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Commit bcad5718 authored Apr 03, 2015 by Daniel Borkmann Committed by David S. Miller Apr 03, 2015

ebpf: add skb->priority to offset map for usage in {cls, act}_bpf



This adds the ability to read out the skb->priority from an eBPF
program, so that it can be taken into account from a tc filter
or action for the use-case where the priority is not being used
to directly override the filter classification in a qdisc, but
to tag traffic otherwise for the classifier; the priority can be
assigned from various places incl. user space, in future we may
also mangle it from an eBPF program.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 2e7056c4

include/uapi/linux/bpf.h

+1 −0

Original line number	Original line	Diff line number	Diff line
	@@ -184,6 +184,7 @@ struct __sk_buff {
	__u32 vlan_present;		__u32 vlan_present;
	__u32 vlan_tci;		__u32 vlan_tci;
	__u32 vlan_proto;		__u32 vlan_proto;
			__u32 priority;
	};		};

	#endif /* _UAPI__LINUX_BPF_H__ */		#endif /* _UAPI__LINUX_BPF_H__ */

net/core/filter.c

+7 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1304,6 +1304,13 @@ static u32 sk_filter_convert_ctx_access(int dst_reg, int src_reg, int ctx_off,
	offsetof(struct sk_buff, vlan_proto));		offsetof(struct sk_buff, vlan_proto));
	break;		break;

			case offsetof(struct __sk_buff, priority):
			BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, priority) != 4);

			*insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
			offsetof(struct sk_buff, priority));
			break;

	case offsetof(struct __sk_buff, mark):		case offsetof(struct __sk_buff, mark):
	return convert_skb_access(SKF_AD_MARK, dst_reg, src_reg, insn);		return convert_skb_access(SKF_AD_MARK, dst_reg, src_reg, insn);