gre: Remove support for sharing GRE protocol hook.
Support for sharing GREPROTO_CISCO port was added so that OVS gre port and kernel GRE devices can co-exist. After flow-based tunneling patches OVS GRE protocol processing is completely moved to ip_gre module. so there is no need for GRE protocol hook. Following patch consolidates GRE protocol related functions into ip_gre module. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar
David S. Miller
Родитель
b2acd1dc39
Коммит
9f57c67c37
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@ -4,6 +4,12 @@
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#include <linux/skbuff.h>
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#include <net/ip_tunnels.h>
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struct gre_base_hdr {
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__be16 flags;
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__be16 protocol;
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};
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#define GRE_HEADER_SECTION 4
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#define GREPROTO_CISCO 0
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#define GREPROTO_PPTP 1
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#define GREPROTO_MAX 2
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@ -14,83 +20,9 @@ struct gre_protocol {
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void (*err_handler)(struct sk_buff *skb, u32 info);
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};
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struct gre_base_hdr {
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__be16 flags;
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__be16 protocol;
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};
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#define GRE_HEADER_SECTION 4
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int gre_add_protocol(const struct gre_protocol *proto, u8 version);
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int gre_del_protocol(const struct gre_protocol *proto, u8 version);
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struct gre_cisco_protocol {
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int (*handler)(struct sk_buff *skb, const struct tnl_ptk_info *tpi);
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int (*err_handler)(struct sk_buff *skb, u32 info,
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const struct tnl_ptk_info *tpi);
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u8 priority;
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};
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int gre_cisco_register(struct gre_cisco_protocol *proto);
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int gre_cisco_unregister(struct gre_cisco_protocol *proto);
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struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
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u8 name_assign_type);
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static inline int ip_gre_calc_hlen(__be16 o_flags)
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{
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int addend = 4;
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if (o_flags&TUNNEL_CSUM)
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addend += 4;
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if (o_flags&TUNNEL_KEY)
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addend += 4;
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if (o_flags&TUNNEL_SEQ)
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addend += 4;
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return addend;
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}
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static inline __be16 gre_flags_to_tnl_flags(__be16 flags)
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{
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__be16 tflags = 0;
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if (flags & GRE_CSUM)
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tflags |= TUNNEL_CSUM;
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if (flags & GRE_ROUTING)
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tflags |= TUNNEL_ROUTING;
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if (flags & GRE_KEY)
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tflags |= TUNNEL_KEY;
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if (flags & GRE_SEQ)
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tflags |= TUNNEL_SEQ;
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if (flags & GRE_STRICT)
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tflags |= TUNNEL_STRICT;
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if (flags & GRE_REC)
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tflags |= TUNNEL_REC;
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if (flags & GRE_VERSION)
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tflags |= TUNNEL_VERSION;
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return tflags;
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}
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static inline __be16 tnl_flags_to_gre_flags(__be16 tflags)
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{
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__be16 flags = 0;
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if (tflags & TUNNEL_CSUM)
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flags |= GRE_CSUM;
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if (tflags & TUNNEL_ROUTING)
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flags |= GRE_ROUTING;
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if (tflags & TUNNEL_KEY)
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flags |= GRE_KEY;
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if (tflags & TUNNEL_SEQ)
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flags |= GRE_SEQ;
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if (tflags & TUNNEL_STRICT)
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flags |= GRE_STRICT;
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if (tflags & TUNNEL_REC)
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flags |= GRE_REC;
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if (tflags & TUNNEL_VERSION)
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flags |= GRE_VERSION;
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return flags;
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}
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#endif
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@ -31,7 +31,6 @@
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#include <net/xfrm.h>
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static const struct gre_protocol __rcu *gre_proto[GREPROTO_MAX] __read_mostly;
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static struct gre_cisco_protocol __rcu *gre_cisco_proto_list[GRE_IP_PROTO_MAX];
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int gre_add_protocol(const struct gre_protocol *proto, u8 version)
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{
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@ -61,163 +60,6 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version)
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}
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EXPORT_SYMBOL_GPL(gre_del_protocol);
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static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
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bool *csum_err)
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{
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const struct gre_base_hdr *greh;
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__be32 *options;
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int hdr_len;
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if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr))))
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return -EINVAL;
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greh = (struct gre_base_hdr *)skb_transport_header(skb);
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if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
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return -EINVAL;
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tpi->flags = gre_flags_to_tnl_flags(greh->flags);
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hdr_len = ip_gre_calc_hlen(tpi->flags);
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if (!pskb_may_pull(skb, hdr_len))
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return -EINVAL;
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greh = (struct gre_base_hdr *)skb_transport_header(skb);
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tpi->proto = greh->protocol;
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options = (__be32 *)(greh + 1);
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if (greh->flags & GRE_CSUM) {
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if (skb_checksum_simple_validate(skb)) {
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*csum_err = true;
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return -EINVAL;
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}
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skb_checksum_try_convert(skb, IPPROTO_GRE, 0,
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null_compute_pseudo);
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options++;
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}
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if (greh->flags & GRE_KEY) {
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tpi->key = *options;
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options++;
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} else
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tpi->key = 0;
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if (unlikely(greh->flags & GRE_SEQ)) {
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tpi->seq = *options;
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options++;
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} else
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tpi->seq = 0;
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/* WCCP version 1 and 2 protocol decoding.
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* - Change protocol to IP
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* - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
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*/
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if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {
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tpi->proto = htons(ETH_P_IP);
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if ((*(u8 *)options & 0xF0) != 0x40) {
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hdr_len += 4;
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if (!pskb_may_pull(skb, hdr_len))
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return -EINVAL;
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}
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}
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return iptunnel_pull_header(skb, hdr_len, tpi->proto);
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}
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static int gre_cisco_rcv(struct sk_buff *skb)
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{
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struct tnl_ptk_info tpi;
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int i;
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bool csum_err = false;
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#ifdef CONFIG_NET_IPGRE_BROADCAST
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if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
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/* Looped back packet, drop it! */
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if (rt_is_output_route(skb_rtable(skb)))
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goto drop;
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}
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#endif
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if (parse_gre_header(skb, &tpi, &csum_err) < 0)
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goto drop;
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rcu_read_lock();
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for (i = 0; i < GRE_IP_PROTO_MAX; i++) {
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struct gre_cisco_protocol *proto;
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int ret;
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proto = rcu_dereference(gre_cisco_proto_list[i]);
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if (!proto)
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continue;
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ret = proto->handler(skb, &tpi);
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if (ret == PACKET_RCVD) {
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rcu_read_unlock();
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return 0;
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}
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}
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rcu_read_unlock();
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
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drop:
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kfree_skb(skb);
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return 0;
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}
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static void gre_cisco_err(struct sk_buff *skb, u32 info)
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{
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/* All the routers (except for Linux) return only
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* 8 bytes of packet payload. It means, that precise relaying of
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* ICMP in the real Internet is absolutely infeasible.
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*
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* Moreover, Cisco "wise men" put GRE key to the third word
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* in GRE header. It makes impossible maintaining even soft
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* state for keyed
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* GRE tunnels with enabled checksum. Tell them "thank you".
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*
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* Well, I wonder, rfc1812 was written by Cisco employee,
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* what the hell these idiots break standards established
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* by themselves???
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*/
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const int type = icmp_hdr(skb)->type;
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const int code = icmp_hdr(skb)->code;
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struct tnl_ptk_info tpi;
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bool csum_err = false;
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int i;
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if (parse_gre_header(skb, &tpi, &csum_err)) {
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if (!csum_err) /* ignore csum errors. */
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return;
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}
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if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
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ipv4_update_pmtu(skb, dev_net(skb->dev), info,
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skb->dev->ifindex, 0, IPPROTO_GRE, 0);
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return;
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}
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if (type == ICMP_REDIRECT) {
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ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0,
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IPPROTO_GRE, 0);
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return;
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}
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rcu_read_lock();
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for (i = 0; i < GRE_IP_PROTO_MAX; i++) {
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struct gre_cisco_protocol *proto;
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proto = rcu_dereference(gre_cisco_proto_list[i]);
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if (!proto)
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continue;
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if (proto->err_handler(skb, info, &tpi) == PACKET_RCVD)
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goto out;
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}
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out:
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rcu_read_unlock();
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}
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static int gre_rcv(struct sk_buff *skb)
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{
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const struct gre_protocol *proto;
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@ -268,60 +110,19 @@ static const struct net_protocol net_gre_protocol = {
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.netns_ok = 1,
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};
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static const struct gre_protocol ipgre_protocol = {
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.handler = gre_cisco_rcv,
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.err_handler = gre_cisco_err,
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};
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int gre_cisco_register(struct gre_cisco_protocol *newp)
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{
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struct gre_cisco_protocol **proto = (struct gre_cisco_protocol **)
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&gre_cisco_proto_list[newp->priority];
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return (cmpxchg(proto, NULL, newp) == NULL) ? 0 : -EBUSY;
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}
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EXPORT_SYMBOL_GPL(gre_cisco_register);
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int gre_cisco_unregister(struct gre_cisco_protocol *del_proto)
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{
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struct gre_cisco_protocol **proto = (struct gre_cisco_protocol **)
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&gre_cisco_proto_list[del_proto->priority];
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int ret;
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ret = (cmpxchg(proto, del_proto, NULL) == del_proto) ? 0 : -EINVAL;
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if (ret)
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return ret;
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synchronize_net();
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return 0;
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}
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EXPORT_SYMBOL_GPL(gre_cisco_unregister);
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static int __init gre_init(void)
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{
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pr_info("GRE over IPv4 demultiplexor driver\n");
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if (inet_add_protocol(&net_gre_protocol, IPPROTO_GRE) < 0) {
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pr_err("can't add protocol\n");
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goto err;
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return -EAGAIN;
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}
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if (gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0) {
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pr_info("%s: can't add ipgre handler\n", __func__);
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goto err_gre;
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}
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return 0;
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err_gre:
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inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
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err:
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return -EAGAIN;
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}
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static void __exit gre_exit(void)
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{
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gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
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inet_del_protocol(&net_gre_protocol, IPPROTO_GRE);
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}
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@ -123,8 +123,127 @@ static int ipgre_tunnel_init(struct net_device *dev);
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static int ipgre_net_id __read_mostly;
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static int gre_tap_net_id __read_mostly;
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static int ipgre_err(struct sk_buff *skb, u32 info,
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const struct tnl_ptk_info *tpi)
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static int ip_gre_calc_hlen(__be16 o_flags)
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{
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int addend = 4;
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if (o_flags & TUNNEL_CSUM)
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addend += 4;
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if (o_flags & TUNNEL_KEY)
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addend += 4;
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if (o_flags & TUNNEL_SEQ)
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addend += 4;
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return addend;
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}
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static __be16 gre_flags_to_tnl_flags(__be16 flags)
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{
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__be16 tflags = 0;
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if (flags & GRE_CSUM)
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tflags |= TUNNEL_CSUM;
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if (flags & GRE_ROUTING)
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tflags |= TUNNEL_ROUTING;
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if (flags & GRE_KEY)
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tflags |= TUNNEL_KEY;
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if (flags & GRE_SEQ)
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tflags |= TUNNEL_SEQ;
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if (flags & GRE_STRICT)
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tflags |= TUNNEL_STRICT;
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if (flags & GRE_REC)
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tflags |= TUNNEL_REC;
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if (flags & GRE_VERSION)
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tflags |= TUNNEL_VERSION;
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return tflags;
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}
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static __be16 tnl_flags_to_gre_flags(__be16 tflags)
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{
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__be16 flags = 0;
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if (tflags & TUNNEL_CSUM)
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flags |= GRE_CSUM;
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if (tflags & TUNNEL_ROUTING)
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flags |= GRE_ROUTING;
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if (tflags & TUNNEL_KEY)
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flags |= GRE_KEY;
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if (tflags & TUNNEL_SEQ)
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flags |= GRE_SEQ;
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if (tflags & TUNNEL_STRICT)
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flags |= GRE_STRICT;
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if (tflags & TUNNEL_REC)
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flags |= GRE_REC;
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if (tflags & TUNNEL_VERSION)
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flags |= GRE_VERSION;
|
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|
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return flags;
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}
|
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|
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static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
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bool *csum_err)
|
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{
|
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const struct gre_base_hdr *greh;
|
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__be32 *options;
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int hdr_len;
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|
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if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr))))
|
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return -EINVAL;
|
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|
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greh = (struct gre_base_hdr *)skb_transport_header(skb);
|
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if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
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return -EINVAL;
|
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|
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tpi->flags = gre_flags_to_tnl_flags(greh->flags);
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hdr_len = ip_gre_calc_hlen(tpi->flags);
|
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|
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if (!pskb_may_pull(skb, hdr_len))
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return -EINVAL;
|
||||
|
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greh = (struct gre_base_hdr *)skb_transport_header(skb);
|
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tpi->proto = greh->protocol;
|
||||
|
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options = (__be32 *)(greh + 1);
|
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if (greh->flags & GRE_CSUM) {
|
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if (skb_checksum_simple_validate(skb)) {
|
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*csum_err = true;
|
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return -EINVAL;
|
||||
}
|
||||
|
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skb_checksum_try_convert(skb, IPPROTO_GRE, 0,
|
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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 IP
|
||||
* - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
|
||||
*/
|
||||
if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {
|
||||
tpi->proto = htons(ETH_P_IP);
|
||||
if ((*(u8 *)options & 0xF0) != 0x40) {
|
||||
hdr_len += 4;
|
||||
if (!pskb_may_pull(skb, hdr_len))
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
return iptunnel_pull_header(skb, hdr_len, tpi->proto);
|
||||
}
|
||||
|
||||
static void ipgre_err(struct sk_buff *skb, u32 info,
|
||||
const struct tnl_ptk_info *tpi)
|
||||
{
|
||||
|
||||
/* All the routers (except for Linux) return only
|
||||
|
|
@ -150,14 +269,14 @@ static int ipgre_err(struct sk_buff *skb, u32 info,
|
|||
switch (type) {
|
||||
default:
|
||||
case ICMP_PARAMETERPROB:
|
||||
return PACKET_RCVD;
|
||||
return;
|
||||
|
||||
case ICMP_DEST_UNREACH:
|
||||
switch (code) {
|
||||
case ICMP_SR_FAILED:
|
||||
case ICMP_PORT_UNREACH:
|
||||
/* Impossible event. */
|
||||
return PACKET_RCVD;
|
||||
return;
|
||||
default:
|
||||
/* All others are translated to HOST_UNREACH.
|
||||
rfc2003 contains "deep thoughts" about NET_UNREACH,
|
||||
|
|
@ -166,9 +285,10 @@ static int ipgre_err(struct sk_buff *skb, u32 info,
|
|||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
case ICMP_TIME_EXCEEDED:
|
||||
if (code != ICMP_EXC_TTL)
|
||||
return PACKET_RCVD;
|
||||
return;
|
||||
break;
|
||||
|
||||
case ICMP_REDIRECT:
|
||||
|
|
@ -185,21 +305,60 @@ static int ipgre_err(struct sk_buff *skb, u32 info,
|
|||
iph->daddr, iph->saddr, tpi->key);
|
||||
|
||||
if (!t)
|
||||
return PACKET_REJECT;
|
||||
return;
|
||||
|
||||
if (t->parms.iph.daddr == 0 ||
|
||||
ipv4_is_multicast(t->parms.iph.daddr))
|
||||
return PACKET_RCVD;
|
||||
return;
|
||||
|
||||
if (t->parms.iph.ttl == 0 && type == ICMP_TIME_EXCEEDED)
|
||||
return PACKET_RCVD;
|
||||
return;
|
||||
|
||||
if (time_before(jiffies, t->err_time + IPTUNNEL_ERR_TIMEO))
|
||||
t->err_count++;
|
||||
else
|
||||
t->err_count = 1;
|
||||
t->err_time = jiffies;
|
||||
return PACKET_RCVD;
|
||||
}
|
||||
|
||||
static void gre_err(struct sk_buff *skb, u32 info)
|
||||
{
|
||||
/* All the routers (except for Linux) return only
|
||||
* 8 bytes of packet payload. It means, that precise relaying of
|
||||
* ICMP in the real Internet is absolutely infeasible.
|
||||
*
|
||||
* Moreover, Cisco "wise men" put GRE key to the third word
|
||||
* in GRE header. It makes impossible maintaining even soft
|
||||
* state for keyed
|
||||
* GRE tunnels with enabled checksum. Tell them "thank you".
|
||||
*
|
||||
* Well, I wonder, rfc1812 was written by Cisco employee,
|
||||
* what the hell these idiots break standards established
|
||||
* by themselves???
|
||||
*/
|
||||
|
||||
const int type = icmp_hdr(skb)->type;
|
||||
const int code = icmp_hdr(skb)->code;
|
||||
struct tnl_ptk_info tpi;
|
||||
bool csum_err = false;
|
||||
|
||||
if (parse_gre_header(skb, &tpi, &csum_err)) {
|
||||
if (!csum_err) /* ignore csum errors. */
|
||||
return;
|
||||
}
|
||||
|
||||
if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) {
|
||||
ipv4_update_pmtu(skb, dev_net(skb->dev), info,
|
||||
skb->dev->ifindex, 0, IPPROTO_GRE, 0);
|
||||
return;
|
||||
}
|
||||
if (type == ICMP_REDIRECT) {
|
||||
ipv4_redirect(skb, dev_net(skb->dev), skb->dev->ifindex, 0,
|
||||
IPPROTO_GRE, 0);
|
||||
return;
|
||||
}
|
||||
|
||||
ipgre_err(skb, info, &tpi);
|
||||
}
|
||||
|
||||
static __be64 key_to_tunnel_id(__be32 key)
|
||||
|
|
@ -268,6 +427,31 @@ static int ipgre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
|
|||
return PACKET_REJECT;
|
||||
}
|
||||
|
||||
static int gre_rcv(struct sk_buff *skb)
|
||||
{
|
||||
struct tnl_ptk_info tpi;
|
||||
bool csum_err = false;
|
||||
|
||||
#ifdef CONFIG_NET_IPGRE_BROADCAST
|
||||
if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
|
||||
/* Looped back packet, drop it! */
|
||||
if (rt_is_output_route(skb_rtable(skb)))
|
||||
goto drop;
|
||||
}
|
||||
#endif
|
||||
|
||||
if (parse_gre_header(skb, &tpi, &csum_err) < 0)
|
||||
goto drop;
|
||||
|
||||
if (ipgre_rcv(skb, &tpi) == PACKET_RCVD)
|
||||
return 0;
|
||||
|
||||
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
|
||||
drop:
|
||||
kfree_skb(skb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags,
|
||||
__be16 proto, __be32 key, __be32 seq)
|
||||
{
|
||||
|
|
@ -684,10 +868,9 @@ static int ipgre_tunnel_init(struct net_device *dev)
|
|||
return ip_tunnel_init(dev);
|
||||
}
|
||||
|
||||
static struct gre_cisco_protocol ipgre_protocol = {
|
||||
.handler = ipgre_rcv,
|
||||
.err_handler = ipgre_err,
|
||||
.priority = 0,
|
||||
static const struct gre_protocol ipgre_protocol = {
|
||||
.handler = gre_rcv,
|
||||
.err_handler = gre_err,
|
||||
};
|
||||
|
||||
static int __net_init ipgre_init_net(struct net *net)
|
||||
|
|
@ -1080,7 +1263,7 @@ static int __init ipgre_init(void)
|
|||
if (err < 0)
|
||||
goto pnet_tap_faied;
|
||||
|
||||
err = gre_cisco_register(&ipgre_protocol);
|
||||
err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
|
||||
if (err < 0) {
|
||||
pr_info("%s: can't add protocol\n", __func__);
|
||||
goto add_proto_failed;
|
||||
|
|
@ -1099,7 +1282,7 @@ static int __init ipgre_init(void)
|
|||
tap_ops_failed:
|
||||
rtnl_link_unregister(&ipgre_link_ops);
|
||||
rtnl_link_failed:
|
||||
gre_cisco_unregister(&ipgre_protocol);
|
||||
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
|
||||
add_proto_failed:
|
||||
unregister_pernet_device(&ipgre_tap_net_ops);
|
||||
pnet_tap_faied:
|
||||
|
|
@ -1111,7 +1294,7 @@ static void __exit ipgre_fini(void)
|
|||
{
|
||||
rtnl_link_unregister(&ipgre_tap_ops);
|
||||
rtnl_link_unregister(&ipgre_link_ops);
|
||||
gre_cisco_unregister(&ipgre_protocol);
|
||||
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
|
||||
unregister_pernet_device(&ipgre_tap_net_ops);
|
||||
unregister_pernet_device(&ipgre_net_ops);
|
||||
}
|
||||
|
|
|
|||
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