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Message-Id: <20171017135806.4244-1-richard_c_haines@btinternet.com>
Date: Tue, 17 Oct 2017 14:58:06 +0100
From: Richard Haines <richard_c_haines@...nternet.com>
To: selinux@...ho.nsa.gov, netdev@...r.kernel.org,
linux-sctp@...r.kernel.org, linux-security-module@...r.kernel.org
Cc: paul@...l-moore.com, vyasevich@...il.com, nhorman@...driver.com,
sds@...ho.nsa.gov, eparis@...isplace.org,
marcelo.leitner@...il.com,
Richard Haines <richard_c_haines@...nternet.com>
Subject: [RFC PATCH 2/5] sctp: Add ip option support
Add ip option support to allow LSM security modules to utilise CIPSO/IPv4
and CALIPSO/IPv6 services.
Signed-off-by: Richard Haines <richard_c_haines@...nternet.com>
---
include/net/sctp/structs.h | 2 ++
net/sctp/chunk.c | 7 ++++---
net/sctp/ipv6.c | 37 ++++++++++++++++++++++++++++++-------
net/sctp/output.c | 3 ++-
net/sctp/protocol.c | 36 ++++++++++++++++++++++++++++++++++++
net/sctp/socket.c | 5 ++++-
6 files changed, 78 insertions(+), 12 deletions(-)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 5ab29af..7767577 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -461,6 +461,7 @@ struct sctp_af {
void (*ecn_capable)(struct sock *sk);
__u16 net_header_len;
int sockaddr_len;
+ int (*ip_options_len)(struct sock *sk);
sa_family_t sa_family;
struct list_head list;
};
@@ -485,6 +486,7 @@ struct sctp_pf {
int (*addr_to_user)(struct sctp_sock *sk, union sctp_addr *addr);
void (*to_sk_saddr)(union sctp_addr *, struct sock *sk);
void (*to_sk_daddr)(union sctp_addr *, struct sock *sk);
+ void (*copy_ip_options)(struct sock *sk, struct sock *newsk);
struct sctp_af *af;
};
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 1323d41..e49e240 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -153,7 +153,6 @@ static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chu
chunk->msg = msg;
}
-
/* A data chunk can have a maximum payload of (2^16 - 20). Break
* down any such message into smaller chunks. Opportunistically, fragment
* the chunks down to the current MTU constraints. We may get refragmented
@@ -190,7 +189,10 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
*/
max_data = asoc->pathmtu -
sctp_sk(asoc->base.sk)->pf->af->net_header_len -
- sizeof(struct sctphdr) - sizeof(struct sctp_data_chunk);
+ sizeof(struct sctphdr) - sizeof(struct sctp_data_chunk) -
+ sctp_sk(asoc->base.sk)->pf->af->
+ ip_options_len(asoc->base.sk);
+
max_data = SCTP_TRUNC4(max_data);
/* If the the peer requested that we authenticate DATA chunks
@@ -210,7 +212,6 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
/* Set first_len and then account for possible bundles on first frag */
first_len = max_data;
-
/* Check to see if we have a pending SACK and try to let it be bundled
* with this message. Do this if we don't have any data queued already.
* To check that, look at out_qlen and retransmit list.
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index a4b6ffb..49c9011 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -423,6 +423,33 @@ static void sctp_v6_copy_addrlist(struct list_head *addrlist,
rcu_read_unlock();
}
+/* Copy over any ip options */
+static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
+{
+ struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
+ struct ipv6_txoptions *opt;
+
+ newnp = inet6_sk(newsk);
+
+ rcu_read_lock();
+ opt = rcu_dereference(np->opt);
+ if (opt)
+ opt = ipv6_dup_options(newsk, opt);
+ RCU_INIT_POINTER(newnp->opt, opt);
+ rcu_read_unlock();
+}
+
+/* Account for the IP options */
+static int sctp_v6_ip_options_len(struct sock *sk)
+{
+ struct ipv6_pinfo *inet6 = inet6_sk(sk);
+
+ if (inet6->opt)
+ return inet6->opt->opt_flen + inet6->opt->opt_nflen;
+ else
+ return 0;
+}
+
/* Initialize a sockaddr_storage from in incoming skb. */
static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
int is_saddr)
@@ -662,7 +689,6 @@ static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
struct sock *newsk;
struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
struct sctp6_sock *newsctp6sk;
- struct ipv6_txoptions *opt;
newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
if (!newsk)
@@ -685,12 +711,7 @@ static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
newnp->ipv6_ac_list = NULL;
newnp->ipv6_fl_list = NULL;
- rcu_read_lock();
- opt = rcu_dereference(np->opt);
- if (opt)
- opt = ipv6_dup_options(newsk, opt);
- RCU_INIT_POINTER(newnp->opt, opt);
- rcu_read_unlock();
+ sctp_v6_copy_ip_options(sk, newsk);
/* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
* and getpeername().
@@ -1033,6 +1054,7 @@ static struct sctp_af sctp_af_inet6 = {
.ecn_capable = sctp_v6_ecn_capable,
.net_header_len = sizeof(struct ipv6hdr),
.sockaddr_len = sizeof(struct sockaddr_in6),
+ .ip_options_len = sctp_v6_ip_options_len,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_ipv6_setsockopt,
.compat_getsockopt = compat_ipv6_getsockopt,
@@ -1051,6 +1073,7 @@ static struct sctp_pf sctp_pf_inet6 = {
.addr_to_user = sctp_v6_addr_to_user,
.to_sk_saddr = sctp_v6_to_sk_saddr,
.to_sk_daddr = sctp_v6_to_sk_daddr,
+ .copy_ip_options = sctp_v6_copy_ip_options,
.af = &sctp_af_inet6,
};
diff --git a/net/sctp/output.c b/net/sctp/output.c
index 9d85049..85bcd5b 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -151,7 +151,8 @@ void sctp_packet_init(struct sctp_packet *packet,
INIT_LIST_HEAD(&packet->chunk_list);
if (asoc) {
struct sctp_sock *sp = sctp_sk(asoc->base.sk);
- overhead = sp->pf->af->net_header_len;
+ overhead = sp->pf->af->net_header_len +
+ sp->pf->af->ip_options_len(asoc->base.sk);
} else {
overhead = sizeof(struct ipv6hdr);
}
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 989a900..a9e54ac 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -237,6 +237,38 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
return error;
}
+/* Copy over any ip options */
+static void sctp_v4_copy_ip_options(struct sock *sk, struct sock *newsk)
+{
+ struct inet_sock *newinet, *inet = inet_sk(sk);
+ struct ip_options_rcu *inet_opt, *newopt = NULL;
+
+ newinet = inet_sk(newsk);
+
+ rcu_read_lock();
+ inet_opt = rcu_dereference(inet->inet_opt);
+ if (inet_opt) {
+ newopt = sock_kmalloc(newsk, sizeof(*inet_opt) +
+ inet_opt->opt.optlen, GFP_ATOMIC);
+ if (newopt)
+ memcpy(newopt, inet_opt, sizeof(*inet_opt) +
+ inet_opt->opt.optlen);
+ }
+ RCU_INIT_POINTER(newinet->inet_opt, newopt);
+ rcu_read_unlock();
+}
+
+/* Account for the IP options */
+static int sctp_v4_ip_options_len(struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (inet->inet_opt)
+ return inet->inet_opt->opt.optlen;
+ else
+ return 0;
+}
+
/* Initialize a sctp_addr from in incoming skb. */
static void sctp_v4_from_skb(union sctp_addr *addr, struct sk_buff *skb,
int is_saddr)
@@ -590,6 +622,8 @@ static struct sock *sctp_v4_create_accept_sk(struct sock *sk,
sctp_copy_sock(newsk, sk, asoc);
sock_reset_flag(newsk, SOCK_ZAPPED);
+ sctp_v4_copy_ip_options(sk, newsk);
+
newinet = inet_sk(newsk);
newinet->inet_daddr = asoc->peer.primary_addr.v4.sin_addr.s_addr;
@@ -1008,6 +1042,7 @@ static struct sctp_pf sctp_pf_inet = {
.addr_to_user = sctp_v4_addr_to_user,
.to_sk_saddr = sctp_v4_to_sk_saddr,
.to_sk_daddr = sctp_v4_to_sk_daddr,
+ .copy_ip_options = sctp_v4_copy_ip_options,
.af = &sctp_af_inet
};
@@ -1092,6 +1127,7 @@ static struct sctp_af sctp_af_inet = {
.ecn_capable = sctp_v4_ecn_capable,
.net_header_len = sizeof(struct iphdr),
.sockaddr_len = sizeof(struct sockaddr_in),
+ .ip_options_len = sctp_v4_ip_options_len,
#ifdef CONFIG_COMPAT
.compat_setsockopt = compat_ip_setsockopt,
.compat_getsockopt = compat_ip_getsockopt,
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 8d76086..70355a0 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -3124,6 +3124,7 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
if (asoc) {
if (val == 0) {
val = asoc->pathmtu;
+ val -= sp->pf->af->ip_options_len(asoc->base.sk);
val -= sp->pf->af->net_header_len;
val -= sizeof(struct sctphdr) +
sizeof(struct sctp_data_chunk);
@@ -4917,9 +4918,11 @@ int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp)
sctp_copy_sock(sock->sk, sk, asoc);
/* Make peeled-off sockets more like 1-1 accepted sockets.
- * Set the daddr and initialize id to something more random
+ * Set the daddr and initialize id to something more random and also
+ * copy over any ip options.
*/
sp->pf->to_sk_daddr(&asoc->peer.primary_addr, sk);
+ sp->pf->copy_ip_options(sk, sock->sk);
/* Populate the fields of the newsk from the oldsk and migrate the
* asoc to the newsk.
--
2.13.6
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