![Johannes Berg](/assets/img/avatar_default.png)
Contrary to common expectations for an "int" return, these functions return only a positive value -- if used correctly they cannot even return 0 because the message header will necessarily be in the skb. This makes the very common pattern of if (genlmsg_end(...) < 0) { ... } be a whole bunch of dead code. Many places also simply do return nlmsg_end(...); and the caller is expected to deal with it. This also commonly (at least for me) causes errors, because it is very common to write if (my_function(...)) /* error condition */ and if my_function() does "return nlmsg_end()" this is of course wrong. Additionally, there's not a single place in the kernel that actually needs the message length returned, and if anyone needs it later then it'll be very easy to just use skb->len there. Remove this, and make the functions void. This removes a bunch of dead code as described above. The patch adds lines because I did - return nlmsg_end(...); + nlmsg_end(...); + return 0; I could have preserved all the function's return values by returning skb->len, but instead I've audited all the places calling the affected functions and found that none cared. A few places actually compared the return value with <= 0 in dump functionality, but that could just be changed to < 0 with no change in behaviour, so I opted for the more efficient version. One instance of the error I've made numerous times now is also present in net/phonet/pn_netlink.c in the route_dumpit() function - it didn't check for <0 or <=0 and thus broke out of the loop every single time. I've preserved this since it will (I think) have caused the messages to userspace to be formatted differently with just a single message for every SKB returned to userspace. It's possible that this isn't needed for the tools that actually use this, but I don't even know what they are so couldn't test that changing this behaviour would be acceptable. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1000 lines
26 KiB
C
1000 lines
26 KiB
C
/* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* Authors:
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* Alexander Aring <aar@pengutronix.de>
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*
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* Based on: net/wireless/nl80211.c
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*/
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#include <linux/rtnetlink.h>
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#include <net/cfg802154.h>
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#include <net/genetlink.h>
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#include <net/mac802154.h>
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#include <net/netlink.h>
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#include <net/nl802154.h>
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#include <net/sock.h>
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#include "nl802154.h"
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#include "rdev-ops.h"
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#include "core.h"
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static int nl802154_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
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struct genl_info *info);
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static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
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struct genl_info *info);
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/* the netlink family */
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static struct genl_family nl802154_fam = {
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.id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
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.name = NL802154_GENL_NAME, /* have users key off the name instead */
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.hdrsize = 0, /* no private header */
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.version = 1, /* no particular meaning now */
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.maxattr = NL802154_ATTR_MAX,
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.netnsok = true,
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.pre_doit = nl802154_pre_doit,
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.post_doit = nl802154_post_doit,
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};
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/* multicast groups */
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enum nl802154_multicast_groups {
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NL802154_MCGRP_CONFIG,
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};
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static const struct genl_multicast_group nl802154_mcgrps[] = {
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[NL802154_MCGRP_CONFIG] = { .name = "config", },
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};
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/* returns ERR_PTR values */
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static struct wpan_dev *
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__cfg802154_wpan_dev_from_attrs(struct net *netns, struct nlattr **attrs)
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{
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struct cfg802154_registered_device *rdev;
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struct wpan_dev *result = NULL;
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bool have_ifidx = attrs[NL802154_ATTR_IFINDEX];
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bool have_wpan_dev_id = attrs[NL802154_ATTR_WPAN_DEV];
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u64 wpan_dev_id;
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int wpan_phy_idx = -1;
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int ifidx = -1;
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ASSERT_RTNL();
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if (!have_ifidx && !have_wpan_dev_id)
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return ERR_PTR(-EINVAL);
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if (have_ifidx)
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ifidx = nla_get_u32(attrs[NL802154_ATTR_IFINDEX]);
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if (have_wpan_dev_id) {
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wpan_dev_id = nla_get_u64(attrs[NL802154_ATTR_WPAN_DEV]);
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wpan_phy_idx = wpan_dev_id >> 32;
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}
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list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
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struct wpan_dev *wpan_dev;
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/* TODO netns compare */
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if (have_wpan_dev_id && rdev->wpan_phy_idx != wpan_phy_idx)
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continue;
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list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) {
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if (have_ifidx && wpan_dev->netdev &&
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wpan_dev->netdev->ifindex == ifidx) {
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result = wpan_dev;
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break;
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}
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if (have_wpan_dev_id &&
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wpan_dev->identifier == (u32)wpan_dev_id) {
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result = wpan_dev;
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break;
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}
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}
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if (result)
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break;
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}
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if (result)
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return result;
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return ERR_PTR(-ENODEV);
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}
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static struct cfg802154_registered_device *
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__cfg802154_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
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{
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struct cfg802154_registered_device *rdev = NULL, *tmp;
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struct net_device *netdev;
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ASSERT_RTNL();
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if (!attrs[NL802154_ATTR_WPAN_PHY] &&
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!attrs[NL802154_ATTR_IFINDEX] &&
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!attrs[NL802154_ATTR_WPAN_DEV])
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return ERR_PTR(-EINVAL);
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if (attrs[NL802154_ATTR_WPAN_PHY])
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rdev = cfg802154_rdev_by_wpan_phy_idx(
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nla_get_u32(attrs[NL802154_ATTR_WPAN_PHY]));
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if (attrs[NL802154_ATTR_WPAN_DEV]) {
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u64 wpan_dev_id = nla_get_u64(attrs[NL802154_ATTR_WPAN_DEV]);
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struct wpan_dev *wpan_dev;
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bool found = false;
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tmp = cfg802154_rdev_by_wpan_phy_idx(wpan_dev_id >> 32);
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if (tmp) {
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/* make sure wpan_dev exists */
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list_for_each_entry(wpan_dev, &tmp->wpan_dev_list, list) {
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if (wpan_dev->identifier != (u32)wpan_dev_id)
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continue;
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found = true;
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break;
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}
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if (!found)
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tmp = NULL;
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if (rdev && tmp != rdev)
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return ERR_PTR(-EINVAL);
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rdev = tmp;
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}
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}
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if (attrs[NL802154_ATTR_IFINDEX]) {
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int ifindex = nla_get_u32(attrs[NL802154_ATTR_IFINDEX]);
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netdev = __dev_get_by_index(netns, ifindex);
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if (netdev) {
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if (netdev->ieee802154_ptr)
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tmp = wpan_phy_to_rdev(
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netdev->ieee802154_ptr->wpan_phy);
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else
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tmp = NULL;
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/* not wireless device -- return error */
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if (!tmp)
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return ERR_PTR(-EINVAL);
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/* mismatch -- return error */
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if (rdev && tmp != rdev)
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return ERR_PTR(-EINVAL);
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rdev = tmp;
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}
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}
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if (!rdev)
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return ERR_PTR(-ENODEV);
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/* TODO netns compare */
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return rdev;
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}
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/* This function returns a pointer to the driver
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* that the genl_info item that is passed refers to.
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*
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* The result of this can be a PTR_ERR and hence must
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* be checked with IS_ERR() for errors.
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*/
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static struct cfg802154_registered_device *
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cfg802154_get_dev_from_info(struct net *netns, struct genl_info *info)
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{
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return __cfg802154_rdev_from_attrs(netns, info->attrs);
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}
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/* policy for the attributes */
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static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
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[NL802154_ATTR_WPAN_PHY] = { .type = NLA_U32 },
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[NL802154_ATTR_WPAN_PHY_NAME] = { .type = NLA_NUL_STRING,
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.len = 20-1 },
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[NL802154_ATTR_IFINDEX] = { .type = NLA_U32 },
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[NL802154_ATTR_IFTYPE] = { .type = NLA_U32 },
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[NL802154_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
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[NL802154_ATTR_WPAN_DEV] = { .type = NLA_U64 },
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[NL802154_ATTR_PAGE] = { .type = NLA_U8, },
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[NL802154_ATTR_CHANNEL] = { .type = NLA_U8, },
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[NL802154_ATTR_TX_POWER] = { .type = NLA_S8, },
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[NL802154_ATTR_CCA_MODE] = { .type = NLA_U32, },
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[NL802154_ATTR_CCA_OPT] = { .type = NLA_U32, },
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[NL802154_ATTR_SUPPORTED_CHANNEL] = { .type = NLA_U32, },
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[NL802154_ATTR_PAN_ID] = { .type = NLA_U16, },
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[NL802154_ATTR_EXTENDED_ADDR] = { .type = NLA_U64 },
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[NL802154_ATTR_SHORT_ADDR] = { .type = NLA_U16, },
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[NL802154_ATTR_MIN_BE] = { .type = NLA_U8, },
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[NL802154_ATTR_MAX_BE] = { .type = NLA_U8, },
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[NL802154_ATTR_MAX_CSMA_BACKOFFS] = { .type = NLA_U8, },
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[NL802154_ATTR_MAX_FRAME_RETRIES] = { .type = NLA_S8, },
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[NL802154_ATTR_LBT_MODE] = { .type = NLA_U8, },
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};
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/* message building helper */
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static inline void *nl802154hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
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int flags, u8 cmd)
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{
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/* since there is no private header just add the generic one */
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return genlmsg_put(skb, portid, seq, &nl802154_fam, flags, cmd);
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}
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static int
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nl802154_send_wpan_phy_channels(struct cfg802154_registered_device *rdev,
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struct sk_buff *msg)
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{
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struct nlattr *nl_page;
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unsigned long page;
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nl_page = nla_nest_start(msg, NL802154_ATTR_CHANNELS_SUPPORTED);
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if (!nl_page)
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return -ENOBUFS;
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for (page = 0; page <= IEEE802154_MAX_PAGE; page++) {
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if (nla_put_u32(msg, NL802154_ATTR_SUPPORTED_CHANNEL,
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rdev->wpan_phy.channels_supported[page]))
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return -ENOBUFS;
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}
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nla_nest_end(msg, nl_page);
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return 0;
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}
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static int nl802154_send_wpan_phy(struct cfg802154_registered_device *rdev,
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enum nl802154_commands cmd,
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struct sk_buff *msg, u32 portid, u32 seq,
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int flags)
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{
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void *hdr;
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hdr = nl802154hdr_put(msg, portid, seq, flags, cmd);
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if (!hdr)
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return -ENOBUFS;
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if (nla_put_u32(msg, NL802154_ATTR_WPAN_PHY, rdev->wpan_phy_idx) ||
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nla_put_string(msg, NL802154_ATTR_WPAN_PHY_NAME,
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wpan_phy_name(&rdev->wpan_phy)) ||
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nla_put_u32(msg, NL802154_ATTR_GENERATION,
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cfg802154_rdev_list_generation))
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goto nla_put_failure;
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if (cmd != NL802154_CMD_NEW_WPAN_PHY)
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goto finish;
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/* DUMP PHY PIB */
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/* current channel settings */
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if (nla_put_u8(msg, NL802154_ATTR_PAGE,
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rdev->wpan_phy.current_page) ||
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nla_put_u8(msg, NL802154_ATTR_CHANNEL,
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rdev->wpan_phy.current_channel))
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goto nla_put_failure;
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/* supported channels array */
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if (nl802154_send_wpan_phy_channels(rdev, msg))
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goto nla_put_failure;
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/* cca mode */
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if (nla_put_u32(msg, NL802154_ATTR_CCA_MODE,
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rdev->wpan_phy.cca.mode))
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goto nla_put_failure;
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if (rdev->wpan_phy.cca.mode == NL802154_CCA_ENERGY_CARRIER) {
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if (nla_put_u32(msg, NL802154_ATTR_CCA_OPT,
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rdev->wpan_phy.cca.opt))
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goto nla_put_failure;
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}
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if (nla_put_s8(msg, NL802154_ATTR_TX_POWER,
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rdev->wpan_phy.transmit_power))
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goto nla_put_failure;
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finish:
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genlmsg_end(msg, hdr);
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return 0;
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nla_put_failure:
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genlmsg_cancel(msg, hdr);
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return -EMSGSIZE;
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}
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struct nl802154_dump_wpan_phy_state {
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s64 filter_wpan_phy;
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long start;
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};
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static int nl802154_dump_wpan_phy_parse(struct sk_buff *skb,
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struct netlink_callback *cb,
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struct nl802154_dump_wpan_phy_state *state)
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{
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struct nlattr **tb = nl802154_fam.attrbuf;
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int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize,
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tb, nl802154_fam.maxattr, nl802154_policy);
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/* TODO check if we can handle error here,
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* we have no backward compatibility
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*/
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if (ret)
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return 0;
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if (tb[NL802154_ATTR_WPAN_PHY])
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state->filter_wpan_phy = nla_get_u32(tb[NL802154_ATTR_WPAN_PHY]);
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if (tb[NL802154_ATTR_WPAN_DEV])
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state->filter_wpan_phy = nla_get_u64(tb[NL802154_ATTR_WPAN_DEV]) >> 32;
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if (tb[NL802154_ATTR_IFINDEX]) {
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struct net_device *netdev;
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struct cfg802154_registered_device *rdev;
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int ifidx = nla_get_u32(tb[NL802154_ATTR_IFINDEX]);
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/* TODO netns */
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netdev = __dev_get_by_index(&init_net, ifidx);
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if (!netdev)
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return -ENODEV;
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if (netdev->ieee802154_ptr) {
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rdev = wpan_phy_to_rdev(
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netdev->ieee802154_ptr->wpan_phy);
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state->filter_wpan_phy = rdev->wpan_phy_idx;
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}
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}
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return 0;
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}
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static int
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nl802154_dump_wpan_phy(struct sk_buff *skb, struct netlink_callback *cb)
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{
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int idx = 0, ret;
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struct nl802154_dump_wpan_phy_state *state = (void *)cb->args[0];
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struct cfg802154_registered_device *rdev;
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rtnl_lock();
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if (!state) {
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state = kzalloc(sizeof(*state), GFP_KERNEL);
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if (!state) {
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rtnl_unlock();
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return -ENOMEM;
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}
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state->filter_wpan_phy = -1;
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ret = nl802154_dump_wpan_phy_parse(skb, cb, state);
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if (ret) {
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kfree(state);
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rtnl_unlock();
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return ret;
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}
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cb->args[0] = (long)state;
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}
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list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
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/* TODO net ns compare */
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if (++idx <= state->start)
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continue;
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if (state->filter_wpan_phy != -1 &&
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state->filter_wpan_phy != rdev->wpan_phy_idx)
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continue;
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/* attempt to fit multiple wpan_phy data chunks into the skb */
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ret = nl802154_send_wpan_phy(rdev,
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NL802154_CMD_NEW_WPAN_PHY,
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skb,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI);
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if (ret < 0) {
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if ((ret == -ENOBUFS || ret == -EMSGSIZE) &&
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!skb->len && cb->min_dump_alloc < 4096) {
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cb->min_dump_alloc = 4096;
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rtnl_unlock();
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return 1;
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}
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idx--;
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break;
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}
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break;
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}
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rtnl_unlock();
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state->start = idx;
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return skb->len;
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}
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static int nl802154_dump_wpan_phy_done(struct netlink_callback *cb)
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{
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kfree((void *)cb->args[0]);
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return 0;
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}
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static int nl802154_get_wpan_phy(struct sk_buff *skb, struct genl_info *info)
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{
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struct sk_buff *msg;
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struct cfg802154_registered_device *rdev = info->user_ptr[0];
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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if (nl802154_send_wpan_phy(rdev, NL802154_CMD_NEW_WPAN_PHY, msg,
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info->snd_portid, info->snd_seq, 0) < 0) {
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nlmsg_free(msg);
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return -ENOBUFS;
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}
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return genlmsg_reply(msg, info);
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}
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static inline u64 wpan_dev_id(struct wpan_dev *wpan_dev)
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{
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return (u64)wpan_dev->identifier |
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((u64)wpan_phy_to_rdev(wpan_dev->wpan_phy)->wpan_phy_idx << 32);
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}
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static int
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nl802154_send_iface(struct sk_buff *msg, u32 portid, u32 seq, int flags,
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struct cfg802154_registered_device *rdev,
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struct wpan_dev *wpan_dev)
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{
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struct net_device *dev = wpan_dev->netdev;
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void *hdr;
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hdr = nl802154hdr_put(msg, portid, seq, flags,
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NL802154_CMD_NEW_INTERFACE);
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if (!hdr)
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return -1;
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if (dev &&
|
|
(nla_put_u32(msg, NL802154_ATTR_IFINDEX, dev->ifindex) ||
|
|
nla_put_string(msg, NL802154_ATTR_IFNAME, dev->name)))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(msg, NL802154_ATTR_WPAN_PHY, rdev->wpan_phy_idx) ||
|
|
nla_put_u32(msg, NL802154_ATTR_IFTYPE, wpan_dev->iftype) ||
|
|
nla_put_u64(msg, NL802154_ATTR_WPAN_DEV, wpan_dev_id(wpan_dev)) ||
|
|
nla_put_u32(msg, NL802154_ATTR_GENERATION,
|
|
rdev->devlist_generation ^
|
|
(cfg802154_rdev_list_generation << 2)))
|
|
goto nla_put_failure;
|
|
|
|
/* address settings */
|
|
if (nla_put_le64(msg, NL802154_ATTR_EXTENDED_ADDR,
|
|
wpan_dev->extended_addr) ||
|
|
nla_put_le16(msg, NL802154_ATTR_SHORT_ADDR,
|
|
wpan_dev->short_addr) ||
|
|
nla_put_le16(msg, NL802154_ATTR_PAN_ID, wpan_dev->pan_id))
|
|
goto nla_put_failure;
|
|
|
|
/* ARET handling */
|
|
if (nla_put_s8(msg, NL802154_ATTR_MAX_FRAME_RETRIES,
|
|
wpan_dev->frame_retries) ||
|
|
nla_put_u8(msg, NL802154_ATTR_MAX_BE, wpan_dev->max_be) ||
|
|
nla_put_u8(msg, NL802154_ATTR_MAX_CSMA_BACKOFFS,
|
|
wpan_dev->csma_retries) ||
|
|
nla_put_u8(msg, NL802154_ATTR_MIN_BE, wpan_dev->min_be))
|
|
goto nla_put_failure;
|
|
|
|
/* listen before transmit */
|
|
if (nla_put_u8(msg, NL802154_ATTR_LBT_MODE, wpan_dev->lbt))
|
|
goto nla_put_failure;
|
|
|
|
genlmsg_end(msg, hdr);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
genlmsg_cancel(msg, hdr);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int
|
|
nl802154_dump_interface(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int wp_idx = 0;
|
|
int if_idx = 0;
|
|
int wp_start = cb->args[0];
|
|
int if_start = cb->args[1];
|
|
struct cfg802154_registered_device *rdev;
|
|
struct wpan_dev *wpan_dev;
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
|
|
/* TODO netns compare */
|
|
if (wp_idx < wp_start) {
|
|
wp_idx++;
|
|
continue;
|
|
}
|
|
if_idx = 0;
|
|
|
|
list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) {
|
|
if (if_idx < if_start) {
|
|
if_idx++;
|
|
continue;
|
|
}
|
|
if (nl802154_send_iface(skb, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
rdev, wpan_dev) < 0) {
|
|
goto out;
|
|
}
|
|
if_idx++;
|
|
}
|
|
|
|
wp_idx++;
|
|
}
|
|
out:
|
|
rtnl_unlock();
|
|
|
|
cb->args[0] = wp_idx;
|
|
cb->args[1] = if_idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int nl802154_get_interface(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct sk_buff *msg;
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct wpan_dev *wdev = info->user_ptr[1];
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
if (nl802154_send_iface(msg, info->snd_portid, info->snd_seq, 0,
|
|
rdev, wdev) < 0) {
|
|
nlmsg_free(msg);
|
|
return -ENOBUFS;
|
|
}
|
|
|
|
return genlmsg_reply(msg, info);
|
|
}
|
|
|
|
static int nl802154_new_interface(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
enum nl802154_iftype type = NL802154_IFTYPE_UNSPEC;
|
|
__le64 extended_addr = cpu_to_le64(0x0000000000000000ULL);
|
|
|
|
/* TODO avoid failing a new interface
|
|
* creation due to pending removal?
|
|
*/
|
|
|
|
if (!info->attrs[NL802154_ATTR_IFNAME])
|
|
return -EINVAL;
|
|
|
|
if (info->attrs[NL802154_ATTR_IFTYPE]) {
|
|
type = nla_get_u32(info->attrs[NL802154_ATTR_IFTYPE]);
|
|
if (type > NL802154_IFTYPE_MAX)
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* TODO add nla_get_le64 to netlink */
|
|
if (info->attrs[NL802154_ATTR_EXTENDED_ADDR])
|
|
extended_addr = (__force __le64)nla_get_u64(
|
|
info->attrs[NL802154_ATTR_EXTENDED_ADDR]);
|
|
|
|
if (!rdev->ops->add_virtual_intf)
|
|
return -EOPNOTSUPP;
|
|
|
|
return rdev_add_virtual_intf(rdev,
|
|
nla_data(info->attrs[NL802154_ATTR_IFNAME]),
|
|
type, extended_addr);
|
|
}
|
|
|
|
static int nl802154_del_interface(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct wpan_dev *wpan_dev = info->user_ptr[1];
|
|
|
|
if (!rdev->ops->del_virtual_intf)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* If we remove a wpan device without a netdev then clear
|
|
* user_ptr[1] so that nl802154_post_doit won't dereference it
|
|
* to check if it needs to do dev_put(). Otherwise it crashes
|
|
* since the wpan_dev has been freed, unlike with a netdev where
|
|
* we need the dev_put() for the netdev to really be freed.
|
|
*/
|
|
if (!wpan_dev->netdev)
|
|
info->user_ptr[1] = NULL;
|
|
|
|
return rdev_del_virtual_intf(rdev, wpan_dev);
|
|
}
|
|
|
|
static int nl802154_set_channel(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
u8 channel, page;
|
|
|
|
if (!info->attrs[NL802154_ATTR_PAGE] ||
|
|
!info->attrs[NL802154_ATTR_CHANNEL])
|
|
return -EINVAL;
|
|
|
|
page = nla_get_u8(info->attrs[NL802154_ATTR_PAGE]);
|
|
channel = nla_get_u8(info->attrs[NL802154_ATTR_CHANNEL]);
|
|
|
|
/* check 802.15.4 constraints */
|
|
if (page > IEEE802154_MAX_PAGE || channel > IEEE802154_MAX_CHANNEL)
|
|
return -EINVAL;
|
|
|
|
return rdev_set_channel(rdev, page, channel);
|
|
}
|
|
|
|
static int nl802154_set_cca_mode(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct wpan_phy_cca cca;
|
|
|
|
if (!info->attrs[NL802154_ATTR_CCA_MODE])
|
|
return -EINVAL;
|
|
|
|
cca.mode = nla_get_u32(info->attrs[NL802154_ATTR_CCA_MODE]);
|
|
/* checking 802.15.4 constraints */
|
|
if (cca.mode < NL802154_CCA_ENERGY || cca.mode > NL802154_CCA_ATTR_MAX)
|
|
return -EINVAL;
|
|
|
|
if (cca.mode == NL802154_CCA_ENERGY_CARRIER) {
|
|
if (!info->attrs[NL802154_ATTR_CCA_OPT])
|
|
return -EINVAL;
|
|
|
|
cca.opt = nla_get_u32(info->attrs[NL802154_ATTR_CCA_OPT]);
|
|
if (cca.opt > NL802154_CCA_OPT_ATTR_MAX)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return rdev_set_cca_mode(rdev, &cca);
|
|
}
|
|
|
|
static int nl802154_set_pan_id(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct net_device *dev = info->user_ptr[1];
|
|
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
|
|
__le16 pan_id;
|
|
|
|
/* conflict here while tx/rx calls */
|
|
if (netif_running(dev))
|
|
return -EBUSY;
|
|
|
|
/* don't change address fields on monitor */
|
|
if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR)
|
|
return -EINVAL;
|
|
|
|
if (!info->attrs[NL802154_ATTR_PAN_ID])
|
|
return -EINVAL;
|
|
|
|
pan_id = nla_get_le16(info->attrs[NL802154_ATTR_PAN_ID]);
|
|
|
|
return rdev_set_pan_id(rdev, wpan_dev, pan_id);
|
|
}
|
|
|
|
static int nl802154_set_short_addr(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct net_device *dev = info->user_ptr[1];
|
|
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
|
|
__le16 short_addr;
|
|
|
|
/* conflict here while tx/rx calls */
|
|
if (netif_running(dev))
|
|
return -EBUSY;
|
|
|
|
/* don't change address fields on monitor */
|
|
if (wpan_dev->iftype == NL802154_IFTYPE_MONITOR)
|
|
return -EINVAL;
|
|
|
|
if (!info->attrs[NL802154_ATTR_SHORT_ADDR])
|
|
return -EINVAL;
|
|
|
|
short_addr = nla_get_le16(info->attrs[NL802154_ATTR_SHORT_ADDR]);
|
|
|
|
return rdev_set_short_addr(rdev, wpan_dev, short_addr);
|
|
}
|
|
|
|
static int
|
|
nl802154_set_backoff_exponent(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct net_device *dev = info->user_ptr[1];
|
|
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
|
|
u8 min_be, max_be;
|
|
|
|
/* should be set on netif open inside phy settings */
|
|
if (netif_running(dev))
|
|
return -EBUSY;
|
|
|
|
if (!info->attrs[NL802154_ATTR_MIN_BE] ||
|
|
!info->attrs[NL802154_ATTR_MAX_BE])
|
|
return -EINVAL;
|
|
|
|
min_be = nla_get_u8(info->attrs[NL802154_ATTR_MIN_BE]);
|
|
max_be = nla_get_u8(info->attrs[NL802154_ATTR_MAX_BE]);
|
|
|
|
/* check 802.15.4 constraints */
|
|
if (max_be < 3 || max_be > 8 || min_be > max_be)
|
|
return -EINVAL;
|
|
|
|
return rdev_set_backoff_exponent(rdev, wpan_dev, min_be, max_be);
|
|
}
|
|
|
|
static int
|
|
nl802154_set_max_csma_backoffs(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct net_device *dev = info->user_ptr[1];
|
|
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
|
|
u8 max_csma_backoffs;
|
|
|
|
/* conflict here while other running iface settings */
|
|
if (netif_running(dev))
|
|
return -EBUSY;
|
|
|
|
if (!info->attrs[NL802154_ATTR_MAX_CSMA_BACKOFFS])
|
|
return -EINVAL;
|
|
|
|
max_csma_backoffs = nla_get_u8(
|
|
info->attrs[NL802154_ATTR_MAX_CSMA_BACKOFFS]);
|
|
|
|
/* check 802.15.4 constraints */
|
|
if (max_csma_backoffs > 5)
|
|
return -EINVAL;
|
|
|
|
return rdev_set_max_csma_backoffs(rdev, wpan_dev, max_csma_backoffs);
|
|
}
|
|
|
|
static int
|
|
nl802154_set_max_frame_retries(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct net_device *dev = info->user_ptr[1];
|
|
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
|
|
s8 max_frame_retries;
|
|
|
|
if (netif_running(dev))
|
|
return -EBUSY;
|
|
|
|
if (!info->attrs[NL802154_ATTR_MAX_FRAME_RETRIES])
|
|
return -EINVAL;
|
|
|
|
max_frame_retries = nla_get_s8(
|
|
info->attrs[NL802154_ATTR_MAX_FRAME_RETRIES]);
|
|
|
|
/* check 802.15.4 constraints */
|
|
if (max_frame_retries < -1 || max_frame_retries > 7)
|
|
return -EINVAL;
|
|
|
|
return rdev_set_max_frame_retries(rdev, wpan_dev, max_frame_retries);
|
|
}
|
|
|
|
static int nl802154_set_lbt_mode(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev = info->user_ptr[0];
|
|
struct net_device *dev = info->user_ptr[1];
|
|
struct wpan_dev *wpan_dev = dev->ieee802154_ptr;
|
|
bool mode;
|
|
|
|
if (netif_running(dev))
|
|
return -EBUSY;
|
|
|
|
if (!info->attrs[NL802154_ATTR_LBT_MODE])
|
|
return -EINVAL;
|
|
|
|
mode = !!nla_get_u8(info->attrs[NL802154_ATTR_LBT_MODE]);
|
|
return rdev_set_lbt_mode(rdev, wpan_dev, mode);
|
|
}
|
|
|
|
#define NL802154_FLAG_NEED_WPAN_PHY 0x01
|
|
#define NL802154_FLAG_NEED_NETDEV 0x02
|
|
#define NL802154_FLAG_NEED_RTNL 0x04
|
|
#define NL802154_FLAG_CHECK_NETDEV_UP 0x08
|
|
#define NL802154_FLAG_NEED_NETDEV_UP (NL802154_FLAG_NEED_NETDEV |\
|
|
NL802154_FLAG_CHECK_NETDEV_UP)
|
|
#define NL802154_FLAG_NEED_WPAN_DEV 0x10
|
|
#define NL802154_FLAG_NEED_WPAN_DEV_UP (NL802154_FLAG_NEED_WPAN_DEV |\
|
|
NL802154_FLAG_CHECK_NETDEV_UP)
|
|
|
|
static int nl802154_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
|
|
struct genl_info *info)
|
|
{
|
|
struct cfg802154_registered_device *rdev;
|
|
struct wpan_dev *wpan_dev;
|
|
struct net_device *dev;
|
|
bool rtnl = ops->internal_flags & NL802154_FLAG_NEED_RTNL;
|
|
|
|
if (rtnl)
|
|
rtnl_lock();
|
|
|
|
if (ops->internal_flags & NL802154_FLAG_NEED_WPAN_PHY) {
|
|
rdev = cfg802154_get_dev_from_info(genl_info_net(info), info);
|
|
if (IS_ERR(rdev)) {
|
|
if (rtnl)
|
|
rtnl_unlock();
|
|
return PTR_ERR(rdev);
|
|
}
|
|
info->user_ptr[0] = rdev;
|
|
} else if (ops->internal_flags & NL802154_FLAG_NEED_NETDEV ||
|
|
ops->internal_flags & NL802154_FLAG_NEED_WPAN_DEV) {
|
|
ASSERT_RTNL();
|
|
wpan_dev = __cfg802154_wpan_dev_from_attrs(genl_info_net(info),
|
|
info->attrs);
|
|
if (IS_ERR(wpan_dev)) {
|
|
if (rtnl)
|
|
rtnl_unlock();
|
|
return PTR_ERR(wpan_dev);
|
|
}
|
|
|
|
dev = wpan_dev->netdev;
|
|
rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy);
|
|
|
|
if (ops->internal_flags & NL802154_FLAG_NEED_NETDEV) {
|
|
if (!dev) {
|
|
if (rtnl)
|
|
rtnl_unlock();
|
|
return -EINVAL;
|
|
}
|
|
|
|
info->user_ptr[1] = dev;
|
|
} else {
|
|
info->user_ptr[1] = wpan_dev;
|
|
}
|
|
|
|
if (dev) {
|
|
if (ops->internal_flags & NL802154_FLAG_CHECK_NETDEV_UP &&
|
|
!netif_running(dev)) {
|
|
if (rtnl)
|
|
rtnl_unlock();
|
|
return -ENETDOWN;
|
|
}
|
|
|
|
dev_hold(dev);
|
|
}
|
|
|
|
info->user_ptr[0] = rdev;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
|
|
struct genl_info *info)
|
|
{
|
|
if (info->user_ptr[1]) {
|
|
if (ops->internal_flags & NL802154_FLAG_NEED_WPAN_DEV) {
|
|
struct wpan_dev *wpan_dev = info->user_ptr[1];
|
|
|
|
if (wpan_dev->netdev)
|
|
dev_put(wpan_dev->netdev);
|
|
} else {
|
|
dev_put(info->user_ptr[1]);
|
|
}
|
|
}
|
|
|
|
if (ops->internal_flags & NL802154_FLAG_NEED_RTNL)
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static const struct genl_ops nl802154_ops[] = {
|
|
{
|
|
.cmd = NL802154_CMD_GET_WPAN_PHY,
|
|
.doit = nl802154_get_wpan_phy,
|
|
.dumpit = nl802154_dump_wpan_phy,
|
|
.done = nl802154_dump_wpan_phy_done,
|
|
.policy = nl802154_policy,
|
|
/* can be retrieved by unprivileged users */
|
|
.internal_flags = NL802154_FLAG_NEED_WPAN_PHY |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_GET_INTERFACE,
|
|
.doit = nl802154_get_interface,
|
|
.dumpit = nl802154_dump_interface,
|
|
.policy = nl802154_policy,
|
|
/* can be retrieved by unprivileged users */
|
|
.internal_flags = NL802154_FLAG_NEED_WPAN_DEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_NEW_INTERFACE,
|
|
.doit = nl802154_new_interface,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_WPAN_PHY |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_DEL_INTERFACE,
|
|
.doit = nl802154_del_interface,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_WPAN_DEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_CHANNEL,
|
|
.doit = nl802154_set_channel,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_WPAN_PHY |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_CCA_MODE,
|
|
.doit = nl802154_set_cca_mode,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_WPAN_PHY |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_PAN_ID,
|
|
.doit = nl802154_set_pan_id,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_NETDEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_SHORT_ADDR,
|
|
.doit = nl802154_set_short_addr,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_NETDEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_BACKOFF_EXPONENT,
|
|
.doit = nl802154_set_backoff_exponent,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_NETDEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_MAX_CSMA_BACKOFFS,
|
|
.doit = nl802154_set_max_csma_backoffs,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_NETDEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_MAX_FRAME_RETRIES,
|
|
.doit = nl802154_set_max_frame_retries,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_NETDEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
{
|
|
.cmd = NL802154_CMD_SET_LBT_MODE,
|
|
.doit = nl802154_set_lbt_mode,
|
|
.policy = nl802154_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
.internal_flags = NL802154_FLAG_NEED_NETDEV |
|
|
NL802154_FLAG_NEED_RTNL,
|
|
},
|
|
};
|
|
|
|
/* initialisation/exit functions */
|
|
int nl802154_init(void)
|
|
{
|
|
return genl_register_family_with_ops_groups(&nl802154_fam, nl802154_ops,
|
|
nl802154_mcgrps);
|
|
}
|
|
|
|
void nl802154_exit(void)
|
|
{
|
|
genl_unregister_family(&nl802154_fam);
|
|
}
|