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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@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brian Haley 2010-04-23 11:26:07 +00:00 committed by David S. Miller
parent 3a73702863
commit 793b147316
3 changed files with 57 additions and 4 deletions
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2
include/linux/in6.h
View File

@ -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

13
include/linux/ipv6.h
View File

@ -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;

46
net/ipv6/ipv6_sockglue.c
View File

@ -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;
}