forked from mirrors/linux
058a8f7f73
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>
59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the IP protocol.
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*
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* Version: @(#)ip.h 1.0.2 04/28/93
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*
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* Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*/
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#ifndef _LINUX_IP_H
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#define _LINUX_IP_H
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#include <linux/skbuff.h>
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#include <uapi/linux/ip.h>
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static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
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{
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return (struct iphdr *)skb_network_header(skb);
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}
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static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
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{
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return (struct iphdr *)skb_inner_network_header(skb);
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}
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static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
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{
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return (struct iphdr *)skb_transport_header(skb);
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}
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static inline unsigned int ip_transport_len(const struct sk_buff *skb)
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{
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return ntohs(ip_hdr(skb)->tot_len) - skb_network_header_len(skb);
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}
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static inline unsigned int iph_totlen(const struct sk_buff *skb, const struct iphdr *iph)
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{
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u32 len = ntohs(iph->tot_len);
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return (len || !skb_is_gso(skb) || !skb_is_gso_tcp(skb)) ?
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len : skb->len - skb_network_offset(skb);
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}
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static inline unsigned int skb_ip_totlen(const struct sk_buff *skb)
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{
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return iph_totlen(skb, ip_hdr(skb));
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}
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/* IPv4 datagram length is stored into 16bit field (tot_len) */
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#define IP_MAX_MTU 0xFFFFU
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static inline void iph_set_totlen(struct iphdr *iph, unsigned int len)
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{
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iph->tot_len = len <= IP_MAX_MTU ? htons(len) : 0;
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}
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#endif /* _LINUX_IP_H */
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