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Linux/net/netfilter/xt_ipcomp.c

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Diff markup

Differences between /net/netfilter/xt_ipcomp.c (Version linux-4.7.10) and /net/netfilter/xt_ipcomp.c (Version linux-5.4.131)


** Warning: Cannot open xref database.

  1 /*  Kernel module to match IPComp parameters f      1 
  2  *                                                
  3  *  Copyright (C) 2013 WindRiver                  
  4  *                                                
  5  *  Author:                                       
  6  *  Fan Du <fan.du@windriver.com>                 
  7  *                                                
  8  *  Based on:                                     
  9  *  net/netfilter/xt_esp.c                        
 10  *                                                
 11  *  This program is free software; you can red    
 12  *  modify it under the terms of the GNU Gener    
 13  *  as published by the Free Software Foundati    
 14  *  2 of the License, or (at your option) any     
 15  */                                               
 16                                                   
 17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt       
 18 #include <linux/in.h>                             
 19 #include <linux/module.h>                         
 20 #include <linux/skbuff.h>                         
 21 #include <linux/ip.h>                             
 22                                                   
 23 #include <linux/netfilter/xt_ipcomp.h>            
 24 #include <linux/netfilter/x_tables.h>             
 25                                                   
 26 MODULE_LICENSE("GPL");                            
 27 MODULE_AUTHOR("Fan Du <fan.du@windriver.com>")    
 28 MODULE_DESCRIPTION("Xtables: IPv4/6 IPsec-IPCo    
 29                                                   
 30 /* Returns 1 if the spi is matched by the rang    
 31 static inline bool                                
 32 spi_match(u_int32_t min, u_int32_t max, u_int3    
 33 {                                                 
 34         bool r;                                   
 35         pr_debug("spi_match:%c 0x%x <= 0x%x <=    
 36                  invert ? '!' : ' ', min, spi,    
 37         r = (spi >= min && spi <= max) ^ inver    
 38         pr_debug(" result %s\n", r ? "PASS" :     
 39         return r;                                 
 40 }                                                 
 41                                                   
 42 static bool comp_mt(const struct sk_buff *skb,    
 43 {                                                 
 44         struct ip_comp_hdr _comphdr;              
 45         const struct ip_comp_hdr *chdr;           
 46         const struct xt_ipcomp *compinfo = par    
 47                                                   
 48         /* Must not be a fragment. */             
 49         if (par->fragoff != 0)                    
 50                 return false;                     
 51                                                   
 52         chdr = skb_header_pointer(skb, par->th    
 53         if (chdr == NULL) {                       
 54                 /* We've been asked to examine    
 55                  * can't.  Hence, no choice bu    
 56                  */                               
 57                 pr_debug("Dropping evil IPComp    
 58                 par->hotdrop = true;              
 59                 return 0;                         
 60         }                                         
 61                                                   
 62         return spi_match(compinfo->spis[0], co    
 63                          ntohs(chdr->cpi),        
 64                          !!(compinfo->invflags    
 65 }                                                 
 66                                                   
 67 static int comp_mt_check(const struct xt_mtchk    
 68 {                                                 
 69         const struct xt_ipcomp *compinfo = par    
 70                                                   
 71         /* Must specify no unknown invflags */    
 72         if (compinfo->invflags & ~XT_IPCOMP_IN    
 73                 pr_err("unknown flags %X\n", c    
 74                 return -EINVAL;                   
 75         }                                         
 76         return 0;                                 
 77 }                                                 
 78                                                   
 79 static struct xt_match comp_mt_reg[] __read_mo    
 80         {                                         
 81                 .name           = "ipcomp",       
 82                 .family         = NFPROTO_IPV4    
 83                 .match          = comp_mt,        
 84                 .matchsize      = sizeof(struc    
 85                 .proto          = IPPROTO_COMP    
 86                 .checkentry     = comp_mt_chec    
 87                 .me             = THIS_MODULE,    
 88         },                                        
 89         {                                         
 90                 .name           = "ipcomp",       
 91                 .family         = NFPROTO_IPV6    
 92                 .match          = comp_mt,        
 93                 .matchsize      = sizeof(struc    
 94                 .proto          = IPPROTO_COMP    
 95                 .checkentry     = comp_mt_chec    
 96                 .me             = THIS_MODULE,    
 97         },                                        
 98 };                                                
 99                                                   
100 static int __init comp_mt_init(void)              
101 {                                                 
102         return xt_register_matches(comp_mt_reg    
103 }                                                 
104                                                   
105 static void __exit comp_mt_exit(void)             
106 {                                                 
107         xt_unregister_matches(comp_mt_reg, ARR    
108 }                                                 
109                                                   
110 module_init(comp_mt_init);                        
111 module_exit(comp_mt_exit);                        
112                                                   

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