#include <net/ip.h>
#include <net/icmp.h>
#include <net/protocol.h>
-#include <net/ipip.h>
+#include <net/ip_tunnels.h>
#include <net/arp.h>
#include <net/checksum.h>
#include <net/dsfield.h>
fatal route to network, even if it were you who configured
fatal static route: you are innocent. :-)
-
-
- 3. Really, ipv4/ipip.c, ipv4/ip_gre.c and ipv6/sit.c contain
- practically identical code. It would be good to glue them
- together, but it is not very evident, how to make them modular.
- sit is integral part of IPv6, ipip and gre are naturally modular.
- We could extract common parts (hash table, ioctl etc)
- to a separate module (ip_tunnel.c).
-
Alexey Kuznetsov.
*/
static struct rtnl_link_ops ipgre_link_ops __read_mostly;
static int ipgre_tunnel_init(struct net_device *dev);
-static void ipgre_tunnel_setup(struct net_device *dev);
-static int ipgre_tunnel_bind_dev(struct net_device *dev);
-
-/* Fallback tunnel: no source, no destination, no key, no options */
-
-#define HASH_SIZE 16
static int ipgre_net_id __read_mostly;
-struct ipgre_net {
- struct ip_tunnel __rcu *tunnels[4][HASH_SIZE];
-
- struct net_device *fb_tunnel_dev;
-};
-
-/* Tunnel hash table */
-
-/*
- 4 hash tables:
-
- 3: (remote,local)
- 2: (remote,*)
- 1: (*,local)
- 0: (*,*)
+static int gre_tap_net_id __read_mostly;
- We require exact key match i.e. if a key is present in packet
- it will match only tunnel with the same key; if it is not present,
- it will match only keyless tunnel.
-
- All keysless packets, if not matched configured keyless tunnels
- will match fallback tunnel.
- */
+static __sum16 check_checksum(struct sk_buff *skb)
+{
+ __sum16 csum = 0;
-#define HASH(addr) (((__force u32)addr^((__force u32)addr>>4))&0xF)
+ switch (skb->ip_summed) {
+ case CHECKSUM_COMPLETE:
+ csum = csum_fold(skb->csum);
-#define tunnels_r_l tunnels[3]
-#define tunnels_r tunnels[2]
-#define tunnels_l tunnels[1]
-#define tunnels_wc tunnels[0]
+ if (!csum)
+ break;
+ /* Fall through. */
-static struct rtnl_link_stats64 *ipgre_get_stats64(struct net_device *dev,
- struct rtnl_link_stats64 *tot)
-{
- int i;
-
- for_each_possible_cpu(i) {
- const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
- u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
- unsigned int start;
-
- do {
- start = u64_stats_fetch_begin_bh(&tstats->syncp);
- rx_packets = tstats->rx_packets;
- tx_packets = tstats->tx_packets;
- rx_bytes = tstats->rx_bytes;
- tx_bytes = tstats->tx_bytes;
- } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
-
- tot->rx_packets += rx_packets;
- tot->tx_packets += tx_packets;
- tot->rx_bytes += rx_bytes;
- tot->tx_bytes += tx_bytes;
+ case CHECKSUM_NONE:
+ skb->csum = 0;
+ csum = __skb_checksum_complete(skb);
+ skb->ip_summed = CHECKSUM_COMPLETE;
+ break;
}
- tot->multicast = dev->stats.multicast;
- tot->rx_crc_errors = dev->stats.rx_crc_errors;
- tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
- tot->rx_length_errors = dev->stats.rx_length_errors;
- tot->rx_frame_errors = dev->stats.rx_frame_errors;
- tot->rx_errors = dev->stats.rx_errors;
-
- tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
- tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
- tot->tx_dropped = dev->stats.tx_dropped;
- tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
- tot->tx_errors = dev->stats.tx_errors;
-
- return tot;
+ return csum;
}
-/* Does key in tunnel parameters match packet */
-static bool ipgre_key_match(const struct ip_tunnel_parm *p,
- __be16 flags, __be32 key)
+static int ip_gre_calc_hlen(__be16 o_flags)
{
- if (p->i_flags & GRE_KEY) {
- if (flags & GRE_KEY)
- return key == p->i_key;
- else
- return false; /* key expected, none present */
- } else
- return !(flags & GRE_KEY);
-}
+ int addend = 4;
-/* Given src, dst and key, find appropriate for input tunnel. */
+ if (o_flags&TUNNEL_CSUM)
+ addend += 4;
+ if (o_flags&TUNNEL_KEY)
+ addend += 4;
+ if (o_flags&TUNNEL_SEQ)
+ addend += 4;
+ return addend;
+}
-static struct ip_tunnel *ipgre_tunnel_lookup(struct net_device *dev,
- __be32 remote, __be32 local,
- __be16 flags, __be32 key,
- __be16 gre_proto)
+static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
+ bool *csum_err, int *hdr_len)
{
- struct net *net = dev_net(dev);
- int link = dev->ifindex;
- unsigned int h0 = HASH(remote);
- unsigned int h1 = HASH(key);
- struct ip_tunnel *t, *cand = NULL;
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
- int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
- ARPHRD_ETHER : ARPHRD_IPGRE;
- int score, cand_score = 4;
-
- for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
- if (local != t->parms.iph.saddr ||
- remote != t->parms.iph.daddr ||
- !(t->dev->flags & IFF_UP))
- continue;
-
- if (!ipgre_key_match(&t->parms, flags, key))
- continue;
-
- if (t->dev->type != ARPHRD_IPGRE &&
- t->dev->type != dev_type)
- continue;
-
- score = 0;
- if (t->parms.link != link)
- score |= 1;
- if (t->dev->type != dev_type)
- score |= 2;
- if (score == 0)
- return t;
-
- if (score < cand_score) {
- cand = t;
- cand_score = score;
- }
- }
-
- for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
- if (remote != t->parms.iph.daddr ||
- !(t->dev->flags & IFF_UP))
- continue;
-
- if (!ipgre_key_match(&t->parms, flags, key))
- continue;
-
- if (t->dev->type != ARPHRD_IPGRE &&
- t->dev->type != dev_type)
- continue;
-
- score = 0;
- if (t->parms.link != link)
- score |= 1;
- if (t->dev->type != dev_type)
- score |= 2;
- if (score == 0)
- return t;
-
- if (score < cand_score) {
- cand = t;
- cand_score = score;
- }
- }
+ struct iphdr *iph = ip_hdr(skb);
+ struct gre_base_hdr *greh;
+ __be32 *options;
- for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
- if ((local != t->parms.iph.saddr &&
- (local != t->parms.iph.daddr ||
- !ipv4_is_multicast(local))) ||
- !(t->dev->flags & IFF_UP))
- continue;
-
- if (!ipgre_key_match(&t->parms, flags, key))
- continue;
-
- if (t->dev->type != ARPHRD_IPGRE &&
- t->dev->type != dev_type)
- continue;
-
- score = 0;
- if (t->parms.link != link)
- score |= 1;
- if (t->dev->type != dev_type)
- score |= 2;
- if (score == 0)
- return t;
-
- if (score < cand_score) {
- cand = t;
- cand_score = score;
- }
- }
+ if (unlikely(!pskb_may_pull(skb, sizeof(struct gre_base_hdr))))
+ return -EINVAL;
- for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
- if (t->parms.i_key != key ||
- !(t->dev->flags & IFF_UP))
- continue;
-
- if (t->dev->type != ARPHRD_IPGRE &&
- t->dev->type != dev_type)
- continue;
-
- score = 0;
- if (t->parms.link != link)
- score |= 1;
- if (t->dev->type != dev_type)
- score |= 2;
- if (score == 0)
- return t;
-
- if (score < cand_score) {
- cand = t;
- cand_score = score;
- }
- }
+ greh = (struct gre_base_hdr *)((u8 *)iph + (iph->ihl << 2));
+ if (unlikely(greh->flags & (GRE_VERSION | GRE_ROUTING)))
+ return -EINVAL;
- if (cand != NULL)
- return cand;
+ tpi->flags = gre_flags_to_tnl_flags(greh->flags);
+ *hdr_len = ip_gre_calc_hlen(tpi->flags);
- dev = ign->fb_tunnel_dev;
- if (dev->flags & IFF_UP)
- return netdev_priv(dev);
+ if (!pskb_may_pull(skb, *hdr_len))
+ return -EINVAL;
- return NULL;
-}
+ tpi->proto = greh->protocol;
-static struct ip_tunnel __rcu **__ipgre_bucket(struct ipgre_net *ign,
- struct ip_tunnel_parm *parms)
-{
- __be32 remote = parms->iph.daddr;
- __be32 local = parms->iph.saddr;
- __be32 key = parms->i_key;
- unsigned int h = HASH(key);
- int prio = 0;
-
- if (local)
- prio |= 1;
- if (remote && !ipv4_is_multicast(remote)) {
- prio |= 2;
- h ^= HASH(remote);
+ options = (__be32 *)(greh + 1);
+ if (greh->flags & GRE_CSUM) {
+ if (check_checksum(skb)) {
+ *csum_err = true;
+ return -EINVAL;
+ }
+ options++;
}
- return &ign->tunnels[prio][h];
-}
-
-static inline struct ip_tunnel __rcu **ipgre_bucket(struct ipgre_net *ign,
- struct ip_tunnel *t)
-{
- return __ipgre_bucket(ign, &t->parms);
-}
-
-static void ipgre_tunnel_link(struct ipgre_net *ign, struct ip_tunnel *t)
-{
- struct ip_tunnel __rcu **tp = ipgre_bucket(ign, t);
+ if (greh->flags & GRE_KEY) {
+ tpi->key = *options;
+ options++;
+ } else
+ tpi->key = 0;
- rcu_assign_pointer(t->next, rtnl_dereference(*tp));
- rcu_assign_pointer(*tp, t);
-}
+ if (unlikely(greh->flags & GRE_SEQ)) {
+ tpi->seq = *options;
+ options++;
+ } else
+ tpi->seq = 0;
-static void ipgre_tunnel_unlink(struct ipgre_net *ign, struct ip_tunnel *t)
-{
- struct ip_tunnel __rcu **tp;
- struct ip_tunnel *iter;
-
- for (tp = ipgre_bucket(ign, t);
- (iter = rtnl_dereference(*tp)) != NULL;
- tp = &iter->next) {
- if (t == iter) {
- rcu_assign_pointer(*tp, t->next);
- break;
+ /* WCCP version 1 and 2 protocol decoding.
+ * - Change protocol to IP
+ * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
+ */
+ if (greh->flags == 0 && tpi->proto == htons(ETH_P_WCCP)) {
+ tpi->proto = htons(ETH_P_IP);
+ if ((*(u8 *)options & 0xF0) != 0x40) {
+ *hdr_len += 4;
+ if (!pskb_may_pull(skb, *hdr_len))
+ return -EINVAL;
}
}
-}
-
-static struct ip_tunnel *ipgre_tunnel_find(struct net *net,
- struct ip_tunnel_parm *parms,
- int type)
-{
- __be32 remote = parms->iph.daddr;
- __be32 local = parms->iph.saddr;
- __be32 key = parms->i_key;
- int link = parms->link;
- struct ip_tunnel *t;
- struct ip_tunnel __rcu **tp;
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
- for (tp = __ipgre_bucket(ign, parms);
- (t = rtnl_dereference(*tp)) != NULL;
- tp = &t->next)
- if (local == t->parms.iph.saddr &&
- remote == t->parms.iph.daddr &&
- key == t->parms.i_key &&
- link == t->parms.link &&
- type == t->dev->type)
- break;
-
- return t;
-}
-
-static struct ip_tunnel *ipgre_tunnel_locate(struct net *net,
- struct ip_tunnel_parm *parms, int create)
-{
- struct ip_tunnel *t, *nt;
- struct net_device *dev;
- char name[IFNAMSIZ];
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
- t = ipgre_tunnel_find(net, parms, ARPHRD_IPGRE);
- if (t || !create)
- return t;
-
- if (parms->name[0])
- strlcpy(name, parms->name, IFNAMSIZ);
- else
- strcpy(name, "gre%d");
-
- dev = alloc_netdev(sizeof(*t), name, ipgre_tunnel_setup);
- if (!dev)
- return NULL;
-
- dev_net_set(dev, net);
-
- nt = netdev_priv(dev);
- nt->parms = *parms;
- dev->rtnl_link_ops = &ipgre_link_ops;
- dev->mtu = ipgre_tunnel_bind_dev(dev);
-
- if (register_netdevice(dev) < 0)
- goto failed_free;
-
- /* Can use a lockless transmit, unless we generate output sequences */
- if (!(nt->parms.o_flags & GRE_SEQ))
- dev->features |= NETIF_F_LLTX;
-
- dev_hold(dev);
- ipgre_tunnel_link(ign, nt);
- return nt;
-
-failed_free:
- free_netdev(dev);
- return NULL;
-}
-
-static void ipgre_tunnel_uninit(struct net_device *dev)
-{
- struct net *net = dev_net(dev);
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
- ipgre_tunnel_unlink(ign, netdev_priv(dev));
- dev_put(dev);
+ return 0;
}
-
static void ipgre_err(struct sk_buff *skb, u32 info)
{
-/* All the routers (except for Linux) return only
- 8 bytes of packet payload. It means, that precise relaying of
- ICMP in the real Internet is absolutely infeasible.
+ /* All the routers (except for Linux) return only
+ 8 bytes of packet payload. It means, that precise relaying of
+ ICMP in the real Internet is absolutely infeasible.
- Moreover, Cisco "wise men" put GRE key to the third word
- in GRE header. It makes impossible maintaining even soft state for keyed
- GRE tunnels with enabled checksum. Tell them "thank you".
-
- Well, I wonder, rfc1812 was written by Cisco employee,
- what the hell these idiots break standards established
- by themselves???
- */
+ Moreover, Cisco "wise men" put GRE key to the third word
+ in GRE header. It makes impossible maintaining even soft
+ state for keyed GRE tunnels with enabled checksum. Tell
+ them "thank you".
+ Well, I wonder, rfc1812 was written by Cisco employee,
+ what the hell these idiots break standards established
+ by themselves???
+ */
+ struct net *net = dev_net(skb->dev);
+ struct ip_tunnel_net *itn;
const struct iphdr *iph = (const struct iphdr *)skb->data;
- __be16 *p = (__be16 *)(skb->data+(iph->ihl<<2));
- int grehlen = (iph->ihl<<2) + 4;
const int type = icmp_hdr(skb)->type;
const int code = icmp_hdr(skb)->code;
struct ip_tunnel *t;
- __be16 flags;
- __be32 key = 0;
+ struct tnl_ptk_info tpi;
+ int hdr_len;
+ bool csum_err = false;
- flags = p[0];
- if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
- if (flags&(GRE_VERSION|GRE_ROUTING))
+ if (parse_gre_header(skb, &tpi, &csum_err, &hdr_len)) {
+ if (!csum_err) /* ignore csum errors. */
return;
- if (flags&GRE_KEY) {
- grehlen += 4;
- if (flags&GRE_CSUM)
- grehlen += 4;
- }
}
- /* If only 8 bytes returned, keyed message will be dropped here */
- if (skb_headlen(skb) < grehlen)
- return;
-
- if (flags & GRE_KEY)
- key = *(((__be32 *)p) + (grehlen / 4) - 1);
-
switch (type) {
default:
case ICMP_PARAMETERPROB:
break;
}
- t = ipgre_tunnel_lookup(skb->dev, iph->daddr, iph->saddr,
- flags, key, p[1]);
+ if (tpi.proto == htons(ETH_P_TEB))
+ itn = net_generic(net, gre_tap_net_id);
+ else
+ itn = net_generic(net, ipgre_net_id);
+
+ t = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi.flags,
+ iph->daddr, iph->saddr, tpi.key);
if (t == NULL)
return;
t->err_time = jiffies;
}
-static inline u8
-ipgre_ecn_encapsulate(u8 tos, const struct iphdr *old_iph, struct sk_buff *skb)
-{
- u8 inner = 0;
- if (skb->protocol == htons(ETH_P_IP))
- inner = old_iph->tos;
- else if (skb->protocol == htons(ETH_P_IPV6))
- inner = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
- return INET_ECN_encapsulate(tos, inner);
-}
-
static int ipgre_rcv(struct sk_buff *skb)
{
+ struct net *net = dev_net(skb->dev);
+ struct ip_tunnel_net *itn;
const struct iphdr *iph;
- u8 *h;
- __be16 flags;
- __sum16 csum = 0;
- __be32 key = 0;
- u32 seqno = 0;
struct ip_tunnel *tunnel;
- int offset = 4;
- __be16 gre_proto;
- int err;
+ struct tnl_ptk_info tpi;
+ int hdr_len;
+ bool csum_err = false;
- if (!pskb_may_pull(skb, 16))
+ if (parse_gre_header(skb, &tpi, &csum_err, &hdr_len) < 0)
goto drop;
- iph = ip_hdr(skb);
- h = skb->data;
- flags = *(__be16 *)h;
-
- if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
- /* - Version must be 0.
- - We do not support routing headers.
- */
- if (flags&(GRE_VERSION|GRE_ROUTING))
- goto drop;
-
- if (flags&GRE_CSUM) {
- switch (skb->ip_summed) {
- case CHECKSUM_COMPLETE:
- csum = csum_fold(skb->csum);
- if (!csum)
- break;
- /* fall through */
- case CHECKSUM_NONE:
- skb->csum = 0;
- csum = __skb_checksum_complete(skb);
- skb->ip_summed = CHECKSUM_COMPLETE;
- }
- offset += 4;
- }
- if (flags&GRE_KEY) {
- key = *(__be32 *)(h + offset);
- offset += 4;
- }
- if (flags&GRE_SEQ) {
- seqno = ntohl(*(__be32 *)(h + offset));
- offset += 4;
- }
- }
+ if (tpi.proto == htons(ETH_P_TEB))
+ itn = net_generic(net, gre_tap_net_id);
+ else
+ itn = net_generic(net, ipgre_net_id);
- gre_proto = *(__be16 *)(h + 2);
+ iph = ip_hdr(skb);
+ tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, tpi.flags,
+ iph->saddr, iph->daddr, tpi.key);
- tunnel = ipgre_tunnel_lookup(skb->dev,
- iph->saddr, iph->daddr, flags, key,
- gre_proto);
if (tunnel) {
- struct pcpu_tstats *tstats;
-
- secpath_reset(skb);
-
- skb->protocol = gre_proto;
- /* WCCP version 1 and 2 protocol decoding.
- * - Change protocol to IP
- * - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
- */
- if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
- skb->protocol = htons(ETH_P_IP);
- if ((*(h + offset) & 0xF0) != 0x40)
- offset += 4;
- }
-
- skb->mac_header = skb->network_header;
- __pskb_pull(skb, offset);
- skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
- skb->pkt_type = PACKET_HOST;
-#ifdef CONFIG_NET_IPGRE_BROADCAST
- if (ipv4_is_multicast(iph->daddr)) {
- /* Looped back packet, drop it! */
- if (rt_is_output_route(skb_rtable(skb)))
- goto drop;
- tunnel->dev->stats.multicast++;
- skb->pkt_type = PACKET_BROADCAST;
- }
-#endif
-
- if (((flags&GRE_CSUM) && csum) ||
- (!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
- tunnel->dev->stats.rx_crc_errors++;
- tunnel->dev->stats.rx_errors++;
- goto drop;
- }
- if (tunnel->parms.i_flags&GRE_SEQ) {
- if (!(flags&GRE_SEQ) ||
- (tunnel->i_seqno && (s32)(seqno - tunnel->i_seqno) < 0)) {
- tunnel->dev->stats.rx_fifo_errors++;
- tunnel->dev->stats.rx_errors++;
- goto drop;
- }
- tunnel->i_seqno = seqno + 1;
- }
-
- /* Warning: All skb pointers will be invalidated! */
- if (tunnel->dev->type == ARPHRD_ETHER) {
- if (!pskb_may_pull(skb, ETH_HLEN)) {
- tunnel->dev->stats.rx_length_errors++;
- tunnel->dev->stats.rx_errors++;
- goto drop;
- }
-
- iph = ip_hdr(skb);
- skb->protocol = eth_type_trans(skb, tunnel->dev);
- skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
- }
-
- __skb_tunnel_rx(skb, tunnel->dev);
-
- skb_reset_network_header(skb);
- err = IP_ECN_decapsulate(iph, skb);
- if (unlikely(err)) {
- if (log_ecn_error)
- net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
- &iph->saddr, iph->tos);
- if (err > 1) {
- ++tunnel->dev->stats.rx_frame_errors;
- ++tunnel->dev->stats.rx_errors;
- goto drop;
- }
- }
-
- tstats = this_cpu_ptr(tunnel->dev->tstats);
- u64_stats_update_begin(&tstats->syncp);
- tstats->rx_packets++;
- tstats->rx_bytes += skb->len;
- u64_stats_update_end(&tstats->syncp);
-
- gro_cells_receive(&tunnel->gro_cells, skb);
+ ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
return 0;
}
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-
drop:
kfree_skb(skb);
return 0;
skb_shinfo(skb)->gso_type |= SKB_GSO_GRE;
return skb;
} else if (skb->ip_summed == CHECKSUM_PARTIAL &&
- tunnel->parms.o_flags&GRE_CSUM) {
+ tunnel->parms.o_flags&TUNNEL_CSUM) {
err = skb_checksum_help(skb);
if (unlikely(err))
goto error;
return ERR_PTR(err);
}
-static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
+static struct sk_buff *gre_build_header(struct sk_buff *skb,
+ const struct tnl_ptk_info *tpi,
+ int hdr_len)
{
- struct ip_tunnel *tunnel = netdev_priv(dev);
- const struct iphdr *old_iph;
- const struct iphdr *tiph;
- struct flowi4 fl4;
- u8 tos;
- __be16 df;
- struct rtable *rt; /* Route to the other host */
- struct net_device *tdev; /* Device to other host */
- struct iphdr *iph; /* Our new IP header */
- unsigned int max_headroom; /* The extra header space needed */
- int gre_hlen;
- __be32 dst;
- int mtu;
- u8 ttl;
- int err;
-
- skb = handle_offloads(tunnel, skb);
- if (IS_ERR(skb)) {
- dev->stats.tx_dropped++;
- return NETDEV_TX_OK;
- }
+ struct gre_base_hdr *greh;
- if (!skb->encapsulation) {
- skb_reset_inner_headers(skb);
- skb->encapsulation = 1;
- }
+ skb_push(skb, hdr_len);
- old_iph = ip_hdr(skb);
+ greh = (struct gre_base_hdr *)skb->data;
+ greh->flags = tnl_flags_to_gre_flags(tpi->flags);
+ greh->protocol = tpi->proto;
- if (dev->type == ARPHRD_ETHER)
- IPCB(skb)->flags = 0;
+ if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) {
+ __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
- if (dev->header_ops && dev->type == ARPHRD_IPGRE) {
- gre_hlen = 0;
- tiph = (const struct iphdr *)skb->data;
- } else {
- gre_hlen = tunnel->hlen;
- tiph = &tunnel->parms.iph;
- }
-
- if ((dst = tiph->daddr) == 0) {
- /* NBMA tunnel */
-
- if (skb_dst(skb) == NULL) {
- dev->stats.tx_fifo_errors++;
- goto tx_error;
+ if (tpi->flags&TUNNEL_SEQ) {
+ *ptr = tpi->seq;
+ ptr--;
}
-
- if (skb->protocol == htons(ETH_P_IP)) {
- rt = skb_rtable(skb);
- dst = rt_nexthop(rt, old_iph->daddr);
+ if (tpi->flags&TUNNEL_KEY) {
+ *ptr = tpi->key;
+ ptr--;
}
-#if IS_ENABLED(CONFIG_IPV6)
- else if (skb->protocol == htons(ETH_P_IPV6)) {
- const struct in6_addr *addr6;
- struct neighbour *neigh;
- bool do_tx_error_icmp;
- int addr_type;
-
- neigh = dst_neigh_lookup(skb_dst(skb), &ipv6_hdr(skb)->daddr);
- if (neigh == NULL)
- goto tx_error;
-
- addr6 = (const struct in6_addr *)&neigh->primary_key;
- addr_type = ipv6_addr_type(addr6);
-
- if (addr_type == IPV6_ADDR_ANY) {
- addr6 = &ipv6_hdr(skb)->daddr;
- addr_type = ipv6_addr_type(addr6);
- }
-
- if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
- do_tx_error_icmp = true;
- else {
- do_tx_error_icmp = false;
- dst = addr6->s6_addr32[3];
- }
- neigh_release(neigh);
- if (do_tx_error_icmp)
- goto tx_error_icmp;
+ if (tpi->flags&TUNNEL_CSUM &&
+ !(skb_shinfo(skb)->gso_type & SKB_GSO_GRE)) {
+ *(__sum16 *)ptr = 0;
+ *(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0,
+ skb->len, 0));
}
-#endif
- else
- goto tx_error;
}
- ttl = tiph->ttl;
- tos = tiph->tos;
- if (tos & 0x1) {
- tos &= ~0x1;
- if (skb->protocol == htons(ETH_P_IP))
- tos = old_iph->tos;
- else if (skb->protocol == htons(ETH_P_IPV6))
- tos = ipv6_get_dsfield((const struct ipv6hdr *)old_iph);
- }
+ return skb;
+}
- rt = ip_route_output_gre(dev_net(dev), &fl4, dst, tiph->saddr,
- tunnel->parms.o_key, RT_TOS(tos),
- tunnel->parms.link);
- if (IS_ERR(rt)) {
- dev->stats.tx_carrier_errors++;
- goto tx_error;
- }
- tdev = rt->dst.dev;
+static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
+ const struct iphdr *tnl_params,
+ __be16 proto)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct tnl_ptk_info tpi;
- if (tdev == dev) {
- ip_rt_put(rt);
- dev->stats.collisions++;
- goto tx_error;
+ if (likely(!skb->encapsulation)) {
+ skb_reset_inner_headers(skb);
+ skb->encapsulation = 1;
}
- df = tiph->frag_off;
- if (df)
- mtu = dst_mtu(&rt->dst) - dev->hard_header_len - tunnel->hlen;
- else
- mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
-
- if (skb_dst(skb))
- skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
-
- if (skb->protocol == htons(ETH_P_IP)) {
- df |= (old_iph->frag_off&htons(IP_DF));
+ tpi.flags = tunnel->parms.o_flags;
+ tpi.proto = proto;
+ tpi.key = tunnel->parms.o_key;
+ if (tunnel->parms.o_flags & TUNNEL_SEQ)
+ tunnel->o_seqno++;
+ tpi.seq = htonl(tunnel->o_seqno);
- if (!skb_is_gso(skb) &&
- (old_iph->frag_off&htons(IP_DF)) &&
- mtu < ntohs(old_iph->tot_len)) {
- icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
- ip_rt_put(rt);
- goto tx_error;
- }
+ /* Push GRE header. */
+ skb = gre_build_header(skb, &tpi, tunnel->hlen);
+ if (unlikely(!skb)) {
+ dev->stats.tx_dropped++;
+ return;
}
-#if IS_ENABLED(CONFIG_IPV6)
- else if (skb->protocol == htons(ETH_P_IPV6)) {
- struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
-
- if (rt6 && mtu < dst_mtu(skb_dst(skb)) && mtu >= IPV6_MIN_MTU) {
- if ((tunnel->parms.iph.daddr &&
- !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
- rt6->rt6i_dst.plen == 128) {
- rt6->rt6i_flags |= RTF_MODIFIED;
- dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
- }
- }
- if (!skb_is_gso(skb) &&
- mtu >= IPV6_MIN_MTU &&
- mtu < skb->len - tunnel->hlen + gre_hlen) {
- icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
- ip_rt_put(rt);
- goto tx_error;
- }
- }
-#endif
+ ip_tunnel_xmit(skb, dev, tnl_params);
+}
- if (tunnel->err_count > 0) {
- if (time_before(jiffies,
- tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
- tunnel->err_count--;
+static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ const struct iphdr *tnl_params;
- dst_link_failure(skb);
- } else
- tunnel->err_count = 0;
- }
+ skb = handle_offloads(tunnel, skb);
+ if (IS_ERR(skb))
+ goto out;
- max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->dst.header_len;
-
- if (skb_headroom(skb) < max_headroom || skb_shared(skb)||
- (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
- struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
- if (max_headroom > dev->needed_headroom)
- dev->needed_headroom = max_headroom;
- if (!new_skb) {
- ip_rt_put(rt);
- dev->stats.tx_dropped++;
- dev_kfree_skb(skb);
- return NETDEV_TX_OK;
- }
- if (skb->sk)
- skb_set_owner_w(new_skb, skb->sk);
- dev_kfree_skb(skb);
- skb = new_skb;
- old_iph = ip_hdr(skb);
- /* Warning : tiph value might point to freed memory */
- }
+ if (dev->header_ops) {
+ /* Need space for new headers */
+ if (skb_cow_head(skb, dev->needed_headroom -
+ (tunnel->hlen + sizeof(struct iphdr))));
+ goto free_skb;
- skb_push(skb, gre_hlen);
- skb_reset_network_header(skb);
- skb_set_transport_header(skb, sizeof(*iph));
- memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
- IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
- IPSKB_REROUTED);
- skb_dst_drop(skb);
- skb_dst_set(skb, &rt->dst);
-
- /*
- * Push down and install the IPIP header.
- */
+ tnl_params = (const struct iphdr *)skb->data;
- iph = ip_hdr(skb);
- iph->version = 4;
- iph->ihl = sizeof(struct iphdr) >> 2;
- iph->frag_off = df;
- iph->protocol = IPPROTO_GRE;
- iph->tos = ipgre_ecn_encapsulate(tos, old_iph, skb);
- iph->daddr = fl4.daddr;
- iph->saddr = fl4.saddr;
- iph->ttl = ttl;
-
- tunnel_ip_select_ident(skb, old_iph, &rt->dst);
-
- if (ttl == 0) {
- if (skb->protocol == htons(ETH_P_IP))
- iph->ttl = old_iph->ttl;
-#if IS_ENABLED(CONFIG_IPV6)
- else if (skb->protocol == htons(ETH_P_IPV6))
- iph->ttl = ((const struct ipv6hdr *)old_iph)->hop_limit;
-#endif
- else
- iph->ttl = ip4_dst_hoplimit(&rt->dst);
- }
-
- ((__be16 *)(iph + 1))[0] = tunnel->parms.o_flags;
- ((__be16 *)(iph + 1))[1] = (dev->type == ARPHRD_ETHER) ?
- htons(ETH_P_TEB) : skb->protocol;
-
- if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
- __be32 *ptr = (__be32 *)(((u8 *)iph) + tunnel->hlen - 4);
+ /* Pull skb since ip_tunnel_xmit() needs skb->data pointing
+ * to gre header.
+ */
+ skb_pull(skb, tunnel->hlen + sizeof(struct iphdr));
+ } else {
+ if (skb_cow_head(skb, dev->needed_headroom))
+ goto free_skb;
- if (tunnel->parms.o_flags&GRE_SEQ) {
- ++tunnel->o_seqno;
- *ptr = htonl(tunnel->o_seqno);
- ptr--;
- }
- if (tunnel->parms.o_flags&GRE_KEY) {
- *ptr = tunnel->parms.o_key;
- ptr--;
- }
- /* Skip GRE checksum if skb is getting offloaded. */
- if (!(skb_shinfo(skb)->gso_type & SKB_GSO_GRE) &&
- (tunnel->parms.o_flags&GRE_CSUM)) {
- int offset = skb_transport_offset(skb);
-
- if (skb_has_shared_frag(skb)) {
- err = __skb_linearize(skb);
- if (err)
- goto tx_error;
- }
-
- *ptr = 0;
- *(__sum16 *)ptr = csum_fold(skb_checksum(skb, offset,
- skb->len - offset,
- 0));
- }
+ tnl_params = &tunnel->parms.iph;
}
- iptunnel_xmit(skb, dev);
+ __gre_xmit(skb, dev, tnl_params, skb->protocol);
+
return NETDEV_TX_OK;
-#if IS_ENABLED(CONFIG_IPV6)
-tx_error_icmp:
- dst_link_failure(skb);
-#endif
-tx_error:
- dev->stats.tx_errors++;
+free_skb:
dev_kfree_skb(skb);
+out:
+ dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
-static int ipgre_tunnel_bind_dev(struct net_device *dev)
+static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
+ struct net_device *dev)
{
- struct net_device *tdev = NULL;
- struct ip_tunnel *tunnel;
- const struct iphdr *iph;
- int hlen = LL_MAX_HEADER;
- int mtu = ETH_DATA_LEN;
- int addend = sizeof(struct iphdr) + 4;
-
- tunnel = netdev_priv(dev);
- iph = &tunnel->parms.iph;
-
- /* Guess output device to choose reasonable mtu and needed_headroom */
-
- if (iph->daddr) {
- struct flowi4 fl4;
- struct rtable *rt;
-
- rt = ip_route_output_gre(dev_net(dev), &fl4,
- iph->daddr, iph->saddr,
- tunnel->parms.o_key,
- RT_TOS(iph->tos),
- tunnel->parms.link);
- if (!IS_ERR(rt)) {
- tdev = rt->dst.dev;
- ip_rt_put(rt);
- }
-
- if (dev->type != ARPHRD_ETHER)
- dev->flags |= IFF_POINTOPOINT;
- }
+ struct ip_tunnel *tunnel = netdev_priv(dev);
- if (!tdev && tunnel->parms.link)
- tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
+ skb = handle_offloads(tunnel, skb);
+ if (IS_ERR(skb))
+ goto out;
- if (tdev) {
- hlen = tdev->hard_header_len + tdev->needed_headroom;
- mtu = tdev->mtu;
- }
- dev->iflink = tunnel->parms.link;
-
- /* Precalculate GRE options length */
- if (tunnel->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
- if (tunnel->parms.o_flags&GRE_CSUM)
- addend += 4;
- if (tunnel->parms.o_flags&GRE_KEY)
- addend += 4;
- if (tunnel->parms.o_flags&GRE_SEQ)
- addend += 4;
- }
- dev->needed_headroom = addend + hlen;
- mtu -= dev->hard_header_len + addend;
+ if (skb_cow_head(skb, dev->needed_headroom))
+ goto free_skb;
- if (mtu < 68)
- mtu = 68;
+ __gre_xmit(skb, dev, &tunnel->parms.iph, htons(ETH_P_TEB));
- tunnel->hlen = addend;
- /* TCP offload with GRE SEQ is not supported. */
- if (!(tunnel->parms.o_flags & GRE_SEQ)) {
- dev->features |= NETIF_F_GSO_SOFTWARE;
- dev->hw_features |= NETIF_F_GSO_SOFTWARE;
- }
+ return NETDEV_TX_OK;
- return mtu;
+free_skb:
+ dev_kfree_skb(skb);
+out:
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
}
-static int
-ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
+static int ipgre_tunnel_ioctl(struct net_device *dev,
+ struct ifreq *ifr, int cmd)
{
int err = 0;
struct ip_tunnel_parm p;
- struct ip_tunnel *t;
- struct net *net = dev_net(dev);
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
-
- switch (cmd) {
- case SIOCGETTUNNEL:
- t = NULL;
- if (dev == ign->fb_tunnel_dev) {
- if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
- err = -EFAULT;
- break;
- }
- t = ipgre_tunnel_locate(net, &p, 0);
- }
- if (t == NULL)
- t = netdev_priv(dev);
- memcpy(&p, &t->parms, sizeof(p));
- if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
- err = -EFAULT;
- break;
-
- case SIOCADDTUNNEL:
- case SIOCCHGTUNNEL:
- err = -EPERM;
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
- goto done;
-
- err = -EFAULT;
- if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
- goto done;
-
- err = -EINVAL;
- if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
- p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) ||
- ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING)))
- goto done;
- if (p.iph.ttl)
- p.iph.frag_off |= htons(IP_DF);
-
- if (!(p.i_flags&GRE_KEY))
- p.i_key = 0;
- if (!(p.o_flags&GRE_KEY))
- p.o_key = 0;
-
- t = ipgre_tunnel_locate(net, &p, cmd == SIOCADDTUNNEL);
-
- if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
- if (t != NULL) {
- if (t->dev != dev) {
- err = -EEXIST;
- break;
- }
- } else {
- unsigned int nflags = 0;
-
- t = netdev_priv(dev);
-
- if (ipv4_is_multicast(p.iph.daddr))
- nflags = IFF_BROADCAST;
- else if (p.iph.daddr)
- nflags = IFF_POINTOPOINT;
-
- if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
- err = -EINVAL;
- break;
- }
- ipgre_tunnel_unlink(ign, t);
- synchronize_net();
- t->parms.iph.saddr = p.iph.saddr;
- t->parms.iph.daddr = p.iph.daddr;
- t->parms.i_key = p.i_key;
- t->parms.o_key = p.o_key;
- memcpy(dev->dev_addr, &p.iph.saddr, 4);
- memcpy(dev->broadcast, &p.iph.daddr, 4);
- ipgre_tunnel_link(ign, t);
- netdev_state_change(dev);
- }
- }
- if (t) {
- err = 0;
- if (cmd == SIOCCHGTUNNEL) {
- t->parms.iph.ttl = p.iph.ttl;
- t->parms.iph.tos = p.iph.tos;
- t->parms.iph.frag_off = p.iph.frag_off;
- if (t->parms.link != p.link) {
- t->parms.link = p.link;
- dev->mtu = ipgre_tunnel_bind_dev(dev);
- netdev_state_change(dev);
- }
- }
- if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
- err = -EFAULT;
- } else
- err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
- break;
-
- case SIOCDELTUNNEL:
- err = -EPERM;
- if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
- goto done;
-
- if (dev == ign->fb_tunnel_dev) {
- err = -EFAULT;
- if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
- goto done;
- err = -ENOENT;
- if ((t = ipgre_tunnel_locate(net, &p, 0)) == NULL)
- goto done;
- err = -EPERM;
- if (t == netdev_priv(ign->fb_tunnel_dev))
- goto done;
- dev = t->dev;
- }
- unregister_netdevice(dev);
- err = 0;
- break;
-
- default:
- err = -EINVAL;
+ if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
+ return -EFAULT;
+ if (p.iph.version != 4 || p.iph.protocol != IPPROTO_GRE ||
+ p.iph.ihl != 5 || (p.iph.frag_off&htons(~IP_DF)) ||
+ ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))) {
+ return -EINVAL;
}
+ p.i_flags = gre_flags_to_tnl_flags(p.i_flags);
+ p.o_flags = gre_flags_to_tnl_flags(p.o_flags);
-done:
- return err;
-}
+ err = ip_tunnel_ioctl(dev, &p, cmd);
+ if (err)
+ return err;
-static int ipgre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
-{
- struct ip_tunnel *tunnel = netdev_priv(dev);
- if (new_mtu < 68 ||
- new_mtu > 0xFFF8 - dev->hard_header_len - tunnel->hlen)
- return -EINVAL;
- dev->mtu = new_mtu;
+ p.i_flags = tnl_flags_to_gre_flags(p.i_flags);
+ p.o_flags = tnl_flags_to_gre_flags(p.o_flags);
+
+ if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
+ return -EFAULT;
return 0;
}
...
ftp fec0:6666:6666::193.233.7.65
...
-
*/
-
static int ipgre_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type,
const void *daddr, const void *saddr, unsigned int len)
{
struct ip_tunnel *t = netdev_priv(dev);
- struct iphdr *iph = (struct iphdr *)skb_push(skb, t->hlen);
- __be16 *p = (__be16 *)(iph+1);
+ struct iphdr *iph;
+ struct gre_base_hdr *greh;
- memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
- p[0] = t->parms.o_flags;
- p[1] = htons(type);
+ iph = (struct iphdr *)skb_push(skb, t->hlen + sizeof(*iph));
+ greh = (struct gre_base_hdr *)(iph+1);
+ greh->flags = tnl_flags_to_gre_flags(t->parms.o_flags);
+ greh->protocol = htons(type);
- /*
- * Set the source hardware address.
- */
+ memcpy(iph, &t->parms.iph, sizeof(struct iphdr));
+ /* Set the source hardware address. */
if (saddr)
memcpy(&iph->saddr, saddr, 4);
if (daddr)
if (iph->daddr)
return t->hlen;
- return -t->hlen;
+ return -(t->hlen + sizeof(*iph));
}
static int ipgre_header_parse(const struct sk_buff *skb, unsigned char *haddr)
}
return 0;
}
-
#endif
static const struct net_device_ops ipgre_netdev_ops = {
.ndo_init = ipgre_tunnel_init,
- .ndo_uninit = ipgre_tunnel_uninit,
+ .ndo_uninit = ip_tunnel_uninit,
#ifdef CONFIG_NET_IPGRE_BROADCAST
.ndo_open = ipgre_open,
.ndo_stop = ipgre_close,
#endif
- .ndo_start_xmit = ipgre_tunnel_xmit,
+ .ndo_start_xmit = ipgre_xmit,
.ndo_do_ioctl = ipgre_tunnel_ioctl,
- .ndo_change_mtu = ipgre_tunnel_change_mtu,
- .ndo_get_stats64 = ipgre_get_stats64,
+ .ndo_change_mtu = ip_tunnel_change_mtu,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
};
-static void ipgre_dev_free(struct net_device *dev)
-{
- struct ip_tunnel *tunnel = netdev_priv(dev);
-
- gro_cells_destroy(&tunnel->gro_cells);
- free_percpu(dev->tstats);
- free_netdev(dev);
-}
-
#define GRE_FEATURES (NETIF_F_SG | \
NETIF_F_FRAGLIST | \
NETIF_F_HIGHDMA | \
static void ipgre_tunnel_setup(struct net_device *dev)
{
dev->netdev_ops = &ipgre_netdev_ops;
- dev->destructor = ipgre_dev_free;
+ ip_tunnel_setup(dev, ipgre_net_id);
+}
- dev->type = ARPHRD_IPGRE;
- dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4;
+static void __gre_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel;
+
+ tunnel = netdev_priv(dev);
+ tunnel->hlen = ip_gre_calc_hlen(tunnel->parms.o_flags);
+ tunnel->parms.iph.protocol = IPPROTO_GRE;
+
+ dev->needed_headroom = LL_MAX_HEADER + sizeof(struct iphdr) + 4;
dev->mtu = ETH_DATA_LEN - sizeof(struct iphdr) - 4;
- dev->flags = IFF_NOARP;
dev->iflink = 0;
- dev->addr_len = 4;
- dev->features |= NETIF_F_NETNS_LOCAL;
- dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
- dev->features |= GRE_FEATURES;
+ dev->features |= NETIF_F_NETNS_LOCAL | GRE_FEATURES;
dev->hw_features |= GRE_FEATURES;
+
+ if (!(tunnel->parms.o_flags & TUNNEL_SEQ)) {
+ /* TCP offload with GRE SEQ is not supported. */
+ dev->features |= NETIF_F_GSO_SOFTWARE;
+ dev->hw_features |= NETIF_F_GSO_SOFTWARE;
+ /* Can use a lockless transmit, unless we generate
+ * output sequences
+ */
+ dev->features |= NETIF_F_LLTX;
+ }
}
static int ipgre_tunnel_init(struct net_device *dev)
{
- struct ip_tunnel *tunnel;
- struct iphdr *iph;
- int err;
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct iphdr *iph = &tunnel->parms.iph;
- tunnel = netdev_priv(dev);
- iph = &tunnel->parms.iph;
+ __gre_tunnel_init(dev);
- tunnel->dev = dev;
- strcpy(tunnel->parms.name, dev->name);
+ memcpy(dev->dev_addr, &iph->saddr, 4);
+ memcpy(dev->broadcast, &iph->daddr, 4);
- memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4);
- memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4);
+ dev->type = ARPHRD_IPGRE;
+ dev->flags = IFF_NOARP;
+ dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+ dev->addr_len = 4;
if (iph->daddr) {
#ifdef CONFIG_NET_IPGRE_BROADCAST
} else
dev->header_ops = &ipgre_header_ops;
- dev->tstats = alloc_percpu(struct pcpu_tstats);
- if (!dev->tstats)
- return -ENOMEM;
-
- err = gro_cells_init(&tunnel->gro_cells, dev);
- if (err) {
- free_percpu(dev->tstats);
- return err;
- }
-
- return 0;
+ return ip_tunnel_init(dev);
}
-static void ipgre_fb_tunnel_init(struct net_device *dev)
-{
- struct ip_tunnel *tunnel = netdev_priv(dev);
- struct iphdr *iph = &tunnel->parms.iph;
-
- tunnel->dev = dev;
- strcpy(tunnel->parms.name, dev->name);
-
- iph->version = 4;
- iph->protocol = IPPROTO_GRE;
- iph->ihl = 5;
- tunnel->hlen = sizeof(struct iphdr) + 4;
-
- dev_hold(dev);
-}
-
-
static const struct gre_protocol ipgre_protocol = {
.handler = ipgre_rcv,
.err_handler = ipgre_err,
};
-static void ipgre_destroy_tunnels(struct ipgre_net *ign, struct list_head *head)
-{
- int prio;
-
- for (prio = 0; prio < 4; prio++) {
- int h;
- for (h = 0; h < HASH_SIZE; h++) {
- struct ip_tunnel *t;
-
- t = rtnl_dereference(ign->tunnels[prio][h]);
-
- while (t != NULL) {
- unregister_netdevice_queue(t->dev, head);
- t = rtnl_dereference(t->next);
- }
- }
- }
-}
-
static int __net_init ipgre_init_net(struct net *net)
{
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
- int err;
-
- ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip_tunnel), "gre0",
- ipgre_tunnel_setup);
- if (!ign->fb_tunnel_dev) {
- err = -ENOMEM;
- goto err_alloc_dev;
- }
- dev_net_set(ign->fb_tunnel_dev, net);
-
- ipgre_fb_tunnel_init(ign->fb_tunnel_dev);
- ign->fb_tunnel_dev->rtnl_link_ops = &ipgre_link_ops;
-
- if ((err = register_netdev(ign->fb_tunnel_dev)))
- goto err_reg_dev;
-
- rcu_assign_pointer(ign->tunnels_wc[0],
- netdev_priv(ign->fb_tunnel_dev));
- return 0;
-
-err_reg_dev:
- ipgre_dev_free(ign->fb_tunnel_dev);
-err_alloc_dev:
- return err;
+ return ip_tunnel_init_net(net, ipgre_net_id, &ipgre_link_ops, NULL);
}
static void __net_exit ipgre_exit_net(struct net *net)
{
- struct ipgre_net *ign;
- LIST_HEAD(list);
-
- ign = net_generic(net, ipgre_net_id);
- rtnl_lock();
- ipgre_destroy_tunnels(ign, &list);
- unregister_netdevice_many(&list);
- rtnl_unlock();
+ struct ip_tunnel_net *itn = net_generic(net, ipgre_net_id);
+ ip_tunnel_delete_net(itn);
}
static struct pernet_operations ipgre_net_ops = {
.init = ipgre_init_net,
.exit = ipgre_exit_net,
.id = &ipgre_net_id,
- .size = sizeof(struct ipgre_net),
+ .size = sizeof(struct ip_tunnel_net),
};
static int ipgre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
return ipgre_tunnel_validate(tb, data);
}
-static void ipgre_netlink_parms(struct nlattr *data[],
- struct ip_tunnel_parm *parms)
+static void ipgre_netlink_parms(struct nlattr *data[], struct nlattr *tb[],
+ struct ip_tunnel_parm *parms)
{
memset(parms, 0, sizeof(*parms));
parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
if (data[IFLA_GRE_IFLAGS])
- parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
+ parms->i_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_IFLAGS]));
if (data[IFLA_GRE_OFLAGS])
- parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
+ parms->o_flags = gre_flags_to_tnl_flags(nla_get_be16(data[IFLA_GRE_OFLAGS]));
if (data[IFLA_GRE_IKEY])
parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
parms->iph.frag_off = htons(IP_DF);
}
-static int ipgre_tap_init(struct net_device *dev)
+static int gre_tap_init(struct net_device *dev)
{
- struct ip_tunnel *tunnel;
-
- tunnel = netdev_priv(dev);
-
- tunnel->dev = dev;
- strcpy(tunnel->parms.name, dev->name);
-
- ipgre_tunnel_bind_dev(dev);
+ __gre_tunnel_init(dev);
- dev->tstats = alloc_percpu(struct pcpu_tstats);
- if (!dev->tstats)
- return -ENOMEM;
-
- return 0;
+ return ip_tunnel_init(dev);
}
-static const struct net_device_ops ipgre_tap_netdev_ops = {
- .ndo_init = ipgre_tap_init,
- .ndo_uninit = ipgre_tunnel_uninit,
- .ndo_start_xmit = ipgre_tunnel_xmit,
+static const struct net_device_ops gre_tap_netdev_ops = {
+ .ndo_init = gre_tap_init,
+ .ndo_uninit = ip_tunnel_uninit,
+ .ndo_start_xmit = gre_tap_xmit,
.ndo_set_mac_address = eth_mac_addr,
.ndo_validate_addr = eth_validate_addr,
- .ndo_change_mtu = ipgre_tunnel_change_mtu,
- .ndo_get_stats64 = ipgre_get_stats64,
+ .ndo_change_mtu = ip_tunnel_change_mtu,
+ .ndo_get_stats64 = ip_tunnel_get_stats64,
};
static void ipgre_tap_setup(struct net_device *dev)
{
-
ether_setup(dev);
-
- dev->netdev_ops = &ipgre_tap_netdev_ops;
- dev->destructor = ipgre_dev_free;
-
- dev->iflink = 0;
- dev->features |= NETIF_F_NETNS_LOCAL;
-
- dev->features |= GRE_FEATURES;
- dev->hw_features |= GRE_FEATURES;
+ dev->netdev_ops = &gre_tap_netdev_ops;
+ ip_tunnel_setup(dev, gre_tap_net_id);
}
-static int ipgre_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[],
- struct nlattr *data[])
+static int ipgre_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
{
- struct ip_tunnel *nt;
- struct net *net = dev_net(dev);
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
- int mtu;
- int err;
-
- nt = netdev_priv(dev);
- ipgre_netlink_parms(data, &nt->parms);
-
- if (ipgre_tunnel_find(net, &nt->parms, dev->type))
- return -EEXIST;
-
- if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
- eth_hw_addr_random(dev);
-
- mtu = ipgre_tunnel_bind_dev(dev);
- if (!tb[IFLA_MTU])
- dev->mtu = mtu;
-
- /* Can use a lockless transmit, unless we generate output sequences */
- if (!(nt->parms.o_flags & GRE_SEQ))
- dev->features |= NETIF_F_LLTX;
-
- err = register_netdevice(dev);
- if (err)
- goto out;
-
- dev_hold(dev);
- ipgre_tunnel_link(ign, nt);
+ struct ip_tunnel_parm p;
-out:
- return err;
+ ipgre_netlink_parms(data, tb, &p);
+ return ip_tunnel_newlink(dev, tb, &p);
}
static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[])
{
- struct ip_tunnel *t, *nt;
- struct net *net = dev_net(dev);
- struct ipgre_net *ign = net_generic(net, ipgre_net_id);
struct ip_tunnel_parm p;
- int mtu;
-
- if (dev == ign->fb_tunnel_dev)
- return -EINVAL;
-
- nt = netdev_priv(dev);
- ipgre_netlink_parms(data, &p);
-
- t = ipgre_tunnel_locate(net, &p, 0);
-
- if (t) {
- if (t->dev != dev)
- return -EEXIST;
- } else {
- t = nt;
-
- if (dev->type != ARPHRD_ETHER) {
- unsigned int nflags = 0;
-
- if (ipv4_is_multicast(p.iph.daddr))
- nflags = IFF_BROADCAST;
- else if (p.iph.daddr)
- nflags = IFF_POINTOPOINT;
-
- if ((dev->flags ^ nflags) &
- (IFF_POINTOPOINT | IFF_BROADCAST))
- return -EINVAL;
- }
- ipgre_tunnel_unlink(ign, t);
- t->parms.iph.saddr = p.iph.saddr;
- t->parms.iph.daddr = p.iph.daddr;
- t->parms.i_key = p.i_key;
- if (dev->type != ARPHRD_ETHER) {
- memcpy(dev->dev_addr, &p.iph.saddr, 4);
- memcpy(dev->broadcast, &p.iph.daddr, 4);
- }
- ipgre_tunnel_link(ign, t);
- netdev_state_change(dev);
- }
-
- t->parms.o_key = p.o_key;
- t->parms.iph.ttl = p.iph.ttl;
- t->parms.iph.tos = p.iph.tos;
- t->parms.iph.frag_off = p.iph.frag_off;
-
- if (t->parms.link != p.link) {
- t->parms.link = p.link;
- mtu = ipgre_tunnel_bind_dev(dev);
- if (!tb[IFLA_MTU])
- dev->mtu = mtu;
- netdev_state_change(dev);
- }
-
- return 0;
+ ipgre_netlink_parms(data, tb, &p);
+ return ip_tunnel_changelink(dev, tb, &p);
}
static size_t ipgre_get_size(const struct net_device *dev)
struct ip_tunnel_parm *p = &t->parms;
if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
- nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
- nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
+ nla_put_be16(skb, IFLA_GRE_IFLAGS, tnl_flags_to_gre_flags(p->i_flags)) ||
+ nla_put_be16(skb, IFLA_GRE_OFLAGS, tnl_flags_to_gre_flags(p->o_flags)) ||
nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
nla_put_be32(skb, IFLA_GRE_LOCAL, p->iph.saddr) ||
.validate = ipgre_tunnel_validate,
.newlink = ipgre_newlink,
.changelink = ipgre_changelink,
+ .dellink = ip_tunnel_dellink,
.get_size = ipgre_get_size,
.fill_info = ipgre_fill_info,
};
.validate = ipgre_tap_validate,
.newlink = ipgre_newlink,
.changelink = ipgre_changelink,
+ .dellink = ip_tunnel_dellink,
.get_size = ipgre_get_size,
.fill_info = ipgre_fill_info,
};
-/*
- * And now the modules code and kernel interface.
- */
+static int __net_init ipgre_tap_init_net(struct net *net)
+{
+ return ip_tunnel_init_net(net, gre_tap_net_id, &ipgre_tap_ops, NULL);
+}
+
+static void __net_exit ipgre_tap_exit_net(struct net *net)
+{
+ struct ip_tunnel_net *itn = net_generic(net, gre_tap_net_id);
+ ip_tunnel_delete_net(itn);
+}
+
+static struct pernet_operations ipgre_tap_net_ops = {
+ .init = ipgre_tap_init_net,
+ .exit = ipgre_tap_exit_net,
+ .id = &gre_tap_net_id,
+ .size = sizeof(struct ip_tunnel_net),
+};
static int __init ipgre_init(void)
{
if (err < 0)
return err;
+ err = register_pernet_device(&ipgre_tap_net_ops);
+ if (err < 0)
+ goto pnet_tap_faied;
+
err = gre_add_protocol(&ipgre_protocol, GREPROTO_CISCO);
if (err < 0) {
pr_info("%s: can't add protocol\n", __func__);
if (err < 0)
goto tap_ops_failed;
-out:
- return err;
+ return 0;
tap_ops_failed:
rtnl_link_unregister(&ipgre_link_ops);
rtnl_link_failed:
gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO);
add_proto_failed:
+ unregister_pernet_device(&ipgre_tap_net_ops);
+pnet_tap_faied:
unregister_pernet_device(&ipgre_net_ops);
- goto out;
+ return err;
}
static void __exit ipgre_fini(void)
rtnl_link_unregister(&ipgre_link_ops);
if (gre_del_protocol(&ipgre_protocol, GREPROTO_CISCO) < 0)
pr_info("%s: can't remove protocol\n", __func__);
+ unregister_pernet_device(&ipgre_tap_net_ops);
unregister_pernet_device(&ipgre_net_ops);
}
MODULE_ALIAS_RTNL_LINK("gre");
MODULE_ALIAS_RTNL_LINK("gretap");
MODULE_ALIAS_NETDEV("gre0");
+MODULE_ALIAS_NETDEV("gretap0");
--- /dev/null
+/*
+ * Copyright (c) 2013 Nicira, Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/capability.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/in.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/if_arp.h>
+#include <linux/mroute.h>
+#include <linux/init.h>
+#include <linux/in6.h>
+#include <linux/inetdevice.h>
+#include <linux/igmp.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+#include <linux/rculist.h>
+
+#include <net/sock.h>
+#include <net/ip.h>
+#include <net/icmp.h>
+#include <net/protocol.h>
+#include <net/ip_tunnels.h>
+#include <net/arp.h>
+#include <net/checksum.h>
+#include <net/dsfield.h>
+#include <net/inet_ecn.h>
+#include <net/xfrm.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include <net/rtnetlink.h>
+
+#if IS_ENABLED(CONFIG_IPV6)
+#include <net/ipv6.h>
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+#endif
+
+static unsigned int ip_tunnel_hash(struct ip_tunnel_net *itn,
+ __be32 key, __be32 remote)
+{
+ return hash_32((__force u32)key ^ (__force u32)remote,
+ IP_TNL_HASH_BITS);
+}
+
+/* Often modified stats are per cpu, other are shared (netdev->stats) */
+struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
+ struct rtnl_link_stats64 *tot)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ const struct pcpu_tstats *tstats = per_cpu_ptr(dev->tstats, i);
+ u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
+ unsigned int start;
+
+ do {
+ start = u64_stats_fetch_begin_bh(&tstats->syncp);
+ rx_packets = tstats->rx_packets;
+ tx_packets = tstats->tx_packets;
+ rx_bytes = tstats->rx_bytes;
+ tx_bytes = tstats->tx_bytes;
+ } while (u64_stats_fetch_retry_bh(&tstats->syncp, start));
+
+ tot->rx_packets += rx_packets;
+ tot->tx_packets += tx_packets;
+ tot->rx_bytes += rx_bytes;
+ tot->tx_bytes += tx_bytes;
+ }
+
+ tot->multicast = dev->stats.multicast;
+
+ tot->rx_crc_errors = dev->stats.rx_crc_errors;
+ tot->rx_fifo_errors = dev->stats.rx_fifo_errors;
+ tot->rx_length_errors = dev->stats.rx_length_errors;
+ tot->rx_frame_errors = dev->stats.rx_frame_errors;
+ tot->rx_errors = dev->stats.rx_errors;
+
+ tot->tx_fifo_errors = dev->stats.tx_fifo_errors;
+ tot->tx_carrier_errors = dev->stats.tx_carrier_errors;
+ tot->tx_dropped = dev->stats.tx_dropped;
+ tot->tx_aborted_errors = dev->stats.tx_aborted_errors;
+ tot->tx_errors = dev->stats.tx_errors;
+
+ tot->collisions = dev->stats.collisions;
+
+ return tot;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
+
+static bool ip_tunnel_key_match(const struct ip_tunnel_parm *p,
+ __be16 flags, __be32 key)
+{
+ if (p->i_flags & TUNNEL_KEY) {
+ if (flags & TUNNEL_KEY)
+ return key == p->i_key;
+ else
+ /* key expected, none present */
+ return false;
+ } else
+ return !(flags & TUNNEL_KEY);
+}
+
+/* Fallback tunnel: no source, no destination, no key, no options
+
+ Tunnel hash table:
+ We require exact key match i.e. if a key is present in packet
+ it will match only tunnel with the same key; if it is not present,
+ it will match only keyless tunnel.
+
+ All keysless packets, if not matched configured keyless tunnels
+ will match fallback tunnel.
+ Given src, dst and key, find appropriate for input tunnel.
+*/
+struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
+ int link, __be16 flags,
+ __be32 remote, __be32 local,
+ __be32 key)
+{
+ unsigned int hash;
+ struct ip_tunnel *t, *cand = NULL;
+ struct hlist_head *head;
+
+ hash = ip_tunnel_hash(itn, key, remote);
+ head = &itn->tunnels[hash];
+
+ hlist_for_each_entry_rcu(t, head, hash_node) {
+ if (local != t->parms.iph.saddr ||
+ remote != t->parms.iph.daddr ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (!ip_tunnel_key_match(&t->parms, flags, key))
+ continue;
+
+ if (t->parms.link == link)
+ return t;
+ else
+ cand = t;
+ }
+
+ hlist_for_each_entry_rcu(t, head, hash_node) {
+ if (remote != t->parms.iph.daddr ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (!ip_tunnel_key_match(&t->parms, flags, key))
+ continue;
+
+ if (t->parms.link == link)
+ return t;
+ else if (!cand)
+ cand = t;
+ }
+
+ hash = ip_tunnel_hash(itn, key, 0);
+ head = &itn->tunnels[hash];
+
+ hlist_for_each_entry_rcu(t, head, hash_node) {
+ if ((local != t->parms.iph.saddr &&
+ (local != t->parms.iph.daddr ||
+ !ipv4_is_multicast(local))) ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (!ip_tunnel_key_match(&t->parms, flags, key))
+ continue;
+
+ if (t->parms.link == link)
+ return t;
+ else if (!cand)
+ cand = t;
+ }
+
+ if (flags & TUNNEL_NO_KEY)
+ goto skip_key_lookup;
+
+ hlist_for_each_entry_rcu(t, head, hash_node) {
+ if (t->parms.i_key != key ||
+ !(t->dev->flags & IFF_UP))
+ continue;
+
+ if (t->parms.link == link)
+ return t;
+ else if (!cand)
+ cand = t;
+ }
+
+skip_key_lookup:
+ if (cand)
+ return cand;
+
+ if (itn->fb_tunnel_dev && itn->fb_tunnel_dev->flags & IFF_UP)
+ return netdev_priv(itn->fb_tunnel_dev);
+
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_lookup);
+
+static struct hlist_head *ip_bucket(struct ip_tunnel_net *itn,
+ struct ip_tunnel_parm *parms)
+{
+ unsigned int h;
+ __be32 remote;
+
+ if (parms->iph.daddr && !ipv4_is_multicast(parms->iph.daddr))
+ remote = parms->iph.daddr;
+ else
+ remote = 0;
+
+ h = ip_tunnel_hash(itn, parms->i_key, remote);
+ return &itn->tunnels[h];
+}
+
+static void ip_tunnel_add(struct ip_tunnel_net *itn, struct ip_tunnel *t)
+{
+ struct hlist_head *head = ip_bucket(itn, &t->parms);
+
+ hlist_add_head_rcu(&t->hash_node, head);
+}
+
+static void ip_tunnel_del(struct ip_tunnel *t)
+{
+ hlist_del_init_rcu(&t->hash_node);
+}
+
+static struct ip_tunnel *ip_tunnel_find(struct ip_tunnel_net *itn,
+ struct ip_tunnel_parm *parms,
+ int type)
+{
+ __be32 remote = parms->iph.daddr;
+ __be32 local = parms->iph.saddr;
+ __be32 key = parms->i_key;
+ int link = parms->link;
+ struct ip_tunnel *t = NULL;
+ struct hlist_head *head = ip_bucket(itn, parms);
+
+ hlist_for_each_entry_rcu(t, head, hash_node) {
+ if (local == t->parms.iph.saddr &&
+ remote == t->parms.iph.daddr &&
+ key == t->parms.i_key &&
+ link == t->parms.link &&
+ type == t->dev->type)
+ break;
+ }
+ return t;
+}
+
+static struct net_device *__ip_tunnel_create(struct net *net,
+ const struct rtnl_link_ops *ops,
+ struct ip_tunnel_parm *parms)
+{
+ int err;
+ struct ip_tunnel *tunnel;
+ struct net_device *dev;
+ char name[IFNAMSIZ];
+
+ if (parms->name[0])
+ strlcpy(name, parms->name, IFNAMSIZ);
+ else {
+ if (strlen(ops->kind) + 3 >= IFNAMSIZ) {
+ err = -E2BIG;
+ goto failed;
+ }
+ strlcpy(name, ops->kind, IFNAMSIZ);
+ strncat(name, "%d", 2);
+ }
+
+ ASSERT_RTNL();
+ dev = alloc_netdev(ops->priv_size, name, ops->setup);
+ if (!dev) {
+ err = -ENOMEM;
+ goto failed;
+ }
+ dev_net_set(dev, net);
+
+ dev->rtnl_link_ops = ops;
+
+ tunnel = netdev_priv(dev);
+ tunnel->parms = *parms;
+
+ err = register_netdevice(dev);
+ if (err)
+ goto failed_free;
+
+ return dev;
+
+failed_free:
+ free_netdev(dev);
+failed:
+ return ERR_PTR(err);
+}
+
+static inline struct rtable *ip_route_output_tunnel(struct net *net,
+ struct flowi4 *fl4,
+ int proto,
+ __be32 daddr, __be32 saddr,
+ __be32 key, __u8 tos, int oif)
+{
+ memset(fl4, 0, sizeof(*fl4));
+ fl4->flowi4_oif = oif;
+ fl4->daddr = daddr;
+ fl4->saddr = saddr;
+ fl4->flowi4_tos = tos;
+ fl4->flowi4_proto = proto;
+ fl4->fl4_gre_key = key;
+ return ip_route_output_key(net, fl4);
+}
+
+static int ip_tunnel_bind_dev(struct net_device *dev)
+{
+ struct net_device *tdev = NULL;
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ const struct iphdr *iph;
+ int hlen = LL_MAX_HEADER;
+ int mtu = ETH_DATA_LEN;
+ int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+
+ iph = &tunnel->parms.iph;
+
+ /* Guess output device to choose reasonable mtu and needed_headroom */
+ if (iph->daddr) {
+ struct flowi4 fl4;
+ struct rtable *rt;
+
+ rt = ip_route_output_tunnel(dev_net(dev), &fl4,
+ tunnel->parms.iph.protocol,
+ iph->daddr, iph->saddr,
+ tunnel->parms.o_key,
+ RT_TOS(iph->tos),
+ tunnel->parms.link);
+ if (!IS_ERR(rt)) {
+ tdev = rt->dst.dev;
+ ip_rt_put(rt);
+ }
+ if (dev->type != ARPHRD_ETHER)
+ dev->flags |= IFF_POINTOPOINT;
+ }
+
+ if (!tdev && tunnel->parms.link)
+ tdev = __dev_get_by_index(dev_net(dev), tunnel->parms.link);
+
+ if (tdev) {
+ hlen = tdev->hard_header_len + tdev->needed_headroom;
+ mtu = tdev->mtu;
+ }
+ dev->iflink = tunnel->parms.link;
+
+ dev->needed_headroom = t_hlen + hlen;
+ mtu -= (dev->hard_header_len + t_hlen);
+
+ if (mtu < 68)
+ mtu = 68;
+
+ return mtu;
+}
+
+static struct ip_tunnel *ip_tunnel_create(struct net *net,
+ struct ip_tunnel_net *itn,
+ struct ip_tunnel_parm *parms)
+{
+ struct ip_tunnel *nt, *fbt;
+ struct net_device *dev;
+
+ BUG_ON(!itn->fb_tunnel_dev);
+ fbt = netdev_priv(itn->fb_tunnel_dev);
+ dev = __ip_tunnel_create(net, itn->fb_tunnel_dev->rtnl_link_ops, parms);
+ if (IS_ERR(dev))
+ return NULL;
+
+ dev->mtu = ip_tunnel_bind_dev(dev);
+
+ nt = netdev_priv(dev);
+ ip_tunnel_add(itn, nt);
+ return nt;
+}
+
+int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
+ const struct tnl_ptk_info *tpi, bool log_ecn_error)
+{
+ struct pcpu_tstats *tstats;
+ const struct iphdr *iph = ip_hdr(skb);
+ int err;
+
+ secpath_reset(skb);
+
+ skb->protocol = tpi->proto;
+
+ skb->mac_header = skb->network_header;
+ __pskb_pull(skb, tunnel->hlen);
+ skb_postpull_rcsum(skb, skb_transport_header(skb), tunnel->hlen);
+#ifdef CONFIG_NET_IPGRE_BROADCAST
+ if (ipv4_is_multicast(iph->daddr)) {
+ /* Looped back packet, drop it! */
+ if (rt_is_output_route(skb_rtable(skb)))
+ goto drop;
+ tunnel->dev->stats.multicast++;
+ skb->pkt_type = PACKET_BROADCAST;
+ }
+#endif
+
+ if ((!(tpi->flags&TUNNEL_CSUM) && (tunnel->parms.i_flags&TUNNEL_CSUM)) ||
+ ((tpi->flags&TUNNEL_CSUM) && !(tunnel->parms.i_flags&TUNNEL_CSUM))) {
+ tunnel->dev->stats.rx_crc_errors++;
+ tunnel->dev->stats.rx_errors++;
+ goto drop;
+ }
+
+ if (tunnel->parms.i_flags&TUNNEL_SEQ) {
+ if (!(tpi->flags&TUNNEL_SEQ) ||
+ (tunnel->i_seqno && (s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
+ tunnel->dev->stats.rx_fifo_errors++;
+ tunnel->dev->stats.rx_errors++;
+ goto drop;
+ }
+ tunnel->i_seqno = ntohl(tpi->seq) + 1;
+ }
+
+ /* Warning: All skb pointers will be invalidated! */
+ if (tunnel->dev->type == ARPHRD_ETHER) {
+ if (!pskb_may_pull(skb, ETH_HLEN)) {
+ tunnel->dev->stats.rx_length_errors++;
+ tunnel->dev->stats.rx_errors++;
+ goto drop;
+ }
+
+ iph = ip_hdr(skb);
+ skb->protocol = eth_type_trans(skb, tunnel->dev);
+ skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
+ }
+
+ skb->pkt_type = PACKET_HOST;
+ __skb_tunnel_rx(skb, tunnel->dev);
+
+ skb_reset_network_header(skb);
+ err = IP_ECN_decapsulate(iph, skb);
+ if (unlikely(err)) {
+ if (log_ecn_error)
+ net_info_ratelimited("non-ECT from %pI4 with TOS=%#x\n",
+ &iph->saddr, iph->tos);
+ if (err > 1) {
+ ++tunnel->dev->stats.rx_frame_errors;
+ ++tunnel->dev->stats.rx_errors;
+ goto drop;
+ }
+ }
+
+ tstats = this_cpu_ptr(tunnel->dev->tstats);
+ u64_stats_update_begin(&tstats->syncp);
+ tstats->rx_packets++;
+ tstats->rx_bytes += skb->len;
+ u64_stats_update_end(&tstats->syncp);
+
+ gro_cells_receive(&tunnel->gro_cells, skb);
+ return 0;
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
+
+void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
+ const struct iphdr *tnl_params)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ const struct iphdr *inner_iph;
+ struct iphdr *iph;
+ struct flowi4 fl4;
+ u8 tos, ttl;
+ __be16 df;
+ struct rtable *rt; /* Route to the other host */
+ struct net_device *tdev; /* Device to other host */
+ unsigned int max_headroom; /* The extra header space needed */
+ __be32 dst;
+ int mtu;
+
+ inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
+
+ dst = tnl_params->daddr;
+ if (dst == 0) {
+ /* NBMA tunnel */
+
+ if (skb_dst(skb) == NULL) {
+ dev->stats.tx_fifo_errors++;
+ goto tx_error;
+ }
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ rt = skb_rtable(skb);
+ dst = rt_nexthop(rt, inner_iph->daddr);
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (skb->protocol == htons(ETH_P_IPV6)) {
+ const struct in6_addr *addr6;
+ struct neighbour *neigh;
+ bool do_tx_error_icmp;
+ int addr_type;
+
+ neigh = dst_neigh_lookup(skb_dst(skb),
+ &ipv6_hdr(skb)->daddr);
+ if (neigh == NULL)
+ goto tx_error;
+
+ addr6 = (const struct in6_addr *)&neigh->primary_key;
+ addr_type = ipv6_addr_type(addr6);
+
+ if (addr_type == IPV6_ADDR_ANY) {
+ addr6 = &ipv6_hdr(skb)->daddr;
+ addr_type = ipv6_addr_type(addr6);
+ }
+
+ if ((addr_type & IPV6_ADDR_COMPATv4) == 0)
+ do_tx_error_icmp = true;
+ else {
+ do_tx_error_icmp = false;
+ dst = addr6->s6_addr32[3];
+ }
+ neigh_release(neigh);
+ if (do_tx_error_icmp)
+ goto tx_error_icmp;
+ }
+#endif
+ else
+ goto tx_error;
+ }
+
+ tos = tnl_params->tos;
+ if (tos & 0x1) {
+ tos &= ~0x1;
+ if (skb->protocol == htons(ETH_P_IP))
+ tos = inner_iph->tos;
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ tos = ipv6_get_dsfield((const struct ipv6hdr *)inner_iph);
+ }
+
+ rt = ip_route_output_tunnel(dev_net(dev), &fl4,
+ tunnel->parms.iph.protocol,
+ dst, tnl_params->saddr,
+ tunnel->parms.o_key,
+ RT_TOS(tos),
+ tunnel->parms.link);
+ if (IS_ERR(rt)) {
+ dev->stats.tx_carrier_errors++;
+ goto tx_error;
+ }
+ tdev = rt->dst.dev;
+
+ if (tdev == dev) {
+ ip_rt_put(rt);
+ dev->stats.collisions++;
+ goto tx_error;
+ }
+
+ df = tnl_params->frag_off;
+
+ if (df)
+ mtu = dst_mtu(&rt->dst) - dev->hard_header_len
+ - sizeof(struct iphdr);
+ else
+ mtu = skb_dst(skb) ? dst_mtu(skb_dst(skb)) : dev->mtu;
+
+ if (skb_dst(skb))
+ skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ df |= (inner_iph->frag_off&htons(IP_DF));
+
+ if (!skb_is_gso(skb) &&
+ (inner_iph->frag_off&htons(IP_DF)) &&
+ mtu < ntohs(inner_iph->tot_len)) {
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (skb->protocol == htons(ETH_P_IPV6)) {
+ struct rt6_info *rt6 = (struct rt6_info *)skb_dst(skb);
+
+ if (rt6 && mtu < dst_mtu(skb_dst(skb)) &&
+ mtu >= IPV6_MIN_MTU) {
+ if ((tunnel->parms.iph.daddr &&
+ !ipv4_is_multicast(tunnel->parms.iph.daddr)) ||
+ rt6->rt6i_dst.plen == 128) {
+ rt6->rt6i_flags |= RTF_MODIFIED;
+ dst_metric_set(skb_dst(skb), RTAX_MTU, mtu);
+ }
+ }
+
+ if (!skb_is_gso(skb) && mtu >= IPV6_MIN_MTU &&
+ mtu < skb->len) {
+ icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
+ ip_rt_put(rt);
+ goto tx_error;
+ }
+ }
+#endif
+
+ if (tunnel->err_count > 0) {
+ if (time_before(jiffies,
+ tunnel->err_time + IPTUNNEL_ERR_TIMEO)) {
+ tunnel->err_count--;
+
+ dst_link_failure(skb);
+ } else
+ tunnel->err_count = 0;
+ }
+
+ ttl = tnl_params->ttl;
+ if (ttl == 0) {
+ if (skb->protocol == htons(ETH_P_IP))
+ ttl = inner_iph->ttl;
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (skb->protocol == htons(ETH_P_IPV6))
+ ttl = ((const struct ipv6hdr *)inner_iph)->hop_limit;
+#endif
+ else
+ ttl = ip4_dst_hoplimit(&rt->dst);
+ }
+
+ max_headroom = LL_RESERVED_SPACE(tdev) + sizeof(struct iphdr)
+ + rt->dst.header_len;
+ if (max_headroom > dev->needed_headroom) {
+ dev->needed_headroom = max_headroom;
+ if (skb_cow_head(skb, dev->needed_headroom)) {
+ dev->stats.tx_dropped++;
+ dev_kfree_skb(skb);
+ return;
+ }
+ }
+
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &rt->dst);
+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+
+ /* Push down and install the IP header. */
+ skb_push(skb, sizeof(struct iphdr));
+ skb_reset_network_header(skb);
+
+ iph = ip_hdr(skb);
+ inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
+
+ iph->version = 4;
+ iph->ihl = sizeof(struct iphdr) >> 2;
+ iph->frag_off = df;
+ iph->protocol = tnl_params->protocol;
+ iph->tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
+ iph->daddr = fl4.daddr;
+ iph->saddr = fl4.saddr;
+ iph->ttl = ttl;
+ tunnel_ip_select_ident(skb, inner_iph, &rt->dst);
+
+ iptunnel_xmit(skb, dev);
+ return;
+
+#if IS_ENABLED(CONFIG_IPV6)
+tx_error_icmp:
+ dst_link_failure(skb);
+#endif
+tx_error:
+ dev->stats.tx_errors++;
+ dev_kfree_skb(skb);
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_xmit);
+
+static void ip_tunnel_update(struct ip_tunnel_net *itn,
+ struct ip_tunnel *t,
+ struct net_device *dev,
+ struct ip_tunnel_parm *p,
+ bool set_mtu)
+{
+ ip_tunnel_del(t);
+ t->parms.iph.saddr = p->iph.saddr;
+ t->parms.iph.daddr = p->iph.daddr;
+ t->parms.i_key = p->i_key;
+ t->parms.o_key = p->o_key;
+ if (dev->type != ARPHRD_ETHER) {
+ memcpy(dev->dev_addr, &p->iph.saddr, 4);
+ memcpy(dev->broadcast, &p->iph.daddr, 4);
+ }
+ ip_tunnel_add(itn, t);
+
+ t->parms.iph.ttl = p->iph.ttl;
+ t->parms.iph.tos = p->iph.tos;
+ t->parms.iph.frag_off = p->iph.frag_off;
+
+ if (t->parms.link != p->link) {
+ int mtu;
+
+ t->parms.link = p->link;
+ mtu = ip_tunnel_bind_dev(dev);
+ if (set_mtu)
+ dev->mtu = mtu;
+ }
+ netdev_state_change(dev);
+}
+
+int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
+{
+ int err = 0;
+ struct ip_tunnel *t;
+ struct net *net = dev_net(dev);
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
+
+ BUG_ON(!itn->fb_tunnel_dev);
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ t = NULL;
+ if (dev == itn->fb_tunnel_dev)
+ t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
+ if (t == NULL)
+ t = netdev_priv(dev);
+ memcpy(p, &t->parms, sizeof(*p));
+ break;
+
+ case SIOCADDTUNNEL:
+ case SIOCCHGTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+ if (p->iph.ttl)
+ p->iph.frag_off |= htons(IP_DF);
+ if (!(p->i_flags&TUNNEL_KEY))
+ p->i_key = 0;
+ if (!(p->o_flags&TUNNEL_KEY))
+ p->o_key = 0;
+
+ t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
+
+ if (!t && (cmd == SIOCADDTUNNEL))
+ t = ip_tunnel_create(net, itn, p);
+
+ if (dev != itn->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
+ if (t != NULL) {
+ if (t->dev != dev) {
+ err = -EEXIST;
+ break;
+ }
+ } else {
+ unsigned int nflags = 0;
+
+ if (ipv4_is_multicast(p->iph.daddr))
+ nflags = IFF_BROADCAST;
+ else if (p->iph.daddr)
+ nflags = IFF_POINTOPOINT;
+
+ if ((dev->flags^nflags)&(IFF_POINTOPOINT|IFF_BROADCAST)) {
+ err = -EINVAL;
+ break;
+ }
+
+ t = netdev_priv(dev);
+ }
+ }
+
+ if (t) {
+ err = 0;
+ ip_tunnel_update(itn, t, dev, p, true);
+ } else
+ err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
+ break;
+
+ case SIOCDELTUNNEL:
+ err = -EPERM;
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ goto done;
+
+ if (dev == itn->fb_tunnel_dev) {
+ err = -ENOENT;
+ t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
+ if (t == NULL)
+ goto done;
+ err = -EPERM;
+ if (t == netdev_priv(itn->fb_tunnel_dev))
+ goto done;
+ dev = t->dev;
+ }
+ unregister_netdevice(dev);
+ err = 0;
+ break;
+
+ default:
+ err = -EINVAL;
+ }
+
+done:
+ return err;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
+
+int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+
+ if (new_mtu < 68 ||
+ new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
+ return -EINVAL;
+ dev->mtu = new_mtu;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
+
+static void ip_tunnel_dev_free(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+
+ gro_cells_destroy(&tunnel->gro_cells);
+ free_percpu(dev->tstats);
+ free_netdev(dev);
+}
+
+void ip_tunnel_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct net *net = dev_net(dev);
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct ip_tunnel_net *itn;
+
+ itn = net_generic(net, tunnel->ip_tnl_net_id);
+
+ if (itn->fb_tunnel_dev != dev) {
+ ip_tunnel_del(netdev_priv(dev));
+ unregister_netdevice_queue(dev, head);
+ }
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_dellink);
+
+int __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
+ struct rtnl_link_ops *ops, char *devname)
+{
+ struct ip_tunnel_net *itn = net_generic(net, ip_tnl_net_id);
+ struct ip_tunnel_parm parms;
+
+ itn->tunnels = kzalloc(IP_TNL_HASH_SIZE * sizeof(struct hlist_head), GFP_KERNEL);
+ if (!itn->tunnels)
+ return -ENOMEM;
+
+ if (!ops) {
+ itn->fb_tunnel_dev = NULL;
+ return 0;
+ }
+ memset(&parms, 0, sizeof(parms));
+ if (devname)
+ strlcpy(parms.name, devname, IFNAMSIZ);
+
+ rtnl_lock();
+ itn->fb_tunnel_dev = __ip_tunnel_create(net, ops, &parms);
+ rtnl_unlock();
+ if (IS_ERR(itn->fb_tunnel_dev)) {
+ kfree(itn->tunnels);
+ return PTR_ERR(itn->fb_tunnel_dev);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_init_net);
+
+static void ip_tunnel_destroy(struct ip_tunnel_net *itn, struct list_head *head)
+{
+ int h;
+
+ for (h = 0; h < IP_TNL_HASH_SIZE; h++) {
+ struct ip_tunnel *t;
+ struct hlist_node *n;
+ struct hlist_head *thead = &itn->tunnels[h];
+
+ hlist_for_each_entry_safe(t, n, thead, hash_node)
+ unregister_netdevice_queue(t->dev, head);
+ }
+ if (itn->fb_tunnel_dev)
+ unregister_netdevice_queue(itn->fb_tunnel_dev, head);
+}
+
+void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn)
+{
+ LIST_HEAD(list);
+
+ rtnl_lock();
+ ip_tunnel_destroy(itn, &list);
+ unregister_netdevice_many(&list);
+ rtnl_unlock();
+ kfree(itn->tunnels);
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_delete_net);
+
+int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
+ struct ip_tunnel_parm *p)
+{
+ struct ip_tunnel *nt;
+ struct net *net = dev_net(dev);
+ struct ip_tunnel_net *itn;
+ int mtu;
+ int err;
+
+ nt = netdev_priv(dev);
+ itn = net_generic(net, nt->ip_tnl_net_id);
+
+ if (ip_tunnel_find(itn, p, dev->type))
+ return -EEXIST;
+
+ nt->parms = *p;
+ err = register_netdevice(dev);
+ if (err)
+ goto out;
+
+ if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
+ eth_hw_addr_random(dev);
+
+ mtu = ip_tunnel_bind_dev(dev);
+ if (!tb[IFLA_MTU])
+ dev->mtu = mtu;
+
+ ip_tunnel_add(itn, nt);
+
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_newlink);
+
+int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
+ struct ip_tunnel_parm *p)
+{
+ struct ip_tunnel *t, *nt;
+ struct net *net = dev_net(dev);
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct ip_tunnel_net *itn = net_generic(net, tunnel->ip_tnl_net_id);
+
+ if (dev == itn->fb_tunnel_dev)
+ return -EINVAL;
+
+ nt = netdev_priv(dev);
+
+ t = ip_tunnel_find(itn, p, dev->type);
+
+ if (t) {
+ if (t->dev != dev)
+ return -EEXIST;
+ } else {
+ t = nt;
+
+ if (dev->type != ARPHRD_ETHER) {
+ unsigned int nflags = 0;
+
+ if (ipv4_is_multicast(p->iph.daddr))
+ nflags = IFF_BROADCAST;
+ else if (p->iph.daddr)
+ nflags = IFF_POINTOPOINT;
+
+ if ((dev->flags ^ nflags) &
+ (IFF_POINTOPOINT | IFF_BROADCAST))
+ return -EINVAL;
+ }
+ }
+
+ ip_tunnel_update(itn, t, dev, p, !tb[IFLA_MTU]);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_changelink);
+
+int ip_tunnel_init(struct net_device *dev)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct iphdr *iph = &tunnel->parms.iph;
+ int err;
+
+ dev->destructor = ip_tunnel_dev_free;
+ dev->tstats = alloc_percpu(struct pcpu_tstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ err = gro_cells_init(&tunnel->gro_cells, dev);
+ if (err) {
+ free_percpu(dev->tstats);
+ return err;
+ }
+
+ tunnel->dev = dev;
+ strcpy(tunnel->parms.name, dev->name);
+ iph->version = 4;
+ iph->ihl = 5;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_init);
+
+void ip_tunnel_uninit(struct net_device *dev)
+{
+ struct net *net = dev_net(dev);
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ struct ip_tunnel_net *itn;
+
+ itn = net_generic(net, tunnel->ip_tnl_net_id);
+ /* fb_tunnel_dev will be unregisted in net-exit call. */
+ if (itn->fb_tunnel_dev != dev)
+ ip_tunnel_del(netdev_priv(dev));
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_uninit);
+
+/* Do least required initialization, rest of init is done in tunnel_init call */
+void ip_tunnel_setup(struct net_device *dev, int net_id)
+{
+ struct ip_tunnel *tunnel = netdev_priv(dev);
+ tunnel->ip_tnl_net_id = net_id;
+}
+EXPORT_SYMBOL_GPL(ip_tunnel_setup);
+
+MODULE_LICENSE("GPL");
projects / ~andy / linux / commitdiff