bpf: introduce new bpf AF_XDP map type BPF_MAP_TYPE_XSKMAP
The xskmap is yet another BPF map, very much inspired by dev/cpu/sockmap, and is a holder of AF_XDP sockets. A user application adds AF_XDP sockets into the map, and by using the bpf_redirect_map helper, an XDP program can redirect XDP frames to an AF_XDP socket. Note that a socket that is bound to certain ifindex/queue index will *only* accept XDP frames from that netdev/queue index. If an XDP program tries to redirect from a netdev/queue index other than what the socket is bound to, the frame will not be received on the socket. A socket can reside in multiple maps. v3: Fixed race and simplified code. v2: Removed one indirection in map lookup. Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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committed by
Alexei Starovoitov

parent
c497176cb2
commit
fbfc504a24
@@ -676,6 +676,31 @@ static inline int sock_map_prog(struct bpf_map *map,
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}
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#endif
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#if defined(CONFIG_XDP_SOCKETS)
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struct xdp_sock;
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struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map, u32 key);
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int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
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struct xdp_sock *xs);
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void __xsk_map_flush(struct bpf_map *map);
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#else
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struct xdp_sock;
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static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
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u32 key)
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{
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return NULL;
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}
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static inline int __xsk_map_redirect(struct bpf_map *map, struct xdp_buff *xdp,
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struct xdp_sock *xs)
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{
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return -EOPNOTSUPP;
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}
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static inline void __xsk_map_flush(struct bpf_map *map)
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{
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}
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#endif
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/* verifier prototypes for helper functions called from eBPF programs */
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extern const struct bpf_func_proto bpf_map_lookup_elem_proto;
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extern const struct bpf_func_proto bpf_map_update_elem_proto;
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