| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1450784813-18304-13-git-send-email-huw@codeweavers.com>
Date: Tue, 22 Dec 2015 11:46:48 +0000
From: Huw Davies <huw@...eweavers.com>
To: netdev@...r.kernel.org, linux-security-module@...r.kernel.org,
selinux@...ho.nsa.gov
Cc: Paul Moore <pmoore@...hat.com>
Subject: [RFC PATCH 12/17] ipv6: Allow request socks to contain IPv6 options.
If set, these will that precedence over the parent's options during
both sending and child creation. If they're not set, the parent's
options (if any) will be used.
This is to allow the security_inet_conn_request() hook to modify the
IPv6 options in just the same way that it already may do for IPv4.
Signed-off-by: Huw Davies <huw@...eweavers.com>
---
include/net/inet_sock.h | 7 ++++++-
net/dccp/ipv6.c | 12 +++++++++---
net/ipv4/tcp_input.c | 3 +++
net/ipv6/tcp_ipv6.c | 12 +++++++++---
4 files changed, 27 insertions(+), 7 deletions(-)
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index 625bdf9..39bbe8d 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -96,7 +96,12 @@ struct inet_request_sock {
u32 ir_mark;
union {
struct ip_options_rcu *opt;
- struct sk_buff *pktopts;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct {
+ struct ipv6_txoptions *ipv6_opt;
+ struct sk_buff *pktopts;
+ };
+#endif
};
};
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 9c6d050..8bb1c3a 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -216,14 +216,17 @@ static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req
skb = dccp_make_response(sk, dst, req);
if (skb != NULL) {
struct dccp_hdr *dh = dccp_hdr(skb);
+ struct ipv6_txoptions *opt;
dh->dccph_checksum = dccp_v6_csum_finish(skb,
&ireq->ir_v6_loc_addr,
&ireq->ir_v6_rmt_addr);
fl6.daddr = ireq->ir_v6_rmt_addr;
rcu_read_lock();
- err = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt),
- np->tclass);
+ opt = ireq->ipv6_opt;
+ if (!opt)
+ opt = rcu_dereference(np->opt);
+ err = ip6_xmit(sk, skb, &fl6, opt, np->tclass);
rcu_read_unlock();
err = net_xmit_eval(err);
}
@@ -236,6 +239,7 @@ done:
static void dccp_v6_reqsk_destructor(struct request_sock *req)
{
dccp_feat_list_purge(&dccp_rsk(req)->dreq_featneg);
+ kfree(inet_rsk(req)->ipv6_opt);
kfree_skb(inet_rsk(req)->pktopts);
}
@@ -494,7 +498,9 @@ static struct sock *dccp_v6_request_recv_sock(const struct sock *sk,
* Yes, keeping reference count would be much more clever, but we make
* one more one thing there: reattach optmem to newsk.
*/
- opt = rcu_dereference(np->opt);
+ opt = ireq->ipv6_opt;
+ if (!opt)
+ opt = rcu_dereference(np->opt);
if (opt) {
opt = ipv6_dup_options(newsk, opt);
RCU_INIT_POINTER(newnp->opt, opt);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2d656ee..af91a95 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6094,6 +6094,9 @@ struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
kmemcheck_annotate_bitfield(ireq, flags);
ireq->opt = NULL;
+#if IS_ENABLED(CONFIG_IPV6)
+ ireq->pktopts = NULL;
+#endif
atomic64_set(&ireq->ir_cookie, 0);
ireq->ireq_state = TCP_NEW_SYN_RECV;
write_pnet(&ireq->ireq_net, sock_net(sk_listener));
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 6b8a8a9..a9041b2 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -443,6 +443,7 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
{
struct inet_request_sock *ireq = inet_rsk(req);
struct ipv6_pinfo *np = inet6_sk(sk);
+ struct ipv6_txoptions *opt;
struct flowi6 *fl6 = &fl->u.ip6;
struct sk_buff *skb;
int err = -ENOMEM;
@@ -462,8 +463,10 @@ static int tcp_v6_send_synack(const struct sock *sk, struct dst_entry *dst,
if (np->repflow && ireq->pktopts)
fl6->flowlabel = ip6_flowlabel(ipv6_hdr(ireq->pktopts));
- err = ip6_xmit(sk, skb, fl6, rcu_dereference(np->opt),
- np->tclass);
+ opt = ireq->ipv6_opt;
+ if (!opt)
+ opt = rcu_dereference(np->opt);
+ err = ip6_xmit(sk, skb, fl6, opt, np->tclass);
err = net_xmit_eval(err);
}
@@ -474,6 +477,7 @@ done:
static void tcp_v6_reqsk_destructor(struct request_sock *req)
{
+ kfree(inet_rsk(req)->ipv6_opt);
kfree_skb(inet_rsk(req)->pktopts);
}
@@ -1101,7 +1105,9 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
but we make one more one thing there: reattach optmem
to newsk.
*/
- opt = rcu_dereference(np->opt);
+ opt = ireq->ipv6_opt;
+ if (!opt)
+ opt = rcu_dereference(np->opt);
if (opt) {
opt = ipv6_dup_options(newsk, opt);
RCU_INIT_POINTER(newnp->opt, opt);
--
1.8.0
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists