sched: introduce vlan action

This tc action allows to work with vlan tagged skbs. Two supported
sub-actions are header pop and header push.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/tc_act/tc_vlan.h b/include/net/tc_act/tc_vlan.h
new file mode 100644 (file)
index 0000000..c809c1d
--- /dev/null
+++ b/include/net/tc_act/tc_vlan.h
@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __NET_TC_VLAN_H
+#define __NET_TC_VLAN_H
+
+#include <net/act_api.h>
+
+#define VLAN_F_POP             0x1
+#define VLAN_F_PUSH            0x2
+
+struct tcf_vlan {
+       struct tcf_common       common;
+       int                     tcfv_action;
+       __be16                  tcfv_push_vid;
+       __be16                  tcfv_push_proto;
+};
+#define to_vlan(a) \
+       container_of(a->priv, struct tcf_vlan, common)
+
+#endif /* __NET_TC_VLAN_H */

diff --git a/include/uapi/linux/tc_act/tc_vlan.h b/include/uapi/linux/tc_act/tc_vlan.h
new file mode 100644 (file)
index 0000000..f7b8d44
--- /dev/null
+++ b/include/uapi/linux/tc_act/tc_vlan.h
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __LINUX_TC_VLAN_H
+#define __LINUX_TC_VLAN_H
+
+#include <linux/pkt_cls.h>
+
+#define TCA_ACT_VLAN 12
+
+#define TCA_VLAN_ACT_POP       1
+#define TCA_VLAN_ACT_PUSH      2
+
+struct tc_vlan {
+       tc_gen;
+       int v_action;
+};
+
+enum {
+       TCA_VLAN_UNSPEC,
+       TCA_VLAN_TM,
+       TCA_VLAN_PARMS,
+       TCA_VLAN_PUSH_VLAN_ID,
+       TCA_VLAN_PUSH_VLAN_PROTOCOL,
+       __TCA_VLAN_MAX,
+};
+#define TCA_VLAN_MAX (__TCA_VLAN_MAX - 1)
+
+#endif

diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index a1a8e29..88618f8 100644 (file)
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -686,6 +686,17 @@ config NET_ACT_CSUM
          To compile this code as a module, choose M here: the
          module will be called act_csum.
 
+config NET_ACT_VLAN
+        tristate "Vlan manipulation"
+        depends on NET_CLS_ACT
+        ---help---
+         Say Y here to push or pop vlan headers.
+
+         If unsure, say N.
+
+         To compile this code as a module, choose M here: the
+         module will be called act_vlan.
+
 config NET_CLS_IND
        bool "Incoming device classification"
        depends on NET_CLS_U32 || NET_CLS_FW

diff --git a/net/sched/Makefile b/net/sched/Makefile
index 0a869a1..679f24a 100644 (file)
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_NET_ACT_PEDIT)   += act_pedit.o
 obj-$(CONFIG_NET_ACT_SIMP)     += act_simple.o
 obj-$(CONFIG_NET_ACT_SKBEDIT)  += act_skbedit.o
 obj-$(CONFIG_NET_ACT_CSUM)     += act_csum.o
+obj-$(CONFIG_NET_ACT_VLAN)     += act_vlan.o
 obj-$(CONFIG_NET_SCH_FIFO)     += sch_fifo.o
 obj-$(CONFIG_NET_SCH_CBQ)      += sch_cbq.o
 obj-$(CONFIG_NET_SCH_HTB)      += sch_htb.o

diff --git a/net/sched/act_vlan.c b/net/sched/act_vlan.c
new file mode 100644 (file)
index 0000000..d735ecf
--- /dev/null
+++ b/net/sched/act_vlan.c
@@ -0,0 +1,207 @@
+/*
+ * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/if_vlan.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+
+#include <linux/tc_act/tc_vlan.h>
+#include <net/tc_act/tc_vlan.h>
+
+#define VLAN_TAB_MASK     15
+
+static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a,
+                   struct tcf_result *res)
+{
+       struct tcf_vlan *v = a->priv;
+       int action;
+       int err;
+
+       spin_lock(&v->tcf_lock);
+       v->tcf_tm.lastuse = jiffies;
+       bstats_update(&v->tcf_bstats, skb);
+       action = v->tcf_action;
+
+       switch (v->tcfv_action) {
+       case TCA_VLAN_ACT_POP:
+               err = skb_vlan_pop(skb);
+               if (err)
+                       goto drop;
+               break;
+       case TCA_VLAN_ACT_PUSH:
+               err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid);
+               if (err)
+                       goto drop;
+               break;
+       default:
+               BUG();
+       }
+
+       goto unlock;
+
+drop:
+       action = TC_ACT_SHOT;
+       v->tcf_qstats.drops++;
+unlock:
+       spin_unlock(&v->tcf_lock);
+       return action;
+}
+
+static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
+       [TCA_VLAN_PARMS]                = { .len = sizeof(struct tc_vlan) },
+       [TCA_VLAN_PUSH_VLAN_ID]         = { .type = NLA_U16 },
+       [TCA_VLAN_PUSH_VLAN_PROTOCOL]   = { .type = NLA_U16 },
+};
+
+static int tcf_vlan_init(struct net *net, struct nlattr *nla,
+                        struct nlattr *est, struct tc_action *a,
+                        int ovr, int bind)
+{
+       struct nlattr *tb[TCA_VLAN_MAX + 1];
+       struct tc_vlan *parm;
+       struct tcf_vlan *v;
+       int action;
+       __be16 push_vid = 0;
+       __be16 push_proto = 0;
+       int ret = 0;
+       int err;
+
+       if (!nla)
+               return -EINVAL;
+
+       err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy);
+       if (err < 0)
+               return err;
+
+       if (!tb[TCA_VLAN_PARMS])
+               return -EINVAL;
+       parm = nla_data(tb[TCA_VLAN_PARMS]);
+       switch (parm->v_action) {
+       case TCA_VLAN_ACT_POP:
+               break;
+       case TCA_VLAN_ACT_PUSH:
+               if (!tb[TCA_VLAN_PUSH_VLAN_ID])
+                       return -EINVAL;
+               push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
+               if (push_vid >= VLAN_VID_MASK)
+                       return -ERANGE;
+
+               if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
+                       push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
+                       switch (push_proto) {
+                       case htons(ETH_P_8021Q):
+                       case htons(ETH_P_8021AD):
+                               break;
+                       default:
+                               return -EPROTONOSUPPORT;
+                       }
+               } else {
+                       push_proto = htons(ETH_P_8021Q);
+               }
+               break;
+       default:
+               return -EINVAL;
+       }
+       action = parm->v_action;
+
+       if (!tcf_hash_check(parm->index, a, bind)) {
+               ret = tcf_hash_create(parm->index, est, a, sizeof(*v), bind);
+               if (ret)
+                       return ret;
+
+               ret = ACT_P_CREATED;
+       } else {
+               if (bind)
+                       return 0;
+               tcf_hash_release(a, bind);
+               if (!ovr)
+                       return -EEXIST;
+       }
+
+       v = to_vlan(a);
+
+       spin_lock_bh(&v->tcf_lock);
+
+       v->tcfv_action = action;
+       v->tcfv_push_vid = push_vid;
+       v->tcfv_push_proto = push_proto;
+
+       v->tcf_action = parm->action;
+
+       spin_unlock_bh(&v->tcf_lock);
+
+       if (ret == ACT_P_CREATED)
+               tcf_hash_insert(a);
+       return ret;
+}
+
+static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
+                        int bind, int ref)
+{
+       unsigned char *b = skb_tail_pointer(skb);
+       struct tcf_vlan *v = a->priv;
+       struct tc_vlan opt = {
+               .index    = v->tcf_index,
+               .refcnt   = v->tcf_refcnt - ref,
+               .bindcnt  = v->tcf_bindcnt - bind,
+               .action   = v->tcf_action,
+               .v_action = v->tcfv_action,
+       };
+       struct tcf_t t;
+
+       if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
+               goto nla_put_failure;
+
+       if (v->tcfv_action == TCA_VLAN_ACT_PUSH &&
+           (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) ||
+            nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, v->tcfv_push_proto)))
+               goto nla_put_failure;
+
+       t.install = jiffies_to_clock_t(jiffies - v->tcf_tm.install);
+       t.lastuse = jiffies_to_clock_t(jiffies - v->tcf_tm.lastuse);
+       t.expires = jiffies_to_clock_t(v->tcf_tm.expires);
+       if (nla_put(skb, TCA_VLAN_TM, sizeof(t), &t))
+               goto nla_put_failure;
+       return skb->len;
+
+nla_put_failure:
+       nlmsg_trim(skb, b);
+       return -1;
+}
+
+static struct tc_action_ops act_vlan_ops = {
+       .kind           =       "vlan",
+       .type           =       TCA_ACT_VLAN,
+       .owner          =       THIS_MODULE,
+       .act            =       tcf_vlan,
+       .dump           =       tcf_vlan_dump,
+       .init           =       tcf_vlan_init,
+};
+
+static int __init vlan_init_module(void)
+{
+       return tcf_register_action(&act_vlan_ops, VLAN_TAB_MASK);
+}
+
+static void __exit vlan_cleanup_module(void)
+{
+       tcf_unregister_action(&act_vlan_ops);
+}
+
+module_init(vlan_init_module);
+module_exit(vlan_cleanup_module);
+
+MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
+MODULE_DESCRIPTION("vlan manipulation actions");
+MODULE_LICENSE("GPL v2");