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Commit | Line | Data |
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2d07dc79 JL |
1 | /* |
2 | * GENEVE: Generic Network Virtualization Encapsulation | |
3 | * | |
4 | * Copyright (c) 2015 Red Hat, Inc. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
2d07dc79 JL |
15 | #include <linux/etherdevice.h> |
16 | #include <linux/hash.h> | |
e305ac6c | 17 | #include <net/dst_metadata.h> |
8e816df8 | 18 | #include <net/gro_cells.h> |
2d07dc79 JL |
19 | #include <net/rtnetlink.h> |
20 | #include <net/geneve.h> | |
371bd106 | 21 | #include <net/protocol.h> |
2d07dc79 JL |
22 | |
23 | #define GENEVE_NETDEV_VER "0.6" | |
24 | ||
25 | #define GENEVE_UDP_PORT 6081 | |
26 | ||
27 | #define GENEVE_N_VID (1u << 24) | |
28 | #define GENEVE_VID_MASK (GENEVE_N_VID - 1) | |
29 | ||
30 | #define VNI_HASH_BITS 10 | |
31 | #define VNI_HASH_SIZE (1<<VNI_HASH_BITS) | |
32 | ||
33 | static bool log_ecn_error = true; | |
34 | module_param(log_ecn_error, bool, 0644); | |
35 | MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN"); | |
36 | ||
371bd106 PS |
37 | #define GENEVE_VER 0 |
38 | #define GENEVE_BASE_HLEN (sizeof(struct udphdr) + sizeof(struct genevehdr)) | |
39 | ||
2d07dc79 JL |
40 | /* per-network namespace private data for this module */ |
41 | struct geneve_net { | |
371bd106 | 42 | struct list_head geneve_list; |
371bd106 | 43 | struct list_head sock_list; |
2d07dc79 JL |
44 | }; |
45 | ||
c7d03a00 | 46 | static unsigned int geneve_net_id; |
371bd106 | 47 | |
4b4c21fa JB |
48 | struct geneve_dev_node { |
49 | struct hlist_node hlist; | |
50 | struct geneve_dev *geneve; | |
51 | }; | |
52 | ||
2d07dc79 JL |
53 | /* Pseudo network device */ |
54 | struct geneve_dev { | |
4b4c21fa JB |
55 | struct geneve_dev_node hlist4; /* vni hash table for IPv4 socket */ |
56 | #if IS_ENABLED(CONFIG_IPV6) | |
57 | struct geneve_dev_node hlist6; /* vni hash table for IPv6 socket */ | |
58 | #endif | |
2d07dc79 JL |
59 | struct net *net; /* netns for packet i/o */ |
60 | struct net_device *dev; /* netdev for geneve tunnel */ | |
9b4437a5 | 61 | struct ip_tunnel_info info; |
fceb9c3e | 62 | struct geneve_sock __rcu *sock4; /* IPv4 socket used for geneve tunnel */ |
8ed66f0e | 63 | #if IS_ENABLED(CONFIG_IPV6) |
fceb9c3e | 64 | struct geneve_sock __rcu *sock6; /* IPv6 socket used for geneve tunnel */ |
8ed66f0e | 65 | #endif |
2d07dc79 | 66 | struct list_head next; /* geneve's per namespace list */ |
8e816df8 | 67 | struct gro_cells gro_cells; |
9b4437a5 | 68 | bool collect_md; |
69 | bool use_udp6_rx_checksums; | |
2d07dc79 JL |
70 | }; |
71 | ||
371bd106 PS |
72 | struct geneve_sock { |
73 | bool collect_md; | |
371bd106 PS |
74 | struct list_head list; |
75 | struct socket *sock; | |
76 | struct rcu_head rcu; | |
77 | int refcnt; | |
66d47003 | 78 | struct hlist_head vni_list[VNI_HASH_SIZE]; |
371bd106 | 79 | }; |
2d07dc79 JL |
80 | |
81 | static inline __u32 geneve_net_vni_hash(u8 vni[3]) | |
82 | { | |
83 | __u32 vnid; | |
84 | ||
85 | vnid = (vni[0] << 16) | (vni[1] << 8) | vni[2]; | |
86 | return hash_32(vnid, VNI_HASH_BITS); | |
87 | } | |
88 | ||
e305ac6c PS |
89 | static __be64 vni_to_tunnel_id(const __u8 *vni) |
90 | { | |
91 | #ifdef __BIG_ENDIAN | |
92 | return (vni[0] << 16) | (vni[1] << 8) | vni[2]; | |
93 | #else | |
94 | return (__force __be64)(((__force u64)vni[0] << 40) | | |
95 | ((__force u64)vni[1] << 48) | | |
96 | ((__force u64)vni[2] << 56)); | |
97 | #endif | |
98 | } | |
99 | ||
9b4437a5 | 100 | /* Convert 64 bit tunnel ID to 24 bit VNI. */ |
101 | static void tunnel_id_to_vni(__be64 tun_id, __u8 *vni) | |
102 | { | |
103 | #ifdef __BIG_ENDIAN | |
104 | vni[0] = (__force __u8)(tun_id >> 16); | |
105 | vni[1] = (__force __u8)(tun_id >> 8); | |
106 | vni[2] = (__force __u8)tun_id; | |
107 | #else | |
108 | vni[0] = (__force __u8)((__force u64)tun_id >> 40); | |
109 | vni[1] = (__force __u8)((__force u64)tun_id >> 48); | |
110 | vni[2] = (__force __u8)((__force u64)tun_id >> 56); | |
111 | #endif | |
112 | } | |
113 | ||
2e0b26e1 | 114 | static bool eq_tun_id_and_vni(u8 *tun_id, u8 *vni) |
115 | { | |
116 | #ifdef __BIG_ENDIAN | |
117 | return (vni[0] == tun_id[2]) && | |
118 | (vni[1] == tun_id[1]) && | |
119 | (vni[2] == tun_id[0]); | |
120 | #else | |
121 | return !memcmp(vni, &tun_id[5], 3); | |
122 | #endif | |
123 | } | |
124 | ||
1e9f12ec JB |
125 | static sa_family_t geneve_get_sk_family(struct geneve_sock *gs) |
126 | { | |
127 | return gs->sock->sk->sk_family; | |
128 | } | |
129 | ||
66d47003 | 130 | static struct geneve_dev *geneve_lookup(struct geneve_sock *gs, |
371bd106 | 131 | __be32 addr, u8 vni[]) |
2d07dc79 | 132 | { |
2d07dc79 | 133 | struct hlist_head *vni_list_head; |
4b4c21fa | 134 | struct geneve_dev_node *node; |
2d07dc79 JL |
135 | __u32 hash; |
136 | ||
2d07dc79 | 137 | /* Find the device for this VNI */ |
371bd106 | 138 | hash = geneve_net_vni_hash(vni); |
66d47003 | 139 | vni_list_head = &gs->vni_list[hash]; |
4b4c21fa JB |
140 | hlist_for_each_entry_rcu(node, vni_list_head, hlist) { |
141 | if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) && | |
142 | addr == node->geneve->info.key.u.ipv4.dst) | |
143 | return node->geneve; | |
8ed66f0e JL |
144 | } |
145 | return NULL; | |
146 | } | |
147 | ||
148 | #if IS_ENABLED(CONFIG_IPV6) | |
149 | static struct geneve_dev *geneve6_lookup(struct geneve_sock *gs, | |
150 | struct in6_addr addr6, u8 vni[]) | |
151 | { | |
152 | struct hlist_head *vni_list_head; | |
4b4c21fa | 153 | struct geneve_dev_node *node; |
8ed66f0e JL |
154 | __u32 hash; |
155 | ||
156 | /* Find the device for this VNI */ | |
157 | hash = geneve_net_vni_hash(vni); | |
158 | vni_list_head = &gs->vni_list[hash]; | |
4b4c21fa JB |
159 | hlist_for_each_entry_rcu(node, vni_list_head, hlist) { |
160 | if (eq_tun_id_and_vni((u8 *)&node->geneve->info.key.tun_id, vni) && | |
161 | ipv6_addr_equal(&addr6, &node->geneve->info.key.u.ipv6.dst)) | |
162 | return node->geneve; | |
2d07dc79 | 163 | } |
e305ac6c PS |
164 | return NULL; |
165 | } | |
8ed66f0e | 166 | #endif |
e305ac6c | 167 | |
371bd106 PS |
168 | static inline struct genevehdr *geneve_hdr(const struct sk_buff *skb) |
169 | { | |
170 | return (struct genevehdr *)(udp_hdr(skb) + 1); | |
171 | } | |
172 | ||
9fc47545 JB |
173 | static struct geneve_dev *geneve_lookup_skb(struct geneve_sock *gs, |
174 | struct sk_buff *skb) | |
e305ac6c | 175 | { |
8ed66f0e | 176 | static u8 zero_vni[3]; |
9b4437a5 | 177 | u8 *vni; |
e305ac6c | 178 | |
1e9f12ec | 179 | if (geneve_get_sk_family(gs) == AF_INET) { |
9fc47545 | 180 | struct iphdr *iph; |
9b4437a5 | 181 | __be32 addr; |
9fc47545 | 182 | |
8ed66f0e | 183 | iph = ip_hdr(skb); /* outer IP header... */ |
371bd106 | 184 | |
8ed66f0e JL |
185 | if (gs->collect_md) { |
186 | vni = zero_vni; | |
187 | addr = 0; | |
188 | } else { | |
9fc47545 | 189 | vni = geneve_hdr(skb)->vni; |
8ed66f0e JL |
190 | addr = iph->saddr; |
191 | } | |
192 | ||
9fc47545 | 193 | return geneve_lookup(gs, addr, vni); |
8ed66f0e | 194 | #if IS_ENABLED(CONFIG_IPV6) |
1e9f12ec | 195 | } else if (geneve_get_sk_family(gs) == AF_INET6) { |
9b4437a5 | 196 | static struct in6_addr zero_addr6; |
9fc47545 JB |
197 | struct ipv6hdr *ip6h; |
198 | struct in6_addr addr6; | |
199 | ||
8ed66f0e | 200 | ip6h = ipv6_hdr(skb); /* outer IPv6 header... */ |
371bd106 | 201 | |
8ed66f0e JL |
202 | if (gs->collect_md) { |
203 | vni = zero_vni; | |
204 | addr6 = zero_addr6; | |
205 | } else { | |
9fc47545 | 206 | vni = geneve_hdr(skb)->vni; |
8ed66f0e JL |
207 | addr6 = ip6h->saddr; |
208 | } | |
209 | ||
9fc47545 | 210 | return geneve6_lookup(gs, addr6, vni); |
8ed66f0e JL |
211 | #endif |
212 | } | |
9fc47545 JB |
213 | return NULL; |
214 | } | |
215 | ||
216 | /* geneve receive/decap routine */ | |
217 | static void geneve_rx(struct geneve_dev *geneve, struct geneve_sock *gs, | |
218 | struct sk_buff *skb) | |
219 | { | |
220 | struct genevehdr *gnvh = geneve_hdr(skb); | |
221 | struct metadata_dst *tun_dst = NULL; | |
222 | struct pcpu_sw_netstats *stats; | |
fe741e23 | 223 | unsigned int len; |
9fc47545 JB |
224 | int err = 0; |
225 | void *oiph; | |
2d07dc79 | 226 | |
371bd106 | 227 | if (ip_tunnel_collect_metadata() || gs->collect_md) { |
e305ac6c | 228 | __be16 flags; |
e305ac6c PS |
229 | |
230 | flags = TUNNEL_KEY | TUNNEL_GENEVE_OPT | | |
231 | (gnvh->oam ? TUNNEL_OAM : 0) | | |
232 | (gnvh->critical ? TUNNEL_CRIT_OPT : 0); | |
233 | ||
1e9f12ec | 234 | tun_dst = udp_tun_rx_dst(skb, geneve_get_sk_family(gs), flags, |
e305ac6c PS |
235 | vni_to_tunnel_id(gnvh->vni), |
236 | gnvh->opt_len * 4); | |
fe741e23 GM |
237 | if (!tun_dst) { |
238 | geneve->dev->stats.rx_dropped++; | |
e305ac6c | 239 | goto drop; |
fe741e23 | 240 | } |
e305ac6c | 241 | /* Update tunnel dst according to Geneve options. */ |
4c222798 PS |
242 | ip_tunnel_info_opts_set(&tun_dst->u.tun_info, |
243 | gnvh->options, gnvh->opt_len * 4); | |
e305ac6c PS |
244 | } else { |
245 | /* Drop packets w/ critical options, | |
246 | * since we don't support any... | |
247 | */ | |
fe741e23 GM |
248 | if (gnvh->critical) { |
249 | geneve->dev->stats.rx_frame_errors++; | |
250 | geneve->dev->stats.rx_errors++; | |
e305ac6c | 251 | goto drop; |
fe741e23 | 252 | } |
e305ac6c | 253 | } |
2d07dc79 JL |
254 | |
255 | skb_reset_mac_header(skb); | |
2d07dc79 JL |
256 | skb->protocol = eth_type_trans(skb, geneve->dev); |
257 | skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); | |
258 | ||
e305ac6c PS |
259 | if (tun_dst) |
260 | skb_dst_set(skb, &tun_dst->dst); | |
261 | ||
2d07dc79 | 262 | /* Ignore packet loops (and multicast echo) */ |
fe741e23 GM |
263 | if (ether_addr_equal(eth_hdr(skb)->h_source, geneve->dev->dev_addr)) { |
264 | geneve->dev->stats.rx_errors++; | |
2d07dc79 | 265 | goto drop; |
fe741e23 | 266 | } |
2d07dc79 | 267 | |
9fc47545 | 268 | oiph = skb_network_header(skb); |
2d07dc79 JL |
269 | skb_reset_network_header(skb); |
270 | ||
9fc47545 JB |
271 | if (geneve_get_sk_family(gs) == AF_INET) |
272 | err = IP_ECN_decapsulate(oiph, skb); | |
8ed66f0e | 273 | #if IS_ENABLED(CONFIG_IPV6) |
9fc47545 JB |
274 | else |
275 | err = IP6_ECN_decapsulate(oiph, skb); | |
8ed66f0e | 276 | #endif |
2d07dc79 JL |
277 | |
278 | if (unlikely(err)) { | |
8ed66f0e | 279 | if (log_ecn_error) { |
9fc47545 | 280 | if (geneve_get_sk_family(gs) == AF_INET) |
8ed66f0e JL |
281 | net_info_ratelimited("non-ECT from %pI4 " |
282 | "with TOS=%#x\n", | |
9fc47545 JB |
283 | &((struct iphdr *)oiph)->saddr, |
284 | ((struct iphdr *)oiph)->tos); | |
8ed66f0e | 285 | #if IS_ENABLED(CONFIG_IPV6) |
9fc47545 | 286 | else |
8ed66f0e | 287 | net_info_ratelimited("non-ECT from %pI6\n", |
9fc47545 | 288 | &((struct ipv6hdr *)oiph)->saddr); |
8ed66f0e JL |
289 | #endif |
290 | } | |
2d07dc79 JL |
291 | if (err > 1) { |
292 | ++geneve->dev->stats.rx_frame_errors; | |
293 | ++geneve->dev->stats.rx_errors; | |
294 | goto drop; | |
295 | } | |
296 | } | |
297 | ||
fe741e23 GM |
298 | len = skb->len; |
299 | err = gro_cells_receive(&geneve->gro_cells, skb); | |
300 | if (likely(err == NET_RX_SUCCESS)) { | |
301 | stats = this_cpu_ptr(geneve->dev->tstats); | |
302 | u64_stats_update_begin(&stats->syncp); | |
303 | stats->rx_packets++; | |
304 | stats->rx_bytes += len; | |
305 | u64_stats_update_end(&stats->syncp); | |
306 | } | |
2d07dc79 JL |
307 | return; |
308 | drop: | |
309 | /* Consume bad packet */ | |
310 | kfree_skb(skb); | |
311 | } | |
312 | ||
313 | /* Setup stats when device is created */ | |
314 | static int geneve_init(struct net_device *dev) | |
315 | { | |
8e816df8 JG |
316 | struct geneve_dev *geneve = netdev_priv(dev); |
317 | int err; | |
318 | ||
2d07dc79 JL |
319 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
320 | if (!dev->tstats) | |
321 | return -ENOMEM; | |
8e816df8 JG |
322 | |
323 | err = gro_cells_init(&geneve->gro_cells, dev); | |
324 | if (err) { | |
325 | free_percpu(dev->tstats); | |
326 | return err; | |
327 | } | |
328 | ||
9b4437a5 | 329 | err = dst_cache_init(&geneve->info.dst_cache, GFP_KERNEL); |
468dfffc PA |
330 | if (err) { |
331 | free_percpu(dev->tstats); | |
332 | gro_cells_destroy(&geneve->gro_cells); | |
333 | return err; | |
334 | } | |
2d07dc79 JL |
335 | return 0; |
336 | } | |
337 | ||
338 | static void geneve_uninit(struct net_device *dev) | |
339 | { | |
8e816df8 JG |
340 | struct geneve_dev *geneve = netdev_priv(dev); |
341 | ||
9b4437a5 | 342 | dst_cache_destroy(&geneve->info.dst_cache); |
8e816df8 | 343 | gro_cells_destroy(&geneve->gro_cells); |
2d07dc79 JL |
344 | free_percpu(dev->tstats); |
345 | } | |
346 | ||
371bd106 PS |
347 | /* Callback from net/ipv4/udp.c to receive packets */ |
348 | static int geneve_udp_encap_recv(struct sock *sk, struct sk_buff *skb) | |
349 | { | |
350 | struct genevehdr *geneveh; | |
9fc47545 | 351 | struct geneve_dev *geneve; |
371bd106 PS |
352 | struct geneve_sock *gs; |
353 | int opts_len; | |
354 | ||
fe741e23 | 355 | /* Need UDP and Geneve header to be present */ |
371bd106 | 356 | if (unlikely(!pskb_may_pull(skb, GENEVE_BASE_HLEN))) |
e5aed006 | 357 | goto drop; |
371bd106 PS |
358 | |
359 | /* Return packets with reserved bits set */ | |
360 | geneveh = geneve_hdr(skb); | |
361 | if (unlikely(geneveh->ver != GENEVE_VER)) | |
e5aed006 | 362 | goto drop; |
371bd106 PS |
363 | |
364 | if (unlikely(geneveh->proto_type != htons(ETH_P_TEB))) | |
e5aed006 | 365 | goto drop; |
371bd106 | 366 | |
9fc47545 JB |
367 | gs = rcu_dereference_sk_user_data(sk); |
368 | if (!gs) | |
369 | goto drop; | |
370 | ||
371 | geneve = geneve_lookup_skb(gs, skb); | |
372 | if (!geneve) | |
373 | goto drop; | |
374 | ||
371bd106 PS |
375 | opts_len = geneveh->opt_len * 4; |
376 | if (iptunnel_pull_header(skb, GENEVE_BASE_HLEN + opts_len, | |
7f290c94 | 377 | htons(ETH_P_TEB), |
fe741e23 GM |
378 | !net_eq(geneve->net, dev_net(geneve->dev)))) { |
379 | geneve->dev->stats.rx_dropped++; | |
371bd106 | 380 | goto drop; |
fe741e23 | 381 | } |
371bd106 | 382 | |
9fc47545 | 383 | geneve_rx(geneve, gs, skb); |
371bd106 PS |
384 | return 0; |
385 | ||
386 | drop: | |
387 | /* Consume bad packet */ | |
388 | kfree_skb(skb); | |
389 | return 0; | |
371bd106 PS |
390 | } |
391 | ||
392 | static struct socket *geneve_create_sock(struct net *net, bool ipv6, | |
9b4437a5 | 393 | __be16 port, bool ipv6_rx_csum) |
371bd106 PS |
394 | { |
395 | struct socket *sock; | |
396 | struct udp_port_cfg udp_conf; | |
397 | int err; | |
398 | ||
399 | memset(&udp_conf, 0, sizeof(udp_conf)); | |
400 | ||
401 | if (ipv6) { | |
402 | udp_conf.family = AF_INET6; | |
8ed66f0e | 403 | udp_conf.ipv6_v6only = 1; |
9b4437a5 | 404 | udp_conf.use_udp6_rx_checksums = ipv6_rx_csum; |
371bd106 PS |
405 | } else { |
406 | udp_conf.family = AF_INET; | |
407 | udp_conf.local_ip.s_addr = htonl(INADDR_ANY); | |
408 | } | |
409 | ||
410 | udp_conf.local_udp_port = port; | |
411 | ||
412 | /* Open UDP socket */ | |
413 | err = udp_sock_create(net, &udp_conf, &sock); | |
414 | if (err < 0) | |
415 | return ERR_PTR(err); | |
416 | ||
417 | return sock; | |
418 | } | |
419 | ||
371bd106 PS |
420 | static int geneve_hlen(struct genevehdr *gh) |
421 | { | |
422 | return sizeof(*gh) + gh->opt_len * 4; | |
423 | } | |
424 | ||
4a0090a9 TH |
425 | static struct sk_buff **geneve_gro_receive(struct sock *sk, |
426 | struct sk_buff **head, | |
427 | struct sk_buff *skb) | |
371bd106 PS |
428 | { |
429 | struct sk_buff *p, **pp = NULL; | |
430 | struct genevehdr *gh, *gh2; | |
431 | unsigned int hlen, gh_len, off_gnv; | |
432 | const struct packet_offload *ptype; | |
433 | __be16 type; | |
434 | int flush = 1; | |
435 | ||
436 | off_gnv = skb_gro_offset(skb); | |
437 | hlen = off_gnv + sizeof(*gh); | |
438 | gh = skb_gro_header_fast(skb, off_gnv); | |
439 | if (skb_gro_header_hard(skb, hlen)) { | |
440 | gh = skb_gro_header_slow(skb, hlen, off_gnv); | |
441 | if (unlikely(!gh)) | |
442 | goto out; | |
443 | } | |
444 | ||
445 | if (gh->ver != GENEVE_VER || gh->oam) | |
446 | goto out; | |
447 | gh_len = geneve_hlen(gh); | |
448 | ||
449 | hlen = off_gnv + gh_len; | |
450 | if (skb_gro_header_hard(skb, hlen)) { | |
451 | gh = skb_gro_header_slow(skb, hlen, off_gnv); | |
452 | if (unlikely(!gh)) | |
453 | goto out; | |
454 | } | |
455 | ||
371bd106 PS |
456 | for (p = *head; p; p = p->next) { |
457 | if (!NAPI_GRO_CB(p)->same_flow) | |
458 | continue; | |
459 | ||
460 | gh2 = (struct genevehdr *)(p->data + off_gnv); | |
461 | if (gh->opt_len != gh2->opt_len || | |
462 | memcmp(gh, gh2, gh_len)) { | |
463 | NAPI_GRO_CB(p)->same_flow = 0; | |
464 | continue; | |
465 | } | |
466 | } | |
467 | ||
468 | type = gh->proto_type; | |
469 | ||
470 | rcu_read_lock(); | |
471 | ptype = gro_find_receive_by_type(type); | |
c194cf93 | 472 | if (!ptype) |
371bd106 | 473 | goto out_unlock; |
371bd106 PS |
474 | |
475 | skb_gro_pull(skb, gh_len); | |
476 | skb_gro_postpull_rcsum(skb, gh, gh_len); | |
fcd91dd4 | 477 | pp = call_gro_receive(ptype->callbacks.gro_receive, head, skb); |
c194cf93 | 478 | flush = 0; |
371bd106 PS |
479 | |
480 | out_unlock: | |
481 | rcu_read_unlock(); | |
482 | out: | |
483 | NAPI_GRO_CB(skb)->flush |= flush; | |
484 | ||
485 | return pp; | |
486 | } | |
487 | ||
4a0090a9 TH |
488 | static int geneve_gro_complete(struct sock *sk, struct sk_buff *skb, |
489 | int nhoff) | |
371bd106 PS |
490 | { |
491 | struct genevehdr *gh; | |
492 | struct packet_offload *ptype; | |
493 | __be16 type; | |
494 | int gh_len; | |
495 | int err = -ENOSYS; | |
496 | ||
371bd106 PS |
497 | gh = (struct genevehdr *)(skb->data + nhoff); |
498 | gh_len = geneve_hlen(gh); | |
499 | type = gh->proto_type; | |
500 | ||
501 | rcu_read_lock(); | |
502 | ptype = gro_find_complete_by_type(type); | |
503 | if (ptype) | |
504 | err = ptype->callbacks.gro_complete(skb, nhoff + gh_len); | |
505 | ||
506 | rcu_read_unlock(); | |
229740c6 JR |
507 | |
508 | skb_set_inner_mac_header(skb, nhoff + gh_len); | |
509 | ||
371bd106 PS |
510 | return err; |
511 | } | |
512 | ||
513 | /* Create new listen socket if needed */ | |
514 | static struct geneve_sock *geneve_socket_create(struct net *net, __be16 port, | |
9b4437a5 | 515 | bool ipv6, bool ipv6_rx_csum) |
371bd106 PS |
516 | { |
517 | struct geneve_net *gn = net_generic(net, geneve_net_id); | |
518 | struct geneve_sock *gs; | |
519 | struct socket *sock; | |
520 | struct udp_tunnel_sock_cfg tunnel_cfg; | |
66d47003 | 521 | int h; |
371bd106 PS |
522 | |
523 | gs = kzalloc(sizeof(*gs), GFP_KERNEL); | |
524 | if (!gs) | |
525 | return ERR_PTR(-ENOMEM); | |
526 | ||
9b4437a5 | 527 | sock = geneve_create_sock(net, ipv6, port, ipv6_rx_csum); |
371bd106 PS |
528 | if (IS_ERR(sock)) { |
529 | kfree(gs); | |
530 | return ERR_CAST(sock); | |
531 | } | |
532 | ||
533 | gs->sock = sock; | |
534 | gs->refcnt = 1; | |
66d47003 PS |
535 | for (h = 0; h < VNI_HASH_SIZE; ++h) |
536 | INIT_HLIST_HEAD(&gs->vni_list[h]); | |
371bd106 PS |
537 | |
538 | /* Initialize the geneve udp offloads structure */ | |
e7b3db5e | 539 | udp_tunnel_notify_add_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); |
371bd106 PS |
540 | |
541 | /* Mark socket as an encapsulation socket */ | |
4a0090a9 | 542 | memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); |
371bd106 PS |
543 | tunnel_cfg.sk_user_data = gs; |
544 | tunnel_cfg.encap_type = 1; | |
4a0090a9 TH |
545 | tunnel_cfg.gro_receive = geneve_gro_receive; |
546 | tunnel_cfg.gro_complete = geneve_gro_complete; | |
371bd106 PS |
547 | tunnel_cfg.encap_rcv = geneve_udp_encap_recv; |
548 | tunnel_cfg.encap_destroy = NULL; | |
549 | setup_udp_tunnel_sock(net, sock, &tunnel_cfg); | |
371bd106 PS |
550 | list_add(&gs->list, &gn->sock_list); |
551 | return gs; | |
552 | } | |
553 | ||
8ed66f0e | 554 | static void __geneve_sock_release(struct geneve_sock *gs) |
371bd106 | 555 | { |
8ed66f0e | 556 | if (!gs || --gs->refcnt) |
371bd106 PS |
557 | return; |
558 | ||
559 | list_del(&gs->list); | |
e7b3db5e | 560 | udp_tunnel_notify_del_rx_port(gs->sock, UDP_TUNNEL_TYPE_GENEVE); |
371bd106 PS |
561 | udp_tunnel_sock_release(gs->sock); |
562 | kfree_rcu(gs, rcu); | |
563 | } | |
564 | ||
8ed66f0e JL |
565 | static void geneve_sock_release(struct geneve_dev *geneve) |
566 | { | |
fceb9c3e | 567 | struct geneve_sock *gs4 = rtnl_dereference(geneve->sock4); |
8ed66f0e | 568 | #if IS_ENABLED(CONFIG_IPV6) |
fceb9c3e | 569 | struct geneve_sock *gs6 = rtnl_dereference(geneve->sock6); |
570 | ||
571 | rcu_assign_pointer(geneve->sock6, NULL); | |
572 | #endif | |
573 | ||
574 | rcu_assign_pointer(geneve->sock4, NULL); | |
575 | synchronize_net(); | |
576 | ||
577 | __geneve_sock_release(gs4); | |
578 | #if IS_ENABLED(CONFIG_IPV6) | |
579 | __geneve_sock_release(gs6); | |
8ed66f0e JL |
580 | #endif |
581 | } | |
582 | ||
371bd106 | 583 | static struct geneve_sock *geneve_find_sock(struct geneve_net *gn, |
8ed66f0e | 584 | sa_family_t family, |
371bd106 PS |
585 | __be16 dst_port) |
586 | { | |
587 | struct geneve_sock *gs; | |
588 | ||
589 | list_for_each_entry(gs, &gn->sock_list, list) { | |
590 | if (inet_sk(gs->sock->sk)->inet_sport == dst_port && | |
1e9f12ec | 591 | geneve_get_sk_family(gs) == family) { |
371bd106 PS |
592 | return gs; |
593 | } | |
594 | } | |
595 | return NULL; | |
596 | } | |
597 | ||
8ed66f0e | 598 | static int geneve_sock_add(struct geneve_dev *geneve, bool ipv6) |
2d07dc79 | 599 | { |
2d07dc79 | 600 | struct net *net = geneve->net; |
371bd106 | 601 | struct geneve_net *gn = net_generic(net, geneve_net_id); |
4b4c21fa | 602 | struct geneve_dev_node *node; |
2d07dc79 | 603 | struct geneve_sock *gs; |
9b4437a5 | 604 | __u8 vni[3]; |
66d47003 | 605 | __u32 hash; |
2d07dc79 | 606 | |
9b4437a5 | 607 | gs = geneve_find_sock(gn, ipv6 ? AF_INET6 : AF_INET, geneve->info.key.tp_dst); |
371bd106 PS |
608 | if (gs) { |
609 | gs->refcnt++; | |
610 | goto out; | |
611 | } | |
612 | ||
9b4437a5 | 613 | gs = geneve_socket_create(net, geneve->info.key.tp_dst, ipv6, |
614 | geneve->use_udp6_rx_checksums); | |
2d07dc79 JL |
615 | if (IS_ERR(gs)) |
616 | return PTR_ERR(gs); | |
617 | ||
371bd106 PS |
618 | out: |
619 | gs->collect_md = geneve->collect_md; | |
8ed66f0e | 620 | #if IS_ENABLED(CONFIG_IPV6) |
4b4c21fa | 621 | if (ipv6) { |
fceb9c3e | 622 | rcu_assign_pointer(geneve->sock6, gs); |
4b4c21fa JB |
623 | node = &geneve->hlist6; |
624 | } else | |
8ed66f0e | 625 | #endif |
4b4c21fa | 626 | { |
fceb9c3e | 627 | rcu_assign_pointer(geneve->sock4, gs); |
4b4c21fa JB |
628 | node = &geneve->hlist4; |
629 | } | |
630 | node->geneve = geneve; | |
66d47003 | 631 | |
9b4437a5 | 632 | tunnel_id_to_vni(geneve->info.key.tun_id, vni); |
633 | hash = geneve_net_vni_hash(vni); | |
4b4c21fa | 634 | hlist_add_head_rcu(&node->hlist, &gs->vni_list[hash]); |
2d07dc79 JL |
635 | return 0; |
636 | } | |
637 | ||
8ed66f0e JL |
638 | static int geneve_open(struct net_device *dev) |
639 | { | |
640 | struct geneve_dev *geneve = netdev_priv(dev); | |
9b4437a5 | 641 | bool ipv6 = !!(geneve->info.mode & IP_TUNNEL_INFO_IPV6); |
8ed66f0e JL |
642 | bool metadata = geneve->collect_md; |
643 | int ret = 0; | |
644 | ||
8ed66f0e | 645 | #if IS_ENABLED(CONFIG_IPV6) |
8ed66f0e JL |
646 | if (ipv6 || metadata) |
647 | ret = geneve_sock_add(geneve, true); | |
648 | #endif | |
649 | if (!ret && (!ipv6 || metadata)) | |
650 | ret = geneve_sock_add(geneve, false); | |
651 | if (ret < 0) | |
652 | geneve_sock_release(geneve); | |
653 | ||
654 | return ret; | |
655 | } | |
656 | ||
2d07dc79 JL |
657 | static int geneve_stop(struct net_device *dev) |
658 | { | |
659 | struct geneve_dev *geneve = netdev_priv(dev); | |
2d07dc79 | 660 | |
4b4c21fa JB |
661 | hlist_del_init_rcu(&geneve->hlist4.hlist); |
662 | #if IS_ENABLED(CONFIG_IPV6) | |
663 | hlist_del_init_rcu(&geneve->hlist6.hlist); | |
664 | #endif | |
8ed66f0e | 665 | geneve_sock_release(geneve); |
371bd106 PS |
666 | return 0; |
667 | } | |
668 | ||
8ed66f0e | 669 | static void geneve_build_header(struct genevehdr *geneveh, |
c3ef5aa5 | 670 | const struct ip_tunnel_info *info) |
8ed66f0e JL |
671 | { |
672 | geneveh->ver = GENEVE_VER; | |
c3ef5aa5 | 673 | geneveh->opt_len = info->options_len / 4; |
674 | geneveh->oam = !!(info->key.tun_flags & TUNNEL_OAM); | |
675 | geneveh->critical = !!(info->key.tun_flags & TUNNEL_CRIT_OPT); | |
8ed66f0e | 676 | geneveh->rsvd1 = 0; |
c3ef5aa5 | 677 | tunnel_id_to_vni(info->key.tun_id, geneveh->vni); |
8ed66f0e JL |
678 | geneveh->proto_type = htons(ETH_P_TEB); |
679 | geneveh->rsvd2 = 0; | |
680 | ||
c3ef5aa5 | 681 | ip_tunnel_info_opts_get(geneveh->options, info); |
8ed66f0e JL |
682 | } |
683 | ||
c3ef5aa5 | 684 | static int geneve_build_skb(struct dst_entry *dst, struct sk_buff *skb, |
685 | const struct ip_tunnel_info *info, | |
686 | bool xnet, int ip_hdr_len) | |
371bd106 | 687 | { |
c3ef5aa5 | 688 | bool udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM); |
8ed66f0e JL |
689 | struct genevehdr *gnvh; |
690 | int min_headroom; | |
691 | int err; | |
692 | ||
c3ef5aa5 | 693 | skb_reset_mac_header(skb); |
8ed66f0e JL |
694 | skb_scrub_packet(skb, xnet); |
695 | ||
c3ef5aa5 | 696 | min_headroom = LL_RESERVED_SPACE(dst->dev) + dst->header_len + |
697 | GENEVE_BASE_HLEN + info->options_len + ip_hdr_len; | |
8ed66f0e | 698 | err = skb_cow_head(skb, min_headroom); |
aed069df | 699 | if (unlikely(err)) |
8ed66f0e | 700 | goto free_dst; |
8ed66f0e | 701 | |
aed069df | 702 | err = udp_tunnel_handle_offloads(skb, udp_sum); |
1ba64fac | 703 | if (err) |
8ed66f0e | 704 | goto free_dst; |
8ed66f0e | 705 | |
d58ff351 | 706 | gnvh = __skb_push(skb, sizeof(*gnvh) + info->options_len); |
c3ef5aa5 | 707 | geneve_build_header(gnvh, info); |
8ed66f0e JL |
708 | skb_set_inner_protocol(skb, htons(ETH_P_TEB)); |
709 | return 0; | |
710 | ||
711 | free_dst: | |
712 | dst_release(dst); | |
713 | return err; | |
714 | } | |
8ed66f0e JL |
715 | |
716 | static struct rtable *geneve_get_v4_rt(struct sk_buff *skb, | |
717 | struct net_device *dev, | |
5b861f6b | 718 | struct geneve_sock *gs4, |
8ed66f0e | 719 | struct flowi4 *fl4, |
c3ef5aa5 | 720 | const struct ip_tunnel_info *info) |
e305ac6c | 721 | { |
db3c6139 | 722 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); |
e305ac6c | 723 | struct geneve_dev *geneve = netdev_priv(dev); |
468dfffc | 724 | struct dst_cache *dst_cache; |
e305ac6c PS |
725 | struct rtable *rt = NULL; |
726 | __u8 tos; | |
727 | ||
5b861f6b | 728 | if (!gs4) |
fceb9c3e | 729 | return ERR_PTR(-EIO); |
730 | ||
e305ac6c PS |
731 | memset(fl4, 0, sizeof(*fl4)); |
732 | fl4->flowi4_mark = skb->mark; | |
733 | fl4->flowi4_proto = IPPROTO_UDP; | |
9b4437a5 | 734 | fl4->daddr = info->key.u.ipv4.dst; |
735 | fl4->saddr = info->key.u.ipv4.src; | |
e305ac6c | 736 | |
9b4437a5 | 737 | tos = info->key.tos; |
738 | if ((tos == 1) && !geneve->collect_md) { | |
739 | tos = ip_tunnel_get_dsfield(ip_hdr(skb), skb); | |
740 | use_cache = false; | |
468dfffc | 741 | } |
9b4437a5 | 742 | fl4->flowi4_tos = RT_TOS(tos); |
468dfffc | 743 | |
c3ef5aa5 | 744 | dst_cache = (struct dst_cache *)&info->dst_cache; |
468dfffc PA |
745 | if (use_cache) { |
746 | rt = dst_cache_get_ip4(dst_cache, &fl4->saddr); | |
747 | if (rt) | |
748 | return rt; | |
e305ac6c | 749 | } |
e305ac6c PS |
750 | rt = ip_route_output_key(geneve->net, fl4); |
751 | if (IS_ERR(rt)) { | |
752 | netdev_dbg(dev, "no route to %pI4\n", &fl4->daddr); | |
fc4099f1 | 753 | return ERR_PTR(-ENETUNREACH); |
e305ac6c PS |
754 | } |
755 | if (rt->dst.dev == dev) { /* is this necessary? */ | |
756 | netdev_dbg(dev, "circular route to %pI4\n", &fl4->daddr); | |
e305ac6c | 757 | ip_rt_put(rt); |
fc4099f1 | 758 | return ERR_PTR(-ELOOP); |
e305ac6c | 759 | } |
468dfffc PA |
760 | if (use_cache) |
761 | dst_cache_set_ip4(dst_cache, &rt->dst, fl4->saddr); | |
e305ac6c PS |
762 | return rt; |
763 | } | |
764 | ||
8ed66f0e JL |
765 | #if IS_ENABLED(CONFIG_IPV6) |
766 | static struct dst_entry *geneve_get_v6_dst(struct sk_buff *skb, | |
767 | struct net_device *dev, | |
5b861f6b | 768 | struct geneve_sock *gs6, |
8ed66f0e | 769 | struct flowi6 *fl6, |
c3ef5aa5 | 770 | const struct ip_tunnel_info *info) |
8ed66f0e | 771 | { |
db3c6139 | 772 | bool use_cache = ip_tunnel_dst_cache_usable(skb, info); |
8ed66f0e | 773 | struct geneve_dev *geneve = netdev_priv(dev); |
8ed66f0e | 774 | struct dst_entry *dst = NULL; |
468dfffc | 775 | struct dst_cache *dst_cache; |
3a56f86f | 776 | __u8 prio; |
8ed66f0e | 777 | |
fceb9c3e | 778 | if (!gs6) |
779 | return ERR_PTR(-EIO); | |
780 | ||
8ed66f0e JL |
781 | memset(fl6, 0, sizeof(*fl6)); |
782 | fl6->flowi6_mark = skb->mark; | |
783 | fl6->flowi6_proto = IPPROTO_UDP; | |
9b4437a5 | 784 | fl6->daddr = info->key.u.ipv6.dst; |
785 | fl6->saddr = info->key.u.ipv6.src; | |
786 | prio = info->key.tos; | |
787 | if ((prio == 1) && !geneve->collect_md) { | |
788 | prio = ip_tunnel_get_dsfield(ip_hdr(skb), skb); | |
789 | use_cache = false; | |
468dfffc PA |
790 | } |
791 | ||
9b4437a5 | 792 | fl6->flowlabel = ip6_make_flowinfo(RT_TOS(prio), |
793 | info->key.label); | |
c3ef5aa5 | 794 | dst_cache = (struct dst_cache *)&info->dst_cache; |
468dfffc PA |
795 | if (use_cache) { |
796 | dst = dst_cache_get_ip6(dst_cache, &fl6->saddr); | |
797 | if (dst) | |
798 | return dst; | |
8ed66f0e | 799 | } |
8ed66f0e JL |
800 | if (ipv6_stub->ipv6_dst_lookup(geneve->net, gs6->sock->sk, &dst, fl6)) { |
801 | netdev_dbg(dev, "no route to %pI6\n", &fl6->daddr); | |
802 | return ERR_PTR(-ENETUNREACH); | |
803 | } | |
804 | if (dst->dev == dev) { /* is this necessary? */ | |
805 | netdev_dbg(dev, "circular route to %pI6\n", &fl6->daddr); | |
806 | dst_release(dst); | |
807 | return ERR_PTR(-ELOOP); | |
808 | } | |
809 | ||
468dfffc PA |
810 | if (use_cache) |
811 | dst_cache_set_ip6(dst_cache, dst, &fl6->saddr); | |
8ed66f0e JL |
812 | return dst; |
813 | } | |
814 | #endif | |
815 | ||
9b4437a5 | 816 | static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
c3ef5aa5 | 817 | struct geneve_dev *geneve, |
818 | const struct ip_tunnel_info *info) | |
2d07dc79 | 819 | { |
9b4437a5 | 820 | bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); |
821 | struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); | |
822 | const struct ip_tunnel_key *key = &info->key; | |
823 | struct rtable *rt; | |
2d07dc79 | 824 | struct flowi4 fl4; |
8760ce58 | 825 | __u8 tos, ttl; |
e305ac6c | 826 | __be16 sport; |
371bd106 | 827 | __be16 df; |
bcceeec3 | 828 | int err; |
980c394c | 829 | |
5b861f6b | 830 | rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); |
9b4437a5 | 831 | if (IS_ERR(rt)) |
832 | return PTR_ERR(rt); | |
371bd106 PS |
833 | |
834 | sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); | |
9b4437a5 | 835 | if (geneve->collect_md) { |
836 | tos = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); | |
371bd106 | 837 | ttl = key->ttl; |
e305ac6c | 838 | } else { |
9b4437a5 | 839 | tos = ip_tunnel_ecn_encap(fl4.flowi4_tos, ip_hdr(skb), skb); |
840 | ttl = key->ttl ? : ip4_dst_hoplimit(&rt->dst); | |
2d07dc79 | 841 | } |
9b4437a5 | 842 | df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0; |
2d07dc79 | 843 | |
c3ef5aa5 | 844 | err = geneve_build_skb(&rt->dst, skb, info, xnet, sizeof(struct iphdr)); |
9b4437a5 | 845 | if (unlikely(err)) |
846 | return err; | |
efeb2267 | 847 | |
9b4437a5 | 848 | udp_tunnel_xmit_skb(rt, gs4->sock->sk, skb, fl4.saddr, fl4.daddr, |
849 | tos, ttl, df, sport, geneve->info.key.tp_dst, | |
850 | !net_eq(geneve->net, dev_net(geneve->dev)), | |
851 | !(info->key.tun_flags & TUNNEL_CSUM)); | |
852 | return 0; | |
2d07dc79 JL |
853 | } |
854 | ||
8ed66f0e | 855 | #if IS_ENABLED(CONFIG_IPV6) |
9b4437a5 | 856 | static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev, |
c3ef5aa5 | 857 | struct geneve_dev *geneve, |
858 | const struct ip_tunnel_info *info) | |
8ed66f0e | 859 | { |
9b4437a5 | 860 | bool xnet = !net_eq(geneve->net, dev_net(geneve->dev)); |
861 | struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); | |
862 | const struct ip_tunnel_key *key = &info->key; | |
8ed66f0e | 863 | struct dst_entry *dst = NULL; |
8ed66f0e | 864 | struct flowi6 fl6; |
3a56f86f | 865 | __u8 prio, ttl; |
8ed66f0e | 866 | __be16 sport; |
bcceeec3 | 867 | int err; |
8ed66f0e | 868 | |
5b861f6b | 869 | dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); |
9b4437a5 | 870 | if (IS_ERR(dst)) |
871 | return PTR_ERR(dst); | |
8ed66f0e JL |
872 | |
873 | sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true); | |
9b4437a5 | 874 | if (geneve->collect_md) { |
875 | prio = ip_tunnel_ecn_encap(key->tos, ip_hdr(skb), skb); | |
876 | ttl = key->ttl; | |
877 | } else { | |
878 | prio = ip_tunnel_ecn_encap(ip6_tclass(fl6.flowlabel), | |
879 | ip_hdr(skb), skb); | |
880 | ttl = key->ttl ? : ip6_dst_hoplimit(dst); | |
881 | } | |
31ac1c19 | 882 | err = geneve_build_skb(dst, skb, info, xnet, sizeof(struct ipv6hdr)); |
9b4437a5 | 883 | if (unlikely(err)) |
884 | return err; | |
8ed66f0e | 885 | |
9b4437a5 | 886 | udp_tunnel6_xmit_skb(dst, gs6->sock->sk, skb, dev, |
887 | &fl6.saddr, &fl6.daddr, prio, ttl, | |
888 | info->key.label, sport, geneve->info.key.tp_dst, | |
889 | !(info->key.tun_flags & TUNNEL_CSUM)); | |
890 | return 0; | |
891 | } | |
892 | #endif | |
8ed66f0e | 893 | |
9b4437a5 | 894 | static netdev_tx_t geneve_xmit(struct sk_buff *skb, struct net_device *dev) |
895 | { | |
896 | struct geneve_dev *geneve = netdev_priv(dev); | |
897 | struct ip_tunnel_info *info = NULL; | |
898 | int err; | |
abe492b4 | 899 | |
9b4437a5 | 900 | if (geneve->collect_md) { |
901 | info = skb_tunnel_info(skb); | |
902 | if (unlikely(!info || !(info->mode & IP_TUNNEL_INFO_TX))) { | |
903 | err = -EINVAL; | |
904 | netdev_dbg(dev, "no tunnel metadata\n"); | |
aed069df | 905 | goto tx_error; |
9b4437a5 | 906 | } |
8ed66f0e | 907 | } else { |
9b4437a5 | 908 | info = &geneve->info; |
8ed66f0e | 909 | } |
8eb3b995 | 910 | |
a717e3f7 | 911 | rcu_read_lock(); |
9b4437a5 | 912 | #if IS_ENABLED(CONFIG_IPV6) |
913 | if (info->mode & IP_TUNNEL_INFO_IPV6) | |
914 | err = geneve6_xmit_skb(skb, dev, geneve, info); | |
915 | else | |
916 | #endif | |
917 | err = geneve_xmit_skb(skb, dev, geneve, info); | |
a717e3f7 | 918 | rcu_read_unlock(); |
8ed66f0e | 919 | |
9b4437a5 | 920 | if (likely(!err)) |
921 | return NETDEV_TX_OK; | |
8ed66f0e JL |
922 | tx_error: |
923 | dev_kfree_skb(skb); | |
aed069df | 924 | |
8ed66f0e JL |
925 | if (err == -ELOOP) |
926 | dev->stats.collisions++; | |
927 | else if (err == -ENETUNREACH) | |
928 | dev->stats.tx_carrier_errors++; | |
efeb2267 HY |
929 | |
930 | dev->stats.tx_errors++; | |
8ed66f0e JL |
931 | return NETDEV_TX_OK; |
932 | } | |
8ed66f0e | 933 | |
91572088 | 934 | static int geneve_change_mtu(struct net_device *dev, int new_mtu) |
55e5bfb5 | 935 | { |
91572088 JW |
936 | /* Only possible if called internally, ndo_change_mtu path's new_mtu |
937 | * is guaranteed to be between dev->min_mtu and dev->max_mtu. | |
55e5bfb5 | 938 | */ |
91572088 JW |
939 | if (new_mtu > dev->max_mtu) |
940 | new_mtu = dev->max_mtu; | |
aeee0e66 | 941 | |
55e5bfb5 DW |
942 | dev->mtu = new_mtu; |
943 | return 0; | |
944 | } | |
945 | ||
fc4099f1 PS |
946 | static int geneve_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb) |
947 | { | |
948 | struct ip_tunnel_info *info = skb_tunnel_info(skb); | |
949 | struct geneve_dev *geneve = netdev_priv(dev); | |
fc4099f1 | 950 | |
b8812fa8 | 951 | if (ip_tunnel_info_af(info) == AF_INET) { |
9b4437a5 | 952 | struct rtable *rt; |
953 | struct flowi4 fl4; | |
5b861f6b | 954 | struct geneve_sock *gs4 = rcu_dereference(geneve->sock4); |
9b4437a5 | 955 | |
5b861f6b | 956 | rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info); |
b8812fa8 JL |
957 | if (IS_ERR(rt)) |
958 | return PTR_ERR(rt); | |
fc4099f1 | 959 | |
b8812fa8 JL |
960 | ip_rt_put(rt); |
961 | info->key.u.ipv4.src = fl4.saddr; | |
962 | #if IS_ENABLED(CONFIG_IPV6) | |
963 | } else if (ip_tunnel_info_af(info) == AF_INET6) { | |
9b4437a5 | 964 | struct dst_entry *dst; |
965 | struct flowi6 fl6; | |
5b861f6b | 966 | struct geneve_sock *gs6 = rcu_dereference(geneve->sock6); |
9b4437a5 | 967 | |
5b861f6b | 968 | dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info); |
b8812fa8 JL |
969 | if (IS_ERR(dst)) |
970 | return PTR_ERR(dst); | |
971 | ||
972 | dst_release(dst); | |
973 | info->key.u.ipv6.src = fl6.saddr; | |
974 | #endif | |
975 | } else { | |
976 | return -EINVAL; | |
977 | } | |
fc4099f1 | 978 | |
fc4099f1 PS |
979 | info->key.tp_src = udp_flow_src_port(geneve->net, skb, |
980 | 1, USHRT_MAX, true); | |
9b4437a5 | 981 | info->key.tp_dst = geneve->info.key.tp_dst; |
fc4099f1 PS |
982 | return 0; |
983 | } | |
984 | ||
2d07dc79 JL |
985 | static const struct net_device_ops geneve_netdev_ops = { |
986 | .ndo_init = geneve_init, | |
987 | .ndo_uninit = geneve_uninit, | |
988 | .ndo_open = geneve_open, | |
989 | .ndo_stop = geneve_stop, | |
990 | .ndo_start_xmit = geneve_xmit, | |
991 | .ndo_get_stats64 = ip_tunnel_get_stats64, | |
55e5bfb5 | 992 | .ndo_change_mtu = geneve_change_mtu, |
2d07dc79 JL |
993 | .ndo_validate_addr = eth_validate_addr, |
994 | .ndo_set_mac_address = eth_mac_addr, | |
fc4099f1 | 995 | .ndo_fill_metadata_dst = geneve_fill_metadata_dst, |
2d07dc79 JL |
996 | }; |
997 | ||
998 | static void geneve_get_drvinfo(struct net_device *dev, | |
999 | struct ethtool_drvinfo *drvinfo) | |
1000 | { | |
1001 | strlcpy(drvinfo->version, GENEVE_NETDEV_VER, sizeof(drvinfo->version)); | |
1002 | strlcpy(drvinfo->driver, "geneve", sizeof(drvinfo->driver)); | |
1003 | } | |
1004 | ||
1005 | static const struct ethtool_ops geneve_ethtool_ops = { | |
1006 | .get_drvinfo = geneve_get_drvinfo, | |
1007 | .get_link = ethtool_op_get_link, | |
1008 | }; | |
1009 | ||
1010 | /* Info for udev, that this is a virtual tunnel endpoint */ | |
1011 | static struct device_type geneve_type = { | |
1012 | .name = "geneve", | |
1013 | }; | |
1014 | ||
e5de25dc | 1015 | /* Calls the ndo_udp_tunnel_add of the caller in order to |
05ca4029 | 1016 | * supply the listening GENEVE udp ports. Callers are expected |
e5de25dc | 1017 | * to implement the ndo_udp_tunnel_add. |
05ca4029 | 1018 | */ |
2d2b13fc | 1019 | static void geneve_offload_rx_ports(struct net_device *dev, bool push) |
05ca4029 SA |
1020 | { |
1021 | struct net *net = dev_net(dev); | |
1022 | struct geneve_net *gn = net_generic(net, geneve_net_id); | |
1023 | struct geneve_sock *gs; | |
681e683f | 1024 | |
05ca4029 | 1025 | rcu_read_lock(); |
2d2b13fc SD |
1026 | list_for_each_entry_rcu(gs, &gn->sock_list, list) { |
1027 | if (push) { | |
1028 | udp_tunnel_push_rx_port(dev, gs->sock, | |
1029 | UDP_TUNNEL_TYPE_GENEVE); | |
1030 | } else { | |
1031 | udp_tunnel_drop_rx_port(dev, gs->sock, | |
1032 | UDP_TUNNEL_TYPE_GENEVE); | |
1033 | } | |
1034 | } | |
05ca4029 SA |
1035 | rcu_read_unlock(); |
1036 | } | |
05ca4029 | 1037 | |
2d07dc79 JL |
1038 | /* Initialize the device structure. */ |
1039 | static void geneve_setup(struct net_device *dev) | |
1040 | { | |
1041 | ether_setup(dev); | |
1042 | ||
1043 | dev->netdev_ops = &geneve_netdev_ops; | |
1044 | dev->ethtool_ops = &geneve_ethtool_ops; | |
cf124db5 | 1045 | dev->needs_free_netdev = true; |
2d07dc79 JL |
1046 | |
1047 | SET_NETDEV_DEVTYPE(dev, &geneve_type); | |
1048 | ||
2d07dc79 JL |
1049 | dev->features |= NETIF_F_LLTX; |
1050 | dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
1051 | dev->features |= NETIF_F_RXCSUM; | |
1052 | dev->features |= NETIF_F_GSO_SOFTWARE; | |
1053 | ||
2d07dc79 JL |
1054 | dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM; |
1055 | dev->hw_features |= NETIF_F_GSO_SOFTWARE; | |
2d07dc79 | 1056 | |
91572088 JW |
1057 | /* MTU range: 68 - (something less than 65535) */ |
1058 | dev->min_mtu = ETH_MIN_MTU; | |
1059 | /* The max_mtu calculation does not take account of GENEVE | |
1060 | * options, to avoid excluding potentially valid | |
1061 | * configurations. This will be further reduced by IPvX hdr size. | |
1062 | */ | |
1063 | dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; | |
1064 | ||
2d07dc79 | 1065 | netif_keep_dst(dev); |
fc41cdb3 | 1066 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
ed961ac2 | 1067 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; |
87cd3dca | 1068 | eth_hw_addr_random(dev); |
2d07dc79 JL |
1069 | } |
1070 | ||
1071 | static const struct nla_policy geneve_policy[IFLA_GENEVE_MAX + 1] = { | |
1072 | [IFLA_GENEVE_ID] = { .type = NLA_U32 }, | |
1073 | [IFLA_GENEVE_REMOTE] = { .len = FIELD_SIZEOF(struct iphdr, daddr) }, | |
8ed66f0e | 1074 | [IFLA_GENEVE_REMOTE6] = { .len = sizeof(struct in6_addr) }, |
8760ce58 | 1075 | [IFLA_GENEVE_TTL] = { .type = NLA_U8 }, |
d8951125 | 1076 | [IFLA_GENEVE_TOS] = { .type = NLA_U8 }, |
8eb3b995 | 1077 | [IFLA_GENEVE_LABEL] = { .type = NLA_U32 }, |
cd7918b3 | 1078 | [IFLA_GENEVE_PORT] = { .type = NLA_U16 }, |
e305ac6c | 1079 | [IFLA_GENEVE_COLLECT_METADATA] = { .type = NLA_FLAG }, |
abe492b4 TH |
1080 | [IFLA_GENEVE_UDP_CSUM] = { .type = NLA_U8 }, |
1081 | [IFLA_GENEVE_UDP_ZERO_CSUM6_TX] = { .type = NLA_U8 }, | |
1082 | [IFLA_GENEVE_UDP_ZERO_CSUM6_RX] = { .type = NLA_U8 }, | |
2d07dc79 JL |
1083 | }; |
1084 | ||
a8b8a889 MS |
1085 | static int geneve_validate(struct nlattr *tb[], struct nlattr *data[], |
1086 | struct netlink_ext_ack *extack) | |
2d07dc79 JL |
1087 | { |
1088 | if (tb[IFLA_ADDRESS]) { | |
c5ebc440 GM |
1089 | if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) { |
1090 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], | |
1091 | "Provided link layer address is not Ethernet"); | |
2d07dc79 | 1092 | return -EINVAL; |
c5ebc440 | 1093 | } |
2d07dc79 | 1094 | |
c5ebc440 GM |
1095 | if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) { |
1096 | NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_ADDRESS], | |
1097 | "Provided Ethernet address is not unicast"); | |
2d07dc79 | 1098 | return -EADDRNOTAVAIL; |
c5ebc440 | 1099 | } |
2d07dc79 JL |
1100 | } |
1101 | ||
c5ebc440 GM |
1102 | if (!data) { |
1103 | NL_SET_ERR_MSG(extack, | |
1104 | "Not enough attributes provided to perform the operation"); | |
2d07dc79 | 1105 | return -EINVAL; |
c5ebc440 | 1106 | } |
2d07dc79 JL |
1107 | |
1108 | if (data[IFLA_GENEVE_ID]) { | |
1109 | __u32 vni = nla_get_u32(data[IFLA_GENEVE_ID]); | |
1110 | ||
c5ebc440 GM |
1111 | if (vni >= GENEVE_N_VID) { |
1112 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_ID], | |
1113 | "Geneve ID must be lower than 16777216"); | |
2d07dc79 | 1114 | return -ERANGE; |
c5ebc440 | 1115 | } |
2d07dc79 JL |
1116 | } |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
371bd106 | 1121 | static struct geneve_dev *geneve_find_dev(struct geneve_net *gn, |
9b4437a5 | 1122 | const struct ip_tunnel_info *info, |
371bd106 PS |
1123 | bool *tun_on_same_port, |
1124 | bool *tun_collect_md) | |
1125 | { | |
9b4437a5 | 1126 | struct geneve_dev *geneve, *t = NULL; |
371bd106 PS |
1127 | |
1128 | *tun_on_same_port = false; | |
1129 | *tun_collect_md = false; | |
371bd106 | 1130 | list_for_each_entry(geneve, &gn->geneve_list, next) { |
9b4437a5 | 1131 | if (info->key.tp_dst == geneve->info.key.tp_dst) { |
371bd106 PS |
1132 | *tun_collect_md = geneve->collect_md; |
1133 | *tun_on_same_port = true; | |
1134 | } | |
9b4437a5 | 1135 | if (info->key.tun_id == geneve->info.key.tun_id && |
1136 | info->key.tp_dst == geneve->info.key.tp_dst && | |
1137 | !memcmp(&info->key.u, &geneve->info.key.u, sizeof(info->key.u))) | |
371bd106 PS |
1138 | t = geneve; |
1139 | } | |
1140 | return t; | |
1141 | } | |
1142 | ||
9b4437a5 | 1143 | static bool is_all_zero(const u8 *fp, size_t size) |
1144 | { | |
1145 | int i; | |
1146 | ||
1147 | for (i = 0; i < size; i++) | |
1148 | if (fp[i]) | |
1149 | return false; | |
1150 | return true; | |
1151 | } | |
1152 | ||
1153 | static bool is_tnl_info_zero(const struct ip_tunnel_info *info) | |
1154 | { | |
1155 | if (info->key.tun_id || info->key.tun_flags || info->key.tos || | |
1156 | info->key.ttl || info->key.label || info->key.tp_src || | |
1157 | !is_all_zero((const u8 *)&info->key.u, sizeof(info->key.u))) | |
1158 | return false; | |
1159 | else | |
1160 | return true; | |
1161 | } | |
1162 | ||
5b861f6b GM |
1163 | static bool geneve_dst_addr_equal(struct ip_tunnel_info *a, |
1164 | struct ip_tunnel_info *b) | |
1165 | { | |
1166 | if (ip_tunnel_info_af(a) == AF_INET) | |
1167 | return a->key.u.ipv4.dst == b->key.u.ipv4.dst; | |
1168 | else | |
1169 | return ipv6_addr_equal(&a->key.u.ipv6.dst, &b->key.u.ipv6.dst); | |
1170 | } | |
1171 | ||
e305ac6c | 1172 | static int geneve_configure(struct net *net, struct net_device *dev, |
c5ebc440 | 1173 | struct netlink_ext_ack *extack, |
9b4437a5 | 1174 | const struct ip_tunnel_info *info, |
1175 | bool metadata, bool ipv6_rx_csum) | |
2d07dc79 JL |
1176 | { |
1177 | struct geneve_net *gn = net_generic(net, geneve_net_id); | |
371bd106 PS |
1178 | struct geneve_dev *t, *geneve = netdev_priv(dev); |
1179 | bool tun_collect_md, tun_on_same_port; | |
184fc8b5 | 1180 | int err, encap_len; |
2d07dc79 | 1181 | |
c5ebc440 GM |
1182 | if (metadata && !is_tnl_info_zero(info)) { |
1183 | NL_SET_ERR_MSG(extack, | |
1184 | "Device is externally controlled, so attributes (VNI, Port, and so on) must not be specified"); | |
8ed66f0e | 1185 | return -EINVAL; |
c5ebc440 | 1186 | } |
2d07dc79 JL |
1187 | |
1188 | geneve->net = net; | |
1189 | geneve->dev = dev; | |
1190 | ||
9b4437a5 | 1191 | t = geneve_find_dev(gn, info, &tun_on_same_port, &tun_collect_md); |
371bd106 PS |
1192 | if (t) |
1193 | return -EBUSY; | |
1194 | ||
184fc8b5 PA |
1195 | /* make enough headroom for basic scenario */ |
1196 | encap_len = GENEVE_BASE_HLEN + ETH_HLEN; | |
9a1c44d9 | 1197 | if (!metadata && ip_tunnel_info_af(info) == AF_INET) { |
184fc8b5 | 1198 | encap_len += sizeof(struct iphdr); |
91572088 JW |
1199 | dev->max_mtu -= sizeof(struct iphdr); |
1200 | } else { | |
184fc8b5 | 1201 | encap_len += sizeof(struct ipv6hdr); |
91572088 JW |
1202 | dev->max_mtu -= sizeof(struct ipv6hdr); |
1203 | } | |
184fc8b5 PA |
1204 | dev->needed_headroom = encap_len + ETH_HLEN; |
1205 | ||
371bd106 | 1206 | if (metadata) { |
c5ebc440 GM |
1207 | if (tun_on_same_port) { |
1208 | NL_SET_ERR_MSG(extack, | |
1209 | "There can be only one externally controlled device on a destination port"); | |
371bd106 | 1210 | return -EPERM; |
c5ebc440 | 1211 | } |
371bd106 | 1212 | } else { |
c5ebc440 GM |
1213 | if (tun_collect_md) { |
1214 | NL_SET_ERR_MSG(extack, | |
1215 | "There already exists an externally controlled device on this destination port"); | |
371bd106 | 1216 | return -EPERM; |
c5ebc440 | 1217 | } |
371bd106 PS |
1218 | } |
1219 | ||
9b4437a5 | 1220 | dst_cache_reset(&geneve->info.dst_cache); |
1221 | geneve->info = *info; | |
1222 | geneve->collect_md = metadata; | |
1223 | geneve->use_udp6_rx_checksums = ipv6_rx_csum; | |
468dfffc | 1224 | |
2d07dc79 JL |
1225 | err = register_netdevice(dev); |
1226 | if (err) | |
1227 | return err; | |
1228 | ||
e305ac6c | 1229 | list_add(&geneve->next, &gn->geneve_list); |
e305ac6c PS |
1230 | return 0; |
1231 | } | |
1232 | ||
9b4437a5 | 1233 | static void init_tnl_info(struct ip_tunnel_info *info, __u16 dst_port) |
1234 | { | |
1235 | memset(info, 0, sizeof(*info)); | |
1236 | info->key.tp_dst = htons(dst_port); | |
1237 | } | |
1238 | ||
c5ebc440 GM |
1239 | static int geneve_nl2info(struct nlattr *tb[], struct nlattr *data[], |
1240 | struct netlink_ext_ack *extack, | |
1241 | struct ip_tunnel_info *info, bool *metadata, | |
1242 | bool *use_udp6_rx_checksums, bool changelink) | |
e305ac6c | 1243 | { |
c5ebc440 GM |
1244 | int attrtype; |
1245 | ||
1246 | if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6]) { | |
1247 | NL_SET_ERR_MSG(extack, | |
1248 | "Cannot specify both IPv4 and IPv6 Remote addresses"); | |
8ed66f0e | 1249 | return -EINVAL; |
c5ebc440 | 1250 | } |
8ed66f0e JL |
1251 | |
1252 | if (data[IFLA_GENEVE_REMOTE]) { | |
c5ebc440 GM |
1253 | if (changelink && (ip_tunnel_info_af(info) == AF_INET6)) { |
1254 | attrtype = IFLA_GENEVE_REMOTE; | |
1255 | goto change_notsup; | |
1256 | } | |
5b861f6b GM |
1257 | |
1258 | info->key.u.ipv4.dst = | |
8ed66f0e | 1259 | nla_get_in_addr(data[IFLA_GENEVE_REMOTE]); |
9b4437a5 | 1260 | |
5b861f6b | 1261 | if (IN_MULTICAST(ntohl(info->key.u.ipv4.dst))) { |
c5ebc440 GM |
1262 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE], |
1263 | "Remote IPv4 address cannot be Multicast"); | |
9b4437a5 | 1264 | return -EINVAL; |
1265 | } | |
8ed66f0e JL |
1266 | } |
1267 | ||
1268 | if (data[IFLA_GENEVE_REMOTE6]) { | |
9b4437a5 | 1269 | #if IS_ENABLED(CONFIG_IPV6) |
c5ebc440 GM |
1270 | if (changelink && (ip_tunnel_info_af(info) == AF_INET)) { |
1271 | attrtype = IFLA_GENEVE_REMOTE6; | |
1272 | goto change_notsup; | |
1273 | } | |
5b861f6b GM |
1274 | |
1275 | info->mode = IP_TUNNEL_INFO_IPV6; | |
1276 | info->key.u.ipv6.dst = | |
8ed66f0e JL |
1277 | nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]); |
1278 | ||
5b861f6b | 1279 | if (ipv6_addr_type(&info->key.u.ipv6.dst) & |
8ed66f0e | 1280 | IPV6_ADDR_LINKLOCAL) { |
c5ebc440 GM |
1281 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], |
1282 | "Remote IPv6 address cannot be link-local"); | |
8ed66f0e JL |
1283 | return -EINVAL; |
1284 | } | |
5b861f6b | 1285 | if (ipv6_addr_is_multicast(&info->key.u.ipv6.dst)) { |
c5ebc440 GM |
1286 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], |
1287 | "Remote IPv6 address cannot be Multicast"); | |
9b4437a5 | 1288 | return -EINVAL; |
1289 | } | |
5b861f6b GM |
1290 | info->key.tun_flags |= TUNNEL_CSUM; |
1291 | *use_udp6_rx_checksums = true; | |
9b4437a5 | 1292 | #else |
c5ebc440 GM |
1293 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_REMOTE6], |
1294 | "IPv6 support not enabled in the kernel"); | |
9b4437a5 | 1295 | return -EPFNOSUPPORT; |
1296 | #endif | |
8ed66f0e JL |
1297 | } |
1298 | ||
9b4437a5 | 1299 | if (data[IFLA_GENEVE_ID]) { |
1300 | __u32 vni; | |
1301 | __u8 tvni[3]; | |
5b861f6b | 1302 | __be64 tunid; |
9b4437a5 | 1303 | |
e277de5f | 1304 | vni = nla_get_u32(data[IFLA_GENEVE_ID]); |
9b4437a5 | 1305 | tvni[0] = (vni & 0x00ff0000) >> 16; |
1306 | tvni[1] = (vni & 0x0000ff00) >> 8; | |
1307 | tvni[2] = vni & 0x000000ff; | |
e305ac6c | 1308 | |
5b861f6b | 1309 | tunid = vni_to_tunnel_id(tvni); |
c5ebc440 GM |
1310 | if (changelink && (tunid != info->key.tun_id)) { |
1311 | attrtype = IFLA_GENEVE_ID; | |
1312 | goto change_notsup; | |
1313 | } | |
5b861f6b | 1314 | info->key.tun_id = tunid; |
9b4437a5 | 1315 | } |
5b861f6b | 1316 | |
8760ce58 | 1317 | if (data[IFLA_GENEVE_TTL]) |
5b861f6b | 1318 | info->key.ttl = nla_get_u8(data[IFLA_GENEVE_TTL]); |
8760ce58 | 1319 | |
d8951125 | 1320 | if (data[IFLA_GENEVE_TOS]) |
5b861f6b | 1321 | info->key.tos = nla_get_u8(data[IFLA_GENEVE_TOS]); |
d8951125 | 1322 | |
9b4437a5 | 1323 | if (data[IFLA_GENEVE_LABEL]) { |
5b861f6b | 1324 | info->key.label = nla_get_be32(data[IFLA_GENEVE_LABEL]) & |
9b4437a5 | 1325 | IPV6_FLOWLABEL_MASK; |
c5ebc440 GM |
1326 | if (info->key.label && (!(info->mode & IP_TUNNEL_INFO_IPV6))) { |
1327 | NL_SET_ERR_MSG_ATTR(extack, data[IFLA_GENEVE_LABEL], | |
1328 | "Label attribute only applies for IPv6 Geneve devices"); | |
9b4437a5 | 1329 | return -EINVAL; |
c5ebc440 | 1330 | } |
9b4437a5 | 1331 | } |
8eb3b995 | 1332 | |
5b861f6b | 1333 | if (data[IFLA_GENEVE_PORT]) { |
c5ebc440 GM |
1334 | if (changelink) { |
1335 | attrtype = IFLA_GENEVE_PORT; | |
1336 | goto change_notsup; | |
1337 | } | |
5b861f6b GM |
1338 | info->key.tp_dst = nla_get_be16(data[IFLA_GENEVE_PORT]); |
1339 | } | |
2d07dc79 | 1340 | |
5b861f6b | 1341 | if (data[IFLA_GENEVE_COLLECT_METADATA]) { |
c5ebc440 GM |
1342 | if (changelink) { |
1343 | attrtype = IFLA_GENEVE_COLLECT_METADATA; | |
1344 | goto change_notsup; | |
1345 | } | |
5b861f6b GM |
1346 | *metadata = true; |
1347 | } | |
2d07dc79 | 1348 | |
5b861f6b | 1349 | if (data[IFLA_GENEVE_UDP_CSUM]) { |
c5ebc440 GM |
1350 | if (changelink) { |
1351 | attrtype = IFLA_GENEVE_UDP_CSUM; | |
1352 | goto change_notsup; | |
1353 | } | |
5b861f6b GM |
1354 | if (nla_get_u8(data[IFLA_GENEVE_UDP_CSUM])) |
1355 | info->key.tun_flags |= TUNNEL_CSUM; | |
1356 | } | |
abe492b4 | 1357 | |
5b861f6b | 1358 | if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX]) { |
c5ebc440 GM |
1359 | if (changelink) { |
1360 | attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_TX; | |
1361 | goto change_notsup; | |
1362 | } | |
5b861f6b GM |
1363 | if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_TX])) |
1364 | info->key.tun_flags &= ~TUNNEL_CSUM; | |
1365 | } | |
abe492b4 | 1366 | |
5b861f6b | 1367 | if (data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX]) { |
c5ebc440 GM |
1368 | if (changelink) { |
1369 | attrtype = IFLA_GENEVE_UDP_ZERO_CSUM6_RX; | |
1370 | goto change_notsup; | |
1371 | } | |
5b861f6b GM |
1372 | if (nla_get_u8(data[IFLA_GENEVE_UDP_ZERO_CSUM6_RX])) |
1373 | *use_udp6_rx_checksums = false; | |
1374 | } | |
1375 | ||
1376 | return 0; | |
c5ebc440 GM |
1377 | change_notsup: |
1378 | NL_SET_ERR_MSG_ATTR(extack, data[attrtype], | |
1379 | "Changing VNI, Port, endpoint IP address family, external, and UDP checksum attributes are not supported"); | |
1380 | return -EOPNOTSUPP; | |
5b861f6b GM |
1381 | } |
1382 | ||
1383 | static int geneve_newlink(struct net *net, struct net_device *dev, | |
1384 | struct nlattr *tb[], struct nlattr *data[], | |
1385 | struct netlink_ext_ack *extack) | |
1386 | { | |
1387 | bool use_udp6_rx_checksums = false; | |
1388 | struct ip_tunnel_info info; | |
1389 | bool metadata = false; | |
1390 | int err; | |
1391 | ||
1392 | init_tnl_info(&info, GENEVE_UDP_PORT); | |
c5ebc440 | 1393 | err = geneve_nl2info(tb, data, extack, &info, &metadata, |
5b861f6b GM |
1394 | &use_udp6_rx_checksums, false); |
1395 | if (err) | |
1396 | return err; | |
abe492b4 | 1397 | |
c5ebc440 GM |
1398 | return geneve_configure(net, dev, extack, &info, metadata, |
1399 | use_udp6_rx_checksums); | |
2d07dc79 JL |
1400 | } |
1401 | ||
5b861f6b GM |
1402 | /* Quiesces the geneve device data path for both TX and RX. |
1403 | * | |
1404 | * On transmit geneve checks for non-NULL geneve_sock before it proceeds. | |
1405 | * So, if we set that socket to NULL under RCU and wait for synchronize_net() | |
1406 | * to complete for the existing set of in-flight packets to be transmitted, | |
1407 | * then we would have quiesced the transmit data path. All the future packets | |
1408 | * will get dropped until we unquiesce the data path. | |
1409 | * | |
1410 | * On receive geneve dereference the geneve_sock stashed in the socket. So, | |
1411 | * if we set that to NULL under RCU and wait for synchronize_net() to | |
1412 | * complete, then we would have quiesced the receive data path. | |
1413 | */ | |
1414 | static void geneve_quiesce(struct geneve_dev *geneve, struct geneve_sock **gs4, | |
1415 | struct geneve_sock **gs6) | |
1416 | { | |
1417 | *gs4 = rtnl_dereference(geneve->sock4); | |
1418 | rcu_assign_pointer(geneve->sock4, NULL); | |
1419 | if (*gs4) | |
1420 | rcu_assign_sk_user_data((*gs4)->sock->sk, NULL); | |
1421 | #if IS_ENABLED(CONFIG_IPV6) | |
1422 | *gs6 = rtnl_dereference(geneve->sock6); | |
1423 | rcu_assign_pointer(geneve->sock6, NULL); | |
1424 | if (*gs6) | |
1425 | rcu_assign_sk_user_data((*gs6)->sock->sk, NULL); | |
1426 | #else | |
1427 | *gs6 = NULL; | |
1428 | #endif | |
1429 | synchronize_net(); | |
1430 | } | |
1431 | ||
1432 | /* Resumes the geneve device data path for both TX and RX. */ | |
1433 | static void geneve_unquiesce(struct geneve_dev *geneve, struct geneve_sock *gs4, | |
1434 | struct geneve_sock __maybe_unused *gs6) | |
1435 | { | |
1436 | rcu_assign_pointer(geneve->sock4, gs4); | |
1437 | if (gs4) | |
1438 | rcu_assign_sk_user_data(gs4->sock->sk, gs4); | |
1439 | #if IS_ENABLED(CONFIG_IPV6) | |
1440 | rcu_assign_pointer(geneve->sock6, gs6); | |
1441 | if (gs6) | |
1442 | rcu_assign_sk_user_data(gs6->sock->sk, gs6); | |
1443 | #endif | |
1444 | synchronize_net(); | |
1445 | } | |
1446 | ||
1447 | static int geneve_changelink(struct net_device *dev, struct nlattr *tb[], | |
1448 | struct nlattr *data[], | |
1449 | struct netlink_ext_ack *extack) | |
1450 | { | |
1451 | struct geneve_dev *geneve = netdev_priv(dev); | |
1452 | struct geneve_sock *gs4, *gs6; | |
1453 | struct ip_tunnel_info info; | |
1454 | bool metadata; | |
1455 | bool use_udp6_rx_checksums; | |
1456 | int err; | |
1457 | ||
1458 | /* If the geneve device is configured for metadata (or externally | |
1459 | * controlled, for example, OVS), then nothing can be changed. | |
1460 | */ | |
1461 | if (geneve->collect_md) | |
1462 | return -EOPNOTSUPP; | |
1463 | ||
1464 | /* Start with the existing info. */ | |
1465 | memcpy(&info, &geneve->info, sizeof(info)); | |
1466 | metadata = geneve->collect_md; | |
1467 | use_udp6_rx_checksums = geneve->use_udp6_rx_checksums; | |
c5ebc440 | 1468 | err = geneve_nl2info(tb, data, extack, &info, &metadata, |
5b861f6b GM |
1469 | &use_udp6_rx_checksums, true); |
1470 | if (err) | |
1471 | return err; | |
1472 | ||
1473 | if (!geneve_dst_addr_equal(&geneve->info, &info)) | |
1474 | dst_cache_reset(&info.dst_cache); | |
1475 | ||
1476 | geneve_quiesce(geneve, &gs4, &gs6); | |
1477 | geneve->info = info; | |
1478 | geneve->collect_md = metadata; | |
1479 | geneve->use_udp6_rx_checksums = use_udp6_rx_checksums; | |
1480 | geneve_unquiesce(geneve, gs4, gs6); | |
1481 | ||
1482 | return 0; | |
1483 | } | |
1484 | ||
2d07dc79 JL |
1485 | static void geneve_dellink(struct net_device *dev, struct list_head *head) |
1486 | { | |
1487 | struct geneve_dev *geneve = netdev_priv(dev); | |
1488 | ||
2d07dc79 JL |
1489 | list_del(&geneve->next); |
1490 | unregister_netdevice_queue(dev, head); | |
1491 | } | |
1492 | ||
1493 | static size_t geneve_get_size(const struct net_device *dev) | |
1494 | { | |
1495 | return nla_total_size(sizeof(__u32)) + /* IFLA_GENEVE_ID */ | |
8ed66f0e | 1496 | nla_total_size(sizeof(struct in6_addr)) + /* IFLA_GENEVE_REMOTE{6} */ |
8760ce58 | 1497 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TTL */ |
d8951125 | 1498 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_TOS */ |
8eb3b995 | 1499 | nla_total_size(sizeof(__be32)) + /* IFLA_GENEVE_LABEL */ |
7bbe33ff | 1500 | nla_total_size(sizeof(__be16)) + /* IFLA_GENEVE_PORT */ |
e305ac6c | 1501 | nla_total_size(0) + /* IFLA_GENEVE_COLLECT_METADATA */ |
abe492b4 TH |
1502 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_CSUM */ |
1503 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_TX */ | |
1504 | nla_total_size(sizeof(__u8)) + /* IFLA_GENEVE_UDP_ZERO_CSUM6_RX */ | |
2d07dc79 JL |
1505 | 0; |
1506 | } | |
1507 | ||
1508 | static int geneve_fill_info(struct sk_buff *skb, const struct net_device *dev) | |
1509 | { | |
1510 | struct geneve_dev *geneve = netdev_priv(dev); | |
9b4437a5 | 1511 | struct ip_tunnel_info *info = &geneve->info; |
1512 | __u8 tmp_vni[3]; | |
2d07dc79 JL |
1513 | __u32 vni; |
1514 | ||
9b4437a5 | 1515 | tunnel_id_to_vni(info->key.tun_id, tmp_vni); |
1516 | vni = (tmp_vni[0] << 16) | (tmp_vni[1] << 8) | tmp_vni[2]; | |
2d07dc79 JL |
1517 | if (nla_put_u32(skb, IFLA_GENEVE_ID, vni)) |
1518 | goto nla_put_failure; | |
1519 | ||
11387fe4 | 1520 | if (rtnl_dereference(geneve->sock4)) { |
8ed66f0e | 1521 | if (nla_put_in_addr(skb, IFLA_GENEVE_REMOTE, |
9b4437a5 | 1522 | info->key.u.ipv4.dst)) |
1523 | goto nla_put_failure; | |
1524 | ||
1525 | if (nla_put_u8(skb, IFLA_GENEVE_UDP_CSUM, | |
1526 | !!(info->key.tun_flags & TUNNEL_CSUM))) | |
8ed66f0e | 1527 | goto nla_put_failure; |
9b4437a5 | 1528 | |
11387fe4 EG |
1529 | } |
1530 | ||
8ed66f0e | 1531 | #if IS_ENABLED(CONFIG_IPV6) |
11387fe4 | 1532 | if (rtnl_dereference(geneve->sock6)) { |
8ed66f0e | 1533 | if (nla_put_in6_addr(skb, IFLA_GENEVE_REMOTE6, |
9b4437a5 | 1534 | &info->key.u.ipv6.dst)) |
1535 | goto nla_put_failure; | |
1536 | ||
1537 | if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_TX, | |
1538 | !(info->key.tun_flags & TUNNEL_CSUM))) | |
1539 | goto nla_put_failure; | |
1540 | ||
1541 | if (nla_put_u8(skb, IFLA_GENEVE_UDP_ZERO_CSUM6_RX, | |
1542 | !geneve->use_udp6_rx_checksums)) | |
8ed66f0e | 1543 | goto nla_put_failure; |
8ed66f0e | 1544 | } |
11387fe4 | 1545 | #endif |
2d07dc79 | 1546 | |
9b4437a5 | 1547 | if (nla_put_u8(skb, IFLA_GENEVE_TTL, info->key.ttl) || |
1548 | nla_put_u8(skb, IFLA_GENEVE_TOS, info->key.tos) || | |
1549 | nla_put_be32(skb, IFLA_GENEVE_LABEL, info->key.label)) | |
8760ce58 JL |
1550 | goto nla_put_failure; |
1551 | ||
9b4437a5 | 1552 | if (nla_put_be16(skb, IFLA_GENEVE_PORT, info->key.tp_dst)) |
cd7918b3 PS |
1553 | goto nla_put_failure; |
1554 | ||
e305ac6c PS |
1555 | if (geneve->collect_md) { |
1556 | if (nla_put_flag(skb, IFLA_GENEVE_COLLECT_METADATA)) | |
1557 | goto nla_put_failure; | |
1558 | } | |
2d07dc79 JL |
1559 | return 0; |
1560 | ||
1561 | nla_put_failure: | |
1562 | return -EMSGSIZE; | |
1563 | } | |
1564 | ||
1565 | static struct rtnl_link_ops geneve_link_ops __read_mostly = { | |
1566 | .kind = "geneve", | |
1567 | .maxtype = IFLA_GENEVE_MAX, | |
1568 | .policy = geneve_policy, | |
1569 | .priv_size = sizeof(struct geneve_dev), | |
1570 | .setup = geneve_setup, | |
1571 | .validate = geneve_validate, | |
1572 | .newlink = geneve_newlink, | |
5b861f6b | 1573 | .changelink = geneve_changelink, |
2d07dc79 JL |
1574 | .dellink = geneve_dellink, |
1575 | .get_size = geneve_get_size, | |
1576 | .fill_info = geneve_fill_info, | |
1577 | }; | |
1578 | ||
e305ac6c PS |
1579 | struct net_device *geneve_dev_create_fb(struct net *net, const char *name, |
1580 | u8 name_assign_type, u16 dst_port) | |
1581 | { | |
1582 | struct nlattr *tb[IFLA_MAX + 1]; | |
9b4437a5 | 1583 | struct ip_tunnel_info info; |
e305ac6c | 1584 | struct net_device *dev; |
106da663 | 1585 | LIST_HEAD(list_kill); |
e305ac6c PS |
1586 | int err; |
1587 | ||
1588 | memset(tb, 0, sizeof(tb)); | |
1589 | dev = rtnl_create_link(net, name, name_assign_type, | |
1590 | &geneve_link_ops, tb); | |
1591 | if (IS_ERR(dev)) | |
1592 | return dev; | |
1593 | ||
9b4437a5 | 1594 | init_tnl_info(&info, dst_port); |
c5ebc440 | 1595 | err = geneve_configure(net, dev, NULL, &info, true, true); |
106da663 ND |
1596 | if (err) { |
1597 | free_netdev(dev); | |
1598 | return ERR_PTR(err); | |
1599 | } | |
7e059158 DW |
1600 | |
1601 | /* openvswitch users expect packet sizes to be unrestricted, | |
1602 | * so set the largest MTU we can. | |
1603 | */ | |
91572088 | 1604 | err = geneve_change_mtu(dev, IP_MAX_MTU); |
7e059158 DW |
1605 | if (err) |
1606 | goto err; | |
1607 | ||
41009481 ND |
1608 | err = rtnl_configure_link(dev, NULL); |
1609 | if (err < 0) | |
1610 | goto err; | |
1611 | ||
e305ac6c | 1612 | return dev; |
9b4437a5 | 1613 | err: |
106da663 ND |
1614 | geneve_dellink(dev, &list_kill); |
1615 | unregister_netdevice_many(&list_kill); | |
7e059158 | 1616 | return ERR_PTR(err); |
e305ac6c PS |
1617 | } |
1618 | EXPORT_SYMBOL_GPL(geneve_dev_create_fb); | |
1619 | ||
681e683f HFS |
1620 | static int geneve_netdevice_event(struct notifier_block *unused, |
1621 | unsigned long event, void *ptr) | |
1622 | { | |
1623 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
1624 | ||
2d2b13fc | 1625 | if (event == NETDEV_UDP_TUNNEL_PUSH_INFO || |
04584957 | 1626 | event == NETDEV_UDP_TUNNEL_DROP_INFO) { |
2d2b13fc | 1627 | geneve_offload_rx_ports(dev, event == NETDEV_UDP_TUNNEL_PUSH_INFO); |
04584957 SD |
1628 | } else if (event == NETDEV_UNREGISTER) { |
1629 | geneve_offload_rx_ports(dev, false); | |
1630 | } else if (event == NETDEV_REGISTER) { | |
1631 | geneve_offload_rx_ports(dev, true); | |
1632 | } | |
681e683f HFS |
1633 | |
1634 | return NOTIFY_DONE; | |
1635 | } | |
1636 | ||
1637 | static struct notifier_block geneve_notifier_block __read_mostly = { | |
1638 | .notifier_call = geneve_netdevice_event, | |
1639 | }; | |
1640 | ||
2d07dc79 JL |
1641 | static __net_init int geneve_init_net(struct net *net) |
1642 | { | |
1643 | struct geneve_net *gn = net_generic(net, geneve_net_id); | |
2d07dc79 JL |
1644 | |
1645 | INIT_LIST_HEAD(&gn->geneve_list); | |
371bd106 | 1646 | INIT_LIST_HEAD(&gn->sock_list); |
2d07dc79 JL |
1647 | return 0; |
1648 | } | |
1649 | ||
1650 | static void __net_exit geneve_exit_net(struct net *net) | |
1651 | { | |
1652 | struct geneve_net *gn = net_generic(net, geneve_net_id); | |
1653 | struct geneve_dev *geneve, *next; | |
1654 | struct net_device *dev, *aux; | |
1655 | LIST_HEAD(list); | |
1656 | ||
1657 | rtnl_lock(); | |
1658 | ||
1659 | /* gather any geneve devices that were moved into this ns */ | |
1660 | for_each_netdev_safe(net, dev, aux) | |
1661 | if (dev->rtnl_link_ops == &geneve_link_ops) | |
1662 | unregister_netdevice_queue(dev, &list); | |
1663 | ||
1664 | /* now gather any other geneve devices that were created in this ns */ | |
1665 | list_for_each_entry_safe(geneve, next, &gn->geneve_list, next) { | |
1666 | /* If geneve->dev is in the same netns, it was already added | |
1667 | * to the list by the previous loop. | |
1668 | */ | |
1669 | if (!net_eq(dev_net(geneve->dev), net)) | |
1670 | unregister_netdevice_queue(geneve->dev, &list); | |
1671 | } | |
1672 | ||
1673 | /* unregister the devices gathered above */ | |
1674 | unregister_netdevice_many(&list); | |
1675 | rtnl_unlock(); | |
1676 | } | |
1677 | ||
1678 | static struct pernet_operations geneve_net_ops = { | |
1679 | .init = geneve_init_net, | |
1680 | .exit = geneve_exit_net, | |
1681 | .id = &geneve_net_id, | |
1682 | .size = sizeof(struct geneve_net), | |
1683 | }; | |
1684 | ||
1685 | static int __init geneve_init_module(void) | |
1686 | { | |
1687 | int rc; | |
1688 | ||
1689 | rc = register_pernet_subsys(&geneve_net_ops); | |
1690 | if (rc) | |
1691 | goto out1; | |
1692 | ||
681e683f | 1693 | rc = register_netdevice_notifier(&geneve_notifier_block); |
2d07dc79 JL |
1694 | if (rc) |
1695 | goto out2; | |
1696 | ||
681e683f HFS |
1697 | rc = rtnl_link_register(&geneve_link_ops); |
1698 | if (rc) | |
1699 | goto out3; | |
1700 | ||
2d07dc79 | 1701 | return 0; |
681e683f HFS |
1702 | out3: |
1703 | unregister_netdevice_notifier(&geneve_notifier_block); | |
2d07dc79 JL |
1704 | out2: |
1705 | unregister_pernet_subsys(&geneve_net_ops); | |
1706 | out1: | |
1707 | return rc; | |
1708 | } | |
1709 | late_initcall(geneve_init_module); | |
1710 | ||
1711 | static void __exit geneve_cleanup_module(void) | |
1712 | { | |
1713 | rtnl_link_unregister(&geneve_link_ops); | |
681e683f | 1714 | unregister_netdevice_notifier(&geneve_notifier_block); |
2d07dc79 JL |
1715 | unregister_pernet_subsys(&geneve_net_ops); |
1716 | } | |
1717 | module_exit(geneve_cleanup_module); | |
1718 | ||
1719 | MODULE_LICENSE("GPL"); | |
1720 | MODULE_VERSION(GENEVE_NETDEV_VER); | |
1721 | MODULE_AUTHOR("John W. Linville <linville@tuxdriver.com>"); | |
1722 | MODULE_DESCRIPTION("Interface driver for GENEVE encapsulated traffic"); | |
1723 | MODULE_ALIAS_RTNL_LINK("geneve"); |