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edurank.hust.college
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<!DOCTYPE html>
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<title>Patches contributed by Colorado School of Mines</title>
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<h1>Patches contributed by Colorado School of Mines</h1>
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<pre>commit c4062dfc425e94290ac427a98d6b4721dd2bc91f
Author: Erich E. Hoover &lt;ehoover@mines.edu&gt;
Date: Wed Feb 8 09:11:08 2012 +0000

ipv6: 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 &lt;ehoover@mines.edu&gt;
Signed-off-by: Eric Dumazet &lt;eric.dumazet@gmail.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;

diff --git a/include/linux/in6.h b/include/linux/in6.h
index 097a34b55560..5c83d9e3eb8f 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -271,6 +271,7 @@ struct in6_flowlabel_req {
#define IPV6_ORIGDSTADDR 74
#define IPV6_RECVORIGDSTADDR IPV6_ORIGDSTADDR
#define IPV6_TRANSPARENT 75
+#define IPV6_UNICAST_IF 76

/*
* Multicast Routing:
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 6318268dcaf5..743a16a41040 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -324,6 +324,7 @@ struct ipv6_pinfo {
__unused_2:6;
__s16 mcast_hops:9;
#endif
+ int ucast_oif;
int mcast_oif;

/* pktoption flags */
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 01d46bff63c3..af88934e4d79 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -468,6 +468,8 @@ void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)

if (!fl6.flowi6_oif &amp;&amp; ipv6_addr_is_multicast(&amp;fl6.daddr))
fl6.flowi6_oif = np-&gt;mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np-&gt;ucast_oif;

dst = icmpv6_route_lookup(net, skb, sk, &amp;fl6);
if (IS_ERR(dst))
@@ -553,6 +555,8 @@ static void icmpv6_echo_reply(struct sk_buff *skb)

if (!fl6.flowi6_oif &amp;&amp; ipv6_addr_is_multicast(&amp;fl6.daddr))
fl6.flowi6_oif = np-&gt;mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np-&gt;ucast_oif;

err = ip6_dst_lookup(sk, &amp;dst, &amp;fl6);
if (err)
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 18a2719003c3..6d6b65fdaa1a 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -516,6 +516,36 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
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-&gt;ucast_oif = 0;
+ retv = 0;
+ break;
+ }
+
+ dev = dev_get_by_index(net, ifindex);
+ retv = -EADDRNOTAVAIL;
+ if (!dev)
+ break;
+ dev_put(dev);
+
+ retv = -EINVAL;
+ if (sk-&gt;sk_bound_dev_if)
+ break;
+
+ np-&gt;ucast_oif = ifindex;
+ retv = 0;
+ break;
+ }
+
case IPV6_MULTICAST_IF:
if (sk-&gt;sk_type == SOCK_STREAM)
break;
@@ -1160,6 +1190,10 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = np-&gt;mcast_oif;
break;

+ case IPV6_UNICAST_IF:
+ val = (__force int)htonl((__u32) np-&gt;ucast_oif);
+ break;
+
case IPV6_MTU_DISCOVER:
val = np-&gt;pmtudisc;
break;
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index d02f7e4dd611..5bddea778840 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -856,6 +856,8 @@ static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk,

if (!fl6.flowi6_oif &amp;&amp; ipv6_addr_is_multicast(&amp;fl6.daddr))
fl6.flowi6_oif = np-&gt;mcast_oif;
+ else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np-&gt;ucast_oif;
security_sk_classify_flow(sk, flowi6_to_flowi(&amp;fl6));

dst = ip6_dst_lookup_flow(sk, &amp;fl6, final_p, true);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 4f96b5c63685..8aebf8f90436 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1130,7 +1130,8 @@ int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
if (!fl6.flowi6_oif &amp;&amp; ipv6_addr_is_multicast(&amp;fl6.daddr)) {
fl6.flowi6_oif = np-&gt;mcast_oif;
connected = 0;
- }
+ } else if (!fl6.flowi6_oif)
+ fl6.flowi6_oif = np-&gt;ucast_oif;

security_sk_classify_flow(sk, flowi6_to_flowi(&amp;fl6));
</pre><hr><pre>commit 76e21053b5bf33a07c76f99d27a74238310e3c71
Author: Erich E. Hoover &lt;ehoover@mines.edu&gt;
Date: Wed Feb 8 09:11:07 2012 +0000

ipv4: Implement IP_UNICAST_IF socket option.

The IP_UNICAST_IF feature is needed by the Wine project. This patch
implements the feature by setting the outgoing interface in a similar
fashion to that of IP_MULTICAST_IF. A separate option is needed to
handle this feature since the existing options do not provide all of
the characteristics required by IP_UNICAST_IF, a summary is provided
below.

SO_BINDTODEVICE:
* SO_BINDTODEVICE requires administrative privileges, IP_UNICAST_IF
does not. From reading some old mailing list articles my
understanding is that SO_BINDTODEVICE requires administrative
privileges because it can override the administrator's routing
settings.
* The SO_BINDTODEVICE option restricts both outbound and inbound
traffic, IP_UNICAST_IF only impacts outbound traffic.

IP_PKTINFO:
* Since IP_PKTINFO and IP_UNICAST_IF are independent options,
implementing IP_UNICAST_IF with IP_PKTINFO will likely break some
applications.
* Implementing IP_UNICAST_IF on top of IP_PKTINFO significantly
complicates the Wine codebase and reduces the socket performance
(doing this requires a lot of extra communication between the
"server" and "user" layers).

bind():
* bind() does not work on broadcast packets, IP_UNICAST_IF is
specifically intended to work with broadcast packets.
* Like SO_BINDTODEVICE, bind() restricts both outbound and inbound
traffic.

Signed-off-by: Erich E. Hoover &lt;ehoover@mines.edu&gt;
Signed-off-by: Eric Dumazet &lt;eric.dumazet@gmail.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;

diff --git a/include/linux/in.h b/include/linux/in.h
index 01129c0ea87c..e0337f11d92e 100644
--- a/include/linux/in.h
+++ b/include/linux/in.h
@@ -111,6 +111,7 @@ struct in_addr {
#define MCAST_LEAVE_SOURCE_GROUP 47
#define MCAST_MSFILTER 48
#define IP_MULTICAST_ALL 49
+#define IP_UNICAST_IF 50

#define MCAST_EXCLUDE 0
#define MCAST_INCLUDE 1
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h
index e3e405106afe..022f772c0ebe 100644
--- a/include/net/inet_sock.h
+++ b/include/net/inet_sock.h
@@ -132,6 +132,7 @@ struct rtable;
* @tos - TOS
* @mc_ttl - Multicasting TTL
* @is_icsk - is this an inet_connection_sock?
+ * @uc_index - Unicast outgoing device index
* @mc_index - Multicast device index
* @mc_list - Group array
* @cork - info to build ip hdr on each ip frag while socket is corked
@@ -167,6 +168,7 @@ struct inet_sock {
transparent:1,
mc_all:1,
nodefrag:1;
+ int uc_index;
int mc_index;
__be32 mc_addr;
struct ip_mc_socklist __rcu *mc_list;
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 8aa87c19fa00..9125529dab95 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -469,6 +469,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
(1&lt;&lt;IP_ROUTER_ALERT) | (1&lt;&lt;IP_FREEBIND) |
(1&lt;&lt;IP_PASSSEC) | (1&lt;&lt;IP_TRANSPARENT) |
(1&lt;&lt;IP_MINTTL) | (1&lt;&lt;IP_NODEFRAG))) ||
+ optname == IP_UNICAST_IF ||
optname == IP_MULTICAST_TTL ||
optname == IP_MULTICAST_ALL ||
optname == IP_MULTICAST_LOOP ||
@@ -628,6 +629,35 @@ static int do_ip_setsockopt(struct sock *sk, int level,
goto e_inval;
inet-&gt;mc_loop = !!val;
break;
+ case IP_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) {
+ inet-&gt;uc_index = 0;
+ err = 0;
+ break;
+ }
+
+ dev = dev_get_by_index(sock_net(sk), ifindex);
+ err = -EADDRNOTAVAIL;
+ if (!dev)
+ break;
+ dev_put(dev);
+
+ err = -EINVAL;
+ if (sk-&gt;sk_bound_dev_if)
+ break;
+
+ inet-&gt;uc_index = ifindex;
+ err = 0;
+ break;
+ }
case IP_MULTICAST_IF:
{
struct ip_mreqn mreq;
@@ -1178,6 +1208,9 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
case IP_MULTICAST_LOOP:
val = inet-&gt;mc_loop;
break;
+ case IP_UNICAST_IF:
+ val = (__force int)htonl((__u32) inet-&gt;uc_index);
+ break;
case IP_MULTICAST_IF:
{
struct in_addr addr;
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index aea5a199c37a..cfc82cf339f6 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -556,7 +556,8 @@ static int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
ipc.oif = inet-&gt;mc_index;
if (!saddr)
saddr = inet-&gt;mc_addr;
- }
+ } else if (!ipc.oif)
+ ipc.oif = inet-&gt;uc_index;

flowi4_init_output(&amp;fl4, ipc.oif, sk-&gt;sk_mark, tos,
RT_SCOPE_UNIVERSE, sk-&gt;sk_protocol,
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index 3ccda5ae8a27..ab466305b629 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -563,7 +563,8 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
ipc.oif = inet-&gt;mc_index;
if (!saddr)
saddr = inet-&gt;mc_addr;
- }
+ } else if (!ipc.oif)
+ ipc.oif = inet-&gt;uc_index;

flowi4_init_output(&amp;fl4, ipc.oif, sk-&gt;sk_mark, tos,
RT_SCOPE_UNIVERSE,
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 5d075b5f70fc..cd99f1a0f59f 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -917,7 +917,8 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
if (!saddr)
saddr = inet-&gt;mc_addr;
connected = 0;
- }
+ } else if (!ipc.oif)
+ ipc.oif = inet-&gt;uc_index;

if (connected)
rt = (struct rtable *)sk_dst_check(sk, 0);</pre>
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