| 1 | /* |
| 2 | * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/rtnetlink.h> |
| 15 | #include <linux/if_vlan.h> |
| 16 | #include <net/netlink.h> |
| 17 | #include <net/pkt_sched.h> |
| 18 | |
| 19 | #include <linux/tc_act/tc_vlan.h> |
| 20 | #include <net/tc_act/tc_vlan.h> |
| 21 | |
| 22 | #define VLAN_TAB_MASK 15 |
| 23 | |
| 24 | static int vlan_net_id; |
| 25 | static struct tc_action_ops act_vlan_ops; |
| 26 | |
| 27 | static int tcf_vlan(struct sk_buff *skb, const struct tc_action *a, |
| 28 | struct tcf_result *res) |
| 29 | { |
| 30 | struct tcf_vlan *v = to_vlan(a); |
| 31 | int action; |
| 32 | int err; |
| 33 | |
| 34 | spin_lock(&v->tcf_lock); |
| 35 | tcf_lastuse_update(&v->tcf_tm); |
| 36 | bstats_update(&v->tcf_bstats, skb); |
| 37 | action = v->tcf_action; |
| 38 | |
| 39 | switch (v->tcfv_action) { |
| 40 | case TCA_VLAN_ACT_POP: |
| 41 | err = skb_vlan_pop(skb); |
| 42 | if (err) |
| 43 | goto drop; |
| 44 | break; |
| 45 | case TCA_VLAN_ACT_PUSH: |
| 46 | err = skb_vlan_push(skb, v->tcfv_push_proto, v->tcfv_push_vid | |
| 47 | (v->tcfv_push_prio << VLAN_PRIO_SHIFT)); |
| 48 | if (err) |
| 49 | goto drop; |
| 50 | break; |
| 51 | default: |
| 52 | BUG(); |
| 53 | } |
| 54 | |
| 55 | goto unlock; |
| 56 | |
| 57 | drop: |
| 58 | action = TC_ACT_SHOT; |
| 59 | v->tcf_qstats.drops++; |
| 60 | unlock: |
| 61 | spin_unlock(&v->tcf_lock); |
| 62 | return action; |
| 63 | } |
| 64 | |
| 65 | static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = { |
| 66 | [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) }, |
| 67 | [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 }, |
| 68 | [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 }, |
| 69 | [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 }, |
| 70 | }; |
| 71 | |
| 72 | static int tcf_vlan_init(struct net *net, struct nlattr *nla, |
| 73 | struct nlattr *est, struct tc_action **a, |
| 74 | int ovr, int bind) |
| 75 | { |
| 76 | struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| 77 | struct nlattr *tb[TCA_VLAN_MAX + 1]; |
| 78 | struct tc_vlan *parm; |
| 79 | struct tcf_vlan *v; |
| 80 | int action; |
| 81 | __be16 push_vid = 0; |
| 82 | __be16 push_proto = 0; |
| 83 | u8 push_prio = 0; |
| 84 | bool exists = false; |
| 85 | int ret = 0, err; |
| 86 | |
| 87 | if (!nla) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | err = nla_parse_nested(tb, TCA_VLAN_MAX, nla, vlan_policy); |
| 91 | if (err < 0) |
| 92 | return err; |
| 93 | |
| 94 | if (!tb[TCA_VLAN_PARMS]) |
| 95 | return -EINVAL; |
| 96 | parm = nla_data(tb[TCA_VLAN_PARMS]); |
| 97 | exists = tcf_hash_check(tn, parm->index, a, bind); |
| 98 | if (exists && bind) |
| 99 | return 0; |
| 100 | |
| 101 | switch (parm->v_action) { |
| 102 | case TCA_VLAN_ACT_POP: |
| 103 | break; |
| 104 | case TCA_VLAN_ACT_PUSH: |
| 105 | if (!tb[TCA_VLAN_PUSH_VLAN_ID]) { |
| 106 | if (exists) |
| 107 | tcf_hash_release(*a, bind); |
| 108 | return -EINVAL; |
| 109 | } |
| 110 | push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]); |
| 111 | if (push_vid >= VLAN_VID_MASK) { |
| 112 | if (exists) |
| 113 | tcf_hash_release(*a, bind); |
| 114 | return -ERANGE; |
| 115 | } |
| 116 | |
| 117 | if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) { |
| 118 | push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]); |
| 119 | switch (push_proto) { |
| 120 | case htons(ETH_P_8021Q): |
| 121 | case htons(ETH_P_8021AD): |
| 122 | break; |
| 123 | default: |
| 124 | return -EPROTONOSUPPORT; |
| 125 | } |
| 126 | } else { |
| 127 | push_proto = htons(ETH_P_8021Q); |
| 128 | } |
| 129 | |
| 130 | if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) |
| 131 | push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); |
| 132 | break; |
| 133 | default: |
| 134 | if (exists) |
| 135 | tcf_hash_release(*a, bind); |
| 136 | return -EINVAL; |
| 137 | } |
| 138 | action = parm->v_action; |
| 139 | |
| 140 | if (!exists) { |
| 141 | ret = tcf_hash_create(tn, parm->index, est, a, |
| 142 | &act_vlan_ops, bind, false); |
| 143 | if (ret) |
| 144 | return ret; |
| 145 | |
| 146 | ret = ACT_P_CREATED; |
| 147 | } else { |
| 148 | tcf_hash_release(*a, bind); |
| 149 | if (!ovr) |
| 150 | return -EEXIST; |
| 151 | } |
| 152 | |
| 153 | v = to_vlan(*a); |
| 154 | |
| 155 | spin_lock_bh(&v->tcf_lock); |
| 156 | |
| 157 | v->tcfv_action = action; |
| 158 | v->tcfv_push_vid = push_vid; |
| 159 | v->tcfv_push_prio = push_prio; |
| 160 | v->tcfv_push_proto = push_proto; |
| 161 | |
| 162 | v->tcf_action = parm->action; |
| 163 | |
| 164 | spin_unlock_bh(&v->tcf_lock); |
| 165 | |
| 166 | if (ret == ACT_P_CREATED) |
| 167 | tcf_hash_insert(tn, *a); |
| 168 | return ret; |
| 169 | } |
| 170 | |
| 171 | static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a, |
| 172 | int bind, int ref) |
| 173 | { |
| 174 | unsigned char *b = skb_tail_pointer(skb); |
| 175 | struct tcf_vlan *v = to_vlan(a); |
| 176 | struct tc_vlan opt = { |
| 177 | .index = v->tcf_index, |
| 178 | .refcnt = v->tcf_refcnt - ref, |
| 179 | .bindcnt = v->tcf_bindcnt - bind, |
| 180 | .action = v->tcf_action, |
| 181 | .v_action = v->tcfv_action, |
| 182 | }; |
| 183 | struct tcf_t t; |
| 184 | |
| 185 | if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt)) |
| 186 | goto nla_put_failure; |
| 187 | |
| 188 | if (v->tcfv_action == TCA_VLAN_ACT_PUSH && |
| 189 | (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, v->tcfv_push_vid) || |
| 190 | nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, |
| 191 | v->tcfv_push_proto) || |
| 192 | (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, |
| 193 | v->tcfv_push_prio)))) |
| 194 | goto nla_put_failure; |
| 195 | |
| 196 | tcf_tm_dump(&t, &v->tcf_tm); |
| 197 | if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD)) |
| 198 | goto nla_put_failure; |
| 199 | return skb->len; |
| 200 | |
| 201 | nla_put_failure: |
| 202 | nlmsg_trim(skb, b); |
| 203 | return -1; |
| 204 | } |
| 205 | |
| 206 | static int tcf_vlan_walker(struct net *net, struct sk_buff *skb, |
| 207 | struct netlink_callback *cb, int type, |
| 208 | const struct tc_action_ops *ops) |
| 209 | { |
| 210 | struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| 211 | |
| 212 | return tcf_generic_walker(tn, skb, cb, type, ops); |
| 213 | } |
| 214 | |
| 215 | static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index) |
| 216 | { |
| 217 | struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| 218 | |
| 219 | return tcf_hash_search(tn, a, index); |
| 220 | } |
| 221 | |
| 222 | static struct tc_action_ops act_vlan_ops = { |
| 223 | .kind = "vlan", |
| 224 | .type = TCA_ACT_VLAN, |
| 225 | .owner = THIS_MODULE, |
| 226 | .act = tcf_vlan, |
| 227 | .dump = tcf_vlan_dump, |
| 228 | .init = tcf_vlan_init, |
| 229 | .walk = tcf_vlan_walker, |
| 230 | .lookup = tcf_vlan_search, |
| 231 | .size = sizeof(struct tcf_vlan), |
| 232 | }; |
| 233 | |
| 234 | static __net_init int vlan_init_net(struct net *net) |
| 235 | { |
| 236 | struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| 237 | |
| 238 | return tc_action_net_init(tn, &act_vlan_ops, VLAN_TAB_MASK); |
| 239 | } |
| 240 | |
| 241 | static void __net_exit vlan_exit_net(struct net *net) |
| 242 | { |
| 243 | struct tc_action_net *tn = net_generic(net, vlan_net_id); |
| 244 | |
| 245 | tc_action_net_exit(tn); |
| 246 | } |
| 247 | |
| 248 | static struct pernet_operations vlan_net_ops = { |
| 249 | .init = vlan_init_net, |
| 250 | .exit = vlan_exit_net, |
| 251 | .id = &vlan_net_id, |
| 252 | .size = sizeof(struct tc_action_net), |
| 253 | }; |
| 254 | |
| 255 | static int __init vlan_init_module(void) |
| 256 | { |
| 257 | return tcf_register_action(&act_vlan_ops, &vlan_net_ops); |
| 258 | } |
| 259 | |
| 260 | static void __exit vlan_cleanup_module(void) |
| 261 | { |
| 262 | tcf_unregister_action(&act_vlan_ops, &vlan_net_ops); |
| 263 | } |
| 264 | |
| 265 | module_init(vlan_init_module); |
| 266 | module_exit(vlan_cleanup_module); |
| 267 | |
| 268 | MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); |
| 269 | MODULE_DESCRIPTION("vlan manipulation actions"); |
| 270 | MODULE_LICENSE("GPL v2"); |