diff options
author | Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com> | 2014-02-27 15:32:17 +0900 |
---|---|---|
committer | Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp> | 2014-03-10 13:10:18 +0900 |
commit | d3ad960d2becd0c6a8414a06f3f1dd91d6a77c5a (patch) | |
tree | c8cb8f5cfda2108dde109414dacec5ea09b289aa /eppic_scripts | |
parent | 38be4d8989841e86c5b56c9bd324201a19d10821 (diff) |
[PATCH 06/11] eppic: Scrub data of udp socket buffers.
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 <aruna@linux.vnet.ibm.com>
Diffstat (limited to 'eppic_scripts')
-rw-r--r-- | eppic_scripts/udp_sk_buf.c | 79 |
1 files changed, 79 insertions, 0 deletions
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; +} |