![Thomas Graf](/assets/img/avatar_default.png)
Registers new BPF program types which correspond to the LWT hooks: - BPF_PROG_TYPE_LWT_IN => dst_input() - BPF_PROG_TYPE_LWT_OUT => dst_output() - BPF_PROG_TYPE_LWT_XMIT => lwtunnel_xmit() The separate program types are required to differentiate between the capabilities each LWT hook allows: * Programs attached to dst_input() or dst_output() are restricted and may only read the data of an skb. This prevent modification and possible invalidation of already validated packet headers on receive and the construction of illegal headers while the IP headers are still being assembled. * Programs attached to lwtunnel_xmit() are allowed to modify packet content as well as prepending an L2 header via a newly introduced helper bpf_skb_change_head(). This is safe as lwtunnel_xmit() is invoked after the IP header has been assembled completely. All BPF programs receive an skb with L3 headers attached and may return one of the following error codes: BPF_OK - Continue routing as per nexthop BPF_DROP - Drop skb and return EPERM BPF_REDIRECT - Redirect skb to device as per redirect() helper. (Only valid in lwtunnel_xmit() context) The return codes are binary compatible with their TC_ACT_ relatives to ease compatibility. Signed-off-by: Thomas Graf <tgraf@suug.ch> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
70 lines
1.2 KiB
C
70 lines
1.2 KiB
C
#ifndef _UAPI_LWTUNNEL_H_
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#define _UAPI_LWTUNNEL_H_
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#include <linux/types.h>
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enum lwtunnel_encap_types {
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LWTUNNEL_ENCAP_NONE,
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LWTUNNEL_ENCAP_MPLS,
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LWTUNNEL_ENCAP_IP,
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LWTUNNEL_ENCAP_ILA,
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LWTUNNEL_ENCAP_IP6,
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LWTUNNEL_ENCAP_SEG6,
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LWTUNNEL_ENCAP_BPF,
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__LWTUNNEL_ENCAP_MAX,
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};
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#define LWTUNNEL_ENCAP_MAX (__LWTUNNEL_ENCAP_MAX - 1)
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enum lwtunnel_ip_t {
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LWTUNNEL_IP_UNSPEC,
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LWTUNNEL_IP_ID,
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LWTUNNEL_IP_DST,
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LWTUNNEL_IP_SRC,
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LWTUNNEL_IP_TTL,
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LWTUNNEL_IP_TOS,
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LWTUNNEL_IP_FLAGS,
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LWTUNNEL_IP_PAD,
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__LWTUNNEL_IP_MAX,
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};
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#define LWTUNNEL_IP_MAX (__LWTUNNEL_IP_MAX - 1)
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enum lwtunnel_ip6_t {
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LWTUNNEL_IP6_UNSPEC,
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LWTUNNEL_IP6_ID,
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LWTUNNEL_IP6_DST,
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LWTUNNEL_IP6_SRC,
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LWTUNNEL_IP6_HOPLIMIT,
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LWTUNNEL_IP6_TC,
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LWTUNNEL_IP6_FLAGS,
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LWTUNNEL_IP6_PAD,
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__LWTUNNEL_IP6_MAX,
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};
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#define LWTUNNEL_IP6_MAX (__LWTUNNEL_IP6_MAX - 1)
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enum {
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LWT_BPF_PROG_UNSPEC,
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LWT_BPF_PROG_FD,
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LWT_BPF_PROG_NAME,
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__LWT_BPF_PROG_MAX,
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};
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#define LWT_BPF_PROG_MAX (__LWT_BPF_PROG_MAX - 1)
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enum {
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LWT_BPF_UNSPEC,
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LWT_BPF_IN,
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LWT_BPF_OUT,
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LWT_BPF_XMIT,
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LWT_BPF_XMIT_HEADROOM,
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__LWT_BPF_MAX,
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};
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#define LWT_BPF_MAX (__LWT_BPF_MAX - 1)
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#define LWT_BPF_MAX_HEADROOM 256
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#endif /* _UAPI_LWTUNNEL_H_ */
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