From: Xin Long <lucien.xin@xxxxxxxxx>
[ Upstream commit 058a8f7f73aae1cc22b53fcefec031b9e391b54d ]
This patch adds three APIs to replace the iph->tot_len setting
and getting in all places where IPv4 BIG TCP packets may reach,
they will be used in the following patches.
Note that iph_totlen() will be used when iph is not in linear
data of the skb.
Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Reviewed-by: David Ahern <dsahern@xxxxxxxxxx>
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Stable-dep-of: b2dc32dcba08 ("net/sched: act_ipt: add sanity checks on skb before calling target")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/linux/ip.h | 21 +++++++++++++++++++++
include/net/route.h | 3 ---
2 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/include/linux/ip.h b/include/linux/ip.h
index 3d9c6750af627..d11c25f5030a0 100644
--- a/include/linux/ip.h
+++ b/include/linux/ip.h
@@ -35,4 +35,25 @@ static inline unsigned int ip_transport_len(const struct sk_buff *skb)
{
return ntohs(ip_hdr(skb)->tot_len) - skb_network_header_len(skb);
}
+
+static inline unsigned int iph_totlen(const struct sk_buff *skb, const struct iphdr *iph)
+{
+ u32 len = ntohs(iph->tot_len);
+
+ return (len || !skb_is_gso(skb) || !skb_is_gso_tcp(skb)) ?
+ len : skb->len - skb_network_offset(skb);
+}
+
+static inline unsigned int skb_ip_totlen(const struct sk_buff *skb)
+{
+ return iph_totlen(skb, ip_hdr(skb));
+}
+
+/* IPv4 datagram length is stored into 16bit field (tot_len) */
+#define IP_MAX_MTU 0xFFFFU
+
+static inline void iph_set_totlen(struct iphdr *iph, unsigned int len)
+{
+ iph->tot_len = len <= IP_MAX_MTU ? htons(len) : 0;
+}
#endif /* _LINUX_IP_H */
diff --git a/include/net/route.h b/include/net/route.h
index 6e92dd5bcd613..fe00b0a2e4759 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -35,9 +35,6 @@
#include <linux/cache.h>
#include <linux/security.h>
-/* IPv4 datagram length is stored into 16bit field (tot_len) */
-#define IP_MAX_MTU 0xFFFFU
-
#define RTO_ONLINK 0x01
#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
--
2.39.2
