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bpf: Add hardware timestamp field to __sk_buff 

BPF programs may want to know hardware timestamps if NIC supports
such timestamping.

Expose this data as hwtstamp field of __sk_buff the same way as
gso_segs/gso_size. This field could be accessed from the same
programs as tstamp field, but it's read-only field. Explicit test
to deny access to padding data is added to bpf_skb_is_valid_access.

Also update BPF_PROG_TEST_RUN tests of the feature.

Signed-off-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210909220409.8804-2-vfedorenko@novek.ru
This commit is contained in:
Vadim Fedorenko 2021-09-10 01:04:08 +03:00 committed by Daniel Borkmann
parent e876a0367c
commit f64c4acea5
3 changed files with 25 additions and 0 deletions
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2
include/uapi/linux/bpf.h
View File

@ -5284,6 +5284,8 @@ struct __sk_buff {
__u32 gso_segs;
__bpf_md_ptr(struct bpf_sock *, sk);
__u32 gso_size;
__u32 :32; /* Padding, future use. */
__u64 hwtstamp;
};
struct bpf_tunnel_key {

21
net/core/filter.c
View File

@ -7765,6 +7765,10 @@ static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type
break;
case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
return false;
case bpf_ctx_range(struct __sk_buff, hwtstamp):
if (type == BPF_WRITE || size != sizeof(__u64))
return false;
break;
case bpf_ctx_range(struct __sk_buff, tstamp):
if (size != sizeof(__u64))
return false;
@ -7774,6 +7778,9 @@ static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type
return false;
info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL;
break;
case offsetofend(struct __sk_buff, gso_size) ... offsetof(struct __sk_buff, hwtstamp) - 1:
/* Explicitly prohibit access to padding in __sk_buff. */
return false;
default:
/* Only narrow read access allowed for now. */
if (type == BPF_WRITE) {
@ -7802,6 +7809,7 @@ static bool sk_filter_is_valid_access(int off, int size,
case bpf_ctx_range_till(struct __sk_buff, family, local_port):
case bpf_ctx_range(struct __sk_buff, tstamp):
case bpf_ctx_range(struct __sk_buff, wire_len):
case bpf_ctx_range(struct __sk_buff, hwtstamp):
return false;
}
@ -7872,6 +7880,7 @@ static bool lwt_is_valid_access(int off, int size,
case bpf_ctx_range(struct __sk_buff, data_meta):
case bpf_ctx_range(struct __sk_buff, tstamp):
case bpf_ctx_range(struct __sk_buff, wire_len):
case bpf_ctx_range(struct __sk_buff, hwtstamp):
return false;
}
@ -8373,6 +8382,7 @@ static bool sk_skb_is_valid_access(int off, int size,
case bpf_ctx_range(struct __sk_buff, data_meta):
case bpf_ctx_range(struct __sk_buff, tstamp):
case bpf_ctx_range(struct __sk_buff, wire_len):
case bpf_ctx_range(struct __sk_buff, hwtstamp):
return false;
}
@ -8884,6 +8894,17 @@ static u32 bpf_convert_ctx_access(enum bpf_access_type type,
si->dst_reg, si->src_reg,
offsetof(struct sk_buff, sk));
break;
case offsetof(struct __sk_buff, hwtstamp):
BUILD_BUG_ON(sizeof_field(struct skb_shared_hwtstamps, hwtstamp) != 8);
BUILD_BUG_ON(offsetof(struct skb_shared_hwtstamps, hwtstamp) != 0);
insn = bpf_convert_shinfo_access(si, insn);
*insn++ = BPF_LDX_MEM(BPF_DW,
si->dst_reg, si->dst_reg,
bpf_target_off(struct skb_shared_info,
hwtstamps, 8,
target_size));
break;
}
return insn - insn_buf;

2
tools/include/uapi/linux/bpf.h
View File

@ -5284,6 +5284,8 @@ struct __sk_buff {
__u32 gso_segs;
__bpf_md_ptr(struct bpf_sock *, sk);
__u32 gso_size;
__u32 :32; /* Padding, future use. */
__u64 hwtstamp;
};
struct bpf_tunnel_key {