20e1954fe2
When receiving an ICMPv4 message containing extensions as
defined in RFC 4884, and translating it to ICMPv6 at SIT
or GRE tunnel, we need some extra manipulation in order
to properly forward the extensions.
This patch only takes care of Time Exceeded messages as they
are the ones that typically carry information from various
routers in a fabric during a traceroute session.
It also avoids complex skb logic if the data_len is not
a multiple of 8.
RFC states :
The "original datagram" field MUST contain at least 128 octets.
If the original datagram did not contain 128 octets, the
"original datagram" field MUST be zero padded to 128 octets.
In practice routers use 128 bytes of original datagram, not more.
Initial translation was added in commit ca15a078bd
("sit: generate icmpv6 error when receiving icmpv4 error")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Oussama Ghorbel <ghorbel@pivasoftware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
#ifndef _LINUX_ICMPV6_H
|
|
#define _LINUX_ICMPV6_H
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <uapi/linux/icmpv6.h>
|
|
|
|
static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
|
|
{
|
|
return (struct icmp6hdr *)skb_transport_header(skb);
|
|
}
|
|
|
|
#include <linux/netdevice.h>
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
extern void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info);
|
|
|
|
typedef void ip6_icmp_send_t(struct sk_buff *skb, u8 type, u8 code, __u32 info,
|
|
const struct in6_addr *force_saddr);
|
|
extern int inet6_register_icmp_sender(ip6_icmp_send_t *fn);
|
|
extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);
|
|
int ip6_err_gen_icmpv6_unreach(struct sk_buff *skb, int nhs, int type,
|
|
unsigned int data_len);
|
|
|
|
#else
|
|
|
|
static inline void icmpv6_send(struct sk_buff *skb,
|
|
u8 type, u8 code, __u32 info)
|
|
{
|
|
|
|
}
|
|
#endif
|
|
|
|
extern int icmpv6_init(void);
|
|
extern int icmpv6_err_convert(u8 type, u8 code,
|
|
int *err);
|
|
extern void icmpv6_cleanup(void);
|
|
extern void icmpv6_param_prob(struct sk_buff *skb,
|
|
u8 code, int pos);
|
|
|
|
struct flowi6;
|
|
struct in6_addr;
|
|
extern void icmpv6_flow_init(struct sock *sk,
|
|
struct flowi6 *fl6,
|
|
u8 type,
|
|
const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr,
|
|
int oif);
|
|
#endif
|