// SPDX-License-Identifier: GPL-2.0-or-later /* * Neighbour Discovery for IPv6 * Linux INET6 implementation * * Authors: * Pedro Roque <roque@di.fc.ul.pt> * Mike Shaver <shaver@ingenia.com> */ /* * Changes: * * Alexey I. Froloff : RFC6106 (DNSSL) support * Pierre Ynard : export userland ND options * through netlink (RDNSS support) * Lars Fenneberg : fixed MTU setting on receipt * of an RA. * Janos Farkas : kmalloc failure checks * Alexey Kuznetsov : state machine reworked * and moved to net/core. * Pekka Savola : RFC2461 validation * YOSHIFUJI Hideaki @USAGI : Verify ND options properly */ #define pr_fmt(fmt) "ICMPv6: " fmt #include <linux/module.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/sockios.h> #include <linux/sched.h> #include <linux/net.h> #include <linux/in6.h> #include <linux/route.h> #include <linux/init.h> #include <linux/rcupdate.h> #include <linux/slab.h> #ifdef CONFIG_SYSCTL #include <linux/sysctl.h> #endif #include <linux/if_addr.h> #include <linux/if_ether.h> #include <linux/if_arp.h> #include <linux/ipv6.h> #include <linux/icmpv6.h> #include <linux/jhash.h> #include <net/sock.h> #include <net/snmp.h> #include <net/ipv6.h> #include <net/protocol.h> #include <net/ndisc.h> #include <net/ip6_route.h> #include <net/addrconf.h> #include <net/icmp.h> #include <net/netlink.h> #include <linux/rtnetlink.h> #include <net/flow.h> #include <net/ip6_checksum.h> #include <net/inet_common.h> #include <linux/proc_fs.h> #include <linux/netfilter.h> #include <linux/netfilter_ipv6.h> static u32 ndisc_hash(const void *pkey, <------><------> const struct net_device *dev, <------><------> __u32 *hash_rnd); static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); static bool ndisc_allow_add(const struct net_device *dev, <------><------><------> struct netlink_ext_ack *extack); static int ndisc_constructor(struct neighbour *neigh); static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); static int pndisc_constructor(struct pneigh_entry *n); static void pndisc_destructor(struct pneigh_entry *n); static void pndisc_redo(struct sk_buff *skb); static int ndisc_is_multicast(const void *pkey); static const struct neigh_ops ndisc_generic_ops = { <------>.family = AF_INET6, <------>.solicit = ndisc_solicit, <------>.error_report = ndisc_error_report, <------>.output = neigh_resolve_output, <------>.connected_output = neigh_connected_output, }; static const struct neigh_ops ndisc_hh_ops = { <------>.family = AF_INET6, <------>.solicit = ndisc_solicit, <------>.error_report = ndisc_error_report, <------>.output = neigh_resolve_output, <------>.connected_output = neigh_resolve_output, }; static const struct neigh_ops ndisc_direct_ops = { <------>.family = AF_INET6, <------>.output = neigh_direct_output, <------>.connected_output = neigh_direct_output, }; struct neigh_table nd_tbl = { <------>.family = AF_INET6, <------>.key_len = sizeof(struct in6_addr), <------>.protocol = cpu_to_be16(ETH_P_IPV6), <------>.hash = ndisc_hash, <------>.key_eq = ndisc_key_eq, <------>.constructor = ndisc_constructor, <------>.pconstructor = pndisc_constructor, <------>.pdestructor = pndisc_destructor, <------>.proxy_redo = pndisc_redo, <------>.is_multicast = ndisc_is_multicast, <------>.allow_add = ndisc_allow_add, <------>.id = "ndisc_cache", <------>.parms = { <------><------>.tbl = &nd_tbl, <------><------>.reachable_time = ND_REACHABLE_TIME, <------><------>.data = { <------><------><------>[NEIGH_VAR_MCAST_PROBES] = 3, <------><------><------>[NEIGH_VAR_UCAST_PROBES] = 3, <------><------><------>[NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, <------><------><------>[NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, <------><------><------>[NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, <------><------><------>[NEIGH_VAR_GC_STALETIME] = 60 * HZ, <------><------><------>[NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, <------><------><------>[NEIGH_VAR_PROXY_QLEN] = 64, <------><------><------>[NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, <------><------><------>[NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, <------><------>}, <------>}, <------>.gc_interval = 30 * HZ, <------>.gc_thresh1 = 128, <------>.gc_thresh2 = 512, <------>.gc_thresh3 = 1024, }; EXPORT_SYMBOL_GPL(nd_tbl); void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data, <------><------><------> int data_len, int pad) { <------>int space = __ndisc_opt_addr_space(data_len, pad); <------>u8 *opt = skb_put(skb, space); <------>opt[0] = type; <------>opt[1] = space>>3; <------>memset(opt + 2, 0, pad); <------>opt += pad; <------>space -= pad; <------>memcpy(opt+2, data, data_len); <------>data_len += 2; <------>opt += data_len; <------>space -= data_len; <------>if (space > 0) <------><------>memset(opt, 0, space); } EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option); static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type, <------><------><------><------><------> void *data, u8 icmp6_type) { <------>__ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len, <------><------><------><------> ndisc_addr_option_pad(skb->dev->type)); <------>ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type); } static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb, <------><------><------><------><------><------> void *ha, <------><------><------><------><------><------> const u8 *ops_data) { <------>ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT); <------>ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data); } static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, <------><------><------><------><------> struct nd_opt_hdr *end) { <------>int type; <------>if (!cur || !end || cur >= end) <------><------>return NULL; <------>type = cur->nd_opt_type; <------>do { <------><------>cur = ((void *)cur) + (cur->nd_opt_len << 3); <------>} while (cur < end && cur->nd_opt_type != type); <------>return cur <= end && cur->nd_opt_type == type ? cur : NULL; } static inline int ndisc_is_useropt(const struct net_device *dev, <------><------><------><------> struct nd_opt_hdr *opt) { <------>return opt->nd_opt_type == ND_OPT_RDNSS || <------><------>opt->nd_opt_type == ND_OPT_DNSSL || <------><------>opt->nd_opt_type == ND_OPT_CAPTIVE_PORTAL || <------><------>opt->nd_opt_type == ND_OPT_PREF64 || <------><------>ndisc_ops_is_useropt(dev, opt->nd_opt_type); } static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev, <------><------><------><------><------> struct nd_opt_hdr *cur, <------><------><------><------><------> struct nd_opt_hdr *end) { <------>if (!cur || !end || cur >= end) <------><------>return NULL; <------>do { <------><------>cur = ((void *)cur) + (cur->nd_opt_len << 3); <------>} while (cur < end && !ndisc_is_useropt(dev, cur)); <------>return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL; } struct ndisc_options *ndisc_parse_options(const struct net_device *dev, <------><------><------><------><------> u8 *opt, int opt_len, <------><------><------><------><------> struct ndisc_options *ndopts) { <------>struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; <------>if (!nd_opt || opt_len < 0 || !ndopts) <------><------>return NULL; <------>memset(ndopts, 0, sizeof(*ndopts)); <------>while (opt_len) { <------><------>int l; <------><------>if (opt_len < sizeof(struct nd_opt_hdr)) <------><------><------>return NULL; <------><------>l = nd_opt->nd_opt_len << 3; <------><------>if (opt_len < l || l == 0) <------><------><------>return NULL; <------><------>if (ndisc_ops_parse_options(dev, nd_opt, ndopts)) <------><------><------>goto next_opt; <------><------>switch (nd_opt->nd_opt_type) { <------><------>case ND_OPT_SOURCE_LL_ADDR: <------><------>case ND_OPT_TARGET_LL_ADDR: <------><------>case ND_OPT_MTU: <------><------>case ND_OPT_NONCE: <------><------>case ND_OPT_REDIRECT_HDR: <------><------><------>if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { <------><------><------><------>ND_PRINTK(2, warn, <------><------><------><------><------> "%s: duplicated ND6 option found: type=%d\n", <------><------><------><------><------> __func__, nd_opt->nd_opt_type); <------><------><------>} else { <------><------><------><------>ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; <------><------><------>} <------><------><------>break; <------><------>case ND_OPT_PREFIX_INFO: <------><------><------>ndopts->nd_opts_pi_end = nd_opt; <------><------><------>if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) <------><------><------><------>ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; <------><------><------>break; #ifdef CONFIG_IPV6_ROUTE_INFO <------><------>case ND_OPT_ROUTE_INFO: <------><------><------>ndopts->nd_opts_ri_end = nd_opt; <------><------><------>if (!ndopts->nd_opts_ri) <------><------><------><------>ndopts->nd_opts_ri = nd_opt; <------><------><------>break; #endif <------><------>default: <------><------><------>if (ndisc_is_useropt(dev, nd_opt)) { <------><------><------><------>ndopts->nd_useropts_end = nd_opt; <------><------><------><------>if (!ndopts->nd_useropts) <------><------><------><------><------>ndopts->nd_useropts = nd_opt; <------><------><------>} else { <------><------><------><------>/* <------><------><------><------> * Unknown options must be silently ignored, <------><------><------><------> * to accommodate future extension to the <------><------><------><------> * protocol. <------><------><------><------> */ <------><------><------><------>ND_PRINTK(2, notice, <------><------><------><------><------> "%s: ignored unsupported option; type=%d, len=%d\n", <------><------><------><------><------> __func__, <------><------><------><------><------> nd_opt->nd_opt_type, <------><------><------><------><------> nd_opt->nd_opt_len); <------><------><------>} <------><------>} next_opt: <------><------>opt_len -= l; <------><------>nd_opt = ((void *)nd_opt) + l; <------>} <------>return ndopts; } int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) { <------>switch (dev->type) { <------>case ARPHRD_ETHER: <------>case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ <------>case ARPHRD_FDDI: <------><------>ipv6_eth_mc_map(addr, buf); <------><------>return 0; <------>case ARPHRD_ARCNET: <------><------>ipv6_arcnet_mc_map(addr, buf); <------><------>return 0; <------>case ARPHRD_INFINIBAND: <------><------>ipv6_ib_mc_map(addr, dev->broadcast, buf); <------><------>return 0; <------>case ARPHRD_IPGRE: <------><------>return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); <------>default: <------><------>if (dir) { <------><------><------>memcpy(buf, dev->broadcast, dev->addr_len); <------><------><------>return 0; <------><------>} <------>} <------>return -EINVAL; } EXPORT_SYMBOL(ndisc_mc_map); static u32 ndisc_hash(const void *pkey, <------><------> const struct net_device *dev, <------><------> __u32 *hash_rnd) { <------>return ndisc_hashfn(pkey, dev, hash_rnd); } static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) { <------>return neigh_key_eq128(n, pkey); } static int ndisc_constructor(struct neighbour *neigh) { <------>struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; <------>struct net_device *dev = neigh->dev; <------>struct inet6_dev *in6_dev; <------>struct neigh_parms *parms; <------>bool is_multicast = ipv6_addr_is_multicast(addr); <------>in6_dev = in6_dev_get(dev); <------>if (!in6_dev) { <------><------>return -EINVAL; <------>} <------>parms = in6_dev->nd_parms; <------>__neigh_parms_put(neigh->parms); <------>neigh->parms = neigh_parms_clone(parms); <------>neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; <------>if (!dev->header_ops) { <------><------>neigh->nud_state = NUD_NOARP; <------><------>neigh->ops = &ndisc_direct_ops; <------><------>neigh->output = neigh_direct_output; <------>} else { <------><------>if (is_multicast) { <------><------><------>neigh->nud_state = NUD_NOARP; <------><------><------>ndisc_mc_map(addr, neigh->ha, dev, 1); <------><------>} else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { <------><------><------>neigh->nud_state = NUD_NOARP; <------><------><------>memcpy(neigh->ha, dev->dev_addr, dev->addr_len); <------><------><------>if (dev->flags&IFF_LOOPBACK) <------><------><------><------>neigh->type = RTN_LOCAL; <------><------>} else if (dev->flags&IFF_POINTOPOINT) { <------><------><------>neigh->nud_state = NUD_NOARP; <------><------><------>memcpy(neigh->ha, dev->broadcast, dev->addr_len); <------><------>} <------><------>if (dev->header_ops->cache) <------><------><------>neigh->ops = &ndisc_hh_ops; <------><------>else <------><------><------>neigh->ops = &ndisc_generic_ops; <------><------>if (neigh->nud_state&NUD_VALID) <------><------><------>neigh->output = neigh->ops->connected_output; <------><------>else <------><------><------>neigh->output = neigh->ops->output; <------>} <------>in6_dev_put(in6_dev); <------>return 0; } static int pndisc_constructor(struct pneigh_entry *n) { <------>struct in6_addr *addr = (struct in6_addr *)&n->key; <------>struct in6_addr maddr; <------>struct net_device *dev = n->dev; <------>if (!dev || !__in6_dev_get(dev)) <------><------>return -EINVAL; <------>addrconf_addr_solict_mult(addr, &maddr); <------>ipv6_dev_mc_inc(dev, &maddr); <------>return 0; } static void pndisc_destructor(struct pneigh_entry *n) { <------>struct in6_addr *addr = (struct in6_addr *)&n->key; <------>struct in6_addr maddr; <------>struct net_device *dev = n->dev; <------>if (!dev || !__in6_dev_get(dev)) <------><------>return; <------>addrconf_addr_solict_mult(addr, &maddr); <------>ipv6_dev_mc_dec(dev, &maddr); } /* called with rtnl held */ static bool ndisc_allow_add(const struct net_device *dev, <------><------><------> struct netlink_ext_ack *extack) { <------>struct inet6_dev *idev = __in6_dev_get(dev); <------>if (!idev || idev->cnf.disable_ipv6) { <------><------>NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device"); <------><------>return false; <------>} <------>return true; } static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, <------><------><------><------> int len) { <------>int hlen = LL_RESERVED_SPACE(dev); <------>int tlen = dev->needed_tailroom; <------>struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; <------>struct sk_buff *skb; <------>skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); <------>if (!skb) { <------><------>ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", <------><------><------> __func__); <------><------>return NULL; <------>} <------>skb->protocol = htons(ETH_P_IPV6); <------>skb->dev = dev; <------>skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); <------>skb_reset_transport_header(skb); <------>/* Manually assign socket ownership as we avoid calling <------> * sock_alloc_send_pskb() to bypass wmem buffer limits <------> */ <------>skb_set_owner_w(skb, sk); <------>return skb; } static void ip6_nd_hdr(struct sk_buff *skb, <------><------> const struct in6_addr *saddr, <------><------> const struct in6_addr *daddr, <------><------> int hop_limit, int len) { <------>struct ipv6hdr *hdr; <------>struct inet6_dev *idev; <------>unsigned tclass; <------>rcu_read_lock(); <------>idev = __in6_dev_get(skb->dev); <------>tclass = idev ? idev->cnf.ndisc_tclass : 0; <------>rcu_read_unlock(); <------>skb_push(skb, sizeof(*hdr)); <------>skb_reset_network_header(skb); <------>hdr = ipv6_hdr(skb); <------>ip6_flow_hdr(hdr, tclass, 0); <------>hdr->payload_len = htons(len); <------>hdr->nexthdr = IPPROTO_ICMPV6; <------>hdr->hop_limit = hop_limit; <------>hdr->saddr = *saddr; <------>hdr->daddr = *daddr; } static void ndisc_send_skb(struct sk_buff *skb, <------><------><------> const struct in6_addr *daddr, <------><------><------> const struct in6_addr *saddr) { <------>struct dst_entry *dst = skb_dst(skb); <------>struct net *net = dev_net(skb->dev); <------>struct sock *sk = net->ipv6.ndisc_sk; <------>struct inet6_dev *idev; <------>int err; <------>struct icmp6hdr *icmp6h = icmp6_hdr(skb); <------>u8 type; <------>type = icmp6h->icmp6_type; <------>if (!dst) { <------><------>struct flowi6 fl6; <------><------>int oif = skb->dev->ifindex; <------><------>icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif); <------><------>dst = icmp6_dst_alloc(skb->dev, &fl6); <------><------>if (IS_ERR(dst)) { <------><------><------>kfree_skb(skb); <------><------><------>return; <------><------>} <------><------>skb_dst_set(skb, dst); <------>} <------>icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, <------><------><------><------><------> IPPROTO_ICMPV6, <------><------><------><------><------> csum_partial(icmp6h, <------><------><------><------><------><------><------> skb->len, 0)); <------>ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); <------>rcu_read_lock(); <------>idev = __in6_dev_get(dst->dev); <------>IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); <------>err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, <------><------> net, sk, skb, NULL, dst->dev, <------><------> dst_output); <------>if (!err) { <------><------>ICMP6MSGOUT_INC_STATS(net, idev, type); <------><------>ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); <------>} <------>rcu_read_unlock(); } void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, <------><------> const struct in6_addr *solicited_addr, <------><------> bool router, bool solicited, bool override, bool inc_opt) { <------>struct sk_buff *skb; <------>struct in6_addr tmpaddr; <------>struct inet6_ifaddr *ifp; <------>const struct in6_addr *src_addr; <------>struct nd_msg *msg; <------>int optlen = 0; <------>/* for anycast or proxy, solicited_addr != src_addr */ <------>ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); <------>if (ifp) { <------><------>src_addr = solicited_addr; <------><------>if (ifp->flags & IFA_F_OPTIMISTIC) <------><------><------>override = false; <------><------>inc_opt |= ifp->idev->cnf.force_tllao; <------><------>in6_ifa_put(ifp); <------>} else { <------><------>if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, <------><------><------><------> inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, <------><------><------><------> &tmpaddr)) <------><------><------>return; <------><------>src_addr = &tmpaddr; <------>} <------>if (!dev->addr_len) <------><------>inc_opt = false; <------>if (inc_opt) <------><------>optlen += ndisc_opt_addr_space(dev, <------><------><------><------><------> NDISC_NEIGHBOUR_ADVERTISEMENT); <------>skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); <------>if (!skb) <------><------>return; <------>msg = skb_put(skb, sizeof(*msg)); <------>*msg = (struct nd_msg) { <------><------>.icmph = { <------><------><------>.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, <------><------><------>.icmp6_router = router, <------><------><------>.icmp6_solicited = solicited, <------><------><------>.icmp6_override = override, <------><------>}, <------><------>.target = *solicited_addr, <------>}; <------>if (inc_opt) <------><------>ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, <------><------><------><------> dev->dev_addr, <------><------><------><------> NDISC_NEIGHBOUR_ADVERTISEMENT); <------>ndisc_send_skb(skb, daddr, src_addr); } static void ndisc_send_unsol_na(struct net_device *dev) { <------>struct inet6_dev *idev; <------>struct inet6_ifaddr *ifa; <------>idev = in6_dev_get(dev); <------>if (!idev) <------><------>return; <------>read_lock_bh(&idev->lock); <------>list_for_each_entry(ifa, &idev->addr_list, if_list) { <------><------>/* skip tentative addresses until dad completes */ <------><------>if (ifa->flags & IFA_F_TENTATIVE && <------><------> !(ifa->flags & IFA_F_OPTIMISTIC)) <------><------><------>continue; <------><------>ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, <------><------><------> /*router=*/ !!idev->cnf.forwarding, <------><------><------> /*solicited=*/ false, /*override=*/ true, <------><------><------> /*inc_opt=*/ true); <------>} <------>read_unlock_bh(&idev->lock); <------>in6_dev_put(idev); } void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, <------><------> const struct in6_addr *daddr, const struct in6_addr *saddr, <------><------> u64 nonce) { <------>struct sk_buff *skb; <------>struct in6_addr addr_buf; <------>int inc_opt = dev->addr_len; <------>int optlen = 0; <------>struct nd_msg *msg; <------>if (!saddr) { <------><------>if (ipv6_get_lladdr(dev, &addr_buf, <------><------><------><------> (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) <------><------><------>return; <------><------>saddr = &addr_buf; <------>} <------>if (ipv6_addr_any(saddr)) <------><------>inc_opt = false; <------>if (inc_opt) <------><------>optlen += ndisc_opt_addr_space(dev, <------><------><------><------><------> NDISC_NEIGHBOUR_SOLICITATION); <------>if (nonce != 0) <------><------>optlen += 8; <------>skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); <------>if (!skb) <------><------>return; <------>msg = skb_put(skb, sizeof(*msg)); <------>*msg = (struct nd_msg) { <------><------>.icmph = { <------><------><------>.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, <------><------>}, <------><------>.target = *solicit, <------>}; <------>if (inc_opt) <------><------>ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, <------><------><------><------> dev->dev_addr, <------><------><------><------> NDISC_NEIGHBOUR_SOLICITATION); <------>if (nonce != 0) { <------><------>u8 *opt = skb_put(skb, 8); <------><------>opt[0] = ND_OPT_NONCE; <------><------>opt[1] = 8 >> 3; <------><------>memcpy(opt + 2, &nonce, 6); <------>} <------>ndisc_send_skb(skb, daddr, saddr); } void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, <------><------> const struct in6_addr *daddr) { <------>struct sk_buff *skb; <------>struct rs_msg *msg; <------>int send_sllao = dev->addr_len; <------>int optlen = 0; #ifdef CONFIG_IPV6_OPTIMISTIC_DAD <------>/* <------> * According to section 2.2 of RFC 4429, we must not <------> * send router solicitations with a sllao from <------> * optimistic addresses, but we may send the solicitation <------> * if we don't include the sllao. So here we check <------> * if our address is optimistic, and if so, we <------> * suppress the inclusion of the sllao. <------> */ <------>if (send_sllao) { <------><------>struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, <------><------><------><------><------><------><------> dev, 1); <------><------>if (ifp) { <------><------><------>if (ifp->flags & IFA_F_OPTIMISTIC) { <------><------><------><------>send_sllao = 0; <------><------><------>} <------><------><------>in6_ifa_put(ifp); <------><------>} else { <------><------><------>send_sllao = 0; <------><------>} <------>} #endif <------>if (send_sllao) <------><------>optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION); <------>skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); <------>if (!skb) <------><------>return; <------>msg = skb_put(skb, sizeof(*msg)); <------>*msg = (struct rs_msg) { <------><------>.icmph = { <------><------><------>.icmp6_type = NDISC_ROUTER_SOLICITATION, <------><------>}, <------>}; <------>if (send_sllao) <------><------>ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, <------><------><------><------> dev->dev_addr, <------><------><------><------> NDISC_ROUTER_SOLICITATION); <------>ndisc_send_skb(skb, daddr, saddr); } static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) { <------>/* <------> * "The sender MUST return an ICMP <------> * destination unreachable" <------> */ <------>dst_link_failure(skb); <------>kfree_skb(skb); } /* Called with locked neigh: either read or both */ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) { <------>struct in6_addr *saddr = NULL; <------>struct in6_addr mcaddr; <------>struct net_device *dev = neigh->dev; <------>struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; <------>int probes = atomic_read(&neigh->probes); <------>if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, <------><------><------><------><------> dev, false, 1, <------><------><------><------><------> IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) <------><------>saddr = &ipv6_hdr(skb)->saddr; <------>probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); <------>if (probes < 0) { <------><------>if (!(neigh->nud_state & NUD_VALID)) { <------><------><------>ND_PRINTK(1, dbg, <------><------><------><------> "%s: trying to ucast probe in NUD_INVALID: %pI6\n", <------><------><------><------> __func__, target); <------><------>} <------><------>ndisc_send_ns(dev, target, target, saddr, 0); <------>} else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { <------><------>neigh_app_ns(neigh); <------>} else { <------><------>addrconf_addr_solict_mult(target, &mcaddr); <------><------>ndisc_send_ns(dev, target, &mcaddr, saddr, 0); <------>} } static int pndisc_is_router(const void *pkey, <------><------><------> struct net_device *dev) { <------>struct pneigh_entry *n; <------>int ret = -1; <------>read_lock_bh(&nd_tbl.lock); <------>n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); <------>if (n) <------><------>ret = !!(n->flags & NTF_ROUTER); <------>read_unlock_bh(&nd_tbl.lock); <------>return ret; } void ndisc_update(const struct net_device *dev, struct neighbour *neigh, <------><------> const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, <------><------> struct ndisc_options *ndopts) { <------>neigh_update(neigh, lladdr, new, flags, 0); <------>/* report ndisc ops about neighbour update */ <------>ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts); } static void ndisc_recv_ns(struct sk_buff *skb) { <------>struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); <------>const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; <------>const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; <------>u8 *lladdr = NULL; <------>u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + <------><------><------><------> offsetof(struct nd_msg, opt)); <------>struct ndisc_options ndopts; <------>struct net_device *dev = skb->dev; <------>struct inet6_ifaddr *ifp; <------>struct inet6_dev *idev = NULL; <------>struct neighbour *neigh; <------>int dad = ipv6_addr_any(saddr); <------>bool inc; <------>int is_router = -1; <------>u64 nonce = 0; <------>if (skb->len < sizeof(struct nd_msg)) { <------><------>ND_PRINTK(2, warn, "NS: packet too short\n"); <------><------>return; <------>} <------>if (ipv6_addr_is_multicast(&msg->target)) { <------><------>ND_PRINTK(2, warn, "NS: multicast target address\n"); <------><------>return; <------>} <------>/* <------> * RFC2461 7.1.1: <------> * DAD has to be destined for solicited node multicast address. <------> */ <------>if (dad && !ipv6_addr_is_solict_mult(daddr)) { <------><------>ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); <------><------>return; <------>} <------>if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { <------><------>ND_PRINTK(2, warn, "NS: invalid ND options\n"); <------><------>return; <------>} <------>if (ndopts.nd_opts_src_lladdr) { <------><------>lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); <------><------>if (!lladdr) { <------><------><------>ND_PRINTK(2, warn, <------><------><------><------> "NS: invalid link-layer address length\n"); <------><------><------>return; <------><------>} <------><------>/* RFC2461 7.1.1: <------><------> * If the IP source address is the unspecified address, <------><------> * there MUST NOT be source link-layer address option <------><------> * in the message. <------><------> */ <------><------>if (dad) { <------><------><------>ND_PRINTK(2, warn, <------><------><------><------> "NS: bad DAD packet (link-layer address option)\n"); <------><------><------>return; <------><------>} <------>} <------>if (ndopts.nd_opts_nonce && ndopts.nd_opts_nonce->nd_opt_len == 1) <------><------>memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6); <------>inc = ipv6_addr_is_multicast(daddr); <------>ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); <------>if (ifp) { have_ifp: <------><------>if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { <------><------><------>if (dad) { <------><------><------><------>if (nonce != 0 && ifp->dad_nonce == nonce) { <------><------><------><------><------>u8 *np = (u8 *)&nonce; <------><------><------><------><------>/* Matching nonce if looped back */ <------><------><------><------><------>ND_PRINTK(2, notice, <------><------><------><------><------><------> "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n", <------><------><------><------><------><------> ifp->idev->dev->name, <------><------><------><------><------><------> &ifp->addr, np); <------><------><------><------><------>goto out; <------><------><------><------>} <------><------><------><------>/* <------><------><------><------> * We are colliding with another node <------><------><------><------> * who is doing DAD <------><------><------><------> * so fail our DAD process <------><------><------><------> */ <------><------><------><------>addrconf_dad_failure(skb, ifp); <------><------><------><------>return; <------><------><------>} else { <------><------><------><------>/* <------><------><------><------> * This is not a dad solicitation. <------><------><------><------> * If we are an optimistic node, <------><------><------><------> * we should respond. <------><------><------><------> * Otherwise, we should ignore it. <------><------><------><------> */ <------><------><------><------>if (!(ifp->flags & IFA_F_OPTIMISTIC)) <------><------><------><------><------>goto out; <------><------><------>} <------><------>} <------><------>idev = ifp->idev; <------>} else { <------><------>struct net *net = dev_net(dev); <------><------>/* perhaps an address on the master device */ <------><------>if (netif_is_l3_slave(dev)) { <------><------><------>struct net_device *mdev; <------><------><------>mdev = netdev_master_upper_dev_get_rcu(dev); <------><------><------>if (mdev) { <------><------><------><------>ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); <------><------><------><------>if (ifp) <------><------><------><------><------>goto have_ifp; <------><------><------>} <------><------>} <------><------>idev = in6_dev_get(dev); <------><------>if (!idev) { <------><------><------>/* XXX: count this drop? */ <------><------><------>return; <------><------>} <------><------>if (ipv6_chk_acast_addr(net, dev, &msg->target) || <------><------> (idev->cnf.forwarding && <------><------> (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && <------><------> (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { <------><------><------>if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && <------><------><------> skb->pkt_type != PACKET_HOST && <------><------><------> inc && <------><------><------> NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { <------><------><------><------>/* <------><------><------><------> * for anycast or proxy, <------><------><------><------> * sender should delay its response <------><------><------><------> * by a random time between 0 and <------><------><------><------> * MAX_ANYCAST_DELAY_TIME seconds. <------><------><------><------> * (RFC2461) -- yoshfuji <------><------><------><------> */ <------><------><------><------>struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); <------><------><------><------>if (n) <------><------><------><------><------>pneigh_enqueue(&nd_tbl, idev->nd_parms, n); <------><------><------><------>goto out; <------><------><------>} <------><------>} else <------><------><------>goto out; <------>} <------>if (is_router < 0) <------><------>is_router = idev->cnf.forwarding; <------>if (dad) { <------><------>ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, <------><------><------> !!is_router, false, (ifp != NULL), true); <------><------>goto out; <------>} <------>if (inc) <------><------>NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); <------>else <------><------>NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); <------>/* <------> * update / create cache entry <------> * for the source address <------> */ <------>neigh = __neigh_lookup(&nd_tbl, saddr, dev, <------><------><------> !inc || lladdr || !dev->addr_len); <------>if (neigh) <------><------>ndisc_update(dev, neigh, lladdr, NUD_STALE, <------><------><------> NEIGH_UPDATE_F_WEAK_OVERRIDE| <------><------><------> NEIGH_UPDATE_F_OVERRIDE, <------><------><------> NDISC_NEIGHBOUR_SOLICITATION, &ndopts); <------>if (neigh || !dev->header_ops) { <------><------>ndisc_send_na(dev, saddr, &msg->target, !!is_router, <------><------><------> true, (ifp != NULL && inc), inc); <------><------>if (neigh) <------><------><------>neigh_release(neigh); <------>} out: <------>if (ifp) <------><------>in6_ifa_put(ifp); <------>else <------><------>in6_dev_put(idev); } static void ndisc_recv_na(struct sk_buff *skb) { <------>struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); <------>struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; <------>const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; <------>u8 *lladdr = NULL; <------>u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + <------><------><------><------> offsetof(struct nd_msg, opt)); <------>struct ndisc_options ndopts; <------>struct net_device *dev = skb->dev; <------>struct inet6_dev *idev = __in6_dev_get(dev); <------>struct inet6_ifaddr *ifp; <------>struct neighbour *neigh; <------>if (skb->len < sizeof(struct nd_msg)) { <------><------>ND_PRINTK(2, warn, "NA: packet too short\n"); <------><------>return; <------>} <------>if (ipv6_addr_is_multicast(&msg->target)) { <------><------>ND_PRINTK(2, warn, "NA: target address is multicast\n"); <------><------>return; <------>} <------>if (ipv6_addr_is_multicast(daddr) && <------> msg->icmph.icmp6_solicited) { <------><------>ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); <------><------>return; <------>} <------>/* For some 802.11 wireless deployments (and possibly other networks), <------> * there will be a NA proxy and unsolicitd packets are attacks <------> * and thus should not be accepted. <------> */ <------>if (!msg->icmph.icmp6_solicited && idev && <------> idev->cnf.drop_unsolicited_na) <------><------>return; <------>if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { <------><------>ND_PRINTK(2, warn, "NS: invalid ND option\n"); <------><------>return; <------>} <------>if (ndopts.nd_opts_tgt_lladdr) { <------><------>lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); <------><------>if (!lladdr) { <------><------><------>ND_PRINTK(2, warn, <------><------><------><------> "NA: invalid link-layer address length\n"); <------><------><------>return; <------><------>} <------>} <------>ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); <------>if (ifp) { <------><------>if (skb->pkt_type != PACKET_LOOPBACK <------><------> && (ifp->flags & IFA_F_TENTATIVE)) { <------><------><------><------>addrconf_dad_failure(skb, ifp); <------><------><------><------>return; <------><------>} <------><------>/* What should we make now? The advertisement <------><------> is invalid, but ndisc specs say nothing <------><------> about it. It could be misconfiguration, or <------><------> an smart proxy agent tries to help us :-) <------><------> We should not print the error if NA has been <------><------> received from loopback - it is just our own <------><------> unsolicited advertisement. <------><------> */ <------><------>if (skb->pkt_type != PACKET_LOOPBACK) <------><------><------>ND_PRINTK(1, warn, <------><------><------><------> "NA: %pM advertised our address %pI6c on %s!\n", <------><------><------><------> eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name); <------><------>in6_ifa_put(ifp); <------><------>return; <------>} <------>neigh = neigh_lookup(&nd_tbl, &msg->target, dev); <------>if (neigh) { <------><------>u8 old_flags = neigh->flags; <------><------>struct net *net = dev_net(dev); <------><------>if (neigh->nud_state & NUD_FAILED) <------><------><------>goto out; <------><------>/* <------><------> * Don't update the neighbor cache entry on a proxy NA from <------><------> * ourselves because either the proxied node is off link or it <------><------> * has already sent a NA to us. <------><------> */ <------><------>if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && <------><------> net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && <------><------> pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { <------><------><------>/* XXX: idev->cnf.proxy_ndp */ <------><------><------>goto out; <------><------>} <------><------>ndisc_update(dev, neigh, lladdr, <------><------><------> msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, <------><------><------> NEIGH_UPDATE_F_WEAK_OVERRIDE| <------><------><------> (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| <------><------><------> NEIGH_UPDATE_F_OVERRIDE_ISROUTER| <------><------><------> (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0), <------><------><------> NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts); <------><------>if ((old_flags & ~neigh->flags) & NTF_ROUTER) { <------><------><------>/* <------><------><------> * Change: router to host <------><------><------> */ <------><------><------>rt6_clean_tohost(dev_net(dev), saddr); <------><------>} out: <------><------>neigh_release(neigh); <------>} } static void ndisc_recv_rs(struct sk_buff *skb) { <------>struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); <------>unsigned long ndoptlen = skb->len - sizeof(*rs_msg); <------>struct neighbour *neigh; <------>struct inet6_dev *idev; <------>const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; <------>struct ndisc_options ndopts; <------>u8 *lladdr = NULL; <------>if (skb->len < sizeof(*rs_msg)) <------><------>return; <------>idev = __in6_dev_get(skb->dev); <------>if (!idev) { <------><------>ND_PRINTK(1, err, "RS: can't find in6 device\n"); <------><------>return; <------>} <------>/* Don't accept RS if we're not in router mode */ <------>if (!idev->cnf.forwarding) <------><------>goto out; <------>/* <------> * Don't update NCE if src = ::; <------> * this implies that the source node has no ip address assigned yet. <------> */ <------>if (ipv6_addr_any(saddr)) <------><------>goto out; <------>/* Parse ND options */ <------>if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) { <------><------>ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); <------><------>goto out; <------>} <------>if (ndopts.nd_opts_src_lladdr) { <------><------>lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, <------><------><------><------><------> skb->dev); <------><------>if (!lladdr) <------><------><------>goto out; <------>} <------>neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); <------>if (neigh) { <------><------>ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, <------><------><------> NEIGH_UPDATE_F_WEAK_OVERRIDE| <------><------><------> NEIGH_UPDATE_F_OVERRIDE| <------><------><------> NEIGH_UPDATE_F_OVERRIDE_ISROUTER, <------><------><------> NDISC_ROUTER_SOLICITATION, &ndopts); <------><------>neigh_release(neigh); <------>} out: <------>return; } static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) { <------>struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); <------>struct sk_buff *skb; <------>struct nlmsghdr *nlh; <------>struct nduseroptmsg *ndmsg; <------>struct net *net = dev_net(ra->dev); <------>int err; <------>int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) <------><------><------><------> + (opt->nd_opt_len << 3)); <------>size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); <------>skb = nlmsg_new(msg_size, GFP_ATOMIC); <------>if (!skb) { <------><------>err = -ENOBUFS; <------><------>goto errout; <------>} <------>nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); <------>if (!nlh) { <------><------>goto nla_put_failure; <------>} <------>ndmsg = nlmsg_data(nlh); <------>ndmsg->nduseropt_family = AF_INET6; <------>ndmsg->nduseropt_ifindex = ra->dev->ifindex; <------>ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; <------>ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; <------>ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; <------>memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); <------>if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) <------><------>goto nla_put_failure; <------>nlmsg_end(skb, nlh); <------>rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); <------>return; nla_put_failure: <------>nlmsg_free(skb); <------>err = -EMSGSIZE; errout: <------>rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); } static void ndisc_router_discovery(struct sk_buff *skb) { <------>struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); <------>struct neighbour *neigh = NULL; <------>struct inet6_dev *in6_dev; <------>struct fib6_info *rt = NULL; <------>struct net *net; <------>int lifetime; <------>struct ndisc_options ndopts; <------>int optlen; <------>unsigned int pref = 0; <------>__u32 old_if_flags; <------>bool send_ifinfo_notify = false; <------>__u8 *opt = (__u8 *)(ra_msg + 1); <------>optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - <------><------>sizeof(struct ra_msg); <------>ND_PRINTK(2, info, <------><------> "RA: %s, dev: %s\n", <------><------> __func__, skb->dev->name); <------>if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { <------><------>ND_PRINTK(2, warn, "RA: source address is not link-local\n"); <------><------>return; <------>} <------>if (optlen < 0) { <------><------>ND_PRINTK(2, warn, "RA: packet too short\n"); <------><------>return; <------>} #ifdef CONFIG_IPV6_NDISC_NODETYPE <------>if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { <------><------>ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); <------><------>return; <------>} #endif <------>/* <------> * set the RA_RECV flag in the interface <------> */ <------>in6_dev = __in6_dev_get(skb->dev); <------>if (!in6_dev) { <------><------>ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", <------><------><------> skb->dev->name); <------><------>return; <------>} <------>if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) { <------><------>ND_PRINTK(2, warn, "RA: invalid ND options\n"); <------><------>return; <------>} <------>if (!ipv6_accept_ra(in6_dev)) { <------><------>ND_PRINTK(2, info, <------><------><------> "RA: %s, did not accept ra for dev: %s\n", <------><------><------> __func__, skb->dev->name); <------><------>goto skip_linkparms; <------>} #ifdef CONFIG_IPV6_NDISC_NODETYPE <------>/* skip link-specific parameters from interior routers */ <------>if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { <------><------>ND_PRINTK(2, info, <------><------><------> "RA: %s, nodetype is NODEFAULT, dev: %s\n", <------><------><------> __func__, skb->dev->name); <------><------>goto skip_linkparms; <------>} #endif <------>if (in6_dev->if_flags & IF_RS_SENT) { <------><------>/* <------><------> * flag that an RA was received after an RS was sent <------><------> * out on this interface. <------><------> */ <------><------>in6_dev->if_flags |= IF_RA_RCVD; <------>} <------>/* <------> * Remember the managed/otherconf flags from most recently <------> * received RA message (RFC 2462) -- yoshfuji <------> */ <------>old_if_flags = in6_dev->if_flags; <------>in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | <------><------><------><------>IF_RA_OTHERCONF)) | <------><------><------><------>(ra_msg->icmph.icmp6_addrconf_managed ? <------><------><------><------><------>IF_RA_MANAGED : 0) | <------><------><------><------>(ra_msg->icmph.icmp6_addrconf_other ? <------><------><------><------><------>IF_RA_OTHERCONF : 0); <------>if (old_if_flags != in6_dev->if_flags) <------><------>send_ifinfo_notify = true; <------>if (!in6_dev->cnf.accept_ra_defrtr) { <------><------>ND_PRINTK(2, info, <------><------><------> "RA: %s, defrtr is false for dev: %s\n", <------><------><------> __func__, skb->dev->name); <------><------>goto skip_defrtr; <------>} <------>/* Do not accept RA with source-addr found on local machine unless <------> * accept_ra_from_local is set to true. <------> */ <------>net = dev_net(in6_dev->dev); <------>if (!in6_dev->cnf.accept_ra_from_local && <------> ipv6_chk_addr(net, &ipv6_hdr(skb)->saddr, in6_dev->dev, 0)) { <------><------>ND_PRINTK(2, info, <------><------><------> "RA from local address detected on dev: %s: default router ignored\n", <------><------><------> skb->dev->name); <------><------>goto skip_defrtr; <------>} <------>lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); #ifdef CONFIG_IPV6_ROUTER_PREF <------>pref = ra_msg->icmph.icmp6_router_pref; <------>/* 10b is handled as if it were 00b (medium) */ <------>if (pref == ICMPV6_ROUTER_PREF_INVALID || <------> !in6_dev->cnf.accept_ra_rtr_pref) <------><------>pref = ICMPV6_ROUTER_PREF_MEDIUM; #endif <------>/* routes added from RAs do not use nexthop objects */ <------>rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev); <------>if (rt) { <------><------>neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, <------><------><------><------><------> rt->fib6_nh->fib_nh_dev, NULL, <------><------><------><------><------> &ipv6_hdr(skb)->saddr); <------><------>if (!neigh) { <------><------><------>ND_PRINTK(0, err, <------><------><------><------> "RA: %s got default router without neighbour\n", <------><------><------><------> __func__); <------><------><------>fib6_info_release(rt); <------><------><------>return; <------><------>} <------>} <------>if (rt && lifetime == 0) { <------><------>ip6_del_rt(net, rt, false); <------><------>rt = NULL; <------>} <------>ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", <------><------> rt, lifetime, skb->dev->name); <------>if (!rt && lifetime) { <------><------>ND_PRINTK(3, info, "RA: adding default router\n"); <------><------>rt = rt6_add_dflt_router(net, &ipv6_hdr(skb)->saddr, <------><------><------><------><------> skb->dev, pref); <------><------>if (!rt) { <------><------><------>ND_PRINTK(0, err, <------><------><------><------> "RA: %s failed to add default route\n", <------><------><------><------> __func__); <------><------><------>return; <------><------>} <------><------>neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6, <------><------><------><------><------> rt->fib6_nh->fib_nh_dev, NULL, <------><------><------><------><------> &ipv6_hdr(skb)->saddr); <------><------>if (!neigh) { <------><------><------>ND_PRINTK(0, err, <------><------><------><------> "RA: %s got default router without neighbour\n", <------><------><------><------> __func__); <------><------><------>fib6_info_release(rt); <------><------><------>return; <------><------>} <------><------>neigh->flags |= NTF_ROUTER; <------>} else if (rt) { <------><------>rt->fib6_flags = (rt->fib6_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); <------>} <------>if (rt) <------><------>fib6_set_expires(rt, jiffies + (HZ * lifetime)); <------>if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && <------> ra_msg->icmph.icmp6_hop_limit) { <------><------>if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { <------><------><------>in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; <------><------><------>fib6_metric_set(rt, RTAX_HOPLIMIT, <------><------><------><------><------>ra_msg->icmph.icmp6_hop_limit); <------><------>} else { <------><------><------>ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); <------><------>} <------>} skip_defrtr: <------>/* <------> * Update Reachable Time and Retrans Timer <------> */ <------>if (in6_dev->nd_parms) { <------><------>unsigned long rtime = ntohl(ra_msg->retrans_timer); <------><------>if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { <------><------><------>rtime = (rtime*HZ)/1000; <------><------><------>if (rtime < HZ/100) <------><------><------><------>rtime = HZ/100; <------><------><------>NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); <------><------><------>in6_dev->tstamp = jiffies; <------><------><------>send_ifinfo_notify = true; <------><------>} <------><------>rtime = ntohl(ra_msg->reachable_time); <------><------>if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { <------><------><------>rtime = (rtime*HZ)/1000; <------><------><------>if (rtime < HZ/10) <------><------><------><------>rtime = HZ/10; <------><------><------>if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { <------><------><------><------>NEIGH_VAR_SET(in6_dev->nd_parms, <------><------><------><------><------> BASE_REACHABLE_TIME, rtime); <------><------><------><------>NEIGH_VAR_SET(in6_dev->nd_parms, <------><------><------><------><------> GC_STALETIME, 3 * rtime); <------><------><------><------>in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); <------><------><------><------>in6_dev->tstamp = jiffies; <------><------><------><------>send_ifinfo_notify = true; <------><------><------>} <------><------>} <------>} <------>/* <------> * Send a notify if RA changed managed/otherconf flags or timer settings <------> */ <------>if (send_ifinfo_notify) <------><------>inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); skip_linkparms: <------>/* <------> * Process options. <------> */ <------>if (!neigh) <------><------>neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, <------><------><------><------> skb->dev, 1); <------>if (neigh) { <------><------>u8 *lladdr = NULL; <------><------>if (ndopts.nd_opts_src_lladdr) { <------><------><------>lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, <------><------><------><------><------><------> skb->dev); <------><------><------>if (!lladdr) { <------><------><------><------>ND_PRINTK(2, warn, <------><------><------><------><------> "RA: invalid link-layer address length\n"); <------><------><------><------>goto out; <------><------><------>} <------><------>} <------><------>ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, <------><------><------> NEIGH_UPDATE_F_WEAK_OVERRIDE| <------><------><------> NEIGH_UPDATE_F_OVERRIDE| <------><------><------> NEIGH_UPDATE_F_OVERRIDE_ISROUTER| <------><------><------> NEIGH_UPDATE_F_ISROUTER, <------><------><------> NDISC_ROUTER_ADVERTISEMENT, &ndopts); <------>} <------>if (!ipv6_accept_ra(in6_dev)) { <------><------>ND_PRINTK(2, info, <------><------><------> "RA: %s, accept_ra is false for dev: %s\n", <------><------><------> __func__, skb->dev->name); <------><------>goto out; <------>} #ifdef CONFIG_IPV6_ROUTE_INFO <------>if (!in6_dev->cnf.accept_ra_from_local && <------> ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, <------><------><------> in6_dev->dev, 0)) { <------><------>ND_PRINTK(2, info, <------><------><------> "RA from local address detected on dev: %s: router info ignored.\n", <------><------><------> skb->dev->name); <------><------>goto skip_routeinfo; <------>} <------>if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { <------><------>struct nd_opt_hdr *p; <------><------>for (p = ndopts.nd_opts_ri; <------><------> p; <------><------> p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { <------><------><------>struct route_info *ri = (struct route_info *)p; #ifdef CONFIG_IPV6_NDISC_NODETYPE <------><------><------>if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && <------><------><------> ri->prefix_len == 0) <------><------><------><------>continue; #endif <------><------><------>if (ri->prefix_len == 0 && <------><------><------> !in6_dev->cnf.accept_ra_defrtr) <------><------><------><------>continue; <------><------><------>if (ri->prefix_len < in6_dev->cnf.accept_ra_rt_info_min_plen) <------><------><------><------>continue; <------><------><------>if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) <------><------><------><------>continue; <------><------><------>rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, <------><------><------><------> &ipv6_hdr(skb)->saddr); <------><------>} <------>} skip_routeinfo: #endif #ifdef CONFIG_IPV6_NDISC_NODETYPE <------>/* skip link-specific ndopts from interior routers */ <------>if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { <------><------>ND_PRINTK(2, info, <------><------><------> "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", <------><------><------> __func__, skb->dev->name); <------><------>goto out; <------>} #endif <------>if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { <------><------>struct nd_opt_hdr *p; <------><------>for (p = ndopts.nd_opts_pi; <------><------> p; <------><------> p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { <------><------><------>addrconf_prefix_rcv(skb->dev, (u8 *)p, <------><------><------><------><------> (p->nd_opt_len) << 3, <------><------><------><------><------> ndopts.nd_opts_src_lladdr != NULL); <------><------>} <------>} <------>if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { <------><------>__be32 n; <------><------>u32 mtu; <------><------>memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); <------><------>mtu = ntohl(n); <------><------>if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { <------><------><------>ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); <------><------>} else if (in6_dev->cnf.mtu6 != mtu) { <------><------><------>in6_dev->cnf.mtu6 = mtu; <------><------><------>fib6_metric_set(rt, RTAX_MTU, mtu); <------><------><------>rt6_mtu_change(skb->dev, mtu); <------><------>} <------>} <------>if (ndopts.nd_useropts) { <------><------>struct nd_opt_hdr *p; <------><------>for (p = ndopts.nd_useropts; <------><------> p; <------><------> p = ndisc_next_useropt(skb->dev, p, <------><------><------><------><------> ndopts.nd_useropts_end)) { <------><------><------>ndisc_ra_useropt(skb, p); <------><------>} <------>} <------>if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { <------><------>ND_PRINTK(2, warn, "RA: invalid RA options\n"); <------>} out: <------>fib6_info_release(rt); <------>if (neigh) <------><------>neigh_release(neigh); } static void ndisc_redirect_rcv(struct sk_buff *skb) { <------>u8 *hdr; <------>struct ndisc_options ndopts; <------>struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); <------>u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + <------><------><------><------> offsetof(struct rd_msg, opt)); #ifdef CONFIG_IPV6_NDISC_NODETYPE <------>switch (skb->ndisc_nodetype) { <------>case NDISC_NODETYPE_HOST: <------>case NDISC_NODETYPE_NODEFAULT: <------><------>ND_PRINTK(2, warn, <------><------><------> "Redirect: from host or unauthorized router\n"); <------><------>return; <------>} #endif <------>if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { <------><------>ND_PRINTK(2, warn, <------><------><------> "Redirect: source address is not link-local\n"); <------><------>return; <------>} <------>if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts)) <------><------>return; <------>if (!ndopts.nd_opts_rh) { <------><------>ip6_redirect_no_header(skb, dev_net(skb->dev), <------><------><------><------><------>skb->dev->ifindex); <------><------>return; <------>} <------>hdr = (u8 *)ndopts.nd_opts_rh; <------>hdr += 8; <------>if (!pskb_pull(skb, hdr - skb_transport_header(skb))) <------><------>return; <------>icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); } static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, <------><------><------><------><------> struct sk_buff *orig_skb, <------><------><------><------><------> int rd_len) { <------>u8 *opt = skb_put(skb, rd_len); <------>memset(opt, 0, 8); <------>*(opt++) = ND_OPT_REDIRECT_HDR; <------>*(opt++) = (rd_len >> 3); <------>opt += 6; <------>skb_copy_bits(orig_skb, skb_network_offset(orig_skb), opt, <------><------> rd_len - 8); } void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) { <------>struct net_device *dev = skb->dev; <------>struct net *net = dev_net(dev); <------>struct sock *sk = net->ipv6.ndisc_sk; <------>int optlen = 0; <------>struct inet_peer *peer; <------>struct sk_buff *buff; <------>struct rd_msg *msg; <------>struct in6_addr saddr_buf; <------>struct rt6_info *rt; <------>struct dst_entry *dst; <------>struct flowi6 fl6; <------>int rd_len; <------>u8 ha_buf[MAX_ADDR_LEN], *ha = NULL, <------> ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL; <------>bool ret; <------>if (netif_is_l3_master(skb->dev)) { <------><------>dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); <------><------>if (!dev) <------><------><------>return; <------>} <------>if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { <------><------>ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", <------><------><------> dev->name); <------><------>return; <------>} <------>if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && <------> ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { <------><------>ND_PRINTK(2, warn, <------><------><------> "Redirect: target address is not link-local unicast\n"); <------><------>return; <------>} <------>icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, <------><------><------> &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); <------>dst = ip6_route_output(net, NULL, &fl6); <------>if (dst->error) { <------><------>dst_release(dst); <------><------>return; <------>} <------>dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); <------>if (IS_ERR(dst)) <------><------>return; <------>rt = (struct rt6_info *) dst; <------>if (rt->rt6i_flags & RTF_GATEWAY) { <------><------>ND_PRINTK(2, warn, <------><------><------> "Redirect: destination is not a neighbour\n"); <------><------>goto release; <------>} <------>peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); <------>ret = inet_peer_xrlim_allow(peer, 1*HZ); <------>if (peer) <------><------>inet_putpeer(peer); <------>if (!ret) <------><------>goto release; <------>if (dev->addr_len) { <------><------>struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); <------><------>if (!neigh) { <------><------><------>ND_PRINTK(2, warn, <------><------><------><------> "Redirect: no neigh for target address\n"); <------><------><------>goto release; <------><------>} <------><------>read_lock_bh(&neigh->lock); <------><------>if (neigh->nud_state & NUD_VALID) { <------><------><------>memcpy(ha_buf, neigh->ha, dev->addr_len); <------><------><------>read_unlock_bh(&neigh->lock); <------><------><------>ha = ha_buf; <------><------><------>optlen += ndisc_redirect_opt_addr_space(dev, neigh, <------><------><------><------><------><------><------><------>ops_data_buf, <------><------><------><------><------><------><------><------>&ops_data); <------><------>} else <------><------><------>read_unlock_bh(&neigh->lock); <------><------>neigh_release(neigh); <------>} <------>rd_len = min_t(unsigned int, <------><------> IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, <------><------> skb->len + 8); <------>rd_len &= ~0x7; <------>optlen += rd_len; <------>buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); <------>if (!buff) <------><------>goto release; <------>msg = skb_put(buff, sizeof(*msg)); <------>*msg = (struct rd_msg) { <------><------>.icmph = { <------><------><------>.icmp6_type = NDISC_REDIRECT, <------><------>}, <------><------>.target = *target, <------><------>.dest = ipv6_hdr(skb)->daddr, <------>}; <------>/* <------> * include target_address option <------> */ <------>if (ha) <------><------>ndisc_fill_redirect_addr_option(buff, ha, ops_data); <------>/* <------> * build redirect option and copy skb over to the new packet. <------> */ <------>if (rd_len) <------><------>ndisc_fill_redirect_hdr_option(buff, skb, rd_len); <------>skb_dst_set(buff, dst); <------>ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); <------>return; release: <------>dst_release(dst); } static void pndisc_redo(struct sk_buff *skb) { <------>ndisc_recv_ns(skb); <------>kfree_skb(skb); } static int ndisc_is_multicast(const void *pkey) { <------>return ipv6_addr_is_multicast((struct in6_addr *)pkey); } static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) { <------>struct inet6_dev *idev = __in6_dev_get(skb->dev); <------>if (!idev) <------><------>return true; <------>if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && <------> idev->cnf.suppress_frag_ndisc) { <------><------>net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); <------><------>return true; <------>} <------>return false; } int ndisc_rcv(struct sk_buff *skb) { <------>struct nd_msg *msg; <------>if (ndisc_suppress_frag_ndisc(skb)) <------><------>return 0; <------>if (skb_linearize(skb)) <------><------>return 0; <------>msg = (struct nd_msg *)skb_transport_header(skb); <------>__skb_push(skb, skb->data - skb_transport_header(skb)); <------>if (ipv6_hdr(skb)->hop_limit != 255) { <------><------>ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", <------><------><------> ipv6_hdr(skb)->hop_limit); <------><------>return 0; <------>} <------>if (msg->icmph.icmp6_code != 0) { <------><------>ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", <------><------><------> msg->icmph.icmp6_code); <------><------>return 0; <------>} <------>switch (msg->icmph.icmp6_type) { <------>case NDISC_NEIGHBOUR_SOLICITATION: <------><------>memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); <------><------>ndisc_recv_ns(skb); <------><------>break; <------>case NDISC_NEIGHBOUR_ADVERTISEMENT: <------><------>ndisc_recv_na(skb); <------><------>break; <------>case NDISC_ROUTER_SOLICITATION: <------><------>ndisc_recv_rs(skb); <------><------>break; <------>case NDISC_ROUTER_ADVERTISEMENT: <------><------>ndisc_router_discovery(skb); <------><------>break; <------>case NDISC_REDIRECT: <------><------>ndisc_redirect_rcv(skb); <------><------>break; <------>} <------>return 0; } static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) { <------>struct net_device *dev = netdev_notifier_info_to_dev(ptr); <------>struct netdev_notifier_change_info *change_info; <------>struct net *net = dev_net(dev); <------>struct inet6_dev *idev; <------>switch (event) { <------>case NETDEV_CHANGEADDR: <------><------>neigh_changeaddr(&nd_tbl, dev); <------><------>fib6_run_gc(0, net, false); <------><------>fallthrough; <------>case NETDEV_UP: <------><------>idev = in6_dev_get(dev); <------><------>if (!idev) <------><------><------>break; <------><------>if (idev->cnf.ndisc_notify || <------><------> net->ipv6.devconf_all->ndisc_notify) <------><------><------>ndisc_send_unsol_na(dev); <------><------>in6_dev_put(idev); <------><------>break; <------>case NETDEV_CHANGE: <------><------>change_info = ptr; <------><------>if (change_info->flags_changed & IFF_NOARP) <------><------><------>neigh_changeaddr(&nd_tbl, dev); <------><------>if (!netif_carrier_ok(dev)) <------><------><------>neigh_carrier_down(&nd_tbl, dev); <------><------>break; <------>case NETDEV_DOWN: <------><------>neigh_ifdown(&nd_tbl, dev); <------><------>fib6_run_gc(0, net, false); <------><------>break; <------>case NETDEV_NOTIFY_PEERS: <------><------>ndisc_send_unsol_na(dev); <------><------>break; <------>default: <------><------>break; <------>} <------>return NOTIFY_DONE; } static struct notifier_block ndisc_netdev_notifier = { <------>.notifier_call = ndisc_netdev_event, <------>.priority = ADDRCONF_NOTIFY_PRIORITY - 5, }; #ifdef CONFIG_SYSCTL static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, <------><------><------><------><------> const char *func, const char *dev_name) { <------>static char warncomm[TASK_COMM_LEN]; <------>static int warned; <------>if (strcmp(warncomm, current->comm) && warned < 5) { <------><------>strcpy(warncomm, current->comm); <------><------>pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n", <------><------><------>warncomm, func, <------><------><------>dev_name, ctl->procname, <------><------><------>dev_name, ctl->procname); <------><------>warned++; <------>} } int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void *buffer, <------><------>size_t *lenp, loff_t *ppos) { <------>struct net_device *dev = ctl->extra1; <------>struct inet6_dev *idev; <------>int ret; <------>if ((strcmp(ctl->procname, "retrans_time") == 0) || <------> (strcmp(ctl->procname, "base_reachable_time") == 0)) <------><------>ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); <------>if (strcmp(ctl->procname, "retrans_time") == 0) <------><------>ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); <------>else if (strcmp(ctl->procname, "base_reachable_time") == 0) <------><------>ret = neigh_proc_dointvec_jiffies(ctl, write, <------><------><------><------><------><------> buffer, lenp, ppos); <------>else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || <------><------> (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) <------><------>ret = neigh_proc_dointvec_ms_jiffies(ctl, write, <------><------><------><------><------><------> buffer, lenp, ppos); <------>else <------><------>ret = -1; <------>if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { <------><------>if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) <------><------><------>idev->nd_parms->reachable_time = <------><------><------><------><------>neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); <------><------>idev->tstamp = jiffies; <------><------>inet6_ifinfo_notify(RTM_NEWLINK, idev); <------><------>in6_dev_put(idev); <------>} <------>return ret; } #endif static int __net_init ndisc_net_init(struct net *net) { <------>struct ipv6_pinfo *np; <------>struct sock *sk; <------>int err; <------>err = inet_ctl_sock_create(&sk, PF_INET6, <------><------><------><------> SOCK_RAW, IPPROTO_ICMPV6, net); <------>if (err < 0) { <------><------>ND_PRINTK(0, err, <------><------><------> "NDISC: Failed to initialize the control socket (err %d)\n", <------><------><------> err); <------><------>return err; <------>} <------>net->ipv6.ndisc_sk = sk; <------>np = inet6_sk(sk); <------>np->hop_limit = 255; <------>/* Do not loopback ndisc messages */ <------>np->mc_loop = 0; <------>return 0; } static void __net_exit ndisc_net_exit(struct net *net) { <------>inet_ctl_sock_destroy(net->ipv6.ndisc_sk); } static struct pernet_operations ndisc_net_ops = { <------>.init = ndisc_net_init, <------>.exit = ndisc_net_exit, }; int __init ndisc_init(void) { <------>int err; <------>err = register_pernet_subsys(&ndisc_net_ops); <------>if (err) <------><------>return err; <------>/* <------> * Initialize the neighbour table <------> */ <------>neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); #ifdef CONFIG_SYSCTL <------>err = neigh_sysctl_register(NULL, &nd_tbl.parms, <------><------><------><------> ndisc_ifinfo_sysctl_change); <------>if (err) <------><------>goto out_unregister_pernet; out: #endif <------>return err; #ifdef CONFIG_SYSCTL out_unregister_pernet: <------>unregister_pernet_subsys(&ndisc_net_ops); <------>goto out; #endif } int __init ndisc_late_init(void) { <------>return register_netdevice_notifier(&ndisc_netdev_notifier); } void ndisc_late_cleanup(void) { <------>unregister_netdevice_notifier(&ndisc_netdev_notifier); } void ndisc_cleanup(void) { #ifdef CONFIG_SYSCTL <------>neigh_sysctl_unregister(&nd_tbl.parms); #endif <------>neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); <------>unregister_pernet_subsys(&ndisc_net_ops); }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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