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c7272ca720
Now that we made the BPF loader generic as a library, reuse it for loading XDP programs as well. This basically adds a minimal start of a facility for iproute2 to load XDP programs. There currently only exists the xdp1_user.c sample code in the kernel tree that sets up netlink directly and an iovisor/bcc front-end. Since we have all the necessary infrastructure in place already from tc side, we can just reuse its loader back-end and thus facilitate migration and usability among the two for people familiar with tc/bpf already. Sharing maps, performing tail calls, etc works the same way as with tc. Naturally, once kernel configuration API evolves, we will extend new features for XDP here as well, resp. extend dumping of related netlink attributes. Minimal example: clang -target bpf -O2 -Wall -c prog.c -o prog.o ip [-force] link set dev em1 xdp obj prog.o # attaching ip [-d] link # dumping ip link set dev em1 xdp off # detaching For the dump, intention is that in the first line for each ip link entry, we'll see "xdp" to indicate that this device has an XDP program attached. Once we dump some more useful information via netlink (digest, etc), idea is that 'ip -d link' will then display additional relevant program information below the "link/ ether [...]" output line for such devices, for example. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org>
42 lines
929 B
C
42 lines
929 B
C
#ifndef __BPF_ELF__
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#define __BPF_ELF__
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#include <asm/types.h>
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/* Note:
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*
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* Below ELF section names and bpf_elf_map structure definition
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* are not (!) kernel ABI. It's rather a "contract" between the
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* application and the BPF loader in tc. For compatibility, the
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* section names should stay as-is. Introduction of aliases, if
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* needed, are a possibility, though.
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*/
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/* ELF section names, etc */
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#define ELF_SECTION_LICENSE "license"
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#define ELF_SECTION_MAPS "maps"
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#define ELF_SECTION_PROG "prog"
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#define ELF_SECTION_CLASSIFIER "classifier"
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#define ELF_SECTION_ACTION "action"
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#define ELF_MAX_MAPS 64
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#define ELF_MAX_LICENSE_LEN 128
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/* Object pinning settings */
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#define PIN_NONE 0
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#define PIN_OBJECT_NS 1
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#define PIN_GLOBAL_NS 2
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/* ELF map definition */
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struct bpf_elf_map {
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__u32 type;
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__u32 size_key;
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__u32 size_value;
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__u32 max_elem;
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__u32 flags;
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__u32 id;
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__u32 pinning;
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};
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#endif /* __BPF_ELF__ */
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