35103d1117
Like the ipv4 patch with a similar title, this adds a sysctl to allow the user to change routing behavior based on whether or not the interface associated with the nexthop was an up or down link. The default setting preserves the current behavior, but anyone that enables it will notice that nexthops on down interfaces will no longer be selected: net.ipv6.conf.all.ignore_routes_with_linkdown = 0 net.ipv6.conf.default.ignore_routes_with_linkdown = 0 net.ipv6.conf.lo.ignore_routes_with_linkdown = 0 ... When the above sysctls are set, not only will link status be reported to userspace, but an indication that a nexthop is dead and will not be used is also reported. 1000::/8 via 7000::2 dev p7p1 metric 1024 dead linkdown pref medium 1000::/8 via 8000::2 dev p8p1 metric 1024 pref medium 7000::/8 dev p7p1 proto kernel metric 256 dead linkdown pref medium 8000::/8 dev p8p1 proto kernel metric 256 pref medium 9000::/8 via 8000::2 dev p8p1 metric 2048 pref medium 9000::/8 via 7000::2 dev p7p1 metric 1024 dead linkdown pref medium fe80::/64 dev p7p1 proto kernel metric 256 dead linkdown pref medium fe80::/64 dev p8p1 proto kernel metric 256 pref medium This also adds devconf support and notification when sysctl values change. v2: drop use of rt6i_nhflags since it is not needed right now Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com> Signed-off-by: Dinesh Dutt <ddutt@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
181 lines
3.5 KiB
C
181 lines
3.5 KiB
C
#ifndef _UAPI_IPV6_H
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#define _UAPI_IPV6_H
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#include <linux/libc-compat.h>
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#include <linux/types.h>
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#include <linux/in6.h>
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#include <asm/byteorder.h>
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/* The latest drafts declared increase in minimal mtu up to 1280. */
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#define IPV6_MIN_MTU 1280
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/*
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* Advanced API
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* source interface/address selection, source routing, etc...
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* *under construction*
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*/
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#if __UAPI_DEF_IN6_PKTINFO
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struct in6_pktinfo {
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struct in6_addr ipi6_addr;
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int ipi6_ifindex;
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};
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#endif
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#if __UAPI_DEF_IP6_MTUINFO
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struct ip6_mtuinfo {
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struct sockaddr_in6 ip6m_addr;
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__u32 ip6m_mtu;
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};
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#endif
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struct in6_ifreq {
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struct in6_addr ifr6_addr;
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__u32 ifr6_prefixlen;
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int ifr6_ifindex;
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};
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#define IPV6_SRCRT_STRICT 0x01 /* Deprecated; will be removed */
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#define IPV6_SRCRT_TYPE_0 0 /* Deprecated; will be removed */
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#define IPV6_SRCRT_TYPE_2 2 /* IPv6 type 2 Routing Header */
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/*
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* routing header
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*/
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struct ipv6_rt_hdr {
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__u8 nexthdr;
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__u8 hdrlen;
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__u8 type;
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__u8 segments_left;
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/*
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* type specific data
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* variable length field
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*/
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};
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struct ipv6_opt_hdr {
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__u8 nexthdr;
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__u8 hdrlen;
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/*
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* TLV encoded option data follows.
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*/
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} __attribute__((packed)); /* required for some archs */
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#define ipv6_destopt_hdr ipv6_opt_hdr
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#define ipv6_hopopt_hdr ipv6_opt_hdr
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/* Router Alert option values (RFC2711) */
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#define IPV6_OPT_ROUTERALERT_MLD 0x0000 /* MLD(RFC2710) */
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/*
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* routing header type 0 (used in cmsghdr struct)
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*/
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struct rt0_hdr {
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struct ipv6_rt_hdr rt_hdr;
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__u32 reserved;
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struct in6_addr addr[0];
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#define rt0_type rt_hdr.type
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};
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/*
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* routing header type 2
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*/
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struct rt2_hdr {
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struct ipv6_rt_hdr rt_hdr;
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__u32 reserved;
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struct in6_addr addr;
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#define rt2_type rt_hdr.type
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};
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/*
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* home address option in destination options header
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*/
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struct ipv6_destopt_hao {
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__u8 type;
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__u8 length;
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struct in6_addr addr;
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} __attribute__((packed));
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/*
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* IPv6 fixed header
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*
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* BEWARE, it is incorrect. The first 4 bits of flow_lbl
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* are glued to priority now, forming "class".
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*/
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struct ipv6hdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 priority:4,
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version:4;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 version:4,
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priority:4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 flow_lbl[3];
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__be16 payload_len;
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__u8 nexthdr;
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__u8 hop_limit;
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struct in6_addr saddr;
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struct in6_addr daddr;
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};
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/* index values for the variables in ipv6_devconf */
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enum {
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DEVCONF_FORWARDING = 0,
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DEVCONF_HOPLIMIT,
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DEVCONF_MTU6,
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DEVCONF_ACCEPT_RA,
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DEVCONF_ACCEPT_REDIRECTS,
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DEVCONF_AUTOCONF,
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DEVCONF_DAD_TRANSMITS,
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DEVCONF_RTR_SOLICITS,
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DEVCONF_RTR_SOLICIT_INTERVAL,
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DEVCONF_RTR_SOLICIT_DELAY,
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DEVCONF_USE_TEMPADDR,
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DEVCONF_TEMP_VALID_LFT,
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DEVCONF_TEMP_PREFERED_LFT,
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DEVCONF_REGEN_MAX_RETRY,
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DEVCONF_MAX_DESYNC_FACTOR,
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DEVCONF_MAX_ADDRESSES,
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DEVCONF_FORCE_MLD_VERSION,
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DEVCONF_ACCEPT_RA_DEFRTR,
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DEVCONF_ACCEPT_RA_PINFO,
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DEVCONF_ACCEPT_RA_RTR_PREF,
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DEVCONF_RTR_PROBE_INTERVAL,
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DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN,
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DEVCONF_PROXY_NDP,
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DEVCONF_OPTIMISTIC_DAD,
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DEVCONF_ACCEPT_SOURCE_ROUTE,
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DEVCONF_MC_FORWARDING,
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DEVCONF_DISABLE_IPV6,
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DEVCONF_ACCEPT_DAD,
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DEVCONF_FORCE_TLLAO,
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DEVCONF_NDISC_NOTIFY,
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DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL,
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DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL,
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DEVCONF_SUPPRESS_FRAG_NDISC,
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DEVCONF_ACCEPT_RA_FROM_LOCAL,
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DEVCONF_USE_OPTIMISTIC,
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DEVCONF_ACCEPT_RA_MTU,
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DEVCONF_STABLE_SECRET,
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DEVCONF_USE_OIF_ADDRS_ONLY,
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DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT,
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DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
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DEVCONF_MAX
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};
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#endif /* _UAPI_IPV6_H */
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