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![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>
114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_MLD_H
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#define LINUX_MLD_H
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#include <linux/in6.h>
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#include <linux/icmpv6.h>
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/* MLDv1 Query/Report/Done */
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struct mld_msg {
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struct icmp6hdr mld_hdr;
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struct in6_addr mld_mca;
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};
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#define mld_type mld_hdr.icmp6_type
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#define mld_code mld_hdr.icmp6_code
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#define mld_cksum mld_hdr.icmp6_cksum
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#define mld_maxdelay mld_hdr.icmp6_maxdelay
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#define mld_reserved mld_hdr.icmp6_dataun.un_data16[1]
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/* Multicast Listener Discovery version 2 headers */
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/* MLDv2 Report */
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struct mld2_grec {
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__u8 grec_type;
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__u8 grec_auxwords;
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__be16 grec_nsrcs;
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struct in6_addr grec_mca;
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struct in6_addr grec_src[0];
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};
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struct mld2_report {
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struct icmp6hdr mld2r_hdr;
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struct mld2_grec mld2r_grec[0];
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};
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#define mld2r_type mld2r_hdr.icmp6_type
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#define mld2r_resv1 mld2r_hdr.icmp6_code
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#define mld2r_cksum mld2r_hdr.icmp6_cksum
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#define mld2r_resv2 mld2r_hdr.icmp6_dataun.un_data16[0]
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#define mld2r_ngrec mld2r_hdr.icmp6_dataun.un_data16[1]
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/* MLDv2 Query */
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struct mld2_query {
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struct icmp6hdr mld2q_hdr;
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struct in6_addr mld2q_mca;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 mld2q_qrv:3,
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mld2q_suppress:1,
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mld2q_resv2:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 mld2q_resv2:4,
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mld2q_suppress:1,
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mld2q_qrv:3;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 mld2q_qqic;
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__be16 mld2q_nsrcs;
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struct in6_addr mld2q_srcs[0];
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};
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#define mld2q_type mld2q_hdr.icmp6_type
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#define mld2q_code mld2q_hdr.icmp6_code
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#define mld2q_cksum mld2q_hdr.icmp6_cksum
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#define mld2q_mrc mld2q_hdr.icmp6_maxdelay
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#define mld2q_resv1 mld2q_hdr.icmp6_dataun.un_data16[1]
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/* RFC3810, 5.1.3. Maximum Response Code:
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*
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* If Maximum Response Code >= 32768, Maximum Response Code represents a
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* floating-point value as follows:
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*
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* 0 1 2 3 4 5 6 7 8 9 A B C D E F
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |1| exp | mant |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define MLDV2_MRC_EXP(value) (((value) >> 12) & 0x0007)
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#define MLDV2_MRC_MAN(value) ((value) & 0x0fff)
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/* RFC3810, 5.1.9. QQIC (Querier's Query Interval Code):
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*
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* If QQIC >= 128, QQIC represents a floating-point value as follows:
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*
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* 0 1 2 3 4 5 6 7
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* +-+-+-+-+-+-+-+-+
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* |1| exp | mant |
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* +-+-+-+-+-+-+-+-+
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*/
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#define MLDV2_QQIC_EXP(value) (((value) >> 4) & 0x07)
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#define MLDV2_QQIC_MAN(value) ((value) & 0x0f)
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#define MLD_EXP_MIN_LIMIT 32768UL
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#define MLDV1_MRD_MAX_COMPAT (MLD_EXP_MIN_LIMIT - 1)
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static inline unsigned long mldv2_mrc(const struct mld2_query *mlh2)
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{
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/* RFC3810, 5.1.3. Maximum Response Code */
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unsigned long ret, mc_mrc = ntohs(mlh2->mld2q_mrc);
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if (mc_mrc < MLD_EXP_MIN_LIMIT) {
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ret = mc_mrc;
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} else {
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unsigned long mc_man, mc_exp;
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mc_exp = MLDV2_MRC_EXP(mc_mrc);
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mc_man = MLDV2_MRC_MAN(mc_mrc);
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ret = (mc_man | 0x1000) << (mc_exp + 3);
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}
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return ret;
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}
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#endif
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