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 30eb7809f0SRobert Shearman #define MPLS_NEIGH_TABLE_UNSPEC (NEIGH_LINK_TABLE + 1) 31eb7809f0SRobert Shearman 327720c01fSEric W. Biederman static int zero = 0; 337720c01fSEric W. Biederman static int label_limit = (1 << 20) - 1; 347720c01fSEric W. Biederman 358de147dcSEric W. Biederman static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 368de147dcSEric W. Biederman struct nlmsghdr *nlh, struct net *net, u32 portid, 378de147dcSEric W. Biederman unsigned int nlm_flags); 388de147dcSEric W. Biederman 390189197fSEric W. Biederman static struct mpls_route *mpls_route_input_rcu(struct net *net, unsigned index) 400189197fSEric W. Biederman { 410189197fSEric W. Biederman struct mpls_route *rt = NULL; 420189197fSEric W. Biederman 430189197fSEric W. Biederman if (index < net->mpls.platform_labels) { 440189197fSEric W. Biederman struct mpls_route __rcu **platform_label = 450189197fSEric W. Biederman rcu_dereference(net->mpls.platform_label); 460189197fSEric W. Biederman rt = rcu_dereference(platform_label[index]); 470189197fSEric W. Biederman } 480189197fSEric W. Biederman return rt; 490189197fSEric W. Biederman } 500189197fSEric W. Biederman 5103c57747SRobert Shearman static inline struct mpls_dev *mpls_dev_get(const struct net_device *dev) 5203c57747SRobert Shearman { 5303c57747SRobert Shearman return rcu_dereference_rtnl(dev->mpls_ptr); 5403c57747SRobert Shearman } 5503c57747SRobert Shearman 56face0188SRoopa Prabhu bool mpls_output_possible(const struct net_device *dev) 570189197fSEric W. Biederman { 580189197fSEric W. Biederman return dev && (dev->flags & IFF_UP) && netif_carrier_ok(dev); 590189197fSEric W. Biederman } 60face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(mpls_output_possible); 610189197fSEric W. Biederman 62cf4b24f0SRobert Shearman static u8 *__mpls_nh_via(struct mpls_route *rt, struct mpls_nh *nh) 63cf4b24f0SRobert Shearman { 64cf4b24f0SRobert Shearman u8 *nh0_via = PTR_ALIGN((u8 *)&rt->rt_nh[rt->rt_nhn], VIA_ALEN_ALIGN); 65cf4b24f0SRobert Shearman int nh_index = nh - rt->rt_nh; 66cf4b24f0SRobert Shearman 67cf4b24f0SRobert Shearman return nh0_via + rt->rt_max_alen * nh_index; 68cf4b24f0SRobert Shearman } 69cf4b24f0SRobert Shearman 70cf4b24f0SRobert Shearman static const u8 *mpls_nh_via(const struct mpls_route *rt, 71cf4b24f0SRobert Shearman const struct mpls_nh *nh) 72cf4b24f0SRobert Shearman { 73cf4b24f0SRobert Shearman return __mpls_nh_via((struct mpls_route *)rt, (struct mpls_nh *)nh); 74cf4b24f0SRobert Shearman } 75cf4b24f0SRobert Shearman 76f8efb73cSRoopa Prabhu static unsigned int mpls_nh_header_size(const struct mpls_nh *nh) 770189197fSEric W. Biederman { 780189197fSEric W. Biederman /* The size of the layer 2.5 labels to be added for this route */ 79f8efb73cSRoopa Prabhu return nh->nh_labels * sizeof(struct mpls_shim_hdr); 800189197fSEric W. Biederman } 810189197fSEric W. Biederman 82face0188SRoopa Prabhu unsigned int mpls_dev_mtu(const struct net_device *dev) 830189197fSEric W. Biederman { 840189197fSEric W. Biederman /* The amount of data the layer 2 frame can hold */ 850189197fSEric W. Biederman return dev->mtu; 860189197fSEric W. Biederman } 87face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(mpls_dev_mtu); 880189197fSEric W. Biederman 89face0188SRoopa Prabhu bool mpls_pkt_too_big(const struct sk_buff *skb, unsigned int mtu) 900189197fSEric W. Biederman { 910189197fSEric W. Biederman if (skb->len <= mtu) 920189197fSEric W. Biederman return false; 930189197fSEric W. Biederman 94ae7ef81eSMarcelo Ricardo Leitner if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu)) 950189197fSEric W. Biederman return false; 960189197fSEric W. Biederman 970189197fSEric W. Biederman return true; 980189197fSEric W. Biederman } 99face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(mpls_pkt_too_big); 1000189197fSEric W. Biederman 101*9f427a0eSDavid Ahern static u32 mpls_multipath_hash(struct mpls_route *rt, struct sk_buff *skb) 102f8efb73cSRoopa Prabhu { 1031c78efa8SRobert Shearman struct mpls_entry_decoded dec; 104*9f427a0eSDavid Ahern unsigned int mpls_hdr_len = 0; 1051c78efa8SRobert Shearman struct mpls_shim_hdr *hdr; 1061c78efa8SRobert Shearman bool eli_seen = false; 1071c78efa8SRobert Shearman int label_index; 1081c78efa8SRobert Shearman u32 hash = 0; 1091c78efa8SRobert Shearman 110*9f427a0eSDavid Ahern for (label_index = 0; label_index < MAX_MP_SELECT_LABELS; 1111c78efa8SRobert Shearman label_index++) { 112*9f427a0eSDavid Ahern mpls_hdr_len += sizeof(*hdr); 113*9f427a0eSDavid Ahern if (!pskb_may_pull(skb, mpls_hdr_len)) 1141c78efa8SRobert Shearman break; 1151c78efa8SRobert Shearman 1161c78efa8SRobert Shearman /* Read and decode the current label */ 1171c78efa8SRobert Shearman hdr = mpls_hdr(skb) + label_index; 1181c78efa8SRobert Shearman dec = mpls_entry_decode(hdr); 1191c78efa8SRobert Shearman 1201c78efa8SRobert Shearman /* RFC6790 - reserved labels MUST NOT be used as keys 1211c78efa8SRobert Shearman * for the load-balancing function 1221c78efa8SRobert Shearman */ 1231c78efa8SRobert Shearman if (likely(dec.label >= MPLS_LABEL_FIRST_UNRESERVED)) { 1241c78efa8SRobert Shearman hash = jhash_1word(dec.label, hash); 1251c78efa8SRobert Shearman 1261c78efa8SRobert Shearman /* The entropy label follows the entropy label 1271c78efa8SRobert Shearman * indicator, so this means that the entropy 1281c78efa8SRobert Shearman * label was just added to the hash - no need to 1291c78efa8SRobert Shearman * go any deeper either in the label stack or in the 1301c78efa8SRobert Shearman * payload 1311c78efa8SRobert Shearman */ 1321c78efa8SRobert Shearman if (eli_seen) 1331c78efa8SRobert Shearman break; 1341c78efa8SRobert Shearman } else if (dec.label == MPLS_LABEL_ENTROPY) { 1351c78efa8SRobert Shearman eli_seen = true; 1361c78efa8SRobert Shearman } 1371c78efa8SRobert Shearman 138*9f427a0eSDavid Ahern if (!dec.bos) 139*9f427a0eSDavid Ahern continue; 140*9f427a0eSDavid Ahern 141*9f427a0eSDavid Ahern /* found bottom label; does skb have room for a header? */ 142*9f427a0eSDavid Ahern if (pskb_may_pull(skb, mpls_hdr_len + sizeof(struct iphdr))) { 1431c78efa8SRobert Shearman const struct iphdr *v4hdr; 1441c78efa8SRobert Shearman 145*9f427a0eSDavid Ahern v4hdr = (const struct iphdr *)(hdr + 1); 1461c78efa8SRobert Shearman if (v4hdr->version == 4) { 1471c78efa8SRobert Shearman hash = jhash_3words(ntohl(v4hdr->saddr), 1481c78efa8SRobert Shearman ntohl(v4hdr->daddr), 1491c78efa8SRobert Shearman v4hdr->protocol, hash); 1501c78efa8SRobert Shearman } else if (v4hdr->version == 6 && 151*9f427a0eSDavid Ahern pskb_may_pull(skb, mpls_hdr_len + 1521c78efa8SRobert Shearman sizeof(struct ipv6hdr))) { 1531c78efa8SRobert Shearman const struct ipv6hdr *v6hdr; 1541c78efa8SRobert Shearman 155*9f427a0eSDavid Ahern v6hdr = (const struct ipv6hdr *)(hdr + 1); 1561c78efa8SRobert Shearman hash = __ipv6_addr_jhash(&v6hdr->saddr, hash); 1571c78efa8SRobert Shearman hash = __ipv6_addr_jhash(&v6hdr->daddr, hash); 1581c78efa8SRobert Shearman hash = jhash_1word(v6hdr->nexthdr, hash); 1591c78efa8SRobert Shearman } 1601c78efa8SRobert Shearman } 161*9f427a0eSDavid Ahern 162*9f427a0eSDavid Ahern break; 1631c78efa8SRobert Shearman } 1641c78efa8SRobert Shearman 165c89359a4SRoopa Prabhu return hash; 166c89359a4SRoopa Prabhu } 167c89359a4SRoopa Prabhu 168c89359a4SRoopa Prabhu static struct mpls_nh *mpls_select_multipath(struct mpls_route *rt, 169*9f427a0eSDavid Ahern struct sk_buff *skb) 170c89359a4SRoopa Prabhu { 171c89359a4SRoopa Prabhu int alive = ACCESS_ONCE(rt->rt_nhn_alive); 172c89359a4SRoopa Prabhu u32 hash = 0; 173c89359a4SRoopa Prabhu int nh_index = 0; 174c89359a4SRoopa Prabhu int n = 0; 175c89359a4SRoopa Prabhu 176c89359a4SRoopa Prabhu /* No need to look further into packet if there's only 177c89359a4SRoopa Prabhu * one path 178c89359a4SRoopa Prabhu */ 179c89359a4SRoopa Prabhu if (rt->rt_nhn == 1) 180c89359a4SRoopa Prabhu goto out; 181c89359a4SRoopa Prabhu 182c89359a4SRoopa Prabhu if (alive <= 0) 183c89359a4SRoopa Prabhu return NULL; 184c89359a4SRoopa Prabhu 185*9f427a0eSDavid Ahern hash = mpls_multipath_hash(rt, skb); 186c89359a4SRoopa Prabhu nh_index = hash % alive; 187c89359a4SRoopa Prabhu if (alive == rt->rt_nhn) 188c89359a4SRoopa Prabhu goto out; 189c89359a4SRoopa Prabhu for_nexthops(rt) { 190c89359a4SRoopa Prabhu if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 191c89359a4SRoopa Prabhu continue; 192c89359a4SRoopa Prabhu if (n == nh_index) 193c89359a4SRoopa Prabhu return nh; 194c89359a4SRoopa Prabhu n++; 195c89359a4SRoopa Prabhu } endfor_nexthops(rt); 196c89359a4SRoopa Prabhu 1971c78efa8SRobert Shearman out: 1981c78efa8SRobert Shearman return &rt->rt_nh[nh_index]; 199f8efb73cSRoopa Prabhu } 200f8efb73cSRoopa Prabhu 2010189197fSEric W. Biederman static bool mpls_egress(struct mpls_route *rt, struct sk_buff *skb, 2020189197fSEric W. Biederman struct mpls_entry_decoded dec) 2030189197fSEric W. Biederman { 204118d5234SRobert Shearman enum mpls_payload_type payload_type; 205118d5234SRobert Shearman bool success = false; 2060189197fSEric W. Biederman 20776fecd82SEric W. Biederman /* The IPv4 code below accesses through the IPv4 header 20876fecd82SEric W. Biederman * checksum, which is 12 bytes into the packet. 20976fecd82SEric W. Biederman * The IPv6 code below accesses through the IPv6 hop limit 21076fecd82SEric W. Biederman * which is 8 bytes into the packet. 21176fecd82SEric W. Biederman * 21276fecd82SEric W. Biederman * For all supported cases there should always be at least 12 21376fecd82SEric W. Biederman * bytes of packet data present. The IPv4 header is 20 bytes 21476fecd82SEric W. Biederman * without options and the IPv6 header is always 40 bytes 21576fecd82SEric W. Biederman * long. 21676fecd82SEric W. Biederman */ 21776fecd82SEric W. Biederman if (!pskb_may_pull(skb, 12)) 21876fecd82SEric W. Biederman return false; 21976fecd82SEric W. Biederman 220118d5234SRobert Shearman payload_type = rt->rt_payload_type; 221118d5234SRobert Shearman if (payload_type == MPT_UNSPEC) 222118d5234SRobert Shearman payload_type = ip_hdr(skb)->version; 223118d5234SRobert Shearman 224118d5234SRobert Shearman switch (payload_type) { 225118d5234SRobert Shearman case MPT_IPV4: { 226118d5234SRobert Shearman struct iphdr *hdr4 = ip_hdr(skb); 2270189197fSEric W. Biederman skb->protocol = htons(ETH_P_IP); 2280189197fSEric W. Biederman csum_replace2(&hdr4->check, 2290189197fSEric W. Biederman htons(hdr4->ttl << 8), 2300189197fSEric W. Biederman htons(dec.ttl << 8)); 2310189197fSEric W. Biederman hdr4->ttl = dec.ttl; 232118d5234SRobert Shearman success = true; 233118d5234SRobert Shearman break; 2340189197fSEric W. Biederman } 235118d5234SRobert Shearman case MPT_IPV6: { 2360189197fSEric W. Biederman struct ipv6hdr *hdr6 = ipv6_hdr(skb); 2370189197fSEric W. Biederman skb->protocol = htons(ETH_P_IPV6); 2380189197fSEric W. Biederman hdr6->hop_limit = dec.ttl; 239118d5234SRobert Shearman success = true; 240118d5234SRobert Shearman break; 2410189197fSEric W. Biederman } 242118d5234SRobert Shearman case MPT_UNSPEC: 243118d5234SRobert Shearman break; 244118d5234SRobert Shearman } 245118d5234SRobert Shearman 2460189197fSEric W. Biederman return success; 2470189197fSEric W. Biederman } 2480189197fSEric W. Biederman 2490189197fSEric W. Biederman static int mpls_forward(struct sk_buff *skb, struct net_device *dev, 2500189197fSEric W. Biederman struct packet_type *pt, struct net_device *orig_dev) 2510189197fSEric W. Biederman { 2520189197fSEric W. Biederman struct net *net = dev_net(dev); 2530189197fSEric W. Biederman struct mpls_shim_hdr *hdr; 2540189197fSEric W. Biederman struct mpls_route *rt; 255f8efb73cSRoopa Prabhu struct mpls_nh *nh; 2560189197fSEric W. Biederman struct mpls_entry_decoded dec; 2570189197fSEric W. Biederman struct net_device *out_dev; 25803c57747SRobert Shearman struct mpls_dev *mdev; 2590189197fSEric W. Biederman unsigned int hh_len; 2600189197fSEric W. Biederman unsigned int new_header_size; 2610189197fSEric W. Biederman unsigned int mtu; 2620189197fSEric W. Biederman int err; 2630189197fSEric W. Biederman 2640189197fSEric W. Biederman /* Careful this entire function runs inside of an rcu critical section */ 2650189197fSEric W. Biederman 26603c57747SRobert Shearman mdev = mpls_dev_get(dev); 26737bde799SRobert Shearman if (!mdev || !mdev->input_enabled) 26803c57747SRobert Shearman goto drop; 26903c57747SRobert Shearman 2700189197fSEric W. Biederman if (skb->pkt_type != PACKET_HOST) 2710189197fSEric W. Biederman goto drop; 2720189197fSEric W. Biederman 2730189197fSEric W. Biederman if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) 2740189197fSEric W. Biederman goto drop; 2750189197fSEric W. Biederman 2760189197fSEric W. Biederman if (!pskb_may_pull(skb, sizeof(*hdr))) 2770189197fSEric W. Biederman goto drop; 2780189197fSEric W. Biederman 2790189197fSEric W. Biederman /* Read and decode the label */ 2800189197fSEric W. Biederman hdr = mpls_hdr(skb); 2810189197fSEric W. Biederman dec = mpls_entry_decode(hdr); 2820189197fSEric W. Biederman 2830189197fSEric W. Biederman rt = mpls_route_input_rcu(net, dec.label); 2840189197fSEric W. Biederman if (!rt) 2850189197fSEric W. Biederman goto drop; 2860189197fSEric W. Biederman 287*9f427a0eSDavid Ahern nh = mpls_select_multipath(rt, skb); 288f8efb73cSRoopa Prabhu if (!nh) 289f8efb73cSRoopa Prabhu goto drop; 290f8efb73cSRoopa Prabhu 2910189197fSEric W. Biederman /* Find the output device */ 292f8efb73cSRoopa Prabhu out_dev = rcu_dereference(nh->nh_dev); 2930189197fSEric W. Biederman if (!mpls_output_possible(out_dev)) 2940189197fSEric W. Biederman goto drop; 2950189197fSEric W. Biederman 296*9f427a0eSDavid Ahern /* Pop the label */ 297*9f427a0eSDavid Ahern skb_pull(skb, sizeof(*hdr)); 298*9f427a0eSDavid Ahern skb_reset_network_header(skb); 299*9f427a0eSDavid Ahern 300*9f427a0eSDavid Ahern skb_orphan(skb); 301*9f427a0eSDavid Ahern 3020189197fSEric W. Biederman if (skb_warn_if_lro(skb)) 3030189197fSEric W. Biederman goto drop; 3040189197fSEric W. Biederman 3050189197fSEric W. Biederman skb_forward_csum(skb); 3060189197fSEric W. Biederman 3070189197fSEric W. Biederman /* Verify ttl is valid */ 308aa7da937SEric W. Biederman if (dec.ttl <= 1) 3090189197fSEric W. Biederman goto drop; 3100189197fSEric W. Biederman dec.ttl -= 1; 3110189197fSEric W. Biederman 3120189197fSEric W. Biederman /* Verify the destination can hold the packet */ 313f8efb73cSRoopa Prabhu new_header_size = mpls_nh_header_size(nh); 3140189197fSEric W. Biederman mtu = mpls_dev_mtu(out_dev); 3150189197fSEric W. Biederman if (mpls_pkt_too_big(skb, mtu - new_header_size)) 3160189197fSEric W. Biederman goto drop; 3170189197fSEric W. Biederman 3180189197fSEric W. Biederman hh_len = LL_RESERVED_SPACE(out_dev); 3190189197fSEric W. Biederman if (!out_dev->header_ops) 3200189197fSEric W. Biederman hh_len = 0; 3210189197fSEric W. Biederman 3220189197fSEric W. Biederman /* Ensure there is enough space for the headers in the skb */ 3230189197fSEric W. Biederman if (skb_cow(skb, hh_len + new_header_size)) 3240189197fSEric W. Biederman goto drop; 3250189197fSEric W. Biederman 3260189197fSEric W. Biederman skb->dev = out_dev; 3270189197fSEric W. Biederman skb->protocol = htons(ETH_P_MPLS_UC); 3280189197fSEric W. Biederman 3290189197fSEric W. Biederman if (unlikely(!new_header_size && dec.bos)) { 3300189197fSEric W. Biederman /* Penultimate hop popping */ 3310189197fSEric W. Biederman if (!mpls_egress(rt, skb, dec)) 3320189197fSEric W. Biederman goto drop; 3330189197fSEric W. Biederman } else { 3340189197fSEric W. Biederman bool bos; 3350189197fSEric W. Biederman int i; 3360189197fSEric W. Biederman skb_push(skb, new_header_size); 3370189197fSEric W. Biederman skb_reset_network_header(skb); 3380189197fSEric W. Biederman /* Push the new labels */ 3390189197fSEric W. Biederman hdr = mpls_hdr(skb); 3400189197fSEric W. Biederman bos = dec.bos; 341f8efb73cSRoopa Prabhu for (i = nh->nh_labels - 1; i >= 0; i--) { 342f8efb73cSRoopa Prabhu hdr[i] = mpls_entry_encode(nh->nh_label[i], 343f8efb73cSRoopa Prabhu dec.ttl, 0, bos); 3440189197fSEric W. Biederman bos = false; 3450189197fSEric W. Biederman } 3460189197fSEric W. Biederman } 3470189197fSEric W. Biederman 348eb7809f0SRobert Shearman /* If via wasn't specified then send out using device address */ 349eb7809f0SRobert Shearman if (nh->nh_via_table == MPLS_NEIGH_TABLE_UNSPEC) 350eb7809f0SRobert Shearman err = neigh_xmit(NEIGH_LINK_TABLE, out_dev, 351eb7809f0SRobert Shearman out_dev->dev_addr, skb); 352eb7809f0SRobert Shearman else 353eb7809f0SRobert Shearman err = neigh_xmit(nh->nh_via_table, out_dev, 354eb7809f0SRobert Shearman mpls_nh_via(rt, nh), skb); 3550189197fSEric W. Biederman if (err) 3560189197fSEric W. Biederman net_dbg_ratelimited("%s: packet transmission failed: %d\n", 3570189197fSEric W. Biederman __func__, err); 3580189197fSEric W. Biederman return 0; 3590189197fSEric W. Biederman 3600189197fSEric W. Biederman drop: 3610189197fSEric W. Biederman kfree_skb(skb); 3620189197fSEric W. Biederman return NET_RX_DROP; 3630189197fSEric W. Biederman } 3640189197fSEric W. Biederman 3650189197fSEric W. Biederman static struct packet_type mpls_packet_type __read_mostly = { 3660189197fSEric W. Biederman .type = cpu_to_be16(ETH_P_MPLS_UC), 3670189197fSEric W. Biederman .func = mpls_forward, 3680189197fSEric W. Biederman }; 3690189197fSEric W. Biederman 370f0126539SWu Fengguang static const struct nla_policy rtm_mpls_policy[RTA_MAX+1] = { 37103c05665SEric W. Biederman [RTA_DST] = { .type = NLA_U32 }, 37203c05665SEric W. Biederman [RTA_OIF] = { .type = NLA_U32 }, 37303c05665SEric W. Biederman }; 37403c05665SEric W. Biederman 375a2519929SEric W. Biederman struct mpls_route_config { 376a2519929SEric W. Biederman u32 rc_protocol; 377a2519929SEric W. Biederman u32 rc_ifindex; 378f8efb73cSRoopa Prabhu u8 rc_via_table; 379f8efb73cSRoopa Prabhu u8 rc_via_alen; 380a2519929SEric W. Biederman u8 rc_via[MAX_VIA_ALEN]; 381a2519929SEric W. Biederman u32 rc_label; 382f8efb73cSRoopa Prabhu u8 rc_output_labels; 383a2519929SEric W. Biederman u32 rc_output_label[MAX_NEW_LABELS]; 384a2519929SEric W. Biederman u32 rc_nlflags; 385118d5234SRobert Shearman enum mpls_payload_type rc_payload_type; 386a2519929SEric W. Biederman struct nl_info rc_nlinfo; 387f8efb73cSRoopa Prabhu struct rtnexthop *rc_mp; 388f8efb73cSRoopa Prabhu int rc_mp_len; 389a2519929SEric W. Biederman }; 390a2519929SEric W. Biederman 391cf4b24f0SRobert Shearman static struct mpls_route *mpls_rt_alloc(int num_nh, u8 max_alen) 3920189197fSEric W. Biederman { 393cf4b24f0SRobert Shearman u8 max_alen_aligned = ALIGN(max_alen, VIA_ALEN_ALIGN); 3940189197fSEric W. Biederman struct mpls_route *rt; 3950189197fSEric W. Biederman 396cf4b24f0SRobert Shearman rt = kzalloc(ALIGN(sizeof(*rt) + num_nh * sizeof(*rt->rt_nh), 397cf4b24f0SRobert Shearman VIA_ALEN_ALIGN) + 398cf4b24f0SRobert Shearman num_nh * max_alen_aligned, 399f8efb73cSRoopa Prabhu GFP_KERNEL); 400cf4b24f0SRobert Shearman if (rt) { 401f8efb73cSRoopa Prabhu rt->rt_nhn = num_nh; 402c89359a4SRoopa Prabhu rt->rt_nhn_alive = num_nh; 403cf4b24f0SRobert Shearman rt->rt_max_alen = max_alen_aligned; 404cf4b24f0SRobert Shearman } 405f8efb73cSRoopa Prabhu 4060189197fSEric W. Biederman return rt; 4070189197fSEric W. Biederman } 4080189197fSEric W. Biederman 4090189197fSEric W. Biederman static void mpls_rt_free(struct mpls_route *rt) 4100189197fSEric W. Biederman { 4110189197fSEric W. Biederman if (rt) 4120189197fSEric W. Biederman kfree_rcu(rt, rt_rcu); 4130189197fSEric W. Biederman } 4140189197fSEric W. Biederman 4158de147dcSEric W. Biederman static void mpls_notify_route(struct net *net, unsigned index, 4168de147dcSEric W. Biederman struct mpls_route *old, struct mpls_route *new, 4178de147dcSEric W. Biederman const struct nl_info *info) 4188de147dcSEric W. Biederman { 4198de147dcSEric W. Biederman struct nlmsghdr *nlh = info ? info->nlh : NULL; 4208de147dcSEric W. Biederman unsigned portid = info ? info->portid : 0; 4218de147dcSEric W. Biederman int event = new ? RTM_NEWROUTE : RTM_DELROUTE; 4228de147dcSEric W. Biederman struct mpls_route *rt = new ? new : old; 4238de147dcSEric W. Biederman unsigned nlm_flags = (old && new) ? NLM_F_REPLACE : 0; 4248de147dcSEric W. Biederman /* Ignore reserved labels for now */ 425a6affd24SRobert Shearman if (rt && (index >= MPLS_LABEL_FIRST_UNRESERVED)) 4268de147dcSEric W. Biederman rtmsg_lfib(event, index, rt, nlh, net, portid, nlm_flags); 4278de147dcSEric W. Biederman } 4288de147dcSEric W. Biederman 4290189197fSEric W. Biederman static void mpls_route_update(struct net *net, unsigned index, 430f8efb73cSRoopa Prabhu struct mpls_route *new, 4310189197fSEric W. Biederman const struct nl_info *info) 4320189197fSEric W. Biederman { 43319d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 434f8efb73cSRoopa Prabhu struct mpls_route *rt; 4350189197fSEric W. Biederman 4360189197fSEric W. Biederman ASSERT_RTNL(); 4370189197fSEric W. Biederman 43819d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 43919d0c341SEric W. Biederman rt = rtnl_dereference(platform_label[index]); 44019d0c341SEric W. Biederman rcu_assign_pointer(platform_label[index], new); 4410189197fSEric W. Biederman 442f8efb73cSRoopa Prabhu mpls_notify_route(net, index, rt, new, info); 4438de147dcSEric W. Biederman 4440189197fSEric W. Biederman /* If we removed a route free it now */ 445f8efb73cSRoopa Prabhu mpls_rt_free(rt); 4460189197fSEric W. Biederman } 4470189197fSEric W. Biederman 448a2519929SEric W. Biederman static unsigned find_free_label(struct net *net) 449a2519929SEric W. Biederman { 45019d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 45119d0c341SEric W. Biederman size_t platform_labels; 452a2519929SEric W. Biederman unsigned index; 45319d0c341SEric W. Biederman 45419d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 45519d0c341SEric W. Biederman platform_labels = net->mpls.platform_labels; 456a6affd24SRobert Shearman for (index = MPLS_LABEL_FIRST_UNRESERVED; index < platform_labels; 457a6affd24SRobert Shearman index++) { 45819d0c341SEric W. Biederman if (!rtnl_dereference(platform_label[index])) 459a2519929SEric W. Biederman return index; 460a2519929SEric W. Biederman } 461a2519929SEric W. Biederman return LABEL_NOT_SPECIFIED; 462a2519929SEric W. Biederman } 463a2519929SEric W. Biederman 464bf21563aSRoopa Prabhu #if IS_ENABLED(CONFIG_INET) 465cf4b24f0SRobert Shearman static struct net_device *inet_fib_lookup_dev(struct net *net, 466cf4b24f0SRobert Shearman const void *addr) 46701faef2cSRoopa Prabhu { 4685a9348b5SDan Carpenter struct net_device *dev; 46901faef2cSRoopa Prabhu struct rtable *rt; 47001faef2cSRoopa Prabhu struct in_addr daddr; 47101faef2cSRoopa Prabhu 47201faef2cSRoopa Prabhu memcpy(&daddr, addr, sizeof(struct in_addr)); 47301faef2cSRoopa Prabhu rt = ip_route_output(net, daddr.s_addr, 0, 0, 0); 47401faef2cSRoopa Prabhu if (IS_ERR(rt)) 4755a9348b5SDan Carpenter return ERR_CAST(rt); 47601faef2cSRoopa Prabhu 47701faef2cSRoopa Prabhu dev = rt->dst.dev; 47801faef2cSRoopa Prabhu dev_hold(dev); 47901faef2cSRoopa Prabhu 48001faef2cSRoopa Prabhu ip_rt_put(rt); 48101faef2cSRoopa Prabhu 48201faef2cSRoopa Prabhu return dev; 48301faef2cSRoopa Prabhu } 484bf21563aSRoopa Prabhu #else 485cf4b24f0SRobert Shearman static struct net_device *inet_fib_lookup_dev(struct net *net, 486cf4b24f0SRobert Shearman const void *addr) 487bf21563aSRoopa Prabhu { 488bf21563aSRoopa Prabhu return ERR_PTR(-EAFNOSUPPORT); 489bf21563aSRoopa Prabhu } 490bf21563aSRoopa Prabhu #endif 49101faef2cSRoopa Prabhu 492bf21563aSRoopa Prabhu #if IS_ENABLED(CONFIG_IPV6) 493cf4b24f0SRobert Shearman static struct net_device *inet6_fib_lookup_dev(struct net *net, 494cf4b24f0SRobert Shearman const void *addr) 49501faef2cSRoopa Prabhu { 4965a9348b5SDan Carpenter struct net_device *dev; 49701faef2cSRoopa Prabhu struct dst_entry *dst; 49801faef2cSRoopa Prabhu struct flowi6 fl6; 499bf21563aSRoopa Prabhu int err; 500bf21563aSRoopa Prabhu 501bf21563aSRoopa Prabhu if (!ipv6_stub) 502bf21563aSRoopa Prabhu return ERR_PTR(-EAFNOSUPPORT); 50301faef2cSRoopa Prabhu 50401faef2cSRoopa Prabhu memset(&fl6, 0, sizeof(fl6)); 50501faef2cSRoopa Prabhu memcpy(&fl6.daddr, addr, sizeof(struct in6_addr)); 506bf21563aSRoopa Prabhu err = ipv6_stub->ipv6_dst_lookup(net, NULL, &dst, &fl6); 507bf21563aSRoopa Prabhu if (err) 5085a9348b5SDan Carpenter return ERR_PTR(err); 50901faef2cSRoopa Prabhu 51001faef2cSRoopa Prabhu dev = dst->dev; 51101faef2cSRoopa Prabhu dev_hold(dev); 51201faef2cSRoopa Prabhu dst_release(dst); 51301faef2cSRoopa Prabhu 51401faef2cSRoopa Prabhu return dev; 51501faef2cSRoopa Prabhu } 516bf21563aSRoopa Prabhu #else 517cf4b24f0SRobert Shearman static struct net_device *inet6_fib_lookup_dev(struct net *net, 518cf4b24f0SRobert Shearman const void *addr) 519bf21563aSRoopa Prabhu { 520bf21563aSRoopa Prabhu return ERR_PTR(-EAFNOSUPPORT); 521bf21563aSRoopa Prabhu } 522bf21563aSRoopa Prabhu #endif 52301faef2cSRoopa Prabhu 52401faef2cSRoopa Prabhu static struct net_device *find_outdev(struct net *net, 525cf4b24f0SRobert Shearman struct mpls_route *rt, 526f8efb73cSRoopa Prabhu struct mpls_nh *nh, int oif) 52701faef2cSRoopa Prabhu { 52801faef2cSRoopa Prabhu struct net_device *dev = NULL; 52901faef2cSRoopa Prabhu 530f8efb73cSRoopa Prabhu if (!oif) { 531f8efb73cSRoopa Prabhu switch (nh->nh_via_table) { 53201faef2cSRoopa Prabhu case NEIGH_ARP_TABLE: 533cf4b24f0SRobert Shearman dev = inet_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 53401faef2cSRoopa Prabhu break; 53501faef2cSRoopa Prabhu case NEIGH_ND_TABLE: 536cf4b24f0SRobert Shearman dev = inet6_fib_lookup_dev(net, mpls_nh_via(rt, nh)); 53701faef2cSRoopa Prabhu break; 53801faef2cSRoopa Prabhu case NEIGH_LINK_TABLE: 53901faef2cSRoopa Prabhu break; 54001faef2cSRoopa Prabhu } 54101faef2cSRoopa Prabhu } else { 542f8efb73cSRoopa Prabhu dev = dev_get_by_index(net, oif); 54301faef2cSRoopa Prabhu } 54401faef2cSRoopa Prabhu 5453dcb615eSRoopa Prabhu if (!dev) 5463dcb615eSRoopa Prabhu return ERR_PTR(-ENODEV); 5473dcb615eSRoopa Prabhu 54894a57f1fSRoopa Prabhu if (IS_ERR(dev)) 54994a57f1fSRoopa Prabhu return dev; 55094a57f1fSRoopa Prabhu 551f8efb73cSRoopa Prabhu /* The caller is holding rtnl anyways, so release the dev reference */ 552f8efb73cSRoopa Prabhu dev_put(dev); 553f8efb73cSRoopa Prabhu 55401faef2cSRoopa Prabhu return dev; 55501faef2cSRoopa Prabhu } 55601faef2cSRoopa Prabhu 557cf4b24f0SRobert Shearman static int mpls_nh_assign_dev(struct net *net, struct mpls_route *rt, 558cf4b24f0SRobert Shearman struct mpls_nh *nh, int oif) 559f8efb73cSRoopa Prabhu { 560f8efb73cSRoopa Prabhu struct net_device *dev = NULL; 561f8efb73cSRoopa Prabhu int err = -ENODEV; 562f8efb73cSRoopa Prabhu 563cf4b24f0SRobert Shearman dev = find_outdev(net, rt, nh, oif); 564f8efb73cSRoopa Prabhu if (IS_ERR(dev)) { 565f8efb73cSRoopa Prabhu err = PTR_ERR(dev); 566f8efb73cSRoopa Prabhu dev = NULL; 567f8efb73cSRoopa Prabhu goto errout; 568f8efb73cSRoopa Prabhu } 569f8efb73cSRoopa Prabhu 570f8efb73cSRoopa Prabhu /* Ensure this is a supported device */ 571f8efb73cSRoopa Prabhu err = -EINVAL; 572f8efb73cSRoopa Prabhu if (!mpls_dev_get(dev)) 573f8efb73cSRoopa Prabhu goto errout; 574f8efb73cSRoopa Prabhu 575a3e948e8SRobert Shearman if ((nh->nh_via_table == NEIGH_LINK_TABLE) && 576a3e948e8SRobert Shearman (dev->addr_len != nh->nh_via_alen)) 577a3e948e8SRobert Shearman goto errout; 578a3e948e8SRobert Shearman 579f8efb73cSRoopa Prabhu RCU_INIT_POINTER(nh->nh_dev, dev); 580f8efb73cSRoopa Prabhu 581c89359a4SRoopa Prabhu if (!(dev->flags & IFF_UP)) { 582c89359a4SRoopa Prabhu nh->nh_flags |= RTNH_F_DEAD; 583c89359a4SRoopa Prabhu } else { 584c89359a4SRoopa Prabhu unsigned int flags; 585c89359a4SRoopa Prabhu 586c89359a4SRoopa Prabhu flags = dev_get_flags(dev); 587c89359a4SRoopa Prabhu if (!(flags & (IFF_RUNNING | IFF_LOWER_UP))) 588c89359a4SRoopa Prabhu nh->nh_flags |= RTNH_F_LINKDOWN; 589c89359a4SRoopa Prabhu } 590c89359a4SRoopa Prabhu 591f8efb73cSRoopa Prabhu return 0; 592f8efb73cSRoopa Prabhu 593f8efb73cSRoopa Prabhu errout: 594f8efb73cSRoopa Prabhu return err; 595f8efb73cSRoopa Prabhu } 596f8efb73cSRoopa Prabhu 597f8efb73cSRoopa Prabhu static int mpls_nh_build_from_cfg(struct mpls_route_config *cfg, 598f8efb73cSRoopa Prabhu struct mpls_route *rt) 599f8efb73cSRoopa Prabhu { 600f8efb73cSRoopa Prabhu struct net *net = cfg->rc_nlinfo.nl_net; 601f8efb73cSRoopa Prabhu struct mpls_nh *nh = rt->rt_nh; 602f8efb73cSRoopa Prabhu int err; 603f8efb73cSRoopa Prabhu int i; 604f8efb73cSRoopa Prabhu 605f8efb73cSRoopa Prabhu if (!nh) 606f8efb73cSRoopa Prabhu return -ENOMEM; 607f8efb73cSRoopa Prabhu 608f8efb73cSRoopa Prabhu err = -EINVAL; 609f8efb73cSRoopa Prabhu /* Ensure only a supported number of labels are present */ 610f8efb73cSRoopa Prabhu if (cfg->rc_output_labels > MAX_NEW_LABELS) 611f8efb73cSRoopa Prabhu goto errout; 612f8efb73cSRoopa Prabhu 613f8efb73cSRoopa Prabhu nh->nh_labels = cfg->rc_output_labels; 614f8efb73cSRoopa Prabhu for (i = 0; i < nh->nh_labels; i++) 615f8efb73cSRoopa Prabhu nh->nh_label[i] = cfg->rc_output_label[i]; 616f8efb73cSRoopa Prabhu 617f8efb73cSRoopa Prabhu nh->nh_via_table = cfg->rc_via_table; 618cf4b24f0SRobert Shearman memcpy(__mpls_nh_via(rt, nh), cfg->rc_via, cfg->rc_via_alen); 619f8efb73cSRoopa Prabhu nh->nh_via_alen = cfg->rc_via_alen; 620f8efb73cSRoopa Prabhu 621cf4b24f0SRobert Shearman err = mpls_nh_assign_dev(net, rt, nh, cfg->rc_ifindex); 622f8efb73cSRoopa Prabhu if (err) 623f8efb73cSRoopa Prabhu goto errout; 624f8efb73cSRoopa Prabhu 625c89359a4SRoopa Prabhu if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 626c89359a4SRoopa Prabhu rt->rt_nhn_alive--; 627c89359a4SRoopa Prabhu 628f8efb73cSRoopa Prabhu return 0; 629f8efb73cSRoopa Prabhu 630f8efb73cSRoopa Prabhu errout: 631f8efb73cSRoopa Prabhu return err; 632f8efb73cSRoopa Prabhu } 633f8efb73cSRoopa Prabhu 634cf4b24f0SRobert Shearman static int mpls_nh_build(struct net *net, struct mpls_route *rt, 635c89359a4SRoopa Prabhu struct mpls_nh *nh, int oif, struct nlattr *via, 636c89359a4SRoopa Prabhu struct nlattr *newdst) 637f8efb73cSRoopa Prabhu { 638f8efb73cSRoopa Prabhu int err = -ENOMEM; 639f8efb73cSRoopa Prabhu 640f8efb73cSRoopa Prabhu if (!nh) 641f8efb73cSRoopa Prabhu goto errout; 642f8efb73cSRoopa Prabhu 643f8efb73cSRoopa Prabhu if (newdst) { 644f8efb73cSRoopa Prabhu err = nla_get_labels(newdst, MAX_NEW_LABELS, 645f8efb73cSRoopa Prabhu &nh->nh_labels, nh->nh_label); 646f8efb73cSRoopa Prabhu if (err) 647f8efb73cSRoopa Prabhu goto errout; 648f8efb73cSRoopa Prabhu } 649f8efb73cSRoopa Prabhu 650f20367dfSRobert Shearman if (via) { 651f8efb73cSRoopa Prabhu err = nla_get_via(via, &nh->nh_via_alen, &nh->nh_via_table, 652cf4b24f0SRobert Shearman __mpls_nh_via(rt, nh)); 653f8efb73cSRoopa Prabhu if (err) 654f8efb73cSRoopa Prabhu goto errout; 655f20367dfSRobert Shearman } else { 656f20367dfSRobert Shearman nh->nh_via_table = MPLS_NEIGH_TABLE_UNSPEC; 657f20367dfSRobert Shearman } 658f8efb73cSRoopa Prabhu 659cf4b24f0SRobert Shearman err = mpls_nh_assign_dev(net, rt, nh, oif); 660f8efb73cSRoopa Prabhu if (err) 661f8efb73cSRoopa Prabhu goto errout; 662f8efb73cSRoopa Prabhu 663f8efb73cSRoopa Prabhu return 0; 664f8efb73cSRoopa Prabhu 665f8efb73cSRoopa Prabhu errout: 666f8efb73cSRoopa Prabhu return err; 667f8efb73cSRoopa Prabhu } 668f8efb73cSRoopa Prabhu 669cf4b24f0SRobert Shearman static int mpls_count_nexthops(struct rtnexthop *rtnh, int len, 670cf4b24f0SRobert Shearman u8 cfg_via_alen, u8 *max_via_alen) 671f8efb73cSRoopa Prabhu { 672f8efb73cSRoopa Prabhu int nhs = 0; 673f8efb73cSRoopa Prabhu int remaining = len; 674f8efb73cSRoopa Prabhu 675cf4b24f0SRobert Shearman if (!rtnh) { 676cf4b24f0SRobert Shearman *max_via_alen = cfg_via_alen; 677cf4b24f0SRobert Shearman return 1; 678cf4b24f0SRobert Shearman } 679cf4b24f0SRobert Shearman 680cf4b24f0SRobert Shearman *max_via_alen = 0; 681cf4b24f0SRobert Shearman 682f8efb73cSRoopa Prabhu while (rtnh_ok(rtnh, remaining)) { 683cf4b24f0SRobert Shearman struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 684cf4b24f0SRobert Shearman int attrlen; 685cf4b24f0SRobert Shearman 686cf4b24f0SRobert Shearman attrlen = rtnh_attrlen(rtnh); 687cf4b24f0SRobert Shearman nla = nla_find(attrs, attrlen, RTA_VIA); 688cf4b24f0SRobert Shearman if (nla && nla_len(nla) >= 689cf4b24f0SRobert Shearman offsetof(struct rtvia, rtvia_addr)) { 690cf4b24f0SRobert Shearman int via_alen = nla_len(nla) - 691cf4b24f0SRobert Shearman offsetof(struct rtvia, rtvia_addr); 692cf4b24f0SRobert Shearman 693cf4b24f0SRobert Shearman if (via_alen <= MAX_VIA_ALEN) 694cf4b24f0SRobert Shearman *max_via_alen = max_t(u16, *max_via_alen, 695cf4b24f0SRobert Shearman via_alen); 696cf4b24f0SRobert Shearman } 697cf4b24f0SRobert Shearman 698f8efb73cSRoopa Prabhu nhs++; 699f8efb73cSRoopa Prabhu rtnh = rtnh_next(rtnh, &remaining); 700f8efb73cSRoopa Prabhu } 701f8efb73cSRoopa Prabhu 702f8efb73cSRoopa Prabhu /* leftover implies invalid nexthop configuration, discard it */ 703f8efb73cSRoopa Prabhu return remaining > 0 ? 0 : nhs; 704f8efb73cSRoopa Prabhu } 705f8efb73cSRoopa Prabhu 706f8efb73cSRoopa Prabhu static int mpls_nh_build_multi(struct mpls_route_config *cfg, 707f8efb73cSRoopa Prabhu struct mpls_route *rt) 708f8efb73cSRoopa Prabhu { 709f8efb73cSRoopa Prabhu struct rtnexthop *rtnh = cfg->rc_mp; 710f8efb73cSRoopa Prabhu struct nlattr *nla_via, *nla_newdst; 711f8efb73cSRoopa Prabhu int remaining = cfg->rc_mp_len; 712f8efb73cSRoopa Prabhu int nhs = 0; 713f8efb73cSRoopa Prabhu int err = 0; 714f8efb73cSRoopa Prabhu 715f8efb73cSRoopa Prabhu change_nexthops(rt) { 716f8efb73cSRoopa Prabhu int attrlen; 717f8efb73cSRoopa Prabhu 718f8efb73cSRoopa Prabhu nla_via = NULL; 719f8efb73cSRoopa Prabhu nla_newdst = NULL; 720f8efb73cSRoopa Prabhu 721f8efb73cSRoopa Prabhu err = -EINVAL; 722f8efb73cSRoopa Prabhu if (!rtnh_ok(rtnh, remaining)) 723f8efb73cSRoopa Prabhu goto errout; 724f8efb73cSRoopa Prabhu 7251c78efa8SRobert Shearman /* neither weighted multipath nor any flags 7261c78efa8SRobert Shearman * are supported 7271c78efa8SRobert Shearman */ 7281c78efa8SRobert Shearman if (rtnh->rtnh_hops || rtnh->rtnh_flags) 7291c78efa8SRobert Shearman goto errout; 7301c78efa8SRobert Shearman 731f8efb73cSRoopa Prabhu attrlen = rtnh_attrlen(rtnh); 732f8efb73cSRoopa Prabhu if (attrlen > 0) { 733f8efb73cSRoopa Prabhu struct nlattr *attrs = rtnh_attrs(rtnh); 734f8efb73cSRoopa Prabhu 735f8efb73cSRoopa Prabhu nla_via = nla_find(attrs, attrlen, RTA_VIA); 736f8efb73cSRoopa Prabhu nla_newdst = nla_find(attrs, attrlen, RTA_NEWDST); 737f8efb73cSRoopa Prabhu } 738f8efb73cSRoopa Prabhu 739cf4b24f0SRobert Shearman err = mpls_nh_build(cfg->rc_nlinfo.nl_net, rt, nh, 740c89359a4SRoopa Prabhu rtnh->rtnh_ifindex, nla_via, nla_newdst); 741f8efb73cSRoopa Prabhu if (err) 742f8efb73cSRoopa Prabhu goto errout; 743f8efb73cSRoopa Prabhu 744c89359a4SRoopa Prabhu if (nh->nh_flags & (RTNH_F_DEAD | RTNH_F_LINKDOWN)) 745c89359a4SRoopa Prabhu rt->rt_nhn_alive--; 746c89359a4SRoopa Prabhu 747f8efb73cSRoopa Prabhu rtnh = rtnh_next(rtnh, &remaining); 748f8efb73cSRoopa Prabhu nhs++; 749f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 750f8efb73cSRoopa Prabhu 751f8efb73cSRoopa Prabhu rt->rt_nhn = nhs; 752f8efb73cSRoopa Prabhu 753f8efb73cSRoopa Prabhu return 0; 754f8efb73cSRoopa Prabhu 755f8efb73cSRoopa Prabhu errout: 756f8efb73cSRoopa Prabhu return err; 757f8efb73cSRoopa Prabhu } 758f8efb73cSRoopa Prabhu 759a2519929SEric W. Biederman static int mpls_route_add(struct mpls_route_config *cfg) 760a2519929SEric W. Biederman { 76119d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 762a2519929SEric W. Biederman struct net *net = cfg->rc_nlinfo.nl_net; 763a2519929SEric W. Biederman struct mpls_route *rt, *old; 764a2519929SEric W. Biederman int err = -EINVAL; 765cf4b24f0SRobert Shearman u8 max_via_alen; 766f8efb73cSRoopa Prabhu unsigned index; 767cf4b24f0SRobert Shearman int nhs; 768a2519929SEric W. Biederman 769a2519929SEric W. Biederman index = cfg->rc_label; 770a2519929SEric W. Biederman 771a2519929SEric W. Biederman /* If a label was not specified during insert pick one */ 772a2519929SEric W. Biederman if ((index == LABEL_NOT_SPECIFIED) && 773a2519929SEric W. Biederman (cfg->rc_nlflags & NLM_F_CREATE)) { 774a2519929SEric W. Biederman index = find_free_label(net); 775a2519929SEric W. Biederman } 776a2519929SEric W. Biederman 777a6affd24SRobert Shearman /* Reserved labels may not be set */ 778a6affd24SRobert Shearman if (index < MPLS_LABEL_FIRST_UNRESERVED) 779a2519929SEric W. Biederman goto errout; 780a2519929SEric W. Biederman 781a2519929SEric W. Biederman /* The full 20 bit range may not be supported. */ 782a2519929SEric W. Biederman if (index >= net->mpls.platform_labels) 783a2519929SEric W. Biederman goto errout; 784a2519929SEric W. Biederman 785a2519929SEric W. Biederman /* Append makes no sense with mpls */ 7860f7bbd58SEric W. Biederman err = -EOPNOTSUPP; 787a2519929SEric W. Biederman if (cfg->rc_nlflags & NLM_F_APPEND) 788a2519929SEric W. Biederman goto errout; 789a2519929SEric W. Biederman 790a2519929SEric W. Biederman err = -EEXIST; 79119d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 79219d0c341SEric W. Biederman old = rtnl_dereference(platform_label[index]); 793a2519929SEric W. Biederman if ((cfg->rc_nlflags & NLM_F_EXCL) && old) 794a2519929SEric W. Biederman goto errout; 795a2519929SEric W. Biederman 796a2519929SEric W. Biederman err = -EEXIST; 797a2519929SEric W. Biederman if (!(cfg->rc_nlflags & NLM_F_REPLACE) && old) 798a2519929SEric W. Biederman goto errout; 799a2519929SEric W. Biederman 800a2519929SEric W. Biederman err = -ENOENT; 801a2519929SEric W. Biederman if (!(cfg->rc_nlflags & NLM_F_CREATE) && !old) 802a2519929SEric W. Biederman goto errout; 803a2519929SEric W. Biederman 804f8efb73cSRoopa Prabhu err = -EINVAL; 805cf4b24f0SRobert Shearman nhs = mpls_count_nexthops(cfg->rc_mp, cfg->rc_mp_len, 806cf4b24f0SRobert Shearman cfg->rc_via_alen, &max_via_alen); 807f8efb73cSRoopa Prabhu if (nhs == 0) 808f8efb73cSRoopa Prabhu goto errout; 809f8efb73cSRoopa Prabhu 810a2519929SEric W. Biederman err = -ENOMEM; 811cf4b24f0SRobert Shearman rt = mpls_rt_alloc(nhs, max_via_alen); 812a2519929SEric W. Biederman if (!rt) 813a2519929SEric W. Biederman goto errout; 814a2519929SEric W. Biederman 815a2519929SEric W. Biederman rt->rt_protocol = cfg->rc_protocol; 816118d5234SRobert Shearman rt->rt_payload_type = cfg->rc_payload_type; 817a2519929SEric W. Biederman 818f8efb73cSRoopa Prabhu if (cfg->rc_mp) 819f8efb73cSRoopa Prabhu err = mpls_nh_build_multi(cfg, rt); 820f8efb73cSRoopa Prabhu else 821f8efb73cSRoopa Prabhu err = mpls_nh_build_from_cfg(cfg, rt); 822f8efb73cSRoopa Prabhu if (err) 823f8efb73cSRoopa Prabhu goto freert; 824a2519929SEric W. Biederman 825f8efb73cSRoopa Prabhu mpls_route_update(net, index, rt, &cfg->rc_nlinfo); 826f8efb73cSRoopa Prabhu 827a2519929SEric W. Biederman return 0; 828a2519929SEric W. Biederman 829f8efb73cSRoopa Prabhu freert: 830f8efb73cSRoopa Prabhu mpls_rt_free(rt); 831a2519929SEric W. Biederman errout: 832a2519929SEric W. Biederman return err; 833a2519929SEric W. Biederman } 834a2519929SEric W. Biederman 835a2519929SEric W. Biederman static int mpls_route_del(struct mpls_route_config *cfg) 836a2519929SEric W. Biederman { 837a2519929SEric W. Biederman struct net *net = cfg->rc_nlinfo.nl_net; 838a2519929SEric W. Biederman unsigned index; 839a2519929SEric W. Biederman int err = -EINVAL; 840a2519929SEric W. Biederman 841a2519929SEric W. Biederman index = cfg->rc_label; 842a2519929SEric W. Biederman 843a6affd24SRobert Shearman /* Reserved labels may not be removed */ 844a6affd24SRobert Shearman if (index < MPLS_LABEL_FIRST_UNRESERVED) 845a2519929SEric W. Biederman goto errout; 846a2519929SEric W. Biederman 847a2519929SEric W. Biederman /* The full 20 bit range may not be supported */ 848a2519929SEric W. Biederman if (index >= net->mpls.platform_labels) 849a2519929SEric W. Biederman goto errout; 850a2519929SEric W. Biederman 851f8efb73cSRoopa Prabhu mpls_route_update(net, index, NULL, &cfg->rc_nlinfo); 852a2519929SEric W. Biederman 853a2519929SEric W. Biederman err = 0; 854a2519929SEric W. Biederman errout: 855a2519929SEric W. Biederman return err; 856a2519929SEric W. Biederman } 857a2519929SEric W. Biederman 85837bde799SRobert Shearman #define MPLS_PERDEV_SYSCTL_OFFSET(field) \ 85937bde799SRobert Shearman (&((struct mpls_dev *)0)->field) 86037bde799SRobert Shearman 86137bde799SRobert Shearman static const struct ctl_table mpls_dev_table[] = { 86237bde799SRobert Shearman { 86337bde799SRobert Shearman .procname = "input", 86437bde799SRobert Shearman .maxlen = sizeof(int), 86537bde799SRobert Shearman .mode = 0644, 86637bde799SRobert Shearman .proc_handler = proc_dointvec, 86737bde799SRobert Shearman .data = MPLS_PERDEV_SYSCTL_OFFSET(input_enabled), 86837bde799SRobert Shearman }, 86937bde799SRobert Shearman { } 87037bde799SRobert Shearman }; 87137bde799SRobert Shearman 87237bde799SRobert Shearman static int mpls_dev_sysctl_register(struct net_device *dev, 87337bde799SRobert Shearman struct mpls_dev *mdev) 87437bde799SRobert Shearman { 87537bde799SRobert Shearman char path[sizeof("net/mpls/conf/") + IFNAMSIZ]; 87637bde799SRobert Shearman struct ctl_table *table; 87737bde799SRobert Shearman int i; 87837bde799SRobert Shearman 87937bde799SRobert Shearman table = kmemdup(&mpls_dev_table, sizeof(mpls_dev_table), GFP_KERNEL); 88037bde799SRobert Shearman if (!table) 88137bde799SRobert Shearman goto out; 88237bde799SRobert Shearman 88337bde799SRobert Shearman /* Table data contains only offsets relative to the base of 88437bde799SRobert Shearman * the mdev at this point, so make them absolute. 88537bde799SRobert Shearman */ 88637bde799SRobert Shearman for (i = 0; i < ARRAY_SIZE(mpls_dev_table); i++) 88737bde799SRobert Shearman table[i].data = (char *)mdev + (uintptr_t)table[i].data; 88837bde799SRobert Shearman 88937bde799SRobert Shearman snprintf(path, sizeof(path), "net/mpls/conf/%s", dev->name); 89037bde799SRobert Shearman 89137bde799SRobert Shearman mdev->sysctl = register_net_sysctl(dev_net(dev), path, table); 89237bde799SRobert Shearman if (!mdev->sysctl) 89337bde799SRobert Shearman goto free; 89437bde799SRobert Shearman 89537bde799SRobert Shearman return 0; 89637bde799SRobert Shearman 89737bde799SRobert Shearman free: 89837bde799SRobert Shearman kfree(table); 89937bde799SRobert Shearman out: 90037bde799SRobert Shearman return -ENOBUFS; 90137bde799SRobert Shearman } 90237bde799SRobert Shearman 90337bde799SRobert Shearman static void mpls_dev_sysctl_unregister(struct mpls_dev *mdev) 90437bde799SRobert Shearman { 90537bde799SRobert Shearman struct ctl_table *table; 90637bde799SRobert Shearman 90737bde799SRobert Shearman table = mdev->sysctl->ctl_table_arg; 90837bde799SRobert Shearman unregister_net_sysctl_table(mdev->sysctl); 90937bde799SRobert Shearman kfree(table); 91037bde799SRobert Shearman } 91137bde799SRobert Shearman 91203c57747SRobert Shearman static struct mpls_dev *mpls_add_dev(struct net_device *dev) 91303c57747SRobert Shearman { 91403c57747SRobert Shearman struct mpls_dev *mdev; 91503c57747SRobert Shearman int err = -ENOMEM; 91603c57747SRobert Shearman 91703c57747SRobert Shearman ASSERT_RTNL(); 91803c57747SRobert Shearman 91903c57747SRobert Shearman mdev = kzalloc(sizeof(*mdev), GFP_KERNEL); 92003c57747SRobert Shearman if (!mdev) 92103c57747SRobert Shearman return ERR_PTR(err); 92203c57747SRobert Shearman 92337bde799SRobert Shearman err = mpls_dev_sysctl_register(dev, mdev); 92437bde799SRobert Shearman if (err) 92537bde799SRobert Shearman goto free; 92637bde799SRobert Shearman 92703c57747SRobert Shearman rcu_assign_pointer(dev->mpls_ptr, mdev); 92803c57747SRobert Shearman 92903c57747SRobert Shearman return mdev; 93037bde799SRobert Shearman 93137bde799SRobert Shearman free: 93237bde799SRobert Shearman kfree(mdev); 93337bde799SRobert Shearman return ERR_PTR(err); 93403c57747SRobert Shearman } 93503c57747SRobert Shearman 936c89359a4SRoopa Prabhu static void mpls_ifdown(struct net_device *dev, int event) 9370189197fSEric W. Biederman { 93819d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 9390189197fSEric W. Biederman struct net *net = dev_net(dev); 9400189197fSEric W. Biederman unsigned index; 9410189197fSEric W. Biederman 94219d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 9430189197fSEric W. Biederman for (index = 0; index < net->mpls.platform_labels; index++) { 94419d0c341SEric W. Biederman struct mpls_route *rt = rtnl_dereference(platform_label[index]); 945c89359a4SRoopa Prabhu 9460189197fSEric W. Biederman if (!rt) 9470189197fSEric W. Biederman continue; 948c89359a4SRoopa Prabhu 949c89359a4SRoopa Prabhu change_nexthops(rt) { 950f8efb73cSRoopa Prabhu if (rtnl_dereference(nh->nh_dev) != dev) 9510189197fSEric W. Biederman continue; 952c89359a4SRoopa Prabhu switch (event) { 953c89359a4SRoopa Prabhu case NETDEV_DOWN: 954c89359a4SRoopa Prabhu case NETDEV_UNREGISTER: 955c89359a4SRoopa Prabhu nh->nh_flags |= RTNH_F_DEAD; 956c89359a4SRoopa Prabhu /* fall through */ 957c89359a4SRoopa Prabhu case NETDEV_CHANGE: 958c89359a4SRoopa Prabhu nh->nh_flags |= RTNH_F_LINKDOWN; 959c89359a4SRoopa Prabhu ACCESS_ONCE(rt->rt_nhn_alive) = rt->rt_nhn_alive - 1; 960c89359a4SRoopa Prabhu break; 961c89359a4SRoopa Prabhu } 962c89359a4SRoopa Prabhu if (event == NETDEV_UNREGISTER) 963c89359a4SRoopa Prabhu RCU_INIT_POINTER(nh->nh_dev, NULL); 964f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 9650189197fSEric W. Biederman } 966c89359a4SRoopa Prabhu } 96703c57747SRobert Shearman 968c89359a4SRoopa Prabhu static void mpls_ifup(struct net_device *dev, unsigned int nh_flags) 969c89359a4SRoopa Prabhu { 970c89359a4SRoopa Prabhu struct mpls_route __rcu **platform_label; 971c89359a4SRoopa Prabhu struct net *net = dev_net(dev); 972c89359a4SRoopa Prabhu unsigned index; 973c89359a4SRoopa Prabhu int alive; 97437bde799SRobert Shearman 975c89359a4SRoopa Prabhu platform_label = rtnl_dereference(net->mpls.platform_label); 976c89359a4SRoopa Prabhu for (index = 0; index < net->mpls.platform_labels; index++) { 977c89359a4SRoopa Prabhu struct mpls_route *rt = rtnl_dereference(platform_label[index]); 97803c57747SRobert Shearman 979c89359a4SRoopa Prabhu if (!rt) 980c89359a4SRoopa Prabhu continue; 981c89359a4SRoopa Prabhu 982c89359a4SRoopa Prabhu alive = 0; 983c89359a4SRoopa Prabhu change_nexthops(rt) { 984c89359a4SRoopa Prabhu struct net_device *nh_dev = 985c89359a4SRoopa Prabhu rtnl_dereference(nh->nh_dev); 986c89359a4SRoopa Prabhu 987c89359a4SRoopa Prabhu if (!(nh->nh_flags & nh_flags)) { 988c89359a4SRoopa Prabhu alive++; 989c89359a4SRoopa Prabhu continue; 990c89359a4SRoopa Prabhu } 991c89359a4SRoopa Prabhu if (nh_dev != dev) 992c89359a4SRoopa Prabhu continue; 993c89359a4SRoopa Prabhu alive++; 994c89359a4SRoopa Prabhu nh->nh_flags &= ~nh_flags; 995c89359a4SRoopa Prabhu } endfor_nexthops(rt); 996c89359a4SRoopa Prabhu 997c89359a4SRoopa Prabhu ACCESS_ONCE(rt->rt_nhn_alive) = alive; 998c89359a4SRoopa Prabhu } 9990189197fSEric W. Biederman } 10000189197fSEric W. Biederman 10010189197fSEric W. Biederman static int mpls_dev_notify(struct notifier_block *this, unsigned long event, 10020189197fSEric W. Biederman void *ptr) 10030189197fSEric W. Biederman { 10040189197fSEric W. Biederman struct net_device *dev = netdev_notifier_info_to_dev(ptr); 100503c57747SRobert Shearman struct mpls_dev *mdev; 1006c89359a4SRoopa Prabhu unsigned int flags; 10070189197fSEric W. Biederman 1008c89359a4SRoopa Prabhu if (event == NETDEV_REGISTER) { 1009407f31beSSimon Horman /* For now just support Ethernet, IPGRE, SIT and IPIP devices */ 10100d227a86SSimon Horman if (dev->type == ARPHRD_ETHER || 10110d227a86SSimon Horman dev->type == ARPHRD_LOOPBACK || 1012407f31beSSimon Horman dev->type == ARPHRD_IPGRE || 1013407f31beSSimon Horman dev->type == ARPHRD_SIT || 1014407f31beSSimon Horman dev->type == ARPHRD_TUNNEL) { 101503c57747SRobert Shearman mdev = mpls_add_dev(dev); 101603c57747SRobert Shearman if (IS_ERR(mdev)) 101703c57747SRobert Shearman return notifier_from_errno(PTR_ERR(mdev)); 101803c57747SRobert Shearman } 1019c89359a4SRoopa Prabhu return NOTIFY_OK; 1020c89359a4SRoopa Prabhu } 102103c57747SRobert Shearman 1022c89359a4SRoopa Prabhu mdev = mpls_dev_get(dev); 1023c89359a4SRoopa Prabhu if (!mdev) 1024c89359a4SRoopa Prabhu return NOTIFY_OK; 1025c89359a4SRoopa Prabhu 1026c89359a4SRoopa Prabhu switch (event) { 1027c89359a4SRoopa Prabhu case NETDEV_DOWN: 1028c89359a4SRoopa Prabhu mpls_ifdown(dev, event); 1029c89359a4SRoopa Prabhu break; 1030c89359a4SRoopa Prabhu case NETDEV_UP: 1031c89359a4SRoopa Prabhu flags = dev_get_flags(dev); 1032c89359a4SRoopa Prabhu if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1033c89359a4SRoopa Prabhu mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1034c89359a4SRoopa Prabhu else 1035c89359a4SRoopa Prabhu mpls_ifup(dev, RTNH_F_DEAD); 1036c89359a4SRoopa Prabhu break; 1037c89359a4SRoopa Prabhu case NETDEV_CHANGE: 1038c89359a4SRoopa Prabhu flags = dev_get_flags(dev); 1039c89359a4SRoopa Prabhu if (flags & (IFF_RUNNING | IFF_LOWER_UP)) 1040c89359a4SRoopa Prabhu mpls_ifup(dev, RTNH_F_DEAD | RTNH_F_LINKDOWN); 1041c89359a4SRoopa Prabhu else 1042c89359a4SRoopa Prabhu mpls_ifdown(dev, event); 1043c89359a4SRoopa Prabhu break; 10440189197fSEric W. Biederman case NETDEV_UNREGISTER: 1045c89359a4SRoopa Prabhu mpls_ifdown(dev, event); 1046c89359a4SRoopa Prabhu mdev = mpls_dev_get(dev); 1047c89359a4SRoopa Prabhu if (mdev) { 1048c89359a4SRoopa Prabhu mpls_dev_sysctl_unregister(mdev); 1049c89359a4SRoopa Prabhu RCU_INIT_POINTER(dev->mpls_ptr, NULL); 1050c89359a4SRoopa Prabhu kfree_rcu(mdev, rcu); 1051c89359a4SRoopa Prabhu } 10520189197fSEric W. Biederman break; 10530fae3bf0SRobert Shearman case NETDEV_CHANGENAME: 10540fae3bf0SRobert Shearman mdev = mpls_dev_get(dev); 10550fae3bf0SRobert Shearman if (mdev) { 10560fae3bf0SRobert Shearman int err; 10570fae3bf0SRobert Shearman 10580fae3bf0SRobert Shearman mpls_dev_sysctl_unregister(mdev); 10590fae3bf0SRobert Shearman err = mpls_dev_sysctl_register(dev, mdev); 10600fae3bf0SRobert Shearman if (err) 10610fae3bf0SRobert Shearman return notifier_from_errno(err); 10620fae3bf0SRobert Shearman } 10630fae3bf0SRobert Shearman break; 10640189197fSEric W. Biederman } 10650189197fSEric W. Biederman return NOTIFY_OK; 10660189197fSEric W. Biederman } 10670189197fSEric W. Biederman 10680189197fSEric W. Biederman static struct notifier_block mpls_dev_notifier = { 10690189197fSEric W. Biederman .notifier_call = mpls_dev_notify, 10700189197fSEric W. Biederman }; 10710189197fSEric W. Biederman 107203c05665SEric W. Biederman static int nla_put_via(struct sk_buff *skb, 1073b79bda3dSEric W. Biederman u8 table, const void *addr, int alen) 107403c05665SEric W. Biederman { 1075b79bda3dSEric W. Biederman static const int table_to_family[NEIGH_NR_TABLES + 1] = { 1076b79bda3dSEric W. Biederman AF_INET, AF_INET6, AF_DECnet, AF_PACKET, 1077b79bda3dSEric W. Biederman }; 107803c05665SEric W. Biederman struct nlattr *nla; 107903c05665SEric W. Biederman struct rtvia *via; 1080b79bda3dSEric W. Biederman int family = AF_UNSPEC; 108103c05665SEric W. Biederman 108203c05665SEric W. Biederman nla = nla_reserve(skb, RTA_VIA, alen + 2); 108303c05665SEric W. Biederman if (!nla) 108403c05665SEric W. Biederman return -EMSGSIZE; 108503c05665SEric W. Biederman 1086b79bda3dSEric W. Biederman if (table <= NEIGH_NR_TABLES) 1087b79bda3dSEric W. Biederman family = table_to_family[table]; 1088b79bda3dSEric W. Biederman 108903c05665SEric W. Biederman via = nla_data(nla); 109003c05665SEric W. Biederman via->rtvia_family = family; 109103c05665SEric W. Biederman memcpy(via->rtvia_addr, addr, alen); 109203c05665SEric W. Biederman return 0; 109303c05665SEric W. Biederman } 109403c05665SEric W. Biederman 1095966bae33SEric W. Biederman int nla_put_labels(struct sk_buff *skb, int attrtype, 1096966bae33SEric W. Biederman u8 labels, const u32 label[]) 1097966bae33SEric W. Biederman { 1098966bae33SEric W. Biederman struct nlattr *nla; 1099966bae33SEric W. Biederman struct mpls_shim_hdr *nla_label; 1100966bae33SEric W. Biederman bool bos; 1101966bae33SEric W. Biederman int i; 1102966bae33SEric W. Biederman nla = nla_reserve(skb, attrtype, labels*4); 1103966bae33SEric W. Biederman if (!nla) 1104966bae33SEric W. Biederman return -EMSGSIZE; 1105966bae33SEric W. Biederman 1106966bae33SEric W. Biederman nla_label = nla_data(nla); 1107966bae33SEric W. Biederman bos = true; 1108966bae33SEric W. Biederman for (i = labels - 1; i >= 0; i--) { 1109966bae33SEric W. Biederman nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); 1110966bae33SEric W. Biederman bos = false; 1111966bae33SEric W. Biederman } 1112966bae33SEric W. Biederman 1113966bae33SEric W. Biederman return 0; 1114966bae33SEric W. Biederman } 1115face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(nla_put_labels); 1116966bae33SEric W. Biederman 1117966bae33SEric W. Biederman int nla_get_labels(const struct nlattr *nla, 1118f8efb73cSRoopa Prabhu u32 max_labels, u8 *labels, u32 label[]) 1119966bae33SEric W. Biederman { 1120966bae33SEric W. Biederman unsigned len = nla_len(nla); 1121966bae33SEric W. Biederman unsigned nla_labels; 1122966bae33SEric W. Biederman struct mpls_shim_hdr *nla_label; 1123966bae33SEric W. Biederman bool bos; 1124966bae33SEric W. Biederman int i; 1125966bae33SEric W. Biederman 1126966bae33SEric W. Biederman /* len needs to be an even multiple of 4 (the label size) */ 1127966bae33SEric W. Biederman if (len & 3) 1128966bae33SEric W. Biederman return -EINVAL; 1129966bae33SEric W. Biederman 1130966bae33SEric W. Biederman /* Limit the number of new labels allowed */ 1131966bae33SEric W. Biederman nla_labels = len/4; 1132966bae33SEric W. Biederman if (nla_labels > max_labels) 1133966bae33SEric W. Biederman return -EINVAL; 1134966bae33SEric W. Biederman 1135966bae33SEric W. Biederman nla_label = nla_data(nla); 1136966bae33SEric W. Biederman bos = true; 1137966bae33SEric W. Biederman for (i = nla_labels - 1; i >= 0; i--, bos = false) { 1138966bae33SEric W. Biederman struct mpls_entry_decoded dec; 1139966bae33SEric W. Biederman dec = mpls_entry_decode(nla_label + i); 1140966bae33SEric W. Biederman 1141966bae33SEric W. Biederman /* Ensure the bottom of stack flag is properly set 1142966bae33SEric W. Biederman * and ttl and tc are both clear. 1143966bae33SEric W. Biederman */ 1144966bae33SEric W. Biederman if ((dec.bos != bos) || dec.ttl || dec.tc) 1145966bae33SEric W. Biederman return -EINVAL; 1146966bae33SEric W. Biederman 11475a9ab017SRobert Shearman switch (dec.label) { 114878f5b899STom Herbert case MPLS_LABEL_IMPLNULL: 11495a9ab017SRobert Shearman /* RFC3032: This is a label that an LSR may 11505a9ab017SRobert Shearman * assign and distribute, but which never 11515a9ab017SRobert Shearman * actually appears in the encapsulation. 11525a9ab017SRobert Shearman */ 11535a9ab017SRobert Shearman return -EINVAL; 11545a9ab017SRobert Shearman } 11555a9ab017SRobert Shearman 1156966bae33SEric W. Biederman label[i] = dec.label; 1157966bae33SEric W. Biederman } 1158966bae33SEric W. Biederman *labels = nla_labels; 1159966bae33SEric W. Biederman return 0; 1160966bae33SEric W. Biederman } 1161face0188SRoopa Prabhu EXPORT_SYMBOL_GPL(nla_get_labels); 1162966bae33SEric W. Biederman 1163f8efb73cSRoopa Prabhu int nla_get_via(const struct nlattr *nla, u8 *via_alen, 1164f8efb73cSRoopa Prabhu u8 *via_table, u8 via_addr[]) 1165f8efb73cSRoopa Prabhu { 1166f8efb73cSRoopa Prabhu struct rtvia *via = nla_data(nla); 1167f8efb73cSRoopa Prabhu int err = -EINVAL; 1168f8efb73cSRoopa Prabhu int alen; 1169f8efb73cSRoopa Prabhu 1170f8efb73cSRoopa Prabhu if (nla_len(nla) < offsetof(struct rtvia, rtvia_addr)) 1171f8efb73cSRoopa Prabhu goto errout; 1172f8efb73cSRoopa Prabhu alen = nla_len(nla) - 1173f8efb73cSRoopa Prabhu offsetof(struct rtvia, rtvia_addr); 1174f8efb73cSRoopa Prabhu if (alen > MAX_VIA_ALEN) 1175f8efb73cSRoopa Prabhu goto errout; 1176f8efb73cSRoopa Prabhu 1177f8efb73cSRoopa Prabhu /* Validate the address family */ 1178f8efb73cSRoopa Prabhu switch (via->rtvia_family) { 1179f8efb73cSRoopa Prabhu case AF_PACKET: 1180f8efb73cSRoopa Prabhu *via_table = NEIGH_LINK_TABLE; 1181f8efb73cSRoopa Prabhu break; 1182f8efb73cSRoopa Prabhu case AF_INET: 1183f8efb73cSRoopa Prabhu *via_table = NEIGH_ARP_TABLE; 1184f8efb73cSRoopa Prabhu if (alen != 4) 1185f8efb73cSRoopa Prabhu goto errout; 1186f8efb73cSRoopa Prabhu break; 1187f8efb73cSRoopa Prabhu case AF_INET6: 1188f8efb73cSRoopa Prabhu *via_table = NEIGH_ND_TABLE; 1189f8efb73cSRoopa Prabhu if (alen != 16) 1190f8efb73cSRoopa Prabhu goto errout; 1191f8efb73cSRoopa Prabhu break; 1192f8efb73cSRoopa Prabhu default: 1193f8efb73cSRoopa Prabhu /* Unsupported address family */ 1194f8efb73cSRoopa Prabhu goto errout; 1195f8efb73cSRoopa Prabhu } 1196f8efb73cSRoopa Prabhu 1197f8efb73cSRoopa Prabhu memcpy(via_addr, via->rtvia_addr, alen); 1198f8efb73cSRoopa Prabhu *via_alen = alen; 1199f8efb73cSRoopa Prabhu err = 0; 1200f8efb73cSRoopa Prabhu 1201f8efb73cSRoopa Prabhu errout: 1202f8efb73cSRoopa Prabhu return err; 1203f8efb73cSRoopa Prabhu } 1204f8efb73cSRoopa Prabhu 120503c05665SEric W. Biederman static int rtm_to_route_config(struct sk_buff *skb, struct nlmsghdr *nlh, 120603c05665SEric W. Biederman struct mpls_route_config *cfg) 120703c05665SEric W. Biederman { 120803c05665SEric W. Biederman struct rtmsg *rtm; 120903c05665SEric W. Biederman struct nlattr *tb[RTA_MAX+1]; 121003c05665SEric W. Biederman int index; 121103c05665SEric W. Biederman int err; 121203c05665SEric W. Biederman 121303c05665SEric W. Biederman err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_mpls_policy); 121403c05665SEric W. Biederman if (err < 0) 121503c05665SEric W. Biederman goto errout; 121603c05665SEric W. Biederman 121703c05665SEric W. Biederman err = -EINVAL; 121803c05665SEric W. Biederman rtm = nlmsg_data(nlh); 121903c05665SEric W. Biederman memset(cfg, 0, sizeof(*cfg)); 122003c05665SEric W. Biederman 122103c05665SEric W. Biederman if (rtm->rtm_family != AF_MPLS) 122203c05665SEric W. Biederman goto errout; 122303c05665SEric W. Biederman if (rtm->rtm_dst_len != 20) 122403c05665SEric W. Biederman goto errout; 122503c05665SEric W. Biederman if (rtm->rtm_src_len != 0) 122603c05665SEric W. Biederman goto errout; 122703c05665SEric W. Biederman if (rtm->rtm_tos != 0) 122803c05665SEric W. Biederman goto errout; 122903c05665SEric W. Biederman if (rtm->rtm_table != RT_TABLE_MAIN) 123003c05665SEric W. Biederman goto errout; 123103c05665SEric W. Biederman /* Any value is acceptable for rtm_protocol */ 123203c05665SEric W. Biederman 123303c05665SEric W. Biederman /* As mpls uses destination specific addresses 123403c05665SEric W. Biederman * (or source specific address in the case of multicast) 123503c05665SEric W. Biederman * all addresses have universal scope. 123603c05665SEric W. Biederman */ 123703c05665SEric W. Biederman if (rtm->rtm_scope != RT_SCOPE_UNIVERSE) 123803c05665SEric W. Biederman goto errout; 123903c05665SEric W. Biederman if (rtm->rtm_type != RTN_UNICAST) 124003c05665SEric W. Biederman goto errout; 124103c05665SEric W. Biederman if (rtm->rtm_flags != 0) 124203c05665SEric W. Biederman goto errout; 124303c05665SEric W. Biederman 124403c05665SEric W. Biederman cfg->rc_label = LABEL_NOT_SPECIFIED; 124503c05665SEric W. Biederman cfg->rc_protocol = rtm->rtm_protocol; 1246eb7809f0SRobert Shearman cfg->rc_via_table = MPLS_NEIGH_TABLE_UNSPEC; 124703c05665SEric W. Biederman cfg->rc_nlflags = nlh->nlmsg_flags; 124803c05665SEric W. Biederman cfg->rc_nlinfo.portid = NETLINK_CB(skb).portid; 124903c05665SEric W. Biederman cfg->rc_nlinfo.nlh = nlh; 125003c05665SEric W. Biederman cfg->rc_nlinfo.nl_net = sock_net(skb->sk); 125103c05665SEric W. Biederman 125203c05665SEric W. Biederman for (index = 0; index <= RTA_MAX; index++) { 125303c05665SEric W. Biederman struct nlattr *nla = tb[index]; 125403c05665SEric W. Biederman if (!nla) 125503c05665SEric W. Biederman continue; 125603c05665SEric W. Biederman 125703c05665SEric W. Biederman switch (index) { 125803c05665SEric W. Biederman case RTA_OIF: 125903c05665SEric W. Biederman cfg->rc_ifindex = nla_get_u32(nla); 126003c05665SEric W. Biederman break; 126103c05665SEric W. Biederman case RTA_NEWDST: 126203c05665SEric W. Biederman if (nla_get_labels(nla, MAX_NEW_LABELS, 126303c05665SEric W. Biederman &cfg->rc_output_labels, 126403c05665SEric W. Biederman cfg->rc_output_label)) 126503c05665SEric W. Biederman goto errout; 126603c05665SEric W. Biederman break; 126703c05665SEric W. Biederman case RTA_DST: 126803c05665SEric W. Biederman { 1269f8efb73cSRoopa Prabhu u8 label_count; 127003c05665SEric W. Biederman if (nla_get_labels(nla, 1, &label_count, 127103c05665SEric W. Biederman &cfg->rc_label)) 127203c05665SEric W. Biederman goto errout; 127303c05665SEric W. Biederman 1274a6affd24SRobert Shearman /* Reserved labels may not be set */ 1275a6affd24SRobert Shearman if (cfg->rc_label < MPLS_LABEL_FIRST_UNRESERVED) 127603c05665SEric W. Biederman goto errout; 127703c05665SEric W. Biederman 127803c05665SEric W. Biederman break; 127903c05665SEric W. Biederman } 128003c05665SEric W. Biederman case RTA_VIA: 128103c05665SEric W. Biederman { 1282f8efb73cSRoopa Prabhu if (nla_get_via(nla, &cfg->rc_via_alen, 1283f8efb73cSRoopa Prabhu &cfg->rc_via_table, cfg->rc_via)) 128403c05665SEric W. Biederman goto errout; 128503c05665SEric W. Biederman break; 128603c05665SEric W. Biederman } 1287f8efb73cSRoopa Prabhu case RTA_MULTIPATH: 1288f8efb73cSRoopa Prabhu { 1289f8efb73cSRoopa Prabhu cfg->rc_mp = nla_data(nla); 1290f8efb73cSRoopa Prabhu cfg->rc_mp_len = nla_len(nla); 129103c05665SEric W. Biederman break; 129203c05665SEric W. Biederman } 129303c05665SEric W. Biederman default: 129403c05665SEric W. Biederman /* Unsupported attribute */ 129503c05665SEric W. Biederman goto errout; 129603c05665SEric W. Biederman } 129703c05665SEric W. Biederman } 129803c05665SEric W. Biederman 129903c05665SEric W. Biederman err = 0; 130003c05665SEric W. Biederman errout: 130103c05665SEric W. Biederman return err; 130203c05665SEric W. Biederman } 130303c05665SEric W. Biederman 130403c05665SEric W. Biederman static int mpls_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) 130503c05665SEric W. Biederman { 130603c05665SEric W. Biederman struct mpls_route_config cfg; 130703c05665SEric W. Biederman int err; 130803c05665SEric W. Biederman 130903c05665SEric W. Biederman err = rtm_to_route_config(skb, nlh, &cfg); 131003c05665SEric W. Biederman if (err < 0) 131103c05665SEric W. Biederman return err; 131203c05665SEric W. Biederman 131303c05665SEric W. Biederman return mpls_route_del(&cfg); 131403c05665SEric W. Biederman } 131503c05665SEric W. Biederman 131603c05665SEric W. Biederman 131703c05665SEric W. Biederman static int mpls_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) 131803c05665SEric W. Biederman { 131903c05665SEric W. Biederman struct mpls_route_config cfg; 132003c05665SEric W. Biederman int err; 132103c05665SEric W. Biederman 132203c05665SEric W. Biederman err = rtm_to_route_config(skb, nlh, &cfg); 132303c05665SEric W. Biederman if (err < 0) 132403c05665SEric W. Biederman return err; 132503c05665SEric W. Biederman 132603c05665SEric W. Biederman return mpls_route_add(&cfg); 132703c05665SEric W. Biederman } 132803c05665SEric W. Biederman 132903c05665SEric W. Biederman static int mpls_dump_route(struct sk_buff *skb, u32 portid, u32 seq, int event, 133003c05665SEric W. Biederman u32 label, struct mpls_route *rt, int flags) 133103c05665SEric W. Biederman { 133219d0c341SEric W. Biederman struct net_device *dev; 133303c05665SEric W. Biederman struct nlmsghdr *nlh; 133403c05665SEric W. Biederman struct rtmsg *rtm; 133503c05665SEric W. Biederman 133603c05665SEric W. Biederman nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), flags); 133703c05665SEric W. Biederman if (nlh == NULL) 133803c05665SEric W. Biederman return -EMSGSIZE; 133903c05665SEric W. Biederman 134003c05665SEric W. Biederman rtm = nlmsg_data(nlh); 134103c05665SEric W. Biederman rtm->rtm_family = AF_MPLS; 134203c05665SEric W. Biederman rtm->rtm_dst_len = 20; 134303c05665SEric W. Biederman rtm->rtm_src_len = 0; 134403c05665SEric W. Biederman rtm->rtm_tos = 0; 134503c05665SEric W. Biederman rtm->rtm_table = RT_TABLE_MAIN; 134603c05665SEric W. Biederman rtm->rtm_protocol = rt->rt_protocol; 134703c05665SEric W. Biederman rtm->rtm_scope = RT_SCOPE_UNIVERSE; 134803c05665SEric W. Biederman rtm->rtm_type = RTN_UNICAST; 134903c05665SEric W. Biederman rtm->rtm_flags = 0; 135003c05665SEric W. Biederman 135103c05665SEric W. Biederman if (nla_put_labels(skb, RTA_DST, 1, &label)) 135203c05665SEric W. Biederman goto nla_put_failure; 1353f8efb73cSRoopa Prabhu if (rt->rt_nhn == 1) { 1354cf4b24f0SRobert Shearman const struct mpls_nh *nh = rt->rt_nh; 1355f8efb73cSRoopa Prabhu 1356f8efb73cSRoopa Prabhu if (nh->nh_labels && 1357f8efb73cSRoopa Prabhu nla_put_labels(skb, RTA_NEWDST, nh->nh_labels, 1358f8efb73cSRoopa Prabhu nh->nh_label)) 1359f8efb73cSRoopa Prabhu goto nla_put_failure; 1360eb7809f0SRobert Shearman if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 136172dcac96SRobert Shearman nla_put_via(skb, nh->nh_via_table, mpls_nh_via(rt, nh), 1362f8efb73cSRoopa Prabhu nh->nh_via_alen)) 1363f8efb73cSRoopa Prabhu goto nla_put_failure; 1364f8efb73cSRoopa Prabhu dev = rtnl_dereference(nh->nh_dev); 1365f8efb73cSRoopa Prabhu if (dev && nla_put_u32(skb, RTA_OIF, dev->ifindex)) 1366f8efb73cSRoopa Prabhu goto nla_put_failure; 1367c89359a4SRoopa Prabhu if (nh->nh_flags & RTNH_F_LINKDOWN) 1368c89359a4SRoopa Prabhu rtm->rtm_flags |= RTNH_F_LINKDOWN; 1369c89359a4SRoopa Prabhu if (nh->nh_flags & RTNH_F_DEAD) 1370c89359a4SRoopa Prabhu rtm->rtm_flags |= RTNH_F_DEAD; 1371f8efb73cSRoopa Prabhu } else { 1372f8efb73cSRoopa Prabhu struct rtnexthop *rtnh; 1373f8efb73cSRoopa Prabhu struct nlattr *mp; 1374c89359a4SRoopa Prabhu int dead = 0; 1375c89359a4SRoopa Prabhu int linkdown = 0; 1376f8efb73cSRoopa Prabhu 1377f8efb73cSRoopa Prabhu mp = nla_nest_start(skb, RTA_MULTIPATH); 1378f8efb73cSRoopa Prabhu if (!mp) 1379f8efb73cSRoopa Prabhu goto nla_put_failure; 1380f8efb73cSRoopa Prabhu 1381f8efb73cSRoopa Prabhu for_nexthops(rt) { 1382f8efb73cSRoopa Prabhu rtnh = nla_reserve_nohdr(skb, sizeof(*rtnh)); 1383f8efb73cSRoopa Prabhu if (!rtnh) 1384f8efb73cSRoopa Prabhu goto nla_put_failure; 1385f8efb73cSRoopa Prabhu 1386f8efb73cSRoopa Prabhu dev = rtnl_dereference(nh->nh_dev); 1387f8efb73cSRoopa Prabhu if (dev) 1388f8efb73cSRoopa Prabhu rtnh->rtnh_ifindex = dev->ifindex; 1389c89359a4SRoopa Prabhu if (nh->nh_flags & RTNH_F_LINKDOWN) { 1390c89359a4SRoopa Prabhu rtnh->rtnh_flags |= RTNH_F_LINKDOWN; 1391c89359a4SRoopa Prabhu linkdown++; 1392c89359a4SRoopa Prabhu } 1393c89359a4SRoopa Prabhu if (nh->nh_flags & RTNH_F_DEAD) { 1394c89359a4SRoopa Prabhu rtnh->rtnh_flags |= RTNH_F_DEAD; 1395c89359a4SRoopa Prabhu dead++; 1396c89359a4SRoopa Prabhu } 1397c89359a4SRoopa Prabhu 1398f8efb73cSRoopa Prabhu if (nh->nh_labels && nla_put_labels(skb, RTA_NEWDST, 1399f8efb73cSRoopa Prabhu nh->nh_labels, 1400f8efb73cSRoopa Prabhu nh->nh_label)) 1401f8efb73cSRoopa Prabhu goto nla_put_failure; 1402f20367dfSRobert Shearman if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC && 1403f20367dfSRobert Shearman nla_put_via(skb, nh->nh_via_table, 1404cf4b24f0SRobert Shearman mpls_nh_via(rt, nh), 1405f8efb73cSRoopa Prabhu nh->nh_via_alen)) 1406f8efb73cSRoopa Prabhu goto nla_put_failure; 1407f8efb73cSRoopa Prabhu 1408f8efb73cSRoopa Prabhu /* length of rtnetlink header + attributes */ 1409f8efb73cSRoopa Prabhu rtnh->rtnh_len = nlmsg_get_pos(skb) - (void *)rtnh; 1410f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 1411f8efb73cSRoopa Prabhu 1412c89359a4SRoopa Prabhu if (linkdown == rt->rt_nhn) 1413c89359a4SRoopa Prabhu rtm->rtm_flags |= RTNH_F_LINKDOWN; 1414c89359a4SRoopa Prabhu if (dead == rt->rt_nhn) 1415c89359a4SRoopa Prabhu rtm->rtm_flags |= RTNH_F_DEAD; 1416c89359a4SRoopa Prabhu 1417f8efb73cSRoopa Prabhu nla_nest_end(skb, mp); 1418f8efb73cSRoopa Prabhu } 141903c05665SEric W. Biederman 142003c05665SEric W. Biederman nlmsg_end(skb, nlh); 142103c05665SEric W. Biederman return 0; 142203c05665SEric W. Biederman 142303c05665SEric W. Biederman nla_put_failure: 142403c05665SEric W. Biederman nlmsg_cancel(skb, nlh); 142503c05665SEric W. Biederman return -EMSGSIZE; 142603c05665SEric W. Biederman } 142703c05665SEric W. Biederman 142803c05665SEric W. Biederman static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) 142903c05665SEric W. Biederman { 143003c05665SEric W. Biederman struct net *net = sock_net(skb->sk); 143119d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 143219d0c341SEric W. Biederman size_t platform_labels; 143303c05665SEric W. Biederman unsigned int index; 143403c05665SEric W. Biederman 143503c05665SEric W. Biederman ASSERT_RTNL(); 143603c05665SEric W. Biederman 143703c05665SEric W. Biederman index = cb->args[0]; 1438a6affd24SRobert Shearman if (index < MPLS_LABEL_FIRST_UNRESERVED) 1439a6affd24SRobert Shearman index = MPLS_LABEL_FIRST_UNRESERVED; 144003c05665SEric W. Biederman 144119d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 144219d0c341SEric W. Biederman platform_labels = net->mpls.platform_labels; 144319d0c341SEric W. Biederman for (; index < platform_labels; index++) { 144403c05665SEric W. Biederman struct mpls_route *rt; 144519d0c341SEric W. Biederman rt = rtnl_dereference(platform_label[index]); 144603c05665SEric W. Biederman if (!rt) 144703c05665SEric W. Biederman continue; 144803c05665SEric W. Biederman 144903c05665SEric W. Biederman if (mpls_dump_route(skb, NETLINK_CB(cb->skb).portid, 145003c05665SEric W. Biederman cb->nlh->nlmsg_seq, RTM_NEWROUTE, 145103c05665SEric W. Biederman index, rt, NLM_F_MULTI) < 0) 145203c05665SEric W. Biederman break; 145303c05665SEric W. Biederman } 145403c05665SEric W. Biederman cb->args[0] = index; 145503c05665SEric W. Biederman 145603c05665SEric W. Biederman return skb->len; 145703c05665SEric W. Biederman } 145803c05665SEric W. Biederman 14598de147dcSEric W. Biederman static inline size_t lfib_nlmsg_size(struct mpls_route *rt) 14608de147dcSEric W. Biederman { 14618de147dcSEric W. Biederman size_t payload = 14628de147dcSEric W. Biederman NLMSG_ALIGN(sizeof(struct rtmsg)) 14638de147dcSEric W. Biederman + nla_total_size(4); /* RTA_DST */ 1464f8efb73cSRoopa Prabhu 1465f8efb73cSRoopa Prabhu if (rt->rt_nhn == 1) { 1466f8efb73cSRoopa Prabhu struct mpls_nh *nh = rt->rt_nh; 1467f8efb73cSRoopa Prabhu 1468f8efb73cSRoopa Prabhu if (nh->nh_dev) 1469f8efb73cSRoopa Prabhu payload += nla_total_size(4); /* RTA_OIF */ 1470eb7809f0SRobert Shearman if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) /* RTA_VIA */ 147172dcac96SRobert Shearman payload += nla_total_size(2 + nh->nh_via_alen); 1472f8efb73cSRoopa Prabhu if (nh->nh_labels) /* RTA_NEWDST */ 1473f8efb73cSRoopa Prabhu payload += nla_total_size(nh->nh_labels * 4); 1474f8efb73cSRoopa Prabhu } else { 1475f8efb73cSRoopa Prabhu /* each nexthop is packed in an attribute */ 1476f8efb73cSRoopa Prabhu size_t nhsize = 0; 1477f8efb73cSRoopa Prabhu 1478f8efb73cSRoopa Prabhu for_nexthops(rt) { 1479f8efb73cSRoopa Prabhu nhsize += nla_total_size(sizeof(struct rtnexthop)); 1480f20367dfSRobert Shearman /* RTA_VIA */ 1481f20367dfSRobert Shearman if (nh->nh_via_table != MPLS_NEIGH_TABLE_UNSPEC) 1482f8efb73cSRoopa Prabhu nhsize += nla_total_size(2 + nh->nh_via_alen); 1483f8efb73cSRoopa Prabhu if (nh->nh_labels) 1484f8efb73cSRoopa Prabhu nhsize += nla_total_size(nh->nh_labels * 4); 1485f8efb73cSRoopa Prabhu } endfor_nexthops(rt); 1486f8efb73cSRoopa Prabhu /* nested attribute */ 1487f8efb73cSRoopa Prabhu payload += nla_total_size(nhsize); 1488f8efb73cSRoopa Prabhu } 1489f8efb73cSRoopa Prabhu 14908de147dcSEric W. Biederman return payload; 14918de147dcSEric W. Biederman } 14928de147dcSEric W. Biederman 14938de147dcSEric W. Biederman static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, 14948de147dcSEric W. Biederman struct nlmsghdr *nlh, struct net *net, u32 portid, 14958de147dcSEric W. Biederman unsigned int nlm_flags) 14968de147dcSEric W. Biederman { 14978de147dcSEric W. Biederman struct sk_buff *skb; 14988de147dcSEric W. Biederman u32 seq = nlh ? nlh->nlmsg_seq : 0; 14998de147dcSEric W. Biederman int err = -ENOBUFS; 15008de147dcSEric W. Biederman 15018de147dcSEric W. Biederman skb = nlmsg_new(lfib_nlmsg_size(rt), GFP_KERNEL); 15028de147dcSEric W. Biederman if (skb == NULL) 15038de147dcSEric W. Biederman goto errout; 15048de147dcSEric W. Biederman 15058de147dcSEric W. Biederman err = mpls_dump_route(skb, portid, seq, event, label, rt, nlm_flags); 15068de147dcSEric W. Biederman if (err < 0) { 15078de147dcSEric W. Biederman /* -EMSGSIZE implies BUG in lfib_nlmsg_size */ 15088de147dcSEric W. Biederman WARN_ON(err == -EMSGSIZE); 15098de147dcSEric W. Biederman kfree_skb(skb); 15108de147dcSEric W. Biederman goto errout; 15118de147dcSEric W. Biederman } 15128de147dcSEric W. Biederman rtnl_notify(skb, net, portid, RTNLGRP_MPLS_ROUTE, nlh, GFP_KERNEL); 15138de147dcSEric W. Biederman 15148de147dcSEric W. Biederman return; 15158de147dcSEric W. Biederman errout: 15168de147dcSEric W. Biederman if (err < 0) 15178de147dcSEric W. Biederman rtnl_set_sk_err(net, RTNLGRP_MPLS_ROUTE, err); 15188de147dcSEric W. Biederman } 15198de147dcSEric W. Biederman 15207720c01fSEric W. Biederman static int resize_platform_label_table(struct net *net, size_t limit) 15217720c01fSEric W. Biederman { 15227720c01fSEric W. Biederman size_t size = sizeof(struct mpls_route *) * limit; 15237720c01fSEric W. Biederman size_t old_limit; 15247720c01fSEric W. Biederman size_t cp_size; 15257720c01fSEric W. Biederman struct mpls_route __rcu **labels = NULL, **old; 15267720c01fSEric W. Biederman struct mpls_route *rt0 = NULL, *rt2 = NULL; 15277720c01fSEric W. Biederman unsigned index; 15287720c01fSEric W. Biederman 15297720c01fSEric W. Biederman if (size) { 15307720c01fSEric W. Biederman labels = kzalloc(size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY); 15317720c01fSEric W. Biederman if (!labels) 15327720c01fSEric W. Biederman labels = vzalloc(size); 15337720c01fSEric W. Biederman 15347720c01fSEric W. Biederman if (!labels) 15357720c01fSEric W. Biederman goto nolabels; 15367720c01fSEric W. Biederman } 15377720c01fSEric W. Biederman 15387720c01fSEric W. Biederman /* In case the predefined labels need to be populated */ 153978f5b899STom Herbert if (limit > MPLS_LABEL_IPV4NULL) { 15407720c01fSEric W. Biederman struct net_device *lo = net->loopback_dev; 1541cf4b24f0SRobert Shearman rt0 = mpls_rt_alloc(1, lo->addr_len); 15427720c01fSEric W. Biederman if (!rt0) 15437720c01fSEric W. Biederman goto nort0; 1544f8efb73cSRoopa Prabhu RCU_INIT_POINTER(rt0->rt_nh->nh_dev, lo); 15457720c01fSEric W. Biederman rt0->rt_protocol = RTPROT_KERNEL; 1546118d5234SRobert Shearman rt0->rt_payload_type = MPT_IPV4; 1547f8efb73cSRoopa Prabhu rt0->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 1548b4e04fc7SRobert Shearman rt0->rt_nh->nh_via_alen = lo->addr_len; 1549cf4b24f0SRobert Shearman memcpy(__mpls_nh_via(rt0, rt0->rt_nh), lo->dev_addr, 1550cf4b24f0SRobert Shearman lo->addr_len); 15517720c01fSEric W. Biederman } 155278f5b899STom Herbert if (limit > MPLS_LABEL_IPV6NULL) { 15537720c01fSEric W. Biederman struct net_device *lo = net->loopback_dev; 1554cf4b24f0SRobert Shearman rt2 = mpls_rt_alloc(1, lo->addr_len); 15557720c01fSEric W. Biederman if (!rt2) 15567720c01fSEric W. Biederman goto nort2; 1557f8efb73cSRoopa Prabhu RCU_INIT_POINTER(rt2->rt_nh->nh_dev, lo); 15587720c01fSEric W. Biederman rt2->rt_protocol = RTPROT_KERNEL; 1559118d5234SRobert Shearman rt2->rt_payload_type = MPT_IPV6; 1560f8efb73cSRoopa Prabhu rt2->rt_nh->nh_via_table = NEIGH_LINK_TABLE; 1561b4e04fc7SRobert Shearman rt2->rt_nh->nh_via_alen = lo->addr_len; 1562cf4b24f0SRobert Shearman memcpy(__mpls_nh_via(rt2, rt2->rt_nh), lo->dev_addr, 1563cf4b24f0SRobert Shearman lo->addr_len); 15647720c01fSEric W. Biederman } 15657720c01fSEric W. Biederman 15667720c01fSEric W. Biederman rtnl_lock(); 15677720c01fSEric W. Biederman /* Remember the original table */ 156819d0c341SEric W. Biederman old = rtnl_dereference(net->mpls.platform_label); 15697720c01fSEric W. Biederman old_limit = net->mpls.platform_labels; 15707720c01fSEric W. Biederman 15717720c01fSEric W. Biederman /* Free any labels beyond the new table */ 15727720c01fSEric W. Biederman for (index = limit; index < old_limit; index++) 1573f8efb73cSRoopa Prabhu mpls_route_update(net, index, NULL, NULL); 15747720c01fSEric W. Biederman 15757720c01fSEric W. Biederman /* Copy over the old labels */ 15767720c01fSEric W. Biederman cp_size = size; 15777720c01fSEric W. Biederman if (old_limit < limit) 15787720c01fSEric W. Biederman cp_size = old_limit * sizeof(struct mpls_route *); 15797720c01fSEric W. Biederman 15807720c01fSEric W. Biederman memcpy(labels, old, cp_size); 15817720c01fSEric W. Biederman 15827720c01fSEric W. Biederman /* If needed set the predefined labels */ 158378f5b899STom Herbert if ((old_limit <= MPLS_LABEL_IPV6NULL) && 158478f5b899STom Herbert (limit > MPLS_LABEL_IPV6NULL)) { 158578f5b899STom Herbert RCU_INIT_POINTER(labels[MPLS_LABEL_IPV6NULL], rt2); 15867720c01fSEric W. Biederman rt2 = NULL; 15877720c01fSEric W. Biederman } 15887720c01fSEric W. Biederman 158978f5b899STom Herbert if ((old_limit <= MPLS_LABEL_IPV4NULL) && 159078f5b899STom Herbert (limit > MPLS_LABEL_IPV4NULL)) { 159178f5b899STom Herbert RCU_INIT_POINTER(labels[MPLS_LABEL_IPV4NULL], rt0); 15927720c01fSEric W. Biederman rt0 = NULL; 15937720c01fSEric W. Biederman } 15947720c01fSEric W. Biederman 15957720c01fSEric W. Biederman /* Update the global pointers */ 15967720c01fSEric W. Biederman net->mpls.platform_labels = limit; 159719d0c341SEric W. Biederman rcu_assign_pointer(net->mpls.platform_label, labels); 15987720c01fSEric W. Biederman 15997720c01fSEric W. Biederman rtnl_unlock(); 16007720c01fSEric W. Biederman 16017720c01fSEric W. Biederman mpls_rt_free(rt2); 16027720c01fSEric W. Biederman mpls_rt_free(rt0); 16037720c01fSEric W. Biederman 16047720c01fSEric W. Biederman if (old) { 16057720c01fSEric W. Biederman synchronize_rcu(); 16067720c01fSEric W. Biederman kvfree(old); 16077720c01fSEric W. Biederman } 16087720c01fSEric W. Biederman return 0; 16097720c01fSEric W. Biederman 16107720c01fSEric W. Biederman nort2: 16117720c01fSEric W. Biederman mpls_rt_free(rt0); 16127720c01fSEric W. Biederman nort0: 16137720c01fSEric W. Biederman kvfree(labels); 16147720c01fSEric W. Biederman nolabels: 16157720c01fSEric W. Biederman return -ENOMEM; 16167720c01fSEric W. Biederman } 16177720c01fSEric W. Biederman 16187720c01fSEric W. Biederman static int mpls_platform_labels(struct ctl_table *table, int write, 16197720c01fSEric W. Biederman void __user *buffer, size_t *lenp, loff_t *ppos) 16207720c01fSEric W. Biederman { 16217720c01fSEric W. Biederman struct net *net = table->data; 16227720c01fSEric W. Biederman int platform_labels = net->mpls.platform_labels; 16237720c01fSEric W. Biederman int ret; 16247720c01fSEric W. Biederman struct ctl_table tmp = { 16257720c01fSEric W. Biederman .procname = table->procname, 16267720c01fSEric W. Biederman .data = &platform_labels, 16277720c01fSEric W. Biederman .maxlen = sizeof(int), 16287720c01fSEric W. Biederman .mode = table->mode, 16297720c01fSEric W. Biederman .extra1 = &zero, 16307720c01fSEric W. Biederman .extra2 = &label_limit, 16317720c01fSEric W. Biederman }; 16327720c01fSEric W. Biederman 16337720c01fSEric W. Biederman ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 16347720c01fSEric W. Biederman 16357720c01fSEric W. Biederman if (write && ret == 0) 16367720c01fSEric W. Biederman ret = resize_platform_label_table(net, platform_labels); 16377720c01fSEric W. Biederman 16387720c01fSEric W. Biederman return ret; 16397720c01fSEric W. Biederman } 16407720c01fSEric W. Biederman 164137bde799SRobert Shearman static const struct ctl_table mpls_table[] = { 16427720c01fSEric W. Biederman { 16437720c01fSEric W. Biederman .procname = "platform_labels", 16447720c01fSEric W. Biederman .data = NULL, 16457720c01fSEric W. Biederman .maxlen = sizeof(int), 16467720c01fSEric W. Biederman .mode = 0644, 16477720c01fSEric W. Biederman .proc_handler = mpls_platform_labels, 16487720c01fSEric W. Biederman }, 16497720c01fSEric W. Biederman { } 16507720c01fSEric W. Biederman }; 16517720c01fSEric W. Biederman 16520189197fSEric W. Biederman static int mpls_net_init(struct net *net) 16530189197fSEric W. Biederman { 16547720c01fSEric W. Biederman struct ctl_table *table; 16557720c01fSEric W. Biederman 16560189197fSEric W. Biederman net->mpls.platform_labels = 0; 16570189197fSEric W. Biederman net->mpls.platform_label = NULL; 16580189197fSEric W. Biederman 16597720c01fSEric W. Biederman table = kmemdup(mpls_table, sizeof(mpls_table), GFP_KERNEL); 16607720c01fSEric W. Biederman if (table == NULL) 16617720c01fSEric W. Biederman return -ENOMEM; 16627720c01fSEric W. Biederman 16637720c01fSEric W. Biederman table[0].data = net; 16647720c01fSEric W. Biederman net->mpls.ctl = register_net_sysctl(net, "net/mpls", table); 16656ea3c9d5SNikolay Aleksandrov if (net->mpls.ctl == NULL) { 16666ea3c9d5SNikolay Aleksandrov kfree(table); 16677720c01fSEric W. Biederman return -ENOMEM; 16686ea3c9d5SNikolay Aleksandrov } 16697720c01fSEric W. Biederman 16700189197fSEric W. Biederman return 0; 16710189197fSEric W. Biederman } 16720189197fSEric W. Biederman 16730189197fSEric W. Biederman static void mpls_net_exit(struct net *net) 16740189197fSEric W. Biederman { 167519d0c341SEric W. Biederman struct mpls_route __rcu **platform_label; 167619d0c341SEric W. Biederman size_t platform_labels; 16777720c01fSEric W. Biederman struct ctl_table *table; 16780189197fSEric W. Biederman unsigned int index; 16790189197fSEric W. Biederman 16807720c01fSEric W. Biederman table = net->mpls.ctl->ctl_table_arg; 16817720c01fSEric W. Biederman unregister_net_sysctl_table(net->mpls.ctl); 16827720c01fSEric W. Biederman kfree(table); 16837720c01fSEric W. Biederman 168419d0c341SEric W. Biederman /* An rcu grace period has passed since there was a device in 168519d0c341SEric W. Biederman * the network namespace (and thus the last in flight packet) 16860189197fSEric W. Biederman * left this network namespace. This is because 16870189197fSEric W. Biederman * unregister_netdevice_many and netdev_run_todo has completed 16880189197fSEric W. Biederman * for each network device that was in this network namespace. 16890189197fSEric W. Biederman * 16900189197fSEric W. Biederman * As such no additional rcu synchronization is necessary when 16910189197fSEric W. Biederman * freeing the platform_label table. 16920189197fSEric W. Biederman */ 16930189197fSEric W. Biederman rtnl_lock(); 169419d0c341SEric W. Biederman platform_label = rtnl_dereference(net->mpls.platform_label); 169519d0c341SEric W. Biederman platform_labels = net->mpls.platform_labels; 169619d0c341SEric W. Biederman for (index = 0; index < platform_labels; index++) { 169719d0c341SEric W. Biederman struct mpls_route *rt = rtnl_dereference(platform_label[index]); 169819d0c341SEric W. Biederman RCU_INIT_POINTER(platform_label[index], NULL); 16990189197fSEric W. Biederman mpls_rt_free(rt); 17000189197fSEric W. Biederman } 17010189197fSEric W. Biederman rtnl_unlock(); 17020189197fSEric W. Biederman 170319d0c341SEric W. Biederman kvfree(platform_label); 17040189197fSEric W. Biederman } 17050189197fSEric W. Biederman 17060189197fSEric W. Biederman static struct pernet_operations mpls_net_ops = { 17070189197fSEric W. Biederman .init = mpls_net_init, 17080189197fSEric W. Biederman .exit = mpls_net_exit, 17090189197fSEric W. Biederman }; 17100189197fSEric W. Biederman 17110189197fSEric W. Biederman static int __init mpls_init(void) 17120189197fSEric W. Biederman { 17130189197fSEric W. Biederman int err; 17140189197fSEric W. Biederman 17150189197fSEric W. Biederman BUILD_BUG_ON(sizeof(struct mpls_shim_hdr) != 4); 17160189197fSEric W. Biederman 17170189197fSEric W. Biederman err = register_pernet_subsys(&mpls_net_ops); 17180189197fSEric W. Biederman if (err) 17190189197fSEric W. Biederman goto out; 17200189197fSEric W. Biederman 17210189197fSEric W. Biederman err = register_netdevice_notifier(&mpls_dev_notifier); 17220189197fSEric W. Biederman if (err) 17230189197fSEric W. Biederman goto out_unregister_pernet; 17240189197fSEric W. Biederman 17250189197fSEric W. Biederman dev_add_pack(&mpls_packet_type); 17260189197fSEric W. Biederman 172703c05665SEric W. Biederman rtnl_register(PF_MPLS, RTM_NEWROUTE, mpls_rtm_newroute, NULL, NULL); 172803c05665SEric W. Biederman rtnl_register(PF_MPLS, RTM_DELROUTE, mpls_rtm_delroute, NULL, NULL); 172903c05665SEric W. Biederman rtnl_register(PF_MPLS, RTM_GETROUTE, NULL, mpls_dump_routes, NULL); 17300189197fSEric W. Biederman err = 0; 17310189197fSEric W. Biederman out: 17320189197fSEric W. Biederman return err; 17330189197fSEric W. Biederman 17340189197fSEric W. Biederman out_unregister_pernet: 17350189197fSEric W. Biederman unregister_pernet_subsys(&mpls_net_ops); 17360189197fSEric W. Biederman goto out; 17370189197fSEric W. Biederman } 17380189197fSEric W. Biederman module_init(mpls_init); 17390189197fSEric W. Biederman 17400189197fSEric W. Biederman static void __exit mpls_exit(void) 17410189197fSEric W. Biederman { 174203c05665SEric W. Biederman rtnl_unregister_all(PF_MPLS); 17430189197fSEric W. Biederman dev_remove_pack(&mpls_packet_type); 17440189197fSEric W. Biederman unregister_netdevice_notifier(&mpls_dev_notifier); 17450189197fSEric W. Biederman unregister_pernet_subsys(&mpls_net_ops); 17460189197fSEric W. Biederman } 17470189197fSEric W. Biederman module_exit(mpls_exit); 17480189197fSEric W. Biederman 17490189197fSEric W. Biederman MODULE_DESCRIPTION("MultiProtocol Label Switching"); 17500189197fSEric W. Biederman MODULE_LICENSE("GPL v2"); 17510189197fSEric W. Biederman MODULE_ALIAS_NETPROTO(PF_MPLS); 1752