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/*
* Copyright 2012 Luis R. Rodriguez <mcgrof@frijolero.org>
*
* 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.
*
* Backport functionality introduced in Linux 3.3.
*/
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include <net/dst.h>
#include <net/xfrm.h>
static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
{
new->tstamp = old->tstamp;
new->dev = old->dev;
new->transport_header = old->transport_header;
new->network_header = old->network_header;
new->mac_header = old->mac_header;
skb_dst_copy(new, old);
new->rxhash = old->rxhash;
#if LINUX_VERSION_IS_GEQ(3,1,0)
new->ooo_okay = old->ooo_okay;
#endif
#if LINUX_VERSION_IS_GEQ(3,2,0)
new->l4_rxhash = old->l4_rxhash;
#endif
#ifdef CONFIG_XFRM
new->sp = secpath_get(old->sp);
#endif
memcpy(new->cb, old->cb, sizeof(old->cb));
new->csum = old->csum;
new->local_df = old->local_df;
new->pkt_type = old->pkt_type;
new->ip_summed = old->ip_summed;
skb_copy_queue_mapping(new, old);
new->priority = old->priority;
#if IS_ENABLED(CONFIG_IP_VS)
new->ipvs_property = old->ipvs_property;
#endif
new->protocol = old->protocol;
new->mark = old->mark;
new->skb_iif = old->skb_iif;
__nf_copy(new, old);
#if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE)
new->nf_trace = old->nf_trace;
#endif
#ifdef CONFIG_NET_SCHED
new->tc_index = old->tc_index;
#ifdef CONFIG_NET_CLS_ACT
new->tc_verd = old->tc_verd;
#endif
#endif
new->vlan_tci = old->vlan_tci;
skb_copy_secmark(new, old);
}
static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
{
#ifndef NET_SKBUFF_DATA_USES_OFFSET
/*
* Shift between the two data areas in bytes
*/
unsigned long offset = new->data - old->data;
#endif
__copy_skb_header(new, old);
#ifndef NET_SKBUFF_DATA_USES_OFFSET
/* {transport,network,mac}_header are relative to skb->head */
new->transport_header += offset;
new->network_header += offset;
if (skb_mac_header_was_set(new))
new->mac_header += offset;
#endif
skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
skb_shinfo(new)->gso_type = skb_shinfo(old)->gso_type;
}
static void skb_clone_fraglist(struct sk_buff *skb)
{
struct sk_buff *list;
skb_walk_frags(skb, list)
skb_get(list);
}
/**
* __pskb_copy - create copy of an sk_buff with private head.
* @skb: buffer to copy
* @headroom: headroom of new skb
* @gfp_mask: allocation priority
*
* Make a copy of both an &sk_buff and part of its data, located
* in header. Fragmented data remain shared. This is used when
* the caller wishes to modify only header of &sk_buff and needs
* private copy of the header to alter. Returns %NULL on failure
* or the pointer to the buffer on success.
* The returned buffer has a reference count of 1.
*/
struct sk_buff *__pskb_copy(struct sk_buff *skb, int headroom, gfp_t gfp_mask)
{
unsigned int size = skb_headlen(skb) + headroom;
struct sk_buff *n = alloc_skb(size, gfp_mask);
if (!n)
goto out;
/* Set the data pointer */
skb_reserve(n, headroom);
/* Set the tail pointer and length */
skb_put(n, skb_headlen(skb));
/* Copy the bytes */
skb_copy_from_linear_data(skb, n->data, n->len);
n->truesize += skb->data_len;
n->data_len = skb->data_len;
n->len = skb->len;
if (skb_shinfo(skb)->nr_frags) {
int i;
/*
* SKBTX_DEV_ZEROCOPY was added on 3.1 as well but requires ubuf
* stuff added to the skb which we do not have
*/
#if 0
if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
if (skb_copy_ubufs(skb, gfp_mask)) {
kfree_skb(n);
n = NULL;
goto out;
}
}
#endif
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
skb_shinfo(n)->frags[i] = skb_shinfo(skb)->frags[i];
#if LINUX_VERSION_IS_GEQ(3,2,0)
skb_frag_ref(skb, i);
#else
get_page(skb_shinfo(skb)->frags[i].page);
#endif
}
skb_shinfo(n)->nr_frags = i;
}
if (skb_has_frag_list(skb)) {
skb_shinfo(n)->frag_list = skb_shinfo(skb)->frag_list;
skb_clone_fraglist(n);
}
copy_skb_header(n, skb);
out:
return n;
}
EXPORT_SYMBOL_GPL(__pskb_copy);
static DEFINE_SPINLOCK(wq_name_lock);
static LIST_HEAD(wq_name_list);
struct wq_name {
struct list_head list;
struct workqueue_struct *wq;
char name[24];
};
struct workqueue_struct *
backport_alloc_workqueue(const char *fmt, unsigned int flags,
int max_active, struct lock_class_key *key,
const char *lock_name, ...)
{
struct workqueue_struct *wq;
struct wq_name *n = kzalloc(sizeof(*n), GFP_KERNEL);
va_list args;
if (!n)
return NULL;
va_start(args, lock_name);
vsnprintf(n->name, sizeof(n->name), fmt, args);
va_end(args);
wq = __alloc_workqueue_key(n->name, flags, max_active, key, lock_name);
if (!wq) {
kfree(n);
return NULL;
}
n->wq = wq;
spin_lock(&wq_name_lock);
list_add(&n->list, &wq_name_list);
spin_unlock(&wq_name_lock);
return wq;
}
EXPORT_SYMBOL_GPL(backport_alloc_workqueue);
void backport_destroy_workqueue(struct workqueue_struct *wq)
{
struct wq_name *n, *tmp;
/* call original */
#undef destroy_workqueue
destroy_workqueue(wq);
spin_lock(&wq_name_lock);
list_for_each_entry_safe(n, tmp, &wq_name_list, list) {
if (n->wq == wq) {
list_del(&n->list);
kfree(n);
break;
}
}
spin_unlock(&wq_name_lock);
}
EXPORT_SYMBOL_GPL(backport_destroy_workqueue);
void genl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
struct nlmsghdr *nlh, gfp_t flags)
{
struct sock *sk = net->genl_sock;
int report = 0;
if (nlh)
report = nlmsg_report(nlh);
nlmsg_notify(sk, skb, pid, group, report, flags);
}
EXPORT_SYMBOL_GPL(genl_notify);
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