Helper function bpf_dynptr_data
Definition
Copyright (c) 2015 The Libbpf Authors. All rights reserved.
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.
skb and xdp type dynptrs may not use bpf_dynptr_data. They should instead use bpf_dynptr_slice and bpf_dynptr_slice_rdwr.
Returns
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.
static void *(* const bpf_dynptr_data)(const struct bpf_dynptr *ptr, __u32 offset, __u32 len) = (void *) 203;
Usage
Docs could be improved
This part of the docs is incomplete, contributions are very welcome
Program types
This helper call can be used in the following program types:
BPF_PROG_TYPE_CGROUP_DEVICEBPF_PROG_TYPE_CGROUP_SKBBPF_PROG_TYPE_CGROUP_SOCKBPF_PROG_TYPE_CGROUP_SOCKOPTBPF_PROG_TYPE_CGROUP_SOCK_ADDRBPF_PROG_TYPE_CGROUP_SYSCTLBPF_PROG_TYPE_FLOW_DISSECTORBPF_PROG_TYPE_KPROBEBPF_PROG_TYPE_LSMBPF_PROG_TYPE_LWT_INBPF_PROG_TYPE_LWT_OUTBPF_PROG_TYPE_LWT_SEG6LOCALBPF_PROG_TYPE_LWT_XMITBPF_PROG_TYPE_NETFILTERBPF_PROG_TYPE_PERF_EVENTBPF_PROG_TYPE_RAW_TRACEPOINTBPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLEBPF_PROG_TYPE_SCHED_ACTBPF_PROG_TYPE_SCHED_CLSBPF_PROG_TYPE_SK_LOOKUPBPF_PROG_TYPE_SK_MSGBPF_PROG_TYPE_SK_REUSEPORTBPF_PROG_TYPE_SK_SKBBPF_PROG_TYPE_SOCKET_FILTERBPF_PROG_TYPE_SOCK_OPSBPF_PROG_TYPE_STRUCT_OPSBPF_PROG_TYPE_SYSCALLBPF_PROG_TYPE_TRACEPOINTBPF_PROG_TYPE_TRACINGBPF_PROG_TYPE_XDP
Example
Docs could be improved
This part of the docs is incomplete, contributions are very welcome