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Diffstat (limited to 'net/ipv4/syncookies.c')
-rw-r--r--net/ipv4/syncookies.c39
1 files changed, 20 insertions, 19 deletions
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index e923d2f021aa..dd47e6da6fb3 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -190,6 +190,8 @@ static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
struct ip_options *opt)
{
+ struct inet_request_sock *ireq;
+ struct tcp_request_sock *treq;
struct tcp_sock *tp = tcp_sk(sk);
__u32 cookie = ntohl(skb->h.th->ack_seq) - 1;
struct sock *ret = sk;
@@ -209,19 +211,20 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
NET_INC_STATS_BH(LINUX_MIB_SYNCOOKIESRECV);
- req = tcp_openreq_alloc();
ret = NULL;
+ req = tcp_openreq_alloc(&or_ipv4); /* for safety */
if (!req)
goto out;
- req->rcv_isn = htonl(skb->h.th->seq) - 1;
- req->snt_isn = cookie;
+ ireq = inet_rsk(req);
+ treq = tcp_rsk(req);
+ treq->rcv_isn = htonl(skb->h.th->seq) - 1;
+ treq->snt_isn = cookie;
req->mss = mss;
- req->rmt_port = skb->h.th->source;
- req->af.v4_req.loc_addr = skb->nh.iph->daddr;
- req->af.v4_req.rmt_addr = skb->nh.iph->saddr;
- req->class = &or_ipv4; /* for savety */
- req->af.v4_req.opt = NULL;
+ ireq->rmt_port = skb->h.th->source;
+ ireq->loc_addr = skb->nh.iph->daddr;
+ ireq->rmt_addr = skb->nh.iph->saddr;
+ ireq->opt = NULL;
/* We throwed the options of the initial SYN away, so we hope
* the ACK carries the same options again (see RFC1122 4.2.3.8)
@@ -229,17 +232,15 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
if (opt && opt->optlen) {
int opt_size = sizeof(struct ip_options) + opt->optlen;
- req->af.v4_req.opt = kmalloc(opt_size, GFP_ATOMIC);
- if (req->af.v4_req.opt) {
- if (ip_options_echo(req->af.v4_req.opt, skb)) {
- kfree(req->af.v4_req.opt);
- req->af.v4_req.opt = NULL;
- }
+ ireq->opt = kmalloc(opt_size, GFP_ATOMIC);
+ if (ireq->opt != NULL && ip_options_echo(ireq->opt, skb)) {
+ kfree(ireq->opt);
+ ireq->opt = NULL;
}
}
- req->snd_wscale = req->rcv_wscale = req->tstamp_ok = 0;
- req->wscale_ok = req->sack_ok = 0;
+ ireq->snd_wscale = ireq->rcv_wscale = ireq->tstamp_ok = 0;
+ ireq->wscale_ok = ireq->sack_ok = 0;
req->expires = 0UL;
req->retrans = 0;
@@ -253,8 +254,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
struct flowi fl = { .nl_u = { .ip4_u =
{ .daddr = ((opt && opt->srr) ?
opt->faddr :
- req->af.v4_req.rmt_addr),
- .saddr = req->af.v4_req.loc_addr,
+ ireq->rmt_addr),
+ .saddr = ireq->loc_addr,
.tos = RT_CONN_FLAGS(sk) } },
.proto = IPPROTO_TCP,
.uli_u = { .ports =
@@ -272,7 +273,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
&req->rcv_wnd, &req->window_clamp,
0, &rcv_wscale);
/* BTW win scale with syncookies is 0 by definition */
- req->rcv_wscale = rcv_wscale;
+ ireq->rcv_wscale = rcv_wscale;
ret = get_cookie_sock(sk, skb, req, &rt->u.dst);
out: return ret;