summaryrefslogtreecommitdiffstats
path: root/net/core
diff options
context:
space:
mode:
authorDaniel Mack <daniel@zonque.org>2016-11-23 16:52:25 +0100
committerDavid S. Miller <davem@davemloft.net>2016-11-25 16:25:52 -0500
commit0e33661de493db325435d565a4a722120ae4cbf3 (patch)
treed8f41dacce4f7c1d5305ad962a6407941ef1d9d5 /net/core
parent619228d86b0e32e00758dcf07ca5d06903d9a9d7 (diff)
downloadlinux-0e33661de493db325435d565a4a722120ae4cbf3.tar.gz
linux-0e33661de493db325435d565a4a722120ae4cbf3.tar.bz2
linux-0e33661de493db325435d565a4a722120ae4cbf3.zip
bpf: add new prog type for cgroup socket filtering
This program type is similar to BPF_PROG_TYPE_SOCKET_FILTER, except that it does not allow BPF_LD_[ABS|IND] instructions and hooks up the bpf_skb_load_bytes() helper. Programs of this type will be attached to cgroups for network filtering and accounting. Signed-off-by: Daniel Mack <daniel@zonque.org> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/filter.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index dece94fef005..2de302d68038 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2630,6 +2630,17 @@ xdp_func_proto(enum bpf_func_id func_id)
}
}
+static const struct bpf_func_proto *
+cg_skb_func_proto(enum bpf_func_id func_id)
+{
+ switch (func_id) {
+ case BPF_FUNC_skb_load_bytes:
+ return &bpf_skb_load_bytes_proto;
+ default:
+ return sk_filter_func_proto(func_id);
+ }
+}
+
static bool __is_valid_access(int off, int size, enum bpf_access_type type)
{
if (off < 0 || off >= sizeof(struct __sk_buff))
@@ -2992,6 +3003,12 @@ static const struct bpf_verifier_ops xdp_ops = {
.convert_ctx_access = xdp_convert_ctx_access,
};
+static const struct bpf_verifier_ops cg_skb_ops = {
+ .get_func_proto = cg_skb_func_proto,
+ .is_valid_access = sk_filter_is_valid_access,
+ .convert_ctx_access = sk_filter_convert_ctx_access,
+};
+
static struct bpf_prog_type_list sk_filter_type __read_mostly = {
.ops = &sk_filter_ops,
.type = BPF_PROG_TYPE_SOCKET_FILTER,
@@ -3012,12 +3029,18 @@ static struct bpf_prog_type_list xdp_type __read_mostly = {
.type = BPF_PROG_TYPE_XDP,
};
+static struct bpf_prog_type_list cg_skb_type __read_mostly = {
+ .ops = &cg_skb_ops,
+ .type = BPF_PROG_TYPE_CGROUP_SKB,
+};
+
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_skb_type);
return 0;
}