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authorOctavian Purdila <octavian.purdila@intel.com>2014-06-25 17:10:02 +0300
committerDavid S. Miller <davem@davemloft.net>2014-06-27 15:53:37 -0700
commit1fb6f159fd21c640a28eb65fbd62ce8c9f6a777e (patch)
treeb7ba1708058d6c13ee686da1fce92a7d71b84c0f /net/ipv6
parent695da14eb0af21129187ed3810e329b21262e45f (diff)
tcp: add tcp_conn_request
Create tcp_conn_request and remove most of the code from tcp_v4_conn_request and tcp_v6_conn_request. Signed-off-by: Octavian Purdila <octavian.purdila@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/tcp_ipv6.c120
1 files changed, 2 insertions, 118 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 8232bc7423c6..bc24ee21339a 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1008,133 +1008,17 @@ static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb)
return sk;
}
-/* FIXME: this is substantially similar to the ipv4 code.
- * Can some kind of merge be done? -- erics
- */
static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
- struct tcp_options_received tmp_opt;
- struct request_sock *req;
- struct inet_request_sock *ireq;
- struct tcp_sock *tp = tcp_sk(sk);
- __u32 isn = TCP_SKB_CB(skb)->when;
- struct dst_entry *dst = NULL;
- struct tcp_fastopen_cookie foc = { .len = -1 };
- bool want_cookie = false, fastopen;
- struct flowi6 fl6;
- const struct tcp_request_sock_ops *af_ops;
- int err;
-
if (skb->protocol == htons(ETH_P_IP))
return tcp_v4_conn_request(sk, skb);
if (!ipv6_unicast_destination(skb))
goto drop;
- if ((sysctl_tcp_syncookies == 2 ||
- inet_csk_reqsk_queue_is_full(sk)) && !isn) {
- want_cookie = tcp_syn_flood_action(sk, skb, "TCPv6");
- if (!want_cookie)
- goto drop;
- }
+ return tcp_conn_request(&tcp6_request_sock_ops,
+ &tcp_request_sock_ipv6_ops, sk, skb);
- if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) {
- NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS);
- goto drop;
- }
-
- req = inet_reqsk_alloc(&tcp6_request_sock_ops);
- if (req == NULL)
- goto drop;
-
- af_ops = tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops;
-
- tcp_clear_options(&tmp_opt);
- tmp_opt.mss_clamp = af_ops->mss_clamp;
- tmp_opt.user_mss = tp->rx_opt.user_mss;
- tcp_parse_options(skb, &tmp_opt, 0, want_cookie ? NULL : &foc);
-
- if (want_cookie && !tmp_opt.saw_tstamp)
- tcp_clear_options(&tmp_opt);
-
- tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
- tcp_openreq_init(req, &tmp_opt, skb, sk);
-
- ireq = inet_rsk(req);
- af_ops->init_req(req, sk, skb);
-
- if (security_inet_conn_request(sk, skb, req))
- goto drop_and_release;
-
- if (!want_cookie || tmp_opt.tstamp_ok)
- TCP_ECN_create_request(req, skb, sock_net(sk));
-
- if (want_cookie) {
- isn = cookie_init_sequence(af_ops, sk, skb, &req->mss);
- req->cookie_ts = tmp_opt.tstamp_ok;
- } else if (!isn) {
- /* VJ's idea. We save last timestamp seen
- * from the destination in peer table, when entering
- * state TIME-WAIT, and check against it before
- * accepting new connection request.
- *
- * If "isn" is not zero, this request hit alive
- * timewait bucket, so that all the necessary checks
- * are made in the function processing timewait state.
- */
- if (tmp_opt.saw_tstamp && tcp_death_row.sysctl_tw_recycle) {
- dst = af_ops->route_req(sk, (struct flowi *)&fl6, req,
- NULL);
- if (dst && !tcp_peer_is_proven(req, dst, true)) {
- NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
- goto drop_and_release;
- }
- }
- /* Kill the following clause, if you dislike this way. */
- else if (!sysctl_tcp_syncookies &&
- (sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
- (sysctl_max_syn_backlog >> 2)) &&
- !tcp_peer_is_proven(req, dst, false)) {
- /* Without syncookies last quarter of
- * backlog is filled with destinations,
- * proven to be alive.
- * It means that we continue to communicate
- * to destinations, already remembered
- * to the moment of synflood.
- */
- LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open request from %pI6/%u\n",
- &ireq->ir_v6_rmt_addr, ntohs(tcp_hdr(skb)->source));
- goto drop_and_release;
- }
-
- isn = af_ops->init_seq(skb);
- }
-
- if (!dst) {
- dst = af_ops->route_req(sk, (struct flowi *)&fl6, req, NULL);
- if (!dst)
- goto drop_and_free;
- }
-
- tcp_rsk(req)->snt_isn = isn;
- tcp_openreq_init_rwin(req, sk, dst);
- fastopen = !want_cookie &&
- tcp_try_fastopen(sk, skb, req, &foc, dst);
- err = af_ops->send_synack(sk, dst, (struct flowi *)&fl6, req,
- skb_get_queue_mapping(skb), &foc);
- if (!fastopen) {
- if (err || want_cookie)
- goto drop_and_free;
-
- tcp_rsk(req)->listener = NULL;
- af_ops->queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
- }
- return 0;
-
-drop_and_release:
- dst_release(dst);
-drop_and_free:
- reqsk_free(req);
drop:
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
return 0; /* don't send reset */