diff options
| author |   Daniel Borkmann <daniel@iogearbox.net> | 2015-09-30 01:41:51 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-10-03 05:02:41 -0700 |
| commit | c46646d0484f5d08e2bede9b45034ba5b8b489cc (patch) | |
| tree | b15b5132baba1198decf5966819dea7cdb7d2cfc /include | |
| parent | ebpf: migrate bpf_prog's flags to bitfield (diff) | |
| download | linux-dev-c46646d0484f5d08e2bede9b45034ba5b8b489cc.tar.xz linux-dev-c46646d0484f5d08e2bede9b45034ba5b8b489cc.zip | |
sched, bpf: add helper for retrieving routing realms
Using routing realms as part of the classifier is quite useful, it
can be viewed as a tag for one or multiple routing entries (think of
an analogy to net_cls cgroup for processes), set by user space routing
daemons or via iproute2 as an indicator for traffic classifiers and
later on processed in the eBPF program.
Unlike actions, the classifier can inspect device flags and enable
netif_keep_dst() if necessary. tc actions don't have that possibility,
but in case people know what they are doing, it can be used from there
as well (e.g. via devs that must keep dsts by design anyway).
If a realm is set, the handler returns the non-zero realm. User space
can set the full 32bit realm for the dst.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/filter.h | 3 | ||||
| -rw-r--r-- | include/uapi/linux/bpf.h | 7 |
2 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/filter.h b/include/linux/filter.h index bad618f316d7..3d5fd24b321b 100644 --- a/include/linux/filter.h +++ b/include/linux/filter.h @@ -328,7 +328,8 @@ struct bpf_prog { u16 pages; /* Number of allocated pages */ kmemcheck_bitfield_begin(meta); u16 jited:1, /* Is our filter JIT'ed? */ - gpl_compatible:1; /* Is filter GPL compatible? */ + gpl_compatible:1, /* Is filter GPL compatible? */ + dst_needed:1; /* Do we need dst entry? */ kmemcheck_bitfield_end(meta); u32 len; /* Number of filter blocks */ enum bpf_prog_type type; /* Type of BPF program */ diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 4ec0b5488294..564f1f091991 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -280,6 +280,13 @@ enum bpf_func_id { * Return: TC_ACT_REDIRECT */ BPF_FUNC_redirect, + + /** + * bpf_get_route_realm(skb) - retrieve a dst's tclassid + * @skb: pointer to skb + * Return: realm if != 0 + */ + BPF_FUNC_get_route_realm, __BPF_FUNC_MAX_ID, }; |