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Message-ID: <aG0l8tXpPDMrakUe@krava>
Date: Tue, 8 Jul 2025 16:06:42 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: Tao Chen <chen.dylane@...ux.dev>
Cc: daniel@...earbox.net, razor@...ckwall.org, andrew+netdev@...n.ch,
davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
pabeni@...hat.com, ast@...nel.org, andrii@...nel.org,
martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
yonghong.song@...ux.dev, john.fastabend@...il.com,
kpsingh@...nel.org, sdf@...ichev.me, haoluo@...gle.com,
mattbobrowski@...gle.com, rostedt@...dmis.org, mhiramat@...nel.org,
mathieu.desnoyers@...icios.com, horms@...nel.org,
willemb@...gle.com, jakub@...udflare.com, pablo@...filter.org,
kadlec@...filter.org, hawk@...nel.org, bpf@...r.kernel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
coreteam@...filter.org
Subject: Re: [PATCH bpf-next v2 1/7] bpf: Add attach_type in bpf_link
On Tue, Jul 08, 2025 at 04:22:22PM +0800, Tao Chen wrote:
> Attach_type will be set when link created from user, it is better
> to record attach_type in bpf_link directly suggested by Andrii.
>
> Signed-off-by: Tao Chen <chen.dylane@...ux.dev>
> ---
> drivers/net/netkit.c | 2 +-
> include/linux/bpf.h | 17 +++++++++++------
> kernel/bpf/bpf_iter.c | 3 ++-
> kernel/bpf/bpf_struct_ops.c | 5 +++--
> kernel/bpf/cgroup.c | 4 ++--
> kernel/bpf/net_namespace.c | 2 +-
> kernel/bpf/syscall.c | 35 +++++++++++++++++++++-------------
> kernel/bpf/tcx.c | 3 ++-
> kernel/bpf/trampoline.c | 10 ++++++----
> kernel/trace/bpf_trace.c | 4 ++--
> net/bpf/bpf_dummy_struct_ops.c | 3 ++-
> net/core/dev.c | 3 ++-
> net/core/sock_map.c | 3 ++-
> net/netfilter/nf_bpf_link.c | 3 ++-
> 14 files changed, 60 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/net/netkit.c b/drivers/net/netkit.c
> index d072a7968f5..5928c99eac7 100644
> --- a/drivers/net/netkit.c
> +++ b/drivers/net/netkit.c
> @@ -775,7 +775,7 @@ static int netkit_link_init(struct netkit_link *nkl,
> struct bpf_prog *prog)
> {
> bpf_link_init(&nkl->link, BPF_LINK_TYPE_NETKIT,
> - &netkit_link_lops, prog);
> + &netkit_link_lops, prog, attr->link_create.attach_type);
> nkl->location = attr->link_create.attach_type;
> nkl->dev = dev;
> return bpf_link_prime(&nkl->link, link_primer);
> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
> index 34dd90ec7fa..12a965362de 100644
> --- a/include/linux/bpf.h
> +++ b/include/linux/bpf.h
> @@ -1735,6 +1735,8 @@ struct bpf_link {
> */
> bool sleepable;
> u32 flags;
> + enum bpf_attach_type attach_type;
> +
there's now 4 byte hole:
jolsa@...va:~/kernel/linux-qemu-1$ pahole -C bpf_link ./vmlinux
struct bpf_link {
atomic64_t refcnt; /* 0 8 */
u32 id; /* 8 4 */
enum bpf_link_type type; /* 12 4 */
const struct bpf_link_ops * ops; /* 16 8 */
struct bpf_prog * prog; /* 24 8 */
bool sleepable; /* 32 1 */
/* XXX 3 bytes hole, try to pack */
u32 flags; /* 36 4 */
enum bpf_attach_type attach_type; /* 40 4 */
/* XXX 4 bytes hole, try to pack */
union {
struct callback_head rcu __attribute__((__aligned__(8))); /* 48 16 */
struct work_struct work; /* 48 80 */
} __attribute__((__aligned__(8))); /* 48 80 */
/* size: 128, cachelines: 2, members: 9 */
/* sum members: 121, holes: 2, sum holes: 7 */
/* forced alignments: 1, forced holes: 1, sum forced holes: 4 */
} __attribute__((__aligned__(8)));
I wonder we could just move sleepable bool to the end to have all aligned
jirka
> /* rcu is used before freeing, work can be used to schedule that
> * RCU-based freeing before that, so they never overlap
> */
> @@ -2034,11 +2036,13 @@ int bpf_prog_ctx_arg_info_init(struct bpf_prog *prog,
>
> #if defined(CONFIG_CGROUP_BPF) && defined(CONFIG_BPF_LSM)
> int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
> - int cgroup_atype);
> + int cgroup_atype,
> + enum bpf_attach_type attach_type);
> void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
> #else
> static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
> - int cgroup_atype)
> + int cgroup_atype,
> + enum bpf_attach_type attach_type)
> {
> return -EOPNOTSUPP;
> }
> @@ -2528,10 +2532,11 @@ int bpf_map_new_fd(struct bpf_map *map, int flags);
> int bpf_prog_new_fd(struct bpf_prog *prog);
>
> void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
> - const struct bpf_link_ops *ops, struct bpf_prog *prog);
> + const struct bpf_link_ops *ops, struct bpf_prog *prog,
> + enum bpf_attach_type attach_type);
> void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
> const struct bpf_link_ops *ops, struct bpf_prog *prog,
> - bool sleepable);
> + bool sleepable, enum bpf_attach_type attach_type);
> int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer);
> int bpf_link_settle(struct bpf_link_primer *primer);
> void bpf_link_cleanup(struct bpf_link_primer *primer);
> @@ -2883,13 +2888,13 @@ bpf_prog_inc_not_zero(struct bpf_prog *prog)
>
> static inline void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
> const struct bpf_link_ops *ops,
> - struct bpf_prog *prog)
> + struct bpf_prog *prog, enum bpf_attach_type attach_type)
> {
> }
>
> static inline void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
> const struct bpf_link_ops *ops, struct bpf_prog *prog,
> - bool sleepable)
> + bool sleepable, enum bpf_attach_type attach_type)
> {
> }
>
> diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c
> index 303ab1f42d3..0cbcae72707 100644
> --- a/kernel/bpf/bpf_iter.c
> +++ b/kernel/bpf/bpf_iter.c
> @@ -552,7 +552,8 @@ int bpf_iter_link_attach(const union bpf_attr *attr, bpfptr_t uattr,
> if (!link)
> return -ENOMEM;
>
> - bpf_link_init(&link->link, BPF_LINK_TYPE_ITER, &bpf_iter_link_lops, prog);
> + bpf_link_init(&link->link, BPF_LINK_TYPE_ITER, &bpf_iter_link_lops, prog,
> + attr->link_create.attach_type);
> link->tinfo = tinfo;
>
> err = bpf_link_prime(&link->link, &link_primer);
> diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
> index 96113633e39..687a3e9c76f 100644
> --- a/kernel/bpf/bpf_struct_ops.c
> +++ b/kernel/bpf/bpf_struct_ops.c
> @@ -808,7 +808,7 @@ static long bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
> goto reset_unlock;
> }
> bpf_link_init(&link->link, BPF_LINK_TYPE_STRUCT_OPS,
> - &bpf_struct_ops_link_lops, prog);
> + &bpf_struct_ops_link_lops, prog, prog->expected_attach_type);
> *plink++ = &link->link;
>
> ksym = kzalloc(sizeof(*ksym), GFP_USER);
> @@ -1351,7 +1351,8 @@ int bpf_struct_ops_link_create(union bpf_attr *attr)
> err = -ENOMEM;
> goto err_out;
> }
> - bpf_link_init(&link->link, BPF_LINK_TYPE_STRUCT_OPS, &bpf_struct_ops_map_lops, NULL);
> + bpf_link_init(&link->link, BPF_LINK_TYPE_STRUCT_OPS, &bpf_struct_ops_map_lops, NULL,
> + attr->link_create.attach_type);
>
> err = bpf_link_prime(&link->link, &link_primer);
> if (err)
> diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
> index cd220e861d6..bacdd0ca741 100644
> --- a/kernel/bpf/cgroup.c
> +++ b/kernel/bpf/cgroup.c
> @@ -867,7 +867,7 @@ static int __cgroup_bpf_attach(struct cgroup *cgrp,
> cgrp->bpf.flags[atype] = saved_flags;
>
> if (type == BPF_LSM_CGROUP) {
> - err = bpf_trampoline_link_cgroup_shim(new_prog, atype);
> + err = bpf_trampoline_link_cgroup_shim(new_prog, atype, type);
> if (err)
> goto cleanup;
> }
> @@ -1495,7 +1495,7 @@ int cgroup_bpf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
> goto out_put_cgroup;
> }
> bpf_link_init(&link->link, BPF_LINK_TYPE_CGROUP, &bpf_cgroup_link_lops,
> - prog);
> + prog, attr->link_create.attach_type);
> link->cgroup = cgrp;
> link->type = attr->link_create.attach_type;
>
> diff --git a/kernel/bpf/net_namespace.c b/kernel/bpf/net_namespace.c
> index 868cc2c4389..63702c86275 100644
> --- a/kernel/bpf/net_namespace.c
> +++ b/kernel/bpf/net_namespace.c
> @@ -501,7 +501,7 @@ int netns_bpf_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
> goto out_put_net;
> }
> bpf_link_init(&net_link->link, BPF_LINK_TYPE_NETNS,
> - &bpf_netns_link_ops, prog);
> + &bpf_netns_link_ops, prog, type);
> net_link->net = net;
> net_link->type = type;
> net_link->netns_type = netns_type;
> diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> index 7db7182a305..14883b3040a 100644
> --- a/kernel/bpf/syscall.c
> +++ b/kernel/bpf/syscall.c
> @@ -3069,7 +3069,7 @@ static int bpf_obj_get(const union bpf_attr *attr)
> */
> void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
> const struct bpf_link_ops *ops, struct bpf_prog *prog,
> - bool sleepable)
> + bool sleepable, enum bpf_attach_type attach_type)
> {
> WARN_ON(ops->dealloc && ops->dealloc_deferred);
> atomic64_set(&link->refcnt, 1);
> @@ -3078,12 +3078,14 @@ void bpf_link_init_sleepable(struct bpf_link *link, enum bpf_link_type type,
> link->id = 0;
> link->ops = ops;
> link->prog = prog;
> + link->attach_type = attach_type;
> }
>
> void bpf_link_init(struct bpf_link *link, enum bpf_link_type type,
> - const struct bpf_link_ops *ops, struct bpf_prog *prog)
> + const struct bpf_link_ops *ops, struct bpf_prog *prog,
> + enum bpf_attach_type attach_type)
> {
> - bpf_link_init_sleepable(link, type, ops, prog, false);
> + bpf_link_init_sleepable(link, type, ops, prog, false, attach_type);
> }
>
> static void bpf_link_free_id(int id)
> @@ -3443,7 +3445,8 @@ static const struct bpf_link_ops bpf_tracing_link_lops = {
> static int bpf_tracing_prog_attach(struct bpf_prog *prog,
> int tgt_prog_fd,
> u32 btf_id,
> - u64 bpf_cookie)
> + u64 bpf_cookie,
> + enum bpf_attach_type attach_type)
> {
> struct bpf_link_primer link_primer;
> struct bpf_prog *tgt_prog = NULL;
> @@ -3511,7 +3514,8 @@ static int bpf_tracing_prog_attach(struct bpf_prog *prog,
> goto out_put_prog;
> }
> bpf_link_init(&link->link.link, BPF_LINK_TYPE_TRACING,
> - &bpf_tracing_link_lops, prog);
> + &bpf_tracing_link_lops, prog, attach_type);
> +
> link->attach_type = prog->expected_attach_type;
> link->link.cookie = bpf_cookie;
>
> @@ -4049,7 +4053,8 @@ static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *pro
> err = -ENOMEM;
> goto out_put_file;
> }
> - bpf_link_init(&link->link, BPF_LINK_TYPE_PERF_EVENT, &bpf_perf_link_lops, prog);
> + bpf_link_init(&link->link, BPF_LINK_TYPE_PERF_EVENT, &bpf_perf_link_lops, prog,
> + attr->link_create.attach_type);
> link->perf_file = perf_file;
>
> err = bpf_link_prime(&link->link, &link_primer);
> @@ -4081,7 +4086,8 @@ static int bpf_perf_link_attach(const union bpf_attr *attr, struct bpf_prog *pro
> #endif /* CONFIG_PERF_EVENTS */
>
> static int bpf_raw_tp_link_attach(struct bpf_prog *prog,
> - const char __user *user_tp_name, u64 cookie)
> + const char __user *user_tp_name, u64 cookie,
> + enum bpf_attach_type attach_type)
> {
> struct bpf_link_primer link_primer;
> struct bpf_raw_tp_link *link;
> @@ -4104,7 +4110,7 @@ static int bpf_raw_tp_link_attach(struct bpf_prog *prog,
> tp_name = prog->aux->attach_func_name;
> break;
> }
> - return bpf_tracing_prog_attach(prog, 0, 0, 0);
> + return bpf_tracing_prog_attach(prog, 0, 0, 0, attach_type);
> case BPF_PROG_TYPE_RAW_TRACEPOINT:
> case BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE:
> if (strncpy_from_user(buf, user_tp_name, sizeof(buf) - 1) < 0)
> @@ -4127,7 +4133,7 @@ static int bpf_raw_tp_link_attach(struct bpf_prog *prog,
> }
> bpf_link_init_sleepable(&link->link, BPF_LINK_TYPE_RAW_TRACEPOINT,
> &bpf_raw_tp_link_lops, prog,
> - tracepoint_is_faultable(btp->tp));
> + tracepoint_is_faultable(btp->tp), attach_type);
> link->btp = btp;
> link->cookie = cookie;
>
> @@ -4168,7 +4174,7 @@ static int bpf_raw_tracepoint_open(const union bpf_attr *attr)
>
> tp_name = u64_to_user_ptr(attr->raw_tracepoint.name);
> cookie = attr->raw_tracepoint.cookie;
> - fd = bpf_raw_tp_link_attach(prog, tp_name, cookie);
> + fd = bpf_raw_tp_link_attach(prog, tp_name, cookie, prog->expected_attach_type);
> if (fd < 0)
> bpf_prog_put(prog);
> return fd;
> @@ -5536,7 +5542,8 @@ static int link_create(union bpf_attr *attr, bpfptr_t uattr)
> ret = bpf_tracing_prog_attach(prog,
> attr->link_create.target_fd,
> attr->link_create.target_btf_id,
> - attr->link_create.tracing.cookie);
> + attr->link_create.tracing.cookie,
> + attr->link_create.attach_type);
> break;
> case BPF_PROG_TYPE_LSM:
> case BPF_PROG_TYPE_TRACING:
> @@ -5545,7 +5552,8 @@ static int link_create(union bpf_attr *attr, bpfptr_t uattr)
> goto out;
> }
> if (prog->expected_attach_type == BPF_TRACE_RAW_TP)
> - ret = bpf_raw_tp_link_attach(prog, NULL, attr->link_create.tracing.cookie);
> + ret = bpf_raw_tp_link_attach(prog, NULL, attr->link_create.tracing.cookie,
> + attr->link_create.attach_type);
> else if (prog->expected_attach_type == BPF_TRACE_ITER)
> ret = bpf_iter_link_attach(attr, uattr, prog);
> else if (prog->expected_attach_type == BPF_LSM_CGROUP)
> @@ -5554,7 +5562,8 @@ static int link_create(union bpf_attr *attr, bpfptr_t uattr)
> ret = bpf_tracing_prog_attach(prog,
> attr->link_create.target_fd,
> attr->link_create.target_btf_id,
> - attr->link_create.tracing.cookie);
> + attr->link_create.tracing.cookie,
> + attr->link_create.attach_type);
> break;
> case BPF_PROG_TYPE_FLOW_DISSECTOR:
> case BPF_PROG_TYPE_SK_LOOKUP:
> diff --git a/kernel/bpf/tcx.c b/kernel/bpf/tcx.c
> index 2e4885e7781..e6a14f408d9 100644
> --- a/kernel/bpf/tcx.c
> +++ b/kernel/bpf/tcx.c
> @@ -301,7 +301,8 @@ static int tcx_link_init(struct tcx_link *tcx,
> struct net_device *dev,
> struct bpf_prog *prog)
> {
> - bpf_link_init(&tcx->link, BPF_LINK_TYPE_TCX, &tcx_link_lops, prog);
> + bpf_link_init(&tcx->link, BPF_LINK_TYPE_TCX, &tcx_link_lops, prog,
> + attr->link_create.attach_type);
> tcx->location = attr->link_create.attach_type;
> tcx->dev = dev;
> return bpf_link_prime(&tcx->link, link_primer);
> diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
> index b1e358c16ee..0e364614c3a 100644
> --- a/kernel/bpf/trampoline.c
> +++ b/kernel/bpf/trampoline.c
> @@ -674,7 +674,8 @@ static const struct bpf_link_ops bpf_shim_tramp_link_lops = {
>
> static struct bpf_shim_tramp_link *cgroup_shim_alloc(const struct bpf_prog *prog,
> bpf_func_t bpf_func,
> - int cgroup_atype)
> + int cgroup_atype,
> + enum bpf_attach_type attach_type)
> {
> struct bpf_shim_tramp_link *shim_link = NULL;
> struct bpf_prog *p;
> @@ -701,7 +702,7 @@ static struct bpf_shim_tramp_link *cgroup_shim_alloc(const struct bpf_prog *prog
> p->expected_attach_type = BPF_LSM_MAC;
> bpf_prog_inc(p);
> bpf_link_init(&shim_link->link.link, BPF_LINK_TYPE_UNSPEC,
> - &bpf_shim_tramp_link_lops, p);
> + &bpf_shim_tramp_link_lops, p, attach_type);
> bpf_cgroup_atype_get(p->aux->attach_btf_id, cgroup_atype);
>
> return shim_link;
> @@ -726,7 +727,8 @@ static struct bpf_shim_tramp_link *cgroup_shim_find(struct bpf_trampoline *tr,
> }
>
> int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
> - int cgroup_atype)
> + int cgroup_atype,
> + enum bpf_attach_type attach_type)
> {
> struct bpf_shim_tramp_link *shim_link = NULL;
> struct bpf_attach_target_info tgt_info = {};
> @@ -763,7 +765,7 @@ int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
>
> /* Allocate and install new shim. */
>
> - shim_link = cgroup_shim_alloc(prog, bpf_func, cgroup_atype);
> + shim_link = cgroup_shim_alloc(prog, bpf_func, cgroup_atype, attach_type);
> if (!shim_link) {
> err = -ENOMEM;
> goto err;
> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index e7f97a9a8bb..ffdde840abb 100644
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -2986,7 +2986,7 @@ int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
> }
>
> bpf_link_init(&link->link, BPF_LINK_TYPE_KPROBE_MULTI,
> - &bpf_kprobe_multi_link_lops, prog);
> + &bpf_kprobe_multi_link_lops, prog, attr->link_create.attach_type);
>
> err = bpf_link_prime(&link->link, &link_primer);
> if (err)
> @@ -3441,7 +3441,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
> link->link.flags = flags;
>
> bpf_link_init(&link->link, BPF_LINK_TYPE_UPROBE_MULTI,
> - &bpf_uprobe_multi_link_lops, prog);
> + &bpf_uprobe_multi_link_lops, prog, attr->link_create.attach_type);
>
> for (i = 0; i < cnt; i++) {
> uprobes[i].uprobe = uprobe_register(d_real_inode(link->path.dentry),
> diff --git a/net/bpf/bpf_dummy_struct_ops.c b/net/bpf/bpf_dummy_struct_ops.c
> index f71f67c6896..812457819b5 100644
> --- a/net/bpf/bpf_dummy_struct_ops.c
> +++ b/net/bpf/bpf_dummy_struct_ops.c
> @@ -171,7 +171,8 @@ int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
> }
> /* prog doesn't take the ownership of the reference from caller */
> bpf_prog_inc(prog);
> - bpf_link_init(&link->link, BPF_LINK_TYPE_STRUCT_OPS, &bpf_struct_ops_link_lops, prog);
> + bpf_link_init(&link->link, BPF_LINK_TYPE_STRUCT_OPS, &bpf_struct_ops_link_lops, prog,
> + prog->expected_attach_type);
>
> op_idx = prog->expected_attach_type;
> err = bpf_struct_ops_prepare_trampoline(tlinks, link,
> diff --git a/net/core/dev.c b/net/core/dev.c
> index be97c440ecd..7969fddc94e 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -10364,7 +10364,8 @@ int bpf_xdp_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
> goto unlock;
> }
>
> - bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog);
> + bpf_link_init(&link->link, BPF_LINK_TYPE_XDP, &bpf_xdp_link_lops, prog,
> + attr->link_create.attach_type);
> link->dev = dev;
> link->flags = attr->link_create.flags;
>
> diff --git a/net/core/sock_map.c b/net/core/sock_map.c
> index 82a14f131d0..fbe9a33ddf1 100644
> --- a/net/core/sock_map.c
> +++ b/net/core/sock_map.c
> @@ -1866,7 +1866,8 @@ int sock_map_link_create(const union bpf_attr *attr, struct bpf_prog *prog)
> }
>
> attach_type = attr->link_create.attach_type;
> - bpf_link_init(&sockmap_link->link, BPF_LINK_TYPE_SOCKMAP, &sock_map_link_ops, prog);
> + bpf_link_init(&sockmap_link->link, BPF_LINK_TYPE_SOCKMAP, &sock_map_link_ops, prog,
> + attach_type);
> sockmap_link->map = map;
> sockmap_link->attach_type = attach_type;
>
> diff --git a/net/netfilter/nf_bpf_link.c b/net/netfilter/nf_bpf_link.c
> index 06b08484470..a054d3b216d 100644
> --- a/net/netfilter/nf_bpf_link.c
> +++ b/net/netfilter/nf_bpf_link.c
> @@ -225,7 +225,8 @@ int bpf_nf_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
> if (!link)
> return -ENOMEM;
>
> - bpf_link_init(&link->link, BPF_LINK_TYPE_NETFILTER, &bpf_nf_link_lops, prog);
> + bpf_link_init(&link->link, BPF_LINK_TYPE_NETFILTER, &bpf_nf_link_lops, prog,
> + attr->link_create.attach_type);
>
> link->hook_ops.hook = nf_hook_run_bpf;
> link->hook_ops.hook_ops_type = NF_HOOK_OP_BPF;
> --
> 2.48.1
>
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