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net: add a couple of helpers for iph tot_len

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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@gmail.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xin Long 2023-01-28 10:58:30 -05:00 committed by Jakub Kicinski
parent d8673afbf5
commit 058a8f7f73
2 changed files with 21 additions and 3 deletions
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21
include/linux/ip.h
View File

@ -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 */

3
include/net/route.h
View File

@ -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))