diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/route.h | 16 | ||||
| -rw-r--r-- | include/uapi/linux/in.h | 5 |
2 files changed, 17 insertions, 4 deletions
diff --git a/include/net/route.h b/include/net/route.h index dd4ae0029fd8..f68c167280a7 100644 --- a/include/net/route.h +++ b/include/net/route.h @@ -313,12 +313,20 @@ static inline int ip4_dst_hoplimit(const struct dst_entry *dst) return hoplimit; } -static inline int ip_skb_dst_mtu(struct sk_buff *skb) +static inline bool ip_sk_accept_pmtu(const struct sock *sk) { - struct inet_sock *inet = skb->sk ? inet_sk(skb->sk) : NULL; + return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE; +} - return (inet && inet->pmtudisc == IP_PMTUDISC_PROBE) ? - skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); +static inline bool ip_sk_use_pmtu(const struct sock *sk) +{ + return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; +} + +static inline int ip_skb_dst_mtu(const struct sk_buff *skb) +{ + return (!skb->sk || ip_sk_use_pmtu(skb->sk)) ? + dst_mtu(skb_dst(skb)) : skb_dst(skb)->dev->mtu; } #endif /* _ROUTE_H */ diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h index f9e8e496ae5d..393c5de09d42 100644 --- a/include/uapi/linux/in.h +++ b/include/uapi/linux/in.h @@ -115,6 +115,11 @@ struct in_addr { #define IP_PMTUDISC_WANT 1 /* Use per route hints */ #define IP_PMTUDISC_DO 2 /* Always DF */ #define IP_PMTUDISC_PROBE 3 /* Ignore dst pmtu */ +/* Always use interface mtu (ignores dst pmtu) but don't set DF flag. + * Also incoming ICMP frag_needed notifications will be ignored on + * this socket to prevent accepting spoofed ones. + */ +#define IP_PMTUDISC_INTERFACE 4 #define IP_MULTICAST_IF 32 #define IP_MULTICAST_TTL 33 |
