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| 2 | |
| 3 | * INET An implementation of the TCP/IP protocol suite for the LINUX
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| 4 | * operating system. INET is implemented using the BSD Socket
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| 5 | * interface as the means of communication with the user level.
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| 6 | *
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| 7 | * Definitions for the IP protocol.
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| 8 | *
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| 9 | * Version: @(#)ip.h 1.0.2 04/28/93
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| 10 | *
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| 11 | * Authors: Fred N. van Kempen, <[email protected]>
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| 12 |
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| 13 | #ifndef _LINUX_IP_H
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| 14 | #define _LINUX_IP_H
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| 15 |
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| 16 | #include <linux/skbuff.h>
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| 17 | #include <uapi/linux/ip.h>
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| 18 |
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| 19 | static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
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| 20 | {
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| 21 | return (struct iphdr *)skb_network_header(skb);
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| 22 | }
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| 23 |
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| 24 | static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
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| 25 | {
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| 26 | return (struct iphdr *)skb_inner_network_header(skb);
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| 27 | }
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| 28 |
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| 29 | static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
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| 30 | {
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| 31 | return (struct iphdr *)skb_transport_header(skb);
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| 32 | }
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| 33 |
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| 34 | static inline unsigned int ip_transport_len(const struct sk_buff *skb)
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| 35 | {
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| 36 | return ntohs(ip_hdr(skb)->tot_len) - skb_network_header_len(skb);
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| 37 | }
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| 38 |
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| 39 | static inline unsigned int iph_totlen(const struct sk_buff *skb, const struct iphdr *iph)
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| 40 | {
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| 41 | u32 len = ntohs(iph->tot_len);
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| 42 |
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| 43 | return (len || !skb_is_gso(skb) || !skb_is_gso_tcp(skb)) ?
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| 44 | len : skb->len - skb_network_offset(skb);
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| 45 | }
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| 46 |
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| 47 | static inline unsigned int skb_ip_totlen(const struct sk_buff *skb)
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| 48 | {
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| 49 | return iph_totlen(skb, ip_hdr(skb));
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| 50 | }
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| 51 |
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| 52 |
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| 53 | #define IP_MAX_MTU 0xFFFFU
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| 54 |
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| 55 | static inline void iph_set_totlen(struct iphdr *iph, unsigned int len)
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| 56 | {
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| 57 | iph->tot_len = len <= IP_MAX_MTU ? htons(len) : 0;
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| 58 | }
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| 59 | #endif
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