/* * 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 unsigned int vlan_net_id; static struct tc_action_ops act_vlan_ops; static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_vlan *v = to_vlan(a); int action; int err; u16 tci; spin_lock(&v->tcf_lock); tcf_lastuse_update(&v->tcf_tm); bstats_update(&v->tcf_bstats, skb); action = v->tcf_action; /* Ensure 'data' points at mac_header prior calling vlan manipulating * functions. */ if (skb_at_tc_ingress(skb)) skb_push_rcsum(skb, skb->mac_len); 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 | (v->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 unlock; /* extract existing tag (and guarantee no hw-accel tag) */ if (skb_vlan_tag_present(skb)) { tci = skb_vlan_tag_get(skb); skb->vlan_tci = 0; } 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) | v->tcfv_push_vid; /* replace prio bits, if tcfv_push_prio specified */ if (v->tcfv_push_prio) { tci &= ~VLAN_PRIO_MASK; tci |= v->tcfv_push_prio << VLAN_PRIO_SHIFT; } /* put updated tci as hwaccel tag */ __vlan_hwaccel_put_tag(skb, v->tcfv_push_proto, tci); break; default: BUG(); } goto unlock; drop: action = TC_ACT_SHOT; v->tcf_qstats.drops++; unlock: if (skb_at_tc_ingress(skb)) skb_pull_rcsum(skb, skb->mac_len); 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 }, [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) { struct tc_action_net *tn = net_generic(net, vlan_net_id); 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; u8 push_prio = 0; bool exists = false; int ret = 0, 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]); exists = tcf_hash_check(tn, parm->index, a, bind); 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_hash_release(*a, bind); return -EINVAL; } push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]); if (push_vid >= VLAN_VID_MASK) { if (exists) tcf_hash_release(*a, bind); 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); } if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); break; default: if (exists) tcf_hash_release(*a, bind); return -EINVAL; } action = parm->v_action; if (!exists) { ret = tcf_hash_create(tn, parm->index, est, a, &act_vlan_ops, bind, false); if (ret) return ret; ret = ACT_P_CREATED; } else { 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_prio = push_prio; 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(tn, *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 = to_vlan(a); 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 || v->tcfv_action == TCA_VLAN_ACT_MODIFY) && (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) || (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, v->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; return skb->len; nla_put_failure: 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 tc_action_net *tn = net_generic(net, vlan_net_id); return tcf_generic_walker(tn, skb, cb, type, ops); } 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_hash_search(tn, a, index); } 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, .walk = tcf_vlan_walker, .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(tn, &act_vlan_ops, VLAN_TAB_MASK); } static void __net_exit vlan_exit_net(struct net *net) { struct tc_action_net *tn = net_generic(net, vlan_net_id); tc_action_net_exit(tn); } static struct pernet_operations vlan_net_ops = { .init = vlan_init_net, .exit = 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");