[ Upstream commit ead7f9b8de65632ef8060b84b0c55049a33cfea1 ] [ Note: Fixed conflict due to unrelated comment change. ]
In Cilium, we use bpf_csum_diff + bpf_l4_csum_replace to, among other things, update the L4 checksum after reverse SNATing IPv6 packets. That use case is however not currently supported and leads to invalid skb->csum values in some cases. This patch adds support for IPv6 address changes in bpf_l4_csum_update via a new flag.
When calling bpf_l4_csum_replace in Cilium, it ends up calling inet_proto_csum_replace_by_diff:
1: void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb, 2: __wsum diff, bool pseudohdr) 3: { 4: if (skb->ip_summed != CHECKSUM_PARTIAL) { 5: csum_replace_by_diff(sum, diff); 6: if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr) 7: skb->csum = ~csum_sub(diff, skb->csum); 8: } else if (pseudohdr) { 9: *sum = ~csum_fold(csum_add(diff, csum_unfold(*sum))); 10: } 11: }
The bug happens when we're in the CHECKSUM_COMPLETE state. We've just updated one of the IPv6 addresses. The helper now updates the L4 header checksum on line 5. Next, it updates skb->csum on line 7. It shouldn't.
For an IPv6 packet, the updates of the IPv6 address and of the L4 checksum will cancel each other. The checksums are set such that computing a checksum over the packet including its checksum will result in a sum of 0. So the same is true here when we update the L4 checksum on line 5. We'll update it as to cancel the previous IPv6 address update. Hence skb->csum should remain untouched in this case.
The same bug doesn't affect IPv4 packets because, in that case, three fields are updated: the IPv4 address, the IP checksum, and the L4 checksum. The change to the IPv4 address and one of the checksums still cancel each other in skb->csum, but we're left with one checksum update and should therefore update skb->csum accordingly. That's exactly what inet_proto_csum_replace_by_diff does.
This special case for IPv6 L4 checksums is also described atop inet_proto_csum_replace16, the function we should be using in this case.
This patch introduces a new bpf_l4_csum_replace flag, BPF_F_IPV6, to indicate that we're updating the L4 checksum of an IPv6 packet. When the flag is set, inet_proto_csum_replace_by_diff will skip the skb->csum update.
Fixes: 7d672345ed295 ("bpf: add generic bpf_csum_diff helper") Signed-off-by: Paul Chaignon paul.chaignon@gmail.com Acked-by: Daniel Borkmann daniel@iogearbox.net Link: https://patch.msgid.link/96a6bc3a443e6f0b21ff7b7834000e17fb549e05.1748509484... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Paul Chaignon paul.chaignon@gmail.com --- include/uapi/linux/bpf.h | 2 ++ net/core/filter.c | 5 +++-- tools/include/uapi/linux/bpf.h | 2 ++ 3 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 0bdeeabbc5a8..2ac62d5ed466 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -1695,6 +1695,7 @@ union bpf_attr { * for updates resulting in a null checksum the value is set to * **CSUM_MANGLED_0** instead. Flag **BPF_F_PSEUDO_HDR** indicates * the checksum is to be computed against a pseudo-header. + * Flag **BPF_F_IPV6** should be set for IPv6 packets. * * This helper works in combination with **bpf_csum_diff**\ (), * which does not update the checksum in-place, but offers more @@ -5106,6 +5107,7 @@ enum { BPF_F_PSEUDO_HDR = (1ULL << 4), BPF_F_MARK_MANGLED_0 = (1ULL << 5), BPF_F_MARK_ENFORCE = (1ULL << 6), + BPF_F_IPV6 = (1ULL << 7), };
/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ diff --git a/net/core/filter.c b/net/core/filter.c index 65b7fb9c3d29..169d9ba4e7a0 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -1951,10 +1951,11 @@ BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, bool is_pseudo = flags & BPF_F_PSEUDO_HDR; bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; bool do_mforce = flags & BPF_F_MARK_ENFORCE; + bool is_ipv6 = flags & BPF_F_IPV6; __sum16 *ptr;
if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | - BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) + BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK | BPF_F_IPV6))) return -EINVAL; if (unlikely(offset > 0xffff || offset & 1)) return -EFAULT; @@ -1970,7 +1971,7 @@ BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, if (unlikely(from != 0)) return -EINVAL;
- inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo, false); + inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo, is_ipv6); break; case 2: inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 54b8c899d21c..fe70f9ce8b00 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -1695,6 +1695,7 @@ union bpf_attr { * for updates resulting in a null checksum the value is set to * **CSUM_MANGLED_0** instead. Flag **BPF_F_PSEUDO_HDR** indicates * the checksum is to be computed against a pseudo-header. + * Flag **BPF_F_IPV6** should be set for IPv6 packets. * * This helper works in combination with **bpf_csum_diff**\ (), * which does not update the checksum in-place, but offers more @@ -5106,6 +5107,7 @@ enum { BPF_F_PSEUDO_HDR = (1ULL << 4), BPF_F_MARK_MANGLED_0 = (1ULL << 5), BPF_F_MARK_ENFORCE = (1ULL << 6), + BPF_F_IPV6 = (1ULL << 7), };
/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */