_DEVICE, cg_dev,
|
|
struct bpf_cgroup_dev_ctx, struct bpf_cgroup_dev_ctx)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SYSCTL, cg_sysctl,
|
|
struct bpf_sysctl, struct bpf_sysctl_kern)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_CGROUP_SOCKOPT, cg_sockopt,
|
|
struct bpf_sockopt, struct bpf_sockopt_kern)
|
|
#endif
|
|
#ifdef CONFIG_BPF_LIRC_MODE2
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_LIRC_MODE2, lirc_mode2,
|
|
__u32, u32)
|
|
#endif
|
|
#ifdef CONFIG_INET
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_SK_REUSEPORT, sk_reuseport,
|
|
struct sk_reuseport_md, struct sk_reuseport_kern)
|
|
#endif
|
|
#if defined(CONFIG_BPF_JIT)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_STRUCT_OPS, bpf_struct_ops,
|
|
void *, void *)
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_EXT, bpf_extension,
|
|
void *, void *)
|
|
#ifdef CONFIG_BPF_LSM
|
|
BPF_PROG_TYPE(BPF_PROG_TYPE_LSM, lsm,
|
|
void *, void *)
|
|
#endif /* CONFIG_BPF_LSM */
|
|
#endif
|
|
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY, array_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_PERCPU_ARRAY, percpu_array_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_PROG_ARRAY, prog_array_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_PERF_EVENT_ARRAY, perf_event_array_map_ops)
|
|
#ifdef CONFIG_CGROUPS
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_CGROUP_ARRAY, cgroup_array_map_ops)
|
|
#endif
|
|
#ifdef CONFIG_CGROUP_BPF
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_CGROUP_STORAGE, cgroup_storage_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE, cgroup_storage_map_ops)
|
|
#endif
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_HASH, htab_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_PERCPU_HASH, htab_percpu_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_LRU_HASH, htab_lru_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_LRU_PERCPU_HASH, htab_lru_percpu_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_LPM_TRIE, trie_map_ops)
|
|
#ifdef CONFIG_PERF_EVENTS
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_STACK_TRACE, stack_trace_map_ops)
|
|
#endif
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY_OF_MAPS, array_of_maps_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_HASH_OF_MAPS, htab_of_maps_map_ops)
|
|
#ifdef CONFIG_NET
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_DEVMAP, dev_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_DEVMAP_HASH, dev_map_hash_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_SK_STORAGE, sk_storage_map_ops)
|
|
#if defined(CONFIG_BPF_STREAM_PARSER)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_SOCKMAP, sock_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_SOCKHASH, sock_hash_ops)
|
|
#endif
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_CPUMAP, cpu_map_ops)
|
|
#if defined(CONFIG_XDP_SOCKETS)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_XSKMAP, xsk_map_ops)
|
|
#endif
|
|
#ifdef CONFIG_INET
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY, reuseport_array_ops)
|
|
#endif
|
|
#endif
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_QUEUE, queue_map_ops)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_STACK, stack_map_ops)
|
|
#if defined(CONFIG_BPF_JIT)
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_STRUCT_OPS, bpf_struct_ops_map_ops)
|
|
#endif
|
|
BPF_MAP_TYPE(BPF_MAP_TYPE_RINGBUF, ringbuf_map_ops)
|
|
|
|
BPF_LINK_TYPE(BPF_LINK_TYPE_RAW_TRACEPOINT, raw_tracepoint)
|
|
BPF_LINK_TYPE(BPF_LINK_TYPE_TRACING, tracing)
|
|
#ifdef CONFIG_CGROUP_BPF
|
|
BPF_LINK_TYPE(BPF_LINK_TYPE_CGROUP, cgroup)
|
|
#endif
|
|
BPF_LINK_TYPE(BPF_LINK_TYPE_ITER, iter)
|
|
#ifdef CONFIG_NET
|
|
BPF_LINK_TYPE(BPF_LINK_TYPE_NETNS, netns)
|
|
#endif
|