Release 4.11 net/ipv4/gre_demux.c
/*
* GRE over IPv4 demultiplexer driver
*
* Authors: Dmitry Kozlov (xeb@mail.ru)
*
* 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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/if.h>
#include <linux/icmp.h>
#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/skbuff.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
#include <linux/if_tunnel.h>
#include <linux/spinlock.h>
#include <net/protocol.h>
#include <net/gre.h>
#include <net/icmp.h>
#include <net/route.h>
#include <net/xfrm.h>
static const struct gre_protocol __rcu *gre_proto[GREPROTO_MAX] __read_mostly;
int gre_add_protocol(const struct gre_protocol *proto, u8 version)
{
if (version >= GREPROTO_MAX)
return -EINVAL;
return (cmpxchg((const struct gre_protocol **)&gre_proto[version], NULL, proto) == NULL) ?
0 : -EBUSY;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dmitry Kozlov | 32 | 59.26% | 1 | 50.00% |
Pravin B Shelar | 22 | 40.74% | 1 | 50.00% |
Total | 54 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(gre_add_protocol);
int gre_del_protocol(const struct gre_protocol *proto, u8 version)
{
int ret;
if (version >= GREPROTO_MAX)
return -EINVAL;
ret = (cmpxchg((const struct gre_protocol **)&gre_proto[version], proto, NULL) == proto) ?
0 : -EBUSY;
if (ret)
return ret;
synchronize_rcu();
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Pravin B Shelar | 65 | 91.55% | 3 | 75.00% |
Dmitry Kozlov | 6 | 8.45% | 1 | 25.00% |
Total | 71 | 100.00% | 4 | 100.00% |
EXPORT_SYMBOL_GPL(gre_del_protocol);
/* Fills in tpi and returns header length to be pulled. */
int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
bool *csum_err, __be16 proto, int nhs)
{
const struct gre_base_hdr *greh;
__be32 *options;
int hdr_len;
if (unlikely(!pskb_may_pull(skb, nhs + sizeof(struct gre_base_hdr))))
return -EINVAL;
greh = (struct gre_base_hdr *)(skb->data + nhs);
if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
return -EINVAL;
tpi->flags = gre_flags_to_tnl_flags(greh->flags);
hdr_len = gre_calc_hlen(tpi->flags);
if (!pskb_may_pull(skb, nhs + hdr_len))
return -EINVAL;
greh = (struct gre_base_hdr *)(skb->data + nhs);
tpi->proto = greh->protocol;
options = (__be32 *)(greh + 1);
if (greh->flags & GRE_CSUM) {
if (skb_checksum_simple_validate(skb)) {
*csum_err = true;
return -EINVAL;
}
skb_checksum_try_convert(skb, IPPROTO_GRE, 0,
null_compute_pseudo);
options++;
}
if (greh->flags & GRE_KEY) {
tpi->key = *options;
options++;
} else {
tpi->key = 0;
}
if (unlikely(greh->flags & GRE_SEQ)) {
tpi->seq = *options;
options++;
} else {
tpi->seq = 0;
}
/* WCCP version 1 and 2 protocol decoding.
* - Change protocol to IPv4/IPv6
* - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
*/
if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {
tpi->proto = proto;
if ((*(u8 *)options & 0xF0) != 0x40)
hdr_len += 4;
}
tpi->hdr_len = hdr_len;
return hdr_len;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Tom Herbert | 292 | 90.40% | 1 | 20.00% |
Eric Dumazet | 25 | 7.74% | 2 | 40.00% |
Haishuang Yan | 5 | 1.55% | 1 | 20.00% |
Jiri Benc | 1 | 0.31% | 1 | 20.00% |
Total | 323 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL(gre_parse_header);
static int gre_rcv(struct sk_buff *skb)
{
const struct gre_protocol *proto;
u8 ver;
int ret;
if (!pskb_may_pull(skb, 12))
goto drop;
ver = skb->data[1]&0x7f;
if (ver >= GREPROTO_MAX)
goto drop;
rcu_read_lock();
proto = rcu_dereference(gre_proto[ver]);
if (!proto || !proto->handler)
goto drop_unlock;
ret = proto->handler(skb);
rcu_read_unlock();
return ret;
drop_unlock:
rcu_read_unlock();
drop:
kfree_skb(skb);
return NET_RX_DROP;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dmitry Kozlov | 112 | 100.00% | 1 | 100.00% |
Total | 112 | 100.00% | 1 | 100.00% |
static void gre_err(struct sk_buff *skb, u32 info)
{
const struct gre_protocol *proto;
const struct iphdr *iph = (const struct iphdr *)skb->data;
u8 ver = skb->data[(iph->ihl<<2) + 1]&0x7f;
if (ver >= GREPROTO_MAX)
return;
rcu_read_lock();
proto = rcu_dereference(gre_proto[ver]);
if (proto && proto->err_handler)
proto->err_handler(skb, info);
rcu_read_unlock();
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dmitry Kozlov | 96 | 100.00% | 2 | 100.00% |
Total | 96 | 100.00% | 2 | 100.00% |
static const struct net_protocol net_gre_protocol = {
.handler = gre_rcv,
.err_handler = gre_err,
.netns_ok = 1,
};
static int __init gre_init(void)
{
pr_info("GRE over IPv4 demultiplexor driver\n");
if (inet_add_protocol(&net_gre_protocol, IPPROTO_GRE) < 0) {
pr_err("can't add protocol\n");
return -EAGAIN;
}
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dmitry Kozlov | 29 | 72.50% | 1 | 25.00% |
Pravin B Shelar | 9 | 22.50% | 2 | 50.00% |
Joe Perches | 2 | 5.00% | 1 | 25.00% |
Total | 40 | 100.00% | 4 | 100.00% |
static void __exit gre_exit(void)
{
inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dmitry Kozlov | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
module_init(gre_init);
module_exit(gre_exit);
MODULE_DESCRIPTION("GRE over IPv4 demultiplexer driver");
MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
MODULE_LICENSE("GPL");
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dmitry Kozlov | 386 | 45.68% | 2 | 14.29% |
Tom Herbert | 297 | 35.15% | 1 | 7.14% |
Pravin B Shelar | 119 | 14.08% | 4 | 28.57% |
Eric Dumazet | 26 | 3.08% | 3 | 21.43% |
Joe Perches | 9 | 1.07% | 1 | 7.14% |
Haishuang Yan | 5 | 0.59% | 1 | 7.14% |
Jiri Benc | 2 | 0.24% | 1 | 7.14% |
Stephen Hemminger | 1 | 0.12% | 1 | 7.14% |
Total | 845 | 100.00% | 14 | 100.00% |
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