Find all udp sockets (struct sock *sk)
udp sockets:
Iterate from 0 to udp_table->mask and get udp_hslot from hash table:
for (i = 0; i < udp->table->mask; i++) {
struct udp_hslot *hslot = udp_table->hash[i];
...
}
For each hslot iterate over hslot->head null list to get sockets:
struct sock *sk;
sk_nulls_for_each(sk, node, &hslot->head) {
...
}
For each socket iterate over the socket buffers in
sk_receive_queue and sk_write_queue:
struct sock {
...
struct sk_buff_head sk_receive_queue;
...
struct sk_buff_head sk_write_queue;
...
};
struct sk_buff_head {
struct sk_buff *next;
struct sk_buff *prev;
};
For each struct sk_buff in the two lists clear the memory referenced
by skb->data / skb->data_len:
struct sk_buff {
...
unsigned int data_len;
...
unsigned char *data;
...
};
Signed-off-by: Aruna Balakrishnaiah <[email protected]>
---
eppic_scripts/udp_sk_buf.c | 79 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
create mode 100644 eppic_scripts/udp_sk_buf.c
diff --git a/eppic_scripts/udp_sk_buf.c b/eppic_scripts/udp_sk_buf.c
new file mode 100644
index 0000000..7e64300
--- /dev/null
+++ b/eppic_scripts/udp_sk_buf.c
@@ -0,0 +1,79 @@
+string
+udp_opt()
+{
+ return "l";
+}
+
+string
+udp_usage()
+{
+ return "\n";
+}
+
+static void
+udp_showusage()
+{
+ printf("usage : udp %s", udp_usage());
+}
+
+string
+udp_help()
+{
+ return "Help";
+}
+
+int
+udp()
+{
+ int i;
+ int size;
+ struct udp_table *table;
+ struct sock_common *off = 0;
+
+ table = &udp_table;
+
+ for (i = 0; i < table->mask; i++) {
+ struct hlist_nulls_node *pos;
+
+ pos = table->hash[i].head.first;
+
+ while (!((unsigned long)pos & 1)) {
+ struct sock *sk;
+ struct sk_buff *next;
+ struct sk_buff_head *head;
+ struct hlist_nulls_node *node;
+
+ sk = (struct sock *)((unsigned long)pos - ((unsigned
long)&(off->skc_dontcopy_begin)));
+
+ head = (struct sk_buff_head *)&(sk->sk_receive_queue);
+ next = (struct sk_buff *)sk->sk_receive_queue.next;
+
+ while (next != head)
+ {
+ struct sk_buff *buff = (struct sk_buff *)next;
+
+ memset((char *)buff->data, 'L', buff->data_len);
+ memset((char *)&(buff->data_len), 'L', 0x4);
+
+ next = buff->next;
+ }
+
+ head = (struct sk_buff_head *)&(sk->sk_write_queue);
+ next = (struct sk_buff *)sk->sk_write_queue.next;
+
+ while (next != head)
+ {
+ struct sk_buff *buff = (struct sk_buff *)next;
+
+ memset((char *)buff->data, 'L', buff->data_len);
+ memset((char *)&(buff->data_len), 'L', 0x4);
+
+ next = buff->next;
+ }
+
+ node = (struct hlist_nulls_node *)((unsigned long)sk +
(unsigned long)&(off->skc_dontcopy_begin));
+ pos = node->next;
+ }
+ }
+ return 1;
+}
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