cregit-Linux how code gets into the kernel

Release 4.14 net/ipv6/ipcomp6.c

Directory: net/ipv6
/*
 * IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173
 *
 * Copyright (C)2003 USAGI/WIDE Project
 *
 * Author       Mitsuru KANDA  <mk@linux-ipv6.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
/*
 * [Memo]
 *
 * Outbound:
 *  The compression of IP datagram MUST be done before AH/ESP processing,
 *  fragmentation, and the addition of Hop-by-Hop/Routing header.
 *
 * Inbound:
 *  The decompression of IP datagram MUST be done after the reassembly,
 *  AH/ESP processing.
 */


#define pr_fmt(fmt) "IPv6: " fmt

#include <linux/module.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/ipcomp.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/pfkeyv2.h>
#include <linux/random.h>
#include <linux/percpu.h>
#include <linux/smp.h>
#include <linux/list.h>
#include <linux/vmalloc.h>
#include <linux/rtnetlink.h>
#include <net/ip6_route.h>
#include <net/icmp.h>
#include <net/ipv6.h>
#include <net/protocol.h>
#include <linux/ipv6.h>
#include <linux/icmpv6.h>
#include <linux/mutex.h>


static int ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, u8 type, u8 code, int offset, __be32 info) { struct net *net = dev_net(skb->dev); __be32 spi; const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; struct ip_comp_hdr *ipcomph = (struct ip_comp_hdr *)(skb->data + offset); struct xfrm_state *x; if (type != ICMPV6_PKT_TOOBIG && type != NDISC_REDIRECT) return 0; spi = htonl(ntohs(ipcomph->cpi)); x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, spi, IPPROTO_COMP, AF_INET6); if (!x) return 0; if (type == NDISC_REDIRECT) ip6_redirect(skb, net, skb->dev->ifindex, 0, sock_net_uid(net, NULL)); else ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); xfrm_state_put(x); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu9145.73%426.67%
David S. Miller2914.57%213.33%
Mitsuru Kanda2713.57%16.67%
Lorenzo Colitti147.04%16.67%
Alexey Dobriyan147.04%213.33%
Steffen Klassert105.03%16.67%
Duan Jiong52.51%16.67%
Jamal Hadi Salim42.01%16.67%
Eric Dumazet31.51%16.67%
Brian Haley21.01%16.67%
Total199100.00%15100.00%


static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x) { struct net *net = xs_net(x); struct xfrm_state *t = NULL; t = xfrm_state_alloc(net); if (!t) goto out; t->id.proto = IPPROTO_IPV6; t->id.spi = xfrm6_tunnel_alloc_spi(net, (xfrm_address_t *)&x->props.saddr); if (!t->id.spi) goto error; memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr)); memcpy(&t->sel, &x->sel, sizeof(t->sel)); t->props.family = AF_INET6; t->props.mode = x->props.mode; memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr)); memcpy(&t->mark, &x->mark, sizeof(t->mark)); if (xfrm_init_state(t)) goto error; atomic_set(&t->tunnel_users, 1); out: return t; error: t->km.state = XFRM_STATE_DEAD; xfrm_state_put(t); t = NULL; goto out; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu20985.66%450.00%
Jamal Hadi Salim208.20%112.50%
Alexey Dobriyan156.15%337.50%
Total244100.00%8100.00%


static int ipcomp6_tunnel_attach(struct xfrm_state *x) { struct net *net = xs_net(x); int err = 0; struct xfrm_state *t = NULL; __be32 spi; u32 mark = x->mark.m & x->mark.v; spi = xfrm6_tunnel_spi_lookup(net, (xfrm_address_t *)&x->props.saddr); if (spi) t = xfrm_state_lookup(net, mark, (xfrm_address_t *)&x->id.daddr, spi, IPPROTO_IPV6, AF_INET6); if (!t) { t = ipcomp6_tunnel_create(x); if (!t) { err = -EINVAL; goto out; } xfrm_state_insert(t); xfrm_state_hold(t); } x->tunnel = t; atomic_inc(&t->tunnel_users); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu12680.25%233.33%
Jamal Hadi Salim1710.83%116.67%
Alexey Dobriyan148.92%350.00%
Total157100.00%6100.00%


static int ipcomp6_init_state(struct xfrm_state *x) { int err = -EINVAL; x->props.header_len = 0; switch (x->props.mode) { case XFRM_MODE_TRANSPORT: break; case XFRM_MODE_TUNNEL: x->props.header_len += sizeof(struct ipv6hdr); break; default: goto out; } err = ipcomp_init_state(x); if (err) goto out; if (x->props.mode == XFRM_MODE_TUNNEL) { err = ipcomp6_tunnel_attach(x); if (err) goto out; } err = 0; out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Mitsuru Kanda4541.67%110.00%
Herbert Xu3532.41%660.00%
Hideaki Yoshifuji / 吉藤英明2321.30%110.00%
David S. Miller32.78%110.00%
Masahide Nakamura21.85%110.00%
Total108100.00%10100.00%


static int ipcomp6_rcv_cb(struct sk_buff *skb, int err) { return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Steffen Klassert17100.00%1100.00%
Total17100.00%1100.00%

static const struct xfrm_type ipcomp6_type = { .description = "IPCOMP6", .owner = THIS_MODULE, .proto = IPPROTO_COMP, .init_state = ipcomp6_init_state, .destructor = ipcomp_destroy, .input = ipcomp_input, .output = ipcomp_output, .hdr_offset = xfrm6_find_1stfragopt, }; static struct xfrm6_protocol ipcomp6_protocol = { .handler = xfrm6_rcv, .cb_handler = ipcomp6_rcv_cb, .err_handler = ipcomp6_err, .priority = 0, };
static int __init ipcomp6_init(void) { if (xfrm_register_type(&ipcomp6_type, AF_INET6) < 0) { pr_info("%s: can't add xfrm type\n", __func__); return -EAGAIN; } if (xfrm6_protocol_register(&ipcomp6_protocol, IPPROTO_COMP) < 0) { pr_info("%s: can't add protocol\n", __func__); xfrm_unregister_type(&ipcomp6_type, AF_INET6); return -EAGAIN; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mitsuru Kanda6187.14%133.33%
Joe Perches811.43%133.33%
Steffen Klassert11.43%133.33%
Total70100.00%3100.00%


static void __exit ipcomp6_fini(void) { if (xfrm6_protocol_deregister(&ipcomp6_protocol, IPPROTO_COMP) < 0) pr_info("%s: can't remove protocol\n", __func__); if (xfrm_unregister_type(&ipcomp6_type, AF_INET6) < 0) pr_info("%s: can't remove xfrm type\n", __func__); }

Contributors

PersonTokensPropCommitsCommitProp
Mitsuru Kanda3880.85%133.33%
Joe Perches817.02%133.33%
Steffen Klassert12.13%133.33%
Total47100.00%3100.00%

module_init(ipcomp6_init); module_exit(ipcomp6_fini); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("IP Payload Compression Protocol (IPComp) for IPv6 - RFC3173"); MODULE_AUTHOR("Mitsuru KANDA <mk@linux-ipv6.org>"); MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_COMP);

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu48247.35%1029.41%
Mitsuru Kanda28728.19%12.94%
Alexey Dobriyan434.22%411.76%
Jamal Hadi Salim414.03%12.94%
Steffen Klassert373.63%12.94%
David S. Miller353.44%38.82%
Hideaki Yoshifuji / 吉藤英明242.36%25.88%
Joe Perches232.26%12.94%
Masahide Nakamura141.38%38.82%
Lorenzo Colitti141.38%12.94%
Duan Jiong50.49%12.94%
Eric Dumazet40.39%25.88%
Arjan van de Ven30.29%12.94%
Arnaldo Carvalho de Melo30.29%12.94%
Brian Haley20.20%12.94%
Jeff Kirsher10.10%12.94%
Total1018100.00%34100.00%
Directory: net/ipv6
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