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Date: Fri, 23 Apr 2010 17:26:07 -0400
From: Brian Haley <brian.haley@...com>
To: davem@...emloft.net, yoshfuji@...ux-ipv6.org
Cc: netdev@...r.kernel.org
Subject: [PATCH 1/3] IPv6: data structure changes for new socket options
Add underlying data structure changes and basic setsockopt()
and getsockopt() support for IPV6_RECVPATHMTU, IPV6_PATHMTU,
and IPV6_DONTFRAG. IPV6_PATHMTU is actually fully functional
at this point.
Signed-off-by: Brian Haley <brian.haley@...com>
---
include/linux/in6.h | 2 +-
include/linux/ipv6.h | 13 ++++++++++---
net/ipv6/ipv6_sockglue.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 57 insertions(+), 4 deletions(-)
diff --git a/include/linux/in6.h b/include/linux/in6.h
index 9b90cb2..c4bf46f 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -221,10 +221,10 @@ struct in6_flowlabel_req {
#define IPV6_RTHDR 57
#define IPV6_RECVDSTOPTS 58
#define IPV6_DSTOPTS 59
-#if 0 /* not yet */
#define IPV6_RECVPATHMTU 60
#define IPV6_PATHMTU 61
#define IPV6_DONTFRAG 62
+#if 0 /* not yet */
#define IPV6_USE_MIN_MTU 63
#endif
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index 1bdbebf..1976942 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -21,6 +21,10 @@ struct in6_pktinfo {
int ipi6_ifindex;
};
+struct ip6_mtuinfo {
+ struct sockaddr_in6 ip6m_addr;
+ __u32 ip6m_mtu;
+};
struct in6_ifreq {
struct in6_addr ifr6_addr;
@@ -334,22 +338,25 @@ struct ipv6_pinfo {
dstopts:1,
odstopts:1,
rxflow:1,
- rxtclass:1;
+ rxtclass:1,
+ rxpmtu:1;
} bits;
__u16 all;
} rxopt;
/* sockopt flags */
- __u8 recverr:1,
+ __u16 recverr:1,
sndflow:1,
pmtudisc:2,
ipv6only:1,
- srcprefs:3; /* 001: prefer temporary address
+ srcprefs:3, /* 001: prefer temporary address
* 010: prefer public address
* 100: prefer care-of address
*/
+ dontfrag:1;
__u8 min_hopcount;
__u8 tclass;
+ __u8 padding;
__u32 dst_cookie;
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 92295ad..2bf9eda 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -337,6 +337,13 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
retv = 0;
break;
+ case IPV6_RECVPATHMTU:
+ if (optlen < sizeof(int))
+ goto e_inval;
+ np->rxopt.bits.rxpmtu = valbool;
+ retv = 0;
+ break;
+
case IPV6_HOPOPTS:
case IPV6_RTHDRDSTOPTS:
case IPV6_RTHDR:
@@ -773,6 +780,9 @@ pref_skip_coa:
if (val < 0 || val > 255)
goto e_inval;
np->min_hopcount = val;
+ break;
+ case IPV6_DONTFRAG:
+ np->dontfrag = valbool;
retv = 0;
break;
}
@@ -1063,6 +1073,38 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = np->rxopt.bits.rxflow;
break;
+ case IPV6_RECVPATHMTU:
+ val = np->rxopt.bits.rxpmtu;
+ break;
+
+ case IPV6_PATHMTU:
+ {
+ struct dst_entry *dst;
+ struct ip6_mtuinfo mtuinfo;
+
+ if (len < sizeof(mtuinfo))
+ return -EINVAL;
+
+ len = sizeof(mtuinfo);
+ memset(&mtuinfo, 0, sizeof(mtuinfo));
+
+ rcu_read_lock();
+ dst = __sk_dst_get(sk);
+ if (dst)
+ mtuinfo.ip6m_mtu = dst_mtu(dst);
+ rcu_read_unlock();
+ if (!mtuinfo.ip6m_mtu)
+ return -ENOTCONN;
+
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &mtuinfo, len))
+ return -EFAULT;
+
+ return 0;
+ break;
+ }
+
case IPV6_UNICAST_HOPS:
case IPV6_MULTICAST_HOPS:
{
@@ -1128,6 +1170,10 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = np->min_hopcount;
break;
+ case IPV6_DONTFRAG:
+ val = np->dontfrag;
+ break;
+
default:
return -ENOPROTOOPT;
}
--
1.5.4.3
--
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