From b24a2516d10751d7ed5afb58420df25370c9dffb Mon Sep 17 00:00:00 2001
From: Yang Hongyang <yanghy@cn.fujitsu.com>
Date: Tue, 16 Dec 2008 02:06:23 -0800
Subject: [PATCH] ipv6: Add IPV6_PKTINFO sticky option support to setsockopt()
There are three reasons for me to add this support:
1.When no interface is specified in an IPV6_PKTINFO ancillary data
item, the interface specified in an IPV6_PKTINFO sticky optionis
is used.
RFC3542:
6.7. Summary of Outgoing Interface Selection
This document and [RFC-3493] specify various methods that affect the
selection of the packet's outgoing interface. This subsection
summarizes the ordering among those in order to ensure deterministic
behavior.
For a given outgoing packet on a given socket, the outgoing interface
is determined in the following order:
1. if an interface is specified in an IPV6_PKTINFO ancillary data
item, the interface is used.
2. otherwise, if an interface is specified in an IPV6_PKTINFO sticky
option, the interface is used.
2.When no IPV6_PKTINFO ancillary data is received,getsockopt() should
return the sticky option value which set with setsockopt().
RFC 3542:
Issuing getsockopt() for the above options will return the sticky
option value i.e., the value set with setsockopt(). If no sticky
option value has been set getsockopt() will return the following
values:
3.Make the setsockopt implementation POSIX compliant.
Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/ipv6.h | 1 +
net/ipv6/ipv6_sockglue.c | 22 ++++++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 641e026eee8f..0b816cae533e 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -278,6 +278,7 @@ struct ipv6_pinfo {
struct in6_addr saddr;
struct in6_addr rcv_saddr;
struct in6_addr daddr;
+ struct in6_pktinfo sticky_pktinfo;
struct in6_addr *daddr_cache;
#ifdef CONFIG_IPV6_SUBTREES
struct in6_addr *saddr_cache;
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 2aa294be0c79..0feaee38bc37 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -395,6 +395,28 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
break;
}
+ case IPV6_PKTINFO:
+ {
+ struct in6_pktinfo pkt;
+
+ if (optlen == 0)
+ goto e_inval;
+ else if (optlen < sizeof(struct in6_pktinfo) || optval == NULL)
+ goto e_inval;
+
+ if (copy_from_user(&pkt, optval, optlen)) {
+ retv = -EFAULT;
+ break;
+ }
+ if (sk->sk_bound_dev_if && pkt.ipi6_ifindex != sk->sk_bound_dev_if)
+ goto e_inval;
+
+ np->sticky_pktinfo.ipi6_ifindex = pkt.ipi6_ifindex;
+ ipv6_addr_copy(&np->sticky_pktinfo.ipi6_addr, &pkt.ipi6_addr);
+ retv = 0;
+ break;
+ }
+
case IPV6_2292PKTOPTIONS:
{
struct ipv6_txoptions *opt = NULL;
--
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