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ipv6: icmp: add a force_saddr param to icmp6_send()

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SIT or GRE tunnels might want to translate an IPV4 address
into a v4mapped one when translating ICMP to ICMPv6.

This patch adds the parameter to icmp6_send() but
does not change icmpv6_send() signature.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2016-06-18 21:52:02 -07:00 • committed by David S. Miller
parent adc01582e3
commit b1cadc1a09
3 changed files with 8 additions and 4 deletions
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3
include/linux/icmpv6.h
View file

@ -14,7 +14,8 @@ static inline struct icmp6hdr *icmp6_hdr(const struct sk_buff *skb)
#if IS_ENABLED(CONFIG_IPV6) #if IS_ENABLED(CONFIG_IPV6)
extern void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info); 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); 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_register_icmp_sender(ip6_icmp_send_t *fn);
extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn); extern int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn);

7
net/ipv6/icmp.c
View file

@ -388,7 +388,8 @@ relookup_failed:
/* /*
* Send an ICMP message in response to a packet in error * Send an ICMP message in response to a packet in error
*/ */
static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info) static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info,
const struct in6_addr *force_saddr)
{ {
struct net *net = dev_net(skb->dev); struct net *net = dev_net(skb->dev);
struct inet6_dev *idev = NULL; struct inet6_dev *idev = NULL;
@ -475,6 +476,8 @@ static void icmp6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
memset(&fl6, 0, sizeof(fl6)); memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_proto = IPPROTO_ICMPV6; fl6.flowi6_proto = IPPROTO_ICMPV6;
fl6.daddr = hdr->saddr; fl6.daddr = hdr->saddr;
if (force_saddr)
saddr = force_saddr;
if (saddr) if (saddr)
fl6.saddr = *saddr; fl6.saddr = *saddr;
fl6.flowi6_mark = mark; fl6.flowi6_mark = mark;
@ -551,7 +554,7 @@ out:
*/ */
void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos) void icmpv6_param_prob(struct sk_buff *skb, u8 code, int pos)
{ {
icmp6_send(skb, ICMPV6_PARAMPROB, code, pos); icmp6_send(skb, ICMPV6_PARAMPROB, code, pos, NULL);
kfree_skb(skb); kfree_skb(skb);
} }

2
net/ipv6/ip6_icmp.c
View file

@ -39,7 +39,7 @@ void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
if (!send) if (!send)
goto out; goto out;
send(skb, type, code, info); send(skb, type, code, info, NULL);
out: out:
rcu_read_unlock(); rcu_read_unlock();
} }