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Date: Thu, 9 Oct 2008 12:35:36 +0300
From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To: David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org,
"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Subject: [PATCH 3/4] tcpv6: convert opt[] -> topt in tcp_v6_send_reset
after this I get:
$ diff-funcs tcp_v6_send_reset tcp_ipv6.c tcp_ipv6.c tcp_v6_send_ack
--- tcp_ipv6.c:tcp_v6_send_reset()
+++ tcp_ipv6.c:tcp_v6_send_ack()
@@ -1,4 +1,5 @@
-static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
+static void tcp_v6_send_ack(struct sk_buff *skb, u32 seq, u32 ack, u32 win,
u32 ts,
+ struct tcp_md5sig_key *key)
{
struct tcphdr *th = tcp_hdr(skb), *t1;
struct sk_buff *buff;
@@ -7,31 +8,14 @@
struct sock *ctl_sk = net->ipv6.tcp_sk;
unsigned int tot_len = sizeof(struct tcphdr);
__be32 *topt;
-#ifdef CONFIG_TCP_MD5SIG
- struct tcp_md5sig_key *key;
-#endif
-
- if (th->rst)
- return;
-
- if (!ipv6_unicast_destination(skb))
- return;
+ if (ts)
+ tot_len += TCPOLEN_TSTAMP_ALIGNED;
#ifdef CONFIG_TCP_MD5SIG
- if (sk)
- key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr);
- else
- key = NULL;
-
if (key)
tot_len += TCPOLEN_MD5SIG_ALIGNED;
#endif
- /*
- * We need to grab some memory, and put together an RST,
- * and then put it into the queue to be sent.
- */
-
buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len,
GFP_ATOMIC);
if (buff == NULL)
@@ -46,18 +30,20 @@
t1->dest = th->source;
t1->source = th->dest;
t1->doff = tot_len / 4;
- t1->rst = 1;
-
- if(th->ack) {
- t1->seq = th->ack_seq;
- } else {
- t1->ack = 1;
- t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin
- + skb->len - (th->doff<<2));
- }
+ t1->seq = htonl(seq);
+ t1->ack_seq = htonl(ack);
+ t1->ack = 1;
+ t1->window = htons(win);
topt = (__be32 *)(t1 + 1);
+ if (ts) {
+ *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+ (TCPOPT_TIMESTAMP << 8) |
TCPOLEN_TIMESTAMP);
+ *topt++ = htonl(tcp_time_stamp);
+ *topt++ = htonl(ts);
+ }
+
#ifdef CONFIG_TCP_MD5SIG
if (key) {
*topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
@@ -84,15 +70,10 @@
fl.fl_ip_sport = t1->source;
security_skb_classify_flow(skb, &fl);
- /* Pass a socket to ip6_dst_lookup either it is for RST
- * Underlying function will use this to retrieve the network
- * namespace
- */
if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
TCP_INC_STATS_BH(net, TCP_MIB_OUTSEGS);
- TCP_INC_STATS_BH(net, TCP_MIB_OUTRSTS);
return;
}
}
...which starts to be trivial to combine.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
---
net/ipv6/tcp_ipv6.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 3f268a3..082724b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -949,6 +949,7 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
struct net *net = dev_net(skb->dst->dev);
struct sock *ctl_sk = net->ipv6.tcp_sk;
unsigned int tot_len = sizeof(struct tcphdr);
+ __be32 *topt;
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *key;
#endif
@@ -998,14 +999,13 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
+ skb->len - (th->doff<<2));
}
+ topt = (__be32 *)(t1 + 1);
+
#ifdef CONFIG_TCP_MD5SIG
if (key) {
- __be32 *opt = (__be32*)(t1 + 1);
- opt[0] = htonl((TCPOPT_NOP << 24) |
- (TCPOPT_NOP << 16) |
- (TCPOPT_MD5SIG << 8) |
- TCPOLEN_MD5SIG);
- tcp_v6_md5_hash_hdr((__u8 *)&opt[1], key,
+ *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+ (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG);
+ tcp_v6_md5_hash_hdr((__u8 *)topt, key,
&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr, t1);
}
--
1.5.2.2
--
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