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Add support and doc for new helpers from libbpf repo
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Added the support in libbpf.c and helpers.h for
new helpers for libbpf repo. Also added these helpers
in kernel-versions.md.

Signed-off-by: Yonghong Song <[email protected]>
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@yonghong-song
yonghong-song committed Jul 11, 2022
1 parent 6a29236 commit b5c78af
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Showing 4 changed files with 236 additions and 4 deletions.
12 changes: 12 additions & 0 deletions docs/kernel-versions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -221,6 +221,10 @@ Helper | Kernel version | License | Commit |
`BPF_FUNC_csum_update()` | 4.9 | | [`36bbef52c7eb`](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=36bbef52c7eb646ed6247055a2acd3851e317857)
`BPF_FUNC_current_task_under_cgroup()` | 4.9 | | [`60d20f9195b2`](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=60d20f9195b260bdf0ac10c275ae9f6016f9c069)
`BPF_FUNC_d_path()` | 5.10 | | [`6e22ab9da793`](https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit?id=6e22ab9da79343532cd3cde39df25e5a5478c692)
`BPF_FUNC_dynptr_data()` | 5.19 | | [`34d4ef5775f7`](https://github.com/torvalds/linux/commit/34d4ef5775f776ec4b0d53a02d588bf3195cada6)
`BPF_FUNC_dynptr_from_mem()` | 5.19 | | [`263ae152e962`](https://github.com/torvalds/linux/commit/263ae152e96253f40c2c276faad8629e096b3bad)
`BPF_FUNC_dynptr_read()` | 5.19 | | [`13bbbfbea759`](https://github.com/torvalds/linux/commit/13bbbfbea7598ea9f8d9c3d73bf053bb57f9c4b2)
`BPF_FUNC_dynptr_write()` | 5.19 | | [`13bbbfbea759`](https://github.com/torvalds/linux/commit/13bbbfbea7598ea9f8d9c3d73bf053bb57f9c4b2)
`BPF_FUNC_fib_lookup()` | 4.18 | GPL | [`87f5fc7e48dd`](https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit/?id=87f5fc7e48dd3175b30dd03b41564e1a8e136323)
`BPF_FUNC_find_vma()` | 5.17 | | [`7c7e3d31e785`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit?id=7c7e3d31e7856a8260a254f8c71db416f7f9f5a1)
`BPF_FUNC_for_each_map_elem()` | 5.13 | | [`69c087ba6225`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit?id=69c087ba6225b574afb6e505b72cb75242a3d844)
Expand Down Expand Up @@ -308,10 +312,13 @@ Helper | Kernel version | License | Commit |
`BPF_FUNC_redirect_peer()` | 5.10 | | [`9aa1206e8f48`](https://github.com/torvalds/linux/commit/9aa1206e8f48222f35a0c809f33b2f4aaa1e2661)
`BPF_FUNC_reserve_hdr_opt()` | 5.10 | | [`0813a841566f`](https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit?id=0813a841566f0962a5551be7749b43c45f0022a0)
`BPF_FUNC_ringbuf_discard()` | 5.8 | | [`457f44363a88`](https://github.com/torvalds/linux/commit/457f44363a8894135c85b7a9afd2bd8196db24ab)
`BPF_FUNC_ringbuf_discard_dynptr()` | 5.19 | | [`bc34dee65a65`](https://github.com/torvalds/linux/commit/bc34dee65a65e9c920c420005b8a43f2a721a458)
`BPF_FUNC_ringbuf_output()` | 5.8 | | [`457f44363a88`](https://github.com/torvalds/linux/commit/457f44363a8894135c85b7a9afd2bd8196db24ab)
`BPF_FUNC_ringbuf_query()` | 5.8 | | [`457f44363a88`](https://github.com/torvalds/linux/commit/457f44363a8894135c85b7a9afd2bd8196db24ab)
`BPF_FUNC_ringbuf_reserve()` | 5.8 | | [`457f44363a88`](https://github.com/torvalds/linux/commit/457f44363a8894135c85b7a9afd2bd8196db24ab)
`BPF_FUNC_ringbuf_reserve_dynptr()` | 5.19 | | [`bc34dee65a65`](https://github.com/torvalds/linux/commit/bc34dee65a65e9c920c420005b8a43f2a721a458)
`BPF_FUNC_ringbuf_submit()` | 5.8 | | [`457f44363a88`](https://github.com/torvalds/linux/commit/457f44363a8894135c85b7a9afd2bd8196db24ab)
`BPF_FUNC_ringbuf_submit_dynptr()` | 5.19 | | [`bc34dee65a65`](https://github.com/torvalds/linux/commit/bc34dee65a65e9c920c420005b8a43f2a721a458)
`BPF_FUNC_send_signal()` | 5.3 | | [`8b401f9ed244`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=8b401f9ed2441ad9e219953927a842d24ed051fc)
`BPF_FUNC_send_signal_thread()` | 5.5 | | [`8482941f0906`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=8482941f09067da42f9c3362e15bfb3f3c19d610)
`BPF_FUNC_seq_printf()` | 5.7 | GPL | [`492e639f0c22`](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next/+/492e639f0c222784e2e0f121966375f641c61b15)
Expand Down Expand Up @@ -357,6 +364,7 @@ Helper | Kernel version | License | Commit |
`BPF_FUNC_skb_vlan_pop()` | 4.3 | | [`4e10df9a60d9`](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4e10df9a60d96ced321dd2af71da558c6b750078)
`BPF_FUNC_skb_vlan_push()` | 4.3 | | [`4e10df9a60d9`](https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4e10df9a60d96ced321dd2af71da558c6b750078)
`BPF_FUNC_skc_lookup_tcp()` | 5.2 | | [`edbf8c01de5a`](https://kernel.googlesource.com/pub/scm/linux/kernel/git/davem/net-next/+/edbf8c01de5a104a71ed6df2bf6421ceb2836a8e)
`BPF_FUNC_skc_to_mctcp_sock()` | 5.19 | | [`3bc253c2e652`](https://github.com/torvalds/linux/commit/3bc253c2e652cf5f12cd8c00d80d8ec55d67d1a7)
`BPF_FUNC_skc_to_tcp_sock()` | 5.9 | | [`478cfbdf5f13`](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next/+/478cfbdf5f13dfe09cfd0b1cbac821f5e27f6108)
`BPF_FUNC_skc_to_tcp_request_sock()` | 5.9 | | [`478cfbdf5f13`](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next/+/478cfbdf5f13dfe09cfd0b1cbac821f5e27f6108)
`BPF_FUNC_skc_to_tcp_timewait_sock()` | 5.9 | | [`478cfbdf5f13`](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next/+/478cfbdf5f13dfe09cfd0b1cbac821f5e27f6108)
Expand Down Expand Up @@ -386,6 +394,10 @@ Helper | Kernel version | License | Commit |
`BPF_FUNC_task_storage_get()` | 5.11 | | [`4cf1bc1f1045`](https://github.com/torvalds/linux/commit/4cf1bc1f10452065a29d576fc5693fc4fab5b919)
`BPF_FUNC_tcp_check_syncookie()` | 5.2 | | [`399040847084`](https://kernel.googlesource.com/pub/scm/linux/kernel/git/davem/net-next/+/399040847084a69f345e0a52fd62f04654e0fce3)
`BPF_FUNC_tcp_gen_syncookie()` | 5.3 | | [`70d66244317e`](https://github.com/torvalds/linux/commit/70d66244317e958092e9c971b08dd5b7fd29d9cb#diff-05da4bf36c7fbcd176254e1615d98b28)
`BPF_FUNC_tcp_raw_check_syncookie_ipv4()` | 5.20 | | [`33bf9885040c`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit?id=33bf9885040c399cf6a95bd33216644126728e14)
`BPF_FUNC_tcp_raw_check_syncookie_ipv6()` | 5.20 | | [`33bf9885040c`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit?id=33bf9885040c399cf6a95bd33216644126728e14)
`BPF_FUNC_tcp_raw_gen_syncookie_ipv4()` | 5.20 | | [`33bf9885040c`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit?id=33bf9885040c399cf6a95bd33216644126728e14)
`BPF_FUNC_tcp_raw_gen_syncookie_ipv6()` | 5.20 | | [`33bf9885040c`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit?id=33bf9885040c399cf6a95bd33216644126728e14)
`BPF_FUNC_tcp_send_ack()` | 5.5 | | [`206057fe020a`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=206057fe020ac5c037d5e2dd6562a9bd216ec765)
`BPF_FUNC_tcp_sock()` | 5.1 | | [`655a51e536c0`](https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=655a51e536c09d15ffa3603b1b6fce2b45b85a1f)
`BPF_FUNC_this_cpu_ptr()` | 5.10 | | [`63d9b80dcf2c`](https://github.com/torvalds/linux/commit/63d9b80dcf2c67bc5ade61cbbaa09d7af21f43f1) |
Expand Down
182 changes: 178 additions & 4 deletions src/cc/compat/linux/virtual_bpf.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -999,6 +999,7 @@ enum bpf_attach_type {
BPF_SK_REUSEPORT_SELECT_OR_MIGRATE,
BPF_PERF_EVENT,
BPF_TRACE_KPROBE_MULTI,
BPF_LSM_CGROUP,
__MAX_BPF_ATTACH_TYPE
};

Expand Down Expand Up @@ -1432,6 +1433,7 @@ union bpf_attr {
__u32 attach_flags;
__aligned_u64 prog_ids;
__u32 prog_cnt;
__aligned_u64 prog_attach_flags; /* output: per-program attach_flags */
} query;

struct { /* anonymous struct used by BPF_RAW_TRACEPOINT_OPEN command */
Expand Down Expand Up @@ -3598,10 +3600,11 @@ union bpf_attr {
*
* *iph* points to the start of the IPv4 or IPv6 header, while
* *iph_len* contains **sizeof**\ (**struct iphdr**) or
* **sizeof**\ (**struct ip6hdr**).
* **sizeof**\ (**struct ipv6hdr**).
*
* *th* points to the start of the TCP header, while *th_len*
* contains **sizeof**\ (**struct tcphdr**).
* contains the length of the TCP header (at least
* **sizeof**\ (**struct tcphdr**)).
* Return
* 0 if *iph* and *th* are a valid SYN cookie ACK, or a negative
* error otherwise.
Expand Down Expand Up @@ -3784,10 +3787,11 @@ union bpf_attr {
*
* *iph* points to the start of the IPv4 or IPv6 header, while
* *iph_len* contains **sizeof**\ (**struct iphdr**) or
* **sizeof**\ (**struct ip6hdr**).
* **sizeof**\ (**struct ipv6hdr**).
*
* *th* points to the start of the TCP header, while *th_len*
* contains the length of the TCP header.
* contains the length of the TCP header with options (at least
* **sizeof**\ (**struct tcphdr**)).
* Return
* On success, lower 32 bits hold the generated SYN cookie in
* followed by 16 bits which hold the MSS value for that cookie,
Expand Down Expand Up @@ -5173,6 +5177,157 @@ union bpf_attr {
* Return
* Map value associated to *key* on *cpu*, or **NULL** if no entry
* was found or *cpu* is invalid.
*
* struct mptcp_sock *bpf_skc_to_mptcp_sock(void *sk)
* Description
* Dynamically cast a *sk* pointer to a *mptcp_sock* pointer.
* Return
* *sk* if casting is valid, or **NULL** otherwise.
*
* long bpf_dynptr_from_mem(void *data, u32 size, u64 flags, struct bpf_dynptr *ptr)
* Description
* Get a dynptr to local memory *data*.
*
* *data* must be a ptr to a map value.
* The maximum *size* supported is DYNPTR_MAX_SIZE.
* *flags* is currently unused.
* Return
* 0 on success, -E2BIG if the size exceeds DYNPTR_MAX_SIZE,
* -EINVAL if flags is not 0.
*
* long bpf_ringbuf_reserve_dynptr(void *ringbuf, u32 size, u64 flags, struct bpf_dynptr *ptr)
* Description
* Reserve *size* bytes of payload in a ring buffer *ringbuf*
* through the dynptr interface. *flags* must be 0.
*
* Please note that a corresponding bpf_ringbuf_submit_dynptr or
* bpf_ringbuf_discard_dynptr must be called on *ptr*, even if the
* reservation fails. This is enforced by the verifier.
* Return
* 0 on success, or a negative error in case of failure.
*
* void bpf_ringbuf_submit_dynptr(struct bpf_dynptr *ptr, u64 flags)
* Description
* Submit reserved ring buffer sample, pointed to by *data*,
* through the dynptr interface. This is a no-op if the dynptr is
* invalid/null.
*
* For more information on *flags*, please see
* 'bpf_ringbuf_submit'.
* Return
* Nothing. Always succeeds.
*
* void bpf_ringbuf_discard_dynptr(struct bpf_dynptr *ptr, u64 flags)
* Description
* Discard reserved ring buffer sample through the dynptr
* interface. This is a no-op if the dynptr is invalid/null.
*
* For more information on *flags*, please see
* 'bpf_ringbuf_discard'.
* Return
* Nothing. Always succeeds.
*
* long bpf_dynptr_read(void *dst, u32 len, struct bpf_dynptr *src, u32 offset)
* Description
* Read *len* bytes from *src* into *dst*, starting from *offset*
* into *src*.
* Return
* 0 on success, -E2BIG if *offset* + *len* exceeds the length
* of *src*'s data, -EINVAL if *src* is an invalid dynptr.
*
* long bpf_dynptr_write(struct bpf_dynptr *dst, u32 offset, void *src, u32 len)
* Description
* Write *len* bytes from *src* into *dst*, starting from *offset*
* into *dst*.
* Return
* 0 on success, -E2BIG if *offset* + *len* exceeds the length
* of *dst*'s data, -EINVAL if *dst* is an invalid dynptr or if *dst*
* is a read-only dynptr.
*
* void *bpf_dynptr_data(struct bpf_dynptr *ptr, u32 offset, u32 len)
* Description
* Get a pointer to the underlying dynptr data.
*
* *len* must be a statically known value. The returned data slice
* is invalidated whenever the dynptr is invalidated.
* Return
* Pointer to the underlying dynptr data, NULL if the dynptr is
* read-only, if the dynptr is invalid, or if the offset and length
* is out of bounds.
*
* s64 bpf_tcp_raw_gen_syncookie_ipv4(struct iphdr *iph, struct tcphdr *th, u32 th_len)
* Description
* Try to issue a SYN cookie for the packet with corresponding
* IPv4/TCP headers, *iph* and *th*, without depending on a
* listening socket.
*
* *iph* points to the IPv4 header.
*
* *th* points to the start of the TCP header, while *th_len*
* contains the length of the TCP header (at least
* **sizeof**\ (**struct tcphdr**)).
* Return
* On success, lower 32 bits hold the generated SYN cookie in
* followed by 16 bits which hold the MSS value for that cookie,
* and the top 16 bits are unused.
*
* On failure, the returned value is one of the following:
*
* **-EINVAL** if *th_len* is invalid.
*
* s64 bpf_tcp_raw_gen_syncookie_ipv6(struct ipv6hdr *iph, struct tcphdr *th, u32 th_len)
* Description
* Try to issue a SYN cookie for the packet with corresponding
* IPv6/TCP headers, *iph* and *th*, without depending on a
* listening socket.
*
* *iph* points to the IPv6 header.
*
* *th* points to the start of the TCP header, while *th_len*
* contains the length of the TCP header (at least
* **sizeof**\ (**struct tcphdr**)).
* Return
* On success, lower 32 bits hold the generated SYN cookie in
* followed by 16 bits which hold the MSS value for that cookie,
* and the top 16 bits are unused.
*
* On failure, the returned value is one of the following:
*
* **-EINVAL** if *th_len* is invalid.
*
* **-EPROTONOSUPPORT** if CONFIG_IPV6 is not builtin.
*
* long bpf_tcp_raw_check_syncookie_ipv4(struct iphdr *iph, struct tcphdr *th)
* Description
* Check whether *iph* and *th* contain a valid SYN cookie ACK
* without depending on a listening socket.
*
* *iph* points to the IPv4 header.
*
* *th* points to the TCP header.
* Return
* 0 if *iph* and *th* are a valid SYN cookie ACK.
*
* On failure, the returned value is one of the following:
*
* **-EACCES** if the SYN cookie is not valid.
*
* long bpf_tcp_raw_check_syncookie_ipv6(struct ipv6hdr *iph, struct tcphdr *th)
* Description
* Check whether *iph* and *th* contain a valid SYN cookie ACK
* without depending on a listening socket.
*
* *iph* points to the IPv6 header.
*
* *th* points to the TCP header.
* Return
* 0 if *iph* and *th* are a valid SYN cookie ACK.
*
* On failure, the returned value is one of the following:
*
* **-EACCES** if the SYN cookie is not valid.
*
* **-EPROTONOSUPPORT** if CONFIG_IPV6 is not builtin.
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
Expand Down Expand Up @@ -5371,6 +5526,18 @@ union bpf_attr {
FN(ima_file_hash), \
FN(kptr_xchg), \
FN(map_lookup_percpu_elem), \
FN(skc_to_mptcp_sock), \
FN(dynptr_from_mem), \
FN(ringbuf_reserve_dynptr), \
FN(ringbuf_submit_dynptr), \
FN(ringbuf_discard_dynptr), \
FN(dynptr_read), \
FN(dynptr_write), \
FN(dynptr_data), \
FN(tcp_raw_gen_syncookie_ipv4), \
FN(tcp_raw_gen_syncookie_ipv6), \
FN(tcp_raw_check_syncookie_ipv4), \
FN(tcp_raw_check_syncookie_ipv6), \
/* */

/* integer value in 'imm' field of BPF_CALL instruction selects which helper
Expand Down Expand Up @@ -5911,6 +6078,8 @@ struct bpf_prog_info {
__u64 run_cnt;
__u64 recursion_misses;
__u32 verified_insns;
__u32 attach_btf_obj_id;
__u32 attach_btf_id;
} __attribute__((aligned(8)));

struct bpf_map_info {
Expand Down Expand Up @@ -6522,6 +6691,11 @@ struct bpf_timer {
__u64 :64;
} __attribute__((aligned(8)));

struct bpf_dynptr {
__u64 :64;
__u64 :64;
} __attribute__((aligned(8)));

struct bpf_sysctl {
__u32 write; /* Sysctl is being read (= 0) or written (= 1).
* Allows 1,2,4-byte read, but no write.
Expand Down
34 changes: 34 additions & 0 deletions src/cc/export/helpers.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -989,6 +989,40 @@ static void *(*bpf_kptr_xchg)(void *map_value, void *ptr) = (void *)BPF_FUNC_kpt
static void *(*bpf_map_lookup_percpu_elem)(void *map, const void *key, __u32 cpu) =
(void *)BPF_FUNC_map_lookup_percpu_elem;

struct mptcp_sock;
struct bpf_dynptr;
struct iphdr;
struct ipv6hdr;
struct tcphdr;
static struct mptcp_sock *(*bpf_skc_to_mptcp_sock)(void *sk) =
(void *)BPF_FUNC_skc_to_mptcp_sock;
static long (*bpf_dynptr_from_mem)(void *data, __u32 size, __u64 flags,
struct bpf_dynptr *ptr) =
(void *)BPF_FUNC_dynptr_from_mem;
static long (*bpf_ringbuf_reserve_dynptr)(void *ringbuf, __u32 size, __u64 flags,
struct bpf_dynptr *ptr) =
(void *)BPF_FUNC_ringbuf_reserve_dynptr;
static void (*bpf_ringbuf_submit_dynptr)(struct bpf_dynptr *ptr, __u64 flags) =
(void *)BPF_FUNC_ringbuf_submit_dynptr;
static void (*bpf_ringbuf_discard_dynptr)(struct bpf_dynptr *ptr, __u64 flags) =
(void *)BPF_FUNC_ringbuf_discard_dynptr;
static long (*bpf_dynptr_read)(void *dst, __u32 len, struct bpf_dynptr *src, __u32 offset) =
(void *)BPF_FUNC_dynptr_read;
static long (*bpf_dynptr_write)(struct bpf_dynptr *dst, __u32 offset, void *src, __u32 len) =
(void *)BPF_FUNC_dynptr_write;
static void *(*bpf_dynptr_data)(struct bpf_dynptr *ptr, __u32 offset, __u32 len) =
(void *)BPF_FUNC_dynptr_data;
static __s64 (*bpf_tcp_raw_gen_syncookie_ipv4)(struct iphdr *iph, struct tcphdr *th,
__u32 th_len) =
(void *)BPF_FUNC_tcp_raw_gen_syncookie_ipv4;
static __s64 (*bpf_tcp_raw_gen_syncookie_ipv6)(struct ipv6hdr *iph, struct tcphdr *th,
__u32 th_len) =
(void *)BPF_FUNC_tcp_raw_gen_syncookie_ipv6;
static long (*bpf_tcp_raw_check_syncookie_ipv4)(struct iphdr *iph, struct tcphdr *th) =
(void *)BPF_FUNC_tcp_raw_check_syncookie_ipv4;
static long (*bpf_tcp_raw_check_syncookie_ipv6)(struct ipv6hdr *iph, struct tcphdr *th) =
(void *)BPF_FUNC_tcp_raw_check_syncookie_ipv6;

/* llvm builtin functions that eBPF C program may use to
* emit BPF_LD_ABS and BPF_LD_IND instructions
*/
Expand Down
12 changes: 12 additions & 0 deletions src/cc/libbpf.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -300,6 +300,18 @@ static struct bpf_helper helpers[] = {
{"ima_file_hash", "5.18"},
{"kptr_xchg", "5.19"},
{"map_lookup_percpu_elem", "5.19"},
{"skc_to_mptcp_sock", "5.19"},
{"dynptr_from_mem", "5.19"},
{"ringbuf_reserve_dynptr", "5.19"},
{"ringbuf_submit_dynptr", "5.19"},
{"ringbuf_discard_dynptr", "5.19"},
{"dynptr_read", "5.19"},
{"dynptr_write", "5.19"},
{"dynptr_data", "5.19"},
{"tcp_raw_gen_syncookie_ipv4", "5.20"},
{"tcp_raw_gen_syncookie_ipv6", "5.20"},
{"tcp_raw_check_syncookie_ipv4", "5.20"},
{"tcp_raw_check_syncookie_ipv6", "5.20"},
};

static uint64_t ptr_to_u64(void *ptr)
Expand Down

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