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https://github.com/openvswitch/ovs
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0643a78b74
Most of changes are related to ip-fragment API and genetlink API changes. Signed-off-by: Pravin B Shelar <pshelar@ovn.org> Acked-by: Jesse Gross <jesse@kernel.org>
140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
#ifndef __NET_IP_WRAPPER_H
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#define __NET_IP_WRAPPER_H 1
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#include_next <net/ip.h>
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#include <net/route.h>
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#include <linux/version.h>
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#ifndef HAVE_INET_GET_LOCAL_PORT_RANGE_USING_NET
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static inline void rpl_inet_get_local_port_range(struct net *net, int *low,
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int *high)
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{
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inet_get_local_port_range(low, high);
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}
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#define inet_get_local_port_range rpl_inet_get_local_port_range
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#endif
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#ifndef IPSKB_FRAG_PMTU
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#define IPSKB_FRAG_PMTU BIT(6)
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#endif
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/* IPv4 datagram length is stored into 16bit field (tot_len) */
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#ifndef IP_MAX_MTU
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#define IP_MAX_MTU 0xFFFFU
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#endif
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#ifndef HAVE_IP_SKB_DST_MTU
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static inline bool rpl_ip_sk_use_pmtu(const struct sock *sk)
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{
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return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
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}
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#define ip_sk_use_pmtu rpl_ip_sk_use_pmtu
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static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
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bool forwarding)
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{
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)
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struct net *net = dev_net(dst->dev);
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if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
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dst_metric_locked(dst, RTAX_MTU) ||
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!forwarding)
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return dst_mtu(dst);
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#endif
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return min(dst->dev->mtu, IP_MAX_MTU);
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}
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static inline unsigned int rpl_ip_skb_dst_mtu(const struct sk_buff *skb)
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{
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if (!skb->sk || ip_sk_use_pmtu(skb->sk)) {
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bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
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return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
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} else {
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return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU);
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}
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}
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#define ip_skb_dst_mtu rpl_ip_skb_dst_mtu
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#endif /* HAVE_IP_SKB_DST_MTU */
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#ifdef HAVE_IP_FRAGMENT_TAKES_SOCK
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#ifdef HAVE_IP_LOCAL_OUT_TAKES_NET
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#define OVS_VPORT_OUTPUT_PARAMS struct net *net, struct sock *sock, struct sk_buff *skb
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#else
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#define OVS_VPORT_OUTPUT_PARAMS struct sock *sock, struct sk_buff *skb
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#endif
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#else
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#define OVS_VPORT_OUTPUT_PARAMS struct sk_buff *skb
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#endif
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/* Prior to upstream commit d6b915e29f4a ("ip_fragment: don't forward
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* defragmented DF packet"), IPCB(skb)->frag_max_size was not always populated
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* correctly, which would lead to reassembled packets not being refragmented.
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* So, we backport all of ip_defrag() in these cases.
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*/
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#ifndef HAVE_CORRECT_MRU_HANDLING
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
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static inline bool ip_defrag_user_in_between(u32 user,
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enum ip_defrag_users lower_bond,
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enum ip_defrag_users upper_bond)
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{
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return user >= lower_bond && user <= upper_bond;
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}
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#endif /* < v4.2 */
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int rpl_ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
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int (*output)(OVS_VPORT_OUTPUT_PARAMS));
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#define ip_do_fragment rpl_ip_do_fragment
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/* If backporting IP defrag, then init/exit functions need to be called from
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* compat_{in,ex}it() to prepare the backported fragmentation cache. In this
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* case we declare the functions which are defined in
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* datapath/linux/compat/ip_fragment.c. */
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int rpl_ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
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#define ip_defrag rpl_ip_defrag
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int __init rpl_ipfrag_init(void);
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void rpl_ipfrag_fini(void);
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#else /* HAVE_CORRECT_MRU_HANDLING */
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#ifndef HAVE_IP_DO_FRAGMENT_TAKES_NET
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static inline int rpl_ip_do_fragment(struct net *net, struct sock *sk,
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struct sk_buff *skb,
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int (*output)(OVS_VPORT_OUTPUT_PARAMS))
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{
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return ip_do_fragment(sk, skb, output);
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}
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#define ip_do_fragment rpl_ip_do_fragment
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#endif /* IP_DO_FRAGMENT_TAKES_NET */
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/* We have no good way to detect the presence of upstream commit 8282f27449bf
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* ("inet: frag: Always orphan skbs inside ip_defrag()"), but it should be
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* always included in kernels 4.5+. */
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#if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
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static inline int rpl_ip_defrag(struct net *net, struct sk_buff *skb, u32 user)
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{
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skb_orphan(skb);
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#ifndef HAVE_IP_DEFRAG_TAKES_NET
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return ip_defrag(skb, user);
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#else
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return ip_defrag(net, skb, user);
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#endif
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}
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#define ip_defrag rpl_ip_defrag
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#endif
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/* If we can use upstream defrag then we can rely on the upstream
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* defrag module to init/exit correctly. In this case the calls in
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* compat_{in,ex}it() can be no-ops. */
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static inline int rpl_ipfrag_init(void) { return 0; }
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static inline void rpl_ipfrag_fini(void) { }
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#endif /* HAVE_CORRECT_MRU_HANDLING */
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#define ipfrag_init rpl_ipfrag_init
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#define ipfrag_fini rpl_ipfrag_fini
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#endif
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