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icmp6: support rfc 4884

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Extend the rfc 4884 read interface introduced for ipv4 in
commit eba75c587e ("icmp: support rfc 4884") to ipv6.

Add socket option SOL_IPV6/IPV6_RECVERR_RFC4884.

Changes v1->v2:
  - make ipv6_icmp_error_rfc4884 static (file scope)

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2020-07-24 09:03:10 -04:00 committed by David S. Miller
parent 178c49d9f9
commit 01370434df
6 changed files with 32 additions and 0 deletions
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1
include/linux/ipv6.h
View File

@ -283,6 +283,7 @@ struct ipv6_pinfo {
autoflowlabel:1,
autoflowlabel_set:1,
mc_all:1,
recverr_rfc4884:1,
rtalert_isolate:1;
__u8 min_hopcount;
__u8 tclass;

1
include/uapi/linux/icmpv6.h
View File

@ -68,6 +68,7 @@ struct icmp6hdr {
#define icmp6_mtu icmp6_dataun.un_data32[0]
#define icmp6_unused icmp6_dataun.un_data32[0]
#define icmp6_maxdelay icmp6_dataun.un_data16[0]
#define icmp6_datagram_len icmp6_dataun.un_data8[0]
#define icmp6_router icmp6_dataun.u_nd_advt.router
#define icmp6_solicited icmp6_dataun.u_nd_advt.solicited
#define icmp6_override icmp6_dataun.u_nd_advt.override

1
include/uapi/linux/in6.h
View File

@ -179,6 +179,7 @@ struct in6_flowlabel_req {
#define IPV6_LEAVE_ANYCAST 28
#define IPV6_MULTICAST_ALL 29
#define IPV6_ROUTER_ALERT_ISOLATE 30
#define IPV6_RECVERR_RFC4884 31
/* IPV6_MTU_DISCOVER values */
#define IPV6_PMTUDISC_DONT 0

1
net/ipv4/icmp.c
View File

@ -1173,6 +1173,7 @@ void ip_icmp_error_rfc4884(const struct sk_buff *skb,
if (!ip_icmp_error_rfc4884_validate(skb, off))
out->flags |= SO_EE_RFC4884_FLAG_INVALID;
}
EXPORT_SYMBOL_GPL(ip_icmp_error_rfc4884);
int icmp_err(struct sk_buff *skb, u32 info)
{

16
net/ipv6/datagram.c
View File

@ -19,6 +19,7 @@
#include <linux/route.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/icmp.h>
#include <net/ipv6.h>
#include <net/ndisc.h>
@ -284,6 +285,17 @@ int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr,
}
EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only);
static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb,
struct sock_ee_data_rfc4884 *out)
{
switch (icmp6_hdr(skb)->icmp6_type) {
case ICMPV6_TIME_EXCEED:
case ICMPV6_DEST_UNREACH:
ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr),
icmp6_hdr(skb)->icmp6_datagram_len * 8);
}
}
void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
__be16 port, u32 info, u8 *payload)
{
@ -313,6 +325,10 @@ void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
serr->port = port;
__skb_pull(skb, payload - skb->data);
if (inet6_sk(sk)->recverr_rfc4884)
ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884);
skb_reset_transport_header(skb);
if (sock_queue_err_skb(sk, skb))

12
net/ipv6/ipv6_sockglue.c
View File

@ -965,6 +965,14 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
np->rxopt.bits.recvfragsize = valbool;
retv = 0;
break;
case IPV6_RECVERR_RFC4884:
if (optlen < sizeof(int))
goto e_inval;
if (val < 0 || val > 1)
goto e_inval;
np->recverr_rfc4884 = valbool;
retv = 0;
break;
}
release_sock(sk);
@ -1439,6 +1447,10 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
val = np->rtalert_isolate;
break;
case IPV6_RECVERR_RFC4884:
val = np->recverr_rfc4884;
break;
default:
return -ENOPROTOOPT;
}