1 /* 2 * Copyright (c) 2008, Intel Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program; if not, see <http://www.gnu.org/licenses/>. 15 * 16 * Author: Alexander Duyck <alexander.h.duyck@intel.com> 17 */ 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/skbuff.h> 23 #include <linux/rtnetlink.h> 24 #include <net/netlink.h> 25 #include <net/pkt_sched.h> 26 27 #include <linux/tc_act/tc_skbedit.h> 28 #include <net/tc_act/tc_skbedit.h> 29 30 static unsigned int skbedit_net_id; 31 static struct tc_action_ops act_skbedit_ops; 32 33 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a, 34 struct tcf_result *res) 35 { 36 struct tcf_skbedit *d = to_skbedit(a); 37 38 spin_lock(&d->tcf_lock); 39 tcf_lastuse_update(&d->tcf_tm); 40 bstats_update(&d->tcf_bstats, skb); 41 42 if (d->flags & SKBEDIT_F_PRIORITY) 43 skb->priority = d->priority; 44 if (d->flags & SKBEDIT_F_QUEUE_MAPPING && 45 skb->dev->real_num_tx_queues > d->queue_mapping) 46 skb_set_queue_mapping(skb, d->queue_mapping); 47 if (d->flags & SKBEDIT_F_MARK) { 48 skb->mark &= ~d->mask; 49 skb->mark |= d->mark & d->mask; 50 } 51 if (d->flags & SKBEDIT_F_PTYPE) 52 skb->pkt_type = d->ptype; 53 54 spin_unlock(&d->tcf_lock); 55 return d->tcf_action; 56 } 57 58 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = { 59 [TCA_SKBEDIT_PARMS] = { .len = sizeof(struct tc_skbedit) }, 60 [TCA_SKBEDIT_PRIORITY] = { .len = sizeof(u32) }, 61 [TCA_SKBEDIT_QUEUE_MAPPING] = { .len = sizeof(u16) }, 62 [TCA_SKBEDIT_MARK] = { .len = sizeof(u32) }, 63 [TCA_SKBEDIT_PTYPE] = { .len = sizeof(u16) }, 64 [TCA_SKBEDIT_MASK] = { .len = sizeof(u32) }, 65 }; 66 67 static int tcf_skbedit_init(struct net *net, struct nlattr *nla, 68 struct nlattr *est, struct tc_action **a, 69 int ovr, int bind, struct netlink_ext_ack *extack) 70 { 71 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 72 struct nlattr *tb[TCA_SKBEDIT_MAX + 1]; 73 struct tc_skbedit *parm; 74 struct tcf_skbedit *d; 75 u32 flags = 0, *priority = NULL, *mark = NULL, *mask = NULL; 76 u16 *queue_mapping = NULL, *ptype = NULL; 77 bool exists = false; 78 int ret = 0, err; 79 80 if (nla == NULL) 81 return -EINVAL; 82 83 err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy, NULL); 84 if (err < 0) 85 return err; 86 87 if (tb[TCA_SKBEDIT_PARMS] == NULL) 88 return -EINVAL; 89 90 if (tb[TCA_SKBEDIT_PRIORITY] != NULL) { 91 flags |= SKBEDIT_F_PRIORITY; 92 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]); 93 } 94 95 if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) { 96 flags |= SKBEDIT_F_QUEUE_MAPPING; 97 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]); 98 } 99 100 if (tb[TCA_SKBEDIT_PTYPE] != NULL) { 101 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]); 102 if (!skb_pkt_type_ok(*ptype)) 103 return -EINVAL; 104 flags |= SKBEDIT_F_PTYPE; 105 } 106 107 if (tb[TCA_SKBEDIT_MARK] != NULL) { 108 flags |= SKBEDIT_F_MARK; 109 mark = nla_data(tb[TCA_SKBEDIT_MARK]); 110 } 111 112 if (tb[TCA_SKBEDIT_MASK] != NULL) { 113 flags |= SKBEDIT_F_MASK; 114 mask = nla_data(tb[TCA_SKBEDIT_MASK]); 115 } 116 117 parm = nla_data(tb[TCA_SKBEDIT_PARMS]); 118 119 exists = tcf_idr_check(tn, parm->index, a, bind); 120 if (exists && bind) 121 return 0; 122 123 if (!flags) { 124 if (exists) 125 tcf_idr_release(*a, bind); 126 return -EINVAL; 127 } 128 129 if (!exists) { 130 ret = tcf_idr_create(tn, parm->index, est, a, 131 &act_skbedit_ops, bind, false); 132 if (ret) 133 return ret; 134 135 d = to_skbedit(*a); 136 ret = ACT_P_CREATED; 137 } else { 138 d = to_skbedit(*a); 139 tcf_idr_release(*a, bind); 140 if (!ovr) 141 return -EEXIST; 142 } 143 144 spin_lock_bh(&d->tcf_lock); 145 146 d->flags = flags; 147 if (flags & SKBEDIT_F_PRIORITY) 148 d->priority = *priority; 149 if (flags & SKBEDIT_F_QUEUE_MAPPING) 150 d->queue_mapping = *queue_mapping; 151 if (flags & SKBEDIT_F_MARK) 152 d->mark = *mark; 153 if (flags & SKBEDIT_F_PTYPE) 154 d->ptype = *ptype; 155 /* default behaviour is to use all the bits */ 156 d->mask = 0xffffffff; 157 if (flags & SKBEDIT_F_MASK) 158 d->mask = *mask; 159 160 d->tcf_action = parm->action; 161 162 spin_unlock_bh(&d->tcf_lock); 163 164 if (ret == ACT_P_CREATED) 165 tcf_idr_insert(tn, *a); 166 return ret; 167 } 168 169 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a, 170 int bind, int ref) 171 { 172 unsigned char *b = skb_tail_pointer(skb); 173 struct tcf_skbedit *d = to_skbedit(a); 174 struct tc_skbedit opt = { 175 .index = d->tcf_index, 176 .refcnt = d->tcf_refcnt - ref, 177 .bindcnt = d->tcf_bindcnt - bind, 178 .action = d->tcf_action, 179 }; 180 struct tcf_t t; 181 182 if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt)) 183 goto nla_put_failure; 184 if ((d->flags & SKBEDIT_F_PRIORITY) && 185 nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority)) 186 goto nla_put_failure; 187 if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) && 188 nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping)) 189 goto nla_put_failure; 190 if ((d->flags & SKBEDIT_F_MARK) && 191 nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark)) 192 goto nla_put_failure; 193 if ((d->flags & SKBEDIT_F_PTYPE) && 194 nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype)) 195 goto nla_put_failure; 196 if ((d->flags & SKBEDIT_F_MASK) && 197 nla_put_u32(skb, TCA_SKBEDIT_MASK, d->mask)) 198 goto nla_put_failure; 199 200 tcf_tm_dump(&t, &d->tcf_tm); 201 if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD)) 202 goto nla_put_failure; 203 return skb->len; 204 205 nla_put_failure: 206 nlmsg_trim(skb, b); 207 return -1; 208 } 209 210 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb, 211 struct netlink_callback *cb, int type, 212 const struct tc_action_ops *ops, 213 struct netlink_ext_ack *extack) 214 { 215 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 216 217 return tcf_generic_walker(tn, skb, cb, type, ops, extack); 218 } 219 220 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index, 221 struct netlink_ext_ack *extack) 222 { 223 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 224 225 return tcf_idr_search(tn, a, index); 226 } 227 228 static struct tc_action_ops act_skbedit_ops = { 229 .kind = "skbedit", 230 .type = TCA_ACT_SKBEDIT, 231 .owner = THIS_MODULE, 232 .act = tcf_skbedit, 233 .dump = tcf_skbedit_dump, 234 .init = tcf_skbedit_init, 235 .walk = tcf_skbedit_walker, 236 .lookup = tcf_skbedit_search, 237 .size = sizeof(struct tcf_skbedit), 238 }; 239 240 static __net_init int skbedit_init_net(struct net *net) 241 { 242 struct tc_action_net *tn = net_generic(net, skbedit_net_id); 243 244 return tc_action_net_init(tn, &act_skbedit_ops); 245 } 246 247 static void __net_exit skbedit_exit_net(struct list_head *net_list) 248 { 249 tc_action_net_exit(net_list, skbedit_net_id); 250 } 251 252 static struct pernet_operations skbedit_net_ops = { 253 .init = skbedit_init_net, 254 .exit_batch = skbedit_exit_net, 255 .id = &skbedit_net_id, 256 .size = sizeof(struct tc_action_net), 257 }; 258 259 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>"); 260 MODULE_DESCRIPTION("SKB Editing"); 261 MODULE_LICENSE("GPL"); 262 263 static int __init skbedit_init_module(void) 264 { 265 return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops); 266 } 267 268 static void __exit skbedit_cleanup_module(void) 269 { 270 tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops); 271 } 272 273 module_init(skbedit_init_module); 274 module_exit(skbedit_cleanup_module); 275