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9ee11f0fff
Implement support for processing the IOAM Pre-allocated Trace with IPv6, see [1] and [2]. Introduce a new IPv6 Hop-by-Hop TLV option, see IANA [3]. A new per-interface sysctl is introduced. The value is a boolean to accept (=1) or ignore (=0, by default) IPv6 IOAM options on ingress for an interface: - net.ipv6.conf.XXX.ioam6_enabled Two other sysctls are introduced to define IOAM IDs, represented by an integer. They are respectively per-namespace and per-interface: - net.ipv6.ioam6_id - net.ipv6.conf.XXX.ioam6_id The value of the first one represents the IOAM ID of the node itself (u32; max and default value = U32_MAX>>8, due to hop limit concatenation) while the other represents the IOAM ID of an interface (u16; max and default value = U16_MAX). Each "ioam6_id" sysctl has a "_wide" equivalent: - net.ipv6.ioam6_id_wide - net.ipv6.conf.XXX.ioam6_id_wide The value of the first one represents the wide IOAM ID of the node itself (u64; max and default value = U64_MAX>>8, due to hop limit concatenation) while the other represents the wide IOAM ID of an interface (u32; max and default value = U32_MAX). The use of short and wide equivalents is not exclusive, a deployment could choose to leverage both. For example, net.ipv6.conf.XXX.ioam6_id (short format) could be an identifier for a physical interface, whereas net.ipv6.conf.XXX.ioam6_id_wide (wide format) could be an identifier for a logical sub-interface. Documentation about new sysctls is provided at the end of this patchset. Two relativistic hash tables are used: one for IOAM namespaces, the other for IOAM schemas. A namespace can only have a single active schema and a schema can only be attached to a single namespace (1:1 relationship). [1] https://tools.ietf.org/html/draft-ietf-ippm-ioam-ipv6-options [2] https://tools.ietf.org/html/draft-ietf-ippm-ioam-data [3] https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml#ipv6-parameters-2 Signed-off-by: Justin Iurman <justin.iurman@uliege.be> Signed-off-by: David S. Miller <davem@davemloft.net>
359 lines
8.8 KiB
C
359 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* sysctl_net_ipv6.c: sysctl interface to net IPV6 subsystem.
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*
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* Changes:
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* YOSHIFUJI Hideaki @USAGI: added icmp sysctl table.
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*/
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#include <linux/mm.h>
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#include <linux/sysctl.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/ndisc.h>
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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#include <net/inet_frag.h>
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#include <net/netevent.h>
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#include <net/ip_fib.h>
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#ifdef CONFIG_NETLABEL
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#include <net/calipso.h>
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#endif
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#include <linux/ioam6.h>
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static int two = 2;
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static int three = 3;
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static int flowlabel_reflect_max = 0x7;
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static int auto_flowlabels_max = IP6_AUTO_FLOW_LABEL_MAX;
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static u32 rt6_multipath_hash_fields_all_mask =
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FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
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static u32 ioam6_id_max = IOAM6_DEFAULT_ID;
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static u64 ioam6_id_wide_max = IOAM6_DEFAULT_ID_WIDE;
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static int proc_rt6_multipath_hash_policy(struct ctl_table *table, int write,
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void *buffer, size_t *lenp, loff_t *ppos)
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{
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struct net *net;
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int ret;
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net = container_of(table->data, struct net,
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ipv6.sysctl.multipath_hash_policy);
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ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
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if (write && ret == 0)
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call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
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return ret;
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}
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static int
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proc_rt6_multipath_hash_fields(struct ctl_table *table, int write, void *buffer,
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size_t *lenp, loff_t *ppos)
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{
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struct net *net;
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int ret;
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net = container_of(table->data, struct net,
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ipv6.sysctl.multipath_hash_fields);
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ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
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if (write && ret == 0)
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call_netevent_notifiers(NETEVENT_IPV6_MPATH_HASH_UPDATE, net);
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return ret;
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}
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static struct ctl_table ipv6_table_template[] = {
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{
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.procname = "bindv6only",
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.data = &init_net.ipv6.sysctl.bindv6only,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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},
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{
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.procname = "anycast_src_echo_reply",
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.data = &init_net.ipv6.sysctl.anycast_src_echo_reply,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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},
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{
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.procname = "flowlabel_consistency",
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.data = &init_net.ipv6.sysctl.flowlabel_consistency,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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},
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{
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.procname = "auto_flowlabels",
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.data = &init_net.ipv6.sysctl.auto_flowlabels,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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.extra2 = &auto_flowlabels_max
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},
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{
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.procname = "fwmark_reflect",
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.data = &init_net.ipv6.sysctl.fwmark_reflect,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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},
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{
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.procname = "idgen_retries",
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.data = &init_net.ipv6.sysctl.idgen_retries,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "idgen_delay",
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.data = &init_net.ipv6.sysctl.idgen_delay,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_jiffies,
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},
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{
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.procname = "flowlabel_state_ranges",
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.data = &init_net.ipv6.sysctl.flowlabel_state_ranges,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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},
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{
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.procname = "ip_nonlocal_bind",
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.data = &init_net.ipv6.sysctl.ip_nonlocal_bind,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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},
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{
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.procname = "flowlabel_reflect",
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.data = &init_net.ipv6.sysctl.flowlabel_reflect,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = &flowlabel_reflect_max,
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},
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{
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.procname = "max_dst_opts_number",
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.data = &init_net.ipv6.sysctl.max_dst_opts_cnt,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "max_hbh_opts_number",
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.data = &init_net.ipv6.sysctl.max_hbh_opts_cnt,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "max_dst_opts_length",
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.data = &init_net.ipv6.sysctl.max_dst_opts_len,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "max_hbh_length",
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.data = &init_net.ipv6.sysctl.max_hbh_opts_len,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "fib_multipath_hash_policy",
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.data = &init_net.ipv6.sysctl.multipath_hash_policy,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_rt6_multipath_hash_policy,
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.extra1 = SYSCTL_ZERO,
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.extra2 = &three,
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},
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{
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.procname = "fib_multipath_hash_fields",
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.data = &init_net.ipv6.sysctl.multipath_hash_fields,
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.maxlen = sizeof(u32),
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.mode = 0644,
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.proc_handler = proc_rt6_multipath_hash_fields,
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.extra1 = SYSCTL_ONE,
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.extra2 = &rt6_multipath_hash_fields_all_mask,
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},
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{
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.procname = "seg6_flowlabel",
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.data = &init_net.ipv6.sysctl.seg6_flowlabel,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "fib_notify_on_flag_change",
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.data = &init_net.ipv6.sysctl.fib_notify_on_flag_change,
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.maxlen = sizeof(u8),
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.mode = 0644,
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.proc_handler = proc_dou8vec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = &two,
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},
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{
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.procname = "ioam6_id",
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.data = &init_net.ipv6.sysctl.ioam6_id,
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.maxlen = sizeof(u32),
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.mode = 0644,
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.proc_handler = proc_douintvec_minmax,
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.extra2 = &ioam6_id_max,
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},
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{
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.procname = "ioam6_id_wide",
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.data = &init_net.ipv6.sysctl.ioam6_id_wide,
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.maxlen = sizeof(u64),
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.mode = 0644,
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.proc_handler = proc_doulongvec_minmax,
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.extra2 = &ioam6_id_wide_max,
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},
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{ }
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};
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static struct ctl_table ipv6_rotable[] = {
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{
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.procname = "mld_max_msf",
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.data = &sysctl_mld_max_msf,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec
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},
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{
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.procname = "mld_qrv",
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.data = &sysctl_mld_qrv,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ONE
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},
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#ifdef CONFIG_NETLABEL
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{
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.procname = "calipso_cache_enable",
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.data = &calipso_cache_enabled,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "calipso_cache_bucket_size",
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.data = &calipso_cache_bucketsize,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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#endif /* CONFIG_NETLABEL */
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{ }
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};
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static int __net_init ipv6_sysctl_net_init(struct net *net)
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{
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struct ctl_table *ipv6_table;
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struct ctl_table *ipv6_route_table;
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struct ctl_table *ipv6_icmp_table;
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int err, i;
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err = -ENOMEM;
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ipv6_table = kmemdup(ipv6_table_template, sizeof(ipv6_table_template),
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GFP_KERNEL);
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if (!ipv6_table)
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goto out;
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/* Update the variables to point into the current struct net */
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for (i = 0; i < ARRAY_SIZE(ipv6_table_template) - 1; i++)
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ipv6_table[i].data += (void *)net - (void *)&init_net;
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ipv6_route_table = ipv6_route_sysctl_init(net);
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if (!ipv6_route_table)
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goto out_ipv6_table;
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ipv6_icmp_table = ipv6_icmp_sysctl_init(net);
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if (!ipv6_icmp_table)
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goto out_ipv6_route_table;
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net->ipv6.sysctl.hdr = register_net_sysctl(net, "net/ipv6", ipv6_table);
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if (!net->ipv6.sysctl.hdr)
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goto out_ipv6_icmp_table;
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net->ipv6.sysctl.route_hdr =
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register_net_sysctl(net, "net/ipv6/route", ipv6_route_table);
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if (!net->ipv6.sysctl.route_hdr)
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goto out_unregister_ipv6_table;
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net->ipv6.sysctl.icmp_hdr =
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register_net_sysctl(net, "net/ipv6/icmp", ipv6_icmp_table);
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if (!net->ipv6.sysctl.icmp_hdr)
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goto out_unregister_route_table;
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err = 0;
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out:
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return err;
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out_unregister_route_table:
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unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
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out_unregister_ipv6_table:
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unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
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out_ipv6_icmp_table:
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kfree(ipv6_icmp_table);
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out_ipv6_route_table:
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kfree(ipv6_route_table);
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out_ipv6_table:
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kfree(ipv6_table);
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goto out;
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}
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static void __net_exit ipv6_sysctl_net_exit(struct net *net)
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{
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struct ctl_table *ipv6_table;
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struct ctl_table *ipv6_route_table;
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struct ctl_table *ipv6_icmp_table;
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ipv6_table = net->ipv6.sysctl.hdr->ctl_table_arg;
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ipv6_route_table = net->ipv6.sysctl.route_hdr->ctl_table_arg;
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ipv6_icmp_table = net->ipv6.sysctl.icmp_hdr->ctl_table_arg;
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unregister_net_sysctl_table(net->ipv6.sysctl.icmp_hdr);
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unregister_net_sysctl_table(net->ipv6.sysctl.route_hdr);
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unregister_net_sysctl_table(net->ipv6.sysctl.hdr);
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kfree(ipv6_table);
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kfree(ipv6_route_table);
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kfree(ipv6_icmp_table);
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}
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static struct pernet_operations ipv6_sysctl_net_ops = {
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.init = ipv6_sysctl_net_init,
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.exit = ipv6_sysctl_net_exit,
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};
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static struct ctl_table_header *ip6_header;
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int ipv6_sysctl_register(void)
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{
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int err = -ENOMEM;
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ip6_header = register_net_sysctl(&init_net, "net/ipv6", ipv6_rotable);
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if (!ip6_header)
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goto out;
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err = register_pernet_subsys(&ipv6_sysctl_net_ops);
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if (err)
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goto err_pernet;
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out:
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return err;
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err_pernet:
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unregister_net_sysctl_table(ip6_header);
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goto out;
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}
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void ipv6_sysctl_unregister(void)
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{
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unregister_net_sysctl_table(ip6_header);
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unregister_pernet_subsys(&ipv6_sysctl_net_ops);
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}
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