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Date: Mon, 23 Jul 2018 09:23:07 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, jhs@...atatu.com, xiyou.wangcong@...il.com,
jakub.kicinski@...ronome.com, simon.horman@...ronome.com,
john.hurley@...ronome.com, dsahern@...il.com, mlxsw@...lanox.com,
sridhar.samudrala@...el.com
Subject: [patch net-next v4 04/12] net: sched: introduce chain templates
From: Jiri Pirko <jiri@...lanox.com>
Allow user to set a template for newly created chains. Template lock
down the chain for particular classifier type/options combinations.
The classifier needs to support templates, otherwise kernel would
reply with error.
Signed-off-by: Jiri Pirko <jiri@...lanox.com>
---
v3->v4:
- only templates part as chains creation/deletion is now a separate patch
- don't pass template priv as arg of "change" op
---
include/net/sch_generic.h | 12 +++++++++
net/sched/cls_api.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 77 insertions(+)
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 81ec8276db9c..085c509c8674 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -238,6 +238,8 @@ struct tcf_result {
};
};
+struct tcf_chain;
+
struct tcf_proto_ops {
struct list_head head;
char kind[IFNAMSIZ];
@@ -263,10 +265,18 @@ struct tcf_proto_ops {
tc_setup_cb_t *cb, void *cb_priv,
struct netlink_ext_ack *extack);
void (*bind_class)(void *, u32, unsigned long);
+ void * (*tmplt_create)(struct net *net,
+ struct tcf_chain *chain,
+ struct nlattr **tca,
+ struct netlink_ext_ack *extack);
+ void (*tmplt_destroy)(void *tmplt_priv);
/* rtnetlink specific */
int (*dump)(struct net*, struct tcf_proto*, void *,
struct sk_buff *skb, struct tcmsg*);
+ int (*tmplt_dump)(struct sk_buff *skb,
+ struct net *net,
+ void *tmplt_priv);
struct module *owner;
};
@@ -305,6 +315,8 @@ struct tcf_chain {
u32 index; /* chain index */
unsigned int refcnt;
bool explicitly_created;
+ const struct tcf_proto_ops *tmplt_ops;
+ void *tmplt_priv;
};
struct tcf_block {
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index 5225fc557e69..fd85b57ecb10 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -298,10 +298,13 @@ struct tcf_chain *tcf_chain_get(struct tcf_block *block, u32 chain_index,
}
EXPORT_SYMBOL(tcf_chain_get);
+static void tc_chain_tmplt_del(struct tcf_chain *chain);
+
void tcf_chain_put(struct tcf_chain *chain)
{
if (--chain->refcnt == 0) {
tc_chain_notify(chain, NULL, 0, 0, RTM_DELCHAIN, false);
+ tc_chain_tmplt_del(chain);
tcf_chain_destroy(chain);
}
}
@@ -1258,6 +1261,12 @@ static int tc_new_tfilter(struct sk_buff *skb, struct nlmsghdr *n,
goto errout;
}
+ if (chain->tmplt_ops && chain->tmplt_ops != tp->ops) {
+ NL_SET_ERR_MSG(extack, "Chain template is set to a different filter kind");
+ err = -EINVAL;
+ goto errout;
+ }
+
err = tp->ops->change(net, skb, tp, cl, t->tcm_handle, tca, &fh,
n->nlmsg_flags & NLM_F_CREATE ? TCA_ACT_NOREPLACE : TCA_ACT_REPLACE,
extack);
@@ -1644,8 +1653,13 @@ static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net,
u32 portid, u32 seq, u16 flags, int event)
{
unsigned char *b = skb_tail_pointer(skb);
+ const struct tcf_proto_ops *ops;
struct nlmsghdr *nlh;
struct tcmsg *tcm;
+ void *priv;
+
+ ops = chain->tmplt_ops;
+ priv = chain->tmplt_priv;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*tcm), flags);
if (!nlh)
@@ -1666,6 +1680,13 @@ static int tc_chain_fill_node(struct tcf_chain *chain, struct net *net,
if (nla_put_u32(skb, TCA_CHAIN, chain->index))
goto nla_put_failure;
+ if (ops) {
+ if (nla_put_string(skb, TCA_KIND, ops->kind))
+ goto nla_put_failure;
+ if (ops->tmplt_dump(skb, net, priv) < 0)
+ goto nla_put_failure;
+ }
+
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
return skb->len;
@@ -1699,6 +1720,47 @@ static int tc_chain_notify(struct tcf_chain *chain, struct sk_buff *oskb,
return rtnetlink_send(skb, net, portid, RTNLGRP_TC, flags & NLM_F_ECHO);
}
+static int tc_chain_tmplt_add(struct tcf_chain *chain, struct net *net,
+ struct nlattr **tca,
+ struct netlink_ext_ack *extack)
+{
+ const struct tcf_proto_ops *ops;
+ void *tmplt_priv;
+
+ /* If kind is not set, user did not specify template. */
+ if (!tca[TCA_KIND])
+ return 0;
+
+ ops = tcf_proto_lookup_ops(nla_data(tca[TCA_KIND]), extack);
+ if (IS_ERR(ops))
+ return PTR_ERR(ops);
+ if (!ops->tmplt_create || !ops->tmplt_destroy || !ops->tmplt_dump) {
+ NL_SET_ERR_MSG(extack, "Chain templates are not supported with specified classifier");
+ return -EOPNOTSUPP;
+ }
+
+ tmplt_priv = ops->tmplt_create(net, chain, tca, extack);
+ if (IS_ERR(tmplt_priv)) {
+ module_put(ops->owner);
+ return PTR_ERR(tmplt_priv);
+ }
+ chain->tmplt_ops = ops;
+ chain->tmplt_priv = tmplt_priv;
+ return 0;
+}
+
+static void tc_chain_tmplt_del(struct tcf_chain *chain)
+{
+ const struct tcf_proto_ops *ops = chain->tmplt_ops;
+
+ /* If template ops are set, no work to do for us. */
+ if (!ops)
+ return;
+
+ ops->tmplt_destroy(chain->tmplt_priv);
+ module_put(ops->owner);
+}
+
/* Add/delete/get a chain */
static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
@@ -1763,6 +1825,9 @@ static int tc_ctl_chain(struct sk_buff *skb, struct nlmsghdr *n,
switch (n->nlmsg_type) {
case RTM_NEWCHAIN:
+ err = tc_chain_tmplt_add(chain, net, tca, extack);
+ if (err)
+ goto errout;
/* In case the chain was successfully added, take a reference
* to the chain. This ensures that an empty chain
* does not disappear at the end of this function.
--
2.14.4
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