BPF Built-in Functions (Using the GNU Compiler Collection (GCC))

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6.60.12 BPF Built-in Functions ¶

The following built-in functions are available for eBPF targets.

Built-in Function: unsigned long long __builtin_bpf_load_byte (unsigned long long offset) ¶: Load a byte from the struct sk_buff packet data pointed by the register %r6 and return it.

Built-in Function: unsigned long long __builtin_bpf_load_half (unsigned long long offset) ¶: Load 16-bits from the struct sk_buff packet data pointed by the register %r6 and return it.

Built-in Function: unsigned long long __builtin_bpf_load_word (unsigned long long offset) ¶: Load 32-bits from the struct sk_buff packet data pointed by the register %r6 and return it.