2 * Copyright Samuel Mendoza-Jonas, IBM Corporation 2018.
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.
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>
18 #include <linux/skbuff.h>
20 #include <uapi/linux/ncsi.h>
23 #include "ncsi-netlink.h"
25 static struct genl_family ncsi_genl_family;
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 },
34 static struct ncsi_dev_priv *ndp_from_ifindex(struct net *net, u32 ifindex)
36 struct ncsi_dev_priv *ndp;
37 struct net_device *dev;
44 dev = dev_get_by_index(net, ifindex);
46 pr_err("NCSI netlink: No device for ifindex %u\n", ifindex);
50 nd = ncsi_find_dev(dev);
51 ndp = nd ? TO_NCSI_DEV_PRIV(nd) : NULL;
57 static int ncsi_write_channel_info(struct sk_buff *skb,
58 struct ncsi_dev_priv *ndp,
59 struct ncsi_channel *nc)
61 struct nlattr *vid_nest;
62 struct ncsi_channel_filter *ncf;
63 struct ncsi_channel_mode *m;
67 nla_put_u32(skb, NCSI_CHANNEL_ATTR_ID, nc->id);
68 m = &nc->modes[NCSI_MODE_LINK];
69 nla_put_u32(skb, NCSI_CHANNEL_ATTR_LINK_STATE, m->data[2]);
70 if (nc->state == NCSI_CHANNEL_ACTIVE)
71 nla_put_flag(skb, NCSI_CHANNEL_ATTR_ACTIVE);
72 if (ndp->force_channel == nc)
73 nla_put_flag(skb, NCSI_CHANNEL_ATTR_FORCED);
75 nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MAJOR, nc->version.version);
76 nla_put_u32(skb, NCSI_CHANNEL_ATTR_VERSION_MINOR, nc->version.alpha2);
77 nla_put_string(skb, NCSI_CHANNEL_ATTR_VERSION_STR, nc->version.fw_name);
79 vid_nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR_VLAN_LIST);
82 ncf = nc->filters[NCSI_FILTER_VLAN];
85 while ((i = find_next_bit((void *)&ncf->bitmap, ncf->total,
86 i + 1)) < ncf->total) {
87 data = ncsi_get_filter(nc, NCSI_FILTER_VLAN, i);
88 /* Uninitialised channels will have 'zero' vlan ids */
91 nla_put_u16(skb, NCSI_CHANNEL_ATTR_VLAN_ID,
95 nla_nest_end(skb, vid_nest);
100 static int ncsi_write_package_info(struct sk_buff *skb,
101 struct ncsi_dev_priv *ndp, unsigned int id)
103 struct nlattr *pnest, *cnest, *nest;
104 struct ncsi_package *np;
105 struct ncsi_channel *nc;
109 if (id > ndp->package_num) {
110 netdev_info(ndp->ndev.dev, "NCSI: No package with id %u\n", id);
115 NCSI_FOR_EACH_PACKAGE(ndp, np) {
118 pnest = nla_nest_start(skb, NCSI_PKG_ATTR);
121 nla_put_u32(skb, NCSI_PKG_ATTR_ID, np->id);
122 if (ndp->force_package == np)
123 nla_put_flag(skb, NCSI_PKG_ATTR_FORCED);
124 cnest = nla_nest_start(skb, NCSI_PKG_ATTR_CHANNEL_LIST);
126 nla_nest_cancel(skb, pnest);
129 NCSI_FOR_EACH_CHANNEL(np, nc) {
130 nest = nla_nest_start(skb, NCSI_CHANNEL_ATTR);
132 nla_nest_cancel(skb, cnest);
133 nla_nest_cancel(skb, pnest);
136 rc = ncsi_write_channel_info(skb, ndp, nc);
138 nla_nest_cancel(skb, nest);
139 nla_nest_cancel(skb, cnest);
140 nla_nest_cancel(skb, pnest);
143 nla_nest_end(skb, nest);
145 nla_nest_end(skb, cnest);
146 nla_nest_end(skb, pnest);
156 static int ncsi_pkg_info_nl(struct sk_buff *msg, struct genl_info *info)
158 struct ncsi_dev_priv *ndp;
159 unsigned int package_id;
165 if (!info || !info->attrs)
168 if (!info->attrs[NCSI_ATTR_IFINDEX])
171 if (!info->attrs[NCSI_ATTR_PACKAGE_ID])
174 ndp = ndp_from_ifindex(genl_info_net(info),
175 nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
179 skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
183 hdr = genlmsg_put(skb, info->snd_portid, info->snd_seq,
184 &ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);
190 package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
192 attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
197 rc = ncsi_write_package_info(skb, ndp, package_id);
200 nla_nest_cancel(skb, attr);
204 nla_nest_end(skb, attr);
206 genlmsg_end(skb, hdr);
207 return genlmsg_reply(skb, info);
210 genlmsg_cancel(skb, hdr);
215 static int ncsi_pkg_info_all_nl(struct sk_buff *skb,
216 struct netlink_callback *cb)
218 struct nlattr *attrs[NCSI_ATTR_MAX];
219 struct ncsi_package *np, *package;
220 struct ncsi_dev_priv *ndp;
221 unsigned int package_id;
226 rc = genlmsg_parse(cb->nlh, &ncsi_genl_family, attrs, NCSI_ATTR_MAX,
227 ncsi_genl_policy, NULL);
231 if (!attrs[NCSI_ATTR_IFINDEX])
234 ndp = ndp_from_ifindex(get_net(sock_net(skb->sk)),
235 nla_get_u32(attrs[NCSI_ATTR_IFINDEX]));
240 package_id = cb->args[0];
242 NCSI_FOR_EACH_PACKAGE(ndp, np)
243 if (np->id == package_id)
249 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
250 &ncsi_genl_family, 0, NCSI_CMD_PKG_INFO);
256 attr = nla_nest_start(skb, NCSI_ATTR_PACKAGE_LIST);
257 rc = ncsi_write_package_info(skb, ndp, package->id);
259 nla_nest_cancel(skb, attr);
263 nla_nest_end(skb, attr);
264 genlmsg_end(skb, hdr);
266 cb->args[0] = package_id + 1;
270 genlmsg_cancel(skb, hdr);
274 static int ncsi_set_interface_nl(struct sk_buff *msg, struct genl_info *info)
276 struct ncsi_package *np, *package;
277 struct ncsi_channel *nc, *channel;
278 u32 package_id, channel_id;
279 struct ncsi_dev_priv *ndp;
282 if (!info || !info->attrs)
285 if (!info->attrs[NCSI_ATTR_IFINDEX])
288 if (!info->attrs[NCSI_ATTR_PACKAGE_ID])
291 ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
292 nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
296 package_id = nla_get_u32(info->attrs[NCSI_ATTR_PACKAGE_ID]);
299 spin_lock_irqsave(&ndp->lock, flags);
301 NCSI_FOR_EACH_PACKAGE(ndp, np)
302 if (np->id == package_id)
305 /* The user has set a package that does not exist */
306 spin_unlock_irqrestore(&ndp->lock, flags);
311 if (!info->attrs[NCSI_ATTR_CHANNEL_ID]) {
312 /* Allow any channel */
313 channel_id = NCSI_RESERVED_CHANNEL;
315 channel_id = nla_get_u32(info->attrs[NCSI_ATTR_CHANNEL_ID]);
316 NCSI_FOR_EACH_CHANNEL(package, nc)
317 if (nc->id == channel_id)
321 if (channel_id != NCSI_RESERVED_CHANNEL && !channel) {
322 /* The user has set a channel that does not exist on this
325 spin_unlock_irqrestore(&ndp->lock, flags);
326 netdev_info(ndp->ndev.dev, "NCSI: Channel %u does not exist!\n",
331 ndp->force_package = package;
332 ndp->force_channel = channel;
333 spin_unlock_irqrestore(&ndp->lock, flags);
335 netdev_info(ndp->ndev.dev, "Set package 0x%x, channel 0x%x%s as preferred\n",
336 package_id, channel_id,
337 channel_id == NCSI_RESERVED_CHANNEL ? " (any)" : "");
339 /* Bounce the NCSI channel to set changes */
340 ncsi_stop_dev(&ndp->ndev);
341 ncsi_start_dev(&ndp->ndev);
346 static int ncsi_clear_interface_nl(struct sk_buff *msg, struct genl_info *info)
348 struct ncsi_dev_priv *ndp;
351 if (!info || !info->attrs)
354 if (!info->attrs[NCSI_ATTR_IFINDEX])
357 ndp = ndp_from_ifindex(get_net(sock_net(msg->sk)),
358 nla_get_u32(info->attrs[NCSI_ATTR_IFINDEX]));
362 /* Clear any override */
363 spin_lock_irqsave(&ndp->lock, flags);
364 ndp->force_package = NULL;
365 ndp->force_channel = NULL;
366 spin_unlock_irqrestore(&ndp->lock, flags);
367 netdev_info(ndp->ndev.dev, "NCSI: Cleared preferred package/channel\n");
369 /* Bounce the NCSI channel to set changes */
370 ncsi_stop_dev(&ndp->ndev);
371 ncsi_start_dev(&ndp->ndev);
376 static const struct genl_ops ncsi_ops[] = {
378 .cmd = NCSI_CMD_PKG_INFO,
379 .policy = ncsi_genl_policy,
380 .doit = ncsi_pkg_info_nl,
381 .dumpit = ncsi_pkg_info_all_nl,
385 .cmd = NCSI_CMD_SET_INTERFACE,
386 .policy = ncsi_genl_policy,
387 .doit = ncsi_set_interface_nl,
388 .flags = GENL_ADMIN_PERM,
391 .cmd = NCSI_CMD_CLEAR_INTERFACE,
392 .policy = ncsi_genl_policy,
393 .doit = ncsi_clear_interface_nl,
394 .flags = GENL_ADMIN_PERM,
398 static struct genl_family ncsi_genl_family __ro_after_init = {
401 .maxattr = NCSI_ATTR_MAX,
402 .module = THIS_MODULE,
404 .n_ops = ARRAY_SIZE(ncsi_ops),
407 int ncsi_init_netlink(struct net_device *dev)
411 rc = genl_register_family(&ncsi_genl_family);
413 netdev_err(dev, "ncsi: failed to register netlink family\n");
418 int ncsi_unregister_netlink(struct net_device *dev)
422 rc = genl_unregister_family(&ncsi_genl_family);
424 netdev_err(dev, "ncsi: failed to unregister netlink family\n");