10189197fSEric W. Biederman #include <linux/types.h> 20189197fSEric W. Biederman #include <linux/skbuff.h> 30189197fSEric W. Biederman #include <linux/socket.h> 47720c01fSEric W. Biederman #include <linux/sysctl.h> 50189197fSEric W. Biederman #include <linux/net.h> 60189197fSEric W. Biederman #include <linux/module.h> 70189197fSEric W. Biederman #include <linux/if_arp.h> 80189197fSEric W. Biederman #include <linux/ipv6.h> 90189197fSEric W. Biederman #include <linux/mpls.h> 104b5edb2fSStephen Rothwell #include <linux/vmalloc.h> 110189197fSEric W. Biederman #include <net/ip.h> 120189197fSEric W. Biederman #include <net/dst.h> 130189197fSEric W. Biederman #include <net/sock.h> 140189197fSEric W. Biederman #include <net/arp.h> 150189197fSEric W. Biederman #include <net/ip_fib.h> 160189197fSEric W. Biederman #include <net/netevent.h> 170189197fSEric W. Biederman #include <net/netns/generic.h> 18bf21563aSRoopa Prabhu #if IS_ENABLED(CONFIG_IPV6) 19bf21563aSRoopa Prabhu #include <net/ipv6.h> 20bf21563aSRoopa Prabhu #include <net/addrconf.h> 21bf21563aSRoopa Prabhu #endif 22f8efb73cSRoopa Prabhu #include <net/nexthop.h> 230189197fSEric W. Biederman #include "internal.h" 240189197fSEric W. Biederman 251c78efa8SRobert Shearman /* Maximum number of labels to look ahead at when selecting a path of 261c78efa8SRobert Shearman * a multipath route 271c78efa8SRobert Shearman */ 281c78efa8SRobert Shearman #define MAX_MP_SELECT_LABELS 4 291c78efa8SRobert Shearman 307720c01fSEric W. Biederman static int zero = 0; 317720c01fSEric W. Biederman static int label_limit = (1 << 20) - 1; 327720c01fSEric W. Biederman 338de147dcSEric W. Biederman static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 348de147dcSEric W. Biederman struct nlmsghdr *nlh, struct net *net, u32 portid, 358de147dcSEric W. Biederman unsigned int nlm_flags); 368de147dcSEric W. Biederman 370189197fSEric W. Biederman static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 380189197fSEric W. Biederman { 390189197fSEric W. Biederman struct mpls_route *rt = NULL; 400189197fSEric W. Biederman 410189197fSEric W. Biederman if (index < net->mpls.platform_labels) { 420189197fSEric W. Biederman struct mpls_route __rcu **platform_label = 430189197fSEric W. Biederman rcu_dereference(net->mpls.platform_label); 440189197fSEric W. Biederman rt = rcu_dereference(platform_label[index]); 450189197fSEric W. Biederman } 460189197fSEric W. Biederman return rt; 470189197fSEric W. Biederman } 480189197fSEric W. Biederman 4903c57747SRobert Shearman static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) 5003c57747SRobert Shearman { 5103c57747SRobert Shearman return rcu_dereference_rtnl(dev->mpls_ptr); 5203c57747SRobert Shearman } 5303c57747SRobert Shearman 54face0188SRoopa Prabhu bool mpls_output_possible(const struct net_device *dev) 550189197fSEric W. Biederman { 560189197fSEric W. Biederman return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 570189197fSEric W. Biederman } 58face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(mpls_output_possible); 590189197fSEric W. Biederman 60cf4b24f0SRobert Shearman static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 61cf4b24f0SRobert Shearman { 62cf4b24f0SRobert Shearman u8 *nh0_via = PTR_ALIGN((u8 *)&rt->rt_nh[rt->rt_nhn], VIA_ALEN_ALIGN); 63cf4b24f0SRobert Shearman int nh_index = nh - rt->rt_nh; 64cf4b24f0SRobert Shearman 65cf4b24f0SRobert Shearman return nh0_via + rt->rt_max_alen * nh_index; 66cf4b24f0SRobert Shearman } 67cf4b24f0SRobert Shearman 68cf4b24f0SRobert Shearman static const u8 *mpls_nh_via(const struct mpls_route *rt, 69cf4b24f0SRobert Shearman const struct mpls_nh *nh) 70cf4b24f0SRobert Shearman { 71cf4b24f0SRobert Shearman return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 72cf4b24f0SRobert Shearman } 73cf4b24f0SRobert Shearman 74f8efb73cSRoopa Prabhu static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 750189197fSEric W. Biederman { 760189197fSEric W. Biederman /* The size of the layer 2.5 labels to be added for this route */ 77f8efb73cSRoopa Prabhu return nh->nh_labels * sizeof(struct mpls_shim_hdr); 780189197fSEric W. Biederman } 790189197fSEric W. Biederman 80face0188SRoopa Prabhu unsigned int mpls_dev_mtu(const struct net_device *dev) 810189197fSEric W. Biederman { 820189197fSEric W. Biederman /* The amount of data the layer 2 frame can hold */ 830189197fSEric W. Biederman return dev->mtu; 840189197fSEric W. Biederman } 85face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(mpls_dev_mtu); 860189197fSEric W. Biederman 87face0188SRoopa Prabhu bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 880189197fSEric W. Biederman { 890189197fSEric W. Biederman if (skb->len <= mtu) 900189197fSEric W. Biederman return false; 910189197fSEric W. Biederman 920189197fSEric W. Biederman if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu) 930189197fSEric W. Biederman return false; 940189197fSEric W. Biederman 950189197fSEric W. Biederman return true; 960189197fSEric W. Biederman } 97face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 980189197fSEric W. Biederman 991c78efa8SRobert Shearman static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 1001c78efa8SRobert Shearman struct sk_buff *skb, bool bos) 101f8efb73cSRoopa Prabhu { 1021c78efa8SRobert Shearman struct mpls_entry_decoded dec; 1031c78efa8SRobert Shearman struct mpls_shim_hdr *hdr; 1041c78efa8SRobert Shearman bool eli_seen = false; 1051c78efa8SRobert Shearman int label_index; 1061c78efa8SRobert Shearman int nh_index = 0; 1071c78efa8SRobert Shearman u32 hash = 0; 1081c78efa8SRobert Shearman 1091c78efa8SRobert Shearman /* No need to look further into packet if there's only 1101c78efa8SRobert Shearman * one path 1111c78efa8SRobert Shearman */ 1121c78efa8SRobert Shearman if (rt->rt_nhn == 1) 1131c78efa8SRobert Shearman goto out; 1141c78efa8SRobert Shearman 1151c78efa8SRobert Shearman for (label_index = 0; label_index < MAX_MP_SELECT_LABELS && !bos; 1161c78efa8SRobert Shearman label_index++) { 1171c78efa8SRobert Shearman if (!pskb_may_pull(skb, sizeof(*hdr) * label_index)) 1181c78efa8SRobert Shearman break; 1191c78efa8SRobert Shearman 1201c78efa8SRobert Shearman /* Read and decode the current label */ 1211c78efa8SRobert Shearman hdr = mpls_hdr(skb) + label_index; 1221c78efa8SRobert Shearman dec = mpls_entry_decode(hdr); 1231c78efa8SRobert Shearman 1241c78efa8SRobert Shearman /* RFC6790 - reserved labels MUST NOT be used as keys 1251c78efa8SRobert Shearman * for the load-balancing function 1261c78efa8SRobert Shearman */ 1271c78efa8SRobert Shearman if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 1281c78efa8SRobert Shearman hash = jhash_1word(dec.label, hash); 1291c78efa8SRobert Shearman 1301c78efa8SRobert Shearman /* The entropy label follows the entropy label 1311c78efa8SRobert Shearman * indicator, so this means that the entropy 1321c78efa8SRobert Shearman * label was just added to the hash - no need to 1331c78efa8SRobert Shearman * go any deeper either in the label stack or in the 1341c78efa8SRobert Shearman * payload 1351c78efa8SRobert Shearman */ 1361c78efa8SRobert Shearman if (eli_seen) 1371c78efa8SRobert Shearman break; 1381c78efa8SRobert Shearman } else if (dec.label == MPLS_LABEL_ENTROPY) { 1391c78efa8SRobert Shearman eli_seen = true; 1401c78efa8SRobert Shearman } 1411c78efa8SRobert Shearman 1421c78efa8SRobert Shearman bos = dec.bos; 1431c78efa8SRobert Shearman if (bos && pskb_may_pull(skb, sizeof(*hdr) * label_index + 1441c78efa8SRobert Shearman sizeof(struct iphdr))) { 1451c78efa8SRobert Shearman const struct iphdr *v4hdr; 1461c78efa8SRobert Shearman 1471c78efa8SRobert Shearman v4hdr = (const struct iphdr *)(mpls_hdr(skb) + 1481c78efa8SRobert Shearman label_index); 1491c78efa8SRobert Shearman if (v4hdr->version == 4) { 1501c78efa8SRobert Shearman hash = jhash_3words(ntohl(v4hdr->saddr), 1511c78efa8SRobert Shearman ntohl(v4hdr->daddr), 1521c78efa8SRobert Shearman v4hdr->protocol, hash); 1531c78efa8SRobert Shearman } else if (v4hdr->version == 6 && 1541c78efa8SRobert Shearman pskb_may_pull(skb, sizeof(*hdr) * label_index + 1551c78efa8SRobert Shearman sizeof(struct ipv6hdr))) { 1561c78efa8SRobert Shearman const struct ipv6hdr *v6hdr; 1571c78efa8SRobert Shearman 1581c78efa8SRobert Shearman v6hdr = (const struct ipv6hdr *)(mpls_hdr(skb) + 1591c78efa8SRobert Shearman label_index); 1601c78efa8SRobert Shearman 1611c78efa8SRobert Shearman hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 1621c78efa8SRobert Shearman hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 1631c78efa8SRobert Shearman hash = jhash_1word(v6hdr->nexthdr, hash); 1641c78efa8SRobert Shearman } 1651c78efa8SRobert Shearman } 1661c78efa8SRobert Shearman } 1671c78efa8SRobert Shearman 1681c78efa8SRobert Shearman nh_index = hash % rt->rt_nhn; 1691c78efa8SRobert Shearman out: 1701c78efa8SRobert Shearman return &rt->rt_nh[nh_index]; 171f8efb73cSRoopa Prabhu } 172f8efb73cSRoopa Prabhu 1730189197fSEric W. Biederman static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb, 1740189197fSEric W. Biederman struct mpls_entry_decoded dec) 1750189197fSEric W. Biederman { 176118d5234SRobert Shearman enum mpls_payload_type payload_type; 177118d5234SRobert Shearman bool success = false; 1780189197fSEric W. Biederman 17976fecd82SEric W. Biederman /* The IPv4 code below accesses through the IPv4 header 18076fecd82SEric W. Biederman * checksum, which is 12 bytes into the packet. 18176fecd82SEric W. Biederman * The IPv6 code below accesses through the IPv6 hop limit 18276fecd82SEric W. Biederman * which is 8 bytes into the packet. 18376fecd82SEric W. Biederman * 18476fecd82SEric W. Biederman * For all supported cases there should always be at least 12 18576fecd82SEric W. Biederman * bytes of packet data present. The IPv4 header is 20 bytes 18676fecd82SEric W. Biederman * without options and the IPv6 header is always 40 bytes 18776fecd82SEric W. Biederman * long. 18876fecd82SEric W. Biederman */ 18976fecd82SEric W. Biederman if (!pskb_may_pull(skb, 12)) 19076fecd82SEric W. Biederman return false; 19176fecd82SEric W. Biederman 192118d5234SRobert Shearman payload_type = rt->rt_payload_type; 193118d5234SRobert Shearman if (payload_type == MPT_UNSPEC) 194118d5234SRobert Shearman payload_type = ip_hdr(skb)->version; 195118d5234SRobert Shearman 196118d5234SRobert Shearman switch (payload_type) { 197118d5234SRobert Shearman case MPT_IPV4: { 198118d5234SRobert Shearman struct iphdr *hdr4 = ip_hdr(skb); 1990189197fSEric W. Biederman skb->protocol = htons(ETH_P_IP); 2000189197fSEric W. Biederman csum_replace2(&hdr4->check, 2010189197fSEric W. Biederman htons(hdr4->ttl << 8), 2020189197fSEric W. Biederman htons(dec.ttl << 8)); 2030189197fSEric W. Biederman hdr4->ttl = dec.ttl; 204118d5234SRobert Shearman success = true; 205118d5234SRobert Shearman break; 2060189197fSEric W. Biederman } 207118d5234SRobert Shearman case MPT_IPV6: { 2080189197fSEric W. Biederman struct ipv6hdr *hdr6 = ipv6_hdr(skb); 2090189197fSEric W. Biederman skb->protocol = htons(ETH_P_IPV6); 2100189197fSEric W. Biederman hdr6->hop_limit = dec.ttl; 211118d5234SRobert Shearman success = true; 212118d5234SRobert Shearman break; 2130189197fSEric W. Biederman } 214118d5234SRobert Shearman case MPT_UNSPEC: 215118d5234SRobert Shearman break; 216118d5234SRobert Shearman } 217118d5234SRobert Shearman 2180189197fSEric W. Biederman return success; 2190189197fSEric W. Biederman } 2200189197fSEric W. Biederman 2210189197fSEric W. Biederman static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 2220189197fSEric W. Biederman struct packet_type *pt, struct net_device *orig_dev) 2230189197fSEric W. Biederman { 2240189197fSEric W. Biederman struct net *net = dev_net(dev); 2250189197fSEric W. Biederman struct mpls_shim_hdr *hdr; 2260189197fSEric W. Biederman struct mpls_route *rt; 227f8efb73cSRoopa Prabhu struct mpls_nh *nh; 2280189197fSEric W. Biederman struct mpls_entry_decoded dec; 2290189197fSEric W. Biederman struct net_device *out_dev; 23003c57747SRobert Shearman struct mpls_dev *mdev; 2310189197fSEric W. Biederman unsigned int hh_len; 2320189197fSEric W. Biederman unsigned int new_header_size; 2330189197fSEric W. Biederman unsigned int mtu; 2340189197fSEric W. Biederman int err; 2350189197fSEric W. Biederman 2360189197fSEric W. Biederman /* Careful this entire function runs inside of an rcu critical section */ 2370189197fSEric W. Biederman 23803c57747SRobert Shearman mdev = mpls_dev_get(dev); 23937bde799SRobert Shearman if (!mdev || !mdev->input_enabled) 24003c57747SRobert Shearman goto drop; 24103c57747SRobert Shearman 2420189197fSEric W. Biederman if (skb->pkt_type != PACKET_HOST) 2430189197fSEric W. Biederman goto drop; 2440189197fSEric W. Biederman 2450189197fSEric W. Biederman if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 2460189197fSEric W. Biederman goto drop; 2470189197fSEric W. Biederman 2480189197fSEric W. Biederman if (!pskb_may_pull(skb, sizeof(*hdr))) 2490189197fSEric W. Biederman goto drop; 2500189197fSEric W. Biederman 2510189197fSEric W. Biederman /* Read and decode the label */ 2520189197fSEric W. Biederman hdr = mpls_hdr(skb); 2530189197fSEric W. Biederman dec = mpls_entry_decode(hdr); 2540189197fSEric W. Biederman 2550189197fSEric W. Biederman /* Pop the label */ 2560189197fSEric W. Biederman skb_pull(skb, sizeof(*hdr)); 2570189197fSEric W. Biederman skb_reset_network_header(skb); 2580189197fSEric W. Biederman 2590189197fSEric W. Biederman skb_orphan(skb); 2600189197fSEric W. Biederman 2610189197fSEric W. Biederman rt = mpls_route_input_rcu(net, dec.label); 2620189197fSEric W. Biederman if (!rt) 2630189197fSEric W. Biederman goto drop; 2640189197fSEric W. Biederman 2651c78efa8SRobert Shearman nh = mpls_select_multipath(rt, skb, dec.bos); 266f8efb73cSRoopa Prabhu if (!nh) 267f8efb73cSRoopa Prabhu goto drop; 268f8efb73cSRoopa Prabhu 2690189197fSEric W. Biederman /* Find the output device */ 270f8efb73cSRoopa Prabhu out_dev = rcu_dereference(nh->nh_dev); 2710189197fSEric W. Biederman if (!mpls_output_possible(out_dev)) 2720189197fSEric W. Biederman goto drop; 2730189197fSEric W. Biederman 2740189197fSEric W. Biederman if (skb_warn_if_lro(skb)) 2750189197fSEric W. Biederman goto drop; 2760189197fSEric W. Biederman 2770189197fSEric W. Biederman skb_forward_csum(skb); 2780189197fSEric W. Biederman 2790189197fSEric W. Biederman /* Verify ttl is valid */ 280aa7da937SEric W. Biederman if (dec.ttl <= 1) 2810189197fSEric W. Biederman goto drop; 2820189197fSEric W. Biederman dec.ttl -= 1; 2830189197fSEric W. Biederman 2840189197fSEric W. Biederman /* Verify the destination can hold the packet */ 285f8efb73cSRoopa Prabhu new_header_size = mpls_nh_header_size(nh); 2860189197fSEric W. Biederman mtu = mpls_dev_mtu(out_dev); 2870189197fSEric W. Biederman if (mpls_pkt_too_big(skb, mtu - new_header_size)) 2880189197fSEric W. Biederman goto drop; 2890189197fSEric W. Biederman 2900189197fSEric W. Biederman hh_len = LL_RESERVED_SPACE(out_dev); 2910189197fSEric W. Biederman if (!out_dev->header_ops) 2920189197fSEric W. Biederman hh_len = 0; 2930189197fSEric W. Biederman 2940189197fSEric W. Biederman /* Ensure there is enough space for the headers in the skb */ 2950189197fSEric W. Biederman if (skb_cow(skb, hh_len + new_header_size)) 2960189197fSEric W. Biederman goto drop; 2970189197fSEric W. Biederman 2980189197fSEric W. Biederman skb->dev = out_dev; 2990189197fSEric W. Biederman skb->protocol = htons(ETH_P_MPLS_UC); 3000189197fSEric W. Biederman 3010189197fSEric W. Biederman if (unlikely(!new_header_size && dec.bos)) { 3020189197fSEric W. Biederman /* Penultimate hop popping */ 3030189197fSEric W. Biederman if (!mpls_egress(rt, skb, dec)) 3040189197fSEric W. Biederman goto drop; 3050189197fSEric W. Biederman } else { 3060189197fSEric W. Biederman bool bos; 3070189197fSEric W. Biederman int i; 3080189197fSEric W. Biederman skb_push(skb, new_header_size); 3090189197fSEric W. Biederman skb_reset_network_header(skb); 3100189197fSEric W. Biederman /* Push the new labels */ 3110189197fSEric W. Biederman hdr = mpls_hdr(skb); 3120189197fSEric W. Biederman bos = dec.bos; 313f8efb73cSRoopa Prabhu for (i = nh->nh_labels - 1; i >= 0; i--) { 314f8efb73cSRoopa Prabhu hdr[i] = mpls_entry_encode(nh->nh_label[i], 315f8efb73cSRoopa Prabhu dec.ttl, 0, bos); 3160189197fSEric W. Biederman bos = false; 3170189197fSEric W. Biederman } 3180189197fSEric W. Biederman } 3190189197fSEric W. Biederman 320cf4b24f0SRobert Shearman err = neigh_xmit(nh->nh_via_table, out_dev, mpls_nh_via(rt, nh), skb); 3210189197fSEric W. Biederman if (err) 3220189197fSEric W. Biederman net_dbg_ratelimited("%s: packet transmission failed: %d\n", 3230189197fSEric W. Biederman __func__, err); 3240189197fSEric W. Biederman return 0; 3250189197fSEric W. Biederman 3260189197fSEric W. Biederman drop: 3270189197fSEric W. Biederman kfree_skb(skb); 3280189197fSEric W. Biederman return NET_RX_DROP; 3290189197fSEric W. Biederman } 3300189197fSEric W. Biederman 3310189197fSEric W. Biederman static struct packet_type mpls_packet_type __read_mostly = { 3320189197fSEric W. Biederman .type = cpu_to_be16(ETH_P_MPLS_UC), 3330189197fSEric W. Biederman .func = mpls_forward, 3340189197fSEric W. Biederman }; 3350189197fSEric W. Biederman 336f0126539SWu Fengguang static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 33703c05665SEric W. Biederman [RTA_DST] = { .type = NLA_U32 }, 33803c05665SEric W. Biederman [RTA_OIF] = { .type = NLA_U32 }, 33903c05665SEric W. Biederman }; 34003c05665SEric W. Biederman 341a2519929SEric W. Biederman struct mpls_route_config { 342a2519929SEric W. Biederman u32 rc_protocol; 343a2519929SEric W. Biederman u32 rc_ifindex; 344f8efb73cSRoopa Prabhu u8 rc_via_table; 345f8efb73cSRoopa Prabhu u8 rc_via_alen; 346a2519929SEric W. Biederman u8 rc_via[MAX_VIA_ALEN]; 347a2519929SEric W. Biederman u32 rc_label; 348f8efb73cSRoopa Prabhu u8 rc_output_labels; 349a2519929SEric W. Biederman u32 rc_output_label[MAX_NEW_LABELS]; 350a2519929SEric W. Biederman u32 rc_nlflags; 351118d5234SRobert Shearman enum mpls_payload_type rc_payload_type; 352a2519929SEric W. Biederman struct nl_info rc_nlinfo; 353f8efb73cSRoopa Prabhu struct rtnexthop *rc_mp; 354f8efb73cSRoopa Prabhu int rc_mp_len; 355a2519929SEric W. Biederman }; 356a2519929SEric W. Biederman 357cf4b24f0SRobert Shearman static struct mpls_route *mpls_rt_alloc(int num_nh, u8 max_alen) 3580189197fSEric W. Biederman { 359cf4b24f0SRobert Shearman u8 max_alen_aligned = ALIGN(max_alen, VIA_ALEN_ALIGN); 3600189197fSEric W. Biederman struct mpls_route *rt; 3610189197fSEric W. Biederman 362cf4b24f0SRobert Shearman rt = kzalloc(ALIGN(sizeof(*rt) + num_nh * sizeof(*rt->rt_nh), 363cf4b24f0SRobert Shearman VIA_ALEN_ALIGN) + 364cf4b24f0SRobert Shearman num_nh * max_alen_aligned, 365f8efb73cSRoopa Prabhu GFP_KERNEL); 366cf4b24f0SRobert Shearman if (rt) { 367f8efb73cSRoopa Prabhu rt->rt_nhn = num_nh; 368cf4b24f0SRobert Shearman rt->rt_max_alen = max_alen_aligned; 369cf4b24f0SRobert Shearman } 370f8efb73cSRoopa Prabhu 3710189197fSEric W. Biederman return rt; 3720189197fSEric W. Biederman } 3730189197fSEric W. Biederman 3740189197fSEric W. Biederman static void mpls_rt_free(struct mpls_route *rt) 3750189197fSEric W. Biederman { 3760189197fSEric W. Biederman if (rt) 3770189197fSEric W. Biederman kfree_rcu(rt, rt_rcu); 3780189197fSEric W. Biederman } 3790189197fSEric W. Biederman 3808de147dcSEric W. Biederman static void mpls_notify_route(struct net *net, unsigned index, 3818de147dcSEric W. Biederman struct mpls_route *old, struct mpls_route *new, 3828de147dcSEric W. Biederman const struct nl_info *info) 3838de147dcSEric W. Biederman { 3848de147dcSEric W. Biederman struct nlmsghdr *nlh = info ? info->nlh : NULL; 3858de147dcSEric W. Biederman unsigned portid = info ? info->portid : 0; 3868de147dcSEric W. Biederman int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 3878de147dcSEric W. Biederman struct mpls_route *rt = new ? new : old; 3888de147dcSEric W. Biederman unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 3898de147dcSEric W. Biederman /* Ignore reserved labels for now */ 390a6affd24SRobert Shearman if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 3918de147dcSEric W. Biederman rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 3928de147dcSEric W. Biederman } 3938de147dcSEric W. Biederman 3940189197fSEric W. Biederman static void mpls_route_update(struct net *net, unsigned index, 395f8efb73cSRoopa Prabhu struct mpls_route *new, 3960189197fSEric W. Biederman const struct nl_info *info) 3970189197fSEric W. Biederman { 39819d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 399f8efb73cSRoopa Prabhu struct mpls_route *rt; 4000189197fSEric W. Biederman 4010189197fSEric W. Biederman ASSERT_RTNL(); 4020189197fSEric W. Biederman 40319d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 40419d0c341SEric W. Biederman rt = rtnl_dereference(platform_label[index]); 40519d0c341SEric W. Biederman rcu_assign_pointer(platform_label[index], new); 4060189197fSEric W. Biederman 407f8efb73cSRoopa Prabhu mpls_notify_route(net, index, rt, new, info); 4088de147dcSEric W. Biederman 4090189197fSEric W. Biederman /* If we removed a route free it now */ 410f8efb73cSRoopa Prabhu mpls_rt_free(rt); 4110189197fSEric W. Biederman } 4120189197fSEric W. Biederman 413a2519929SEric W. Biederman static unsigned find_free_label(struct net *net) 414a2519929SEric W. Biederman { 41519d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 41619d0c341SEric W. Biederman size_t platform_labels; 417a2519929SEric W. Biederman unsigned index; 41819d0c341SEric W. Biederman 41919d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 42019d0c341SEric W. Biederman platform_labels = net->mpls.platform_labels; 421a6affd24SRobert Shearman for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 422a6affd24SRobert Shearman index++) { 42319d0c341SEric W. Biederman if (!rtnl_dereference(platform_label[index])) 424a2519929SEric W. Biederman return index; 425a2519929SEric W. Biederman } 426a2519929SEric W. Biederman return LABEL_NOT_SPECIFIED; 427a2519929SEric W. Biederman } 428a2519929SEric W. Biederman 429bf21563aSRoopa Prabhu #if IS_ENABLED(CONFIG_INET) 430cf4b24f0SRobert Shearman static struct net_device *inet_fib_lookup_dev(struct net *net, 431cf4b24f0SRobert Shearman const void *addr) 43201faef2cSRoopa Prabhu { 4335a9348b5SDan Carpenter struct net_device *dev; 43401faef2cSRoopa Prabhu struct rtable *rt; 43501faef2cSRoopa Prabhu struct in_addr daddr; 43601faef2cSRoopa Prabhu 43701faef2cSRoopa Prabhu memcpy(&daddr, addr, sizeof(struct in_addr)); 43801faef2cSRoopa Prabhu rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 43901faef2cSRoopa Prabhu if (IS_ERR(rt)) 4405a9348b5SDan Carpenter return ERR_CAST(rt); 44101faef2cSRoopa Prabhu 44201faef2cSRoopa Prabhu dev = rt->dst.dev; 44301faef2cSRoopa Prabhu dev_hold(dev); 44401faef2cSRoopa Prabhu 44501faef2cSRoopa Prabhu ip_rt_put(rt); 44601faef2cSRoopa Prabhu 44701faef2cSRoopa Prabhu return dev; 44801faef2cSRoopa Prabhu } 449bf21563aSRoopa Prabhu #else 450cf4b24f0SRobert Shearman static struct net_device *inet_fib_lookup_dev(struct net *net, 451cf4b24f0SRobert Shearman const void *addr) 452bf21563aSRoopa Prabhu { 453bf21563aSRoopa Prabhu return ERR_PTR(-EAFNOSUPPORT); 454bf21563aSRoopa Prabhu } 455bf21563aSRoopa Prabhu #endif 45601faef2cSRoopa Prabhu 457bf21563aSRoopa Prabhu #if IS_ENABLED(CONFIG_IPV6) 458cf4b24f0SRobert Shearman static struct net_device *inet6_fib_lookup_dev(struct net *net, 459cf4b24f0SRobert Shearman const void *addr) 46001faef2cSRoopa Prabhu { 4615a9348b5SDan Carpenter struct net_device *dev; 46201faef2cSRoopa Prabhu struct dst_entry *dst; 46301faef2cSRoopa Prabhu struct flowi6 fl6; 464bf21563aSRoopa Prabhu int err; 465bf21563aSRoopa Prabhu 466bf21563aSRoopa Prabhu if (!ipv6_stub) 467bf21563aSRoopa Prabhu return ERR_PTR(-EAFNOSUPPORT); 46801faef2cSRoopa Prabhu 46901faef2cSRoopa Prabhu memset(&fl6, 0, sizeof(fl6)); 47001faef2cSRoopa Prabhu memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 471bf21563aSRoopa Prabhu err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); 472bf21563aSRoopa Prabhu if (err) 4735a9348b5SDan Carpenter return ERR_PTR(err); 47401faef2cSRoopa Prabhu 47501faef2cSRoopa Prabhu dev = dst->dev; 47601faef2cSRoopa Prabhu dev_hold(dev); 47701faef2cSRoopa Prabhu dst_release(dst); 47801faef2cSRoopa Prabhu 47901faef2cSRoopa Prabhu return dev; 48001faef2cSRoopa Prabhu } 481bf21563aSRoopa Prabhu #else 482cf4b24f0SRobert Shearman static struct net_device *inet6_fib_lookup_dev(struct net *net, 483cf4b24f0SRobert Shearman const void *addr) 484bf21563aSRoopa Prabhu { 485bf21563aSRoopa Prabhu return ERR_PTR(-EAFNOSUPPORT); 486bf21563aSRoopa Prabhu } 487bf21563aSRoopa Prabhu #endif 48801faef2cSRoopa Prabhu 48901faef2cSRoopa Prabhu static struct net_device *find_outdev(struct net *net, 490cf4b24f0SRobert Shearman struct mpls_route *rt, 491f8efb73cSRoopa Prabhu struct mpls_nh *nh, int oif) 49201faef2cSRoopa Prabhu { 49301faef2cSRoopa Prabhu struct net_device *dev = NULL; 49401faef2cSRoopa Prabhu 495f8efb73cSRoopa Prabhu if (!oif) { 496f8efb73cSRoopa Prabhu switch (nh->nh_via_table) { 49701faef2cSRoopa Prabhu case NEIGH_ARP_TABLE: 498cf4b24f0SRobert Shearman dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 49901faef2cSRoopa Prabhu break; 50001faef2cSRoopa Prabhu case NEIGH_ND_TABLE: 501cf4b24f0SRobert Shearman dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 50201faef2cSRoopa Prabhu break; 50301faef2cSRoopa Prabhu case NEIGH_LINK_TABLE: 50401faef2cSRoopa Prabhu break; 50501faef2cSRoopa Prabhu } 50601faef2cSRoopa Prabhu } else { 507f8efb73cSRoopa Prabhu dev = dev_get_by_index(net, oif); 50801faef2cSRoopa Prabhu } 50901faef2cSRoopa Prabhu 5103dcb615eSRoopa Prabhu if (!dev) 5113dcb615eSRoopa Prabhu return ERR_PTR(-ENODEV); 5123dcb615eSRoopa Prabhu 513f8efb73cSRoopa Prabhu /* The caller is holding rtnl anyways, so release the dev reference */ 514f8efb73cSRoopa Prabhu dev_put(dev); 515f8efb73cSRoopa Prabhu 51601faef2cSRoopa Prabhu return dev; 51701faef2cSRoopa Prabhu } 51801faef2cSRoopa Prabhu 519cf4b24f0SRobert Shearman static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 520cf4b24f0SRobert Shearman struct mpls_nh *nh, int oif) 521f8efb73cSRoopa Prabhu { 522f8efb73cSRoopa Prabhu struct net_device *dev = NULL; 523f8efb73cSRoopa Prabhu int err = -ENODEV; 524f8efb73cSRoopa Prabhu 525cf4b24f0SRobert Shearman dev = find_outdev(net, rt, nh, oif); 526f8efb73cSRoopa Prabhu if (IS_ERR(dev)) { 527f8efb73cSRoopa Prabhu err = PTR_ERR(dev); 528f8efb73cSRoopa Prabhu dev = NULL; 529f8efb73cSRoopa Prabhu goto errout; 530f8efb73cSRoopa Prabhu } 531f8efb73cSRoopa Prabhu 532f8efb73cSRoopa Prabhu /* Ensure this is a supported device */ 533f8efb73cSRoopa Prabhu err = -EINVAL; 534f8efb73cSRoopa Prabhu if (!mpls_dev_get(dev)) 535f8efb73cSRoopa Prabhu goto errout; 536f8efb73cSRoopa Prabhu 537*a3e948e8SRobert Shearman if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 538*a3e948e8SRobert Shearman (dev->addr_len != nh->nh_via_alen)) 539*a3e948e8SRobert Shearman goto errout; 540*a3e948e8SRobert Shearman 541f8efb73cSRoopa Prabhu RCU_INIT_POINTER(nh->nh_dev, dev); 542f8efb73cSRoopa Prabhu 543f8efb73cSRoopa Prabhu return 0; 544f8efb73cSRoopa Prabhu 545f8efb73cSRoopa Prabhu errout: 546f8efb73cSRoopa Prabhu return err; 547f8efb73cSRoopa Prabhu } 548f8efb73cSRoopa Prabhu 549f8efb73cSRoopa Prabhu static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 550f8efb73cSRoopa Prabhu struct mpls_route *rt) 551f8efb73cSRoopa Prabhu { 552f8efb73cSRoopa Prabhu struct net *net = cfg->rc_nlinfo.nl_net; 553f8efb73cSRoopa Prabhu struct mpls_nh *nh = rt->rt_nh; 554f8efb73cSRoopa Prabhu int err; 555f8efb73cSRoopa Prabhu int i; 556f8efb73cSRoopa Prabhu 557f8efb73cSRoopa Prabhu if (!nh) 558f8efb73cSRoopa Prabhu return -ENOMEM; 559f8efb73cSRoopa Prabhu 560f8efb73cSRoopa Prabhu err = -EINVAL; 561f8efb73cSRoopa Prabhu /* Ensure only a supported number of labels are present */ 562f8efb73cSRoopa Prabhu if (cfg->rc_output_labels > MAX_NEW_LABELS) 563f8efb73cSRoopa Prabhu goto errout; 564f8efb73cSRoopa Prabhu 565f8efb73cSRoopa Prabhu nh->nh_labels = cfg->rc_output_labels; 566f8efb73cSRoopa Prabhu for (i = 0; i < nh->nh_labels; i++) 567f8efb73cSRoopa Prabhu nh->nh_label[i] = cfg->rc_output_label[i]; 568f8efb73cSRoopa Prabhu 569f8efb73cSRoopa Prabhu nh->nh_via_table = cfg->rc_via_table; 570cf4b24f0SRobert Shearman memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 571f8efb73cSRoopa Prabhu nh->nh_via_alen = cfg->rc_via_alen; 572f8efb73cSRoopa Prabhu 573cf4b24f0SRobert Shearman err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 574f8efb73cSRoopa Prabhu if (err) 575f8efb73cSRoopa Prabhu goto errout; 576f8efb73cSRoopa Prabhu 577f8efb73cSRoopa Prabhu return 0; 578f8efb73cSRoopa Prabhu 579f8efb73cSRoopa Prabhu errout: 580f8efb73cSRoopa Prabhu return err; 581f8efb73cSRoopa Prabhu } 582f8efb73cSRoopa Prabhu 583cf4b24f0SRobert Shearman static int mpls_nh_build(struct net *net, struct mpls_route *rt, 584cf4b24f0SRobert Shearman struct mpls_nh *nh, int oif, 585cf4b24f0SRobert Shearman struct nlattr *via, struct nlattr *newdst) 586f8efb73cSRoopa Prabhu { 587f8efb73cSRoopa Prabhu int err = -ENOMEM; 588f8efb73cSRoopa Prabhu 589f8efb73cSRoopa Prabhu if (!nh) 590f8efb73cSRoopa Prabhu goto errout; 591f8efb73cSRoopa Prabhu 592f8efb73cSRoopa Prabhu if (newdst) { 593f8efb73cSRoopa Prabhu err = nla_get_labels(newdst, MAX_NEW_LABELS, 594f8efb73cSRoopa Prabhu &nh->nh_labels, nh->nh_label); 595f8efb73cSRoopa Prabhu if (err) 596f8efb73cSRoopa Prabhu goto errout; 597f8efb73cSRoopa Prabhu } 598f8efb73cSRoopa Prabhu 599f8efb73cSRoopa Prabhu err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 600cf4b24f0SRobert Shearman __mpls_nh_via(rt, nh)); 601f8efb73cSRoopa Prabhu if (err) 602f8efb73cSRoopa Prabhu goto errout; 603f8efb73cSRoopa Prabhu 604cf4b24f0SRobert Shearman err = mpls_nh_assign_dev(net, rt, nh, oif); 605f8efb73cSRoopa Prabhu if (err) 606f8efb73cSRoopa Prabhu goto errout; 607f8efb73cSRoopa Prabhu 608f8efb73cSRoopa Prabhu return 0; 609f8efb73cSRoopa Prabhu 610f8efb73cSRoopa Prabhu errout: 611f8efb73cSRoopa Prabhu return err; 612f8efb73cSRoopa Prabhu } 613f8efb73cSRoopa Prabhu 614cf4b24f0SRobert Shearman static int mpls_count_nexthops(struct rtnexthop *rtnh, int len, 615cf4b24f0SRobert Shearman u8 cfg_via_alen, u8 *max_via_alen) 616f8efb73cSRoopa Prabhu { 617f8efb73cSRoopa Prabhu int nhs = 0; 618f8efb73cSRoopa Prabhu int remaining = len; 619f8efb73cSRoopa Prabhu 620cf4b24f0SRobert Shearman if (!rtnh) { 621cf4b24f0SRobert Shearman *max_via_alen = cfg_via_alen; 622cf4b24f0SRobert Shearman return 1; 623cf4b24f0SRobert Shearman } 624cf4b24f0SRobert Shearman 625cf4b24f0SRobert Shearman *max_via_alen = 0; 626cf4b24f0SRobert Shearman 627f8efb73cSRoopa Prabhu while (rtnh_ok(rtnh, remaining)) { 628cf4b24f0SRobert Shearman struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 629cf4b24f0SRobert Shearman int attrlen; 630cf4b24f0SRobert Shearman 631cf4b24f0SRobert Shearman attrlen = rtnh_attrlen(rtnh); 632cf4b24f0SRobert Shearman nla = nla_find(attrs, attrlen, RTA_VIA); 633cf4b24f0SRobert Shearman if (nla && nla_len(nla) >= 634cf4b24f0SRobert Shearman offsetof(struct rtvia, rtvia_addr)) { 635cf4b24f0SRobert Shearman int via_alen = nla_len(nla) - 636cf4b24f0SRobert Shearman offsetof(struct rtvia, rtvia_addr); 637cf4b24f0SRobert Shearman 638cf4b24f0SRobert Shearman if (via_alen <= MAX_VIA_ALEN) 639cf4b24f0SRobert Shearman *max_via_alen = max_t(u16, *max_via_alen, 640cf4b24f0SRobert Shearman via_alen); 641cf4b24f0SRobert Shearman } 642cf4b24f0SRobert Shearman 643f8efb73cSRoopa Prabhu nhs++; 644f8efb73cSRoopa Prabhu rtnh = rtnh_next(rtnh, &remaining); 645f8efb73cSRoopa Prabhu } 646f8efb73cSRoopa Prabhu 647f8efb73cSRoopa Prabhu /* leftover implies invalid nexthop configuration, discard it */ 648f8efb73cSRoopa Prabhu return remaining > 0 ? 0 : nhs; 649f8efb73cSRoopa Prabhu } 650f8efb73cSRoopa Prabhu 651f8efb73cSRoopa Prabhu static int mpls_nh_build_multi(struct mpls_route_config *cfg, 652f8efb73cSRoopa Prabhu struct mpls_route *rt) 653f8efb73cSRoopa Prabhu { 654f8efb73cSRoopa Prabhu struct rtnexthop *rtnh = cfg->rc_mp; 655f8efb73cSRoopa Prabhu struct nlattr *nla_via, *nla_newdst; 656f8efb73cSRoopa Prabhu int remaining = cfg->rc_mp_len; 657f8efb73cSRoopa Prabhu int nhs = 0; 658f8efb73cSRoopa Prabhu int err = 0; 659f8efb73cSRoopa Prabhu 660f8efb73cSRoopa Prabhu change_nexthops(rt) { 661f8efb73cSRoopa Prabhu int attrlen; 662f8efb73cSRoopa Prabhu 663f8efb73cSRoopa Prabhu nla_via = NULL; 664f8efb73cSRoopa Prabhu nla_newdst = NULL; 665f8efb73cSRoopa Prabhu 666f8efb73cSRoopa Prabhu err = -EINVAL; 667f8efb73cSRoopa Prabhu if (!rtnh_ok(rtnh, remaining)) 668f8efb73cSRoopa Prabhu goto errout; 669f8efb73cSRoopa Prabhu 6701c78efa8SRobert Shearman /* neither weighted multipath nor any flags 6711c78efa8SRobert Shearman * are supported 6721c78efa8SRobert Shearman */ 6731c78efa8SRobert Shearman if (rtnh->rtnh_hops || rtnh->rtnh_flags) 6741c78efa8SRobert Shearman goto errout; 6751c78efa8SRobert Shearman 676f8efb73cSRoopa Prabhu attrlen = rtnh_attrlen(rtnh); 677f8efb73cSRoopa Prabhu if (attrlen > 0) { 678f8efb73cSRoopa Prabhu struct nlattr *attrs = rtnh_attrs(rtnh); 679f8efb73cSRoopa Prabhu 680f8efb73cSRoopa Prabhu nla_via = nla_find(attrs, attrlen, RTA_VIA); 681f8efb73cSRoopa Prabhu nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 682f8efb73cSRoopa Prabhu } 683f8efb73cSRoopa Prabhu 684f8efb73cSRoopa Prabhu if (!nla_via) 685f8efb73cSRoopa Prabhu goto errout; 686f8efb73cSRoopa Prabhu 687cf4b24f0SRobert Shearman err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 688f8efb73cSRoopa Prabhu rtnh->rtnh_ifindex, nla_via, 689f8efb73cSRoopa Prabhu nla_newdst); 690f8efb73cSRoopa Prabhu if (err) 691f8efb73cSRoopa Prabhu goto errout; 692f8efb73cSRoopa Prabhu 693f8efb73cSRoopa Prabhu rtnh = rtnh_next(rtnh, &remaining); 694f8efb73cSRoopa Prabhu nhs++; 695f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 696f8efb73cSRoopa Prabhu 697f8efb73cSRoopa Prabhu rt->rt_nhn = nhs; 698f8efb73cSRoopa Prabhu 699f8efb73cSRoopa Prabhu return 0; 700f8efb73cSRoopa Prabhu 701f8efb73cSRoopa Prabhu errout: 702f8efb73cSRoopa Prabhu return err; 703f8efb73cSRoopa Prabhu } 704f8efb73cSRoopa Prabhu 705a2519929SEric W. Biederman static int mpls_route_add(struct mpls_route_config *cfg) 706a2519929SEric W. Biederman { 70719d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 708a2519929SEric W. Biederman struct net *net = cfg->rc_nlinfo.nl_net; 709a2519929SEric W. Biederman struct mpls_route *rt, *old; 710a2519929SEric W. Biederman int err = -EINVAL; 711cf4b24f0SRobert Shearman u8 max_via_alen; 712f8efb73cSRoopa Prabhu unsigned index; 713cf4b24f0SRobert Shearman int nhs; 714a2519929SEric W. Biederman 715a2519929SEric W. Biederman index = cfg->rc_label; 716a2519929SEric W. Biederman 717a2519929SEric W. Biederman /* If a label was not specified during insert pick one */ 718a2519929SEric W. Biederman if ((index == LABEL_NOT_SPECIFIED) && 719a2519929SEric W. Biederman (cfg->rc_nlflags & NLM_F_CREATE)) { 720a2519929SEric W. Biederman index = find_free_label(net); 721a2519929SEric W. Biederman } 722a2519929SEric W. Biederman 723a6affd24SRobert Shearman /* Reserved labels may not be set */ 724a6affd24SRobert Shearman if (index < MPLS_LABEL_FIRST_UNRESERVED) 725a2519929SEric W. Biederman goto errout; 726a2519929SEric W. Biederman 727a2519929SEric W. Biederman /* The full 20 bit range may not be supported. */ 728a2519929SEric W. Biederman if (index >= net->mpls.platform_labels) 729a2519929SEric W. Biederman goto errout; 730a2519929SEric W. Biederman 731a2519929SEric W. Biederman /* Append makes no sense with mpls */ 7320f7bbd58SEric W. Biederman err = -EOPNOTSUPP; 733a2519929SEric W. Biederman if (cfg->rc_nlflags & NLM_F_APPEND) 734a2519929SEric W. Biederman goto errout; 735a2519929SEric W. Biederman 736a2519929SEric W. Biederman err = -EEXIST; 73719d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 73819d0c341SEric W. Biederman old = rtnl_dereference(platform_label[index]); 739a2519929SEric W. Biederman if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 740a2519929SEric W. Biederman goto errout; 741a2519929SEric W. Biederman 742a2519929SEric W. Biederman err = -EEXIST; 743a2519929SEric W. Biederman if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 744a2519929SEric W. Biederman goto errout; 745a2519929SEric W. Biederman 746a2519929SEric W. Biederman err = -ENOENT; 747a2519929SEric W. Biederman if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 748a2519929SEric W. Biederman goto errout; 749a2519929SEric W. Biederman 750f8efb73cSRoopa Prabhu err = -EINVAL; 751cf4b24f0SRobert Shearman nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 752cf4b24f0SRobert Shearman cfg->rc_via_alen, &max_via_alen); 753f8efb73cSRoopa Prabhu if (nhs == 0) 754f8efb73cSRoopa Prabhu goto errout; 755f8efb73cSRoopa Prabhu 756a2519929SEric W. Biederman err = -ENOMEM; 757cf4b24f0SRobert Shearman rt = mpls_rt_alloc(nhs, max_via_alen); 758a2519929SEric W. Biederman if (!rt) 759a2519929SEric W. Biederman goto errout; 760a2519929SEric W. Biederman 761a2519929SEric W. Biederman rt->rt_protocol = cfg->rc_protocol; 762118d5234SRobert Shearman rt->rt_payload_type = cfg->rc_payload_type; 763a2519929SEric W. Biederman 764f8efb73cSRoopa Prabhu if (cfg->rc_mp) 765f8efb73cSRoopa Prabhu err = mpls_nh_build_multi(cfg, rt); 766f8efb73cSRoopa Prabhu else 767f8efb73cSRoopa Prabhu err = mpls_nh_build_from_cfg(cfg, rt); 768f8efb73cSRoopa Prabhu if (err) 769f8efb73cSRoopa Prabhu goto freert; 770a2519929SEric W. Biederman 771f8efb73cSRoopa Prabhu mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 772f8efb73cSRoopa Prabhu 773a2519929SEric W. Biederman return 0; 774a2519929SEric W. Biederman 775f8efb73cSRoopa Prabhu freert: 776f8efb73cSRoopa Prabhu mpls_rt_free(rt); 777a2519929SEric W. Biederman errout: 778a2519929SEric W. Biederman return err; 779a2519929SEric W. Biederman } 780a2519929SEric W. Biederman 781a2519929SEric W. Biederman static int mpls_route_del(struct mpls_route_config *cfg) 782a2519929SEric W. Biederman { 783a2519929SEric W. Biederman struct net *net = cfg->rc_nlinfo.nl_net; 784a2519929SEric W. Biederman unsigned index; 785a2519929SEric W. Biederman int err = -EINVAL; 786a2519929SEric W. Biederman 787a2519929SEric W. Biederman index = cfg->rc_label; 788a2519929SEric W. Biederman 789a6affd24SRobert Shearman /* Reserved labels may not be removed */ 790a6affd24SRobert Shearman if (index < MPLS_LABEL_FIRST_UNRESERVED) 791a2519929SEric W. Biederman goto errout; 792a2519929SEric W. Biederman 793a2519929SEric W. Biederman /* The full 20 bit range may not be supported */ 794a2519929SEric W. Biederman if (index >= net->mpls.platform_labels) 795a2519929SEric W. Biederman goto errout; 796a2519929SEric W. Biederman 797f8efb73cSRoopa Prabhu mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 798a2519929SEric W. Biederman 799a2519929SEric W. Biederman err = 0; 800a2519929SEric W. Biederman errout: 801a2519929SEric W. Biederman return err; 802a2519929SEric W. Biederman } 803a2519929SEric W. Biederman 80437bde799SRobert Shearman #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 80537bde799SRobert Shearman (&((struct mpls_dev *)0)->field) 80637bde799SRobert Shearman 80737bde799SRobert Shearman static const struct ctl_table mpls_dev_table[] = { 80837bde799SRobert Shearman { 80937bde799SRobert Shearman .procname = "input", 81037bde799SRobert Shearman .maxlen = sizeof(int), 81137bde799SRobert Shearman .mode = 0644, 81237bde799SRobert Shearman .proc_handler = proc_dointvec, 81337bde799SRobert Shearman .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 81437bde799SRobert Shearman }, 81537bde799SRobert Shearman { } 81637bde799SRobert Shearman }; 81737bde799SRobert Shearman 81837bde799SRobert Shearman static int mpls_dev_sysctl_register(struct net_device *dev, 81937bde799SRobert Shearman struct mpls_dev *mdev) 82037bde799SRobert Shearman { 82137bde799SRobert Shearman char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 82237bde799SRobert Shearman struct ctl_table *table; 82337bde799SRobert Shearman int i; 82437bde799SRobert Shearman 82537bde799SRobert Shearman table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 82637bde799SRobert Shearman if (!table) 82737bde799SRobert Shearman goto out; 82837bde799SRobert Shearman 82937bde799SRobert Shearman /* Table data contains only offsets relative to the base of 83037bde799SRobert Shearman * the mdev at this point, so make them absolute. 83137bde799SRobert Shearman */ 83237bde799SRobert Shearman for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) 83337bde799SRobert Shearman table[i].data = (char *)mdev + (uintptr_t)table[i].data; 83437bde799SRobert Shearman 83537bde799SRobert Shearman snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 83637bde799SRobert Shearman 83737bde799SRobert Shearman mdev->sysctl = register_net_sysctl(dev_net(dev), path, table); 83837bde799SRobert Shearman if (!mdev->sysctl) 83937bde799SRobert Shearman goto free; 84037bde799SRobert Shearman 84137bde799SRobert Shearman return 0; 84237bde799SRobert Shearman 84337bde799SRobert Shearman free: 84437bde799SRobert Shearman kfree(table); 84537bde799SRobert Shearman out: 84637bde799SRobert Shearman return -ENOBUFS; 84737bde799SRobert Shearman } 84837bde799SRobert Shearman 84937bde799SRobert Shearman static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev) 85037bde799SRobert Shearman { 85137bde799SRobert Shearman struct ctl_table *table; 85237bde799SRobert Shearman 85337bde799SRobert Shearman table = mdev->sysctl->ctl_table_arg; 85437bde799SRobert Shearman unregister_net_sysctl_table(mdev->sysctl); 85537bde799SRobert Shearman kfree(table); 85637bde799SRobert Shearman } 85737bde799SRobert Shearman 85803c57747SRobert Shearman static struct mpls_dev *mpls_add_dev(struct net_device *dev) 85903c57747SRobert Shearman { 86003c57747SRobert Shearman struct mpls_dev *mdev; 86103c57747SRobert Shearman int err = -ENOMEM; 86203c57747SRobert Shearman 86303c57747SRobert Shearman ASSERT_RTNL(); 86403c57747SRobert Shearman 86503c57747SRobert Shearman mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 86603c57747SRobert Shearman if (!mdev) 86703c57747SRobert Shearman return ERR_PTR(err); 86803c57747SRobert Shearman 86937bde799SRobert Shearman err = mpls_dev_sysctl_register(dev, mdev); 87037bde799SRobert Shearman if (err) 87137bde799SRobert Shearman goto free; 87237bde799SRobert Shearman 87303c57747SRobert Shearman rcu_assign_pointer(dev->mpls_ptr, mdev); 87403c57747SRobert Shearman 87503c57747SRobert Shearman return mdev; 87637bde799SRobert Shearman 87737bde799SRobert Shearman free: 87837bde799SRobert Shearman kfree(mdev); 87937bde799SRobert Shearman return ERR_PTR(err); 88003c57747SRobert Shearman } 88103c57747SRobert Shearman 8820189197fSEric W. Biederman static void mpls_ifdown(struct net_device *dev) 8830189197fSEric W. Biederman { 88419d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 8850189197fSEric W. Biederman struct net *net = dev_net(dev); 88603c57747SRobert Shearman struct mpls_dev *mdev; 8870189197fSEric W. Biederman unsigned index; 8880189197fSEric W. Biederman 88919d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 8900189197fSEric W. Biederman for (index = 0; index < net->mpls.platform_labels; index++) { 89119d0c341SEric W. Biederman struct mpls_route *rt = rtnl_dereference(platform_label[index]); 8920189197fSEric W. Biederman if (!rt) 8930189197fSEric W. Biederman continue; 894f8efb73cSRoopa Prabhu for_nexthops(rt) { 895f8efb73cSRoopa Prabhu if (rtnl_dereference(nh->nh_dev) != dev) 8960189197fSEric W. Biederman continue; 897f8efb73cSRoopa Prabhu nh->nh_dev = NULL; 898f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 8990189197fSEric W. Biederman } 90003c57747SRobert Shearman 90103c57747SRobert Shearman mdev = mpls_dev_get(dev); 90203c57747SRobert Shearman if (!mdev) 90303c57747SRobert Shearman return; 90403c57747SRobert Shearman 90537bde799SRobert Shearman mpls_dev_sysctl_unregister(mdev); 90637bde799SRobert Shearman 90703c57747SRobert Shearman RCU_INIT_POINTER(dev->mpls_ptr, NULL); 90803c57747SRobert Shearman 90925cc8f07SRobert Shearman kfree_rcu(mdev, rcu); 9100189197fSEric W. Biederman } 9110189197fSEric W. Biederman 9120189197fSEric W. Biederman static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 9130189197fSEric W. Biederman void *ptr) 9140189197fSEric W. Biederman { 9150189197fSEric W. Biederman struct net_device *dev = netdev_notifier_info_to_dev(ptr); 91603c57747SRobert Shearman struct mpls_dev *mdev; 9170189197fSEric W. Biederman 9180189197fSEric W. Biederman switch(event) { 91903c57747SRobert Shearman case NETDEV_REGISTER: 92003c57747SRobert Shearman /* For now just support ethernet devices */ 92103c57747SRobert Shearman if ((dev->type == ARPHRD_ETHER) || 92203c57747SRobert Shearman (dev->type == ARPHRD_LOOPBACK)) { 92303c57747SRobert Shearman mdev = mpls_add_dev(dev); 92403c57747SRobert Shearman if (IS_ERR(mdev)) 92503c57747SRobert Shearman return notifier_from_errno(PTR_ERR(mdev)); 92603c57747SRobert Shearman } 92703c57747SRobert Shearman break; 92803c57747SRobert Shearman 9290189197fSEric W. Biederman case NETDEV_UNREGISTER: 9300189197fSEric W. Biederman mpls_ifdown(dev); 9310189197fSEric W. Biederman break; 9320fae3bf0SRobert Shearman case NETDEV_CHANGENAME: 9330fae3bf0SRobert Shearman mdev = mpls_dev_get(dev); 9340fae3bf0SRobert Shearman if (mdev) { 9350fae3bf0SRobert Shearman int err; 9360fae3bf0SRobert Shearman 9370fae3bf0SRobert Shearman mpls_dev_sysctl_unregister(mdev); 9380fae3bf0SRobert Shearman err = mpls_dev_sysctl_register(dev, mdev); 9390fae3bf0SRobert Shearman if (err) 9400fae3bf0SRobert Shearman return notifier_from_errno(err); 9410fae3bf0SRobert Shearman } 9420fae3bf0SRobert Shearman break; 9430189197fSEric W. Biederman } 9440189197fSEric W. Biederman return NOTIFY_OK; 9450189197fSEric W. Biederman } 9460189197fSEric W. Biederman 9470189197fSEric W. Biederman static struct notifier_block mpls_dev_notifier = { 9480189197fSEric W. Biederman .notifier_call = mpls_dev_notify, 9490189197fSEric W. Biederman }; 9500189197fSEric W. Biederman 95103c05665SEric W. Biederman static int nla_put_via(struct sk_buff *skb, 952b79bda3dSEric W. Biederman u8 table, const void *addr, int alen) 95303c05665SEric W. Biederman { 954b79bda3dSEric W. Biederman static const int table_to_family[NEIGH_NR_TABLES + 1] = { 955b79bda3dSEric W. Biederman AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 956b79bda3dSEric W. Biederman }; 95703c05665SEric W. Biederman struct nlattr *nla; 95803c05665SEric W. Biederman struct rtvia *via; 959b79bda3dSEric W. Biederman int family = AF_UNSPEC; 96003c05665SEric W. Biederman 96103c05665SEric W. Biederman nla = nla_reserve(skb, RTA_VIA, alen + 2); 96203c05665SEric W. Biederman if (!nla) 96303c05665SEric W. Biederman return -EMSGSIZE; 96403c05665SEric W. Biederman 965b79bda3dSEric W. Biederman if (table <= NEIGH_NR_TABLES) 966b79bda3dSEric W. Biederman family = table_to_family[table]; 967b79bda3dSEric W. Biederman 96803c05665SEric W. Biederman via = nla_data(nla); 96903c05665SEric W. Biederman via->rtvia_family = family; 97003c05665SEric W. Biederman memcpy(via->rtvia_addr, addr, alen); 97103c05665SEric W. Biederman return 0; 97203c05665SEric W. Biederman } 97303c05665SEric W. Biederman 974966bae33SEric W. Biederman int nla_put_labels(struct sk_buff *skb, int attrtype, 975966bae33SEric W. Biederman u8 labels, const u32 label[]) 976966bae33SEric W. Biederman { 977966bae33SEric W. Biederman struct nlattr *nla; 978966bae33SEric W. Biederman struct mpls_shim_hdr *nla_label; 979966bae33SEric W. Biederman bool bos; 980966bae33SEric W. Biederman int i; 981966bae33SEric W. Biederman nla = nla_reserve(skb, attrtype, labels*4); 982966bae33SEric W. Biederman if (!nla) 983966bae33SEric W. Biederman return -EMSGSIZE; 984966bae33SEric W. Biederman 985966bae33SEric W. Biederman nla_label = nla_data(nla); 986966bae33SEric W. Biederman bos = true; 987966bae33SEric W. Biederman for (i = labels - 1; i >= 0; i--) { 988966bae33SEric W. Biederman nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 989966bae33SEric W. Biederman bos = false; 990966bae33SEric W. Biederman } 991966bae33SEric W. Biederman 992966bae33SEric W. Biederman return 0; 993966bae33SEric W. Biederman } 994face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(nla_put_labels); 995966bae33SEric W. Biederman 996966bae33SEric W. Biederman int nla_get_labels(const struct nlattr *nla, 997f8efb73cSRoopa Prabhu u32 max_labels, u8 *labels, u32 label[]) 998966bae33SEric W. Biederman { 999966bae33SEric W. Biederman unsigned len = nla_len(nla); 1000966bae33SEric W. Biederman unsigned nla_labels; 1001966bae33SEric W. Biederman struct mpls_shim_hdr *nla_label; 1002966bae33SEric W. Biederman bool bos; 1003966bae33SEric W. Biederman int i; 1004966bae33SEric W. Biederman 1005966bae33SEric W. Biederman /* len needs to be an even multiple of 4 (the label size) */ 1006966bae33SEric W. Biederman if (len & 3) 1007966bae33SEric W. Biederman return -EINVAL; 1008966bae33SEric W. Biederman 1009966bae33SEric W. Biederman /* Limit the number of new labels allowed */ 1010966bae33SEric W. Biederman nla_labels = len/4; 1011966bae33SEric W. Biederman if (nla_labels > max_labels) 1012966bae33SEric W. Biederman return -EINVAL; 1013966bae33SEric W. Biederman 1014966bae33SEric W. Biederman nla_label = nla_data(nla); 1015966bae33SEric W. Biederman bos = true; 1016966bae33SEric W. Biederman for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1017966bae33SEric W. Biederman struct mpls_entry_decoded dec; 1018966bae33SEric W. Biederman dec = mpls_entry_decode(nla_label + i); 1019966bae33SEric W. Biederman 1020966bae33SEric W. Biederman /* Ensure the bottom of stack flag is properly set 1021966bae33SEric W. Biederman * and ttl and tc are both clear. 1022966bae33SEric W. Biederman */ 1023966bae33SEric W. Biederman if ((dec.bos != bos) || dec.ttl || dec.tc) 1024966bae33SEric W. Biederman return -EINVAL; 1025966bae33SEric W. Biederman 10265a9ab017SRobert Shearman switch (dec.label) { 102778f5b899STom Herbert case MPLS_LABEL_IMPLNULL: 10285a9ab017SRobert Shearman /* RFC3032: This is a label that an LSR may 10295a9ab017SRobert Shearman * assign and distribute, but which never 10305a9ab017SRobert Shearman * actually appears in the encapsulation. 10315a9ab017SRobert Shearman */ 10325a9ab017SRobert Shearman return -EINVAL; 10335a9ab017SRobert Shearman } 10345a9ab017SRobert Shearman 1035966bae33SEric W. Biederman label[i] = dec.label; 1036966bae33SEric W. Biederman } 1037966bae33SEric W. Biederman *labels = nla_labels; 1038966bae33SEric W. Biederman return 0; 1039966bae33SEric W. Biederman } 1040face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(nla_get_labels); 1041966bae33SEric W. Biederman 1042f8efb73cSRoopa Prabhu int nla_get_via(const struct nlattr *nla, u8 *via_alen, 1043f8efb73cSRoopa Prabhu u8 *via_table, u8 via_addr[]) 1044f8efb73cSRoopa Prabhu { 1045f8efb73cSRoopa Prabhu struct rtvia *via = nla_data(nla); 1046f8efb73cSRoopa Prabhu int err = -EINVAL; 1047f8efb73cSRoopa Prabhu int alen; 1048f8efb73cSRoopa Prabhu 1049f8efb73cSRoopa Prabhu if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) 1050f8efb73cSRoopa Prabhu goto errout; 1051f8efb73cSRoopa Prabhu alen = nla_len(nla) - 1052f8efb73cSRoopa Prabhu offsetof(struct rtvia, rtvia_addr); 1053f8efb73cSRoopa Prabhu if (alen > MAX_VIA_ALEN) 1054f8efb73cSRoopa Prabhu goto errout; 1055f8efb73cSRoopa Prabhu 1056f8efb73cSRoopa Prabhu /* Validate the address family */ 1057f8efb73cSRoopa Prabhu switch (via->rtvia_family) { 1058f8efb73cSRoopa Prabhu case AF_PACKET: 1059f8efb73cSRoopa Prabhu *via_table = NEIGH_LINK_TABLE; 1060f8efb73cSRoopa Prabhu break; 1061f8efb73cSRoopa Prabhu case AF_INET: 1062f8efb73cSRoopa Prabhu *via_table = NEIGH_ARP_TABLE; 1063f8efb73cSRoopa Prabhu if (alen != 4) 1064f8efb73cSRoopa Prabhu goto errout; 1065f8efb73cSRoopa Prabhu break; 1066f8efb73cSRoopa Prabhu case AF_INET6: 1067f8efb73cSRoopa Prabhu *via_table = NEIGH_ND_TABLE; 1068f8efb73cSRoopa Prabhu if (alen != 16) 1069f8efb73cSRoopa Prabhu goto errout; 1070f8efb73cSRoopa Prabhu break; 1071f8efb73cSRoopa Prabhu default: 1072f8efb73cSRoopa Prabhu /* Unsupported address family */ 1073f8efb73cSRoopa Prabhu goto errout; 1074f8efb73cSRoopa Prabhu } 1075f8efb73cSRoopa Prabhu 1076f8efb73cSRoopa Prabhu memcpy(via_addr, via->rtvia_addr, alen); 1077f8efb73cSRoopa Prabhu *via_alen = alen; 1078f8efb73cSRoopa Prabhu err = 0; 1079f8efb73cSRoopa Prabhu 1080f8efb73cSRoopa Prabhu errout: 1081f8efb73cSRoopa Prabhu return err; 1082f8efb73cSRoopa Prabhu } 1083f8efb73cSRoopa Prabhu 108403c05665SEric W. Biederman static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, 108503c05665SEric W. Biederman struct mpls_route_config *cfg) 108603c05665SEric W. Biederman { 108703c05665SEric W. Biederman struct rtmsg *rtm; 108803c05665SEric W. Biederman struct nlattr *tb[RTA_MAX+1]; 108903c05665SEric W. Biederman int index; 109003c05665SEric W. Biederman int err; 109103c05665SEric W. Biederman 109203c05665SEric W. Biederman err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy); 109303c05665SEric W. Biederman if (err < 0) 109403c05665SEric W. Biederman goto errout; 109503c05665SEric W. Biederman 109603c05665SEric W. Biederman err = -EINVAL; 109703c05665SEric W. Biederman rtm = nlmsg_data(nlh); 109803c05665SEric W. Biederman memset(cfg, 0, sizeof(*cfg)); 109903c05665SEric W. Biederman 110003c05665SEric W. Biederman if (rtm->rtm_family != AF_MPLS) 110103c05665SEric W. Biederman goto errout; 110203c05665SEric W. Biederman if (rtm->rtm_dst_len != 20) 110303c05665SEric W. Biederman goto errout; 110403c05665SEric W. Biederman if (rtm->rtm_src_len != 0) 110503c05665SEric W. Biederman goto errout; 110603c05665SEric W. Biederman if (rtm->rtm_tos != 0) 110703c05665SEric W. Biederman goto errout; 110803c05665SEric W. Biederman if (rtm->rtm_table != RT_TABLE_MAIN) 110903c05665SEric W. Biederman goto errout; 111003c05665SEric W. Biederman /* Any value is acceptable for rtm_protocol */ 111103c05665SEric W. Biederman 111203c05665SEric W. Biederman /* As mpls uses destination specific addresses 111303c05665SEric W. Biederman * (or source specific address in the case of multicast) 111403c05665SEric W. Biederman * all addresses have universal scope. 111503c05665SEric W. Biederman */ 111603c05665SEric W. Biederman if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) 111703c05665SEric W. Biederman goto errout; 111803c05665SEric W. Biederman if (rtm->rtm_type != RTN_UNICAST) 111903c05665SEric W. Biederman goto errout; 112003c05665SEric W. Biederman if (rtm->rtm_flags != 0) 112103c05665SEric W. Biederman goto errout; 112203c05665SEric W. Biederman 112303c05665SEric W. Biederman cfg->rc_label = LABEL_NOT_SPECIFIED; 112403c05665SEric W. Biederman cfg->rc_protocol = rtm->rtm_protocol; 112503c05665SEric W. Biederman cfg->rc_nlflags = nlh->nlmsg_flags; 112603c05665SEric W. Biederman cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 112703c05665SEric W. Biederman cfg->rc_nlinfo.nlh = nlh; 112803c05665SEric W. Biederman cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 112903c05665SEric W. Biederman 113003c05665SEric W. Biederman for (index = 0; index <= RTA_MAX; index++) { 113103c05665SEric W. Biederman struct nlattr *nla = tb[index]; 113203c05665SEric W. Biederman if (!nla) 113303c05665SEric W. Biederman continue; 113403c05665SEric W. Biederman 113503c05665SEric W. Biederman switch(index) { 113603c05665SEric W. Biederman case RTA_OIF: 113703c05665SEric W. Biederman cfg->rc_ifindex = nla_get_u32(nla); 113803c05665SEric W. Biederman break; 113903c05665SEric W. Biederman case RTA_NEWDST: 114003c05665SEric W. Biederman if (nla_get_labels(nla, MAX_NEW_LABELS, 114103c05665SEric W. Biederman &cfg->rc_output_labels, 114203c05665SEric W. Biederman cfg->rc_output_label)) 114303c05665SEric W. Biederman goto errout; 114403c05665SEric W. Biederman break; 114503c05665SEric W. Biederman case RTA_DST: 114603c05665SEric W. Biederman { 1147f8efb73cSRoopa Prabhu u8 label_count; 114803c05665SEric W. Biederman if (nla_get_labels(nla, 1, &label_count, 114903c05665SEric W. Biederman &cfg->rc_label)) 115003c05665SEric W. Biederman goto errout; 115103c05665SEric W. Biederman 1152a6affd24SRobert Shearman /* Reserved labels may not be set */ 1153a6affd24SRobert Shearman if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED) 115403c05665SEric W. Biederman goto errout; 115503c05665SEric W. Biederman 115603c05665SEric W. Biederman break; 115703c05665SEric W. Biederman } 115803c05665SEric W. Biederman case RTA_VIA: 115903c05665SEric W. Biederman { 1160f8efb73cSRoopa Prabhu if (nla_get_via(nla, &cfg->rc_via_alen, 1161f8efb73cSRoopa Prabhu &cfg->rc_via_table, cfg->rc_via)) 116203c05665SEric W. Biederman goto errout; 116303c05665SEric W. Biederman break; 116403c05665SEric W. Biederman } 1165f8efb73cSRoopa Prabhu case RTA_MULTIPATH: 1166f8efb73cSRoopa Prabhu { 1167f8efb73cSRoopa Prabhu cfg->rc_mp = nla_data(nla); 1168f8efb73cSRoopa Prabhu cfg->rc_mp_len = nla_len(nla); 116903c05665SEric W. Biederman break; 117003c05665SEric W. Biederman } 117103c05665SEric W. Biederman default: 117203c05665SEric W. Biederman /* Unsupported attribute */ 117303c05665SEric W. Biederman goto errout; 117403c05665SEric W. Biederman } 117503c05665SEric W. Biederman } 117603c05665SEric W. Biederman 117703c05665SEric W. Biederman err = 0; 117803c05665SEric W. Biederman errout: 117903c05665SEric W. Biederman return err; 118003c05665SEric W. Biederman } 118103c05665SEric W. Biederman 118203c05665SEric W. Biederman static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) 118303c05665SEric W. Biederman { 118403c05665SEric W. Biederman struct mpls_route_config cfg; 118503c05665SEric W. Biederman int err; 118603c05665SEric W. Biederman 118703c05665SEric W. Biederman err = rtm_to_route_config(skb, nlh, &cfg); 118803c05665SEric W. Biederman if (err < 0) 118903c05665SEric W. Biederman return err; 119003c05665SEric W. Biederman 119103c05665SEric W. Biederman return mpls_route_del(&cfg); 119203c05665SEric W. Biederman } 119303c05665SEric W. Biederman 119403c05665SEric W. Biederman 119503c05665SEric W. Biederman static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) 119603c05665SEric W. Biederman { 119703c05665SEric W. Biederman struct mpls_route_config cfg; 119803c05665SEric W. Biederman int err; 119903c05665SEric W. Biederman 120003c05665SEric W. Biederman err = rtm_to_route_config(skb, nlh, &cfg); 120103c05665SEric W. Biederman if (err < 0) 120203c05665SEric W. Biederman return err; 120303c05665SEric W. Biederman 120403c05665SEric W. Biederman return mpls_route_add(&cfg); 120503c05665SEric W. Biederman } 120603c05665SEric W. Biederman 120703c05665SEric W. Biederman static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 120803c05665SEric W. Biederman u32 label, struct mpls_route *rt, int flags) 120903c05665SEric W. Biederman { 121019d0c341SEric W. Biederman struct net_device *dev; 121103c05665SEric W. Biederman struct nlmsghdr *nlh; 121203c05665SEric W. Biederman struct rtmsg *rtm; 121303c05665SEric W. Biederman 121403c05665SEric W. Biederman nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 121503c05665SEric W. Biederman if (nlh == NULL) 121603c05665SEric W. Biederman return -EMSGSIZE; 121703c05665SEric W. Biederman 121803c05665SEric W. Biederman rtm = nlmsg_data(nlh); 121903c05665SEric W. Biederman rtm->rtm_family = AF_MPLS; 122003c05665SEric W. Biederman rtm->rtm_dst_len = 20; 122103c05665SEric W. Biederman rtm->rtm_src_len = 0; 122203c05665SEric W. Biederman rtm->rtm_tos = 0; 122303c05665SEric W. Biederman rtm->rtm_table = RT_TABLE_MAIN; 122403c05665SEric W. Biederman rtm->rtm_protocol = rt->rt_protocol; 122503c05665SEric W. Biederman rtm->rtm_scope = RT_SCOPE_UNIVERSE; 122603c05665SEric W. Biederman rtm->rtm_type = RTN_UNICAST; 122703c05665SEric W. Biederman rtm->rtm_flags = 0; 122803c05665SEric W. Biederman 122903c05665SEric W. Biederman if (nla_put_labels(skb, RTA_DST, 1, &label)) 123003c05665SEric W. Biederman goto nla_put_failure; 1231f8efb73cSRoopa Prabhu if (rt->rt_nhn == 1) { 1232cf4b24f0SRobert Shearman const struct mpls_nh *nh = rt->rt_nh; 1233f8efb73cSRoopa Prabhu 1234f8efb73cSRoopa Prabhu if (nh->nh_labels && 1235f8efb73cSRoopa Prabhu nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 1236f8efb73cSRoopa Prabhu nh->nh_label)) 1237f8efb73cSRoopa Prabhu goto nla_put_failure; 1238cf4b24f0SRobert Shearman if (nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 1239f8efb73cSRoopa Prabhu nh->nh_via_alen)) 1240f8efb73cSRoopa Prabhu goto nla_put_failure; 1241f8efb73cSRoopa Prabhu dev = rtnl_dereference(nh->nh_dev); 1242f8efb73cSRoopa Prabhu if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 1243f8efb73cSRoopa Prabhu goto nla_put_failure; 1244f8efb73cSRoopa Prabhu } else { 1245f8efb73cSRoopa Prabhu struct rtnexthop *rtnh; 1246f8efb73cSRoopa Prabhu struct nlattr *mp; 1247f8efb73cSRoopa Prabhu 1248f8efb73cSRoopa Prabhu mp = nla_nest_start(skb, RTA_MULTIPATH); 1249f8efb73cSRoopa Prabhu if (!mp) 1250f8efb73cSRoopa Prabhu goto nla_put_failure; 1251f8efb73cSRoopa Prabhu 1252f8efb73cSRoopa Prabhu for_nexthops(rt) { 1253f8efb73cSRoopa Prabhu rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 1254f8efb73cSRoopa Prabhu if (!rtnh) 1255f8efb73cSRoopa Prabhu goto nla_put_failure; 1256f8efb73cSRoopa Prabhu 1257f8efb73cSRoopa Prabhu dev = rtnl_dereference(nh->nh_dev); 1258f8efb73cSRoopa Prabhu if (dev) 1259f8efb73cSRoopa Prabhu rtnh->rtnh_ifindex = dev->ifindex; 1260f8efb73cSRoopa Prabhu if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 1261f8efb73cSRoopa Prabhu nh->nh_labels, 1262f8efb73cSRoopa Prabhu nh->nh_label)) 1263f8efb73cSRoopa Prabhu goto nla_put_failure; 1264f8efb73cSRoopa Prabhu if (nla_put_via(skb, nh->nh_via_table, 1265cf4b24f0SRobert Shearman mpls_nh_via(rt, nh), 1266f8efb73cSRoopa Prabhu nh->nh_via_alen)) 1267f8efb73cSRoopa Prabhu goto nla_put_failure; 1268f8efb73cSRoopa Prabhu 1269f8efb73cSRoopa Prabhu /* length of rtnetlink header + attributes */ 1270f8efb73cSRoopa Prabhu rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 1271f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 1272f8efb73cSRoopa Prabhu 1273f8efb73cSRoopa Prabhu nla_nest_end(skb, mp); 1274f8efb73cSRoopa Prabhu } 127503c05665SEric W. Biederman 127603c05665SEric W. Biederman nlmsg_end(skb, nlh); 127703c05665SEric W. Biederman return 0; 127803c05665SEric W. Biederman 127903c05665SEric W. Biederman nla_put_failure: 128003c05665SEric W. Biederman nlmsg_cancel(skb, nlh); 128103c05665SEric W. Biederman return -EMSGSIZE; 128203c05665SEric W. Biederman } 128303c05665SEric W. Biederman 128403c05665SEric W. Biederman static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 128503c05665SEric W. Biederman { 128603c05665SEric W. Biederman struct net *net = sock_net(skb->sk); 128719d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 128819d0c341SEric W. Biederman size_t platform_labels; 128903c05665SEric W. Biederman unsigned int index; 129003c05665SEric W. Biederman 129103c05665SEric W. Biederman ASSERT_RTNL(); 129203c05665SEric W. Biederman 129303c05665SEric W. Biederman index = cb->args[0]; 1294a6affd24SRobert Shearman if (index < MPLS_LABEL_FIRST_UNRESERVED) 1295a6affd24SRobert Shearman index = MPLS_LABEL_FIRST_UNRESERVED; 129603c05665SEric W. Biederman 129719d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 129819d0c341SEric W. Biederman platform_labels = net->mpls.platform_labels; 129919d0c341SEric W. Biederman for (; index < platform_labels; index++) { 130003c05665SEric W. Biederman struct mpls_route *rt; 130119d0c341SEric W. Biederman rt = rtnl_dereference(platform_label[index]); 130203c05665SEric W. Biederman if (!rt) 130303c05665SEric W. Biederman continue; 130403c05665SEric W. Biederman 130503c05665SEric W. Biederman if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 130603c05665SEric W. Biederman cb->nlh->nlmsg_seq, RTM_NEWROUTE, 130703c05665SEric W. Biederman index, rt, NLM_F_MULTI) < 0) 130803c05665SEric W. Biederman break; 130903c05665SEric W. Biederman } 131003c05665SEric W. Biederman cb->args[0] = index; 131103c05665SEric W. Biederman 131203c05665SEric W. Biederman return skb->len; 131303c05665SEric W. Biederman } 131403c05665SEric W. Biederman 13158de147dcSEric W. Biederman static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 13168de147dcSEric W. Biederman { 13178de147dcSEric W. Biederman size_t payload = 13188de147dcSEric W. Biederman NLMSG_ALIGN(sizeof(struct rtmsg)) 13198de147dcSEric W. Biederman + nla_total_size(4); /* RTA_DST */ 1320f8efb73cSRoopa Prabhu 1321f8efb73cSRoopa Prabhu if (rt->rt_nhn == 1) { 1322f8efb73cSRoopa Prabhu struct mpls_nh *nh = rt->rt_nh; 1323f8efb73cSRoopa Prabhu 1324f8efb73cSRoopa Prabhu if (nh->nh_dev) 1325f8efb73cSRoopa Prabhu payload += nla_total_size(4); /* RTA_OIF */ 1326f8efb73cSRoopa Prabhu payload += nla_total_size(2 + nh->nh_via_alen); /* RTA_VIA */ 1327f8efb73cSRoopa Prabhu if (nh->nh_labels) /* RTA_NEWDST */ 1328f8efb73cSRoopa Prabhu payload += nla_total_size(nh->nh_labels * 4); 1329f8efb73cSRoopa Prabhu } else { 1330f8efb73cSRoopa Prabhu /* each nexthop is packed in an attribute */ 1331f8efb73cSRoopa Prabhu size_t nhsize = 0; 1332f8efb73cSRoopa Prabhu 1333f8efb73cSRoopa Prabhu for_nexthops(rt) { 1334f8efb73cSRoopa Prabhu nhsize += nla_total_size(sizeof(struct rtnexthop)); 1335f8efb73cSRoopa Prabhu nhsize += nla_total_size(2 + nh->nh_via_alen); 1336f8efb73cSRoopa Prabhu if (nh->nh_labels) 1337f8efb73cSRoopa Prabhu nhsize += nla_total_size(nh->nh_labels * 4); 1338f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 1339f8efb73cSRoopa Prabhu /* nested attribute */ 1340f8efb73cSRoopa Prabhu payload += nla_total_size(nhsize); 1341f8efb73cSRoopa Prabhu } 1342f8efb73cSRoopa Prabhu 13438de147dcSEric W. Biederman return payload; 13448de147dcSEric W. Biederman } 13458de147dcSEric W. Biederman 13468de147dcSEric W. Biederman static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 13478de147dcSEric W. Biederman struct nlmsghdr *nlh, struct net *net, u32 portid, 13488de147dcSEric W. Biederman unsigned int nlm_flags) 13498de147dcSEric W. Biederman { 13508de147dcSEric W. Biederman struct sk_buff *skb; 13518de147dcSEric W. Biederman u32 seq = nlh ? nlh->nlmsg_seq : 0; 13528de147dcSEric W. Biederman int err = -ENOBUFS; 13538de147dcSEric W. Biederman 13548de147dcSEric W. Biederman skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 13558de147dcSEric W. Biederman if (skb == NULL) 13568de147dcSEric W. Biederman goto errout; 13578de147dcSEric W. Biederman 13588de147dcSEric W. Biederman err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 13598de147dcSEric W. Biederman if (err < 0) { 13608de147dcSEric W. Biederman /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 13618de147dcSEric W. Biederman WARN_ON(err == -EMSGSIZE); 13628de147dcSEric W. Biederman kfree_skb(skb); 13638de147dcSEric W. Biederman goto errout; 13648de147dcSEric W. Biederman } 13658de147dcSEric W. Biederman rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 13668de147dcSEric W. Biederman 13678de147dcSEric W. Biederman return; 13688de147dcSEric W. Biederman errout: 13698de147dcSEric W. Biederman if (err < 0) 13708de147dcSEric W. Biederman rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 13718de147dcSEric W. Biederman } 13728de147dcSEric W. Biederman 13737720c01fSEric W. Biederman static int resize_platform_label_table(struct net *net, size_t limit) 13747720c01fSEric W. Biederman { 13757720c01fSEric W. Biederman size_t size = sizeof(struct mpls_route *) * limit; 13767720c01fSEric W. Biederman size_t old_limit; 13777720c01fSEric W. Biederman size_t cp_size; 13787720c01fSEric W. Biederman struct mpls_route __rcu **labels = NULL, **old; 13797720c01fSEric W. Biederman struct mpls_route *rt0 = NULL, *rt2 = NULL; 13807720c01fSEric W. Biederman unsigned index; 13817720c01fSEric W. Biederman 13827720c01fSEric W. Biederman if (size) { 13837720c01fSEric W. Biederman labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); 13847720c01fSEric W. Biederman if (!labels) 13857720c01fSEric W. Biederman labels = vzalloc(size); 13867720c01fSEric W. Biederman 13877720c01fSEric W. Biederman if (!labels) 13887720c01fSEric W. Biederman goto nolabels; 13897720c01fSEric W. Biederman } 13907720c01fSEric W. Biederman 13917720c01fSEric W. Biederman /* In case the predefined labels need to be populated */ 139278f5b899STom Herbert if (limit > MPLS_LABEL_IPV4NULL) { 13937720c01fSEric W. Biederman struct net_device *lo = net->loopback_dev; 1394cf4b24f0SRobert Shearman rt0 = mpls_rt_alloc(1, lo->addr_len); 13957720c01fSEric W. Biederman if (!rt0) 13967720c01fSEric W. Biederman goto nort0; 1397f8efb73cSRoopa Prabhu RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 13987720c01fSEric W. Biederman rt0->rt_protocol = RTPROT_KERNEL; 1399118d5234SRobert Shearman rt0->rt_payload_type = MPT_IPV4; 1400f8efb73cSRoopa Prabhu rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 1401b4e04fc7SRobert Shearman rt0->rt_nh->nh_via_alen = lo->addr_len; 1402cf4b24f0SRobert Shearman memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 1403cf4b24f0SRobert Shearman lo->addr_len); 14047720c01fSEric W. Biederman } 140578f5b899STom Herbert if (limit > MPLS_LABEL_IPV6NULL) { 14067720c01fSEric W. Biederman struct net_device *lo = net->loopback_dev; 1407cf4b24f0SRobert Shearman rt2 = mpls_rt_alloc(1, lo->addr_len); 14087720c01fSEric W. Biederman if (!rt2) 14097720c01fSEric W. Biederman goto nort2; 1410f8efb73cSRoopa Prabhu RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 14117720c01fSEric W. Biederman rt2->rt_protocol = RTPROT_KERNEL; 1412118d5234SRobert Shearman rt2->rt_payload_type = MPT_IPV6; 1413f8efb73cSRoopa Prabhu rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 1414b4e04fc7SRobert Shearman rt2->rt_nh->nh_via_alen = lo->addr_len; 1415cf4b24f0SRobert Shearman memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 1416cf4b24f0SRobert Shearman lo->addr_len); 14177720c01fSEric W. Biederman } 14187720c01fSEric W. Biederman 14197720c01fSEric W. Biederman rtnl_lock(); 14207720c01fSEric W. Biederman /* Remember the original table */ 142119d0c341SEric W. Biederman old = rtnl_dereference(net->mpls.platform_label); 14227720c01fSEric W. Biederman old_limit = net->mpls.platform_labels; 14237720c01fSEric W. Biederman 14247720c01fSEric W. Biederman /* Free any labels beyond the new table */ 14257720c01fSEric W. Biederman for (index = limit; index < old_limit; index++) 1426f8efb73cSRoopa Prabhu mpls_route_update(net, index, NULL, NULL); 14277720c01fSEric W. Biederman 14287720c01fSEric W. Biederman /* Copy over the old labels */ 14297720c01fSEric W. Biederman cp_size = size; 14307720c01fSEric W. Biederman if (old_limit < limit) 14317720c01fSEric W. Biederman cp_size = old_limit * sizeof(struct mpls_route *); 14327720c01fSEric W. Biederman 14337720c01fSEric W. Biederman memcpy(labels, old, cp_size); 14347720c01fSEric W. Biederman 14357720c01fSEric W. Biederman /* If needed set the predefined labels */ 143678f5b899STom Herbert if ((old_limit <= MPLS_LABEL_IPV6NULL) && 143778f5b899STom Herbert (limit > MPLS_LABEL_IPV6NULL)) { 143878f5b899STom Herbert RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 14397720c01fSEric W. Biederman rt2 = NULL; 14407720c01fSEric W. Biederman } 14417720c01fSEric W. Biederman 144278f5b899STom Herbert if ((old_limit <= MPLS_LABEL_IPV4NULL) && 144378f5b899STom Herbert (limit > MPLS_LABEL_IPV4NULL)) { 144478f5b899STom Herbert RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 14457720c01fSEric W. Biederman rt0 = NULL; 14467720c01fSEric W. Biederman } 14477720c01fSEric W. Biederman 14487720c01fSEric W. Biederman /* Update the global pointers */ 14497720c01fSEric W. Biederman net->mpls.platform_labels = limit; 145019d0c341SEric W. Biederman rcu_assign_pointer(net->mpls.platform_label, labels); 14517720c01fSEric W. Biederman 14527720c01fSEric W. Biederman rtnl_unlock(); 14537720c01fSEric W. Biederman 14547720c01fSEric W. Biederman mpls_rt_free(rt2); 14557720c01fSEric W. Biederman mpls_rt_free(rt0); 14567720c01fSEric W. Biederman 14577720c01fSEric W. Biederman if (old) { 14587720c01fSEric W. Biederman synchronize_rcu(); 14597720c01fSEric W. Biederman kvfree(old); 14607720c01fSEric W. Biederman } 14617720c01fSEric W. Biederman return 0; 14627720c01fSEric W. Biederman 14637720c01fSEric W. Biederman nort2: 14647720c01fSEric W. Biederman mpls_rt_free(rt0); 14657720c01fSEric W. Biederman nort0: 14667720c01fSEric W. Biederman kvfree(labels); 14677720c01fSEric W. Biederman nolabels: 14687720c01fSEric W. Biederman return -ENOMEM; 14697720c01fSEric W. Biederman } 14707720c01fSEric W. Biederman 14717720c01fSEric W. Biederman static int mpls_platform_labels(struct ctl_table *table, int write, 14727720c01fSEric W. Biederman void __user *buffer, size_t *lenp, loff_t *ppos) 14737720c01fSEric W. Biederman { 14747720c01fSEric W. Biederman struct net *net = table->data; 14757720c01fSEric W. Biederman int platform_labels = net->mpls.platform_labels; 14767720c01fSEric W. Biederman int ret; 14777720c01fSEric W. Biederman struct ctl_table tmp = { 14787720c01fSEric W. Biederman .procname = table->procname, 14797720c01fSEric W. Biederman .data = &platform_labels, 14807720c01fSEric W. Biederman .maxlen = sizeof(int), 14817720c01fSEric W. Biederman .mode = table->mode, 14827720c01fSEric W. Biederman .extra1 = &zero, 14837720c01fSEric W. Biederman .extra2 = &label_limit, 14847720c01fSEric W. Biederman }; 14857720c01fSEric W. Biederman 14867720c01fSEric W. Biederman ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 14877720c01fSEric W. Biederman 14887720c01fSEric W. Biederman if (write && ret == 0) 14897720c01fSEric W. Biederman ret = resize_platform_label_table(net, platform_labels); 14907720c01fSEric W. Biederman 14917720c01fSEric W. Biederman return ret; 14927720c01fSEric W. Biederman } 14937720c01fSEric W. Biederman 149437bde799SRobert Shearman static const struct ctl_table mpls_table[] = { 14957720c01fSEric W. Biederman { 14967720c01fSEric W. Biederman .procname = "platform_labels", 14977720c01fSEric W. Biederman .data = NULL, 14987720c01fSEric W. Biederman .maxlen = sizeof(int), 14997720c01fSEric W. Biederman .mode = 0644, 15007720c01fSEric W. Biederman .proc_handler = mpls_platform_labels, 15017720c01fSEric W. Biederman }, 15027720c01fSEric W. Biederman { } 15037720c01fSEric W. Biederman }; 15047720c01fSEric W. Biederman 15050189197fSEric W. Biederman static int mpls_net_init(struct net *net) 15060189197fSEric W. Biederman { 15077720c01fSEric W. Biederman struct ctl_table *table; 15087720c01fSEric W. Biederman 15090189197fSEric W. Biederman net->mpls.platform_labels = 0; 15100189197fSEric W. Biederman net->mpls.platform_label = NULL; 15110189197fSEric W. Biederman 15127720c01fSEric W. Biederman table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 15137720c01fSEric W. Biederman if (table == NULL) 15147720c01fSEric W. Biederman return -ENOMEM; 15157720c01fSEric W. Biederman 15167720c01fSEric W. Biederman table[0].data = net; 15177720c01fSEric W. Biederman net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 15186ea3c9d5SNikolay Aleksandrov if (net->mpls.ctl == NULL) { 15196ea3c9d5SNikolay Aleksandrov kfree(table); 15207720c01fSEric W. Biederman return -ENOMEM; 15216ea3c9d5SNikolay Aleksandrov } 15227720c01fSEric W. Biederman 15230189197fSEric W. Biederman return 0; 15240189197fSEric W. Biederman } 15250189197fSEric W. Biederman 15260189197fSEric W. Biederman static void mpls_net_exit(struct net *net) 15270189197fSEric W. Biederman { 152819d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 152919d0c341SEric W. Biederman size_t platform_labels; 15307720c01fSEric W. Biederman struct ctl_table *table; 15310189197fSEric W. Biederman unsigned int index; 15320189197fSEric W. Biederman 15337720c01fSEric W. Biederman table = net->mpls.ctl->ctl_table_arg; 15347720c01fSEric W. Biederman unregister_net_sysctl_table(net->mpls.ctl); 15357720c01fSEric W. Biederman kfree(table); 15367720c01fSEric W. Biederman 153719d0c341SEric W. Biederman /* An rcu grace period has passed since there was a device in 153819d0c341SEric W. Biederman * the network namespace (and thus the last in flight packet) 15390189197fSEric W. Biederman * left this network namespace. This is because 15400189197fSEric W. Biederman * unregister_netdevice_many and netdev_run_todo has completed 15410189197fSEric W. Biederman * for each network device that was in this network namespace. 15420189197fSEric W. Biederman * 15430189197fSEric W. Biederman * As such no additional rcu synchronization is necessary when 15440189197fSEric W. Biederman * freeing the platform_label table. 15450189197fSEric W. Biederman */ 15460189197fSEric W. Biederman rtnl_lock(); 154719d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 154819d0c341SEric W. Biederman platform_labels = net->mpls.platform_labels; 154919d0c341SEric W. Biederman for (index = 0; index < platform_labels; index++) { 155019d0c341SEric W. Biederman struct mpls_route *rt = rtnl_dereference(platform_label[index]); 155119d0c341SEric W. Biederman RCU_INIT_POINTER(platform_label[index], NULL); 15520189197fSEric W. Biederman mpls_rt_free(rt); 15530189197fSEric W. Biederman } 15540189197fSEric W. Biederman rtnl_unlock(); 15550189197fSEric W. Biederman 155619d0c341SEric W. Biederman kvfree(platform_label); 15570189197fSEric W. Biederman } 15580189197fSEric W. Biederman 15590189197fSEric W. Biederman static struct pernet_operations mpls_net_ops = { 15600189197fSEric W. Biederman .init = mpls_net_init, 15610189197fSEric W. Biederman .exit = mpls_net_exit, 15620189197fSEric W. Biederman }; 15630189197fSEric W. Biederman 15640189197fSEric W. Biederman static int __init mpls_init(void) 15650189197fSEric W. Biederman { 15660189197fSEric W. Biederman int err; 15670189197fSEric W. Biederman 15680189197fSEric W. Biederman BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 15690189197fSEric W. Biederman 15700189197fSEric W. Biederman err = register_pernet_subsys(&mpls_net_ops); 15710189197fSEric W. Biederman if (err) 15720189197fSEric W. Biederman goto out; 15730189197fSEric W. Biederman 15740189197fSEric W. Biederman err = register_netdevice_notifier(&mpls_dev_notifier); 15750189197fSEric W. Biederman if (err) 15760189197fSEric W. Biederman goto out_unregister_pernet; 15770189197fSEric W. Biederman 15780189197fSEric W. Biederman dev_add_pack(&mpls_packet_type); 15790189197fSEric W. Biederman 158003c05665SEric W. Biederman rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL); 158103c05665SEric W. Biederman rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL); 158203c05665SEric W. Biederman rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL); 15830189197fSEric W. Biederman err = 0; 15840189197fSEric W. Biederman out: 15850189197fSEric W. Biederman return err; 15860189197fSEric W. Biederman 15870189197fSEric W. Biederman out_unregister_pernet: 15880189197fSEric W. Biederman unregister_pernet_subsys(&mpls_net_ops); 15890189197fSEric W. Biederman goto out; 15900189197fSEric W. Biederman } 15910189197fSEric W. Biederman module_init(mpls_init); 15920189197fSEric W. Biederman 15930189197fSEric W. Biederman static void __exit mpls_exit(void) 15940189197fSEric W. Biederman { 159503c05665SEric W. Biederman rtnl_unregister_all(PF_MPLS); 15960189197fSEric W. Biederman dev_remove_pack(&mpls_packet_type); 15970189197fSEric W. Biederman unregister_netdevice_notifier(&mpls_dev_notifier); 15980189197fSEric W. Biederman unregister_pernet_subsys(&mpls_net_ops); 15990189197fSEric W. Biederman } 16000189197fSEric W. Biederman module_exit(mpls_exit); 16010189197fSEric W. Biederman 16020189197fSEric W. Biederman MODULE_DESCRIPTION("MultiProtocol Label Switching"); 16030189197fSEric W. Biederman MODULE_LICENSE("GPL v2"); 16040189197fSEric W. Biederman MODULE_ALIAS_NETPROTO(PF_MPLS); 1605