diff options
Diffstat (limited to 'net/ipv4/ip_output.c')
| -rw-r--r-- | net/ipv4/ip_output.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 0bc95f3977d2..0d5e5672f3d1 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -319,6 +319,20 @@ int ip_output(struct sk_buff *skb) !(IPCB(skb)->flags & IPSKB_REROUTED)); } +/* + * copy saddr and daddr, possibly using 64bit load/stores + * Equivalent to : + * iph->saddr = fl4->saddr; + * iph->daddr = fl4->daddr; + */ +static void ip_copy_addrs(struct iphdr *iph, const struct flowi4 *fl4) +{ + BUILD_BUG_ON(offsetof(typeof(*fl4), daddr) != + offsetof(typeof(*fl4), saddr) + sizeof(fl4->saddr)); + memcpy(&iph->saddr, &fl4->saddr, + sizeof(fl4->saddr) + sizeof(fl4->daddr)); +} + int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl) { struct sock *sk = skb->sk; @@ -381,8 +395,8 @@ packet_routed: iph->frag_off = 0; iph->ttl = ip_select_ttl(inet, &rt->dst); iph->protocol = sk->sk_protocol; - iph->saddr = fl4->saddr; - iph->daddr = fl4->daddr; + ip_copy_addrs(iph, fl4); + /* Transport layer set skb->h.foo itself. */ if (inet_opt && inet_opt->opt.optlen) { @@ -1337,8 +1351,7 @@ struct sk_buff *__ip_make_skb(struct sock *sk, ip_select_ident(iph, &rt->dst, sk); iph->ttl = ttl; iph->protocol = sk->sk_protocol; - iph->saddr = fl4->saddr; - iph->daddr = fl4->daddr; + ip_copy_addrs(iph, fl4); if (opt) { iph->ihl += opt->optlen>>2; |