| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Netlink inteface for IEEE 802.15.4 stack |
| 3 | * |
| 4 | * Copyright 2007, 2008 Siemens AG |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Written by: |
| 20 | * Sergey Lapin <slapin@ossfans.org> |
| 21 | * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> |
| 22 | * Maxim Osipov <maxim.osipov@siemens.com> |
| 23 | */ |
| 24 | |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/gfp.h> |
| 27 | #include <net/genetlink.h> |
| 28 | #include <linux/nl802154.h> |
| 29 | |
| 30 | #include "ieee802154.h" |
| 31 | |
| 32 | static unsigned int ieee802154_seq_num; |
| 33 | static DEFINE_SPINLOCK(ieee802154_seq_lock); |
| 34 | |
| 35 | struct genl_family nl802154_family = { |
| 36 | .id = GENL_ID_GENERATE, |
| 37 | .hdrsize = 0, |
| 38 | .name = IEEE802154_NL_NAME, |
| 39 | .version = 1, |
| 40 | .maxattr = IEEE802154_ATTR_MAX, |
| 41 | }; |
| 42 | |
| 43 | /* Requests to userspace */ |
| 44 | struct sk_buff *ieee802154_nl_create(int flags, u8 req) |
| 45 | { |
| 46 | void *hdr; |
| 47 | struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 48 | unsigned long f; |
| 49 | |
| 50 | if (!msg) |
| 51 | return NULL; |
| 52 | |
| 53 | spin_lock_irqsave(&ieee802154_seq_lock, f); |
| 54 | hdr = genlmsg_put(msg, 0, ieee802154_seq_num++, |
| 55 | &nl802154_family, flags, req); |
| 56 | spin_unlock_irqrestore(&ieee802154_seq_lock, f); |
| 57 | if (!hdr) { |
| 58 | nlmsg_free(msg); |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | return msg; |
| 63 | } |
| 64 | |
| 65 | int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group) |
| 66 | { |
| 67 | /* XXX: nlh is right at the start of msg */ |
| 68 | void *hdr = genlmsg_data(NLMSG_DATA(msg->data)); |
| 69 | |
| 70 | if (genlmsg_end(msg, hdr) < 0) |
| 71 | goto out; |
| 72 | |
| 73 | return genlmsg_multicast(msg, 0, group, GFP_ATOMIC); |
| 74 | out: |
| 75 | nlmsg_free(msg); |
| 76 | return -ENOBUFS; |
| 77 | } |
| 78 | |
| 79 | struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info, |
| 80 | int flags, u8 req) |
| 81 | { |
| 82 | void *hdr; |
| 83 | struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); |
| 84 | |
| 85 | if (!msg) |
| 86 | return NULL; |
| 87 | |
| 88 | hdr = genlmsg_put_reply(msg, info, |
| 89 | &nl802154_family, flags, req); |
| 90 | if (!hdr) { |
| 91 | nlmsg_free(msg); |
| 92 | return NULL; |
| 93 | } |
| 94 | |
| 95 | return msg; |
| 96 | } |
| 97 | |
| 98 | int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info) |
| 99 | { |
| 100 | /* XXX: nlh is right at the start of msg */ |
| 101 | void *hdr = genlmsg_data(NLMSG_DATA(msg->data)); |
| 102 | |
| 103 | if (genlmsg_end(msg, hdr) < 0) |
| 104 | goto out; |
| 105 | |
| 106 | return genlmsg_reply(msg, info); |
| 107 | out: |
| 108 | nlmsg_free(msg); |
| 109 | return -ENOBUFS; |
| 110 | } |
| 111 | |
| 112 | int __init ieee802154_nl_init(void) |
| 113 | { |
| 114 | int rc; |
| 115 | |
| 116 | rc = genl_register_family(&nl802154_family); |
| 117 | if (rc) |
| 118 | goto fail; |
| 119 | |
| 120 | rc = nl802154_mac_register(); |
| 121 | if (rc) |
| 122 | goto fail; |
| 123 | |
| 124 | rc = nl802154_phy_register(); |
| 125 | if (rc) |
| 126 | goto fail; |
| 127 | |
| 128 | return 0; |
| 129 | |
| 130 | fail: |
| 131 | genl_unregister_family(&nl802154_family); |
| 132 | return rc; |
| 133 | } |
| 134 | |
| 135 | void __exit ieee802154_nl_exit(void) |
| 136 | { |
| 137 | genl_unregister_family(&nl802154_family); |
| 138 | } |
| 139 | |