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Date: Thu, 16 Aug 2018 16:14:28 -0700
From: Petar Penkov <ppenkov@...gle.com>
To: Song Liu <liu.song.a23@...il.com>
Cc: Petar Penkov <peterpenkov96@...il.com>,
Networking <netdev@...r.kernel.org>,
"David S . Miller" <davem@...emloft.net>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
simon.horman@...ronome.com, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [bpf-next RFC 1/3] flow_dissector: implements flow dissector BPF hook
On Thu, Aug 16, 2018 at 3:40 PM, Song Liu <liu.song.a23@...il.com> wrote:
>
> On Thu, Aug 16, 2018 at 9:44 AM, Petar Penkov <peterpenkov96@...il.com> wrote:
> > From: Petar Penkov <ppenkov@...gle.com>
> >
> > Adds a hook for programs of type BPF_PROG_TYPE_FLOW_DISSECTOR and
> > attach type BPF_FLOW_DISSECTOR that is executed in the flow dissector
> > path. The BPF program is kept as a global variable so it is
> > accessible to all flow dissectors.
> >
> > Signed-off-by: Petar Penkov <ppenkov@...gle.com>
> > Signed-off-by: Willem de Bruijn <willemb@...gle.com>
> > ---
> > include/linux/bpf_types.h | 1 +
> > include/linux/skbuff.h | 7 +
> > include/net/flow_dissector.h | 16 +++
> > include/uapi/linux/bpf.h | 14 +-
> > kernel/bpf/syscall.c | 8 ++
> > kernel/bpf/verifier.c | 2 +
> > net/core/filter.c | 157 ++++++++++++++++++++++
> > net/core/flow_dissector.c | 76 +++++++++++
> > tools/bpf/bpftool/prog.c | 1 +
> > tools/include/uapi/linux/bpf.h | 5 +-
> > tools/lib/bpf/libbpf.c | 2 +
> > tools/testing/selftests/bpf/bpf_helpers.h | 3 +
> > 12 files changed, 290 insertions(+), 2 deletions(-)
> >
> > diff --git a/include/linux/bpf_types.h b/include/linux/bpf_types.h
> > index cd26c090e7c0..22083712dd18 100644
> > --- a/include/linux/bpf_types.h
> > +++ b/include/linux/bpf_types.h
> > @@ -32,6 +32,7 @@ BPF_PROG_TYPE(BPF_PROG_TYPE_LIRC_MODE2, lirc_mode2)
> > #ifdef CONFIG_INET
> > BPF_PROG_TYPE(BPF_PROG_TYPE_SK_REUSEPORT, sk_reuseport)
> > #endif
> > +BPF_PROG_TYPE(BPF_PROG_TYPE_FLOW_DISSECTOR, flow_dissector)
> >
> > BPF_MAP_TYPE(BPF_MAP_TYPE_ARRAY, array_map_ops)
> > BPF_MAP_TYPE(BPF_MAP_TYPE_PERCPU_ARRAY, percpu_array_map_ops)
> > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
> > index 17a13e4785fc..ce0e863f02a2 100644
> > --- a/include/linux/skbuff.h
> > +++ b/include/linux/skbuff.h
> > @@ -243,6 +243,8 @@ struct scatterlist;
> > struct pipe_inode_info;
> > struct iov_iter;
> > struct napi_struct;
> > +struct bpf_prog;
> > +union bpf_attr;
> >
> > #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
> > struct nf_conntrack {
> > @@ -1192,6 +1194,11 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
> > const struct flow_dissector_key *key,
> > unsigned int key_count);
> >
> > +int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
> > + struct bpf_prog *prog);
> > +
> > +int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr);
> > +
> > bool __skb_flow_dissect(const struct sk_buff *skb,
> > struct flow_dissector *flow_dissector,
> > void *target_container,
> > diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
> > index 6a4586dcdede..edb919d320c1 100644
> > --- a/include/net/flow_dissector.h
> > +++ b/include/net/flow_dissector.h
> > @@ -270,6 +270,22 @@ __be32 flow_get_u32_dst(const struct flow_keys *flow);
> > extern struct flow_dissector flow_keys_dissector;
> > extern struct flow_dissector flow_keys_basic_dissector;
> >
> > +/* struct bpf_flow_dissect_cb:
> > + *
> > + * This struct is used to pass parameters to BPF programs of type
> > + * BPF_PROG_TYPE_FLOW_DISSECTOR. Before such a program is run, the caller sets
> > + * the control block of the skb to be a struct of this type. The first field is
> > + * used to communicate the next header offset between the BPF programs and the
> > + * first value of it is passed from the kernel. The last two fields are used for
> > + * writing out flow keys.
> > + */
> > +struct bpf_flow_dissect_cb {
> > + u16 nhoff;
> > + u16 unused;
> > + void *target_container;
> > + struct flow_dissector *flow_dissector;
> > +};
> > +
> > /* struct flow_keys_digest:
> > *
> > * This structure is used to hold a digest of the full flow keys. This is a
> > diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
> > index 66917a4eba27..8bc0fdab685d 100644
> > --- a/include/uapi/linux/bpf.h
> > +++ b/include/uapi/linux/bpf.h
> > @@ -152,6 +152,7 @@ enum bpf_prog_type {
> > BPF_PROG_TYPE_LWT_SEG6LOCAL,
> > BPF_PROG_TYPE_LIRC_MODE2,
> > BPF_PROG_TYPE_SK_REUSEPORT,
> > + BPF_PROG_TYPE_FLOW_DISSECTOR,
> > };
> >
> > enum bpf_attach_type {
> > @@ -172,6 +173,7 @@ enum bpf_attach_type {
> > BPF_CGROUP_UDP4_SENDMSG,
> > BPF_CGROUP_UDP6_SENDMSG,
> > BPF_LIRC_MODE2,
> > + BPF_FLOW_DISSECTOR,
> > __MAX_BPF_ATTACH_TYPE
> > };
> >
> > @@ -2141,6 +2143,15 @@ union bpf_attr {
> > * request in the skb.
> > * Return
> > * 0 on success, or a negative error in case of failure.
> > + *
> > + * int bpf_flow_dissector_write_keys(const struct sk_buff *skb, const void *from, u32 len, enum flow_dissector_key_id key_id)
> > + * Description
> > + * Try to write *len* bytes from the source pointer into the offset
> > + * of the key with id *key_id*. If *len* is different from the
> > + * size of the key, an error is returned. If the key is not used,
> > + * this function exits with no effect and code 0.
> > + * Return
> > + * 0 on success, negative error in case of failure.
> > */
> > #define __BPF_FUNC_MAPPER(FN) \
> > FN(unspec), \
> > @@ -2226,7 +2237,8 @@ union bpf_attr {
> > FN(get_current_cgroup_id), \
> > FN(get_local_storage), \
> > FN(sk_select_reuseport), \
> > - FN(skb_ancestor_cgroup_id),
> > + FN(skb_ancestor_cgroup_id), \
> > + FN(flow_dissector_write_keys),
> >
> > /* integer value in 'imm' field of BPF_CALL instruction selects which helper
> > * function eBPF program intends to call
> > diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
> > index 43727ed0d94a..a06568841a92 100644
> > --- a/kernel/bpf/syscall.c
> > +++ b/kernel/bpf/syscall.c
> > @@ -1616,6 +1616,9 @@ static int bpf_prog_attach(const union bpf_attr *attr)
> > case BPF_LIRC_MODE2:
> > ptype = BPF_PROG_TYPE_LIRC_MODE2;
> > break;
> > + case BPF_FLOW_DISSECTOR:
> > + ptype = BPF_PROG_TYPE_FLOW_DISSECTOR;
> > + break;
> > default:
> > return -EINVAL;
> > }
> > @@ -1637,6 +1640,9 @@ static int bpf_prog_attach(const union bpf_attr *attr)
> > case BPF_PROG_TYPE_LIRC_MODE2:
> > ret = lirc_prog_attach(attr, prog);
> > break;
> > + case BPF_PROG_TYPE_FLOW_DISSECTOR:
> > + ret = skb_flow_dissector_bpf_prog_attach(attr, prog);
> > + break;
> > default:
> > ret = cgroup_bpf_prog_attach(attr, ptype, prog);
> > }
> > @@ -1689,6 +1695,8 @@ static int bpf_prog_detach(const union bpf_attr *attr)
> > return sockmap_get_from_fd(attr, BPF_PROG_TYPE_SK_SKB, NULL);
> > case BPF_LIRC_MODE2:
> > return lirc_prog_detach(attr);
> > + case BPF_FLOW_DISSECTOR:
> > + return skb_flow_dissector_bpf_prog_detach(attr);
> > default:
> > return -EINVAL;
> > }
> > diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> > index ca90679a7fe5..6d3f268fa8e0 100644
> > --- a/kernel/bpf/verifier.c
> > +++ b/kernel/bpf/verifier.c
> > @@ -1321,6 +1321,7 @@ static bool may_access_direct_pkt_data(struct bpf_verifier_env *env,
> > case BPF_PROG_TYPE_LWT_XMIT:
> > case BPF_PROG_TYPE_SK_SKB:
> > case BPF_PROG_TYPE_SK_MSG:
> > + case BPF_PROG_TYPE_FLOW_DISSECTOR:
> > if (meta)
> > return meta->pkt_access;
> >
> > @@ -3976,6 +3977,7 @@ static bool may_access_skb(enum bpf_prog_type type)
> > case BPF_PROG_TYPE_SOCKET_FILTER:
> > case BPF_PROG_TYPE_SCHED_CLS:
> > case BPF_PROG_TYPE_SCHED_ACT:
> > + case BPF_PROG_TYPE_FLOW_DISSECTOR:
> > return true;
> > default:
> > return false;
> > diff --git a/net/core/filter.c b/net/core/filter.c
> > index fd423ce3da34..03d3037e6508 100644
> > --- a/net/core/filter.c
> > +++ b/net/core/filter.c
> > @@ -4820,6 +4820,111 @@ bool bpf_helper_changes_pkt_data(void *func)
> > return false;
> > }
> >
> > +BPF_CALL_4(bpf_flow_dissector_write_keys, const struct sk_buff *, skb,
> > + const void *, from, u32, len, enum flow_dissector_key_id, key_id)
> > +{
> > + struct bpf_flow_dissect_cb *cb;
> > + void *dest;
> > +
> > + cb = (struct bpf_flow_dissect_cb *)bpf_skb_cb(skb);
> > +
> > + /* Make sure the dissector actually uses the key. It is not an error if
> > + * it does not, but we should not continue past this point in that case
> > + */
> > + if (!dissector_uses_key(cb->flow_dissector, key_id))
> > + return 0;
> > +
> > + /* Make sure the length is correct */
> > + switch (key_id) {
> > + case FLOW_DISSECTOR_KEY_CONTROL:
> > + case FLOW_DISSECTOR_KEY_ENC_CONTROL:
> > + if (len != sizeof(struct flow_dissector_key_control))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_BASIC:
> > + if (len != sizeof(struct flow_dissector_key_basic))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_IPV4_ADDRS:
> > + case FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS:
> > + if (len != sizeof(struct flow_dissector_key_ipv4_addrs))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_IPV6_ADDRS:
> > + case FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS:
> > + if (len != sizeof(struct flow_dissector_key_ipv6_addrs))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_ICMP:
> > + if (len != sizeof(struct flow_dissector_key_icmp))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_PORTS:
> > + case FLOW_DISSECTOR_KEY_ENC_PORTS:
> > + if (len != sizeof(struct flow_dissector_key_ports))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_ETH_ADDRS:
> > + if (len != sizeof(struct flow_dissector_key_eth_addrs))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_TIPC:
> > + if (len != sizeof(struct flow_dissector_key_tipc))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_ARP:
> > + if (len != sizeof(struct flow_dissector_key_arp))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_VLAN:
> > + case FLOW_DISSECTOR_KEY_CVLAN:
> > + if (len != sizeof(struct flow_dissector_key_vlan))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_FLOW_LABEL:
> > + if (len != sizeof(struct flow_dissector_key_tags))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_GRE_KEYID:
> > + case FLOW_DISSECTOR_KEY_ENC_KEYID:
> > + case FLOW_DISSECTOR_KEY_MPLS_ENTROPY:
> > + if (len != sizeof(struct flow_dissector_key_keyid))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_MPLS:
> > + if (len != sizeof(struct flow_dissector_key_mpls))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_TCP:
> > + if (len != sizeof(struct flow_dissector_key_tcp))
> > + return -EINVAL;
> > + break;
> > + case FLOW_DISSECTOR_KEY_IP:
> > + case FLOW_DISSECTOR_KEY_ENC_IP:
> > + if (len != sizeof(struct flow_dissector_key_ip))
> > + return -EINVAL;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + dest = skb_flow_dissector_target(cb->flow_dissector, key_id,
> > + cb->target_container);
> > +
> > + memcpy(dest, from, len);
> > + return 0;
> > +}
> > +
> > +static const struct bpf_func_proto bpf_flow_dissector_write_keys_proto = {
> > + .func = bpf_flow_dissector_write_keys,
> > + .gpl_only = false,
> > + .ret_type = RET_INTEGER,
> > + .arg1_type = ARG_PTR_TO_CTX,
> > + .arg2_type = ARG_PTR_TO_MEM,
> > + .arg3_type = ARG_CONST_SIZE,
> > + .arg4_type = ARG_ANYTHING,
> > +};
> > +
> > static const struct bpf_func_proto *
> > bpf_base_func_proto(enum bpf_func_id func_id)
> > {
> > @@ -5100,6 +5205,19 @@ sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> > }
> > }
> >
> > +static const struct bpf_func_proto *
> > +flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> > +{
> > + switch (func_id) {
> > + case BPF_FUNC_skb_load_bytes:
> > + return &bpf_skb_load_bytes_proto;
> > + case BPF_FUNC_flow_dissector_write_keys:
> > + return &bpf_flow_dissector_write_keys_proto;
> > + default:
> > + return bpf_base_func_proto(func_id);
> > + }
> > +}
> > +
> > static const struct bpf_func_proto *
> > lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> > {
> > @@ -5738,6 +5856,35 @@ static bool sk_msg_is_valid_access(int off, int size,
> > return true;
> > }
> >
> > +static bool flow_dissector_is_valid_access(int off, int size,
> > + enum bpf_access_type type,
> > + const struct bpf_prog *prog,
> > + struct bpf_insn_access_aux *info)
> > +{
> > + if (type == BPF_WRITE) {
> > + switch (off) {
> > + case bpf_ctx_range(struct __sk_buff, cb[0]):
> > + break;
> > + default:
> > + return false;
> > + }
> > + }
> > +
> > + switch (off) {
> > + case bpf_ctx_range(struct __sk_buff, data):
> > + info->reg_type = PTR_TO_PACKET;
> > + break;
> > + case bpf_ctx_range(struct __sk_buff, data_end):
> > + info->reg_type = PTR_TO_PACKET_END;
> > + break;
> > + case bpf_ctx_range_till(struct __sk_buff, family, local_port):
> > + case bpf_ctx_range_till(struct __sk_buff, cb[1], cb[4]):
> > + return false;
> > + }
> > +
> > + return bpf_skb_is_valid_access(off, size, type, prog, info);
> > +}
> > +
> > static u32 bpf_convert_ctx_access(enum bpf_access_type type,
> > const struct bpf_insn *si,
> > struct bpf_insn *insn_buf,
> > @@ -6995,6 +7142,16 @@ const struct bpf_verifier_ops sk_msg_verifier_ops = {
> > const struct bpf_prog_ops sk_msg_prog_ops = {
> > };
> >
> > +const struct bpf_verifier_ops flow_dissector_verifier_ops = {
> > + .get_func_proto = flow_dissector_func_proto,
> > + .is_valid_access = flow_dissector_is_valid_access,
> > + .convert_ctx_access = bpf_convert_ctx_access,
> > + .gen_ld_abs = bpf_gen_ld_abs,
> > +};
> > +
> > +const struct bpf_prog_ops flow_dissector_prog_ops = {
> > +};
> > +
> > int sk_detach_filter(struct sock *sk)
> > {
> > int ret = -ENOENT;
> > diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
> > index ce9eeeb7c024..767daa231f04 100644
> > --- a/net/core/flow_dissector.c
> > +++ b/net/core/flow_dissector.c
> > @@ -25,6 +25,11 @@
> > #include <net/flow_dissector.h>
> > #include <scsi/fc/fc_fcoe.h>
> > #include <uapi/linux/batadv_packet.h>
> > +#include <linux/bpf.h>
> > +
> > +/* BPF program accessible by all flow dissectors */
> > +static struct bpf_prog __rcu *flow_dissector_prog;
> > +static DEFINE_MUTEX(flow_dissector_mutex);
> >
> > static void dissector_set_key(struct flow_dissector *flow_dissector,
> > enum flow_dissector_key_id key_id)
> > @@ -62,6 +67,40 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
> > }
> > EXPORT_SYMBOL(skb_flow_dissector_init);
> >
> > +int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
> > + struct bpf_prog *prog)
> > +{
> > + struct bpf_prog *attached;
> > +
> > + mutex_lock(&flow_dissector_mutex);
> > + attached = rcu_dereference_protected(flow_dissector_prog,
> > + lockdep_is_held(&flow_dissector_mutex));
> > + if (attached) {
> > + /* Only one BPF program can be attached at a time */
> > + mutex_unlock(&flow_dissector_mutex);
> > + return -EEXIST;
> > + }
> > + rcu_assign_pointer(flow_dissector_prog, prog);
> > + mutex_unlock(&flow_dissector_mutex);
> > + return 0;
> > +}
> > +
> > +int skb_flow_dissector_bpf_prog_detach(const union bpf_attr *attr)
> > +{
> > + struct bpf_prog *attached;
> > +
> > + mutex_lock(&flow_dissector_mutex);
> > + attached = rcu_dereference_protected(flow_dissector_prog,
> > + lockdep_is_held(&flow_dissector_mutex));
> > + if (!flow_dissector_prog) {
> > + mutex_unlock(&flow_dissector_mutex);
> > + return -EINVAL;
> > + }
> > + bpf_prog_put(attached);
> > + RCU_INIT_POINTER(flow_dissector_prog, NULL);
> > + mutex_unlock(&flow_dissector_mutex);
> > + return 0;
> > +}
> > /**
> > * skb_flow_get_be16 - extract be16 entity
> > * @skb: sk_buff to extract from
> > @@ -619,6 +658,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
> > struct flow_dissector_key_vlan *key_vlan;
> > enum flow_dissect_ret fdret;
> > enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
> > + struct bpf_prog *attached;
> > int num_hdrs = 0;
> > u8 ip_proto = 0;
> > bool ret;
> > @@ -658,6 +698,42 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
> > FLOW_DISSECTOR_KEY_BASIC,
> > target_container);
> >
> > + rcu_read_lock();
> > + attached = rcu_dereference(flow_dissector_prog);
> > + if (attached) {
> > + /* Note that even though the const qualifier is discarded
> > + * throughout the execution of the BPF program, all changes(the
> > + * control block) are reverted after the BPF program returns.
> > + * Therefore, __skb_flow_dissect does not alter the skb.
> > + */
> > + struct bpf_flow_dissect_cb *cb;
> > + u8 cb_saved[BPF_SKB_CB_LEN];
> > + u32 result;
> > +
> > + cb = (struct bpf_flow_dissect_cb *)(bpf_skb_cb((struct sk_buff *)skb));
> > +
> > + /* Save Control Block */
> > + memcpy(cb_saved, cb, sizeof(cb_saved));
> > + memset(cb, 0, sizeof(cb_saved));
> > +
> > + /* Pass parameters to the BPF program */
> > + cb->nhoff = nhoff;
> > + cb->target_container = target_container;
> > + cb->flow_dissector = flow_dissector;
> > +
> > + bpf_compute_data_pointers((struct sk_buff *)skb);
> > + result = BPF_PROG_RUN(attached, skb);
> > +
> > + /* Restore state */
> > + memcpy(cb, cb_saved, sizeof(cb_saved));
> > +
> > + key_control->thoff = min_t(u16, key_control->thoff,
> > + skb ? skb->len : hlen);
> > + rcu_read_unlock();
> > + return result == BPF_OK;
> > + }
>
> If the BPF program cannot handle certain protocol, shall we fall back
> to the built-in logic? Otherwise, all BPF programs need to have some
> code for all protocols.
>
> Song
I believe that if we fall back to the built-in logic we lose all security
guarantees from BPF and this is why the code does not support
fall back.
Petar
>
>
> > + rcu_read_unlock();
> > +
> > if (dissector_uses_key(flow_dissector,
> > FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
> > struct ethhdr *eth = eth_hdr(skb);
> > diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
> > index dce960d22106..b1cd3bc8db70 100644
> > --- a/tools/bpf/bpftool/prog.c
> > +++ b/tools/bpf/bpftool/prog.c
> > @@ -74,6 +74,7 @@ static const char * const prog_type_name[] = {
> > [BPF_PROG_TYPE_RAW_TRACEPOINT] = "raw_tracepoint",
> > [BPF_PROG_TYPE_CGROUP_SOCK_ADDR] = "cgroup_sock_addr",
> > [BPF_PROG_TYPE_LIRC_MODE2] = "lirc_mode2",
> > + [BPF_PROG_TYPE_FLOW_DISSECTOR] = "flow_dissector",
> > };
> >
> > static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
> > diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h
> > index 66917a4eba27..acd74a0dd063 100644
> > --- a/tools/include/uapi/linux/bpf.h
> > +++ b/tools/include/uapi/linux/bpf.h
> > @@ -152,6 +152,7 @@ enum bpf_prog_type {
> > BPF_PROG_TYPE_LWT_SEG6LOCAL,
> > BPF_PROG_TYPE_LIRC_MODE2,
> > BPF_PROG_TYPE_SK_REUSEPORT,
> > + BPF_PROG_TYPE_FLOW_DISSECTOR,
> > };
> >
> > enum bpf_attach_type {
> > @@ -172,6 +173,7 @@ enum bpf_attach_type {
> > BPF_CGROUP_UDP4_SENDMSG,
> > BPF_CGROUP_UDP6_SENDMSG,
> > BPF_LIRC_MODE2,
> > + BPF_FLOW_DISSECTOR,
> > __MAX_BPF_ATTACH_TYPE
> > };
> >
> > @@ -2226,7 +2228,8 @@ union bpf_attr {
> > FN(get_current_cgroup_id), \
> > FN(get_local_storage), \
> > FN(sk_select_reuseport), \
> > - FN(skb_ancestor_cgroup_id),
> > + FN(skb_ancestor_cgroup_id), \
> > + FN(flow_dissector_write_keys),
> >
> > /* integer value in 'imm' field of BPF_CALL instruction selects which helper
> > * function eBPF program intends to call
> > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> > index 2abd0f112627..0c749ce1b717 100644
> > --- a/tools/lib/bpf/libbpf.c
> > +++ b/tools/lib/bpf/libbpf.c
> > @@ -1502,6 +1502,7 @@ static bool bpf_prog_type__needs_kver(enum bpf_prog_type type)
> > case BPF_PROG_TYPE_CGROUP_SOCK_ADDR:
> > case BPF_PROG_TYPE_LIRC_MODE2:
> > case BPF_PROG_TYPE_SK_REUSEPORT:
> > + case BPF_PROG_TYPE_FLOW_DISSECTOR:
> > return false;
> > case BPF_PROG_TYPE_UNSPEC:
> > case BPF_PROG_TYPE_KPROBE:
> > @@ -2121,6 +2122,7 @@ static const struct {
> > BPF_PROG_SEC("sk_skb", BPF_PROG_TYPE_SK_SKB),
> > BPF_PROG_SEC("sk_msg", BPF_PROG_TYPE_SK_MSG),
> > BPF_PROG_SEC("lirc_mode2", BPF_PROG_TYPE_LIRC_MODE2),
> > + BPF_PROG_SEC("flow_dissector", BPF_PROG_TYPE_FLOW_DISSECTOR),
> > BPF_SA_PROG_SEC("cgroup/bind4", BPF_CGROUP_INET4_BIND),
> > BPF_SA_PROG_SEC("cgroup/bind6", BPF_CGROUP_INET6_BIND),
> > BPF_SA_PROG_SEC("cgroup/connect4", BPF_CGROUP_INET4_CONNECT),
> > diff --git a/tools/testing/selftests/bpf/bpf_helpers.h b/tools/testing/selftests/bpf/bpf_helpers.h
> > index e4be7730222d..4204c496a04f 100644
> > --- a/tools/testing/selftests/bpf/bpf_helpers.h
> > +++ b/tools/testing/selftests/bpf/bpf_helpers.h
> > @@ -143,6 +143,9 @@ static unsigned long long (*bpf_skb_cgroup_id)(void *ctx) =
> > (void *) BPF_FUNC_skb_cgroup_id;
> > static unsigned long long (*bpf_skb_ancestor_cgroup_id)(void *ctx, int level) =
> > (void *) BPF_FUNC_skb_ancestor_cgroup_id;
> > +static int (*bpf_flow_dissector_write_keys)(void *ctx, void *src, int len,
> > + int key) =
> > + (void *) BPF_FUNC_flow_dissector_write_keys;
> >
> > /* llvm builtin functions that eBPF C program may use to
> > * emit BPF_LD_ABS and BPF_LD_IND instructions
> > --
> > 2.18.0.865.gffc8e1a3cd6-goog
> >
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