summaryrefslogtreecommitdiff
path: root/net/ipv4/gre.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/gre.c')
-rw-r--r--net/ipv4/gre.c253
1 files changed, 0 insertions, 253 deletions
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
deleted file mode 100644
index 7856d1651d05..000000000000
--- a/net/ipv4/gre.c
+++ /dev/null
@@ -1,253 +0,0 @@
-/*
- * 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/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>
-
-
-static const struct gre_protocol __rcu *gre_proto[GREPROTO_MAX] __read_mostly;
-static DEFINE_SPINLOCK(gre_proto_lock);
-
-int gre_add_protocol(const struct gre_protocol *proto, u8 version)
-{
- if (version >= GREPROTO_MAX)
- goto err_out;
-
- spin_lock(&gre_proto_lock);
- if (gre_proto[version])
- goto err_out_unlock;
-
- RCU_INIT_POINTER(gre_proto[version], proto);
- spin_unlock(&gre_proto_lock);
- return 0;
-
-err_out_unlock:
- spin_unlock(&gre_proto_lock);
-err_out:
- return -1;
-}
-EXPORT_SYMBOL_GPL(gre_add_protocol);
-
-int gre_del_protocol(const struct gre_protocol *proto, u8 version)
-{
- if (version >= GREPROTO_MAX)
- goto err_out;
-
- spin_lock(&gre_proto_lock);
- if (rcu_dereference_protected(gre_proto[version],
- lockdep_is_held(&gre_proto_lock)) != proto)
- goto err_out_unlock;
- RCU_INIT_POINTER(gre_proto[version], NULL);
- spin_unlock(&gre_proto_lock);
- synchronize_rcu();
- return 0;
-
-err_out_unlock:
- spin_unlock(&gre_proto_lock);
-err_out:
- return -1;
-}
-EXPORT_SYMBOL_GPL(gre_del_protocol);
-
-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;
-}
-
-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();
-}
-
-static struct sk_buff *gre_gso_segment(struct sk_buff *skb,
- netdev_features_t features)
-{
- struct sk_buff *segs = ERR_PTR(-EINVAL);
- netdev_features_t enc_features;
- int ghl = GRE_HEADER_SECTION;
- struct gre_base_hdr *greh;
- int mac_len = skb->mac_len;
- __be16 protocol = skb->protocol;
- int tnl_hlen;
- bool csum;
-
- if (unlikely(skb_shinfo(skb)->gso_type &
- ~(SKB_GSO_TCPV4 |
- SKB_GSO_TCPV6 |
- SKB_GSO_UDP |
- SKB_GSO_DODGY |
- SKB_GSO_TCP_ECN |
- SKB_GSO_GRE)))
- goto out;
-
- if (unlikely(!pskb_may_pull(skb, sizeof(*greh))))
- goto out;
-
- greh = (struct gre_base_hdr *)skb_transport_header(skb);
-
- if (greh->flags & GRE_KEY)
- ghl += GRE_HEADER_SECTION;
- if (greh->flags & GRE_SEQ)
- ghl += GRE_HEADER_SECTION;
- if (greh->flags & GRE_CSUM) {
- ghl += GRE_HEADER_SECTION;
- csum = true;
- } else
- csum = false;
-
- /* setup inner skb. */
- skb->protocol = greh->protocol;
- skb->encapsulation = 0;
-
- if (unlikely(!pskb_may_pull(skb, ghl)))
- goto out;
- __skb_pull(skb, ghl);
- skb_reset_mac_header(skb);
- skb_set_network_header(skb, skb_inner_network_offset(skb));
- skb->mac_len = skb_inner_network_offset(skb);
-
- /* segment inner packet. */
- enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
- segs = skb_mac_gso_segment(skb, enc_features);
- if (!segs || IS_ERR(segs))
- goto out;
-
- skb = segs;
- tnl_hlen = skb_tnl_header_len(skb);
- do {
- __skb_push(skb, ghl);
- if (csum) {
- __be32 *pcsum;
-
- if (skb_has_shared_frag(skb)) {
- int err;
-
- err = __skb_linearize(skb);
- if (err) {
- kfree_skb_list(segs);
- segs = ERR_PTR(err);
- goto out;
- }
- }
-
- greh = (struct gre_base_hdr *)(skb->data);
- pcsum = (__be32 *)(greh + 1);
- *pcsum = 0;
- *(__sum16 *)pcsum = csum_fold(skb_checksum(skb, 0, skb->len, 0));
- }
- __skb_push(skb, tnl_hlen - ghl);
-
- skb_reset_mac_header(skb);
- skb_set_network_header(skb, mac_len);
- skb->mac_len = mac_len;
- skb->protocol = protocol;
- } while ((skb = skb->next));
-out:
- return segs;
-}
-
-static int gre_gso_send_check(struct sk_buff *skb)
-{
- if (!skb->encapsulation)
- return -EINVAL;
- return 0;
-}
-
-static const struct net_protocol net_gre_protocol = {
- .handler = gre_rcv,
- .err_handler = gre_err,
- .netns_ok = 1,
-};
-
-static const struct net_offload gre_offload = {
- .callbacks = {
- .gso_send_check = gre_gso_send_check,
- .gso_segment = gre_gso_segment,
- },
-};
-
-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;
- }
-
- if (inet_add_offload(&gre_offload, IPPROTO_GRE)) {
- pr_err("can't add protocol offload\n");
- inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
- return -EAGAIN;
- }
-
- return 0;
-}
-
-static void __exit gre_exit(void)
-{
- inet_del_offload(&gre_offload, IPPROTO_GRE);
- inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
-}
-
-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");
-
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-17 19:13:55 +0300