cregit-Linux how code gets into the kernel

Release 4.11 net/ipv4/netfilter/nf_nat_proto_icmp.c

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2006 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.
 */

#include <linux/types.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/ip.h>
#include <linux/icmp.h>

#include <linux/netfilter.h>
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_nat_l4proto.h>


static bool icmp_in_range(const struct nf_conntrack_tuple *tuple, enum nf_nat_manip_type maniptype, const union nf_conntrack_man_proto *min, const union nf_conntrack_man_proto *max) { return ntohs(tuple->src.u.icmp.id) >= ntohs(min->icmp.id) && ntohs(tuple->src.u.icmp.id) <= ntohs(max->icmp.id); }

Contributors

PersonTokensPropCommitsCommitProp
Jozsef Kadlecsik7298.63%150.00%
Jan Engelhardt11.37%150.00%
Total73100.00%2100.00%


static void icmp_unique_tuple(const struct nf_nat_l3proto *l3proto, struct nf_conntrack_tuple *tuple, const struct nf_nat_range *range, enum nf_nat_manip_type maniptype, const struct nf_conn *ct) { static u_int16_t id; unsigned int range_size; unsigned int i; range_size = ntohs(range->max_proto.icmp.id) - ntohs(range->min_proto.icmp.id) + 1; /* If no range specified... */ if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)) range_size = 0xFFFF; for (i = 0; ; ++id) { tuple->src.u.icmp.id = htons(ntohs(range->min_proto.icmp.id) + (id % range_size)); if (++i == range_size || !nf_nat_used_tuple(tuple, ct)) return; } return; }

Contributors

PersonTokensPropCommitsCommitProp
Jozsef Kadlecsik12786.99%120.00%
Patrick McHardy117.53%240.00%
Changli Gao85.48%240.00%
Total146100.00%5100.00%


static bool icmp_manip_pkt(struct sk_buff *skb, const struct nf_nat_l3proto *l3proto, unsigned int iphdroff, unsigned int hdroff, const struct nf_conntrack_tuple *tuple, enum nf_nat_manip_type maniptype) { struct icmphdr *hdr; if (!skb_make_writable(skb, hdroff + sizeof(*hdr))) return false; hdr = (struct icmphdr *)(skb->data + hdroff); inet_proto_csum_replace2(&hdr->checksum, skb, hdr->un.echo.id, tuple->src.u.icmp.id, false); hdr->un.echo.id = tuple->src.u.icmp.id; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Jozsef Kadlecsik10684.80%116.67%
Patrick McHardy118.80%233.33%
Herbert Xu43.20%116.67%
Jan Engelhardt32.40%116.67%
Tom Herbert10.80%116.67%
Total125100.00%6100.00%

const struct nf_nat_l4proto nf_nat_l4proto_icmp = { .l4proto = IPPROTO_ICMP, .manip_pkt = icmp_manip_pkt, .in_range = icmp_in_range, .unique_tuple = icmp_unique_tuple, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) .nlattr_to_range = nf_nat_l4proto_nlattr_to_range, #endif };

Overall Contributors

PersonTokensPropCommitsCommitProp
Jozsef Kadlecsik36287.65%17.14%
Patrick McHardy307.26%642.86%
Changli Gao81.94%214.29%
Jan Engelhardt40.97%17.14%
Herbert Xu40.97%17.14%
Paul Gortmaker30.73%17.14%
Tom Herbert10.24%17.14%
Duan Jiong10.24%17.14%
Total413100.00%14100.00%
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