net/ncsi/ncsi-netlink.c

   1 /*
   2  * Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
   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/kernel.h>
  12 #include <linux/if_arp.h>
  13 #include <linux/rtnetlink.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/module.h>
  16 #include <net/genetlink.h>
  17 #include <net/ncsi.h>
  18 #include <linux/skbuff.h>
  19 #include <net/sock.h>
  20 #include <uapi/linux/ncsi.h>
  21
  22 #include "internal.h"
  23 #include "ncsi-netlink.h"
  24
  25 static struct genl_family ncsi_genl_family;
  26
  27 static const struct nla_policy ncsi_genl_policy[NCSI_ATTR_MAX + 1] = {
  28         [NCSI_ATTR_IFINDEX] =           { .type = NLA_U32 },
  29         [NCSI_ATTR_PACKAGE_LIST] =      { .type = NLA_NESTED },
  30         [NCSI_ATTR_PACKAGE_ID] =        { .type = NLA_U32 },
  31         [NCSI_ATTR_CHANNEL_ID] =        { .type = NLA_U32 },
  32 };
  33
  34 static struct ncsi_dev_priv *ndp_from_ifindex(struct net *net, u32 ifindex)
  35 {
  36         struct ncsi_dev_priv *ndp;
  37         struct net_device *dev;
  38         struct ncsi_dev *nd;
  39         struct ncsi_dev;
  40
  41         if (!net)
  42                 return NULL;
  43
  44         dev = dev_get_by_index(net, ifindex);
  45         if (!dev) {
  46                 pr_err("NCSI netlink: No device for ifindex %u\n", ifindex);
  47                 return NULL;
  48         }
  49
  50         nd = ncsi_find_dev(dev);
  51         ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
  52
  53         dev_put(dev);
  54         return ndp;
  55 }
  56
  57 static int ncsi_write_channel_info(struct sk_buff *skb,
  58                                    struct ncsi_dev_priv *ndp,
  59                                    struct ncsi_channel *nc)
  60 {
  61         struct ncsi_channel_vlan_filter *ncf;
  62         struct ncsi_channel_mode *m;
  63         struct nlattr *vid_nest;
  64         int i;
  65
  66         nla_put_u32(skb, NCSI_CHANNEL_ATTR_ID, nc->id);
  67         m = &nc->modes[NCSI_MODE_LINK];
  68         nla_put_u32(skb, NCSI_CHANNEL_ATTR_LINK_STATE, m->data[2]);
  69         if (nc->state == NCSI_CHANNEL_ACTIVE)
  70                 nla_put_flag(skb, NCSI_CHANNEL_ATTR_ACTIVE);
  71         if (ndp->force_channel == nc)
  72                 nla_put_flag(skb, NCSI_CHANNEL_ATTR_FORCED);
  73
  74         nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MAJOR, nc->version.version);
  75         nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MINOR, nc->version.alpha2);
  76         nla_put_string(skb, NCSI_CHANNEL_ATTR_VERSION_STR, nc->version.fw_name);
  77
  78         vid_nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR_VLAN_LIST);
  79         if (!vid_nest)
  80                 return -ENOMEM;
  81         ncf = &nc->vlan_filter;
  82         i = -1;
  83         while ((i = find_next_bit((void *)&ncf->bitmap, ncf->n_vids,
  84                                   i + 1)) < ncf->n_vids) {
  85                 if (ncf->vids[i])
  86                         nla_put_u16(skb, NCSI_CHANNEL_ATTR_VLAN_ID,
  87                                     ncf->vids[i]);
  88         }
  89         nla_nest_end(skb, vid_nest);
  90
  91         return 0;
  92 }
  93
  94 static int ncsi_write_package_info(struct sk_buff *skb,
  95                                    struct ncsi_dev_priv *ndp, unsigned int id)
  96 {
  97         struct nlattr *pnest, *cnest, *nest;
  98         struct ncsi_package *np;
  99         struct ncsi_channel *nc;
 100         bool found;
 101         int rc;
 102
 103         if (id > ndp->package_num - 1) {
 104                 netdev_info(ndp->ndev.dev, "NCSI: No package with id %u\n", id);
 105                 return -ENODEV;
 106         }
 107
 108         found = false;
 109         NCSI_FOR_EACH_PACKAGE(ndp, np) {
 110                 if (np->id != id)
 111                         continue;
 112                 pnest = nla_nest_start(skb, NCSI_PKG_ATTR);
 113                 if (!pnest)
 114                         return -ENOMEM;
 115                 nla_put_u32(skb, NCSI_PKG_ATTR_ID, np->id);
 116                 if (ndp->force_package == np)
 117                         nla_put_flag(skb, NCSI_PKG_ATTR_FORCED);
 118                 cnest = nla_nest_start(skb, NCSI_PKG_ATTR_CHANNEL_LIST);
 119                 if (!cnest) {
 120                         nla_nest_cancel(skb, pnest);
 121                         return -ENOMEM;
 122                 }
 123                 NCSI_FOR_EACH_CHANNEL(np, nc) {
 124                         nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR);
 125                         if (!nest) {
 126                                 nla_nest_cancel(skb, cnest);
 127                                 nla_nest_cancel(skb, pnest);
 128                                 return -ENOMEM;
 129                         }
 130                         rc = ncsi_write_channel_info(skb, ndp, nc);
 131                         if (rc) {
 132                                 nla_nest_cancel(skb, nest);
 133                                 nla_nest_cancel(skb, cnest);
 134                                 nla_nest_cancel(skb, pnest);
 135                                 return rc;
 136                         }
 137                         nla_nest_end(skb, nest);
 138                 }
 139                 nla_nest_end(skb, cnest);
 140                 nla_nest_end(skb, pnest);
 141                 found = true;
 142         }
 143
 144         if (!found)
 145                 return -ENODEV;
 146
 147         return 0;
 148 }
 149
 150 static int ncsi_pkg_info_nl(struct sk_buff *msg, struct genl_info *info)
 151 {
 152         struct ncsi_dev_priv *ndp;
 153         unsigned int package_id;
 154         struct sk_buff *skb;
 155         struct nlattr *attr;
 156         void *hdr;
 157         int rc;
 158
 159         if (!info || !info->attrs)
 160                 return -EINVAL;
 161
 162         if (!info->attrs[NCSI_ATTR_IFINDEX])
 163                 return -EINVAL;
 164
 165         if (!info->attrs[NCSI_ATTR_PACKAGE_ID])
 166                 return -EINVAL;
 167
 168         ndp = ndp_from_ifindex(genl_info_net(info),
 169                                nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
 170         if (!ndp)
 171                 return -ENODEV;
 172
 173         skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 174         if (!skb)
 175                 return -ENOMEM;
 176
 177         hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
 178                           &ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);
 179         if (!hdr) {
 180                 kfree_skb(skb);
 181                 return -EMSGSIZE;
 182         }
 183
 184         package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
 185
 186         attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
 187         if (!attr) {
 188                 kfree_skb(skb);
 189                 return -EMSGSIZE;
 190         }
 191         rc = ncsi_write_package_info(skb, ndp, package_id);
 192
 193         if (rc) {
 194                 nla_nest_cancel(skb, attr);
 195                 goto err;
 196         }
 197
 198         nla_nest_end(skb, attr);
 199
 200         genlmsg_end(skb, hdr);
 201         return genlmsg_reply(skb, info);
 202
 203 err:
 204         kfree_skb(skb);
 205         return rc;
 206 }
 207
 208 static int ncsi_pkg_info_all_nl(struct sk_buff *skb,
 209                                 struct netlink_callback *cb)
 210 {
 211         struct nlattr *attrs[NCSI_ATTR_MAX + 1];
 212         struct ncsi_package *np, *package;
 213         struct ncsi_dev_priv *ndp;
 214         unsigned int package_id;
 215         struct nlattr *attr;
 216         void *hdr;
 217         int rc;
 218
 219         rc = genlmsg_parse(cb->nlh, &ncsi_genl_family, attrs, NCSI_ATTR_MAX,
 220                            ncsi_genl_policy, NULL);
 221         if (rc)
 222                 return rc;
 223
 224         if (!attrs[NCSI_ATTR_IFINDEX])
 225                 return -EINVAL;
 226
 227         ndp = ndp_from_ifindex(get_net(sock_net(skb->sk)),
 228                                nla_get_u32(attrs[NCSI_ATTR_IFINDEX]));
 229
 230         if (!ndp)
 231                 return -ENODEV;
 232
 233         package_id = cb->args[0];
 234         package = NULL;
 235         NCSI_FOR_EACH_PACKAGE(ndp, np)
 236                 if (np->id == package_id)
 237                         package = np;
 238
 239         if (!package)
 240                 return 0; /* done */
 241
 242         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 243                           &ncsi_genl_family, NLM_F_MULTI,  NCSI_CMD_PKG_INFO);
 244         if (!hdr) {
 245                 rc = -EMSGSIZE;
 246                 goto err;
 247         }
 248
 249         attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
 250         rc = ncsi_write_package_info(skb, ndp, package->id);
 251         if (rc) {
 252                 nla_nest_cancel(skb, attr);
 253                 goto err;
 254         }
 255
 256         nla_nest_end(skb, attr);
 257         genlmsg_end(skb, hdr);
 258
 259         cb->args[0] = package_id + 1;
 260
 261         return skb->len;
 262 err:
 263         genlmsg_cancel(skb, hdr);
 264         return rc;
 265 }
 266
 267 static int ncsi_set_interface_nl(struct sk_buff *msg, struct genl_info *info)
 268 {
 269         struct ncsi_package *np, *package;
 270         struct ncsi_channel *nc, *channel;
 271         u32 package_id, channel_id;
 272         struct ncsi_dev_priv *ndp;
 273         unsigned long flags;
 274
 275         if (!info || !info->attrs)
 276                 return -EINVAL;
 277
 278         if (!info->attrs[NCSI_ATTR_IFINDEX])
 279                 return -EINVAL;
 280
 281         if (!info->attrs[NCSI_ATTR_PACKAGE_ID])
 282                 return -EINVAL;
 283
 284         ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
 285                                nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
 286         if (!ndp)
 287                 return -ENODEV;
 288
 289         package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
 290         package = NULL;
 291
 292         spin_lock_irqsave(&ndp->lock, flags);
 293
 294         NCSI_FOR_EACH_PACKAGE(ndp, np)
 295                 if (np->id == package_id)
 296                         package = np;
 297         if (!package) {
 298                 /* The user has set a package that does not exist */
 299                 spin_unlock_irqrestore(&ndp->lock, flags);
 300                 return -ERANGE;
 301         }
 302
 303         channel = NULL;
 304         if (!info->attrs[NCSI_ATTR_CHANNEL_ID]) {
 305                 /* Allow any channel */
 306                 channel_id = NCSI_RESERVED_CHANNEL;
 307         } else {
 308                 channel_id = nla_get_u32(info->attrs[NCSI_ATTR_CHANNEL_ID]);
 309                 NCSI_FOR_EACH_CHANNEL(package, nc)
 310                         if (nc->id == channel_id)
 311                                 channel = nc;
 312         }
 313
 314         if (channel_id != NCSI_RESERVED_CHANNEL && !channel) {
 315                 /* The user has set a channel that does not exist on this
 316                  * package
 317                  */
 318                 spin_unlock_irqrestore(&ndp->lock, flags);
 319                 netdev_info(ndp->ndev.dev, "NCSI: Channel %u does not exist!\n",
 320                             channel_id);
 321                 return -ERANGE;
 322         }
 323
 324         ndp->force_package = package;
 325         ndp->force_channel = channel;
 326         spin_unlock_irqrestore(&ndp->lock, flags);
 327
 328         netdev_info(ndp->ndev.dev, "Set package 0x%x, channel 0x%x%s as preferred\n",
 329                     package_id, channel_id,
 330                     channel_id == NCSI_RESERVED_CHANNEL ? " (any)" : "");
 331
 332         /* Bounce the NCSI channel to set changes */
 333         ncsi_stop_dev(&ndp->ndev);
 334         ncsi_start_dev(&ndp->ndev);
 335
 336         return 0;
 337 }
 338
 339 static int ncsi_clear_interface_nl(struct sk_buff *msg, struct genl_info *info)
 340 {
 341         struct ncsi_dev_priv *ndp;
 342         unsigned long flags;
 343
 344         if (!info || !info->attrs)
 345                 return -EINVAL;
 346
 347         if (!info->attrs[NCSI_ATTR_IFINDEX])
 348                 return -EINVAL;
 349
 350         ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
 351                                nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
 352         if (!ndp)
 353                 return -ENODEV;
 354
 355         /* Clear any override */
 356         spin_lock_irqsave(&ndp->lock, flags);
 357         ndp->force_package = NULL;
 358         ndp->force_channel = NULL;
 359         spin_unlock_irqrestore(&ndp->lock, flags);
 360         netdev_info(ndp->ndev.dev, "NCSI: Cleared preferred package/channel\n");
 361
 362         /* Bounce the NCSI channel to set changes */
 363         ncsi_stop_dev(&ndp->ndev);
 364         ncsi_start_dev(&ndp->ndev);
 365
 366         return 0;
 367 }
 368
 369 static const struct genl_ops ncsi_ops[] = {
 370         {
 371                 .cmd = NCSI_CMD_PKG_INFO,
 372                 .policy = ncsi_genl_policy,
 373                 .doit = ncsi_pkg_info_nl,
 374                 .dumpit = ncsi_pkg_info_all_nl,
 375                 .flags = 0,
 376         },
 377         {
 378                 .cmd = NCSI_CMD_SET_INTERFACE,
 379                 .policy = ncsi_genl_policy,
 380                 .doit = ncsi_set_interface_nl,
 381                 .flags = GENL_ADMIN_PERM,
 382         },
 383         {
 384                 .cmd = NCSI_CMD_CLEAR_INTERFACE,
 385                 .policy = ncsi_genl_policy,
 386                 .doit = ncsi_clear_interface_nl,
 387                 .flags = GENL_ADMIN_PERM,
 388         },
 389 };
 390
 391 static struct genl_family ncsi_genl_family __ro_after_init = {
 392         .name = "NCSI",
 393         .version = 0,
 394         .maxattr = NCSI_ATTR_MAX,
 395         .module = THIS_MODULE,
 396         .ops = ncsi_ops,
 397         .n_ops = ARRAY_SIZE(ncsi_ops),
 398 };
 399
 400 static int __init ncsi_init_netlink(void)
 401 {
 402         return genl_register_family(&ncsi_genl_family);
 403 }
 404 subsys_initcall(ncsi_init_netlink);