466 lines
12 KiB
C
466 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/if_vlan.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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#include <net/tc_wrapper.h>
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#include <linux/tc_act/tc_vlan.h>
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#include <net/tc_act/tc_vlan.h>
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static struct tc_action_ops act_vlan_ops;
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TC_INDIRECT_SCOPE int tcf_vlan_act(struct sk_buff *skb,
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const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_vlan *v = to_vlan(a);
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struct tcf_vlan_params *p;
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int action;
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int err;
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u16 tci;
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tcf_lastuse_update(&v->tcf_tm);
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tcf_action_update_bstats(&v->common, skb);
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/* Ensure 'data' points at mac_header prior calling vlan manipulating
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* functions.
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*/
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if (skb_at_tc_ingress(skb))
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skb_push_rcsum(skb, skb->mac_len);
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action = READ_ONCE(v->tcf_action);
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p = rcu_dereference_bh(v->vlan_p);
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switch (p->tcfv_action) {
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case TCA_VLAN_ACT_POP:
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err = skb_vlan_pop(skb);
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if (err)
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goto drop;
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break;
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case TCA_VLAN_ACT_PUSH:
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err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid |
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(p->tcfv_push_prio << VLAN_PRIO_SHIFT));
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if (err)
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goto drop;
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break;
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case TCA_VLAN_ACT_MODIFY:
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/* No-op if no vlan tag (either hw-accel or in-payload) */
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if (!skb_vlan_tagged(skb))
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goto out;
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/* extract existing tag (and guarantee no hw-accel tag) */
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if (skb_vlan_tag_present(skb)) {
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tci = skb_vlan_tag_get(skb);
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__vlan_hwaccel_clear_tag(skb);
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} else {
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/* in-payload vlan tag, pop it */
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err = __skb_vlan_pop(skb, &tci);
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if (err)
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goto drop;
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}
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/* replace the vid */
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tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid;
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/* replace prio bits, if tcfv_push_prio specified */
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if (p->tcfv_push_prio_exists) {
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tci &= ~VLAN_PRIO_MASK;
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tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT;
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}
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/* put updated tci as hwaccel tag */
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__vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci);
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break;
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case TCA_VLAN_ACT_POP_ETH:
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err = skb_eth_pop(skb);
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if (err)
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goto drop;
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break;
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case TCA_VLAN_ACT_PUSH_ETH:
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err = skb_eth_push(skb, p->tcfv_push_dst, p->tcfv_push_src);
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if (err)
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goto drop;
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break;
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default:
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BUG();
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}
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out:
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if (skb_at_tc_ingress(skb))
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skb_pull_rcsum(skb, skb->mac_len);
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return action;
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drop:
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tcf_action_inc_drop_qstats(&v->common);
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return TC_ACT_SHOT;
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}
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static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = {
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[TCA_VLAN_UNSPEC] = { .strict_start_type = TCA_VLAN_PUSH_ETH_DST },
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[TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) },
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[TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 },
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[TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 },
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[TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 },
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[TCA_VLAN_PUSH_ETH_DST] = NLA_POLICY_ETH_ADDR,
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[TCA_VLAN_PUSH_ETH_SRC] = NLA_POLICY_ETH_ADDR,
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};
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static int tcf_vlan_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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struct tcf_proto *tp, u32 flags,
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struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, act_vlan_ops.net_id);
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bool bind = flags & TCA_ACT_FLAGS_BIND;
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struct nlattr *tb[TCA_VLAN_MAX + 1];
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struct tcf_chain *goto_ch = NULL;
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bool push_prio_exists = false;
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struct tcf_vlan_params *p;
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struct tc_vlan *parm;
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struct tcf_vlan *v;
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int action;
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u16 push_vid = 0;
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__be16 push_proto = 0;
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u8 push_prio = 0;
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bool exists = false;
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int ret = 0, err;
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u32 index;
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if (!nla)
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return -EINVAL;
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err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
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NULL);
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if (err < 0)
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return err;
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if (!tb[TCA_VLAN_PARMS])
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return -EINVAL;
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parm = nla_data(tb[TCA_VLAN_PARMS]);
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index = parm->index;
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err = tcf_idr_check_alloc(tn, &index, a, bind);
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if (err < 0)
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return err;
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exists = err;
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if (exists && bind)
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return 0;
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switch (parm->v_action) {
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case TCA_VLAN_ACT_POP:
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break;
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case TCA_VLAN_ACT_PUSH:
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case TCA_VLAN_ACT_MODIFY:
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if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, index);
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return -EINVAL;
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}
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push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
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if (push_vid >= VLAN_VID_MASK) {
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, index);
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return -ERANGE;
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}
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if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
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push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
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switch (push_proto) {
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case htons(ETH_P_8021Q):
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case htons(ETH_P_8021AD):
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break;
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default:
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, index);
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return -EPROTONOSUPPORT;
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}
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} else {
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push_proto = htons(ETH_P_8021Q);
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}
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push_prio_exists = !!tb[TCA_VLAN_PUSH_VLAN_PRIORITY];
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if (push_prio_exists)
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push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
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break;
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case TCA_VLAN_ACT_POP_ETH:
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break;
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case TCA_VLAN_ACT_PUSH_ETH:
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if (!tb[TCA_VLAN_PUSH_ETH_DST] || !tb[TCA_VLAN_PUSH_ETH_SRC]) {
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, index);
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return -EINVAL;
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}
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break;
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default:
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if (exists)
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tcf_idr_release(*a, bind);
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else
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tcf_idr_cleanup(tn, index);
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return -EINVAL;
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}
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action = parm->v_action;
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if (!exists) {
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ret = tcf_idr_create_from_flags(tn, index, est, a,
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&act_vlan_ops, bind, flags);
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if (ret) {
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tcf_idr_cleanup(tn, index);
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return ret;
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}
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ret = ACT_P_CREATED;
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} else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
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tcf_idr_release(*a, bind);
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return -EEXIST;
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}
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
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if (err < 0)
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goto release_idr;
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v = to_vlan(*a);
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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if (!p) {
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err = -ENOMEM;
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goto put_chain;
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}
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p->tcfv_action = action;
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p->tcfv_push_vid = push_vid;
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p->tcfv_push_prio = push_prio;
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p->tcfv_push_prio_exists = push_prio_exists || action == TCA_VLAN_ACT_PUSH;
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p->tcfv_push_proto = push_proto;
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if (action == TCA_VLAN_ACT_PUSH_ETH) {
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nla_memcpy(&p->tcfv_push_dst, tb[TCA_VLAN_PUSH_ETH_DST],
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ETH_ALEN);
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nla_memcpy(&p->tcfv_push_src, tb[TCA_VLAN_PUSH_ETH_SRC],
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ETH_ALEN);
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}
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spin_lock_bh(&v->tcf_lock);
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
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p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
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spin_unlock_bh(&v->tcf_lock);
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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if (p)
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kfree_rcu(p, rcu);
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return ret;
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put_chain:
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if (goto_ch)
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tcf_chain_put_by_act(goto_ch);
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release_idr:
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tcf_idr_release(*a, bind);
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return err;
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}
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static void tcf_vlan_cleanup(struct tc_action *a)
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{
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struct tcf_vlan *v = to_vlan(a);
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struct tcf_vlan_params *p;
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p = rcu_dereference_protected(v->vlan_p, 1);
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if (p)
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kfree_rcu(p, rcu);
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}
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static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_vlan *v = to_vlan(a);
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struct tcf_vlan_params *p;
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struct tc_vlan opt = {
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.index = v->tcf_index,
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.refcnt = refcount_read(&v->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&v->tcf_bindcnt) - bind,
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};
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struct tcf_t t;
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spin_lock_bh(&v->tcf_lock);
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opt.action = v->tcf_action;
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p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
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opt.v_action = p->tcfv_action;
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if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
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p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
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(nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
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nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
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p->tcfv_push_proto) ||
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(p->tcfv_push_prio_exists &&
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nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, p->tcfv_push_prio))))
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goto nla_put_failure;
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if (p->tcfv_action == TCA_VLAN_ACT_PUSH_ETH) {
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if (nla_put(skb, TCA_VLAN_PUSH_ETH_DST, ETH_ALEN,
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p->tcfv_push_dst))
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goto nla_put_failure;
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if (nla_put(skb, TCA_VLAN_PUSH_ETH_SRC, ETH_ALEN,
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p->tcfv_push_src))
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goto nla_put_failure;
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}
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tcf_tm_dump(&t, &v->tcf_tm);
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if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
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goto nla_put_failure;
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spin_unlock_bh(&v->tcf_lock);
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return skb->len;
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nla_put_failure:
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spin_unlock_bh(&v->tcf_lock);
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nlmsg_trim(skb, b);
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return -1;
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}
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static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u64 packets,
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u64 drops, u64 lastuse, bool hw)
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{
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struct tcf_vlan *v = to_vlan(a);
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struct tcf_t *tm = &v->tcf_tm;
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tcf_action_update_stats(a, bytes, packets, drops, hw);
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tm->lastuse = max_t(u64, tm->lastuse, lastuse);
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}
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|
|
||
|
|
static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
|
||
|
|
{
|
||
|
|
return nla_total_size(sizeof(struct tc_vlan))
|
||
|
|
+ nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
|
||
|
|
+ nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
|
||
|
|
+ nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
|
||
|
|
}
|
||
|
|
|
||
|
|
static int tcf_vlan_offload_act_setup(struct tc_action *act, void *entry_data,
|
||
|
|
u32 *index_inc, bool bind,
|
||
|
|
struct netlink_ext_ack *extack)
|
||
|
|
{
|
||
|
|
if (bind) {
|
||
|
|
struct flow_action_entry *entry = entry_data;
|
||
|
|
|
||
|
|
switch (tcf_vlan_action(act)) {
|
||
|
|
case TCA_VLAN_ACT_PUSH:
|
||
|
|
entry->id = FLOW_ACTION_VLAN_PUSH;
|
||
|
|
entry->vlan.vid = tcf_vlan_push_vid(act);
|
||
|
|
entry->vlan.proto = tcf_vlan_push_proto(act);
|
||
|
|
entry->vlan.prio = tcf_vlan_push_prio(act);
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_POP:
|
||
|
|
entry->id = FLOW_ACTION_VLAN_POP;
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_MODIFY:
|
||
|
|
entry->id = FLOW_ACTION_VLAN_MANGLE;
|
||
|
|
entry->vlan.vid = tcf_vlan_push_vid(act);
|
||
|
|
entry->vlan.proto = tcf_vlan_push_proto(act);
|
||
|
|
entry->vlan.prio = tcf_vlan_push_prio(act);
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_POP_ETH:
|
||
|
|
entry->id = FLOW_ACTION_VLAN_POP_ETH;
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_PUSH_ETH:
|
||
|
|
entry->id = FLOW_ACTION_VLAN_PUSH_ETH;
|
||
|
|
tcf_vlan_push_eth(entry->vlan_push_eth.src, entry->vlan_push_eth.dst, act);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
NL_SET_ERR_MSG_MOD(extack, "Unsupported vlan action mode offload");
|
||
|
|
return -EOPNOTSUPP;
|
||
|
|
}
|
||
|
|
*index_inc = 1;
|
||
|
|
} else {
|
||
|
|
struct flow_offload_action *fl_action = entry_data;
|
||
|
|
|
||
|
|
switch (tcf_vlan_action(act)) {
|
||
|
|
case TCA_VLAN_ACT_PUSH:
|
||
|
|
fl_action->id = FLOW_ACTION_VLAN_PUSH;
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_POP:
|
||
|
|
fl_action->id = FLOW_ACTION_VLAN_POP;
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_MODIFY:
|
||
|
|
fl_action->id = FLOW_ACTION_VLAN_MANGLE;
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_POP_ETH:
|
||
|
|
fl_action->id = FLOW_ACTION_VLAN_POP_ETH;
|
||
|
|
break;
|
||
|
|
case TCA_VLAN_ACT_PUSH_ETH:
|
||
|
|
fl_action->id = FLOW_ACTION_VLAN_PUSH_ETH;
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EOPNOTSUPP;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct tc_action_ops act_vlan_ops = {
|
||
|
|
.kind = "vlan",
|
||
|
|
.id = TCA_ID_VLAN,
|
||
|
|
.owner = THIS_MODULE,
|
||
|
|
.act = tcf_vlan_act,
|
||
|
|
.dump = tcf_vlan_dump,
|
||
|
|
.init = tcf_vlan_init,
|
||
|
|
.cleanup = tcf_vlan_cleanup,
|
||
|
|
.stats_update = tcf_vlan_stats_update,
|
||
|
|
.get_fill_size = tcf_vlan_get_fill_size,
|
||
|
|
.offload_act_setup = tcf_vlan_offload_act_setup,
|
||
|
|
.size = sizeof(struct tcf_vlan),
|
||
|
|
};
|
||
|
|
|
||
|
|
static __net_init int vlan_init_net(struct net *net)
|
||
|
|
{
|
||
|
|
struct tc_action_net *tn = net_generic(net, act_vlan_ops.net_id);
|
||
|
|
|
||
|
|
return tc_action_net_init(net, tn, &act_vlan_ops);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __net_exit vlan_exit_net(struct list_head *net_list)
|
||
|
|
{
|
||
|
|
tc_action_net_exit(net_list, act_vlan_ops.net_id);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct pernet_operations vlan_net_ops = {
|
||
|
|
.init = vlan_init_net,
|
||
|
|
.exit_batch = vlan_exit_net,
|
||
|
|
.id = &act_vlan_ops.net_id,
|
||
|
|
.size = sizeof(struct tc_action_net),
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init vlan_init_module(void)
|
||
|
|
{
|
||
|
|
return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit vlan_cleanup_module(void)
|
||
|
|
{
|
||
|
|
tcf_unregister_action(&act_vlan_ops, &vlan_net_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");
|