From 8ac6c7a54ed1b98d142dce24b11c6de6a1e239a5 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 22 Oct 2024 10:36:11 +0000
Subject: [PATCH] 修改4g拨号为QMI,需要在系统里后台执行quectel-CM
---
kernel/net/ieee802154/6lowpan/reassembly.c | 201 ++++++++++++++-----------------------------------
1 files changed, 58 insertions(+), 143 deletions(-)
diff --git a/kernel/net/ieee802154/6lowpan/reassembly.c b/kernel/net/ieee802154/6lowpan/reassembly.c
index f307424..be6f06a 100644
--- a/kernel/net/ieee802154/6lowpan/reassembly.c
+++ b/kernel/net/ieee802154/6lowpan/reassembly.c
@@ -1,15 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/* 6LoWPAN fragment reassembly
- *
*
* Authors:
* Alexander Aring <aar@pengutronix.de>
*
* Based on: net/ipv6/reassembly.c
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) "6LoWPAN: " fmt
@@ -27,6 +22,7 @@
#include <net/6lowpan.h>
#include <net/ipv6_frag.h>
#include <net/inet_frag.h>
+#include <net/ip.h>
#include "6lowpan_i.h"
@@ -34,8 +30,8 @@
static struct inet_frags lowpan_frags;
-static int lowpan_frag_reasm(struct lowpan_frag_queue *fq,
- struct sk_buff *prev, struct net_device *ldev);
+static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb,
+ struct sk_buff *prev, struct net_device *ldev);
static void lowpan_frag_init(struct inet_frag_queue *q, const void *a)
{
@@ -78,7 +74,7 @@
key.src = *src;
key.dst = *dst;
- q = inet_frag_find(&ieee802154_lowpan->frags, &key);
+ q = inet_frag_find(ieee802154_lowpan->fqdir, &key);
if (!q)
return NULL;
@@ -88,9 +84,15 @@
static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
struct sk_buff *skb, u8 frag_type)
{
- struct sk_buff *prev, *next;
+ struct sk_buff *prev_tail;
struct net_device *ldev;
- int end, offset;
+ int end, offset, err;
+
+ /* inet_frag_queue_* functions use skb->cb; see struct ipfrag_skb_cb
+ * in inet_fragment.c
+ */
+ BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(struct inet_skb_parm));
+ BUILD_BUG_ON(sizeof(struct lowpan_802154_cb) > sizeof(struct inet6_skb_parm));
if (fq->q.flags & INET_FRAG_COMPLETE)
goto err;
@@ -117,45 +119,22 @@
}
}
- /* Find out which fragments are in front and at the back of us
- * in the chain of fragments so far. We must know where to put
- * this fragment, right?
- */
- prev = fq->q.fragments_tail;
- if (!prev ||
- lowpan_802154_cb(prev)->d_offset <
- lowpan_802154_cb(skb)->d_offset) {
- next = NULL;
- goto found;
- }
- prev = NULL;
- for (next = fq->q.fragments; next != NULL; next = next->next) {
- if (lowpan_802154_cb(next)->d_offset >=
- lowpan_802154_cb(skb)->d_offset)
- break; /* bingo! */
- prev = next;
- }
-
-found:
- /* Insert this fragment in the chain of fragments. */
- skb->next = next;
- if (!next)
- fq->q.fragments_tail = skb;
- if (prev)
- prev->next = skb;
- else
- fq->q.fragments = skb;
-
ldev = skb->dev;
if (ldev)
skb->dev = NULL;
+ barrier();
+
+ prev_tail = fq->q.fragments_tail;
+ err = inet_frag_queue_insert(&fq->q, skb, offset, end);
+ if (err)
+ goto err;
fq->q.stamp = skb->tstamp;
if (frag_type == LOWPAN_DISPATCH_FRAG1)
fq->q.flags |= INET_FRAG_FIRST_IN;
fq->q.meat += skb->len;
- add_frag_mem_limit(fq->q.net, skb->truesize);
+ add_frag_mem_limit(fq->q.fqdir, skb->truesize);
if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
fq->q.meat == fq->q.len) {
@@ -163,10 +142,11 @@
unsigned long orefdst = skb->_skb_refdst;
skb->_skb_refdst = 0UL;
- res = lowpan_frag_reasm(fq, prev, ldev);
+ res = lowpan_frag_reasm(fq, skb, prev_tail, ldev);
skb->_skb_refdst = orefdst;
return res;
}
+ skb_dst_drop(skb);
return -1;
err:
@@ -175,97 +155,28 @@
}
/* Check if this packet is complete.
- * Returns NULL on failure by any reason, and pointer
- * to current nexthdr field in reassembled frame.
*
* It is called with locked fq, and caller must check that
* queue is eligible for reassembly i.e. it is not COMPLETE,
* the last and the first frames arrived and all the bits are here.
*/
-static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev,
- struct net_device *ldev)
+static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *skb,
+ struct sk_buff *prev_tail, struct net_device *ldev)
{
- struct sk_buff *fp, *head = fq->q.fragments;
- int sum_truesize;
+ void *reasm_data;
inet_frag_kill(&fq->q);
- /* Make the one we just received the head. */
- if (prev) {
- head = prev->next;
- fp = skb_clone(head, GFP_ATOMIC);
-
- if (!fp)
- goto out_oom;
-
- fp->next = head->next;
- if (!fp->next)
- fq->q.fragments_tail = fp;
- prev->next = fp;
-
- skb_morph(head, fq->q.fragments);
- head->next = fq->q.fragments->next;
-
- consume_skb(fq->q.fragments);
- fq->q.fragments = head;
- }
-
- /* Head of list must not be cloned. */
- if (skb_unclone(head, GFP_ATOMIC))
+ reasm_data = inet_frag_reasm_prepare(&fq->q, skb, prev_tail);
+ if (!reasm_data)
goto out_oom;
+ inet_frag_reasm_finish(&fq->q, skb, reasm_data, false);
- /* If the first fragment is fragmented itself, we split
- * it to two chunks: the first with data and paged part
- * and the second, holding only fragments.
- */
- if (skb_has_frag_list(head)) {
- struct sk_buff *clone;
- int i, plen = 0;
-
- clone = alloc_skb(0, GFP_ATOMIC);
- if (!clone)
- goto out_oom;
- clone->next = head->next;
- head->next = clone;
- skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
- skb_frag_list_init(head);
- for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
- plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
- clone->len = head->data_len - plen;
- clone->data_len = clone->len;
- head->data_len -= clone->len;
- head->len -= clone->len;
- add_frag_mem_limit(fq->q.net, clone->truesize);
- }
-
- WARN_ON(head == NULL);
-
- sum_truesize = head->truesize;
- for (fp = head->next; fp;) {
- bool headstolen;
- int delta;
- struct sk_buff *next = fp->next;
-
- sum_truesize += fp->truesize;
- if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
- kfree_skb_partial(fp, headstolen);
- } else {
- if (!skb_shinfo(head)->frag_list)
- skb_shinfo(head)->frag_list = fp;
- head->data_len += fp->len;
- head->len += fp->len;
- head->truesize += fp->truesize;
- }
- fp = next;
- }
- sub_frag_mem_limit(fq->q.net, sum_truesize);
-
- head->next = NULL;
- head->dev = ldev;
- head->tstamp = fq->q.stamp;
-
- fq->q.fragments = NULL;
+ skb->dev = ldev;
+ skb->tstamp = fq->q.stamp;
+ fq->q.rb_fragments = RB_ROOT;
fq->q.fragments_tail = NULL;
+ fq->q.last_run_head = NULL;
return 1;
out_oom:
@@ -284,7 +195,7 @@
net_warn_ratelimited("%s: received unknown dispatch\n",
__func__);
- /* fall-through */
+ fallthrough;
default:
/* all others failure */
return NET_RX_DROP;
@@ -410,23 +321,18 @@
static struct ctl_table lowpan_frags_ns_ctl_table[] = {
{
.procname = "6lowpanfrag_high_thresh",
- .data = &init_net.ieee802154_lowpan.frags.high_thresh,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
- .extra1 = &init_net.ieee802154_lowpan.frags.low_thresh
},
{
.procname = "6lowpanfrag_low_thresh",
- .data = &init_net.ieee802154_lowpan.frags.low_thresh,
.maxlen = sizeof(unsigned long),
.mode = 0644,
.proc_handler = proc_doulongvec_minmax,
- .extra2 = &init_net.ieee802154_lowpan.frags.high_thresh
},
{
.procname = "6lowpanfrag_time",
- .data = &init_net.ieee802154_lowpan.frags.timeout,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_jiffies,
@@ -461,17 +367,16 @@
if (table == NULL)
goto err_alloc;
- table[0].data = &ieee802154_lowpan->frags.high_thresh;
- table[0].extra1 = &ieee802154_lowpan->frags.low_thresh;
- table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh;
- table[1].data = &ieee802154_lowpan->frags.low_thresh;
- table[1].extra2 = &ieee802154_lowpan->frags.high_thresh;
- table[2].data = &ieee802154_lowpan->frags.timeout;
-
/* Don't export sysctls to unprivileged users */
if (net->user_ns != &init_user_ns)
table[0].procname = NULL;
}
+
+ table[0].data = &ieee802154_lowpan->fqdir->high_thresh;
+ table[0].extra1 = &ieee802154_lowpan->fqdir->low_thresh;
+ table[1].data = &ieee802154_lowpan->fqdir->low_thresh;
+ table[1].extra2 = &ieee802154_lowpan->fqdir->high_thresh;
+ table[2].data = &ieee802154_lowpan->fqdir->timeout;
hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table);
if (hdr == NULL)
@@ -539,18 +444,27 @@
net_ieee802154_lowpan(net);
int res;
- ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
- ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH;
- ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT;
- ieee802154_lowpan->frags.f = &lowpan_frags;
- res = inet_frags_init_net(&ieee802154_lowpan->frags);
+ res = fqdir_init(&ieee802154_lowpan->fqdir, &lowpan_frags, net);
if (res < 0)
return res;
+
+ ieee802154_lowpan->fqdir->high_thresh = IPV6_FRAG_HIGH_THRESH;
+ ieee802154_lowpan->fqdir->low_thresh = IPV6_FRAG_LOW_THRESH;
+ ieee802154_lowpan->fqdir->timeout = IPV6_FRAG_TIMEOUT;
+
res = lowpan_frags_ns_sysctl_register(net);
if (res < 0)
- inet_frags_exit_net(&ieee802154_lowpan->frags);
+ fqdir_exit(ieee802154_lowpan->fqdir);
return res;
+}
+
+static void __net_exit lowpan_frags_pre_exit_net(struct net *net)
+{
+ struct netns_ieee802154_lowpan *ieee802154_lowpan =
+ net_ieee802154_lowpan(net);
+
+ fqdir_pre_exit(ieee802154_lowpan->fqdir);
}
static void __net_exit lowpan_frags_exit_net(struct net *net)
@@ -559,12 +473,13 @@
net_ieee802154_lowpan(net);
lowpan_frags_ns_sysctl_unregister(net);
- inet_frags_exit_net(&ieee802154_lowpan->frags);
+ fqdir_exit(ieee802154_lowpan->fqdir);
}
static struct pernet_operations lowpan_frags_ops = {
- .init = lowpan_frags_init_net,
- .exit = lowpan_frags_exit_net,
+ .init = lowpan_frags_init_net,
+ .pre_exit = lowpan_frags_pre_exit_net,
+ .exit = lowpan_frags_exit_net,
};
static u32 lowpan_key_hashfn(const void *data, u32 len, u32 seed)
--
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