![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1135 lines
25 KiB
C
1135 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* NETLINK Generic Netlink Family
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*
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* Authors: Jamal Hadi Salim
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* Thomas Graf <tgraf@suug.ch>
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* Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/string.h>
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#include <linux/skbuff.h>
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#include <linux/mutex.h>
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#include <linux/bitmap.h>
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#include <linux/rwsem.h>
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#include <linux/idr.h>
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#include <net/sock.h>
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#include <net/genetlink.h>
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static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */
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static DECLARE_RWSEM(cb_lock);
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atomic_t genl_sk_destructing_cnt = ATOMIC_INIT(0);
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DECLARE_WAIT_QUEUE_HEAD(genl_sk_destructing_waitq);
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void genl_lock(void)
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{
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mutex_lock(&genl_mutex);
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}
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EXPORT_SYMBOL(genl_lock);
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void genl_unlock(void)
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{
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mutex_unlock(&genl_mutex);
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}
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EXPORT_SYMBOL(genl_unlock);
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#ifdef CONFIG_LOCKDEP
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bool lockdep_genl_is_held(void)
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{
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return lockdep_is_held(&genl_mutex);
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}
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EXPORT_SYMBOL(lockdep_genl_is_held);
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#endif
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static void genl_lock_all(void)
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{
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down_write(&cb_lock);
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genl_lock();
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}
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static void genl_unlock_all(void)
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{
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genl_unlock();
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up_write(&cb_lock);
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}
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static DEFINE_IDR(genl_fam_idr);
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/*
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* Bitmap of multicast groups that are currently in use.
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*
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* To avoid an allocation at boot of just one unsigned long,
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* declare it global instead.
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* Bit 0 is marked as already used since group 0 is invalid.
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* Bit 1 is marked as already used since the drop-monitor code
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* abuses the API and thinks it can statically use group 1.
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* That group will typically conflict with other groups that
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* any proper users use.
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* Bit 16 is marked as used since it's used for generic netlink
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* and the code no longer marks pre-reserved IDs as used.
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* Bit 17 is marked as already used since the VFS quota code
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* also abused this API and relied on family == group ID, we
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* cater to that by giving it a static family and group ID.
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* Bit 18 is marked as already used since the PMCRAID driver
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* did the same thing as the VFS quota code (maybe copied?)
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*/
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static unsigned long mc_group_start = 0x3 | BIT(GENL_ID_CTRL) |
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BIT(GENL_ID_VFS_DQUOT) |
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BIT(GENL_ID_PMCRAID);
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static unsigned long *mc_groups = &mc_group_start;
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static unsigned long mc_groups_longs = 1;
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static int genl_ctrl_event(int event, const struct genl_family *family,
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const struct genl_multicast_group *grp,
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int grp_id);
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static const struct genl_family *genl_family_find_byid(unsigned int id)
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{
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return idr_find(&genl_fam_idr, id);
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}
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static const struct genl_family *genl_family_find_byname(char *name)
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{
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const struct genl_family *family;
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unsigned int id;
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idr_for_each_entry(&genl_fam_idr, family, id)
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if (strcmp(family->name, name) == 0)
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return family;
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return NULL;
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}
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static const struct genl_ops *genl_get_cmd(u8 cmd,
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const struct genl_family *family)
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{
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int i;
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for (i = 0; i < family->n_ops; i++)
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if (family->ops[i].cmd == cmd)
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return &family->ops[i];
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return NULL;
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}
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static int genl_allocate_reserve_groups(int n_groups, int *first_id)
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{
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unsigned long *new_groups;
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int start = 0;
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int i;
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int id;
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bool fits;
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do {
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if (start == 0)
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id = find_first_zero_bit(mc_groups,
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mc_groups_longs *
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BITS_PER_LONG);
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else
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id = find_next_zero_bit(mc_groups,
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mc_groups_longs * BITS_PER_LONG,
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start);
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fits = true;
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for (i = id;
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i < min_t(int, id + n_groups,
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mc_groups_longs * BITS_PER_LONG);
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i++) {
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if (test_bit(i, mc_groups)) {
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start = i;
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fits = false;
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break;
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}
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}
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if (id + n_groups > mc_groups_longs * BITS_PER_LONG) {
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unsigned long new_longs = mc_groups_longs +
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BITS_TO_LONGS(n_groups);
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size_t nlen = new_longs * sizeof(unsigned long);
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if (mc_groups == &mc_group_start) {
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new_groups = kzalloc(nlen, GFP_KERNEL);
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if (!new_groups)
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return -ENOMEM;
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mc_groups = new_groups;
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*mc_groups = mc_group_start;
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} else {
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new_groups = krealloc(mc_groups, nlen,
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GFP_KERNEL);
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if (!new_groups)
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return -ENOMEM;
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mc_groups = new_groups;
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for (i = 0; i < BITS_TO_LONGS(n_groups); i++)
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mc_groups[mc_groups_longs + i] = 0;
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}
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mc_groups_longs = new_longs;
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}
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} while (!fits);
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for (i = id; i < id + n_groups; i++)
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set_bit(i, mc_groups);
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*first_id = id;
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return 0;
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}
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static struct genl_family genl_ctrl;
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static int genl_validate_assign_mc_groups(struct genl_family *family)
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{
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int first_id;
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int n_groups = family->n_mcgrps;
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int err = 0, i;
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bool groups_allocated = false;
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if (!n_groups)
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return 0;
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for (i = 0; i < n_groups; i++) {
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const struct genl_multicast_group *grp = &family->mcgrps[i];
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if (WARN_ON(grp->name[0] == '\0'))
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return -EINVAL;
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if (WARN_ON(memchr(grp->name, '\0', GENL_NAMSIZ) == NULL))
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return -EINVAL;
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}
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/* special-case our own group and hacks */
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if (family == &genl_ctrl) {
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first_id = GENL_ID_CTRL;
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BUG_ON(n_groups != 1);
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} else if (strcmp(family->name, "NET_DM") == 0) {
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first_id = 1;
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BUG_ON(n_groups != 1);
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} else if (family->id == GENL_ID_VFS_DQUOT) {
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first_id = GENL_ID_VFS_DQUOT;
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BUG_ON(n_groups != 1);
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} else if (family->id == GENL_ID_PMCRAID) {
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first_id = GENL_ID_PMCRAID;
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BUG_ON(n_groups != 1);
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} else {
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groups_allocated = true;
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err = genl_allocate_reserve_groups(n_groups, &first_id);
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if (err)
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return err;
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}
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family->mcgrp_offset = first_id;
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/* if still initializing, can't and don't need to to realloc bitmaps */
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if (!init_net.genl_sock)
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return 0;
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if (family->netnsok) {
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struct net *net;
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netlink_table_grab();
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rcu_read_lock();
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for_each_net_rcu(net) {
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err = __netlink_change_ngroups(net->genl_sock,
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mc_groups_longs * BITS_PER_LONG);
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if (err) {
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/*
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* No need to roll back, can only fail if
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* memory allocation fails and then the
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* number of _possible_ groups has been
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* increased on some sockets which is ok.
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*/
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break;
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}
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}
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rcu_read_unlock();
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netlink_table_ungrab();
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} else {
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err = netlink_change_ngroups(init_net.genl_sock,
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mc_groups_longs * BITS_PER_LONG);
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}
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if (groups_allocated && err) {
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for (i = 0; i < family->n_mcgrps; i++)
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clear_bit(family->mcgrp_offset + i, mc_groups);
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}
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return err;
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}
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static void genl_unregister_mc_groups(const struct genl_family *family)
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{
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struct net *net;
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int i;
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netlink_table_grab();
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rcu_read_lock();
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for_each_net_rcu(net) {
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for (i = 0; i < family->n_mcgrps; i++)
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__netlink_clear_multicast_users(
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net->genl_sock, family->mcgrp_offset + i);
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}
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rcu_read_unlock();
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netlink_table_ungrab();
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for (i = 0; i < family->n_mcgrps; i++) {
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int grp_id = family->mcgrp_offset + i;
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if (grp_id != 1)
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clear_bit(grp_id, mc_groups);
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genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, family,
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&family->mcgrps[i], grp_id);
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}
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}
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static int genl_validate_ops(const struct genl_family *family)
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{
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const struct genl_ops *ops = family->ops;
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unsigned int n_ops = family->n_ops;
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int i, j;
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if (WARN_ON(n_ops && !ops))
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return -EINVAL;
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if (!n_ops)
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return 0;
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for (i = 0; i < n_ops; i++) {
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if (ops[i].dumpit == NULL && ops[i].doit == NULL)
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return -EINVAL;
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for (j = i + 1; j < n_ops; j++)
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if (ops[i].cmd == ops[j].cmd)
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return -EINVAL;
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}
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return 0;
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}
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/**
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* genl_register_family - register a generic netlink family
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* @family: generic netlink family
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*
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* Registers the specified family after validating it first. Only one
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* family may be registered with the same family name or identifier.
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*
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* The family's ops, multicast groups and module pointer must already
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* be assigned.
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*
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* Return 0 on success or a negative error code.
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*/
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int genl_register_family(struct genl_family *family)
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{
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int err, i;
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int start = GENL_START_ALLOC, end = GENL_MAX_ID;
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err = genl_validate_ops(family);
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if (err)
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return err;
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genl_lock_all();
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if (genl_family_find_byname(family->name)) {
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err = -EEXIST;
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goto errout_locked;
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}
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/*
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* Sadly, a few cases need to be special-cased
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* due to them having previously abused the API
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* and having used their family ID also as their
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* multicast group ID, so we use reserved IDs
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* for both to be sure we can do that mapping.
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*/
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if (family == &genl_ctrl) {
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/* and this needs to be special for initial family lookups */
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start = end = GENL_ID_CTRL;
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} else if (strcmp(family->name, "pmcraid") == 0) {
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start = end = GENL_ID_PMCRAID;
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} else if (strcmp(family->name, "VFS_DQUOT") == 0) {
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start = end = GENL_ID_VFS_DQUOT;
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}
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if (family->maxattr && !family->parallel_ops) {
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family->attrbuf = kmalloc((family->maxattr+1) *
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sizeof(struct nlattr *), GFP_KERNEL);
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if (family->attrbuf == NULL) {
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err = -ENOMEM;
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goto errout_locked;
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}
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} else
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family->attrbuf = NULL;
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family->id = idr_alloc(&genl_fam_idr, family,
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start, end + 1, GFP_KERNEL);
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if (family->id < 0) {
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err = family->id;
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goto errout_locked;
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}
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err = genl_validate_assign_mc_groups(family);
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if (err)
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goto errout_remove;
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genl_unlock_all();
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/* send all events */
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genl_ctrl_event(CTRL_CMD_NEWFAMILY, family, NULL, 0);
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for (i = 0; i < family->n_mcgrps; i++)
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genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, family,
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&family->mcgrps[i], family->mcgrp_offset + i);
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return 0;
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errout_remove:
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idr_remove(&genl_fam_idr, family->id);
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kfree(family->attrbuf);
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errout_locked:
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genl_unlock_all();
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return err;
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}
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EXPORT_SYMBOL(genl_register_family);
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/**
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* genl_unregister_family - unregister generic netlink family
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* @family: generic netlink family
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*
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* Unregisters the specified family.
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*
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* Returns 0 on success or a negative error code.
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*/
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int genl_unregister_family(const struct genl_family *family)
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{
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genl_lock_all();
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if (!genl_family_find_byid(family->id)) {
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genl_unlock_all();
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return -ENOENT;
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}
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genl_unregister_mc_groups(family);
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idr_remove(&genl_fam_idr, family->id);
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up_write(&cb_lock);
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wait_event(genl_sk_destructing_waitq,
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atomic_read(&genl_sk_destructing_cnt) == 0);
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genl_unlock();
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kfree(family->attrbuf);
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genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0);
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return 0;
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}
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EXPORT_SYMBOL(genl_unregister_family);
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/**
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* genlmsg_put - Add generic netlink header to netlink message
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* @skb: socket buffer holding the message
|
|
* @portid: netlink portid the message is addressed to
|
|
* @seq: sequence number (usually the one of the sender)
|
|
* @family: generic netlink family
|
|
* @flags: netlink message flags
|
|
* @cmd: generic netlink command
|
|
*
|
|
* Returns pointer to user specific header
|
|
*/
|
|
void *genlmsg_put(struct sk_buff *skb, u32 portid, u32 seq,
|
|
const struct genl_family *family, int flags, u8 cmd)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct genlmsghdr *hdr;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, family->id, GENL_HDRLEN +
|
|
family->hdrsize, flags);
|
|
if (nlh == NULL)
|
|
return NULL;
|
|
|
|
hdr = nlmsg_data(nlh);
|
|
hdr->cmd = cmd;
|
|
hdr->version = family->version;
|
|
hdr->reserved = 0;
|
|
|
|
return (char *) hdr + GENL_HDRLEN;
|
|
}
|
|
EXPORT_SYMBOL(genlmsg_put);
|
|
|
|
static int genl_lock_start(struct netlink_callback *cb)
|
|
{
|
|
/* our ops are always const - netlink API doesn't propagate that */
|
|
const struct genl_ops *ops = cb->data;
|
|
int rc = 0;
|
|
|
|
if (ops->start) {
|
|
genl_lock();
|
|
rc = ops->start(cb);
|
|
genl_unlock();
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int genl_lock_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
/* our ops are always const - netlink API doesn't propagate that */
|
|
const struct genl_ops *ops = cb->data;
|
|
int rc;
|
|
|
|
genl_lock();
|
|
rc = ops->dumpit(skb, cb);
|
|
genl_unlock();
|
|
return rc;
|
|
}
|
|
|
|
static int genl_lock_done(struct netlink_callback *cb)
|
|
{
|
|
/* our ops are always const - netlink API doesn't propagate that */
|
|
const struct genl_ops *ops = cb->data;
|
|
int rc = 0;
|
|
|
|
if (ops->done) {
|
|
genl_lock();
|
|
rc = ops->done(cb);
|
|
genl_unlock();
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int genl_family_rcv_msg(const struct genl_family *family,
|
|
struct sk_buff *skb,
|
|
struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct genl_ops *ops;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct genl_info info;
|
|
struct genlmsghdr *hdr = nlmsg_data(nlh);
|
|
struct nlattr **attrbuf;
|
|
int hdrlen, err;
|
|
|
|
/* this family doesn't exist in this netns */
|
|
if (!family->netnsok && !net_eq(net, &init_net))
|
|
return -ENOENT;
|
|
|
|
hdrlen = GENL_HDRLEN + family->hdrsize;
|
|
if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
|
|
return -EINVAL;
|
|
|
|
ops = genl_get_cmd(hdr->cmd, family);
|
|
if (ops == NULL)
|
|
return -EOPNOTSUPP;
|
|
|
|
if ((ops->flags & GENL_ADMIN_PERM) &&
|
|
!netlink_capable(skb, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if ((ops->flags & GENL_UNS_ADMIN_PERM) &&
|
|
!netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if ((nlh->nlmsg_flags & NLM_F_DUMP) == NLM_F_DUMP) {
|
|
int rc;
|
|
|
|
if (ops->dumpit == NULL)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!family->parallel_ops) {
|
|
struct netlink_dump_control c = {
|
|
.module = family->module,
|
|
/* we have const, but the netlink API doesn't */
|
|
.data = (void *)ops,
|
|
.start = genl_lock_start,
|
|
.dump = genl_lock_dumpit,
|
|
.done = genl_lock_done,
|
|
};
|
|
|
|
genl_unlock();
|
|
rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
|
|
genl_lock();
|
|
|
|
} else {
|
|
struct netlink_dump_control c = {
|
|
.module = family->module,
|
|
.start = ops->start,
|
|
.dump = ops->dumpit,
|
|
.done = ops->done,
|
|
};
|
|
|
|
rc = __netlink_dump_start(net->genl_sock, skb, nlh, &c);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
if (ops->doit == NULL)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (family->maxattr && family->parallel_ops) {
|
|
attrbuf = kmalloc((family->maxattr+1) *
|
|
sizeof(struct nlattr *), GFP_KERNEL);
|
|
if (attrbuf == NULL)
|
|
return -ENOMEM;
|
|
} else
|
|
attrbuf = family->attrbuf;
|
|
|
|
if (attrbuf) {
|
|
err = nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
|
|
ops->policy, extack);
|
|
if (err < 0)
|
|
goto out;
|
|
}
|
|
|
|
info.snd_seq = nlh->nlmsg_seq;
|
|
info.snd_portid = NETLINK_CB(skb).portid;
|
|
info.nlhdr = nlh;
|
|
info.genlhdr = nlmsg_data(nlh);
|
|
info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
|
|
info.attrs = attrbuf;
|
|
info.extack = extack;
|
|
genl_info_net_set(&info, net);
|
|
memset(&info.user_ptr, 0, sizeof(info.user_ptr));
|
|
|
|
if (family->pre_doit) {
|
|
err = family->pre_doit(ops, skb, &info);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
err = ops->doit(skb, &info);
|
|
|
|
if (family->post_doit)
|
|
family->post_doit(ops, skb, &info);
|
|
|
|
out:
|
|
if (family->parallel_ops)
|
|
kfree(attrbuf);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
const struct genl_family *family;
|
|
int err;
|
|
|
|
family = genl_family_find_byid(nlh->nlmsg_type);
|
|
if (family == NULL)
|
|
return -ENOENT;
|
|
|
|
if (!family->parallel_ops)
|
|
genl_lock();
|
|
|
|
err = genl_family_rcv_msg(family, skb, nlh, extack);
|
|
|
|
if (!family->parallel_ops)
|
|
genl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static void genl_rcv(struct sk_buff *skb)
|
|
{
|
|
down_read(&cb_lock);
|
|
netlink_rcv_skb(skb, &genl_rcv_msg);
|
|
up_read(&cb_lock);
|
|
}
|
|
|
|
/**************************************************************************
|
|
* Controller
|
|
**************************************************************************/
|
|
|
|
static struct genl_family genl_ctrl;
|
|
|
|
static int ctrl_fill_info(const struct genl_family *family, u32 portid, u32 seq,
|
|
u32 flags, struct sk_buff *skb, u8 cmd)
|
|
{
|
|
void *hdr;
|
|
|
|
hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd);
|
|
if (hdr == NULL)
|
|
return -1;
|
|
|
|
if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||
|
|
nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id) ||
|
|
nla_put_u32(skb, CTRL_ATTR_VERSION, family->version) ||
|
|
nla_put_u32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize) ||
|
|
nla_put_u32(skb, CTRL_ATTR_MAXATTR, family->maxattr))
|
|
goto nla_put_failure;
|
|
|
|
if (family->n_ops) {
|
|
struct nlattr *nla_ops;
|
|
int i;
|
|
|
|
nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS);
|
|
if (nla_ops == NULL)
|
|
goto nla_put_failure;
|
|
|
|
for (i = 0; i < family->n_ops; i++) {
|
|
struct nlattr *nest;
|
|
const struct genl_ops *ops = &family->ops[i];
|
|
u32 op_flags = ops->flags;
|
|
|
|
if (ops->dumpit)
|
|
op_flags |= GENL_CMD_CAP_DUMP;
|
|
if (ops->doit)
|
|
op_flags |= GENL_CMD_CAP_DO;
|
|
if (ops->policy)
|
|
op_flags |= GENL_CMD_CAP_HASPOL;
|
|
|
|
nest = nla_nest_start(skb, i + 1);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, CTRL_ATTR_OP_ID, ops->cmd) ||
|
|
nla_put_u32(skb, CTRL_ATTR_OP_FLAGS, op_flags))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
|
|
nla_nest_end(skb, nla_ops);
|
|
}
|
|
|
|
if (family->n_mcgrps) {
|
|
struct nlattr *nla_grps;
|
|
int i;
|
|
|
|
nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS);
|
|
if (nla_grps == NULL)
|
|
goto nla_put_failure;
|
|
|
|
for (i = 0; i < family->n_mcgrps; i++) {
|
|
struct nlattr *nest;
|
|
const struct genl_multicast_group *grp;
|
|
|
|
grp = &family->mcgrps[i];
|
|
|
|
nest = nla_nest_start(skb, i + 1);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID,
|
|
family->mcgrp_offset + i) ||
|
|
nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME,
|
|
grp->name))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
}
|
|
nla_nest_end(skb, nla_grps);
|
|
}
|
|
|
|
genlmsg_end(skb, hdr);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
genlmsg_cancel(skb, hdr);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int ctrl_fill_mcgrp_info(const struct genl_family *family,
|
|
const struct genl_multicast_group *grp,
|
|
int grp_id, u32 portid, u32 seq, u32 flags,
|
|
struct sk_buff *skb, u8 cmd)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *nla_grps;
|
|
struct nlattr *nest;
|
|
|
|
hdr = genlmsg_put(skb, portid, seq, &genl_ctrl, flags, cmd);
|
|
if (hdr == NULL)
|
|
return -1;
|
|
|
|
if (nla_put_string(skb, CTRL_ATTR_FAMILY_NAME, family->name) ||
|
|
nla_put_u16(skb, CTRL_ATTR_FAMILY_ID, family->id))
|
|
goto nla_put_failure;
|
|
|
|
nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS);
|
|
if (nla_grps == NULL)
|
|
goto nla_put_failure;
|
|
|
|
nest = nla_nest_start(skb, 1);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, CTRL_ATTR_MCAST_GRP_ID, grp_id) ||
|
|
nla_put_string(skb, CTRL_ATTR_MCAST_GRP_NAME,
|
|
grp->name))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
nla_nest_end(skb, nla_grps);
|
|
|
|
genlmsg_end(skb, hdr);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
genlmsg_cancel(skb, hdr);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int n = 0;
|
|
struct genl_family *rt;
|
|
struct net *net = sock_net(skb->sk);
|
|
int fams_to_skip = cb->args[0];
|
|
unsigned int id;
|
|
|
|
idr_for_each_entry(&genl_fam_idr, rt, id) {
|
|
if (!rt->netnsok && !net_eq(net, &init_net))
|
|
continue;
|
|
|
|
if (n++ < fams_to_skip)
|
|
continue;
|
|
|
|
if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
skb, CTRL_CMD_NEWFAMILY) < 0) {
|
|
n--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
cb->args[0] = n;
|
|
return skb->len;
|
|
}
|
|
|
|
static struct sk_buff *ctrl_build_family_msg(const struct genl_family *family,
|
|
u32 portid, int seq, u8 cmd)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
return ERR_PTR(-ENOBUFS);
|
|
|
|
err = ctrl_fill_info(family, portid, seq, 0, skb, cmd);
|
|
if (err < 0) {
|
|
nlmsg_free(skb);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
static struct sk_buff *
|
|
ctrl_build_mcgrp_msg(const struct genl_family *family,
|
|
const struct genl_multicast_group *grp,
|
|
int grp_id, u32 portid, int seq, u8 cmd)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err;
|
|
|
|
skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
return ERR_PTR(-ENOBUFS);
|
|
|
|
err = ctrl_fill_mcgrp_info(family, grp, grp_id, portid,
|
|
seq, 0, skb, cmd);
|
|
if (err < 0) {
|
|
nlmsg_free(skb);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
return skb;
|
|
}
|
|
|
|
static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = {
|
|
[CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 },
|
|
[CTRL_ATTR_FAMILY_NAME] = { .type = NLA_NUL_STRING,
|
|
.len = GENL_NAMSIZ - 1 },
|
|
};
|
|
|
|
static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct sk_buff *msg;
|
|
const struct genl_family *res = NULL;
|
|
int err = -EINVAL;
|
|
|
|
if (info->attrs[CTRL_ATTR_FAMILY_ID]) {
|
|
u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]);
|
|
res = genl_family_find_byid(id);
|
|
err = -ENOENT;
|
|
}
|
|
|
|
if (info->attrs[CTRL_ATTR_FAMILY_NAME]) {
|
|
char *name;
|
|
|
|
name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]);
|
|
res = genl_family_find_byname(name);
|
|
#ifdef CONFIG_MODULES
|
|
if (res == NULL) {
|
|
genl_unlock();
|
|
up_read(&cb_lock);
|
|
request_module("net-pf-%d-proto-%d-family-%s",
|
|
PF_NETLINK, NETLINK_GENERIC, name);
|
|
down_read(&cb_lock);
|
|
genl_lock();
|
|
res = genl_family_find_byname(name);
|
|
}
|
|
#endif
|
|
err = -ENOENT;
|
|
}
|
|
|
|
if (res == NULL)
|
|
return err;
|
|
|
|
if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) {
|
|
/* family doesn't exist here */
|
|
return -ENOENT;
|
|
}
|
|
|
|
msg = ctrl_build_family_msg(res, info->snd_portid, info->snd_seq,
|
|
CTRL_CMD_NEWFAMILY);
|
|
if (IS_ERR(msg))
|
|
return PTR_ERR(msg);
|
|
|
|
return genlmsg_reply(msg, info);
|
|
}
|
|
|
|
static int genl_ctrl_event(int event, const struct genl_family *family,
|
|
const struct genl_multicast_group *grp,
|
|
int grp_id)
|
|
{
|
|
struct sk_buff *msg;
|
|
|
|
/* genl is still initialising */
|
|
if (!init_net.genl_sock)
|
|
return 0;
|
|
|
|
switch (event) {
|
|
case CTRL_CMD_NEWFAMILY:
|
|
case CTRL_CMD_DELFAMILY:
|
|
WARN_ON(grp);
|
|
msg = ctrl_build_family_msg(family, 0, 0, event);
|
|
break;
|
|
case CTRL_CMD_NEWMCAST_GRP:
|
|
case CTRL_CMD_DELMCAST_GRP:
|
|
BUG_ON(!grp);
|
|
msg = ctrl_build_mcgrp_msg(family, grp, grp_id, 0, 0, event);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (IS_ERR(msg))
|
|
return PTR_ERR(msg);
|
|
|
|
if (!family->netnsok) {
|
|
genlmsg_multicast_netns(&genl_ctrl, &init_net, msg, 0,
|
|
0, GFP_KERNEL);
|
|
} else {
|
|
rcu_read_lock();
|
|
genlmsg_multicast_allns(&genl_ctrl, msg, 0,
|
|
0, GFP_ATOMIC);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct genl_ops genl_ctrl_ops[] = {
|
|
{
|
|
.cmd = CTRL_CMD_GETFAMILY,
|
|
.doit = ctrl_getfamily,
|
|
.dumpit = ctrl_dumpfamily,
|
|
.policy = ctrl_policy,
|
|
},
|
|
};
|
|
|
|
static const struct genl_multicast_group genl_ctrl_groups[] = {
|
|
{ .name = "notify", },
|
|
};
|
|
|
|
static struct genl_family genl_ctrl __ro_after_init = {
|
|
.module = THIS_MODULE,
|
|
.ops = genl_ctrl_ops,
|
|
.n_ops = ARRAY_SIZE(genl_ctrl_ops),
|
|
.mcgrps = genl_ctrl_groups,
|
|
.n_mcgrps = ARRAY_SIZE(genl_ctrl_groups),
|
|
.id = GENL_ID_CTRL,
|
|
.name = "nlctrl",
|
|
.version = 0x2,
|
|
.maxattr = CTRL_ATTR_MAX,
|
|
.netnsok = true,
|
|
};
|
|
|
|
static int genl_bind(struct net *net, int group)
|
|
{
|
|
struct genl_family *f;
|
|
int err = -ENOENT;
|
|
unsigned int id;
|
|
|
|
down_read(&cb_lock);
|
|
|
|
idr_for_each_entry(&genl_fam_idr, f, id) {
|
|
if (group >= f->mcgrp_offset &&
|
|
group < f->mcgrp_offset + f->n_mcgrps) {
|
|
int fam_grp = group - f->mcgrp_offset;
|
|
|
|
if (!f->netnsok && net != &init_net)
|
|
err = -ENOENT;
|
|
else if (f->mcast_bind)
|
|
err = f->mcast_bind(net, fam_grp);
|
|
else
|
|
err = 0;
|
|
break;
|
|
}
|
|
}
|
|
up_read(&cb_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void genl_unbind(struct net *net, int group)
|
|
{
|
|
struct genl_family *f;
|
|
unsigned int id;
|
|
|
|
down_read(&cb_lock);
|
|
|
|
idr_for_each_entry(&genl_fam_idr, f, id) {
|
|
if (group >= f->mcgrp_offset &&
|
|
group < f->mcgrp_offset + f->n_mcgrps) {
|
|
int fam_grp = group - f->mcgrp_offset;
|
|
|
|
if (f->mcast_unbind)
|
|
f->mcast_unbind(net, fam_grp);
|
|
break;
|
|
}
|
|
}
|
|
up_read(&cb_lock);
|
|
}
|
|
|
|
static int __net_init genl_pernet_init(struct net *net)
|
|
{
|
|
struct netlink_kernel_cfg cfg = {
|
|
.input = genl_rcv,
|
|
.flags = NL_CFG_F_NONROOT_RECV,
|
|
.bind = genl_bind,
|
|
.unbind = genl_unbind,
|
|
};
|
|
|
|
/* we'll bump the group number right afterwards */
|
|
net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, &cfg);
|
|
|
|
if (!net->genl_sock && net_eq(net, &init_net))
|
|
panic("GENL: Cannot initialize generic netlink\n");
|
|
|
|
if (!net->genl_sock)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit genl_pernet_exit(struct net *net)
|
|
{
|
|
netlink_kernel_release(net->genl_sock);
|
|
net->genl_sock = NULL;
|
|
}
|
|
|
|
static struct pernet_operations genl_pernet_ops = {
|
|
.init = genl_pernet_init,
|
|
.exit = genl_pernet_exit,
|
|
};
|
|
|
|
static int __init genl_init(void)
|
|
{
|
|
int err;
|
|
|
|
err = genl_register_family(&genl_ctrl);
|
|
if (err < 0)
|
|
goto problem;
|
|
|
|
err = register_pernet_subsys(&genl_pernet_ops);
|
|
if (err)
|
|
goto problem;
|
|
|
|
return 0;
|
|
|
|
problem:
|
|
panic("GENL: Cannot register controller: %d\n", err);
|
|
}
|
|
|
|
subsys_initcall(genl_init);
|
|
|
|
/**
|
|
* genl_family_attrbuf - return family's attrbuf
|
|
* @family: the family
|
|
*
|
|
* Return the family's attrbuf, while validating that it's
|
|
* actually valid to access it.
|
|
*
|
|
* You cannot use this function with a family that has parallel_ops
|
|
* and you can only use it within (pre/post) doit/dumpit callbacks.
|
|
*/
|
|
struct nlattr **genl_family_attrbuf(const struct genl_family *family)
|
|
{
|
|
if (!WARN_ON(family->parallel_ops))
|
|
lockdep_assert_held(&genl_mutex);
|
|
|
|
return family->attrbuf;
|
|
}
|
|
EXPORT_SYMBOL(genl_family_attrbuf);
|
|
|
|
static int genlmsg_mcast(struct sk_buff *skb, u32 portid, unsigned long group,
|
|
gfp_t flags)
|
|
{
|
|
struct sk_buff *tmp;
|
|
struct net *net, *prev = NULL;
|
|
int err;
|
|
|
|
for_each_net_rcu(net) {
|
|
if (prev) {
|
|
tmp = skb_clone(skb, flags);
|
|
if (!tmp) {
|
|
err = -ENOMEM;
|
|
goto error;
|
|
}
|
|
err = nlmsg_multicast(prev->genl_sock, tmp,
|
|
portid, group, flags);
|
|
if (err)
|
|
goto error;
|
|
}
|
|
|
|
prev = net;
|
|
}
|
|
|
|
return nlmsg_multicast(prev->genl_sock, skb, portid, group, flags);
|
|
error:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
int genlmsg_multicast_allns(const struct genl_family *family,
|
|
struct sk_buff *skb, u32 portid,
|
|
unsigned int group, gfp_t flags)
|
|
{
|
|
if (WARN_ON_ONCE(group >= family->n_mcgrps))
|
|
return -EINVAL;
|
|
group = family->mcgrp_offset + group;
|
|
return genlmsg_mcast(skb, portid, group, flags);
|
|
}
|
|
EXPORT_SYMBOL(genlmsg_multicast_allns);
|
|
|
|
void genl_notify(const struct genl_family *family, struct sk_buff *skb,
|
|
struct genl_info *info, u32 group, gfp_t flags)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
struct sock *sk = net->genl_sock;
|
|
int report = 0;
|
|
|
|
if (info->nlhdr)
|
|
report = nlmsg_report(info->nlhdr);
|
|
|
|
if (WARN_ON_ONCE(group >= family->n_mcgrps))
|
|
return;
|
|
group = family->mcgrp_offset + group;
|
|
nlmsg_notify(sk, skb, info->snd_portid, group, report, flags);
|
|
}
|
|
EXPORT_SYMBOL(genl_notify);
|