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@btinternet.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index e35d4f7..30a05a8 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -427,6 +427,41 @@ 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);
+ if (!opt)
+ pr_err("%s: Failed to copy ip options\n", __func__);
+ }
+ 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 *np = inet6_sk(sk);
+ struct ipv6_txoptions *opt;
+ int len = 0;
+
+ rcu_read_lock();
+ opt = rcu_dereference(np->opt);
+ if (opt)
+ len = opt->opt_flen + opt->opt_nflen;
+
+ rcu_read_unlock();
+ return len;
+}
+
/* 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)
@@ -666,7 +701,6 @@ 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)
@@ -689,12 +723,7 @@ 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().
@@ -1041,6 +1070,7 @@ 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,
@@ -1059,6 +1089,7 @@ 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,
};