diff options
Diffstat (limited to 'net/ipv4/fib_frontend.c')
| -rw-r--r-- | net/ipv4/fib_frontend.c | 1070 |
1 files changed, 1070 insertions, 0 deletions
diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c new file mode 100644 index 0000000..65c1503 --- /dev/null +++ b/net/ipv4/fib_frontend.c @@ -0,0 +1,1070 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * IPv4 Forwarding Information Base: FIB frontend. + * + * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include <linux/module.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <linux/bitops.h> +#include <linux/capability.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/errno.h> +#include <linux/in.h> +#include <linux/inet.h> +#include <linux/inetdevice.h> +#include <linux/netdevice.h> +#include <linux/if_addr.h> +#include <linux/if_arp.h> +#include <linux/skbuff.h> +#include <linux/init.h> +#include <linux/list.h> + +#include <net/ip.h> +#include <net/protocol.h> +#include <net/route.h> +#include <net/tcp.h> +#include <net/sock.h> +#include <net/icmp.h> +#include <net/arp.h> +#include <net/ip_fib.h> +#include <net/rtnetlink.h> + +#ifndef CONFIG_IP_MULTIPLE_TABLES + +static int __net_init fib4_rules_init(struct net *net) +{ + struct fib_table *local_table, *main_table; + + local_table = fib_hash_table(RT_TABLE_LOCAL); + if (local_table == NULL) + return -ENOMEM; + + main_table = fib_hash_table(RT_TABLE_MAIN); + if (main_table == NULL) + goto fail; + + hlist_add_head_rcu(&local_table->tb_hlist, + &net->ipv4.fib_table_hash[TABLE_LOCAL_INDEX]); + hlist_add_head_rcu(&main_table->tb_hlist, + &net->ipv4.fib_table_hash[TABLE_MAIN_INDEX]); + return 0; + +fail: + kfree(local_table); + return -ENOMEM; +} +#else + +struct fib_table *fib_new_table(struct net *net, u32 id) +{ + struct fib_table *tb; + unsigned int h; + + if (id == 0) + id = RT_TABLE_MAIN; + tb = fib_get_table(net, id); + if (tb) + return tb; + + tb = fib_hash_table(id); + if (!tb) + return NULL; + h = id & (FIB_TABLE_HASHSZ - 1); + hlist_add_head_rcu(&tb->tb_hlist, &net->ipv4.fib_table_hash[h]); + return tb; +} + +struct fib_table *fib_get_table(struct net *net, u32 id) +{ + struct fib_table *tb; + struct hlist_node *node; + struct hlist_head *head; + unsigned int h; + + if (id == 0) + id = RT_TABLE_MAIN; + h = id & (FIB_TABLE_HASHSZ - 1); + + rcu_read_lock(); + head = &net->ipv4.fib_table_hash[h]; + hlist_for_each_entry_rcu(tb, node, head, tb_hlist) { + if (tb->tb_id == id) { + rcu_read_unlock(); + return tb; + } + } + rcu_read_unlock(); + return NULL; +} +#endif /* CONFIG_IP_MULTIPLE_TABLES */ + +void fib_select_default(struct net *net, + const struct flowi *flp, struct fib_result *res) +{ + struct fib_table *tb; + int table = RT_TABLE_MAIN; +#ifdef CONFIG_IP_MULTIPLE_TABLES + if (res->r == NULL || res->r->action != FR_ACT_TO_TBL) + return; + table = res->r->table; +#endif + tb = fib_get_table(net, table); + if (FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) + tb->tb_select_default(tb, flp, res); +} + +static void fib_flush(struct net *net) +{ + int flushed = 0; + struct fib_table *tb; + struct hlist_node *node; + struct hlist_head *head; + unsigned int h; + + for (h = 0; h < FIB_TABLE_HASHSZ; h++) { + head = &net->ipv4.fib_table_hash[h]; + hlist_for_each_entry(tb, node, head, tb_hlist) + flushed += tb->tb_flush(tb); + } + + if (flushed) + rt_cache_flush(net, -1); +} + +/* + * Find the first device with a given source address. + */ + +struct net_device * ip_dev_find(struct net *net, __be32 addr) +{ + struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; + struct fib_result res; + struct net_device *dev = NULL; + struct fib_table *local_table; + +#ifdef CONFIG_IP_MULTIPLE_TABLES + res.r = NULL; +#endif + + local_table = fib_get_table(net, RT_TABLE_LOCAL); + if (!local_table || local_table->tb_lookup(local_table, &fl, &res)) + return NULL; + if (res.type != RTN_LOCAL) + goto out; + dev = FIB_RES_DEV(res); + + if (dev) + dev_hold(dev); +out: + fib_res_put(&res); + return dev; +} + +/* + * Find address type as if only "dev" was present in the system. If + * on_dev is NULL then all interfaces are taken into consideration. + */ +static inline unsigned __inet_dev_addr_type(struct net *net, + const struct net_device *dev, + __be32 addr) +{ + struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } } }; + struct fib_result res; + unsigned ret = RTN_BROADCAST; + struct fib_table *local_table; + + if (ipv4_is_zeronet(addr) || ipv4_is_lbcast(addr)) + return RTN_BROADCAST; + if (ipv4_is_multicast(addr)) + return RTN_MULTICAST; + +#ifdef CONFIG_IP_MULTIPLE_TABLES + res.r = NULL; +#endif + + local_table = fib_get_table(net, RT_TABLE_LOCAL); + if (local_table) { + ret = RTN_UNICAST; + if (!local_table->tb_lookup(local_table, &fl, &res)) { + if (!dev || dev == res.fi->fib_dev) + ret = res.type; + fib_res_put(&res); + } + } + return ret; +} + +unsigned int inet_addr_type(struct net *net, __be32 addr) +{ + return __inet_dev_addr_type(net, NULL, addr); +} + +unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, + __be32 addr) +{ + return __inet_dev_addr_type(net, dev, addr); +} + +/* Given (packet source, input interface) and optional (dst, oif, tos): + - (main) check, that source is valid i.e. not broadcast or our local + address. + - figure out what "logical" interface this packet arrived + and calculate "specific destination" address. + - check, that packet arrived from expected physical interface. + */ + +int fib_validate_source(__be32 src, __be32 dst, u8 tos, int oif, + struct net_device *dev, __be32 *spec_dst, u32 *itag) +{ + struct in_device *in_dev; + struct flowi fl = { .nl_u = { .ip4_u = + { .daddr = src, + .saddr = dst, + .tos = tos } }, + .iif = oif }; + struct fib_result res; + int no_addr, rpf; + int ret; + struct net *net; + + no_addr = rpf = 0; + rcu_read_lock(); + in_dev = __in_dev_get_rcu(dev); + if (in_dev) { + no_addr = in_dev->ifa_list == NULL; + rpf = IN_DEV_RPFILTER(in_dev); + } + rcu_read_unlock(); + + if (in_dev == NULL) + goto e_inval; + + net = dev_net(dev); + if (fib_lookup(net, &fl, &res)) + goto last_resort; + if (res.type != RTN_UNICAST) + goto e_inval_res; + *spec_dst = FIB_RES_PREFSRC(res); + fib_combine_itag(itag, &res); +#ifdef CONFIG_IP_ROUTE_MULTIPATH + if (FIB_RES_DEV(res) == dev || res.fi->fib_nhs > 1) +#else + if (FIB_RES_DEV(res) == dev) +#endif + { + ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; + fib_res_put(&res); + return ret; + } + fib_res_put(&res); + if (no_addr) + goto last_resort; + if (rpf) + goto e_inval; + fl.oif = dev->ifindex; + + ret = 0; + if (fib_lookup(net, &fl, &res) == 0) { + if (res.type == RTN_UNICAST) { + *spec_dst = FIB_RES_PREFSRC(res); + ret = FIB_RES_NH(res).nh_scope >= RT_SCOPE_HOST; + } + fib_res_put(&res); + } + return ret; + +last_resort: + if (rpf) + goto e_inval; + *spec_dst = inet_select_addr(dev, 0, RT_SCOPE_UNIVERSE); + *itag = 0; + return 0; + +e_inval_res: + fib_res_put(&res); +e_inval: + return -EINVAL; +} + +static inline __be32 sk_extract_addr(struct sockaddr *addr) +{ + return ((struct sockaddr_in *) addr)->sin_addr.s_addr; +} + +static int put_rtax(struct nlattr *mx, int len, int type, u32 value) +{ + struct nlattr *nla; + + nla = (struct nlattr *) ((char *) mx + len); + nla->nla_type = type; + nla->nla_len = nla_attr_size(4); + *(u32 *) nla_data(nla) = value; + + return len + nla_total_size(4); +} + +static int rtentry_to_fib_config(struct net *net, int cmd, struct rtentry *rt, + struct fib_config *cfg) +{ + __be32 addr; + int plen; + + memset(cfg, 0, sizeof(*cfg)); + cfg->fc_nlinfo.nl_net = net; + + if (rt->rt_dst.sa_family != AF_INET) + return -EAFNOSUPPORT; + + /* + * Check mask for validity: + * a) it must be contiguous. + * b) destination must have all host bits clear. + * c) if application forgot to set correct family (AF_INET), + * reject request unless it is absolutely clear i.e. + * both family and mask are zero. + */ + plen = 32; + addr = sk_extract_addr(&rt->rt_dst); + if (!(rt->rt_flags & RTF_HOST)) { + __be32 mask = sk_extract_addr(&rt->rt_genmask); + + if (rt->rt_genmask.sa_family != AF_INET) { + if (mask || rt->rt_genmask.sa_family) + return -EAFNOSUPPORT; + } + + if (bad_mask(mask, addr)) + return -EINVAL; + + plen = inet_mask_len(mask); + } + + cfg->fc_dst_len = plen; + cfg->fc_dst = addr; + + if (cmd != SIOCDELRT) { + cfg->fc_nlflags = NLM_F_CREATE; + cfg->fc_protocol = RTPROT_BOOT; + } + + if (rt->rt_metric) + cfg->fc_priority = rt->rt_metric - 1; + + if (rt->rt_flags & RTF_REJECT) { + cfg->fc_scope = RT_SCOPE_HOST; + cfg->fc_type = RTN_UNREACHABLE; + return 0; + } + + cfg->fc_scope = RT_SCOPE_NOWHERE; + cfg->fc_type = RTN_UNICAST; + + if (rt->rt_dev) { + char *colon; + struct net_device *dev; + char devname[IFNAMSIZ]; + + if (copy_from_user(devname, rt->rt_dev, IFNAMSIZ-1)) + return -EFAULT; + + devname[IFNAMSIZ-1] = 0; + colon = strchr(devname, ':'); + if (colon) + *colon = 0; + dev = __dev_get_by_name(net, devname); + if (!dev) + return -ENODEV; + cfg->fc_oif = dev->ifindex; + if (colon) { + struct in_ifaddr *ifa; + struct in_device *in_dev = __in_dev_get_rtnl(dev); + if (!in_dev) + return -ENODEV; + *colon = ':'; + for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) + if (strcmp(ifa->ifa_label, devname) == 0) + break; + if (ifa == NULL) + return -ENODEV; + cfg->fc_prefsrc = ifa->ifa_local; + } + } + + addr = sk_extract_addr(&rt->rt_gateway); + if (rt->rt_gateway.sa_family == AF_INET && addr) { + cfg->fc_gw = addr; + if (rt->rt_flags & RTF_GATEWAY && + inet_addr_type(net, addr) == RTN_UNICAST) + cfg->fc_scope = RT_SCOPE_UNIVERSE; + } + + if (cmd == SIOCDELRT) + return 0; + + if (rt->rt_flags & RTF_GATEWAY && !cfg->fc_gw) + return -EINVAL; + + if (cfg->fc_scope == RT_SCOPE_NOWHERE) + cfg->fc_scope = RT_SCOPE_LINK; + + if (rt->rt_flags & (RTF_MTU | RTF_WINDOW | RTF_IRTT)) { + struct nlattr *mx; + int len = 0; + + mx = kzalloc(3 * nla_total_size(4), GFP_KERNEL); + if (mx == NULL) + return -ENOMEM; + + if (rt->rt_flags & RTF_MTU) + len = put_rtax(mx, len, RTAX_ADVMSS, rt->rt_mtu - 40); + + if (rt->rt_flags & RTF_WINDOW) + len = put_rtax(mx, len, RTAX_WINDOW, rt->rt_window); + + if (rt->rt_flags & RTF_IRTT) + len = put_rtax(mx, len, RTAX_RTT, rt->rt_irtt << 3); + + cfg->fc_mx = mx; + cfg->fc_mx_len = len; + } + + return 0; +} + +/* + * Handle IP routing ioctl calls. These are used to manipulate the routing tables + */ + +int ip_rt_ioctl(struct net *net, unsigned int cmd, void __user *arg) +{ + struct fib_config cfg; + struct rtentry rt; + int err; + + switch (cmd) { + case SIOCADDRT: /* Add a route */ + case SIOCDELRT: /* Delete a route */ + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + if (copy_from_user(&rt, arg, sizeof(rt))) + return -EFAULT; + + rtnl_lock(); + err = rtentry_to_fib_config(net, cmd, &rt, &cfg); + if (err == 0) { + struct fib_table *tb; + + if (cmd == SIOCDELRT) { + tb = fib_get_table(net, cfg.fc_table); + if (tb) + err = tb->tb_delete(tb, &cfg); + else + err = -ESRCH; + } else { + tb = fib_new_table(net, cfg.fc_table); + if (tb) + err = tb->tb_insert(tb, &cfg); + else + err = -ENOBUFS; + } + + /* allocated by rtentry_to_fib_config() */ + kfree(cfg.fc_mx); + } + rtnl_unlock(); + return err; + } + return -EINVAL; +} + +const struct nla_policy rtm_ipv4_policy[RTA_MAX+1] = { + [RTA_DST] = { .type = NLA_U32 }, + [RTA_SRC] = { .type = NLA_U32 }, + [RTA_IIF] = { .type = NLA_U32 }, + [RTA_OIF] = { .type = NLA_U32 }, + [RTA_GATEWAY] = { .type = NLA_U32 }, + [RTA_PRIORITY] = { .type = NLA_U32 }, + [RTA_PREFSRC] = { .type = NLA_U32 }, + [RTA_METRICS] = { .type = NLA_NESTED }, + [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, + [RTA_FLOW] = { .type = NLA_U32 }, +}; + +static int rtm_to_fib_config(struct net *net, struct sk_buff *skb, + struct nlmsghdr *nlh, struct fib_config *cfg) +{ + struct nlattr *attr; + int err, remaining; + struct rtmsg *rtm; + + err = nlmsg_validate(nlh, sizeof(*rtm), RTA_MAX, rtm_ipv4_policy); + if (err < 0) + goto errout; + + memset(cfg, 0, sizeof(*cfg)); + + rtm = nlmsg_data(nlh); + cfg->fc_dst_len = rtm->rtm_dst_len; + cfg->fc_tos = rtm->rtm_tos; + cfg->fc_table = rtm->rtm_table; + cfg->fc_protocol = rtm->rtm_protocol; + cfg->fc_scope = rtm->rtm_scope; + cfg->fc_type = rtm->rtm_type; + cfg->fc_flags = rtm->rtm_flags; + cfg->fc_nlflags = nlh->nlmsg_flags; + + cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; + cfg->fc_nlinfo.nlh = nlh; + cfg->fc_nlinfo.nl_net = net; + + if (cfg->fc_type > RTN_MAX) { + err = -EINVAL; + goto errout; + } + + nlmsg_for_each_attr(attr, nlh, sizeof(struct rtmsg), remaining) { + switch (nla_type(attr)) { + case RTA_DST: + cfg->fc_dst = nla_get_be32(attr); + break; + case RTA_OIF: + cfg->fc_oif = nla_get_u32(attr); + break; + case RTA_GATEWAY: + cfg->fc_gw = nla_get_be32(attr); + break; + case RTA_PRIORITY: + cfg->fc_priority = nla_get_u32(attr); + break; + case RTA_PREFSRC: + cfg->fc_prefsrc = nla_get_be32(attr); + break; + case RTA_METRICS: + cfg->fc_mx = nla_data(attr); + cfg->fc_mx_len = nla_len(attr); + break; + case RTA_MULTIPATH: + cfg->fc_mp = nla_data(attr); + cfg->fc_mp_len = nla_len(attr); + break; + case RTA_FLOW: + cfg->fc_flow = nla_get_u32(attr); + break; + case RTA_TABLE: + cfg->fc_table = nla_get_u32(attr); + break; + } + } + + return 0; +errout: + return err; +} + +static int inet_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) +{ + struct net *net = sock_net(skb->sk); + struct fib_config cfg; + struct fib_table *tb; + int err; + + err = rtm_to_fib_config(net, skb, nlh, &cfg); + if (err < 0) + goto errout; + + tb = fib_get_table(net, cfg.fc_table); + if (tb == NULL) { + err = -ESRCH; + goto errout; + } + + err = tb->tb_delete(tb, &cfg); +errout: + return err; +} + +static int inet_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) +{ + struct net *net = sock_net(skb->sk); + struct fib_config cfg; + struct fib_table *tb; + int err; + + err = rtm_to_fib_config(net, skb, nlh, &cfg); + if (err < 0) + goto errout; + + tb = fib_new_table(net, cfg.fc_table); + if (tb == NULL) { + err = -ENOBUFS; + goto errout; + } + + err = tb->tb_insert(tb, &cfg); +errout: + return err; +} + +static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct net *net = sock_net(skb->sk); + unsigned int h, s_h; + unsigned int e = 0, s_e; + struct fib_table *tb; + struct hlist_node *node; + struct hlist_head *head; + int dumped = 0; + + if (nlmsg_len(cb->nlh) >= sizeof(struct rtmsg) && + ((struct rtmsg *) nlmsg_data(cb->nlh))->rtm_flags & RTM_F_CLONED) + return ip_rt_dump(skb, cb); + + s_h = cb->args[0]; + s_e = cb->args[1]; + + for (h = s_h; h < FIB_TABLE_HASHSZ; h++, s_e = 0) { + e = 0; + head = &net->ipv4.fib_table_hash[h]; + hlist_for_each_entry(tb, node, head, tb_hlist) { + if (e < s_e) + goto next; + if (dumped) + memset(&cb->args[2], 0, sizeof(cb->args) - + 2 * sizeof(cb->args[0])); + if (tb->tb_dump(tb, skb, cb) < 0) + goto out; + dumped = 1; +next: + e++; + } + } +out: + cb->args[1] = e; + cb->args[0] = h; + + return skb->len; +} + +/* Prepare and feed intra-kernel routing request. + Really, it should be netlink message, but :-( netlink + can be not configured, so that we feed it directly + to fib engine. It is legal, because all events occur + only when netlink is already locked. + */ + +static void fib_magic(int cmd, int type, __be32 dst, int dst_len, struct in_ifaddr *ifa) +{ + struct net *net = dev_net(ifa->ifa_dev->dev); + struct fib_table *tb; + struct fib_config cfg = { + .fc_protocol = RTPROT_KERNEL, + .fc_type = type, + .fc_dst = dst, + .fc_dst_len = dst_len, + .fc_prefsrc = ifa->ifa_local, + .fc_oif = ifa->ifa_dev->dev->ifindex, + .fc_nlflags = NLM_F_CREATE | NLM_F_APPEND, + .fc_nlinfo = { + .nl_net = net, + }, + }; + + if (type == RTN_UNICAST) + tb = fib_new_table(net, RT_TABLE_MAIN); + else + tb = fib_new_table(net, RT_TABLE_LOCAL); + + if (tb == NULL) + return; + + cfg.fc_table = tb->tb_id; + + if (type != RTN_LOCAL) + cfg.fc_scope = RT_SCOPE_LINK; + else + cfg.fc_scope = RT_SCOPE_HOST; + + if (cmd == RTM_NEWROUTE) + tb->tb_insert(tb, &cfg); + else + tb->tb_delete(tb, &cfg); +} + +void fib_add_ifaddr(struct in_ifaddr *ifa) +{ + struct in_device *in_dev = ifa->ifa_dev; + struct net_device *dev = in_dev->dev; + struct in_ifaddr *prim = ifa; + __be32 mask = ifa->ifa_mask; + __be32 addr = ifa->ifa_local; + __be32 prefix = ifa->ifa_address&mask; + + if (ifa->ifa_flags&IFA_F_SECONDARY) { + prim = inet_ifa_byprefix(in_dev, prefix, mask); + if (prim == NULL) { + printk(KERN_WARNING "fib_add_ifaddr: bug: prim == NULL\n"); + return; + } + } + + fib_magic(RTM_NEWROUTE, RTN_LOCAL, addr, 32, prim); + + if (!(dev->flags&IFF_UP)) + return; + + /* Add broadcast address, if it is explicitly assigned. */ + if (ifa->ifa_broadcast && ifa->ifa_broadcast != htonl(0xFFFFFFFF)) + fib_magic(RTM_NEWROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); + + if (!ipv4_is_zeronet(prefix) && !(ifa->ifa_flags&IFA_F_SECONDARY) && + (prefix != addr || ifa->ifa_prefixlen < 32)) { + fib_magic(RTM_NEWROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : + RTN_UNICAST, prefix, ifa->ifa_prefixlen, prim); + + /* Add network specific broadcasts, when it takes a sense */ + if (ifa->ifa_prefixlen < 31) { + fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix, 32, prim); + fib_magic(RTM_NEWROUTE, RTN_BROADCAST, prefix|~mask, 32, prim); + } + } +} + +static void fib_del_ifaddr(struct in_ifaddr *ifa) +{ + struct in_device *in_dev = ifa->ifa_dev; + struct net_device *dev = in_dev->dev; + struct in_ifaddr *ifa1; + struct in_ifaddr *prim = ifa; + __be32 brd = ifa->ifa_address|~ifa->ifa_mask; + __be32 any = ifa->ifa_address&ifa->ifa_mask; +#define LOCAL_OK 1 +#define BRD_OK 2 +#define BRD0_OK 4 +#define BRD1_OK 8 + unsigned ok = 0; + + if (!(ifa->ifa_flags&IFA_F_SECONDARY)) + fib_magic(RTM_DELROUTE, dev->flags&IFF_LOOPBACK ? RTN_LOCAL : + RTN_UNICAST, any, ifa->ifa_prefixlen, prim); + else { + prim = inet_ifa_byprefix(in_dev, any, ifa->ifa_mask); + if (prim == NULL) { + printk(KERN_WARNING "fib_del_ifaddr: bug: prim == NULL\n"); + return; + } + } + + /* Deletion is more complicated than add. + We should take care of not to delete too much :-) + + Scan address list to be sure that addresses are really gone. + */ + + for (ifa1 = in_dev->ifa_list; ifa1; ifa1 = ifa1->ifa_next) { + if (ifa->ifa_local == ifa1->ifa_local) + ok |= LOCAL_OK; + if (ifa->ifa_broadcast == ifa1->ifa_broadcast) + ok |= BRD_OK; + if (brd == ifa1->ifa_broadcast) + ok |= BRD1_OK; + if (any == ifa1->ifa_broadcast) + ok |= BRD0_OK; + } + + if (!(ok&BRD_OK)) + fib_magic(RTM_DELROUTE, RTN_BROADCAST, ifa->ifa_broadcast, 32, prim); + if (!(ok&BRD1_OK)) + fib_magic(RTM_DELROUTE, RTN_BROADCAST, brd, 32, prim); + if (!(ok&BRD0_OK)) + fib_magic(RTM_DELROUTE, RTN_BROADCAST, any, 32, prim); + if (!(ok&LOCAL_OK)) { + fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 32, prim); + + /* Check, that this local address finally disappeared. */ + if (inet_addr_type(dev_net(dev), ifa->ifa_local) != RTN_LOCAL) { + /* And the last, but not the least thing. + We must flush stray FIB entries. + + First of all, we scan fib_info list searching + for stray nexthop entries, then ignite fib_flush. + */ + if (fib_sync_down_addr(dev_net(dev), ifa->ifa_local)) + fib_flush(dev_net(dev)); + } + } +#undef LOCAL_OK +#undef BRD_OK +#undef BRD0_OK +#undef BRD1_OK +} + +static void nl_fib_lookup(struct fib_result_nl *frn, struct fib_table *tb ) +{ + + struct fib_result res; + struct flowi fl = { .mark = frn->fl_mark, + .nl_u = { .ip4_u = { .daddr = frn->fl_addr, + .tos = frn->fl_tos, + .scope = frn->fl_scope } } }; + +#ifdef CONFIG_IP_MULTIPLE_TABLES + res.r = NULL; +#endif + + frn->err = -ENOENT; + if (tb) { + local_bh_disable(); + + frn->tb_id = tb->tb_id; + frn->err = tb->tb_lookup(tb, &fl, &res); + + if (!frn->err) { + frn->prefixlen = res.prefixlen; + frn->nh_sel = res.nh_sel; + frn->type = res.type; + frn->scope = res.scope; + fib_res_put(&res); + } + local_bh_enable(); + } +} + +static void nl_fib_input(struct sk_buff *skb) +{ + struct net *net; + struct fib_result_nl *frn; + struct nlmsghdr *nlh; + struct fib_table *tb; + u32 pid; + + net = sock_net(skb->sk); + nlh = nlmsg_hdr(skb); + if (skb->len < NLMSG_SPACE(0) || skb->len < nlh->nlmsg_len || + nlh->nlmsg_len < NLMSG_LENGTH(sizeof(*frn))) + return; + + skb = skb_clone(skb, GFP_KERNEL); + if (skb == NULL) + return; + nlh = nlmsg_hdr(skb); + + frn = (struct fib_result_nl *) NLMSG_DATA(nlh); + tb = fib_get_table(net, frn->tb_id_in); + + nl_fib_lookup(frn, tb); + + pid = NETLINK_CB(skb).pid; /* pid of sending process */ + NETLINK_CB(skb).pid = 0; /* from kernel */ + NETLINK_CB(skb).dst_group = 0; /* unicast */ + netlink_unicast(net->ipv4.fibnl, skb, pid, MSG_DONTWAIT); +} + +static int nl_fib_lookup_init(struct net *net) +{ + struct sock *sk; + sk = netlink_kernel_create(net, NETLINK_FIB_LOOKUP, 0, + nl_fib_input, NULL, THIS_MODULE); + if (sk == NULL) + return -EAFNOSUPPORT; + net->ipv4.fibnl = sk; + return 0; +} + +static void nl_fib_lookup_exit(struct net *net) +{ + netlink_kernel_release(net->ipv4.fibnl); + net->ipv4.fibnl = NULL; +} + +static void fib_disable_ip(struct net_device *dev, int force) +{ + if (fib_sync_down_dev(dev, force)) + fib_flush(dev_net(dev)); + rt_cache_flush(dev_net(dev), 0); + arp_ifdown(dev); +} + +static int fib_inetaddr_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + struct in_ifaddr *ifa = (struct in_ifaddr*)ptr; + struct net_device *dev = ifa->ifa_dev->dev; + + switch (event) { + case NETDEV_UP: + fib_add_ifaddr(ifa); +#ifdef CONFIG_IP_ROUTE_MULTIPATH + fib_sync_up(dev); +#endif + rt_cache_flush(dev_net(dev), -1); + break; + case NETDEV_DOWN: + fib_del_ifaddr(ifa); + if (ifa->ifa_dev->ifa_list == NULL) { + /* Last address was deleted from this interface. + Disable IP. + */ + fib_disable_ip(dev, 1); + } else { + rt_cache_flush(dev_net(dev), -1); + } + break; + } + return NOTIFY_DONE; +} + +static int fib_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) +{ + struct net_device *dev = ptr; + struct in_device *in_dev = __in_dev_get_rtnl(dev); + + if (event == NETDEV_UNREGISTER) { + fib_disable_ip(dev, 2); + return NOTIFY_DONE; + } + + if (!in_dev) + return NOTIFY_DONE; + + switch (event) { + case NETDEV_UP: + for_ifa(in_dev) { + fib_add_ifaddr(ifa); + } endfor_ifa(in_dev); +#ifdef CONFIG_IP_ROUTE_MULTIPATH + fib_sync_up(dev); +#endif + rt_cache_flush(dev_net(dev), -1); + break; + case NETDEV_DOWN: + fib_disable_ip(dev, 0); + break; + case NETDEV_CHANGEMTU: + case NETDEV_CHANGE: + rt_cache_flush(dev_net(dev), 0); + break; + } + return NOTIFY_DONE; +} + +static struct notifier_block fib_inetaddr_notifier = { + .notifier_call =fib_inetaddr_event, +}; + +static struct notifier_block fib_netdev_notifier = { + .notifier_call =fib_netdev_event, +}; + +static int __net_init ip_fib_net_init(struct net *net) +{ + int err; + unsigned int i; + + net->ipv4.fib_table_hash = kzalloc( + sizeof(struct hlist_head)*FIB_TABLE_HASHSZ, GFP_KERNEL); + if (net->ipv4.fib_table_hash == NULL) + return -ENOMEM; + + for (i = 0; i < FIB_TABLE_HASHSZ; i++) + INIT_HLIST_HEAD(&net->ipv4.fib_table_hash[i]); + + err = fib4_rules_init(net); + if (err < 0) + goto fail; + return 0; + +fail: + kfree(net->ipv4.fib_table_hash); + return err; +} + +static void __net_exit ip_fib_net_exit(struct net *net) +{ + unsigned int i; + +#ifdef CONFIG_IP_MULTIPLE_TABLES + fib4_rules_exit(net); +#endif + + for (i = 0; i < FIB_TABLE_HASHSZ; i++) { + struct fib_table *tb; + struct hlist_head *head; + struct hlist_node *node, *tmp; + + head = &net->ipv4.fib_table_hash[i]; + hlist_for_each_entry_safe(tb, node, tmp, head, tb_hlist) { + hlist_del(node); + tb->tb_flush(tb); + kfree(tb); + } + } + kfree(net->ipv4.fib_table_hash); +} + +static int __net_init fib_net_init(struct net *net) +{ + int error; + + error = ip_fib_net_init(net); + if (error < 0) + goto out; + error = nl_fib_lookup_init(net); + if (error < 0) + goto out_nlfl; + error = fib_proc_init(net); + if (error < 0) + goto out_proc; +out: + return error; + +out_proc: + nl_fib_lookup_exit(net); +out_nlfl: + ip_fib_net_exit(net); + goto out; +} + +static void __net_exit fib_net_exit(struct net *net) +{ + fib_proc_exit(net); + nl_fib_lookup_exit(net); + ip_fib_net_exit(net); +} + +static struct pernet_operations fib_net_ops = { + .init = fib_net_init, + .exit = fib_net_exit, +}; + +void __init ip_fib_init(void) +{ + rtnl_register(PF_INET, RTM_NEWROUTE, inet_rtm_newroute, NULL); + rtnl_register(PF_INET, RTM_DELROUTE, inet_rtm_delroute, NULL); + rtnl_register(PF_INET, RTM_GETROUTE, NULL, inet_dump_fib); + + register_pernet_subsys(&fib_net_ops); + register_netdevice_notifier(&fib_netdev_notifier); + register_inetaddr_notifier(&fib_inetaddr_notifier); + + fib_hash_init(); +} + +EXPORT_SYMBOL(inet_addr_type); +EXPORT_SYMBOL(inet_dev_addr_type); +EXPORT_SYMBOL(ip_dev_find); |
