diff options
Diffstat (limited to 'backport/compat/backport-4.7.c')
| -rw-r--r-- | backport/compat/backport-4.7.c | 184 |
1 files changed, 0 insertions, 184 deletions
diff --git a/backport/compat/backport-4.7.c b/backport/compat/backport-4.7.c deleted file mode 100644 index 372951b6..00000000 --- a/backport/compat/backport-4.7.c +++ /dev/null @@ -1,184 +0,0 @@ -/* - * Copyright(c) 2016 Hauke Mehrtens <hauke@hauke-m.de> - * - * Backport functionality introduced in Linux 4.7. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/export.h> -#include <linux/list.h> -#include <linux/rcupdate.h> -#include <linux/slab.h> -#include <linux/spinlock.h> -#include <linux/skbuff.h> -#include <net/netlink.h> - -/** - * __nla_reserve_64bit - reserve room for attribute on the skb and align it - * @skb: socket buffer to reserve room on - * @attrtype: attribute type - * @attrlen: length of attribute payload - * - * Adds a netlink attribute header to a socket buffer and reserves - * room for the payload but does not copy it. It also ensure that this - * attribute will be 64-bit aign. - * - * The caller is responsible to ensure that the skb provides enough - * tailroom for the attribute header and payload. - */ -struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype, - int attrlen, int padattr) -{ - if (nla_need_padding_for_64bit(skb)) - nla_align_64bit(skb, padattr); - - return __nla_reserve(skb, attrtype, attrlen); -} -EXPORT_SYMBOL_GPL(__nla_reserve_64bit); - -/** - * nla_reserve_64bit - reserve room for attribute on the skb and align it - * @skb: socket buffer to reserve room on - * @attrtype: attribute type - * @attrlen: length of attribute payload - * - * Adds a netlink attribute header to a socket buffer and reserves - * room for the payload but does not copy it. It also ensure that this - * attribute will be 64-bit aign. - * - * Returns NULL if the tailroom of the skb is insufficient to store - * the attribute header and payload. - */ -struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, int attrlen, - int padattr) -{ - size_t len; - - if (nla_need_padding_for_64bit(skb)) - len = nla_total_size_64bit(attrlen); - else - len = nla_total_size(attrlen); - if (unlikely(skb_tailroom(skb) < len)) - return NULL; - - return __nla_reserve_64bit(skb, attrtype, attrlen, padattr); -} -EXPORT_SYMBOL_GPL(nla_reserve_64bit); - -/** - * __nla_put_64bit - Add a netlink attribute to a socket buffer and align it - * @skb: socket buffer to add attribute to - * @attrtype: attribute type - * @attrlen: length of attribute payload - * @data: head of attribute payload - * - * The caller is responsible to ensure that the skb provides enough - * tailroom for the attribute header and payload. - */ -void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, - const void *data, int padattr) -{ - struct nlattr *nla; - - nla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr); - memcpy(nla_data(nla), data, attrlen); -} -EXPORT_SYMBOL_GPL(__nla_put_64bit); - -/** - * nla_put_64bit - Add a netlink attribute to a socket buffer and align it - * @skb: socket buffer to add attribute to - * @attrtype: attribute type - * @attrtype: attribute type - * @attrlen: length of attribute payload - * @data: head of attribute payload - * - * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store - * the attribute header and payload. - */ -int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen, - const void *data, int padattr) -{ - size_t len; - - if (nla_need_padding_for_64bit(skb)) - len = nla_total_size_64bit(attrlen); - else - len = nla_total_size(attrlen); - if (unlikely(skb_tailroom(skb) < len)) - return -EMSGSIZE; - - __nla_put_64bit(skb, attrtype, attrlen, data, padattr); - return 0; -} -EXPORT_SYMBOL_GPL(nla_put_64bit); - -/* - * Below 3.18 or if the kernel has devcoredump disabled, we copied the - * entire devcoredump, so no need to define these functions. - */ -#if LINUX_VERSION_IS_GEQ(3,18,0) && \ - !defined(CPTCFG_BPAUTO_BUILD_WANT_DEV_COREDUMP) -#include <linux/devcoredump.h> -#include <linux/scatterlist.h> - -static void devcd_free_sgtable(void *data) -{ - struct scatterlist *table = data; - int i; - struct page *page; - struct scatterlist *iter; - struct scatterlist *delete_iter; - - /* free pages */ - iter = table; - for_each_sg(table, iter, sg_nents(table), i) { - page = sg_page(iter); - if (page) - __free_page(page); - } - - /* then free all chained tables */ - iter = table; - delete_iter = table; /* always points on a head of a table */ - while (!sg_is_last(iter)) { - iter++; - if (sg_is_chain(iter)) { - iter = sg_chain_ptr(iter); - kfree(delete_iter); - delete_iter = iter; - } - } - - /* free the last table */ - kfree(delete_iter); -} - -static ssize_t devcd_read_from_sgtable(char *buffer, loff_t offset, - size_t buf_len, void *data, - size_t data_len) -{ - struct scatterlist *table = data; - - if (offset > data_len) - return -EINVAL; - - if (offset + buf_len > data_len) - buf_len = data_len - offset; - return sg_pcopy_to_buffer(table, sg_nents(table), buffer, buf_len, - offset); -} - -void dev_coredumpsg(struct device *dev, struct scatterlist *table, - size_t datalen, gfp_t gfp) -{ - dev_coredumpm(dev, THIS_MODULE, table, datalen, gfp, - /* cast away some const problems */ - (void *)devcd_read_from_sgtable, - (void *)devcd_free_sgtable); -} -EXPORT_SYMBOL_GPL(dev_coredumpsg); -#endif /* >= 3.18.0 */ |