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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110// SPDX-License-Identifier: GPL-2.0-or-later/* Kernel module to match IPComp parameters for IPv4 and IPv6 * * Copyright (C) 2013 WindRiver * * Author: * Fan Du <fan.du@windriver.com> * * Based on: * net/netfilter/xt_esp.c */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt#include <linux/in.h>#include <linux/module.h>#include <linux/skbuff.h>#include <linux/ip.h>
#include <linux/netfilter/xt_ipcomp.h>#include <linux/netfilter/x_tables.h>
MODULE_LICENSE("GPL");MODULE_AUTHOR("Fan Du <fan.du@windriver.com>");MODULE_DESCRIPTION("Xtables: IPv4/6 IPsec-IPComp SPI match");MODULE_ALIAS("ipt_ipcomp");MODULE_ALIAS("ip6t_ipcomp");
/* Returns 1 if the spi is matched by the range, 0 otherwise */static inline boolspi_match(u_int32_t min, u_int32_t max, u_int32_t spi, bool invert){ bool r; pr_debug("spi_match:%c 0x%x <= 0x%x <= 0x%x\n", invert ? '!' : ' ', min, spi, max); r = (spi >= min && spi <= max) ^ invert; pr_debug(" result %s\n", r ? "PASS" : "FAILED"); return r;}
static bool comp_mt(const struct sk_buff *skb, struct xt_action_param *par){ struct ip_comp_hdr _comphdr; const struct ip_comp_hdr *chdr; const struct xt_ipcomp *compinfo = par->matchinfo;
/* Must not be a fragment. */ if (par->fragoff != 0) return false;
chdr = skb_header_pointer(skb, par->thoff, sizeof(_comphdr), &_comphdr); if (chdr == NULL) { /* We've been asked to examine this packet, and we * can't. Hence, no choice but to drop. */ pr_debug("Dropping evil IPComp tinygram.\n"); par->hotdrop = true; return false; }
return spi_match(compinfo->spis[0], compinfo->spis[1], ntohs(chdr->cpi), !!(compinfo->invflags & XT_IPCOMP_INV_SPI));}
static int comp_mt_check(const struct xt_mtchk_param *par){ const struct xt_ipcomp *compinfo = par->matchinfo;
/* Must specify no unknown invflags */ if (compinfo->invflags & ~XT_IPCOMP_INV_MASK) { pr_info_ratelimited("unknown flags %X\n", compinfo->invflags); return -EINVAL; } return 0;}
static struct xt_match comp_mt_reg[] __read_mostly = { { .name = "ipcomp", .family = NFPROTO_IPV4, .match = comp_mt, .matchsize = sizeof(struct xt_ipcomp), .proto = IPPROTO_COMP, .checkentry = comp_mt_check, .me = THIS_MODULE, }, { .name = "ipcomp", .family = NFPROTO_IPV6, .match = comp_mt, .matchsize = sizeof(struct xt_ipcomp), .proto = IPPROTO_COMP, .checkentry = comp_mt_check, .me = THIS_MODULE, },};
static int __init comp_mt_init(void){ return xt_register_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg));}
static void __exit comp_mt_exit(void){ xt_unregister_matches(comp_mt_reg, ARRAY_SIZE(comp_mt_reg));}
module_init(comp_mt_init);module_exit(comp_mt_exit);