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Release 4.11 net/netfilter/xt_multiport.c

Directory: net/netfilter
/* Kernel module to match one of a list of TCP/UDP(-Lite)/SCTP/DCCP ports:
   ports are in the same place so we can treat them as equal. */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/types.h>
#include <linux/udp.h>
#include <linux/skbuff.h>
#include <linux/in.h>

#include <linux/netfilter/xt_multiport.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
MODULE_DESCRIPTION("Xtables: multiple port matching for TCP, UDP, UDP-Lite, SCTP and DCCP");
MODULE_ALIAS("ipt_multiport");
MODULE_ALIAS("ip6t_multiport");

/* Returns 1 if the port is matched by the test, 0 otherwise. */

static inline bool ports_match_v1(const struct xt_multiport_v1 *minfo, u_int16_t src, u_int16_t dst) { unsigned int i; u_int16_t s, e; for (i = 0; i < minfo->count; i++) { s = minfo->ports[i]; if (minfo->pflags[i]) { /* range port matching */ e = minfo->ports[++i]; pr_debug("src or dst matches with %d-%d?\n", s, e); switch (minfo->flags) { case XT_MULTIPORT_SOURCE: if (src >= s && src <= e) return true ^ minfo->invert; break; case XT_MULTIPORT_DESTINATION: if (dst >= s && dst <= e) return true ^ minfo->invert; break; case XT_MULTIPORT_EITHER: if ((dst >= s && dst <= e) || (src >= s && src <= e)) return true ^ minfo->invert; break; default: break; } } else { /* exact port matching */ pr_debug("src or dst matches with %d?\n", s); switch (minfo->flags) { case XT_MULTIPORT_SOURCE: if (src == s) return true ^ minfo->invert; break; case XT_MULTIPORT_DESTINATION: if (dst == s) return true ^ minfo->invert; break; case XT_MULTIPORT_EITHER: if (src == s || dst == s) return true ^ minfo->invert; break; default: break; } } } return minfo->invert; }

Contributors

PersonTokensPropCommitsCommitProp
Rusty Russell15260.56%112.50%
Gao Feng6023.90%225.00%
Phil Oester2710.76%112.50%
Yasuyuki Kozakai72.79%112.50%
Jan Engelhardt31.20%225.00%
Linus Torvalds (pre-git)20.80%112.50%
Total251100.00%8100.00%


static bool multiport_mt(const struct sk_buff *skb, struct xt_action_param *par) { const __be16 *pptr; __be16 _ports[2]; const struct xt_multiport_v1 *multiinfo = par->matchinfo; if (par->fragoff != 0) return false; pptr = skb_header_pointer(skb, par->thoff, sizeof(_ports), _ports); if (pptr == NULL) { /* We've been asked to examine this packet, and we * can't. Hence, no choice but to drop. */ pr_debug("Dropping evil offset=0 tinygram.\n"); par->hotdrop = true; return false; } return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1])); }

Contributors

PersonTokensPropCommitsCommitProp
Rusty Russell8374.11%19.09%
Jan Engelhardt2623.21%763.64%
Al Viro10.89%19.09%
Linus Torvalds (pre-git)10.89%19.09%
Yasuyuki Kozakai10.89%19.09%
Total112100.00%11100.00%


static inline bool check(u_int16_t proto, u_int8_t ip_invflags, u_int8_t match_flags, u_int8_t count) { /* Must specify supported protocol, no unknown flags or bad count */ return (proto == IPPROTO_TCP || proto == IPPROTO_UDP || proto == IPPROTO_UDPLITE || proto == IPPROTO_SCTP || proto == IPPROTO_DCCP) && !(ip_invflags & XT_INV_PROTO) && (match_flags == XT_MULTIPORT_SOURCE || match_flags == XT_MULTIPORT_DESTINATION || match_flags == XT_MULTIPORT_EITHER) && count <= XT_MULTI_PORTS; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai5479.41%125.00%
Patrick McHardy913.24%125.00%
Gerrit Renker45.88%125.00%
Jan Engelhardt11.47%125.00%
Total68100.00%4100.00%


static int multiport_mt_check(const struct xt_mtchk_param *par) { const struct ipt_ip *ip = par->entryinfo; const struct xt_multiport_v1 *multiinfo = par->matchinfo; return check(ip->proto, ip->invflags, multiinfo->flags, multiinfo->count) ? 0 : -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai4375.44%120.00%
Jan Engelhardt1424.56%480.00%
Total57100.00%5100.00%


static int multiport_mt6_check(const struct xt_mtchk_param *par) { const struct ip6t_ip6 *ip = par->entryinfo; const struct xt_multiport_v1 *multiinfo = par->matchinfo; return check(ip->proto, ip->invflags, multiinfo->flags, multiinfo->count) ? 0 : -EINVAL; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuyuki Kozakai4375.44%120.00%
Jan Engelhardt1424.56%480.00%
Total57100.00%5100.00%

static struct xt_match multiport_mt_reg[] __read_mostly = { { .name = "multiport", .family = NFPROTO_IPV4, .revision = 1, .checkentry = multiport_mt_check, .match = multiport_mt, .matchsize = sizeof(struct xt_multiport_v1), .me = THIS_MODULE, }, { .name = "multiport", .family = NFPROTO_IPV6, .revision = 1, .checkentry = multiport_mt6_check, .match = multiport_mt, .matchsize = sizeof(struct xt_multiport_v1), .me = THIS_MODULE, }, };
static int __init multiport_mt_init(void) { return xt_register_matches(multiport_mt_reg, ARRAY_SIZE(multiport_mt_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)945.00%120.00%
Yasuyuki Kozakai420.00%120.00%
Jan Engelhardt315.00%120.00%
Patrick McHardy315.00%120.00%
Rusty Russell15.00%120.00%
Total20100.00%5100.00%


static void __exit multiport_mt_exit(void) { xt_unregister_matches(multiport_mt_reg, ARRAY_SIZE(multiport_mt_reg)); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)947.37%125.00%
Yasuyuki Kozakai421.05%125.00%
Patrick McHardy315.79%125.00%
Jan Engelhardt315.79%125.00%
Total19100.00%4100.00%

module_init(multiport_mt_init); module_exit(multiport_mt_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Rusty Russell24833.20%13.57%
Yasuyuki Kozakai20126.91%13.57%
Jan Engelhardt8110.84%1346.43%
Gao Feng608.03%27.14%
Linus Torvalds (pre-git)547.23%13.57%
Patrick McHardy486.43%414.29%
Phil Oester273.61%13.57%
Harald Welte152.01%27.14%
Art Haas70.94%13.57%
Gerrit Renker50.67%13.57%
Al Viro10.13%13.57%
Total747100.00%28100.00%
Directory: net/netfilter
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