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Date: Fri, 13 Jul 2018 11:55:01 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: netdev@...r.kernel.org
Cc: Jamal Hadi Salim <jhs@...atatu.com>,
Cong Wang <xiyou.wangcong@...il.com>,
Jiri Pirko <jiri@...nulli.us>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Subject: [PATCH net-next 3/4] net/sched: refactor TC_ACT_REDIRECT handling
This patch changes the TC_ACT_REDIRECT code path to allow
providing the redirect parameters via the tcf_result argument.
Such union is expanded to host the redirect device, the redirect
direction (ingress/egress) and the stats to be updated on error
conditions.
Actions/classifiers using TC_ACT_REDIRECT can either:
* fill the tcf_result redirect related fields
* clear such fields and use the bpf per cpu redirect info
skb_do_redirect now tries to fetch the relevant data from tcf_result
and fall back to access redirect info. It also updates the stats
accordingly to the redirect result, if provided by the caller.
This will allow using the TC_ACT_REDIRECT action in more places in
the next patch.
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
include/net/sch_generic.h | 15 ++++++++++++++-
net/core/dev.c | 4 ++--
net/core/filter.c | 29 +++++++++++++++++++++++------
net/core/lwt_bpf.c | 5 ++++-
net/sched/act_bpf.c | 4 +++-
net/sched/cls_bpf.c | 8 +++++---
6 files changed, 51 insertions(+), 14 deletions(-)
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 056dc1083aa3..dd9e00d017b3 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -235,9 +235,22 @@ struct tcf_result {
u32 classid;
};
const struct tcf_proto *goto_tp;
+
+ /* used by the TC_ACT_REDIRECT action */
+ struct {
+ /* device and direction, or 0 bpf redirect */
+ long dev_ingress;
+ struct gnet_stats_queue *qstats;
+ };
};
};
+#define TCF_RESULT_REDIR_DEV(res) \
+ ((struct net_device *)((res)->dev_ingress & ~1))
+#define TCF_RESULT_REDIR_INGRESS(res) ((res)->dev_ingress & 1)
+#define TCF_RESULT_SET_REDIRECT(res, dev, ingress) \
+ ((res)->dev_ingress = (long)(dev) | (!!(ingress)))
+
struct tcf_proto_ops {
struct list_head head;
char kind[IFNAMSIZ];
@@ -543,7 +556,7 @@ struct Qdisc *qdisc_create_dflt(struct netdev_queue *dev_queue,
struct netlink_ext_ack *extack);
void __qdisc_calculate_pkt_len(struct sk_buff *skb,
const struct qdisc_size_table *stab);
-int skb_do_redirect(struct sk_buff *);
+int skb_do_redirect(struct sk_buff *skb, struct tcf_result *res);
static inline void skb_reset_tc(struct sk_buff *skb)
{
diff --git a/net/core/dev.c b/net/core/dev.c
index 14a748ee8cc9..a283dbfde30c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3538,7 +3538,7 @@ sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
return NULL;
case TC_ACT_REDIRECT:
/* No need to push/pop skb's mac_header here on egress! */
- skb_do_redirect(skb);
+ skb_do_redirect(skb, &cl_res);
*ret = NET_XMIT_SUCCESS;
return NULL;
default:
@@ -4600,7 +4600,7 @@ sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
* redirecting to another netdev
*/
__skb_push(skb, skb->mac_len);
- skb_do_redirect(skb);
+ skb_do_redirect(skb, &cl_res);
return NULL;
default:
break;
diff --git a/net/core/filter.c b/net/core/filter.c
index b9ec916f4e3a..4f64cf5189e6 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -2062,19 +2062,36 @@ BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
return TC_ACT_REDIRECT;
}
-int skb_do_redirect(struct sk_buff *skb)
+int skb_do_redirect(struct sk_buff *skb, struct tcf_result *res)
{
- struct redirect_info *ri = this_cpu_ptr(&redirect_info);
+ struct gnet_stats_queue *stats;
struct net_device *dev;
+ int ret, flags;
- dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex);
- ri->ifindex = 0;
+ if (!res->dev_ingress) {
+ struct redirect_info *ri = this_cpu_ptr(&redirect_info);
+
+ dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->ifindex);
+ flags = ri->flags;
+ ri->ifindex = 0;
+ stats = NULL;
+ } else {
+ dev = TCF_RESULT_REDIR_DEV(res);
+ flags = TCF_RESULT_REDIR_INGRESS(res) ? BPF_F_INGRESS : 0;
+ stats = res->qstats;
+ }
if (unlikely(!dev)) {
kfree_skb(skb);
- return -EINVAL;
+ ret = -EINVAL;
+ goto out;
}
- return __bpf_redirect(skb, dev, ri->flags);
+ ret = __bpf_redirect(skb, dev, flags);
+
+out:
+ if (ret && stats)
+ qstats_overlimit_inc(res->qstats);
+ return ret;
}
static const struct bpf_func_proto bpf_redirect_proto = {
diff --git a/net/core/lwt_bpf.c b/net/core/lwt_bpf.c
index e7e626fb87bb..8dde1093994a 100644
--- a/net/core/lwt_bpf.c
+++ b/net/core/lwt_bpf.c
@@ -65,7 +65,10 @@ static int run_lwt_bpf(struct sk_buff *skb, struct bpf_lwt_prog *lwt,
lwt->name ? : "<unknown>");
ret = BPF_OK;
} else {
- ret = skb_do_redirect(skb);
+ struct tcf_result res;
+
+ res.dev_ingress = 0;
+ ret = skb_do_redirect(skb, &res);
if (ret == 0)
ret = BPF_REDIRECT;
}
diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c
index ac20266460c0..6fd46b691181 100644
--- a/net/sched/act_bpf.c
+++ b/net/sched/act_bpf.c
@@ -67,10 +67,12 @@ static int tcf_bpf(struct sk_buff *skb, const struct tc_action *act,
* returned.
*/
switch (filter_res) {
+ case TC_ACT_REDIRECT:
+ res->dev_ingress = 0;
+ /* fall-through */
case TC_ACT_PIPE:
case TC_ACT_RECLASSIFY:
case TC_ACT_OK:
- case TC_ACT_REDIRECT:
action = filter_res;
break;
case TC_ACT_SHOT:
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 66e0ac9811f9..f0fb7ded8fe2 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -65,14 +65,16 @@ static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
.len = sizeof(struct sock_filter) * BPF_MAXINSNS },
};
-static int cls_bpf_exec_opcode(int code)
+static int cls_bpf_exec_opcode(int code, struct tcf_result *res)
{
switch (code) {
+ case TC_ACT_REDIRECT:
+ res->dev_ingress = 0;
+ /* fall-through */
case TC_ACT_OK:
case TC_ACT_SHOT:
case TC_ACT_STOLEN:
case TC_ACT_TRAP:
- case TC_ACT_REDIRECT:
case TC_ACT_UNSPEC:
return code;
default:
@@ -113,7 +115,7 @@ static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
res->classid = TC_H_MAJ(prog->res.classid) |
qdisc_skb_cb(skb)->tc_classid;
- ret = cls_bpf_exec_opcode(filter_res);
+ ret = cls_bpf_exec_opcode(filter_res, res);
if (ret == TC_ACT_UNSPEC)
continue;
break;
--
2.17.1
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