diff options
Diffstat (limited to 'net/core/flow_dissector.c')
| -rw-r--r-- | net/core/flow_dissector.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c index f0516d9280c3..0985b9b14b80 100644 --- a/net/core/flow_dissector.c +++ b/net/core/flow_dissector.c @@ -8,6 +8,16 @@ #include <linux/ppp_defs.h> #include <net/flow_keys.h> +/* copy saddr & daddr, possibly using 64bit load/store + * Equivalent to : flow->src = iph->saddr; + * flow->dst = iph->daddr; + */ +static void iph_to_flow_copy_addrs(struct flow_keys *flow, const struct iphdr *iph) +{ + BUILD_BUG_ON(offsetof(typeof(*flow), dst) != + offsetof(typeof(*flow), src) + sizeof(flow->src)); + memcpy(&flow->src, &iph->saddr, sizeof(flow->src) + sizeof(flow->dst)); +} bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) { @@ -31,8 +41,7 @@ ip: ip_proto = 0; else ip_proto = iph->protocol; - flow->src = iph->saddr; - flow->dst = iph->daddr; + iph_to_flow_copy_addrs(flow, iph); nhoff += iph->ihl * 4; break; } |