diff options
Diffstat (limited to 'net/tipc/msg.c')
| -rw-r--r-- | net/tipc/msg.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/net/tipc/msg.c b/net/tipc/msg.c index 697223a21240..b6eb90cd3ef7 100644 --- a/net/tipc/msg.c +++ b/net/tipc/msg.c @@ -327,6 +327,40 @@ bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu) } /** + * tipc_msg_extract(): extract bundled inner packet from buffer + * @skb: linear outer buffer, to be extracted from. + * @iskb: extracted inner buffer, to be returned + * @pos: position of msg to be extracted. Returns with pointer of next msg + * Consumes outer buffer when last packet extracted + * Returns true when when there is an extracted buffer, otherwise false + */ +bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos) +{ + struct tipc_msg *msg = buf_msg(skb); + int imsz; + struct tipc_msg *imsg = (struct tipc_msg *)(msg_data(msg) + *pos); + + /* Is there space left for shortest possible message? */ + if (*pos > (msg_data_sz(msg) - SHORT_H_SIZE)) + goto none; + imsz = msg_size(imsg); + + /* Is there space left for current message ? */ + if ((*pos + imsz) > msg_data_sz(msg)) + goto none; + *iskb = tipc_buf_acquire(imsz); + if (!*iskb) + goto none; + skb_copy_to_linear_data(*iskb, imsg, imsz); + *pos += align(imsz); + return true; +none: + kfree_skb(skb); + *iskb = NULL; + return false; +} + +/** * tipc_msg_make_bundle(): Create bundle buf and append message to its tail * @list: the buffer chain * @skb: buffer to be appended and replaced |