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linux/include/net/ndisc.h
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
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>
2017-11-02 11:10:55 +01:00

464 lines
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NDISC_H
#define _NDISC_H
/*
* ICMP codes for neighbour discovery messages
*/
#define NDISC_ROUTER_SOLICITATION 133
#define NDISC_ROUTER_ADVERTISEMENT 134
#define NDISC_NEIGHBOUR_SOLICITATION 135
#define NDISC_NEIGHBOUR_ADVERTISEMENT 136
#define NDISC_REDIRECT 137
/*
* Router type: cross-layer information from link-layer to
* IPv6 layer reported by certain link types (e.g., RFC4214).
*/
#define NDISC_NODETYPE_UNSPEC 0 /* unspecified (default) */
#define NDISC_NODETYPE_HOST 1 /* host or unauthorized router */
#define NDISC_NODETYPE_NODEFAULT 2 /* non-default router */
#define NDISC_NODETYPE_DEFAULT 3 /* default router */
/*
* ndisc options
*/
enum {
__ND_OPT_PREFIX_INFO_END = 0,
ND_OPT_SOURCE_LL_ADDR = 1, /* RFC2461 */
ND_OPT_TARGET_LL_ADDR = 2, /* RFC2461 */
ND_OPT_PREFIX_INFO = 3, /* RFC2461 */
ND_OPT_REDIRECT_HDR = 4, /* RFC2461 */
ND_OPT_MTU = 5, /* RFC2461 */
ND_OPT_NONCE = 14, /* RFC7527 */
__ND_OPT_ARRAY_MAX,
ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
ND_OPT_RDNSS = 25, /* RFC5006 */
ND_OPT_DNSSL = 31, /* RFC6106 */
ND_OPT_6CO = 34, /* RFC6775 */
__ND_OPT_MAX
};
#define MAX_RTR_SOLICITATION_DELAY HZ
#define ND_REACHABLE_TIME (30*HZ)
#define ND_RETRANS_TIMER HZ
#include <linux/compiler.h>
#include <linux/icmpv6.h>
#include <linux/in6.h>
#include <linux/types.h>
#include <linux/if_arp.h>
#include <linux/netdevice.h>
#include <linux/hash.h>
#include <net/neighbour.h>
/* Set to 3 to get tracing... */
#define ND_DEBUG 1
#define ND_PRINTK(val, level, fmt, ...) \
do { \
if (val <= ND_DEBUG) \
net_##level##_ratelimited(fmt, ##__VA_ARGS__); \
} while (0)
struct ctl_table;
struct inet6_dev;
struct net_device;
struct net_proto_family;
struct sk_buff;
struct prefix_info;
extern struct neigh_table nd_tbl;
struct nd_msg {
struct icmp6hdr icmph;
struct in6_addr target;
__u8 opt[0];
};
struct rs_msg {
struct icmp6hdr icmph;
__u8 opt[0];
};
struct ra_msg {
struct icmp6hdr icmph;
__be32 reachable_time;
__be32 retrans_timer;
};
struct rd_msg {
struct icmp6hdr icmph;
struct in6_addr target;
struct in6_addr dest;
__u8 opt[0];
};
struct nd_opt_hdr {
__u8 nd_opt_type;
__u8 nd_opt_len;
} __packed;
/* ND options */
struct ndisc_options {
struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
#ifdef CONFIG_IPV6_ROUTE_INFO
struct nd_opt_hdr *nd_opts_ri;
struct nd_opt_hdr *nd_opts_ri_end;
#endif
struct nd_opt_hdr *nd_useropts;
struct nd_opt_hdr *nd_useropts_end;
#if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
struct nd_opt_hdr *nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR + 1];
#endif
};
#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
#define nd_opts_nonce nd_opt_array[ND_OPT_NONCE]
#define nd_802154_opts_src_lladdr nd_802154_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_802154_opts_tgt_lladdr nd_802154_opt_array[ND_OPT_TARGET_LL_ADDR]
#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
struct ndisc_options *ndisc_parse_options(const struct net_device *dev,
u8 *opt, int opt_len,
struct ndisc_options *ndopts);
void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
int data_len, int pad);
#define NDISC_OPS_REDIRECT_DATA_SPACE 2
/*
* This structure defines the hooks for IPv6 neighbour discovery.
* The following hooks can be defined; unless noted otherwise, they are
* optional and can be filled with a null pointer.
*
* int (*is_useropt)(u8 nd_opt_type):
* This function is called when IPv6 decide RA userspace options. if
* this function returns 1 then the option given by nd_opt_type will
* be handled as userspace option additional to the IPv6 options.
*
* int (*parse_options)(const struct net_device *dev,
* struct nd_opt_hdr *nd_opt,
* struct ndisc_options *ndopts):
* This function is called while parsing ndisc ops and put each position
* as pointer into ndopts. If this function return unequal 0, then this
* function took care about the ndisc option, if 0 then the IPv6 ndisc
* option parser will take care about that option.
*
* void (*update)(const struct net_device *dev, struct neighbour *n,
* u32 flags, u8 icmp6_type,
* const struct ndisc_options *ndopts):
* This function is called when IPv6 ndisc updates the neighbour cache
* entry. Additional options which can be updated may be previously
* parsed by parse_opts callback and accessible over ndopts parameter.
*
* int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
* struct neighbour *neigh, u8 *ha_buf,
* u8 **ha):
* This function is called when the necessary option space will be
* calculated before allocating a skb. The parameters neigh, ha_buf
* abd ha are available on NDISC_REDIRECT messages only.
*
* void (*fill_addr_option)(const struct net_device *dev,
* struct sk_buff *skb, u8 icmp6_type,
* const u8 *ha):
* This function is called when the skb will finally fill the option
* fields inside skb. NOTE: this callback should fill the option
* fields to the skb which are previously indicated by opt_space
* parameter. That means the decision to add such option should
* not lost between these two callbacks, e.g. protected by interface
* up state.
*
* void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
* const struct prefix_info *pinfo,
* struct inet6_dev *in6_dev,
* struct in6_addr *addr,
* int addr_type, u32 addr_flags,
* bool sllao, bool tokenized,
* __u32 valid_lft, u32 prefered_lft,
* bool dev_addr_generated):
* This function is called when a RA messages is received with valid
* PIO option fields and an IPv6 address will be added to the interface
* for autoconfiguration. The parameter dev_addr_generated reports about
* if the address was based on dev->dev_addr or not. This can be used
* to add a second address if link-layer operates with two link layer
* addresses. E.g. 802.15.4 6LoWPAN.
*/
struct ndisc_ops {
int (*is_useropt)(u8 nd_opt_type);
int (*parse_options)(const struct net_device *dev,
struct nd_opt_hdr *nd_opt,
struct ndisc_options *ndopts);
void (*update)(const struct net_device *dev, struct neighbour *n,
u32 flags, u8 icmp6_type,
const struct ndisc_options *ndopts);
int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
struct neighbour *neigh, u8 *ha_buf,
u8 **ha);
void (*fill_addr_option)(const struct net_device *dev,
struct sk_buff *skb, u8 icmp6_type,
const u8 *ha);
void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
const struct prefix_info *pinfo,
struct inet6_dev *in6_dev,
struct in6_addr *addr,
int addr_type, u32 addr_flags,
bool sllao, bool tokenized,
__u32 valid_lft, u32 prefered_lft,
bool dev_addr_generated);
};
#if IS_ENABLED(CONFIG_IPV6)
static inline int ndisc_ops_is_useropt(const struct net_device *dev,
u8 nd_opt_type)
{
if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
return dev->ndisc_ops->is_useropt(nd_opt_type);
else
return 0;
}
static inline int ndisc_ops_parse_options(const struct net_device *dev,
struct nd_opt_hdr *nd_opt,
struct ndisc_options *ndopts)
{
if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
else
return 0;
}
static inline void ndisc_ops_update(const struct net_device *dev,
struct neighbour *n, u32 flags,
u8 icmp6_type,
const struct ndisc_options *ndopts)
{
if (dev->ndisc_ops && dev->ndisc_ops->update)
dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
}
static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
u8 icmp6_type)
{
if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
icmp6_type != NDISC_REDIRECT)
return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
NULL, NULL);
else
return 0;
}
static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
struct neighbour *neigh,
u8 *ha_buf, u8 **ha)
{
if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
neigh, ha_buf, ha);
else
return 0;
}
static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
struct sk_buff *skb,
u8 icmp6_type)
{
if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
icmp6_type != NDISC_REDIRECT)
dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
}
static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
struct sk_buff *skb,
const u8 *ha)
{
if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
}
static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
struct net_device *dev,
const struct prefix_info *pinfo,
struct inet6_dev *in6_dev,
struct in6_addr *addr,
int addr_type, u32 addr_flags,
bool sllao, bool tokenized,
__u32 valid_lft,
u32 prefered_lft,
bool dev_addr_generated)
{
if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
addr, addr_type,
addr_flags, sllao,
tokenized, valid_lft,
prefered_lft,
dev_addr_generated);
}
#endif
/*
* Return the padding between the option length and the start of the
* link addr. Currently only IP-over-InfiniBand needs this, although
* if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
* also need a pad of 2.
*/
static inline int ndisc_addr_option_pad(unsigned short type)
{
switch (type) {
case ARPHRD_INFINIBAND: return 2;
default: return 0;
}
}
static inline int __ndisc_opt_addr_space(unsigned char addr_len, int pad)
{
return NDISC_OPT_SPACE(addr_len + pad);
}
#if IS_ENABLED(CONFIG_IPV6)
static inline int ndisc_opt_addr_space(struct net_device *dev, u8 icmp6_type)
{
return __ndisc_opt_addr_space(dev->addr_len,
ndisc_addr_option_pad(dev->type)) +
ndisc_ops_opt_addr_space(dev, icmp6_type);
}
static inline int ndisc_redirect_opt_addr_space(struct net_device *dev,
struct neighbour *neigh,
u8 *ops_data_buf,
u8 **ops_data)
{
return __ndisc_opt_addr_space(dev->addr_len,
ndisc_addr_option_pad(dev->type)) +
ndisc_ops_redirect_opt_addr_space(dev, neigh, ops_data_buf,
ops_data);
}
#endif
static inline u8 *__ndisc_opt_addr_data(struct nd_opt_hdr *p,
unsigned char addr_len, int prepad)
{
u8 *lladdr = (u8 *)(p + 1);
int lladdrlen = p->nd_opt_len << 3;
if (lladdrlen != __ndisc_opt_addr_space(addr_len, prepad))
return NULL;
return lladdr + prepad;
}
static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
struct net_device *dev)
{
return __ndisc_opt_addr_data(p, dev->addr_len,
ndisc_addr_option_pad(dev->type));
}
static inline u32 ndisc_hashfn(const void *pkey, const struct net_device *dev, __u32 *hash_rnd)
{
const u32 *p32 = pkey;
return (((p32[0] ^ hash32_ptr(dev)) * hash_rnd[0]) +
(p32[1] * hash_rnd[1]) +
(p32[2] * hash_rnd[2]) +
(p32[3] * hash_rnd[3]));
}
static inline struct neighbour *__ipv6_neigh_lookup_noref(struct net_device *dev, const void *pkey)
{
return ___neigh_lookup_noref(&nd_tbl, neigh_key_eq128, ndisc_hashfn, pkey, dev);
}
static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, const void *pkey)
{
struct neighbour *n;
rcu_read_lock_bh();
n = __ipv6_neigh_lookup_noref(dev, pkey);
if (n && !refcount_inc_not_zero(&n->refcnt))
n = NULL;
rcu_read_unlock_bh();
return n;
}
static inline void __ipv6_confirm_neigh(struct net_device *dev,
const void *pkey)
{
struct neighbour *n;
rcu_read_lock_bh();
n = __ipv6_neigh_lookup_noref(dev, pkey);
if (n) {
unsigned long now = jiffies;
/* avoid dirtying neighbour */
if (n->confirmed != now)
n->confirmed = now;
}
rcu_read_unlock_bh();
}
int ndisc_init(void);
int ndisc_late_init(void);
void ndisc_late_cleanup(void);
void ndisc_cleanup(void);
int ndisc_rcv(struct sk_buff *skb);
void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit,
const struct in6_addr *daddr, const struct in6_addr *saddr,
u64 nonce);
void ndisc_send_rs(struct net_device *dev,
const struct in6_addr *saddr, const struct in6_addr *daddr);
void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr,
const struct in6_addr *solicited_addr,
bool router, bool solicited, bool override, bool inc_opt);
void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target);
int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev,
int dir);
void ndisc_update(const struct net_device *dev, struct neighbour *neigh,
const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type,
struct ndisc_options *ndopts);
/*
* IGMP
*/
int igmp6_init(void);
int igmp6_late_init(void);
void igmp6_cleanup(void);
void igmp6_late_cleanup(void);
int igmp6_event_query(struct sk_buff *skb);
int igmp6_event_report(struct sk_buff *skb);
#ifdef CONFIG_SYSCTL
int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);
int ndisc_ifinfo_sysctl_strategy(struct ctl_table *ctl,
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen);
#endif
void inet6_ifinfo_notify(int event, struct inet6_dev *idev);
#endif
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