| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us> |
| */ |
| |
| #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 <net/pkt_cls.h> |
| |
| #include <linux/tc_act/tc_vlan.h> |
| #include <net/tc_act/tc_vlan.h> |
| |
| static unsigned int vlan_net_id; |
| static struct tc_action_ops act_vlan_ops; |
| |
| static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a, |
| struct tcf_result *res) |
| { |
| struct tcf_vlan *v = to_vlan(a); |
| struct tcf_vlan_params *p; |
| int action; |
| int err; |
| u16 tci; |
| |
| tcf_lastuse_update(&v->tcf_tm); |
| bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb); |
| |
| /* Ensure 'data' points at mac_header prior calling vlan manipulating |
| * functions. |
| */ |
| if (skb_at_tc_ingress(skb)) |
| skb_push_rcsum(skb, skb->mac_len); |
| |
| action = READ_ONCE(v->tcf_action); |
| |
| p = rcu_dereference_bh(v->vlan_p); |
| |
| switch (p->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, p->tcfv_push_proto, p->tcfv_push_vid | |
| (p->tcfv_push_prio << VLAN_PRIO_SHIFT)); |
| if (err) |
| goto drop; |
| break; |
| case TCA_VLAN_ACT_MODIFY: |
| /* No-op if no vlan tag (either hw-accel or in-payload) */ |
| if (!skb_vlan_tagged(skb)) |
| goto out; |
| /* extract existing tag (and guarantee no hw-accel tag) */ |
| if (skb_vlan_tag_present(skb)) { |
| tci = skb_vlan_tag_get(skb); |
| __vlan_hwaccel_clear_tag(skb); |
| } else { |
| /* in-payload vlan tag, pop it */ |
| err = __skb_vlan_pop(skb, &tci); |
| if (err) |
| goto drop; |
| } |
| /* replace the vid */ |
| tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid; |
| /* replace prio bits, if tcfv_push_prio specified */ |
| if (p->tcfv_push_prio) { |
| tci &= ~VLAN_PRIO_MASK; |
| tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT; |
| } |
| /* put updated tci as hwaccel tag */ |
| __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci); |
| break; |
| default: |
| BUG(); |
| } |
| |
| out: |
| if (skb_at_tc_ingress(skb)) |
| skb_pull_rcsum(skb, skb->mac_len); |
| |
| return action; |
| |
| drop: |
| qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats)); |
| return TC_ACT_SHOT; |
| } |
| |
| 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 }, |
| [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 }, |
| }; |
| |
| static int tcf_vlan_init(struct net *net, struct nlattr *nla, |
| struct nlattr *est, struct tc_action **a, |
| int ovr, int bind, bool rtnl_held, |
| struct tcf_proto *tp, struct netlink_ext_ack *extack) |
| { |
| struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| struct nlattr *tb[TCA_VLAN_MAX + 1]; |
| struct tcf_chain *goto_ch = NULL; |
| struct tcf_vlan_params *p; |
| struct tc_vlan *parm; |
| struct tcf_vlan *v; |
| int action; |
| u16 push_vid = 0; |
| __be16 push_proto = 0; |
| u8 push_prio = 0; |
| bool exists = false; |
| int ret = 0, err; |
| u32 index; |
| |
| if (!nla) |
| return -EINVAL; |
| |
| err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy, |
| NULL); |
| if (err < 0) |
| return err; |
| |
| if (!tb[TCA_VLAN_PARMS]) |
| return -EINVAL; |
| parm = nla_data(tb[TCA_VLAN_PARMS]); |
| index = parm->index; |
| err = tcf_idr_check_alloc(tn, &index, a, bind); |
| if (err < 0) |
| return err; |
| exists = err; |
| if (exists && bind) |
| return 0; |
| |
| switch (parm->v_action) { |
| case TCA_VLAN_ACT_POP: |
| break; |
| case TCA_VLAN_ACT_PUSH: |
| case TCA_VLAN_ACT_MODIFY: |
| if (!tb[TCA_VLAN_PUSH_VLAN_ID]) { |
| if (exists) |
| tcf_idr_release(*a, bind); |
| else |
| tcf_idr_cleanup(tn, index); |
| return -EINVAL; |
| } |
| push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]); |
| if (push_vid >= VLAN_VID_MASK) { |
| if (exists) |
| tcf_idr_release(*a, bind); |
| else |
| tcf_idr_cleanup(tn, index); |
| 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: |
| if (exists) |
| tcf_idr_release(*a, bind); |
| else |
| tcf_idr_cleanup(tn, index); |
| return -EPROTONOSUPPORT; |
| } |
| } else { |
| push_proto = htons(ETH_P_8021Q); |
| } |
| |
| if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) |
| push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); |
| break; |
| default: |
| if (exists) |
| tcf_idr_release(*a, bind); |
| else |
| tcf_idr_cleanup(tn, index); |
| return -EINVAL; |
| } |
| action = parm->v_action; |
| |
| if (!exists) { |
| ret = tcf_idr_create(tn, index, est, a, |
| &act_vlan_ops, bind, true); |
| if (ret) { |
| tcf_idr_cleanup(tn, index); |
| return ret; |
| } |
| |
| ret = ACT_P_CREATED; |
| } else if (!ovr) { |
| tcf_idr_release(*a, bind); |
| return -EEXIST; |
| } |
| |
| err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
| if (err < 0) |
| goto release_idr; |
| |
| v = to_vlan(*a); |
| |
| p = kzalloc(sizeof(*p), GFP_KERNEL); |
| if (!p) { |
| err = -ENOMEM; |
| goto put_chain; |
| } |
| |
| p->tcfv_action = action; |
| p->tcfv_push_vid = push_vid; |
| p->tcfv_push_prio = push_prio; |
| p->tcfv_push_proto = push_proto; |
| |
| spin_lock_bh(&v->tcf_lock); |
| goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
| rcu_swap_protected(v->vlan_p, p, lockdep_is_held(&v->tcf_lock)); |
| spin_unlock_bh(&v->tcf_lock); |
| |
| if (goto_ch) |
| tcf_chain_put_by_act(goto_ch); |
| if (p) |
| kfree_rcu(p, rcu); |
| |
| if (ret == ACT_P_CREATED) |
| tcf_idr_insert(tn, *a); |
| return ret; |
| put_chain: |
| if (goto_ch) |
| tcf_chain_put_by_act(goto_ch); |
| release_idr: |
| tcf_idr_release(*a, bind); |
| return err; |
| } |
| |
| static void tcf_vlan_cleanup(struct tc_action *a) |
| { |
| struct tcf_vlan *v = to_vlan(a); |
| struct tcf_vlan_params *p; |
| |
| p = rcu_dereference_protected(v->vlan_p, 1); |
| if (p) |
| kfree_rcu(p, rcu); |
| } |
| |
| 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 = to_vlan(a); |
| struct tcf_vlan_params *p; |
| struct tc_vlan opt = { |
| .index = v->tcf_index, |
| .refcnt = refcount_read(&v->tcf_refcnt) - ref, |
| .bindcnt = atomic_read(&v->tcf_bindcnt) - bind, |
| }; |
| struct tcf_t t; |
| |
| spin_lock_bh(&v->tcf_lock); |
| opt.action = v->tcf_action; |
| p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock)); |
| opt.v_action = p->tcfv_action; |
| if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt)) |
| goto nla_put_failure; |
| |
| if ((p->tcfv_action == TCA_VLAN_ACT_PUSH || |
| p->tcfv_action == TCA_VLAN_ACT_MODIFY) && |
| (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) || |
| nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, |
| p->tcfv_push_proto) || |
| (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, |
| p->tcfv_push_prio)))) |
| goto nla_put_failure; |
| |
| tcf_tm_dump(&t, &v->tcf_tm); |
| if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD)) |
| goto nla_put_failure; |
| spin_unlock_bh(&v->tcf_lock); |
| |
| return skb->len; |
| |
| nla_put_failure: |
| spin_unlock_bh(&v->tcf_lock); |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| static int tcf_vlan_walker(struct net *net, struct sk_buff *skb, |
| struct netlink_callback *cb, int type, |
| const struct tc_action_ops *ops, |
| struct netlink_ext_ack *extack) |
| { |
| struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| |
| return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
| } |
| |
| static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index) |
| { |
| struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| |
| return tcf_idr_search(tn, a, index); |
| } |
| |
| 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 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, |
| .walk = tcf_vlan_walker, |
| .get_fill_size = tcf_vlan_get_fill_size, |
| .lookup = tcf_vlan_search, |
| .size = sizeof(struct tcf_vlan), |
| }; |
| |
| static __net_init int vlan_init_net(struct net *net) |
| { |
| struct tc_action_net *tn = net_generic(net, vlan_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, vlan_net_id); |
| } |
| |
| static struct pernet_operations vlan_net_ops = { |
| .init = vlan_init_net, |
| .exit_batch = vlan_exit_net, |
| .id = &vlan_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"); |