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authorDaniel Borkmann <daniel@iogearbox.net>2015-04-03 20:52:24 +0200
committerDavid S. Miller <davem@davemloft.net>2015-04-03 14:59:15 -0400
commitbcad57182425426dd4aa14deb27f97acb329f3cd (patch)
treed534fef01490769c56a9246f9cf07dd681f0ecbe /net
parent2e7056c433216f406b90a003aa0ba42e19d3bdcf (diff)
downloadlinux-bcad57182425426dd4aa14deb27f97acb329f3cd.tar.bz2
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>
Diffstat (limited to 'net')
-rw-r--r--net/core/filter.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index 444a07e4f68d..955a7d77decd 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -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));
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):
return convert_skb_access(SKF_AD_MARK, dst_reg, src_reg, insn);