/**
* Directly insert all skbs from @skb_list into @sk TCP write queue regardless
* write buffer size. This allows directly forward modified packets without
* copying. See do_tcp_sendpages() and tcp_sendmsg() in linux/net/ipv4/tcp.c.
*
* Can be called in softirq context as well as from kernel thread.
*
* TODO use MSG_MORE untill we reach end of message.
*/
int
ss_send(struct sock *sk, SsSkbList *skb_list, bool pass_skb)
{
int r = 0;
struct sk_buff *skb, *skb_copy;
SsWork sw = {
.sk = sk,
.action = SS_SEND,
};
BUG_ON(!sk);
BUG_ON(ss_skb_queue_empty(skb_list));
SS_DBG("%s: cpu=%d sk=%p (cpu=%d) state=%s\n", __func__,
smp_processor_id(), sk, sk->sk_incoming_cpu,
ss_statename[sk->sk_state]);
/*
* Remove the skbs from Tempesta lists if we won't use them,
* or copy them if they're going to be used by Tempesta during
* and after the transmission.
*/
if (pass_skb) {
sw.skb_list = *skb_list;
ss_skb_queue_head_init(skb_list);
} else {
ss_skb_queue_head_init(&sw.skb_list);
for (skb = ss_skb_peek(skb_list); skb; skb = ss_skb_next(skb)) {
/* tcp_transmit_skb() will clone the skb. */
skb_copy = pskb_copy_for_clone(skb, GFP_ATOMIC);
if (!skb_copy) {
SS_WARN("Unable to copy an egress SKB.\n");
r = -ENOMEM;
goto err;
}
ss_skb_queue_tail(&sw.skb_list, skb_copy);
}
}
/*
* Schedule the socket for TX softirq processing.
* Only part of @skb_list could be passed to send queue.
*/
if (ss_wq_push(&sw)) {
SS_WARN("Cannot schedule socket %p for transmission\n", sk);
r = -EBUSY;
goto err;
}
return 0;
err:
if (!pass_skb)
while ((skb = ss_skb_dequeue(&sw.skb_list)))
kfree_skb(skb);
return r;
}
TfwHttpMsg *
tfw_http_msg_alloc(int type)
{
TfwHttpMsg *hm = (type & Conn_Clnt)
? (TfwHttpMsg *)tfw_pool_new(TfwHttpReq, TFW_POOL_ZERO)
: (TfwHttpMsg *)tfw_pool_new(TfwHttpResp, TFW_POOL_ZERO);
if (!hm)
return NULL;
ss_skb_queue_head_init(&hm->msg.skb_list);
hm->h_tbl = (TfwHttpHdrTbl *)tfw_pool_alloc(hm->pool, TFW_HHTBL_SZ(1));
hm->h_tbl->size = __HHTBL_SZ(1);
hm->h_tbl->off = TFW_HTTP_HDR_RAW;
memset(hm->h_tbl->tbl, 0, __HHTBL_SZ(1) * sizeof(TfwHttpHdr));
INIT_LIST_HEAD(&hm->msg.msg_list);
return hm;
}
