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7458575a07
The NEXT-C-SID mechanism described in [1] offers the possibility of encoding several SRv6 segments within a single 128 bit SID address. Such a SID address is called a Compressed SID (C-SID) container. In this way, the length of the SID List can be drastically reduced. A SID instantiated with the NEXT-C-SID flavor considers an IPv6 address logically structured in three main blocks: i) Locator-Block; ii) Locator-Node Function; iii) Argument. C-SID container +------------------------------------------------------------------+ | Locator-Block |Loc-Node| Argument | | |Function| | +------------------------------------------------------------------+ <--------- B -----------> <- NF -> <------------- A ---------------> (i) The Locator-Block can be any IPv6 prefix available to the provider; (ii) The Locator-Node Function represents the node and the function to be triggered when a packet is received on the node; (iii) The Argument carries the remaining C-SIDs in the current C-SID container. This patch leverages the NEXT-C-SID mechanism previously introduced in the Linux SRv6 subsystem [2] to support SID compression capabilities in the SRv6 End.X behavior [3]. An SRv6 End.X behavior with NEXT-C-SID flavor works as an End.X behavior but it is capable of processing the compressed SID List encoded in C-SID containers. An SRv6 End.X behavior with NEXT-C-SID flavor can be configured to support user-provided Locator-Block and Locator-Node Function lengths. In this implementation, such lengths must be evenly divisible by 8 (i.e. must be byte-aligned), otherwise the kernel informs the user about invalid values with a meaningful error code and message through netlink_ext_ack. If Locator-Block and/or Locator-Node Function lengths are not provided by the user during configuration of an SRv6 End.X behavior instance with NEXT-C-SID flavor, the kernel will choose their default values i.e., 32-bit Locator-Block and 16-bit Locator-Node Function. [1] - https://datatracker.ietf.org/doc/html/draft-ietf-spring-srv6-srh-compression [2] - https://lore.kernel.org/all/20220912171619.16943-1-andrea.mayer@uniroma2.it/ [3] - https://datatracker.ietf.org/doc/html/rfc8986#name-endx-l3-cross-connect Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it> Reviewed-by: Hangbin Liu <liuhangbin@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20230812180926.16689-2-andrea.mayer@uniroma2.it Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2713 lines
68 KiB
C
2713 lines
68 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* SR-IPv6 implementation
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*
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* Authors:
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* David Lebrun <david.lebrun@uclouvain.be>
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* eBPF support: Mathieu Xhonneux <m.xhonneux@gmail.com>
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*/
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#include <linux/filter.h>
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/net.h>
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#include <linux/module.h>
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#include <net/ip.h>
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#include <net/lwtunnel.h>
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#include <net/netevent.h>
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#include <net/netns/generic.h>
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#include <net/ip6_fib.h>
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#include <net/route.h>
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#include <net/seg6.h>
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#include <linux/seg6.h>
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#include <linux/seg6_local.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#include <net/dst_cache.h>
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#include <net/ip_tunnels.h>
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#ifdef CONFIG_IPV6_SEG6_HMAC
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#include <net/seg6_hmac.h>
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#endif
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#include <net/seg6_local.h>
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#include <linux/etherdevice.h>
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#include <linux/bpf.h>
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#include <linux/netfilter.h>
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#define SEG6_F_ATTR(i) BIT(i)
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struct seg6_local_lwt;
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/* callbacks used for customizing the creation and destruction of a behavior */
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struct seg6_local_lwtunnel_ops {
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int (*build_state)(struct seg6_local_lwt *slwt, const void *cfg,
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struct netlink_ext_ack *extack);
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void (*destroy_state)(struct seg6_local_lwt *slwt);
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};
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struct seg6_action_desc {
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int action;
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unsigned long attrs;
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/* The optattrs field is used for specifying all the optional
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* attributes supported by a specific behavior.
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* It means that if one of these attributes is not provided in the
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* netlink message during the behavior creation, no errors will be
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* returned to the userspace.
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*
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* Each attribute can be only of two types (mutually exclusive):
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* 1) required or 2) optional.
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* Every user MUST obey to this rule! If you set an attribute as
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* required the same attribute CANNOT be set as optional and vice
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* versa.
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*/
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unsigned long optattrs;
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int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
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int static_headroom;
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struct seg6_local_lwtunnel_ops slwt_ops;
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};
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struct bpf_lwt_prog {
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struct bpf_prog *prog;
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char *name;
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};
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/* default length values (expressed in bits) for both Locator-Block and
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* Locator-Node Function.
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*
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* Both SEG6_LOCAL_LCBLOCK_DBITS and SEG6_LOCAL_LCNODE_FN_DBITS *must* be:
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* i) greater than 0;
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* ii) evenly divisible by 8. In other terms, the lengths of the
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* Locator-Block and Locator-Node Function must be byte-aligned (we can
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* relax this constraint in the future if really needed).
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*
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* Moreover, a third condition must hold:
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* iii) SEG6_LOCAL_LCBLOCK_DBITS + SEG6_LOCAL_LCNODE_FN_DBITS <= 128.
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*
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* The correctness of SEG6_LOCAL_LCBLOCK_DBITS and SEG6_LOCAL_LCNODE_FN_DBITS
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* values are checked during the kernel compilation. If the compilation stops,
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* check the value of these parameters to see if they meet conditions (i), (ii)
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* and (iii).
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*/
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#define SEG6_LOCAL_LCBLOCK_DBITS 32
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#define SEG6_LOCAL_LCNODE_FN_DBITS 16
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/* The following next_csid_chk_{cntr,lcblock,lcblock_fn}_bits macros can be
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* used directly to check whether the lengths (in bits) of Locator-Block and
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* Locator-Node Function are valid according to (i), (ii), (iii).
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*/
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#define next_csid_chk_cntr_bits(blen, flen) \
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((blen) + (flen) > 128)
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#define next_csid_chk_lcblock_bits(blen) \
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({ \
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typeof(blen) __tmp = blen; \
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(!__tmp || __tmp > 120 || (__tmp & 0x07)); \
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})
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#define next_csid_chk_lcnode_fn_bits(flen) \
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next_csid_chk_lcblock_bits(flen)
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/* flag indicating that flavors are set up for a given End* behavior */
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#define SEG6_F_LOCAL_FLAVORS SEG6_F_ATTR(SEG6_LOCAL_FLAVORS)
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#define SEG6_F_LOCAL_FLV_OP(flvname) BIT(SEG6_LOCAL_FLV_OP_##flvname)
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#define SEG6_F_LOCAL_FLV_NEXT_CSID SEG6_F_LOCAL_FLV_OP(NEXT_CSID)
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#define SEG6_F_LOCAL_FLV_PSP SEG6_F_LOCAL_FLV_OP(PSP)
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/* Supported RFC8986 Flavor operations are reported in this bitmask */
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#define SEG6_LOCAL_FLV8986_SUPP_OPS SEG6_F_LOCAL_FLV_PSP
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#define SEG6_LOCAL_END_FLV_SUPP_OPS (SEG6_F_LOCAL_FLV_NEXT_CSID | \
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SEG6_LOCAL_FLV8986_SUPP_OPS)
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#define SEG6_LOCAL_END_X_FLV_SUPP_OPS SEG6_F_LOCAL_FLV_NEXT_CSID
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struct seg6_flavors_info {
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/* Flavor operations */
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__u32 flv_ops;
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/* Locator-Block length, expressed in bits */
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__u8 lcblock_bits;
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/* Locator-Node Function length, expressed in bits*/
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__u8 lcnode_func_bits;
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};
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enum seg6_end_dt_mode {
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DT_INVALID_MODE = -EINVAL,
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DT_LEGACY_MODE = 0,
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DT_VRF_MODE = 1,
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};
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struct seg6_end_dt_info {
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enum seg6_end_dt_mode mode;
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struct net *net;
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/* VRF device associated to the routing table used by the SRv6
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* End.DT4/DT6 behavior for routing IPv4/IPv6 packets.
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*/
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int vrf_ifindex;
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int vrf_table;
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/* tunneled packet family (IPv4 or IPv6).
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* Protocol and header length are inferred from family.
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*/
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u16 family;
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};
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struct pcpu_seg6_local_counters {
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u64_stats_t packets;
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u64_stats_t bytes;
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u64_stats_t errors;
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struct u64_stats_sync syncp;
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};
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/* This struct groups all the SRv6 Behavior counters supported so far.
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*
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* put_nla_counters() makes use of this data structure to collect all counter
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* values after the per-CPU counter evaluation has been performed.
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* Finally, each counter value (in seg6_local_counters) is stored in the
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* corresponding netlink attribute and sent to user space.
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*
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* NB: we don't want to expose this structure to user space!
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*/
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struct seg6_local_counters {
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__u64 packets;
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__u64 bytes;
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__u64 errors;
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};
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#define seg6_local_alloc_pcpu_counters(__gfp) \
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__netdev_alloc_pcpu_stats(struct pcpu_seg6_local_counters, \
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((__gfp) | __GFP_ZERO))
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#define SEG6_F_LOCAL_COUNTERS SEG6_F_ATTR(SEG6_LOCAL_COUNTERS)
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struct seg6_local_lwt {
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int action;
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struct ipv6_sr_hdr *srh;
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int table;
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struct in_addr nh4;
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struct in6_addr nh6;
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int iif;
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int oif;
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struct bpf_lwt_prog bpf;
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#ifdef CONFIG_NET_L3_MASTER_DEV
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struct seg6_end_dt_info dt_info;
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#endif
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struct seg6_flavors_info flv_info;
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struct pcpu_seg6_local_counters __percpu *pcpu_counters;
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int headroom;
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struct seg6_action_desc *desc;
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/* unlike the required attrs, we have to track the optional attributes
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* that have been effectively parsed.
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*/
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unsigned long parsed_optattrs;
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};
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static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
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{
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return (struct seg6_local_lwt *)lwt->data;
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}
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static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb)
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{
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struct ipv6_sr_hdr *srh;
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srh = seg6_get_srh(skb, IP6_FH_F_SKIP_RH);
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if (!srh)
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return NULL;
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#ifdef CONFIG_IPV6_SEG6_HMAC
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if (!seg6_hmac_validate_skb(skb))
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return NULL;
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#endif
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return srh;
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}
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static bool decap_and_validate(struct sk_buff *skb, int proto)
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{
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struct ipv6_sr_hdr *srh;
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unsigned int off = 0;
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srh = seg6_get_srh(skb, 0);
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if (srh && srh->segments_left > 0)
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return false;
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#ifdef CONFIG_IPV6_SEG6_HMAC
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if (srh && !seg6_hmac_validate_skb(skb))
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return false;
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#endif
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if (ipv6_find_hdr(skb, &off, proto, NULL, NULL) < 0)
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return false;
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if (!pskb_pull(skb, off))
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return false;
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skb_postpull_rcsum(skb, skb_network_header(skb), off);
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skb_reset_network_header(skb);
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skb_reset_transport_header(skb);
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if (iptunnel_pull_offloads(skb))
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return false;
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return true;
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}
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static void advance_nextseg(struct ipv6_sr_hdr *srh, struct in6_addr *daddr)
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{
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struct in6_addr *addr;
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srh->segments_left--;
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addr = srh->segments + srh->segments_left;
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*daddr = *addr;
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}
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static int
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seg6_lookup_any_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
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u32 tbl_id, bool local_delivery)
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{
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struct net *net = dev_net(skb->dev);
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struct ipv6hdr *hdr = ipv6_hdr(skb);
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int flags = RT6_LOOKUP_F_HAS_SADDR;
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struct dst_entry *dst = NULL;
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struct rt6_info *rt;
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struct flowi6 fl6;
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int dev_flags = 0;
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_iif = skb->dev->ifindex;
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fl6.daddr = nhaddr ? *nhaddr : hdr->daddr;
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fl6.saddr = hdr->saddr;
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fl6.flowlabel = ip6_flowinfo(hdr);
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fl6.flowi6_mark = skb->mark;
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fl6.flowi6_proto = hdr->nexthdr;
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if (nhaddr)
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fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH;
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if (!tbl_id) {
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dst = ip6_route_input_lookup(net, skb->dev, &fl6, skb, flags);
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} else {
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struct fib6_table *table;
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table = fib6_get_table(net, tbl_id);
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if (!table)
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goto out;
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rt = ip6_pol_route(net, table, 0, &fl6, skb, flags);
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dst = &rt->dst;
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}
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/* we want to discard traffic destined for local packet processing,
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* if @local_delivery is set to false.
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*/
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if (!local_delivery)
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dev_flags |= IFF_LOOPBACK;
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if (dst && (dst->dev->flags & dev_flags) && !dst->error) {
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dst_release(dst);
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dst = NULL;
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}
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out:
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if (!dst) {
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rt = net->ipv6.ip6_blk_hole_entry;
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dst = &rt->dst;
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dst_hold(dst);
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}
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skb_dst_drop(skb);
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skb_dst_set(skb, dst);
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return dst->error;
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}
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int seg6_lookup_nexthop(struct sk_buff *skb,
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struct in6_addr *nhaddr, u32 tbl_id)
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{
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return seg6_lookup_any_nexthop(skb, nhaddr, tbl_id, false);
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}
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static __u8 seg6_flv_lcblock_octects(const struct seg6_flavors_info *finfo)
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{
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return finfo->lcblock_bits >> 3;
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}
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static __u8 seg6_flv_lcnode_func_octects(const struct seg6_flavors_info *finfo)
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{
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return finfo->lcnode_func_bits >> 3;
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}
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static bool seg6_next_csid_is_arg_zero(const struct in6_addr *addr,
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const struct seg6_flavors_info *finfo)
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{
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__u8 fnc_octects = seg6_flv_lcnode_func_octects(finfo);
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__u8 blk_octects = seg6_flv_lcblock_octects(finfo);
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__u8 arg_octects;
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int i;
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arg_octects = 16 - blk_octects - fnc_octects;
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for (i = 0; i < arg_octects; ++i) {
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if (addr->s6_addr[blk_octects + fnc_octects + i] != 0x00)
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return false;
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}
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return true;
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}
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/* assume that DA.Argument length > 0 */
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static void seg6_next_csid_advance_arg(struct in6_addr *addr,
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const struct seg6_flavors_info *finfo)
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{
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__u8 fnc_octects = seg6_flv_lcnode_func_octects(finfo);
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__u8 blk_octects = seg6_flv_lcblock_octects(finfo);
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/* advance DA.Argument */
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memmove(&addr->s6_addr[blk_octects],
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&addr->s6_addr[blk_octects + fnc_octects],
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16 - blk_octects - fnc_octects);
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memset(&addr->s6_addr[16 - fnc_octects], 0x00, fnc_octects);
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}
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static int input_action_end_finish(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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seg6_lookup_nexthop(skb, NULL, 0);
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return dst_input(skb);
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}
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static int input_action_end_core(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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struct ipv6_sr_hdr *srh;
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srh = get_and_validate_srh(skb);
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if (!srh)
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goto drop;
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advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
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return input_action_end_finish(skb, slwt);
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drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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static int end_next_csid_core(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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const struct seg6_flavors_info *finfo = &slwt->flv_info;
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struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
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if (seg6_next_csid_is_arg_zero(daddr, finfo))
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return input_action_end_core(skb, slwt);
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/* update DA */
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seg6_next_csid_advance_arg(daddr, finfo);
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return input_action_end_finish(skb, slwt);
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}
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static int input_action_end_x_finish(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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seg6_lookup_nexthop(skb, &slwt->nh6, 0);
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return dst_input(skb);
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}
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|
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static int input_action_end_x_core(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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{
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struct ipv6_sr_hdr *srh;
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srh = get_and_validate_srh(skb);
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if (!srh)
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goto drop;
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advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
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|
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return input_action_end_x_finish(skb, slwt);
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|
|
drop:
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kfree_skb(skb);
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return -EINVAL;
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}
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|
|
|
static int end_x_next_csid_core(struct sk_buff *skb,
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struct seg6_local_lwt *slwt)
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|
{
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const struct seg6_flavors_info *finfo = &slwt->flv_info;
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|
struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
|
|
|
|
if (seg6_next_csid_is_arg_zero(daddr, finfo))
|
|
return input_action_end_x_core(skb, slwt);
|
|
|
|
/* update DA */
|
|
seg6_next_csid_advance_arg(daddr, finfo);
|
|
|
|
return input_action_end_x_finish(skb, slwt);
|
|
}
|
|
|
|
static bool seg6_next_csid_enabled(__u32 fops)
|
|
{
|
|
return fops & SEG6_F_LOCAL_FLV_NEXT_CSID;
|
|
}
|
|
|
|
/* Processing of SRv6 End, End.X, and End.T behaviors can be extended through
|
|
* the flavors framework. These behaviors must report the subset of (flavor)
|
|
* operations they currently implement. In this way, if a user specifies a
|
|
* flavor combination that is not supported by a given End* behavior, the
|
|
* kernel refuses to instantiate the tunnel reporting the error.
|
|
*/
|
|
static int seg6_flv_supp_ops_by_action(int action, __u32 *fops)
|
|
{
|
|
switch (action) {
|
|
case SEG6_LOCAL_ACTION_END:
|
|
*fops = SEG6_LOCAL_END_FLV_SUPP_OPS;
|
|
break;
|
|
case SEG6_LOCAL_ACTION_END_X:
|
|
*fops = SEG6_LOCAL_END_X_FLV_SUPP_OPS;
|
|
break;
|
|
default:
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* We describe the packet state in relation to the absence/presence of the SRH
|
|
* and the Segment Left (SL) field.
|
|
* For our purposes, it is not necessary to record the exact value of the SL
|
|
* when the SID List consists of two or more segments.
|
|
*/
|
|
enum seg6_local_pktinfo {
|
|
/* the order really matters! */
|
|
SEG6_LOCAL_PKTINFO_NOHDR = 0,
|
|
SEG6_LOCAL_PKTINFO_SL_ZERO,
|
|
SEG6_LOCAL_PKTINFO_SL_ONE,
|
|
SEG6_LOCAL_PKTINFO_SL_MORE,
|
|
__SEG6_LOCAL_PKTINFO_MAX,
|
|
};
|
|
|
|
#define SEG6_LOCAL_PKTINFO_MAX (__SEG6_LOCAL_PKTINFO_MAX - 1)
|
|
|
|
static enum seg6_local_pktinfo seg6_get_srh_pktinfo(struct ipv6_sr_hdr *srh)
|
|
{
|
|
__u8 sgl;
|
|
|
|
if (!srh)
|
|
return SEG6_LOCAL_PKTINFO_NOHDR;
|
|
|
|
sgl = srh->segments_left;
|
|
if (sgl < 2)
|
|
return SEG6_LOCAL_PKTINFO_SL_ZERO + sgl;
|
|
|
|
return SEG6_LOCAL_PKTINFO_SL_MORE;
|
|
}
|
|
|
|
enum seg6_local_flv_action {
|
|
SEG6_LOCAL_FLV_ACT_UNSPEC = 0,
|
|
SEG6_LOCAL_FLV_ACT_END,
|
|
SEG6_LOCAL_FLV_ACT_PSP,
|
|
SEG6_LOCAL_FLV_ACT_USP,
|
|
SEG6_LOCAL_FLV_ACT_USD,
|
|
__SEG6_LOCAL_FLV_ACT_MAX
|
|
};
|
|
|
|
#define SEG6_LOCAL_FLV_ACT_MAX (__SEG6_LOCAL_FLV_ACT_MAX - 1)
|
|
|
|
/* The action table for RFC8986 flavors (see the flv8986_act_tbl below)
|
|
* contains the actions (i.e. processing operations) to be applied on packets
|
|
* when flavors are configured for an End* behavior.
|
|
* By combining the pkinfo data and from the flavors mask, the macro
|
|
* computes the index used to access the elements (actions) stored in the
|
|
* action table. The index is structured as follows:
|
|
*
|
|
* index
|
|
* _______________/\________________
|
|
* / \
|
|
* +----------------+----------------+
|
|
* | pf | afm |
|
|
* +----------------+----------------+
|
|
* ph-1 ... p1 p0 fk-1 ... f1 f0
|
|
* MSB LSB
|
|
*
|
|
* where:
|
|
* - 'afm' (adjusted flavor mask) is the mask containing a combination of the
|
|
* RFC8986 flavors currently supported. 'afm' corresponds to the @fm
|
|
* argument of the macro whose value is righ-shifted by 1 bit. By doing so,
|
|
* we discard the SEG6_LOCAL_FLV_OP_UNSPEC flag (bit 0 in @fm) which is
|
|
* never used here;
|
|
* - 'pf' encodes the packet info (pktinfo) regarding the presence/absence of
|
|
* the SRH, SL = 0, etc. 'pf' is set with the value of @pf provided as
|
|
* argument to the macro.
|
|
*/
|
|
#define flv8986_act_tbl_idx(pf, fm) \
|
|
((((pf) << bits_per(SEG6_LOCAL_FLV8986_SUPP_OPS)) | \
|
|
((fm) & SEG6_LOCAL_FLV8986_SUPP_OPS)) >> SEG6_LOCAL_FLV_OP_PSP)
|
|
|
|
/* We compute the size of the action table by considering the RFC8986 flavors
|
|
* actually supported by the kernel. In this way, the size is automatically
|
|
* adjusted when new flavors are supported.
|
|
*/
|
|
#define FLV8986_ACT_TBL_SIZE \
|
|
roundup_pow_of_two(flv8986_act_tbl_idx(SEG6_LOCAL_PKTINFO_MAX, \
|
|
SEG6_LOCAL_FLV8986_SUPP_OPS))
|
|
|
|
/* tbl_cfg(act, pf, fm) macro is used to easily configure the action
|
|
* table; it accepts 3 arguments:
|
|
* i) @act, the suffix from SEG6_LOCAL_FLV_ACT_{act} representing
|
|
* the action that should be applied on the packet;
|
|
* ii) @pf, the suffix from SEG6_LOCAL_PKTINFO_{pf} reporting the packet
|
|
* info about the lack/presence of SRH, SRH with SL = 0, etc;
|
|
* iii) @fm, the mask of flavors.
|
|
*/
|
|
#define tbl_cfg(act, pf, fm) \
|
|
[flv8986_act_tbl_idx(SEG6_LOCAL_PKTINFO_##pf, \
|
|
(fm))] = SEG6_LOCAL_FLV_ACT_##act
|
|
|
|
/* shorthand for improving readability */
|
|
#define F_PSP SEG6_F_LOCAL_FLV_PSP
|
|
|
|
/* The table contains, for each combination of the pktinfo data and
|
|
* flavors, the action that should be taken on a packet (e.g.
|
|
* "standard" Endpoint processing, Penultimate Segment Pop, etc).
|
|
*
|
|
* By default, table entries not explicitly configured are initialized with the
|
|
* SEG6_LOCAL_FLV_ACT_UNSPEC action, which generally has the effect of
|
|
* discarding the processed packet.
|
|
*/
|
|
static const u8 flv8986_act_tbl[FLV8986_ACT_TBL_SIZE] = {
|
|
/* PSP variant for packet where SRH with SL = 1 */
|
|
tbl_cfg(PSP, SL_ONE, F_PSP),
|
|
/* End for packet where the SRH with SL > 1*/
|
|
tbl_cfg(END, SL_MORE, F_PSP),
|
|
};
|
|
|
|
#undef F_PSP
|
|
#undef tbl_cfg
|
|
|
|
/* For each flavor defined in RFC8986 (or a combination of them) an action is
|
|
* performed on the packet. The specific action depends on:
|
|
* - info extracted from the packet (i.e. pktinfo data) regarding the
|
|
* lack/presence of the SRH, and if the SRH is available, on the value of
|
|
* Segment Left field;
|
|
* - the mask of flavors configured for the specific SRv6 End* behavior.
|
|
*
|
|
* The function combines both the pkinfo and the flavors mask to evaluate the
|
|
* corresponding action to be taken on the packet.
|
|
*/
|
|
static enum seg6_local_flv_action
|
|
seg6_local_flv8986_act_lookup(enum seg6_local_pktinfo pinfo, __u32 flvmask)
|
|
{
|
|
unsigned long index;
|
|
|
|
/* check if the provided mask of flavors is supported */
|
|
if (unlikely(flvmask & ~SEG6_LOCAL_FLV8986_SUPP_OPS))
|
|
return SEG6_LOCAL_FLV_ACT_UNSPEC;
|
|
|
|
index = flv8986_act_tbl_idx(pinfo, flvmask);
|
|
if (unlikely(index >= FLV8986_ACT_TBL_SIZE))
|
|
return SEG6_LOCAL_FLV_ACT_UNSPEC;
|
|
|
|
return flv8986_act_tbl[index];
|
|
}
|
|
|
|
/* skb->data must be aligned with skb->network_header */
|
|
static bool seg6_pop_srh(struct sk_buff *skb, int srhoff)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
struct ipv6hdr *iph;
|
|
__u8 srh_nexthdr;
|
|
int thoff = -1;
|
|
int srhlen;
|
|
int nhlen;
|
|
|
|
if (unlikely(srhoff < sizeof(*iph) ||
|
|
!pskb_may_pull(skb, srhoff + sizeof(*srh))))
|
|
return false;
|
|
|
|
srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
|
|
srhlen = ipv6_optlen(srh);
|
|
|
|
/* we are about to mangle the pkt, let's check if we can write on it */
|
|
if (unlikely(skb_ensure_writable(skb, srhoff + srhlen)))
|
|
return false;
|
|
|
|
/* skb_ensure_writable() may change skb pointers; evaluate srh again */
|
|
srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
|
|
srh_nexthdr = srh->nexthdr;
|
|
|
|
if (unlikely(!skb_transport_header_was_set(skb)))
|
|
goto pull;
|
|
|
|
nhlen = skb_network_header_len(skb);
|
|
/* we have to deal with the transport header: it could be set before
|
|
* the SRH, after the SRH, or within it (which is considered wrong,
|
|
* however).
|
|
*/
|
|
if (likely(nhlen <= srhoff))
|
|
thoff = nhlen;
|
|
else if (nhlen >= srhoff + srhlen)
|
|
/* transport_header is set after the SRH */
|
|
thoff = nhlen - srhlen;
|
|
else
|
|
/* transport_header falls inside the SRH; hence, we can't
|
|
* restore the transport_header pointer properly after
|
|
* SRH removing operation.
|
|
*/
|
|
return false;
|
|
pull:
|
|
/* we need to pop the SRH:
|
|
* 1) first of all, we pull out everything from IPv6 header up to SRH
|
|
* (included) evaluating also the rcsum;
|
|
* 2) we overwrite (and then remove) the SRH by properly moving the
|
|
* IPv6 along with any extension header that precedes the SRH;
|
|
* 3) At the end, we push back the pulled headers (except for SRH,
|
|
* obviously).
|
|
*/
|
|
skb_pull_rcsum(skb, srhoff + srhlen);
|
|
memmove(skb_network_header(skb) + srhlen, skb_network_header(skb),
|
|
srhoff);
|
|
skb_push(skb, srhoff);
|
|
|
|
skb_reset_network_header(skb);
|
|
skb_mac_header_rebuild(skb);
|
|
if (likely(thoff >= 0))
|
|
skb_set_transport_header(skb, thoff);
|
|
|
|
iph = ipv6_hdr(skb);
|
|
if (iph->nexthdr == NEXTHDR_ROUTING) {
|
|
iph->nexthdr = srh_nexthdr;
|
|
} else {
|
|
/* we must look for the extension header (EXTH, for short) that
|
|
* immediately precedes the SRH we have just removed.
|
|
* Then, we update the value of the EXTH nexthdr with the one
|
|
* contained in the SRH nexthdr.
|
|
*/
|
|
unsigned int off = sizeof(*iph);
|
|
struct ipv6_opt_hdr *hp, _hdr;
|
|
__u8 nexthdr = iph->nexthdr;
|
|
|
|
for (;;) {
|
|
if (unlikely(!ipv6_ext_hdr(nexthdr) ||
|
|
nexthdr == NEXTHDR_NONE))
|
|
return false;
|
|
|
|
hp = skb_header_pointer(skb, off, sizeof(_hdr), &_hdr);
|
|
if (unlikely(!hp))
|
|
return false;
|
|
|
|
if (hp->nexthdr == NEXTHDR_ROUTING) {
|
|
hp->nexthdr = srh_nexthdr;
|
|
break;
|
|
}
|
|
|
|
switch (nexthdr) {
|
|
case NEXTHDR_FRAGMENT:
|
|
fallthrough;
|
|
case NEXTHDR_AUTH:
|
|
/* we expect SRH before FRAG and AUTH */
|
|
return false;
|
|
default:
|
|
off += ipv6_optlen(hp);
|
|
break;
|
|
}
|
|
|
|
nexthdr = hp->nexthdr;
|
|
}
|
|
}
|
|
|
|
iph->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
|
|
|
|
skb_postpush_rcsum(skb, iph, srhoff);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* process the packet on the basis of the RFC8986 flavors set for the given
|
|
* SRv6 End behavior instance.
|
|
*/
|
|
static int end_flv8986_core(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
const struct seg6_flavors_info *finfo = &slwt->flv_info;
|
|
enum seg6_local_flv_action action;
|
|
enum seg6_local_pktinfo pinfo;
|
|
struct ipv6_sr_hdr *srh;
|
|
__u32 flvmask;
|
|
int srhoff;
|
|
|
|
srh = seg6_get_srh(skb, 0);
|
|
srhoff = srh ? ((unsigned char *)srh - skb->data) : 0;
|
|
pinfo = seg6_get_srh_pktinfo(srh);
|
|
#ifdef CONFIG_IPV6_SEG6_HMAC
|
|
if (srh && !seg6_hmac_validate_skb(skb))
|
|
goto drop;
|
|
#endif
|
|
flvmask = finfo->flv_ops;
|
|
if (unlikely(flvmask & ~SEG6_LOCAL_FLV8986_SUPP_OPS)) {
|
|
pr_warn_once("seg6local: invalid RFC8986 flavors\n");
|
|
goto drop;
|
|
}
|
|
|
|
/* retrieve the action triggered by the combination of pktinfo data and
|
|
* the flavors mask.
|
|
*/
|
|
action = seg6_local_flv8986_act_lookup(pinfo, flvmask);
|
|
switch (action) {
|
|
case SEG6_LOCAL_FLV_ACT_END:
|
|
/* process the packet as the "standard" End behavior */
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
break;
|
|
case SEG6_LOCAL_FLV_ACT_PSP:
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
if (unlikely(!seg6_pop_srh(skb, srhoff)))
|
|
goto drop;
|
|
break;
|
|
case SEG6_LOCAL_FLV_ACT_UNSPEC:
|
|
fallthrough;
|
|
default:
|
|
/* by default, we drop the packet since we could not find a
|
|
* suitable action.
|
|
*/
|
|
goto drop;
|
|
}
|
|
|
|
return input_action_end_finish(skb, slwt);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* regular endpoint function */
|
|
static int input_action_end(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
const struct seg6_flavors_info *finfo = &slwt->flv_info;
|
|
__u32 fops = finfo->flv_ops;
|
|
|
|
if (!fops)
|
|
return input_action_end_core(skb, slwt);
|
|
|
|
/* check for the presence of NEXT-C-SID since it applies first */
|
|
if (seg6_next_csid_enabled(fops))
|
|
return end_next_csid_core(skb, slwt);
|
|
|
|
/* the specific processing function to be performed on the packet
|
|
* depends on the combination of flavors defined in RFC8986 and some
|
|
* information extracted from the packet, e.g. presence/absence of SRH,
|
|
* Segment Left = 0, etc.
|
|
*/
|
|
return end_flv8986_core(skb, slwt);
|
|
}
|
|
|
|
/* regular endpoint, and forward to specified nexthop */
|
|
static int input_action_end_x(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
const struct seg6_flavors_info *finfo = &slwt->flv_info;
|
|
__u32 fops = finfo->flv_ops;
|
|
|
|
/* check for the presence of NEXT-C-SID since it applies first */
|
|
if (seg6_next_csid_enabled(fops))
|
|
return end_x_next_csid_core(skb, slwt);
|
|
|
|
return input_action_end_x_core(skb, slwt);
|
|
}
|
|
|
|
static int input_action_end_t(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
seg6_lookup_nexthop(skb, NULL, slwt->table);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* decapsulate and forward inner L2 frame on specified interface */
|
|
static int input_action_end_dx2(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct net_device *odev;
|
|
struct ethhdr *eth;
|
|
|
|
if (!decap_and_validate(skb, IPPROTO_ETHERNET))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, ETH_HLEN))
|
|
goto drop;
|
|
|
|
skb_reset_mac_header(skb);
|
|
eth = (struct ethhdr *)skb->data;
|
|
|
|
/* To determine the frame's protocol, we assume it is 802.3. This avoids
|
|
* a call to eth_type_trans(), which is not really relevant for our
|
|
* use case.
|
|
*/
|
|
if (!eth_proto_is_802_3(eth->h_proto))
|
|
goto drop;
|
|
|
|
odev = dev_get_by_index_rcu(net, slwt->oif);
|
|
if (!odev)
|
|
goto drop;
|
|
|
|
/* As we accept Ethernet frames, make sure the egress device is of
|
|
* the correct type.
|
|
*/
|
|
if (odev->type != ARPHRD_ETHER)
|
|
goto drop;
|
|
|
|
if (!(odev->flags & IFF_UP) || !netif_carrier_ok(odev))
|
|
goto drop;
|
|
|
|
skb_orphan(skb);
|
|
|
|
if (skb_warn_if_lro(skb))
|
|
goto drop;
|
|
|
|
skb_forward_csum(skb);
|
|
|
|
if (skb->len - ETH_HLEN > odev->mtu)
|
|
goto drop;
|
|
|
|
skb->dev = odev;
|
|
skb->protocol = eth->h_proto;
|
|
|
|
return dev_queue_xmit(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int input_action_end_dx6_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *orig_dst = skb_dst(skb);
|
|
struct in6_addr *nhaddr = NULL;
|
|
struct seg6_local_lwt *slwt;
|
|
|
|
slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
|
|
|
|
/* The inner packet is not associated to any local interface,
|
|
* so we do not call netif_rx().
|
|
*
|
|
* If slwt->nh6 is set to ::, then lookup the nexthop for the
|
|
* inner packet's DA. Otherwise, use the specified nexthop.
|
|
*/
|
|
if (!ipv6_addr_any(&slwt->nh6))
|
|
nhaddr = &slwt->nh6;
|
|
|
|
seg6_lookup_nexthop(skb, nhaddr, 0);
|
|
|
|
return dst_input(skb);
|
|
}
|
|
|
|
/* decapsulate and forward to specified nexthop */
|
|
static int input_action_end_dx6(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
/* this function accepts IPv6 encapsulated packets, with either
|
|
* an SRH with SL=0, or no SRH.
|
|
*/
|
|
|
|
if (!decap_and_validate(skb, IPPROTO_IPV6))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
goto drop;
|
|
|
|
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
|
|
nf_reset_ct(skb);
|
|
|
|
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
|
|
return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
|
|
dev_net(skb->dev), NULL, skb, NULL,
|
|
skb_dst(skb)->dev, input_action_end_dx6_finish);
|
|
|
|
return input_action_end_dx6_finish(dev_net(skb->dev), NULL, skb);
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int input_action_end_dx4_finish(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *orig_dst = skb_dst(skb);
|
|
struct seg6_local_lwt *slwt;
|
|
struct iphdr *iph;
|
|
__be32 nhaddr;
|
|
int err;
|
|
|
|
slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
nhaddr = slwt->nh4.s_addr ?: iph->daddr;
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
err = ip_route_input(skb, nhaddr, iph->saddr, 0, skb->dev);
|
|
if (err) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return dst_input(skb);
|
|
}
|
|
|
|
static int input_action_end_dx4(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
if (!decap_and_validate(skb, IPPROTO_IPIP))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb_set_transport_header(skb, sizeof(struct iphdr));
|
|
nf_reset_ct(skb);
|
|
|
|
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
|
|
return NF_HOOK(NFPROTO_IPV4, NF_INET_PRE_ROUTING,
|
|
dev_net(skb->dev), NULL, skb, NULL,
|
|
skb_dst(skb)->dev, input_action_end_dx4_finish);
|
|
|
|
return input_action_end_dx4_finish(dev_net(skb->dev), NULL, skb);
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_L3_MASTER_DEV
|
|
static struct net *fib6_config_get_net(const struct fib6_config *fib6_cfg)
|
|
{
|
|
const struct nl_info *nli = &fib6_cfg->fc_nlinfo;
|
|
|
|
return nli->nl_net;
|
|
}
|
|
|
|
static int __seg6_end_dt_vrf_build(struct seg6_local_lwt *slwt, const void *cfg,
|
|
u16 family, struct netlink_ext_ack *extack)
|
|
{
|
|
struct seg6_end_dt_info *info = &slwt->dt_info;
|
|
int vrf_ifindex;
|
|
struct net *net;
|
|
|
|
net = fib6_config_get_net(cfg);
|
|
|
|
/* note that vrf_table was already set by parse_nla_vrftable() */
|
|
vrf_ifindex = l3mdev_ifindex_lookup_by_table_id(L3MDEV_TYPE_VRF, net,
|
|
info->vrf_table);
|
|
if (vrf_ifindex < 0) {
|
|
if (vrf_ifindex == -EPERM) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Strict mode for VRF is disabled");
|
|
} else if (vrf_ifindex == -ENODEV) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Table has no associated VRF device");
|
|
} else {
|
|
pr_debug("seg6local: SRv6 End.DT* creation error=%d\n",
|
|
vrf_ifindex);
|
|
}
|
|
|
|
return vrf_ifindex;
|
|
}
|
|
|
|
info->net = net;
|
|
info->vrf_ifindex = vrf_ifindex;
|
|
|
|
info->family = family;
|
|
info->mode = DT_VRF_MODE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* The SRv6 End.DT4/DT6 behavior extracts the inner (IPv4/IPv6) packet and
|
|
* routes the IPv4/IPv6 packet by looking at the configured routing table.
|
|
*
|
|
* In the SRv6 End.DT4/DT6 use case, we can receive traffic (IPv6+Segment
|
|
* Routing Header packets) from several interfaces and the outer IPv6
|
|
* destination address (DA) is used for retrieving the specific instance of the
|
|
* End.DT4/DT6 behavior that should process the packets.
|
|
*
|
|
* However, the inner IPv4/IPv6 packet is not really bound to any receiving
|
|
* interface and thus the End.DT4/DT6 sets the VRF (associated with the
|
|
* corresponding routing table) as the *receiving* interface.
|
|
* In other words, the End.DT4/DT6 processes a packet as if it has been received
|
|
* directly by the VRF (and not by one of its slave devices, if any).
|
|
* In this way, the VRF interface is used for routing the IPv4/IPv6 packet in
|
|
* according to the routing table configured by the End.DT4/DT6 instance.
|
|
*
|
|
* This design allows you to get some interesting features like:
|
|
* 1) the statistics on rx packets;
|
|
* 2) the possibility to install a packet sniffer on the receiving interface
|
|
* (the VRF one) for looking at the incoming packets;
|
|
* 3) the possibility to leverage the netfilter prerouting hook for the inner
|
|
* IPv4 packet.
|
|
*
|
|
* This function returns:
|
|
* - the sk_buff* when the VRF rcv handler has processed the packet correctly;
|
|
* - NULL when the skb is consumed by the VRF rcv handler;
|
|
* - a pointer which encodes a negative error number in case of error.
|
|
* Note that in this case, the function takes care of freeing the skb.
|
|
*/
|
|
static struct sk_buff *end_dt_vrf_rcv(struct sk_buff *skb, u16 family,
|
|
struct net_device *dev)
|
|
{
|
|
/* based on l3mdev_ip_rcv; we are only interested in the master */
|
|
if (unlikely(!netif_is_l3_master(dev) && !netif_has_l3_rx_handler(dev)))
|
|
goto drop;
|
|
|
|
if (unlikely(!dev->l3mdev_ops->l3mdev_l3_rcv))
|
|
goto drop;
|
|
|
|
/* the decap packet IPv4/IPv6 does not come with any mac header info.
|
|
* We must unset the mac header to allow the VRF device to rebuild it,
|
|
* just in case there is a sniffer attached on the device.
|
|
*/
|
|
skb_unset_mac_header(skb);
|
|
|
|
skb = dev->l3mdev_ops->l3mdev_l3_rcv(dev, skb, family);
|
|
if (!skb)
|
|
/* the skb buffer was consumed by the handler */
|
|
return NULL;
|
|
|
|
/* when a packet is received by a VRF or by one of its slaves, the
|
|
* master device reference is set into the skb.
|
|
*/
|
|
if (unlikely(skb->dev != dev || skb->skb_iif != dev->ifindex))
|
|
goto drop;
|
|
|
|
return skb;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static struct net_device *end_dt_get_vrf_rcu(struct sk_buff *skb,
|
|
struct seg6_end_dt_info *info)
|
|
{
|
|
int vrf_ifindex = info->vrf_ifindex;
|
|
struct net *net = info->net;
|
|
|
|
if (unlikely(vrf_ifindex < 0))
|
|
goto error;
|
|
|
|
if (unlikely(!net_eq(dev_net(skb->dev), net)))
|
|
goto error;
|
|
|
|
return dev_get_by_index_rcu(net, vrf_ifindex);
|
|
|
|
error:
|
|
return NULL;
|
|
}
|
|
|
|
static struct sk_buff *end_dt_vrf_core(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt, u16 family)
|
|
{
|
|
struct seg6_end_dt_info *info = &slwt->dt_info;
|
|
struct net_device *vrf;
|
|
__be16 protocol;
|
|
int hdrlen;
|
|
|
|
vrf = end_dt_get_vrf_rcu(skb, info);
|
|
if (unlikely(!vrf))
|
|
goto drop;
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
protocol = htons(ETH_P_IP);
|
|
hdrlen = sizeof(struct iphdr);
|
|
break;
|
|
case AF_INET6:
|
|
protocol = htons(ETH_P_IPV6);
|
|
hdrlen = sizeof(struct ipv6hdr);
|
|
break;
|
|
case AF_UNSPEC:
|
|
fallthrough;
|
|
default:
|
|
goto drop;
|
|
}
|
|
|
|
if (unlikely(info->family != AF_UNSPEC && info->family != family)) {
|
|
pr_warn_once("seg6local: SRv6 End.DT* family mismatch");
|
|
goto drop;
|
|
}
|
|
|
|
skb->protocol = protocol;
|
|
|
|
skb_dst_drop(skb);
|
|
|
|
skb_set_transport_header(skb, hdrlen);
|
|
nf_reset_ct(skb);
|
|
|
|
return end_dt_vrf_rcv(skb, family, vrf);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static int input_action_end_dt4(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct iphdr *iph;
|
|
int err;
|
|
|
|
if (!decap_and_validate(skb, IPPROTO_IPIP))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
|
|
goto drop;
|
|
|
|
skb = end_dt_vrf_core(skb, slwt, AF_INET);
|
|
if (!skb)
|
|
/* packet has been processed and consumed by the VRF */
|
|
return 0;
|
|
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
err = ip_route_input(skb, iph->daddr, iph->saddr, 0, skb->dev);
|
|
if (unlikely(err))
|
|
goto drop;
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int seg6_end_dt4_build(struct seg6_local_lwt *slwt, const void *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET, extack);
|
|
}
|
|
|
|
static enum
|
|
seg6_end_dt_mode seg6_end_dt6_parse_mode(struct seg6_local_lwt *slwt)
|
|
{
|
|
unsigned long parsed_optattrs = slwt->parsed_optattrs;
|
|
bool legacy, vrfmode;
|
|
|
|
legacy = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE));
|
|
vrfmode = !!(parsed_optattrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE));
|
|
|
|
if (!(legacy ^ vrfmode))
|
|
/* both are absent or present: invalid DT6 mode */
|
|
return DT_INVALID_MODE;
|
|
|
|
return legacy ? DT_LEGACY_MODE : DT_VRF_MODE;
|
|
}
|
|
|
|
static enum seg6_end_dt_mode seg6_end_dt6_get_mode(struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_end_dt_info *info = &slwt->dt_info;
|
|
|
|
return info->mode;
|
|
}
|
|
|
|
static int seg6_end_dt6_build(struct seg6_local_lwt *slwt, const void *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
enum seg6_end_dt_mode mode = seg6_end_dt6_parse_mode(slwt);
|
|
struct seg6_end_dt_info *info = &slwt->dt_info;
|
|
|
|
switch (mode) {
|
|
case DT_LEGACY_MODE:
|
|
info->mode = DT_LEGACY_MODE;
|
|
return 0;
|
|
case DT_VRF_MODE:
|
|
return __seg6_end_dt_vrf_build(slwt, cfg, AF_INET6, extack);
|
|
default:
|
|
NL_SET_ERR_MSG(extack, "table or vrftable must be specified");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static int input_action_end_dt6(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
if (!decap_and_validate(skb, IPPROTO_IPV6))
|
|
goto drop;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
|
|
goto drop;
|
|
|
|
#ifdef CONFIG_NET_L3_MASTER_DEV
|
|
if (seg6_end_dt6_get_mode(slwt) == DT_LEGACY_MODE)
|
|
goto legacy_mode;
|
|
|
|
/* DT6_VRF_MODE */
|
|
skb = end_dt_vrf_core(skb, slwt, AF_INET6);
|
|
if (!skb)
|
|
/* packet has been processed and consumed by the VRF */
|
|
return 0;
|
|
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
/* note: this time we do not need to specify the table because the VRF
|
|
* takes care of selecting the correct table.
|
|
*/
|
|
seg6_lookup_any_nexthop(skb, NULL, 0, true);
|
|
|
|
return dst_input(skb);
|
|
|
|
legacy_mode:
|
|
#endif
|
|
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
|
|
|
|
seg6_lookup_any_nexthop(skb, NULL, slwt->table, true);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_NET_L3_MASTER_DEV
|
|
static int seg6_end_dt46_build(struct seg6_local_lwt *slwt, const void *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __seg6_end_dt_vrf_build(slwt, cfg, AF_UNSPEC, extack);
|
|
}
|
|
|
|
static int input_action_end_dt46(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
unsigned int off = 0;
|
|
int nexthdr;
|
|
|
|
nexthdr = ipv6_find_hdr(skb, &off, -1, NULL, NULL);
|
|
if (unlikely(nexthdr < 0))
|
|
goto drop;
|
|
|
|
switch (nexthdr) {
|
|
case IPPROTO_IPIP:
|
|
return input_action_end_dt4(skb, slwt);
|
|
case IPPROTO_IPV6:
|
|
return input_action_end_dt6(skb, slwt);
|
|
}
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
#endif
|
|
|
|
/* push an SRH on top of the current one */
|
|
static int input_action_end_b6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
int err = -EINVAL;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
err = seg6_do_srh_inline(skb, slwt->srh);
|
|
if (err)
|
|
goto drop;
|
|
|
|
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
|
|
|
|
seg6_lookup_nexthop(skb, NULL, 0);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
/* encapsulate within an outer IPv6 header and a specified SRH */
|
|
static int input_action_end_b6_encap(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
int err = -EINVAL;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh)
|
|
goto drop;
|
|
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
skb_reset_inner_headers(skb);
|
|
skb->encapsulation = 1;
|
|
|
|
err = seg6_do_srh_encap(skb, slwt->srh, IPPROTO_IPV6);
|
|
if (err)
|
|
goto drop;
|
|
|
|
skb_set_transport_header(skb, sizeof(struct ipv6hdr));
|
|
|
|
seg6_lookup_nexthop(skb, NULL, 0);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
DEFINE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states);
|
|
|
|
bool seg6_bpf_has_valid_srh(struct sk_buff *skb)
|
|
{
|
|
struct seg6_bpf_srh_state *srh_state =
|
|
this_cpu_ptr(&seg6_bpf_srh_states);
|
|
struct ipv6_sr_hdr *srh = srh_state->srh;
|
|
|
|
if (unlikely(srh == NULL))
|
|
return false;
|
|
|
|
if (unlikely(!srh_state->valid)) {
|
|
if ((srh_state->hdrlen & 7) != 0)
|
|
return false;
|
|
|
|
srh->hdrlen = (u8)(srh_state->hdrlen >> 3);
|
|
if (!seg6_validate_srh(srh, (srh->hdrlen + 1) << 3, true))
|
|
return false;
|
|
|
|
srh_state->valid = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static int input_action_end_bpf(struct sk_buff *skb,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_bpf_srh_state *srh_state =
|
|
this_cpu_ptr(&seg6_bpf_srh_states);
|
|
struct ipv6_sr_hdr *srh;
|
|
int ret;
|
|
|
|
srh = get_and_validate_srh(skb);
|
|
if (!srh) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
advance_nextseg(srh, &ipv6_hdr(skb)->daddr);
|
|
|
|
/* preempt_disable is needed to protect the per-CPU buffer srh_state,
|
|
* which is also accessed by the bpf_lwt_seg6_* helpers
|
|
*/
|
|
preempt_disable();
|
|
srh_state->srh = srh;
|
|
srh_state->hdrlen = srh->hdrlen << 3;
|
|
srh_state->valid = true;
|
|
|
|
rcu_read_lock();
|
|
bpf_compute_data_pointers(skb);
|
|
ret = bpf_prog_run_save_cb(slwt->bpf.prog, skb);
|
|
rcu_read_unlock();
|
|
|
|
switch (ret) {
|
|
case BPF_OK:
|
|
case BPF_REDIRECT:
|
|
break;
|
|
case BPF_DROP:
|
|
goto drop;
|
|
default:
|
|
pr_warn_once("bpf-seg6local: Illegal return value %u\n", ret);
|
|
goto drop;
|
|
}
|
|
|
|
if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
|
|
goto drop;
|
|
|
|
preempt_enable();
|
|
if (ret != BPF_REDIRECT)
|
|
seg6_lookup_nexthop(skb, NULL, 0);
|
|
|
|
return dst_input(skb);
|
|
|
|
drop:
|
|
preempt_enable();
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct seg6_action_desc seg6_action_table[] = {
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END,
|
|
.attrs = 0,
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS |
|
|
SEG6_F_LOCAL_FLAVORS,
|
|
.input = input_action_end,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_X,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS |
|
|
SEG6_F_LOCAL_FLAVORS,
|
|
.input = input_action_end_x,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_T,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
.input = input_action_end_t,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DX2,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_OIF),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
.input = input_action_end_dx2,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DX6,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_NH6),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
.input = input_action_end_dx6,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DX4,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_NH4),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
.input = input_action_end_dx4,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DT4,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
#ifdef CONFIG_NET_L3_MASTER_DEV
|
|
.input = input_action_end_dt4,
|
|
.slwt_ops = {
|
|
.build_state = seg6_end_dt4_build,
|
|
},
|
|
#endif
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DT6,
|
|
#ifdef CONFIG_NET_L3_MASTER_DEV
|
|
.attrs = 0,
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS |
|
|
SEG6_F_ATTR(SEG6_LOCAL_TABLE) |
|
|
SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE),
|
|
.slwt_ops = {
|
|
.build_state = seg6_end_dt6_build,
|
|
},
|
|
#else
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_TABLE),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
#endif
|
|
.input = input_action_end_dt6,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_DT46,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
#ifdef CONFIG_NET_L3_MASTER_DEV
|
|
.input = input_action_end_dt46,
|
|
.slwt_ops = {
|
|
.build_state = seg6_end_dt46_build,
|
|
},
|
|
#endif
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_B6,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
.input = input_action_end_b6,
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_B6_ENCAP,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_SRH),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
.input = input_action_end_b6_encap,
|
|
.static_headroom = sizeof(struct ipv6hdr),
|
|
},
|
|
{
|
|
.action = SEG6_LOCAL_ACTION_END_BPF,
|
|
.attrs = SEG6_F_ATTR(SEG6_LOCAL_BPF),
|
|
.optattrs = SEG6_F_LOCAL_COUNTERS,
|
|
.input = input_action_end_bpf,
|
|
},
|
|
|
|
};
|
|
|
|
static struct seg6_action_desc *__get_action_desc(int action)
|
|
{
|
|
struct seg6_action_desc *desc;
|
|
int i, count;
|
|
|
|
count = ARRAY_SIZE(seg6_action_table);
|
|
for (i = 0; i < count; i++) {
|
|
desc = &seg6_action_table[i];
|
|
if (desc->action == action)
|
|
return desc;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static bool seg6_lwtunnel_counters_enabled(struct seg6_local_lwt *slwt)
|
|
{
|
|
return slwt->parsed_optattrs & SEG6_F_LOCAL_COUNTERS;
|
|
}
|
|
|
|
static void seg6_local_update_counters(struct seg6_local_lwt *slwt,
|
|
unsigned int len, int err)
|
|
{
|
|
struct pcpu_seg6_local_counters *pcounters;
|
|
|
|
pcounters = this_cpu_ptr(slwt->pcpu_counters);
|
|
u64_stats_update_begin(&pcounters->syncp);
|
|
|
|
if (likely(!err)) {
|
|
u64_stats_inc(&pcounters->packets);
|
|
u64_stats_add(&pcounters->bytes, len);
|
|
} else {
|
|
u64_stats_inc(&pcounters->errors);
|
|
}
|
|
|
|
u64_stats_update_end(&pcounters->syncp);
|
|
}
|
|
|
|
static int seg6_local_input_core(struct net *net, struct sock *sk,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *orig_dst = skb_dst(skb);
|
|
struct seg6_action_desc *desc;
|
|
struct seg6_local_lwt *slwt;
|
|
unsigned int len = skb->len;
|
|
int rc;
|
|
|
|
slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
|
|
desc = slwt->desc;
|
|
|
|
rc = desc->input(skb, slwt);
|
|
|
|
if (!seg6_lwtunnel_counters_enabled(slwt))
|
|
return rc;
|
|
|
|
seg6_local_update_counters(slwt, len, rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int seg6_local_input(struct sk_buff *skb)
|
|
{
|
|
if (skb->protocol != htons(ETH_P_IPV6)) {
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (static_branch_unlikely(&nf_hooks_lwtunnel_enabled))
|
|
return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_IN,
|
|
dev_net(skb->dev), NULL, skb, skb->dev, NULL,
|
|
seg6_local_input_core);
|
|
|
|
return seg6_local_input_core(dev_net(skb->dev), NULL, skb);
|
|
}
|
|
|
|
static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
|
|
[SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
|
|
[SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_VRFTABLE] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
|
|
.len = sizeof(struct in_addr) },
|
|
[SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
|
|
.len = sizeof(struct in6_addr) },
|
|
[SEG6_LOCAL_IIF] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_OIF] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_BPF] = { .type = NLA_NESTED },
|
|
[SEG6_LOCAL_COUNTERS] = { .type = NLA_NESTED },
|
|
[SEG6_LOCAL_FLAVORS] = { .type = NLA_NESTED },
|
|
};
|
|
|
|
static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
int len;
|
|
|
|
srh = nla_data(attrs[SEG6_LOCAL_SRH]);
|
|
len = nla_len(attrs[SEG6_LOCAL_SRH]);
|
|
|
|
/* SRH must contain at least one segment */
|
|
if (len < sizeof(*srh) + sizeof(struct in6_addr))
|
|
return -EINVAL;
|
|
|
|
if (!seg6_validate_srh(srh, len, false))
|
|
return -EINVAL;
|
|
|
|
slwt->srh = kmemdup(srh, len, GFP_KERNEL);
|
|
if (!slwt->srh)
|
|
return -ENOMEM;
|
|
|
|
slwt->headroom += len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct ipv6_sr_hdr *srh;
|
|
struct nlattr *nla;
|
|
int len;
|
|
|
|
srh = slwt->srh;
|
|
len = (srh->hdrlen + 1) << 3;
|
|
|
|
nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), srh, len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
int len = (a->srh->hdrlen + 1) << 3;
|
|
|
|
if (len != ((b->srh->hdrlen + 1) << 3))
|
|
return 1;
|
|
|
|
return memcmp(a->srh, b->srh, len);
|
|
}
|
|
|
|
static void destroy_attr_srh(struct seg6_local_lwt *slwt)
|
|
{
|
|
kfree(slwt->srh);
|
|
}
|
|
|
|
static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (a->table != b->table)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct
|
|
seg6_end_dt_info *seg6_possible_end_dt_info(struct seg6_local_lwt *slwt)
|
|
{
|
|
#ifdef CONFIG_NET_L3_MASTER_DEV
|
|
return &slwt->dt_info;
|
|
#else
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
#endif
|
|
}
|
|
|
|
static int parse_nla_vrftable(struct nlattr **attrs,
|
|
struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt);
|
|
|
|
if (IS_ERR(info))
|
|
return PTR_ERR(info);
|
|
|
|
info->vrf_table = nla_get_u32(attrs[SEG6_LOCAL_VRFTABLE]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_vrftable(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_end_dt_info *info = seg6_possible_end_dt_info(slwt);
|
|
|
|
if (IS_ERR(info))
|
|
return PTR_ERR(info);
|
|
|
|
if (nla_put_u32(skb, SEG6_LOCAL_VRFTABLE, info->vrf_table))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_vrftable(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
struct seg6_end_dt_info *info_a = seg6_possible_end_dt_info(a);
|
|
struct seg6_end_dt_info *info_b = seg6_possible_end_dt_info(b);
|
|
|
|
if (info_a->vrf_table != info_b->vrf_table)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
|
|
sizeof(struct in_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
|
|
}
|
|
|
|
static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
|
|
sizeof(struct in6_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
|
|
if (!nla)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
|
|
}
|
|
|
|
static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (a->iif != b->iif)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (a->oif != b->oif)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define MAX_PROG_NAME 256
|
|
static const struct nla_policy bpf_prog_policy[SEG6_LOCAL_BPF_PROG_MAX + 1] = {
|
|
[SEG6_LOCAL_BPF_PROG] = { .type = NLA_U32, },
|
|
[SEG6_LOCAL_BPF_PROG_NAME] = { .type = NLA_NUL_STRING,
|
|
.len = MAX_PROG_NAME },
|
|
};
|
|
|
|
static int parse_nla_bpf(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[SEG6_LOCAL_BPF_PROG_MAX + 1];
|
|
struct bpf_prog *p;
|
|
int ret;
|
|
u32 fd;
|
|
|
|
ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_BPF_PROG_MAX,
|
|
attrs[SEG6_LOCAL_BPF],
|
|
bpf_prog_policy, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!tb[SEG6_LOCAL_BPF_PROG] || !tb[SEG6_LOCAL_BPF_PROG_NAME])
|
|
return -EINVAL;
|
|
|
|
slwt->bpf.name = nla_memdup(tb[SEG6_LOCAL_BPF_PROG_NAME], GFP_KERNEL);
|
|
if (!slwt->bpf.name)
|
|
return -ENOMEM;
|
|
|
|
fd = nla_get_u32(tb[SEG6_LOCAL_BPF_PROG]);
|
|
p = bpf_prog_get_type(fd, BPF_PROG_TYPE_LWT_SEG6LOCAL);
|
|
if (IS_ERR(p)) {
|
|
kfree(slwt->bpf.name);
|
|
return PTR_ERR(p);
|
|
}
|
|
|
|
slwt->bpf.prog = p;
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_bpf(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct nlattr *nest;
|
|
|
|
if (!slwt->bpf.prog)
|
|
return 0;
|
|
|
|
nest = nla_nest_start_noflag(skb, SEG6_LOCAL_BPF);
|
|
if (!nest)
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u32(skb, SEG6_LOCAL_BPF_PROG, slwt->bpf.prog->aux->id))
|
|
return -EMSGSIZE;
|
|
|
|
if (slwt->bpf.name &&
|
|
nla_put_string(skb, SEG6_LOCAL_BPF_PROG_NAME, slwt->bpf.name))
|
|
return -EMSGSIZE;
|
|
|
|
return nla_nest_end(skb, nest);
|
|
}
|
|
|
|
static int cmp_nla_bpf(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
if (!a->bpf.name && !b->bpf.name)
|
|
return 0;
|
|
|
|
if (!a->bpf.name || !b->bpf.name)
|
|
return 1;
|
|
|
|
return strcmp(a->bpf.name, b->bpf.name);
|
|
}
|
|
|
|
static void destroy_attr_bpf(struct seg6_local_lwt *slwt)
|
|
{
|
|
kfree(slwt->bpf.name);
|
|
if (slwt->bpf.prog)
|
|
bpf_prog_put(slwt->bpf.prog);
|
|
}
|
|
|
|
static const struct
|
|
nla_policy seg6_local_counters_policy[SEG6_LOCAL_CNT_MAX + 1] = {
|
|
[SEG6_LOCAL_CNT_PACKETS] = { .type = NLA_U64 },
|
|
[SEG6_LOCAL_CNT_BYTES] = { .type = NLA_U64 },
|
|
[SEG6_LOCAL_CNT_ERRORS] = { .type = NLA_U64 },
|
|
};
|
|
|
|
static int parse_nla_counters(struct nlattr **attrs,
|
|
struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct pcpu_seg6_local_counters __percpu *pcounters;
|
|
struct nlattr *tb[SEG6_LOCAL_CNT_MAX + 1];
|
|
int ret;
|
|
|
|
ret = nla_parse_nested_deprecated(tb, SEG6_LOCAL_CNT_MAX,
|
|
attrs[SEG6_LOCAL_COUNTERS],
|
|
seg6_local_counters_policy, NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* basic support for SRv6 Behavior counters requires at least:
|
|
* packets, bytes and errors.
|
|
*/
|
|
if (!tb[SEG6_LOCAL_CNT_PACKETS] || !tb[SEG6_LOCAL_CNT_BYTES] ||
|
|
!tb[SEG6_LOCAL_CNT_ERRORS])
|
|
return -EINVAL;
|
|
|
|
/* counters are always zero initialized */
|
|
pcounters = seg6_local_alloc_pcpu_counters(GFP_KERNEL);
|
|
if (!pcounters)
|
|
return -ENOMEM;
|
|
|
|
slwt->pcpu_counters = pcounters;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_local_fill_nla_counters(struct sk_buff *skb,
|
|
struct seg6_local_counters *counters)
|
|
{
|
|
if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_PACKETS, counters->packets,
|
|
SEG6_LOCAL_CNT_PAD))
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_BYTES, counters->bytes,
|
|
SEG6_LOCAL_CNT_PAD))
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u64_64bit(skb, SEG6_LOCAL_CNT_ERRORS, counters->errors,
|
|
SEG6_LOCAL_CNT_PAD))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_counters(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_local_counters counters = { 0, 0, 0 };
|
|
struct nlattr *nest;
|
|
int rc, i;
|
|
|
|
nest = nla_nest_start(skb, SEG6_LOCAL_COUNTERS);
|
|
if (!nest)
|
|
return -EMSGSIZE;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct pcpu_seg6_local_counters *pcounters;
|
|
u64 packets, bytes, errors;
|
|
unsigned int start;
|
|
|
|
pcounters = per_cpu_ptr(slwt->pcpu_counters, i);
|
|
do {
|
|
start = u64_stats_fetch_begin(&pcounters->syncp);
|
|
|
|
packets = u64_stats_read(&pcounters->packets);
|
|
bytes = u64_stats_read(&pcounters->bytes);
|
|
errors = u64_stats_read(&pcounters->errors);
|
|
|
|
} while (u64_stats_fetch_retry(&pcounters->syncp, start));
|
|
|
|
counters.packets += packets;
|
|
counters.bytes += bytes;
|
|
counters.errors += errors;
|
|
}
|
|
|
|
rc = seg6_local_fill_nla_counters(skb, &counters);
|
|
if (rc < 0) {
|
|
nla_nest_cancel(skb, nest);
|
|
return rc;
|
|
}
|
|
|
|
return nla_nest_end(skb, nest);
|
|
}
|
|
|
|
static int cmp_nla_counters(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
/* a and b are equal if both have pcpu_counters set or not */
|
|
return (!!((unsigned long)a->pcpu_counters)) ^
|
|
(!!((unsigned long)b->pcpu_counters));
|
|
}
|
|
|
|
static void destroy_attr_counters(struct seg6_local_lwt *slwt)
|
|
{
|
|
free_percpu(slwt->pcpu_counters);
|
|
}
|
|
|
|
static const
|
|
struct nla_policy seg6_local_flavors_policy[SEG6_LOCAL_FLV_MAX + 1] = {
|
|
[SEG6_LOCAL_FLV_OPERATION] = { .type = NLA_U32 },
|
|
[SEG6_LOCAL_FLV_LCBLOCK_BITS] = { .type = NLA_U8 },
|
|
[SEG6_LOCAL_FLV_LCNODE_FN_BITS] = { .type = NLA_U8 },
|
|
};
|
|
|
|
/* check whether the lengths of the Locator-Block and Locator-Node Function
|
|
* are compatible with the dimension of a C-SID container.
|
|
*/
|
|
static int seg6_chk_next_csid_cfg(__u8 block_len, __u8 func_len)
|
|
{
|
|
/* Locator-Block and Locator-Node Function cannot exceed 128 bits
|
|
* (i.e. C-SID container lenghts).
|
|
*/
|
|
if (next_csid_chk_cntr_bits(block_len, func_len))
|
|
return -EINVAL;
|
|
|
|
/* Locator-Block length must be greater than zero and evenly divisible
|
|
* by 8. There must be room for a Locator-Node Function, at least.
|
|
*/
|
|
if (next_csid_chk_lcblock_bits(block_len))
|
|
return -EINVAL;
|
|
|
|
/* Locator-Node Function length must be greater than zero and evenly
|
|
* divisible by 8. There must be room for the Locator-Block.
|
|
*/
|
|
if (next_csid_chk_lcnode_fn_bits(func_len))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_parse_nla_next_csid_cfg(struct nlattr **tb,
|
|
struct seg6_flavors_info *finfo,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
__u8 func_len = SEG6_LOCAL_LCNODE_FN_DBITS;
|
|
__u8 block_len = SEG6_LOCAL_LCBLOCK_DBITS;
|
|
int rc;
|
|
|
|
if (tb[SEG6_LOCAL_FLV_LCBLOCK_BITS])
|
|
block_len = nla_get_u8(tb[SEG6_LOCAL_FLV_LCBLOCK_BITS]);
|
|
|
|
if (tb[SEG6_LOCAL_FLV_LCNODE_FN_BITS])
|
|
func_len = nla_get_u8(tb[SEG6_LOCAL_FLV_LCNODE_FN_BITS]);
|
|
|
|
rc = seg6_chk_next_csid_cfg(block_len, func_len);
|
|
if (rc < 0) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"Invalid Locator Block/Node Function lengths");
|
|
return rc;
|
|
}
|
|
|
|
finfo->lcblock_bits = block_len;
|
|
finfo->lcnode_func_bits = func_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_nla_flavors(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct seg6_flavors_info *finfo = &slwt->flv_info;
|
|
struct nlattr *tb[SEG6_LOCAL_FLV_MAX + 1];
|
|
int action = slwt->action;
|
|
__u32 fops, supp_fops;
|
|
int rc;
|
|
|
|
rc = nla_parse_nested_deprecated(tb, SEG6_LOCAL_FLV_MAX,
|
|
attrs[SEG6_LOCAL_FLAVORS],
|
|
seg6_local_flavors_policy, NULL);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* this attribute MUST always be present since it represents the Flavor
|
|
* operation(s) to be carried out.
|
|
*/
|
|
if (!tb[SEG6_LOCAL_FLV_OPERATION])
|
|
return -EINVAL;
|
|
|
|
fops = nla_get_u32(tb[SEG6_LOCAL_FLV_OPERATION]);
|
|
rc = seg6_flv_supp_ops_by_action(action, &supp_fops);
|
|
if (rc < 0 || (fops & ~supp_fops)) {
|
|
NL_SET_ERR_MSG(extack, "Unsupported Flavor operation(s)");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
finfo->flv_ops = fops;
|
|
|
|
if (seg6_next_csid_enabled(fops)) {
|
|
/* Locator-Block and Locator-Node Function lengths can be
|
|
* provided by the user space. Otherwise, default values are
|
|
* applied.
|
|
*/
|
|
rc = seg6_parse_nla_next_csid_cfg(tb, finfo, extack);
|
|
if (rc < 0)
|
|
return rc;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_fill_nla_next_csid_cfg(struct sk_buff *skb,
|
|
struct seg6_flavors_info *finfo)
|
|
{
|
|
if (nla_put_u8(skb, SEG6_LOCAL_FLV_LCBLOCK_BITS, finfo->lcblock_bits))
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u8(skb, SEG6_LOCAL_FLV_LCNODE_FN_BITS,
|
|
finfo->lcnode_func_bits))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int put_nla_flavors(struct sk_buff *skb, struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_flavors_info *finfo = &slwt->flv_info;
|
|
__u32 fops = finfo->flv_ops;
|
|
struct nlattr *nest;
|
|
int rc;
|
|
|
|
nest = nla_nest_start(skb, SEG6_LOCAL_FLAVORS);
|
|
if (!nest)
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u32(skb, SEG6_LOCAL_FLV_OPERATION, fops)) {
|
|
rc = -EMSGSIZE;
|
|
goto err;
|
|
}
|
|
|
|
if (seg6_next_csid_enabled(fops)) {
|
|
rc = seg6_fill_nla_next_csid_cfg(skb, finfo);
|
|
if (rc < 0)
|
|
goto err;
|
|
}
|
|
|
|
return nla_nest_end(skb, nest);
|
|
|
|
err:
|
|
nla_nest_cancel(skb, nest);
|
|
return rc;
|
|
}
|
|
|
|
static int seg6_cmp_nla_next_csid_cfg(struct seg6_flavors_info *finfo_a,
|
|
struct seg6_flavors_info *finfo_b)
|
|
{
|
|
if (finfo_a->lcblock_bits != finfo_b->lcblock_bits)
|
|
return 1;
|
|
|
|
if (finfo_a->lcnode_func_bits != finfo_b->lcnode_func_bits)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cmp_nla_flavors(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
|
|
{
|
|
struct seg6_flavors_info *finfo_a = &a->flv_info;
|
|
struct seg6_flavors_info *finfo_b = &b->flv_info;
|
|
|
|
if (finfo_a->flv_ops != finfo_b->flv_ops)
|
|
return 1;
|
|
|
|
if (seg6_next_csid_enabled(finfo_a->flv_ops)) {
|
|
if (seg6_cmp_nla_next_csid_cfg(finfo_a, finfo_b))
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int encap_size_flavors(struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_flavors_info *finfo = &slwt->flv_info;
|
|
int nlsize;
|
|
|
|
nlsize = nla_total_size(0) + /* nest SEG6_LOCAL_FLAVORS */
|
|
nla_total_size(4); /* SEG6_LOCAL_FLV_OPERATION */
|
|
|
|
if (seg6_next_csid_enabled(finfo->flv_ops))
|
|
nlsize += nla_total_size(1) + /* SEG6_LOCAL_FLV_LCBLOCK_BITS */
|
|
nla_total_size(1); /* SEG6_LOCAL_FLV_LCNODE_FN_BITS */
|
|
|
|
return nlsize;
|
|
}
|
|
|
|
struct seg6_action_param {
|
|
int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack);
|
|
int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
|
|
int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
|
|
|
|
/* optional destroy() callback useful for releasing resources which
|
|
* have been previously acquired in the corresponding parse()
|
|
* function.
|
|
*/
|
|
void (*destroy)(struct seg6_local_lwt *slwt);
|
|
};
|
|
|
|
static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
|
|
[SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
|
|
.put = put_nla_srh,
|
|
.cmp = cmp_nla_srh,
|
|
.destroy = destroy_attr_srh },
|
|
|
|
[SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
|
|
.put = put_nla_table,
|
|
.cmp = cmp_nla_table },
|
|
|
|
[SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
|
|
.put = put_nla_nh4,
|
|
.cmp = cmp_nla_nh4 },
|
|
|
|
[SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
|
|
.put = put_nla_nh6,
|
|
.cmp = cmp_nla_nh6 },
|
|
|
|
[SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
|
|
.put = put_nla_iif,
|
|
.cmp = cmp_nla_iif },
|
|
|
|
[SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
|
|
.put = put_nla_oif,
|
|
.cmp = cmp_nla_oif },
|
|
|
|
[SEG6_LOCAL_BPF] = { .parse = parse_nla_bpf,
|
|
.put = put_nla_bpf,
|
|
.cmp = cmp_nla_bpf,
|
|
.destroy = destroy_attr_bpf },
|
|
|
|
[SEG6_LOCAL_VRFTABLE] = { .parse = parse_nla_vrftable,
|
|
.put = put_nla_vrftable,
|
|
.cmp = cmp_nla_vrftable },
|
|
|
|
[SEG6_LOCAL_COUNTERS] = { .parse = parse_nla_counters,
|
|
.put = put_nla_counters,
|
|
.cmp = cmp_nla_counters,
|
|
.destroy = destroy_attr_counters },
|
|
|
|
[SEG6_LOCAL_FLAVORS] = { .parse = parse_nla_flavors,
|
|
.put = put_nla_flavors,
|
|
.cmp = cmp_nla_flavors },
|
|
};
|
|
|
|
/* call the destroy() callback (if available) for each set attribute in
|
|
* @parsed_attrs, starting from the first attribute up to the @max_parsed
|
|
* (excluded) attribute.
|
|
*/
|
|
static void __destroy_attrs(unsigned long parsed_attrs, int max_parsed,
|
|
struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_action_param *param;
|
|
int i;
|
|
|
|
/* Every required seg6local attribute is identified by an ID which is
|
|
* encoded as a flag (i.e: 1 << ID) in the 'attrs' bitmask;
|
|
*
|
|
* We scan the 'parsed_attrs' bitmask, starting from the first attribute
|
|
* up to the @max_parsed (excluded) attribute.
|
|
* For each set attribute, we retrieve the corresponding destroy()
|
|
* callback. If the callback is not available, then we skip to the next
|
|
* attribute; otherwise, we call the destroy() callback.
|
|
*/
|
|
for (i = SEG6_LOCAL_SRH; i < max_parsed; ++i) {
|
|
if (!(parsed_attrs & SEG6_F_ATTR(i)))
|
|
continue;
|
|
|
|
param = &seg6_action_params[i];
|
|
|
|
if (param->destroy)
|
|
param->destroy(slwt);
|
|
}
|
|
}
|
|
|
|
/* release all the resources that may have been acquired during parsing
|
|
* operations.
|
|
*/
|
|
static void destroy_attrs(struct seg6_local_lwt *slwt)
|
|
{
|
|
unsigned long attrs = slwt->desc->attrs | slwt->parsed_optattrs;
|
|
|
|
__destroy_attrs(attrs, SEG6_LOCAL_MAX + 1, slwt);
|
|
}
|
|
|
|
static int parse_nla_optional_attrs(struct nlattr **attrs,
|
|
struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct seg6_action_desc *desc = slwt->desc;
|
|
unsigned long parsed_optattrs = 0;
|
|
struct seg6_action_param *param;
|
|
int err, i;
|
|
|
|
for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; ++i) {
|
|
if (!(desc->optattrs & SEG6_F_ATTR(i)) || !attrs[i])
|
|
continue;
|
|
|
|
/* once here, the i-th attribute is provided by the
|
|
* userspace AND it is identified optional as well.
|
|
*/
|
|
param = &seg6_action_params[i];
|
|
|
|
err = param->parse(attrs, slwt, extack);
|
|
if (err < 0)
|
|
goto parse_optattrs_err;
|
|
|
|
/* current attribute has been correctly parsed */
|
|
parsed_optattrs |= SEG6_F_ATTR(i);
|
|
}
|
|
|
|
/* store in the tunnel state all the optional attributed successfully
|
|
* parsed.
|
|
*/
|
|
slwt->parsed_optattrs = parsed_optattrs;
|
|
|
|
return 0;
|
|
|
|
parse_optattrs_err:
|
|
__destroy_attrs(parsed_optattrs, i, slwt);
|
|
|
|
return err;
|
|
}
|
|
|
|
/* call the custom constructor of the behavior during its initialization phase
|
|
* and after that all its attributes have been parsed successfully.
|
|
*/
|
|
static int
|
|
seg6_local_lwtunnel_build_state(struct seg6_local_lwt *slwt, const void *cfg,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct seg6_action_desc *desc = slwt->desc;
|
|
struct seg6_local_lwtunnel_ops *ops;
|
|
|
|
ops = &desc->slwt_ops;
|
|
if (!ops->build_state)
|
|
return 0;
|
|
|
|
return ops->build_state(slwt, cfg, extack);
|
|
}
|
|
|
|
/* call the custom destructor of the behavior which is invoked before the
|
|
* tunnel is going to be destroyed.
|
|
*/
|
|
static void seg6_local_lwtunnel_destroy_state(struct seg6_local_lwt *slwt)
|
|
{
|
|
struct seg6_action_desc *desc = slwt->desc;
|
|
struct seg6_local_lwtunnel_ops *ops;
|
|
|
|
ops = &desc->slwt_ops;
|
|
if (!ops->destroy_state)
|
|
return;
|
|
|
|
ops->destroy_state(slwt);
|
|
}
|
|
|
|
static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct seg6_action_param *param;
|
|
struct seg6_action_desc *desc;
|
|
unsigned long invalid_attrs;
|
|
int i, err;
|
|
|
|
desc = __get_action_desc(slwt->action);
|
|
if (!desc)
|
|
return -EINVAL;
|
|
|
|
if (!desc->input)
|
|
return -EOPNOTSUPP;
|
|
|
|
slwt->desc = desc;
|
|
slwt->headroom += desc->static_headroom;
|
|
|
|
/* Forcing the desc->optattrs *set* and the desc->attrs *set* to be
|
|
* disjoined, this allow us to release acquired resources by optional
|
|
* attributes and by required attributes independently from each other
|
|
* without any interference.
|
|
* In other terms, we are sure that we do not release some the acquired
|
|
* resources twice.
|
|
*
|
|
* Note that if an attribute is configured both as required and as
|
|
* optional, it means that the user has messed something up in the
|
|
* seg6_action_table. Therefore, this check is required for SRv6
|
|
* behaviors to work properly.
|
|
*/
|
|
invalid_attrs = desc->attrs & desc->optattrs;
|
|
if (invalid_attrs) {
|
|
WARN_ONCE(1,
|
|
"An attribute cannot be both required AND optional");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* parse the required attributes */
|
|
for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (desc->attrs & SEG6_F_ATTR(i)) {
|
|
if (!attrs[i])
|
|
return -EINVAL;
|
|
|
|
param = &seg6_action_params[i];
|
|
|
|
err = param->parse(attrs, slwt, extack);
|
|
if (err < 0)
|
|
goto parse_attrs_err;
|
|
}
|
|
}
|
|
|
|
/* parse the optional attributes, if any */
|
|
err = parse_nla_optional_attrs(attrs, slwt, extack);
|
|
if (err < 0)
|
|
goto parse_attrs_err;
|
|
|
|
return 0;
|
|
|
|
parse_attrs_err:
|
|
/* release any resource that may have been acquired during the i-1
|
|
* parse() operations.
|
|
*/
|
|
__destroy_attrs(desc->attrs, i, slwt);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int seg6_local_build_state(struct net *net, struct nlattr *nla,
|
|
unsigned int family, const void *cfg,
|
|
struct lwtunnel_state **ts,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[SEG6_LOCAL_MAX + 1];
|
|
struct lwtunnel_state *newts;
|
|
struct seg6_local_lwt *slwt;
|
|
int err;
|
|
|
|
if (family != AF_INET6)
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(tb, SEG6_LOCAL_MAX, nla,
|
|
seg6_local_policy, extack);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[SEG6_LOCAL_ACTION])
|
|
return -EINVAL;
|
|
|
|
newts = lwtunnel_state_alloc(sizeof(*slwt));
|
|
if (!newts)
|
|
return -ENOMEM;
|
|
|
|
slwt = seg6_local_lwtunnel(newts);
|
|
slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
|
|
|
|
err = parse_nla_action(tb, slwt, extack);
|
|
if (err < 0)
|
|
goto out_free;
|
|
|
|
err = seg6_local_lwtunnel_build_state(slwt, cfg, extack);
|
|
if (err < 0)
|
|
goto out_destroy_attrs;
|
|
|
|
newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
|
|
newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
|
|
newts->headroom = slwt->headroom;
|
|
|
|
*ts = newts;
|
|
|
|
return 0;
|
|
|
|
out_destroy_attrs:
|
|
destroy_attrs(slwt);
|
|
out_free:
|
|
kfree(newts);
|
|
return err;
|
|
}
|
|
|
|
static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
|
|
seg6_local_lwtunnel_destroy_state(slwt);
|
|
|
|
destroy_attrs(slwt);
|
|
|
|
return;
|
|
}
|
|
|
|
static int seg6_local_fill_encap(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
struct seg6_action_param *param;
|
|
unsigned long attrs;
|
|
int i, err;
|
|
|
|
if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
|
|
return -EMSGSIZE;
|
|
|
|
attrs = slwt->desc->attrs | slwt->parsed_optattrs;
|
|
|
|
for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (attrs & SEG6_F_ATTR(i)) {
|
|
param = &seg6_action_params[i];
|
|
err = param->put(skb, slwt);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
|
|
{
|
|
struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
|
|
unsigned long attrs;
|
|
int nlsize;
|
|
|
|
nlsize = nla_total_size(4); /* action */
|
|
|
|
attrs = slwt->desc->attrs | slwt->parsed_optattrs;
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_SRH))
|
|
nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_TABLE))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH4))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_NH6))
|
|
nlsize += nla_total_size(16);
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_IIF))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_OIF))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_BPF))
|
|
nlsize += nla_total_size(sizeof(struct nlattr)) +
|
|
nla_total_size(MAX_PROG_NAME) +
|
|
nla_total_size(4);
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_VRFTABLE))
|
|
nlsize += nla_total_size(4);
|
|
|
|
if (attrs & SEG6_F_LOCAL_COUNTERS)
|
|
nlsize += nla_total_size(0) + /* nest SEG6_LOCAL_COUNTERS */
|
|
/* SEG6_LOCAL_CNT_PACKETS */
|
|
nla_total_size_64bit(sizeof(__u64)) +
|
|
/* SEG6_LOCAL_CNT_BYTES */
|
|
nla_total_size_64bit(sizeof(__u64)) +
|
|
/* SEG6_LOCAL_CNT_ERRORS */
|
|
nla_total_size_64bit(sizeof(__u64));
|
|
|
|
if (attrs & SEG6_F_ATTR(SEG6_LOCAL_FLAVORS))
|
|
nlsize += encap_size_flavors(slwt);
|
|
|
|
return nlsize;
|
|
}
|
|
|
|
static int seg6_local_cmp_encap(struct lwtunnel_state *a,
|
|
struct lwtunnel_state *b)
|
|
{
|
|
struct seg6_local_lwt *slwt_a, *slwt_b;
|
|
struct seg6_action_param *param;
|
|
unsigned long attrs_a, attrs_b;
|
|
int i;
|
|
|
|
slwt_a = seg6_local_lwtunnel(a);
|
|
slwt_b = seg6_local_lwtunnel(b);
|
|
|
|
if (slwt_a->action != slwt_b->action)
|
|
return 1;
|
|
|
|
attrs_a = slwt_a->desc->attrs | slwt_a->parsed_optattrs;
|
|
attrs_b = slwt_b->desc->attrs | slwt_b->parsed_optattrs;
|
|
|
|
if (attrs_a != attrs_b)
|
|
return 1;
|
|
|
|
for (i = SEG6_LOCAL_SRH; i < SEG6_LOCAL_MAX + 1; i++) {
|
|
if (attrs_a & SEG6_F_ATTR(i)) {
|
|
param = &seg6_action_params[i];
|
|
if (param->cmp(slwt_a, slwt_b))
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct lwtunnel_encap_ops seg6_local_ops = {
|
|
.build_state = seg6_local_build_state,
|
|
.destroy_state = seg6_local_destroy_state,
|
|
.input = seg6_local_input,
|
|
.fill_encap = seg6_local_fill_encap,
|
|
.get_encap_size = seg6_local_get_encap_size,
|
|
.cmp_encap = seg6_local_cmp_encap,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int __init seg6_local_init(void)
|
|
{
|
|
/* If the max total number of defined attributes is reached, then your
|
|
* kernel build stops here.
|
|
*
|
|
* This check is required to avoid arithmetic overflows when processing
|
|
* behavior attributes and the maximum number of defined attributes
|
|
* exceeds the allowed value.
|
|
*/
|
|
BUILD_BUG_ON(SEG6_LOCAL_MAX + 1 > BITS_PER_TYPE(unsigned long));
|
|
|
|
/* Check whether the number of defined flavors exceeds the maximum
|
|
* allowed value.
|
|
*/
|
|
BUILD_BUG_ON(SEG6_LOCAL_FLV_OP_MAX + 1 > BITS_PER_TYPE(__u32));
|
|
|
|
/* If the default NEXT-C-SID Locator-Block/Node Function lengths (in
|
|
* bits) have been changed with invalid values, kernel build stops
|
|
* here.
|
|
*/
|
|
BUILD_BUG_ON(next_csid_chk_cntr_bits(SEG6_LOCAL_LCBLOCK_DBITS,
|
|
SEG6_LOCAL_LCNODE_FN_DBITS));
|
|
BUILD_BUG_ON(next_csid_chk_lcblock_bits(SEG6_LOCAL_LCBLOCK_DBITS));
|
|
BUILD_BUG_ON(next_csid_chk_lcnode_fn_bits(SEG6_LOCAL_LCNODE_FN_DBITS));
|
|
|
|
/* To be memory efficient, we use 'u8' to represent the different
|
|
* actions related to RFC8986 flavors. If the kernel build stops here,
|
|
* it means that it is not possible to correctly encode these actions
|
|
* with the data type chosen for the action table.
|
|
*/
|
|
BUILD_BUG_ON(SEG6_LOCAL_FLV_ACT_MAX > (typeof(flv8986_act_tbl[0]))~0U);
|
|
|
|
return lwtunnel_encap_add_ops(&seg6_local_ops,
|
|
LWTUNNEL_ENCAP_SEG6_LOCAL);
|
|
}
|
|
|
|
void seg6_local_exit(void)
|
|
{
|
|
lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
|
|
}
|