ipv6: RFC 4884 partial support for SIT/GRE tunnels

[mirror_ubuntu-artful-kernel.git] / net / ipv4 / ip_gre.c

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index ab4cff8e563dd1226af21cea650b3ccdbb122aa4..8eec78f53f9e540c64c0ab4c0f2ac01662c39bd3 100644 (file)
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -144,6 +144,7 @@ static void ipgre_err(struct sk_buff *skb, u32 info,
        const struct iphdr *iph;
        const int type = icmp_hdr(skb)->type;
        const int code = icmp_hdr(skb)->code;
+       unsigned int data_len = 0;
        struct ip_tunnel *t;
 
        switch (type) {
@@ -169,6 +170,7 @@ static void ipgre_err(struct sk_buff *skb, u32 info,
        case ICMP_TIME_EXCEEDED:
                if (code != ICMP_EXC_TTL)
                        return;
+               data_len = icmp_hdr(skb)->un.reserved[1] * 4; /* RFC 4884 4.1 */
                break;
 
        case ICMP_REDIRECT:
@@ -189,7 +191,8 @@ static void ipgre_err(struct sk_buff *skb, u32 info,
 
 #if IS_ENABLED(CONFIG_IPV6)
        if (tpi->proto == htons(ETH_P_IPV6) &&
-           !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len, type))
+           !ip6_err_gen_icmpv6_unreach(skb, iph->ihl * 4 + tpi->hdr_len,
+                                      type, data_len))
                return;
 #endif