C++ (Cpp) tcp_make_synack Examples

Example #1

File: tcp_ipv6.c Project: Leoyzen/Charm-Eye

static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
			      struct request_values *rvp)
{
	struct inet6_request_sock *treq = inet6_rsk(req);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff * skb;
	struct ipv6_txoptions *opt = NULL;
	struct in6_addr * final_p, final;
	struct flowi6 fl6;
	struct dst_entry *dst;
	int err;

	memset(&fl6, 0, sizeof(fl6));
	fl6.flowi6_proto = IPPROTO_TCP;
	fl6.daddr = treq->rmt_addr;
	fl6.saddr = treq->loc_addr;
	fl6.flowlabel = 0;
	fl6.flowi6_oif = treq->iif;
	fl6.flowi6_mark = inet_rsk(req)->ir_mark;
	fl6.fl6_dport = inet_rsk(req)->rmt_port;
	fl6.fl6_sport = inet_rsk(req)->loc_port;
	fl6.flowi6_uid = sock_i_uid(sk);
	security_req_classify_flow(req, flowi6_to_flowi(&fl6));

	opt = np->opt;
	final_p = fl6_update_dst(&fl6, opt, &final);

	dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
	if (IS_ERR(dst)) {
		err = PTR_ERR(dst);
		dst = NULL;
		goto done;
	}
	skb = tcp_make_synack(sk, dst, req, rvp);
	err = -ENOMEM;
	if (skb) {
		__tcp_v6_send_check(skb, &treq->loc_addr, &treq->rmt_addr);

		fl6.daddr = treq->rmt_addr;
		err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
		err = net_xmit_eval(err);
	}

done:
	if (opt && opt != np->opt)
		sock_kfree_s(sk, opt, opt->tot_len);
	dst_release(dst);
	return err;
}

Example #2

File: tcp_ipv6.c Project: mrtos/Logitech-Revue

			ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
			final_p = &final;
		}

		err = ip6_dst_lookup(sk, &dst, &fl);
		if (err)
			goto done;
		if (final_p) {
			ipv6_addr_copy(&fl.fl6_dst, final_p);
			fl.flags |= FLOWI_FLAG_NOTROUTE;
		}
		if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0)
			goto done;
	}

	skb = tcp_make_synack(sk, dst, req);
	if (skb) {
		struct tcphdr *th = skb->h.th;

		th->check = tcp_v6_check(th, skb->len,
					 &treq->loc_addr, &treq->rmt_addr,
					 csum_partial((char *)th, skb->len, skb->csum));

		ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
		err = ip6_xmit(sk, skb, &fl, opt, 0);
		if (err == NET_XMIT_CN)
			err = 0;
	}

done:
        if (opt && opt != np->opt)