| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * XFRM virtual interface |
| * |
| * Copyright (C) 2018 secunet Security Networks AG |
| * |
| * Author: |
| * Steffen Klassert <steffen.klassert@secunet.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/sockios.h> |
| #include <linux/icmp.h> |
| #include <linux/if.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/net.h> |
| #include <linux/in6.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_link.h> |
| #include <linux/if_arp.h> |
| #include <linux/icmpv6.h> |
| #include <linux/init.h> |
| #include <linux/route.h> |
| #include <linux/rtnetlink.h> |
| #include <linux/netfilter_ipv6.h> |
| #include <linux/slab.h> |
| #include <linux/hash.h> |
| |
| #include <linux/uaccess.h> |
| #include <linux/atomic.h> |
| |
| #include <net/icmp.h> |
| #include <net/ip.h> |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <net/addrconf.h> |
| #include <net/xfrm.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| #include <linux/etherdevice.h> |
| |
| static int xfrmi_dev_init(struct net_device *dev); |
| static void xfrmi_dev_setup(struct net_device *dev); |
| static struct rtnl_link_ops xfrmi_link_ops __read_mostly; |
| static unsigned int xfrmi_net_id __read_mostly; |
| |
| struct xfrmi_net { |
| /* lists for storing interfaces in use */ |
| struct xfrm_if __rcu *xfrmi[1]; |
| }; |
| |
| #define for_each_xfrmi_rcu(start, xi) \ |
| for (xi = rcu_dereference(start); xi; xi = rcu_dereference(xi->next)) |
| |
| static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x) |
| { |
| struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| struct xfrm_if *xi; |
| |
| for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { |
| if (x->if_id == xi->p.if_id && |
| (xi->dev->flags & IFF_UP)) |
| return xi; |
| } |
| |
| return NULL; |
| } |
| |
| static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb, |
| unsigned short family) |
| { |
| struct xfrmi_net *xfrmn; |
| struct xfrm_if *xi; |
| int ifindex = 0; |
| |
| if (!secpath_exists(skb) || !skb->dev) |
| return NULL; |
| |
| switch (family) { |
| case AF_INET6: |
| ifindex = inet6_sdif(skb); |
| break; |
| case AF_INET: |
| ifindex = inet_sdif(skb); |
| break; |
| } |
| if (!ifindex) |
| ifindex = skb->dev->ifindex; |
| |
| xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id); |
| |
| for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) { |
| if (ifindex == xi->dev->ifindex && |
| (xi->dev->flags & IFF_UP)) |
| return xi; |
| } |
| |
| return NULL; |
| } |
| |
| static void xfrmi_link(struct xfrmi_net *xfrmn, struct xfrm_if *xi) |
| { |
| struct xfrm_if __rcu **xip = &xfrmn->xfrmi[0]; |
| |
| rcu_assign_pointer(xi->next , rtnl_dereference(*xip)); |
| rcu_assign_pointer(*xip, xi); |
| } |
| |
| static void xfrmi_unlink(struct xfrmi_net *xfrmn, struct xfrm_if *xi) |
| { |
| struct xfrm_if __rcu **xip; |
| struct xfrm_if *iter; |
| |
| for (xip = &xfrmn->xfrmi[0]; |
| (iter = rtnl_dereference(*xip)) != NULL; |
| xip = &iter->next) { |
| if (xi == iter) { |
| rcu_assign_pointer(*xip, xi->next); |
| break; |
| } |
| } |
| } |
| |
| static void xfrmi_dev_free(struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| |
| gro_cells_destroy(&xi->gro_cells); |
| free_percpu(dev->tstats); |
| } |
| |
| static int xfrmi_create2(struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| struct net *net = dev_net(dev); |
| struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| int err; |
| |
| dev->rtnl_link_ops = &xfrmi_link_ops; |
| err = register_netdevice(dev); |
| if (err < 0) |
| goto out; |
| |
| strcpy(xi->p.name, dev->name); |
| |
| dev_hold(dev); |
| xfrmi_link(xfrmn, xi); |
| |
| return 0; |
| |
| out: |
| return err; |
| } |
| |
| static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p) |
| { |
| struct net_device *dev; |
| struct xfrm_if *xi; |
| char name[IFNAMSIZ]; |
| int err; |
| |
| if (p->name[0]) { |
| strlcpy(name, p->name, IFNAMSIZ); |
| } else { |
| err = -EINVAL; |
| goto failed; |
| } |
| |
| dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup); |
| if (!dev) { |
| err = -EAGAIN; |
| goto failed; |
| } |
| |
| dev_net_set(dev, net); |
| |
| xi = netdev_priv(dev); |
| xi->p = *p; |
| xi->net = net; |
| xi->dev = dev; |
| xi->phydev = dev_get_by_index(net, p->link); |
| if (!xi->phydev) { |
| err = -ENODEV; |
| goto failed_free; |
| } |
| |
| err = xfrmi_create2(dev); |
| if (err < 0) |
| goto failed_dev_put; |
| |
| return xi; |
| |
| failed_dev_put: |
| dev_put(xi->phydev); |
| failed_free: |
| free_netdev(dev); |
| failed: |
| return ERR_PTR(err); |
| } |
| |
| static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p, |
| int create) |
| { |
| struct xfrm_if __rcu **xip; |
| struct xfrm_if *xi; |
| struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| |
| for (xip = &xfrmn->xfrmi[0]; |
| (xi = rtnl_dereference(*xip)) != NULL; |
| xip = &xi->next) { |
| if (xi->p.if_id == p->if_id) { |
| if (create) |
| return ERR_PTR(-EEXIST); |
| |
| return xi; |
| } |
| } |
| if (!create) |
| return ERR_PTR(-ENODEV); |
| return xfrmi_create(net, p); |
| } |
| |
| static void xfrmi_dev_uninit(struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| struct xfrmi_net *xfrmn = net_generic(xi->net, xfrmi_net_id); |
| |
| xfrmi_unlink(xfrmn, xi); |
| dev_put(xi->phydev); |
| dev_put(dev); |
| } |
| |
| static void xfrmi_scrub_packet(struct sk_buff *skb, bool xnet) |
| { |
| skb->tstamp = 0; |
| skb->pkt_type = PACKET_HOST; |
| skb->skb_iif = 0; |
| skb->ignore_df = 0; |
| skb_dst_drop(skb); |
| nf_reset(skb); |
| nf_reset_trace(skb); |
| |
| if (!xnet) |
| return; |
| |
| ipvs_reset(skb); |
| secpath_reset(skb); |
| skb_orphan(skb); |
| skb->mark = 0; |
| } |
| |
| static int xfrmi_rcv_cb(struct sk_buff *skb, int err) |
| { |
| const struct xfrm_mode *inner_mode; |
| struct pcpu_sw_netstats *tstats; |
| struct net_device *dev; |
| struct xfrm_state *x; |
| struct xfrm_if *xi; |
| bool xnet; |
| |
| if (err && !secpath_exists(skb)) |
| return 0; |
| |
| x = xfrm_input_state(skb); |
| |
| xi = xfrmi_lookup(xs_net(x), x); |
| if (!xi) |
| return 1; |
| |
| dev = xi->dev; |
| skb->dev = dev; |
| |
| if (err) { |
| dev->stats.rx_errors++; |
| dev->stats.rx_dropped++; |
| |
| return 0; |
| } |
| |
| xnet = !net_eq(xi->net, dev_net(skb->dev)); |
| |
| if (xnet) { |
| inner_mode = &x->inner_mode; |
| |
| if (x->sel.family == AF_UNSPEC) { |
| inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
| if (inner_mode == NULL) { |
| XFRM_INC_STATS(dev_net(skb->dev), |
| LINUX_MIB_XFRMINSTATEMODEERROR); |
| return -EINVAL; |
| } |
| } |
| |
| if (!xfrm_policy_check(NULL, XFRM_POLICY_IN, skb, |
| inner_mode->family)) |
| return -EPERM; |
| } |
| |
| xfrmi_scrub_packet(skb, xnet); |
| |
| tstats = this_cpu_ptr(dev->tstats); |
| |
| u64_stats_update_begin(&tstats->syncp); |
| tstats->rx_packets++; |
| tstats->rx_bytes += skb->len; |
| u64_stats_update_end(&tstats->syncp); |
| |
| return 0; |
| } |
| |
| static int |
| xfrmi_xmit2(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| struct net_device_stats *stats = &xi->dev->stats; |
| struct dst_entry *dst = skb_dst(skb); |
| unsigned int length = skb->len; |
| struct net_device *tdev; |
| struct xfrm_state *x; |
| int err = -1; |
| int mtu; |
| |
| if (!dst) |
| goto tx_err_link_failure; |
| |
| dst_hold(dst); |
| dst = xfrm_lookup_with_ifid(xi->net, dst, fl, NULL, 0, xi->p.if_id); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| dst = NULL; |
| goto tx_err_link_failure; |
| } |
| |
| x = dst->xfrm; |
| if (!x) |
| goto tx_err_link_failure; |
| |
| if (x->if_id != xi->p.if_id) |
| goto tx_err_link_failure; |
| |
| tdev = dst->dev; |
| |
| if (tdev == dev) { |
| stats->collisions++; |
| net_warn_ratelimited("%s: Local routing loop detected!\n", |
| xi->p.name); |
| goto tx_err_dst_release; |
| } |
| |
| mtu = dst_mtu(dst); |
| if (!skb->ignore_df && skb->len > mtu) { |
| skb_dst_update_pmtu(skb, mtu); |
| |
| if (skb->protocol == htons(ETH_P_IPV6)) { |
| if (mtu < IPV6_MIN_MTU) |
| mtu = IPV6_MIN_MTU; |
| |
| icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
| } else { |
| icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, |
| htonl(mtu)); |
| } |
| |
| dst_release(dst); |
| return -EMSGSIZE; |
| } |
| |
| xfrmi_scrub_packet(skb, !net_eq(xi->net, dev_net(dev))); |
| skb_dst_set(skb, dst); |
| skb->dev = tdev; |
| |
| err = dst_output(xi->net, skb->sk, skb); |
| if (net_xmit_eval(err) == 0) { |
| struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats); |
| |
| u64_stats_update_begin(&tstats->syncp); |
| tstats->tx_bytes += length; |
| tstats->tx_packets++; |
| u64_stats_update_end(&tstats->syncp); |
| } else { |
| stats->tx_errors++; |
| stats->tx_aborted_errors++; |
| } |
| |
| return 0; |
| tx_err_link_failure: |
| stats->tx_carrier_errors++; |
| dst_link_failure(skb); |
| tx_err_dst_release: |
| dst_release(dst); |
| return err; |
| } |
| |
| static netdev_tx_t xfrmi_xmit(struct sk_buff *skb, struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| struct net_device_stats *stats = &xi->dev->stats; |
| struct flowi fl; |
| int ret; |
| |
| memset(&fl, 0, sizeof(fl)); |
| |
| switch (skb->protocol) { |
| case htons(ETH_P_IPV6): |
| xfrm_decode_session(skb, &fl, AF_INET6); |
| memset(IP6CB(skb), 0, sizeof(*IP6CB(skb))); |
| break; |
| case htons(ETH_P_IP): |
| xfrm_decode_session(skb, &fl, AF_INET); |
| memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
| break; |
| default: |
| goto tx_err; |
| } |
| |
| fl.flowi_oif = xi->phydev->ifindex; |
| |
| ret = xfrmi_xmit2(skb, dev, &fl); |
| if (ret < 0) |
| goto tx_err; |
| |
| return NETDEV_TX_OK; |
| |
| tx_err: |
| stats->tx_errors++; |
| stats->tx_dropped++; |
| kfree_skb(skb); |
| return NETDEV_TX_OK; |
| } |
| |
| static int xfrmi4_err(struct sk_buff *skb, u32 info) |
| { |
| const struct iphdr *iph = (const struct iphdr *)skb->data; |
| struct net *net = dev_net(skb->dev); |
| int protocol = iph->protocol; |
| struct ip_comp_hdr *ipch; |
| struct ip_esp_hdr *esph; |
| struct ip_auth_hdr *ah ; |
| struct xfrm_state *x; |
| struct xfrm_if *xi; |
| __be32 spi; |
| |
| switch (protocol) { |
| case IPPROTO_ESP: |
| esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2)); |
| spi = esph->spi; |
| break; |
| case IPPROTO_AH: |
| ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2)); |
| spi = ah->spi; |
| break; |
| case IPPROTO_COMP: |
| ipch = (struct ip_comp_hdr *)(skb->data+(iph->ihl<<2)); |
| spi = htonl(ntohs(ipch->cpi)); |
| break; |
| default: |
| return 0; |
| } |
| |
| switch (icmp_hdr(skb)->type) { |
| case ICMP_DEST_UNREACH: |
| if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED) |
| return 0; |
| case ICMP_REDIRECT: |
| break; |
| default: |
| return 0; |
| } |
| |
| x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
| spi, protocol, AF_INET); |
| if (!x) |
| return 0; |
| |
| xi = xfrmi_lookup(net, x); |
| if (!xi) { |
| xfrm_state_put(x); |
| return -1; |
| } |
| |
| if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH) |
| ipv4_update_pmtu(skb, net, info, 0, protocol); |
| else |
| ipv4_redirect(skb, net, 0, protocol); |
| xfrm_state_put(x); |
| |
| return 0; |
| } |
| |
| static int xfrmi6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info) |
| { |
| const struct ipv6hdr *iph = (const struct ipv6hdr *)skb->data; |
| struct net *net = dev_net(skb->dev); |
| int protocol = iph->nexthdr; |
| struct ip_comp_hdr *ipch; |
| struct ip_esp_hdr *esph; |
| struct ip_auth_hdr *ah; |
| struct xfrm_state *x; |
| struct xfrm_if *xi; |
| __be32 spi; |
| |
| switch (protocol) { |
| case IPPROTO_ESP: |
| esph = (struct ip_esp_hdr *)(skb->data + offset); |
| spi = esph->spi; |
| break; |
| case IPPROTO_AH: |
| ah = (struct ip_auth_hdr *)(skb->data + offset); |
| spi = ah->spi; |
| break; |
| case IPPROTO_COMP: |
| ipch = (struct ip_comp_hdr *)(skb->data + offset); |
| spi = htonl(ntohs(ipch->cpi)); |
| break; |
| default: |
| return 0; |
| } |
| |
| if (type != ICMPV6_PKT_TOOBIG && |
| type != NDISC_REDIRECT) |
| return 0; |
| |
| x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr, |
| spi, protocol, AF_INET6); |
| if (!x) |
| return 0; |
| |
| xi = xfrmi_lookup(net, x); |
| if (!xi) { |
| xfrm_state_put(x); |
| return -1; |
| } |
| |
| if (type == NDISC_REDIRECT) |
| ip6_redirect(skb, net, skb->dev->ifindex, 0, |
| sock_net_uid(net, NULL)); |
| else |
| ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL)); |
| xfrm_state_put(x); |
| |
| return 0; |
| } |
| |
| static int xfrmi_change(struct xfrm_if *xi, const struct xfrm_if_parms *p) |
| { |
| if (xi->p.link != p->link) |
| return -EINVAL; |
| |
| xi->p.if_id = p->if_id; |
| |
| return 0; |
| } |
| |
| static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p) |
| { |
| struct net *net = dev_net(xi->dev); |
| struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| int err; |
| |
| xfrmi_unlink(xfrmn, xi); |
| synchronize_net(); |
| err = xfrmi_change(xi, p); |
| xfrmi_link(xfrmn, xi); |
| netdev_state_change(xi->dev); |
| return err; |
| } |
| |
| static void xfrmi_get_stats64(struct net_device *dev, |
| struct rtnl_link_stats64 *s) |
| { |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| struct pcpu_sw_netstats *stats; |
| struct pcpu_sw_netstats tmp; |
| int start; |
| |
| stats = per_cpu_ptr(dev->tstats, cpu); |
| do { |
| start = u64_stats_fetch_begin_irq(&stats->syncp); |
| tmp.rx_packets = stats->rx_packets; |
| tmp.rx_bytes = stats->rx_bytes; |
| tmp.tx_packets = stats->tx_packets; |
| tmp.tx_bytes = stats->tx_bytes; |
| } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
| |
| s->rx_packets += tmp.rx_packets; |
| s->rx_bytes += tmp.rx_bytes; |
| s->tx_packets += tmp.tx_packets; |
| s->tx_bytes += tmp.tx_bytes; |
| } |
| |
| s->rx_dropped = dev->stats.rx_dropped; |
| s->tx_dropped = dev->stats.tx_dropped; |
| } |
| |
| static int xfrmi_get_iflink(const struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| |
| return xi->phydev->ifindex; |
| } |
| |
| |
| static const struct net_device_ops xfrmi_netdev_ops = { |
| .ndo_init = xfrmi_dev_init, |
| .ndo_uninit = xfrmi_dev_uninit, |
| .ndo_start_xmit = xfrmi_xmit, |
| .ndo_get_stats64 = xfrmi_get_stats64, |
| .ndo_get_iflink = xfrmi_get_iflink, |
| }; |
| |
| static void xfrmi_dev_setup(struct net_device *dev) |
| { |
| dev->netdev_ops = &xfrmi_netdev_ops; |
| dev->type = ARPHRD_NONE; |
| dev->hard_header_len = ETH_HLEN; |
| dev->min_header_len = ETH_HLEN; |
| dev->mtu = ETH_DATA_LEN; |
| dev->min_mtu = ETH_MIN_MTU; |
| dev->max_mtu = ETH_DATA_LEN; |
| dev->addr_len = ETH_ALEN; |
| dev->flags = IFF_NOARP; |
| dev->needs_free_netdev = true; |
| dev->priv_destructor = xfrmi_dev_free; |
| netif_keep_dst(dev); |
| } |
| |
| static int xfrmi_dev_init(struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| struct net_device *phydev = xi->phydev; |
| int err; |
| |
| dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| if (!dev->tstats) |
| return -ENOMEM; |
| |
| err = gro_cells_init(&xi->gro_cells, dev); |
| if (err) { |
| free_percpu(dev->tstats); |
| return err; |
| } |
| |
| dev->features |= NETIF_F_LLTX; |
| |
| dev->needed_headroom = phydev->needed_headroom; |
| dev->needed_tailroom = phydev->needed_tailroom; |
| |
| if (is_zero_ether_addr(dev->dev_addr)) |
| eth_hw_addr_inherit(dev, phydev); |
| if (is_zero_ether_addr(dev->broadcast)) |
| memcpy(dev->broadcast, phydev->broadcast, dev->addr_len); |
| |
| return 0; |
| } |
| |
| static int xfrmi_validate(struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| return 0; |
| } |
| |
| static void xfrmi_netlink_parms(struct nlattr *data[], |
| struct xfrm_if_parms *parms) |
| { |
| memset(parms, 0, sizeof(*parms)); |
| |
| if (!data) |
| return; |
| |
| if (data[IFLA_XFRM_LINK]) |
| parms->link = nla_get_u32(data[IFLA_XFRM_LINK]); |
| |
| if (data[IFLA_XFRM_IF_ID]) |
| parms->if_id = nla_get_u32(data[IFLA_XFRM_IF_ID]); |
| } |
| |
| static int xfrmi_newlink(struct net *src_net, struct net_device *dev, |
| struct nlattr *tb[], struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct net *net = dev_net(dev); |
| struct xfrm_if_parms *p; |
| struct xfrm_if *xi; |
| |
| xi = netdev_priv(dev); |
| p = &xi->p; |
| |
| xfrmi_netlink_parms(data, p); |
| |
| if (!tb[IFLA_IFNAME]) |
| return -EINVAL; |
| |
| nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ); |
| |
| xi = xfrmi_locate(net, p, 1); |
| return PTR_ERR_OR_ZERO(xi); |
| } |
| |
| static void xfrmi_dellink(struct net_device *dev, struct list_head *head) |
| { |
| unregister_netdevice_queue(dev, head); |
| } |
| |
| static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], |
| struct nlattr *data[], |
| struct netlink_ext_ack *extack) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| struct net *net = dev_net(dev); |
| |
| xfrmi_netlink_parms(data, &xi->p); |
| |
| xi = xfrmi_locate(net, &xi->p, 0); |
| |
| if (IS_ERR_OR_NULL(xi)) { |
| xi = netdev_priv(dev); |
| } else { |
| if (xi->dev != dev) |
| return -EEXIST; |
| } |
| |
| return xfrmi_update(xi, &xi->p); |
| } |
| |
| static size_t xfrmi_get_size(const struct net_device *dev) |
| { |
| return |
| /* IFLA_XFRM_LINK */ |
| nla_total_size(4) + |
| /* IFLA_XFRM_IF_ID */ |
| nla_total_size(4) + |
| 0; |
| } |
| |
| static int xfrmi_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| struct xfrm_if_parms *parm = &xi->p; |
| |
| if (nla_put_u32(skb, IFLA_XFRM_LINK, parm->link) || |
| nla_put_u32(skb, IFLA_XFRM_IF_ID, parm->if_id)) |
| goto nla_put_failure; |
| return 0; |
| |
| nla_put_failure: |
| return -EMSGSIZE; |
| } |
| |
| static struct net *xfrmi_get_link_net(const struct net_device *dev) |
| { |
| struct xfrm_if *xi = netdev_priv(dev); |
| |
| return dev_net(xi->phydev); |
| } |
| |
| static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = { |
| [IFLA_XFRM_LINK] = { .type = NLA_U32 }, |
| [IFLA_XFRM_IF_ID] = { .type = NLA_U32 }, |
| }; |
| |
| static struct rtnl_link_ops xfrmi_link_ops __read_mostly = { |
| .kind = "xfrm", |
| .maxtype = IFLA_XFRM_MAX, |
| .policy = xfrmi_policy, |
| .priv_size = sizeof(struct xfrm_if), |
| .setup = xfrmi_dev_setup, |
| .validate = xfrmi_validate, |
| .newlink = xfrmi_newlink, |
| .dellink = xfrmi_dellink, |
| .changelink = xfrmi_changelink, |
| .get_size = xfrmi_get_size, |
| .fill_info = xfrmi_fill_info, |
| .get_link_net = xfrmi_get_link_net, |
| }; |
| |
| static void __net_exit xfrmi_destroy_interfaces(struct xfrmi_net *xfrmn) |
| { |
| struct xfrm_if *xi; |
| LIST_HEAD(list); |
| |
| xi = rtnl_dereference(xfrmn->xfrmi[0]); |
| if (!xi) |
| return; |
| |
| unregister_netdevice_queue(xi->dev, &list); |
| unregister_netdevice_many(&list); |
| } |
| |
| static int __net_init xfrmi_init_net(struct net *net) |
| { |
| return 0; |
| } |
| |
| static void __net_exit xfrmi_exit_net(struct net *net) |
| { |
| struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id); |
| |
| rtnl_lock(); |
| xfrmi_destroy_interfaces(xfrmn); |
| rtnl_unlock(); |
| } |
| |
| static struct pernet_operations xfrmi_net_ops = { |
| .init = xfrmi_init_net, |
| .exit = xfrmi_exit_net, |
| .id = &xfrmi_net_id, |
| .size = sizeof(struct xfrmi_net), |
| }; |
| |
| static struct xfrm6_protocol xfrmi_esp6_protocol __read_mostly = { |
| .handler = xfrm6_rcv, |
| .cb_handler = xfrmi_rcv_cb, |
| .err_handler = xfrmi6_err, |
| .priority = 10, |
| }; |
| |
| static struct xfrm6_protocol xfrmi_ah6_protocol __read_mostly = { |
| .handler = xfrm6_rcv, |
| .cb_handler = xfrmi_rcv_cb, |
| .err_handler = xfrmi6_err, |
| .priority = 10, |
| }; |
| |
| static struct xfrm6_protocol xfrmi_ipcomp6_protocol __read_mostly = { |
| .handler = xfrm6_rcv, |
| .cb_handler = xfrmi_rcv_cb, |
| .err_handler = xfrmi6_err, |
| .priority = 10, |
| }; |
| |
| static struct xfrm4_protocol xfrmi_esp4_protocol __read_mostly = { |
| .handler = xfrm4_rcv, |
| .input_handler = xfrm_input, |
| .cb_handler = xfrmi_rcv_cb, |
| .err_handler = xfrmi4_err, |
| .priority = 10, |
| }; |
| |
| static struct xfrm4_protocol xfrmi_ah4_protocol __read_mostly = { |
| .handler = xfrm4_rcv, |
| .input_handler = xfrm_input, |
| .cb_handler = xfrmi_rcv_cb, |
| .err_handler = xfrmi4_err, |
| .priority = 10, |
| }; |
| |
| static struct xfrm4_protocol xfrmi_ipcomp4_protocol __read_mostly = { |
| .handler = xfrm4_rcv, |
| .input_handler = xfrm_input, |
| .cb_handler = xfrmi_rcv_cb, |
| .err_handler = xfrmi4_err, |
| .priority = 10, |
| }; |
| |
| static int __init xfrmi4_init(void) |
| { |
| int err; |
| |
| err = xfrm4_protocol_register(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| if (err < 0) |
| goto xfrm_proto_esp_failed; |
| err = xfrm4_protocol_register(&xfrmi_ah4_protocol, IPPROTO_AH); |
| if (err < 0) |
| goto xfrm_proto_ah_failed; |
| err = xfrm4_protocol_register(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); |
| if (err < 0) |
| goto xfrm_proto_comp_failed; |
| |
| return 0; |
| |
| xfrm_proto_comp_failed: |
| xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); |
| xfrm_proto_ah_failed: |
| xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| xfrm_proto_esp_failed: |
| return err; |
| } |
| |
| static void xfrmi4_fini(void) |
| { |
| xfrm4_protocol_deregister(&xfrmi_ipcomp4_protocol, IPPROTO_COMP); |
| xfrm4_protocol_deregister(&xfrmi_ah4_protocol, IPPROTO_AH); |
| xfrm4_protocol_deregister(&xfrmi_esp4_protocol, IPPROTO_ESP); |
| } |
| |
| static int __init xfrmi6_init(void) |
| { |
| int err; |
| |
| err = xfrm6_protocol_register(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| if (err < 0) |
| goto xfrm_proto_esp_failed; |
| err = xfrm6_protocol_register(&xfrmi_ah6_protocol, IPPROTO_AH); |
| if (err < 0) |
| goto xfrm_proto_ah_failed; |
| err = xfrm6_protocol_register(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); |
| if (err < 0) |
| goto xfrm_proto_comp_failed; |
| |
| return 0; |
| |
| xfrm_proto_comp_failed: |
| xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); |
| xfrm_proto_ah_failed: |
| xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| xfrm_proto_esp_failed: |
| return err; |
| } |
| |
| static void xfrmi6_fini(void) |
| { |
| xfrm6_protocol_deregister(&xfrmi_ipcomp6_protocol, IPPROTO_COMP); |
| xfrm6_protocol_deregister(&xfrmi_ah6_protocol, IPPROTO_AH); |
| xfrm6_protocol_deregister(&xfrmi_esp6_protocol, IPPROTO_ESP); |
| } |
| |
| static const struct xfrm_if_cb xfrm_if_cb = { |
| .decode_session = xfrmi_decode_session, |
| }; |
| |
| static int __init xfrmi_init(void) |
| { |
| const char *msg; |
| int err; |
| |
| pr_info("IPsec XFRM device driver\n"); |
| |
| msg = "tunnel device"; |
| err = register_pernet_device(&xfrmi_net_ops); |
| if (err < 0) |
| goto pernet_dev_failed; |
| |
| msg = "xfrm4 protocols"; |
| err = xfrmi4_init(); |
| if (err < 0) |
| goto xfrmi4_failed; |
| |
| msg = "xfrm6 protocols"; |
| err = xfrmi6_init(); |
| if (err < 0) |
| goto xfrmi6_failed; |
| |
| |
| msg = "netlink interface"; |
| err = rtnl_link_register(&xfrmi_link_ops); |
| if (err < 0) |
| goto rtnl_link_failed; |
| |
| xfrm_if_register_cb(&xfrm_if_cb); |
| |
| return err; |
| |
| rtnl_link_failed: |
| xfrmi6_fini(); |
| xfrmi6_failed: |
| xfrmi4_fini(); |
| xfrmi4_failed: |
| unregister_pernet_device(&xfrmi_net_ops); |
| pernet_dev_failed: |
| pr_err("xfrmi init: failed to register %s\n", msg); |
| return err; |
| } |
| |
| static void __exit xfrmi_fini(void) |
| { |
| xfrm_if_unregister_cb(); |
| rtnl_link_unregister(&xfrmi_link_ops); |
| xfrmi4_fini(); |
| xfrmi6_fini(); |
| unregister_pernet_device(&xfrmi_net_ops); |
| } |
| |
| module_init(xfrmi_init); |
| module_exit(xfrmi_fini); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_RTNL_LINK("xfrm"); |
| MODULE_ALIAS_NETDEV("xfrm0"); |
| MODULE_AUTHOR("Steffen Klassert"); |
| MODULE_DESCRIPTION("XFRM virtual interface"); |