[PATCH v3 1/6] bpf: add new prog type for cgroup socket filtering
From: Daniel Mack <daniel@zonque.org>
Date: 2016-08-26 19:59:01
Subsystem:
bpf [core], bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), networking [general], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, Martin KaFai Lau, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
For now, this program type is equivalent to BPF_PROG_TYPE_SOCKET_FILTER in terms of checks during the verification process. It may access the skb as well. Programs of this type will be attached to cgroups for network filtering and accounting. Signed-off-by: Daniel Mack <daniel@zonque.org> --- include/uapi/linux/bpf.h | 7 +++++++ kernel/bpf/verifier.c | 1 + net/core/filter.c | 6 ++++++ 3 files changed, 14 insertions(+)
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index e4c5a1b..1d5db42 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h@@ -95,6 +95,13 @@ enum bpf_prog_type { BPF_PROG_TYPE_SCHED_ACT, BPF_PROG_TYPE_TRACEPOINT, BPF_PROG_TYPE_XDP, + BPF_PROG_TYPE_CGROUP_SOCKET_FILTER, +}; + +enum bpf_attach_type { + BPF_ATTACH_TYPE_CGROUP_INET_INGRESS, + BPF_ATTACH_TYPE_CGROUP_INET_EGRESS, + __MAX_BPF_ATTACH_TYPE }; #define BPF_PSEUDO_MAP_FD 1
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index abb61f3..12ca880 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c@@ -1805,6 +1805,7 @@ static bool may_access_skb(enum bpf_prog_type type) case BPF_PROG_TYPE_SOCKET_FILTER: case BPF_PROG_TYPE_SCHED_CLS: case BPF_PROG_TYPE_SCHED_ACT: + case BPF_PROG_TYPE_CGROUP_SOCKET_FILTER: return true; default: return false;
diff --git a/net/core/filter.c b/net/core/filter.c
index a83766b..bc04e5c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -2848,12 +2848,18 @@ static struct bpf_prog_type_list xdp_type __read_mostly = { .type = BPF_PROG_TYPE_XDP, }; +static struct bpf_prog_type_list cg_sk_filter_type __read_mostly = { + .ops = &sk_filter_ops, + .type = BPF_PROG_TYPE_CGROUP_SOCKET_FILTER, +}; + static int __init register_sk_filter_ops(void) { bpf_register_prog_type(&sk_filter_type); bpf_register_prog_type(&sched_cls_type); bpf_register_prog_type(&sched_act_type); bpf_register_prog_type(&xdp_type); + bpf_register_prog_type(&cg_sk_filter_type); return 0; }
--
2.5.5