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bpf: Add source ip in "struct bpf_tunnel_key"

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Add tunnel source ip field in "struct bpf_tunnel_key". Add related code
to set and get tunnel source field.

Signed-off-by: Kaixi Fan <fankaixi.li@bytedance.com>
Link: https://lore.kernel.org/r/20220430074844.69214-2-fankaixi.li@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kaixi Fan 2022-04-30 15:48:42 +08:00 • committed by Alexei Starovoitov
parent bd2331b375
commit 26101f5ab6
3 changed files with 17 additions and 0 deletions
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4
include/uapi/linux/bpf.h
View file

@ -5604,6 +5604,10 @@ struct bpf_tunnel_key {
__u8 tunnel_ttl;
__u16 tunnel_ext; /* Padding, future use. */
__u32 tunnel_label;
union {
__u32 local_ipv4;
__u32 local_ipv6[4];
};
};
/* user accessible mirror of in-kernel xfrm_state.

9
net/core/filter.c
View file

@ -4498,6 +4498,7 @@ BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key
if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
err = -EINVAL;
switch (size) {
case offsetof(struct bpf_tunnel_key, local_ipv6[0]):
case offsetof(struct bpf_tunnel_key, tunnel_label):
case offsetof(struct bpf_tunnel_key, tunnel_ext):
goto set_compat;
@ -4523,10 +4524,14 @@ set_compat:
if (flags & BPF_F_TUNINFO_IPV6) {
memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
sizeof(to->remote_ipv6));
memcpy(to->local_ipv6, &info->key.u.ipv6.dst,
sizeof(to->local_ipv6));
to->tunnel_label = be32_to_cpu(info->key.label);
} else {
to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
to->local_ipv4 = be32_to_cpu(info->key.u.ipv4.dst);
memset(&to->local_ipv6[1], 0, sizeof(__u32) * 3);
to->tunnel_label = 0;
}
@ -4597,6 +4602,7 @@ BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
return -EINVAL;
if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
switch (size) {
case offsetof(struct bpf_tunnel_key, local_ipv6[0]):
case offsetof(struct bpf_tunnel_key, tunnel_label):
case offsetof(struct bpf_tunnel_key, tunnel_ext):
case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
@ -4639,10 +4645,13 @@ BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
info->mode |= IP_TUNNEL_INFO_IPV6;
memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
sizeof(from->remote_ipv6));
memcpy(&info->key.u.ipv6.src, from->local_ipv6,
sizeof(from->local_ipv6));
info->key.label = cpu_to_be32(from->tunnel_label) &
IPV6_FLOWLABEL_MASK;
} else {
info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
info->key.u.ipv4.src = cpu_to_be32(from->local_ipv4);
}
return 0;

4
tools/include/uapi/linux/bpf.h
View file

@ -5604,6 +5604,10 @@ struct bpf_tunnel_key {
__u8 tunnel_ttl;
__u16 tunnel_ext; /* Padding, future use. */
__u32 tunnel_label;
union {
__u32 local_ipv4;
__u32 local_ipv6[4];
};
};
/* user accessible mirror of in-kernel xfrm_state.