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bpf: sync bpf.h to tools/ 

Sync updated documentation for bpf_redirect_map.

Sync the bpf_tcp_gen_syncookie helper function definition with the one
in tools/uapi.

Signed-off-by: Petar Penkov <ppenkov@google.com>
Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Petar Penkov 2019-07-29 09:59:16 -07:00 committed by Alexei Starovoitov
parent 70d6624431
commit 3745ee1801
1 changed files with 34 additions and 3 deletions
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37
tools/include/uapi/linux/bpf.h
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@ -1572,8 +1572,11 @@ union bpf_attr {
* but this is only implemented for native XDP (with driver
* support) as of this writing).
*
* All values for *flags* are reserved for future usage, and must
* be left at zero.
* The lower two bits of *flags* are used as the return code if
* the map lookup fails. This is so that the return value can be
* one of the XDP program return codes up to XDP_TX, as chosen by
* the caller. Any higher bits in the *flags* argument must be
* unset.
*
* When used to redirect packets to net devices, this helper
* provides a high performance increase over **bpf_redirect**\ ().
@ -2711,6 +2714,33 @@ union bpf_attr {
* **-EPERM** if no permission to send the *sig*.
*
* **-EAGAIN** if bpf program can try again.
*
* s64 bpf_tcp_gen_syncookie(struct bpf_sock *sk, void *iph, u32 iph_len, struct tcphdr *th, u32 th_len)
* Description
* Try to issue a SYN cookie for the packet with corresponding
* IP/TCP headers, *iph* and *th*, on the listening socket in *sk*.
*
* *iph* points to the start of the IPv4 or IPv6 header, while
* *iph_len* contains **sizeof**\ (**struct iphdr**) or
* **sizeof**\ (**struct ip6hdr**).
*
* *th* points to the start of the TCP header, while *th_len*
* contains the length of the TCP header.
*
* 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** SYN cookie cannot be issued due to error
*
* **-ENOENT** SYN cookie should not be issued (no SYN flood)
*
* **-EOPNOTSUPP** kernel configuration does not enable SYN cookies
*
* **-EPROTONOSUPPORT** IP packet version is not 4 or 6
*/
#define __BPF_FUNC_MAPPER(FN) \
FN(unspec), \
@ -2822,7 +2852,8 @@ union bpf_attr {
FN(strtoul), \
FN(sk_storage_get), \
FN(sk_storage_delete), \
FN(send_signal),
FN(send_signal), \
FN(tcp_gen_syncookie),
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
* function eBPF program intends to call