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Date: Mon, 6 Feb 2012 10:57:44 -0700
From: "Erich E. Hoover" <ehoover@...es.edu>
To: Linux Netdev <netdev@...r.kernel.org>
Cc: "Erich E. Hoover" <ehoover@...es.edu>
Subject: [PATCH v3 2/2] Implement IPV6_UNICAST_IF socket option.
The IPV6_UNICAST_IF feature is the IPv6 compliment to IP_UNICAST_IF.
Signed-off-by: Erich E. Hoover <ehoover@...es.edu>
---
include/linux/in6.h | 1 +
include/linux/ipv6.h | 2 +
include/net/ipv6.h | 2 +
net/ipv6/af_inet6.c | 1 +
net/ipv6/icmp.c | 3 ++
net/ipv6/ipv6_sockglue.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++
net/ipv6/raw.c | 2 +-
net/ipv6/udp.c | 2 +-
8 files changed, 60 insertions(+), 2 deletions(-)
diff --git a/include/linux/in6.h b/include/linux/in6.h
index 097a34b..a67d76e 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -163,6 +163,7 @@ struct in6_flowlabel_req {
#define IPV6_NEXTHOP 9
#define IPV6_AUTHHDR 10 /* obsolete */
#define IPV6_FLOWINFO 11
+#define IPV6_UNICAST_IF 12
#define IPV6_UNICAST_HOPS 16
#define IPV6_MULTICAST_IF 17
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 6318268..1602fb0 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -299,6 +299,8 @@ struct ipv6_pinfo {
struct in6_addr *saddr_cache;
#endif
+ int outif_index;
+
__be32 flow_label;
__u32 frag_size;
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index e4170a2..252677c 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -254,6 +254,8 @@ static inline void fl6_sock_release(struct ip6_flowlabel *fl)
extern int ip6_ra_control(struct sock *sk, int sel);
+extern int ipv6_default_ifindex(const struct sock *sk);
+
extern int ipv6_parse_hopopts(struct sk_buff *skb);
extern struct ipv6_txoptions * ipv6_dup_options(struct sock *sk, struct ipv6_txoptions *opt);
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 13b84bc..d9ac287 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -199,6 +199,7 @@ lookup_protocol:
sk->sk_backlog_rcv = answer->prot->backlog_rcv;
inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
+ np->outif_index = 0;
np->hop_limit = -1;
np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
np->mc_loop = 1;
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 01d46bf..18f144e 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -551,6 +551,9 @@ static void icmpv6_echo_reply(struct sk_buff *skb)
return;
np = inet6_sk(sk);
+ if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = ipv6_default_ifindex(sk);
+
if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
fl6.flowi6_oif = np->mcast_oif;
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 18a2719..7248f5a 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -98,6 +98,21 @@ int ip6_ra_control(struct sock *sk, int sel)
return 0;
}
+int ipv6_default_ifindex(const struct sock *sk)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ int ifindex = sk->sk_bound_dev_if;
+
+ /*
+ * If not bound to a specific interface then set the outgoing interface
+ * to the value from the IPV6_UNICAST_IF socket option.
+ */
+ if (!ifindex)
+ ifindex = np->outif_index;
+
+ return ifindex;
+}
+
static
struct ipv6_txoptions *ipv6_update_options(struct sock *sk,
struct ipv6_txoptions *opt)
@@ -516,6 +531,36 @@ done:
retv = 0;
break;
+ case IPV6_UNICAST_IF:
+ {
+ struct net_device *dev = NULL;
+ int ifindex;
+
+ if (optlen != sizeof(int))
+ goto e_inval;
+
+ ifindex = (__force int)ntohl((__force __be32)val);
+ if (ifindex == 0) {
+ np->outif_index = 0;
+ retv = 0;
+ break;
+ }
+
+ dev = dev_get_by_index(net, ifindex);
+ retv = -EADDRNOTAVAIL;
+ if (!dev)
+ break;
+ dev_put(dev);
+
+ retv = -EINVAL;
+ if (sk->sk_bound_dev_if && ifindex != sk->sk_bound_dev_if)
+ break;
+
+ np->outif_index = ifindex;
+ retv = 0;
+ break;
+ }
+
case IPV6_MULTICAST_IF:
if (sk->sk_type == SOCK_STREAM)
break;
@@ -1160,6 +1205,10 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = np->mcast_oif;
break;
+ case IPV6_UNICAST_IF:
+ val = (__force int)htonl((__u32) np->outif_index);
+ break;
+
case IPV6_MTU_DISCOVER:
val = np->pmtudisc;
break;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index d02f7e4..25539a1 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -813,7 +813,7 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,
}
if (fl6.flowi6_oif == 0)
- fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.flowi6_oif = ipv6_default_ifindex(sk);
if (msg->msg_controllen) {
opt = &opt_space;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 4f96b5c..bb8db62 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1081,7 +1081,7 @@ do_udp_sendmsg:
}
if (!fl6.flowi6_oif)
- fl6.flowi6_oif = sk->sk_bound_dev_if;
+ fl6.flowi6_oif = ipv6_default_ifindex(sk);
if (!fl6.flowi6_oif)
fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
--
1.7.5.4
--
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