1003 lines
21 KiB
C
1003 lines
21 KiB
C
#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <net/genetlink.h>
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#include <net/gue.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.h>
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#include <net/xfrm.h>
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#include <uapi/linux/fou.h>
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#include <uapi/linux/genetlink.h>
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struct fou {
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struct socket *sock;
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u8 protocol;
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u8 flags;
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__be16 port;
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u16 type;
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struct udp_offload udp_offloads;
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struct list_head list;
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struct rcu_head rcu;
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};
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#define FOU_F_REMCSUM_NOPARTIAL BIT(0)
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struct fou_cfg {
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u16 type;
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u8 protocol;
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u8 flags;
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struct udp_port_cfg udp_config;
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};
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static unsigned int fou_net_id;
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struct fou_net {
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struct list_head fou_list;
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struct mutex fou_lock;
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};
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static inline struct fou *fou_from_sock(struct sock *sk)
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{
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return sk->sk_user_data;
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}
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static int fou_recv_pull(struct sk_buff *skb, size_t len)
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{
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struct iphdr *iph = ip_hdr(skb);
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/* Remove 'len' bytes from the packet (UDP header and
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* FOU header if present).
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*/
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iph->tot_len = htons(ntohs(iph->tot_len) - len);
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__skb_pull(skb, len);
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skb_postpull_rcsum(skb, udp_hdr(skb), len);
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skb_reset_transport_header(skb);
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return iptunnel_pull_offloads(skb);
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}
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static int fou_udp_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct fou *fou = fou_from_sock(sk);
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if (!fou)
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return 1;
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if (fou_recv_pull(skb, sizeof(struct udphdr)))
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goto drop;
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return -fou->protocol;
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drop:
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kfree_skb(skb);
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return 0;
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}
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static struct guehdr *gue_remcsum(struct sk_buff *skb, struct guehdr *guehdr,
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void *data, size_t hdrlen, u8 ipproto,
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bool nopartial)
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{
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__be16 *pd = data;
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size_t start = ntohs(pd[0]);
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size_t offset = ntohs(pd[1]);
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size_t plen = sizeof(struct udphdr) + hdrlen +
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max_t(size_t, offset + sizeof(u16), start);
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if (skb->remcsum_offload)
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return guehdr;
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if (!pskb_may_pull(skb, plen))
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return NULL;
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guehdr = (struct guehdr *)&udp_hdr(skb)[1];
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skb_remcsum_process(skb, (void *)guehdr + hdrlen,
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start, offset, nopartial);
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return guehdr;
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}
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static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr)
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{
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/* No support yet */
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kfree_skb(skb);
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return 0;
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}
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static int gue_udp_recv(struct sock *sk, struct sk_buff *skb)
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{
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struct fou *fou = fou_from_sock(sk);
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size_t len, optlen, hdrlen;
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struct guehdr *guehdr;
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void *data;
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u16 doffset = 0;
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if (!fou)
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return 1;
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len = sizeof(struct udphdr) + sizeof(struct guehdr);
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if (!pskb_may_pull(skb, len))
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goto drop;
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guehdr = (struct guehdr *)&udp_hdr(skb)[1];
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optlen = guehdr->hlen << 2;
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len += optlen;
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if (!pskb_may_pull(skb, len))
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goto drop;
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/* guehdr may change after pull */
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guehdr = (struct guehdr *)&udp_hdr(skb)[1];
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hdrlen = sizeof(struct guehdr) + optlen;
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if (guehdr->version != 0 || validate_gue_flags(guehdr, optlen))
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goto drop;
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hdrlen = sizeof(struct guehdr) + optlen;
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ip_hdr(skb)->tot_len = htons(ntohs(ip_hdr(skb)->tot_len) - len);
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/* Pull csum through the guehdr now . This can be used if
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* there is a remote checksum offload.
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*/
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skb_postpull_rcsum(skb, udp_hdr(skb), len);
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data = &guehdr[1];
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if (guehdr->flags & GUE_FLAG_PRIV) {
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__be32 flags = *(__be32 *)(data + doffset);
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doffset += GUE_LEN_PRIV;
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if (flags & GUE_PFLAG_REMCSUM) {
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guehdr = gue_remcsum(skb, guehdr, data + doffset,
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hdrlen, guehdr->proto_ctype,
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!!(fou->flags &
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FOU_F_REMCSUM_NOPARTIAL));
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if (!guehdr)
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goto drop;
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data = &guehdr[1];
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doffset += GUE_PLEN_REMCSUM;
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}
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}
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if (unlikely(guehdr->control))
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return gue_control_message(skb, guehdr);
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__skb_pull(skb, sizeof(struct udphdr) + hdrlen);
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skb_reset_transport_header(skb);
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if (iptunnel_pull_offloads(skb))
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goto drop;
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return -guehdr->proto_ctype;
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drop:
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kfree_skb(skb);
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return 0;
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}
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static struct sk_buff **fou_gro_receive(struct sk_buff **head,
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struct sk_buff *skb,
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struct udp_offload *uoff)
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{
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const struct net_offload *ops;
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struct sk_buff **pp = NULL;
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u8 proto = NAPI_GRO_CB(skb)->proto;
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const struct net_offload **offloads;
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rcu_read_lock();
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offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
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ops = rcu_dereference(offloads[proto]);
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if (!ops || !ops->callbacks.gro_receive)
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goto out_unlock;
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pp = ops->callbacks.gro_receive(head, skb);
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out_unlock:
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rcu_read_unlock();
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return pp;
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}
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static int fou_gro_complete(struct sk_buff *skb, int nhoff,
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struct udp_offload *uoff)
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{
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const struct net_offload *ops;
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u8 proto = NAPI_GRO_CB(skb)->proto;
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int err = -ENOSYS;
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const struct net_offload **offloads;
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udp_tunnel_gro_complete(skb, nhoff);
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rcu_read_lock();
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offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
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ops = rcu_dereference(offloads[proto]);
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if (WARN_ON(!ops || !ops->callbacks.gro_complete))
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goto out_unlock;
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err = ops->callbacks.gro_complete(skb, nhoff);
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out_unlock:
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rcu_read_unlock();
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return err;
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}
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static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off,
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struct guehdr *guehdr, void *data,
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size_t hdrlen, struct gro_remcsum *grc,
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bool nopartial)
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{
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__be16 *pd = data;
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size_t start = ntohs(pd[0]);
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size_t offset = ntohs(pd[1]);
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if (skb->remcsum_offload)
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return guehdr;
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if (!NAPI_GRO_CB(skb)->csum_valid)
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return NULL;
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guehdr = skb_gro_remcsum_process(skb, (void *)guehdr, off, hdrlen,
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start, offset, grc, nopartial);
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skb->remcsum_offload = 1;
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return guehdr;
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}
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static struct sk_buff **gue_gro_receive(struct sk_buff **head,
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struct sk_buff *skb,
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struct udp_offload *uoff)
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{
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const struct net_offload **offloads;
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const struct net_offload *ops;
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struct sk_buff **pp = NULL;
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struct sk_buff *p;
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struct guehdr *guehdr;
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size_t len, optlen, hdrlen, off;
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void *data;
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u16 doffset = 0;
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int flush = 1;
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struct fou *fou = container_of(uoff, struct fou, udp_offloads);
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struct gro_remcsum grc;
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skb_gro_remcsum_init(&grc);
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off = skb_gro_offset(skb);
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len = off + sizeof(*guehdr);
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guehdr = skb_gro_header_fast(skb, off);
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if (skb_gro_header_hard(skb, len)) {
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guehdr = skb_gro_header_slow(skb, len, off);
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if (unlikely(!guehdr))
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goto out;
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}
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optlen = guehdr->hlen << 2;
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len += optlen;
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if (skb_gro_header_hard(skb, len)) {
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guehdr = skb_gro_header_slow(skb, len, off);
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if (unlikely(!guehdr))
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goto out;
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}
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if (unlikely(guehdr->control) || guehdr->version != 0 ||
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validate_gue_flags(guehdr, optlen))
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goto out;
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hdrlen = sizeof(*guehdr) + optlen;
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/* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr,
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* this is needed if there is a remote checkcsum offload.
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*/
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skb_gro_postpull_rcsum(skb, guehdr, hdrlen);
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data = &guehdr[1];
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if (guehdr->flags & GUE_FLAG_PRIV) {
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__be32 flags = *(__be32 *)(data + doffset);
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doffset += GUE_LEN_PRIV;
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if (flags & GUE_PFLAG_REMCSUM) {
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guehdr = gue_gro_remcsum(skb, off, guehdr,
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data + doffset, hdrlen, &grc,
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!!(fou->flags &
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FOU_F_REMCSUM_NOPARTIAL));
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if (!guehdr)
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goto out;
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data = &guehdr[1];
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doffset += GUE_PLEN_REMCSUM;
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}
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}
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skb_gro_pull(skb, hdrlen);
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for (p = *head; p; p = p->next) {
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const struct guehdr *guehdr2;
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if (!NAPI_GRO_CB(p)->same_flow)
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continue;
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guehdr2 = (struct guehdr *)(p->data + off);
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|
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/* Compare base GUE header to be equal (covers
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* hlen, version, proto_ctype, and flags.
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*/
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if (guehdr->word != guehdr2->word) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
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|
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/* Compare optional fields are the same. */
|
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if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1],
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guehdr->hlen << 2)) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
|
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}
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|
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rcu_read_lock();
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offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
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ops = rcu_dereference(offloads[guehdr->proto_ctype]);
|
|
if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive))
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goto out_unlock;
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|
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pp = ops->callbacks.gro_receive(head, skb);
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flush = 0;
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out_unlock:
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rcu_read_unlock();
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out:
|
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NAPI_GRO_CB(skb)->flush |= flush;
|
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skb_gro_remcsum_cleanup(skb, &grc);
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|
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return pp;
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}
|
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|
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static int gue_gro_complete(struct sk_buff *skb, int nhoff,
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struct udp_offload *uoff)
|
|
{
|
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const struct net_offload **offloads;
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struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff);
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const struct net_offload *ops;
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unsigned int guehlen;
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u8 proto;
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int err = -ENOENT;
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proto = guehdr->proto_ctype;
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guehlen = sizeof(*guehdr) + (guehdr->hlen << 2);
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|
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rcu_read_lock();
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offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
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ops = rcu_dereference(offloads[proto]);
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if (WARN_ON(!ops || !ops->callbacks.gro_complete))
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goto out_unlock;
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err = ops->callbacks.gro_complete(skb, nhoff + guehlen);
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out_unlock:
|
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rcu_read_unlock();
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return err;
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}
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static int fou_add_to_port_list(struct net *net, struct fou *fou)
|
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{
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struct fou_net *fn = net_generic(net, fou_net_id);
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struct fou *fout;
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mutex_lock(&fn->fou_lock);
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list_for_each_entry(fout, &fn->fou_list, list) {
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if (fou->port == fout->port) {
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mutex_unlock(&fn->fou_lock);
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return -EALREADY;
|
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}
|
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}
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list_add(&fou->list, &fn->fou_list);
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mutex_unlock(&fn->fou_lock);
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|
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return 0;
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}
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|
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static void fou_release(struct fou *fou)
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{
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struct socket *sock = fou->sock;
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struct sock *sk = sock->sk;
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if (sk->sk_family == AF_INET)
|
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udp_del_offload(&fou->udp_offloads);
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list_del(&fou->list);
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udp_tunnel_sock_release(sock);
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|
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kfree_rcu(fou, rcu);
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}
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|
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static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg)
|
|
{
|
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udp_sk(sk)->encap_rcv = fou_udp_recv;
|
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fou->protocol = cfg->protocol;
|
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fou->udp_offloads.callbacks.gro_receive = fou_gro_receive;
|
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fou->udp_offloads.callbacks.gro_complete = fou_gro_complete;
|
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fou->udp_offloads.port = cfg->udp_config.local_udp_port;
|
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fou->udp_offloads.ipproto = cfg->protocol;
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|
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return 0;
|
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}
|
|
|
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static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg)
|
|
{
|
|
udp_sk(sk)->encap_rcv = gue_udp_recv;
|
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fou->udp_offloads.callbacks.gro_receive = gue_gro_receive;
|
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fou->udp_offloads.callbacks.gro_complete = gue_gro_complete;
|
|
fou->udp_offloads.port = cfg->udp_config.local_udp_port;
|
|
|
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return 0;
|
|
}
|
|
|
|
static int fou_create(struct net *net, struct fou_cfg *cfg,
|
|
struct socket **sockp)
|
|
{
|
|
struct socket *sock = NULL;
|
|
struct fou *fou = NULL;
|
|
struct sock *sk;
|
|
int err;
|
|
|
|
/* Open UDP socket */
|
|
err = udp_sock_create(net, &cfg->udp_config, &sock);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
/* Allocate FOU port structure */
|
|
fou = kzalloc(sizeof(*fou), GFP_KERNEL);
|
|
if (!fou) {
|
|
err = -ENOMEM;
|
|
goto error;
|
|
}
|
|
|
|
sk = sock->sk;
|
|
|
|
fou->flags = cfg->flags;
|
|
fou->port = cfg->udp_config.local_udp_port;
|
|
|
|
/* Initial for fou type */
|
|
switch (cfg->type) {
|
|
case FOU_ENCAP_DIRECT:
|
|
err = fou_encap_init(sk, fou, cfg);
|
|
if (err)
|
|
goto error;
|
|
break;
|
|
case FOU_ENCAP_GUE:
|
|
err = gue_encap_init(sk, fou, cfg);
|
|
if (err)
|
|
goto error;
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
fou->type = cfg->type;
|
|
|
|
udp_sk(sk)->encap_type = 1;
|
|
udp_encap_enable();
|
|
|
|
sk->sk_user_data = fou;
|
|
fou->sock = sock;
|
|
|
|
inet_inc_convert_csum(sk);
|
|
|
|
sk->sk_allocation = GFP_ATOMIC;
|
|
|
|
if (cfg->udp_config.family == AF_INET) {
|
|
err = udp_add_offload(net, &fou->udp_offloads);
|
|
if (err)
|
|
goto error;
|
|
}
|
|
|
|
err = fou_add_to_port_list(net, fou);
|
|
if (err)
|
|
goto error;
|
|
|
|
if (sockp)
|
|
*sockp = sock;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
kfree(fou);
|
|
if (sock)
|
|
udp_tunnel_sock_release(sock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int fou_destroy(struct net *net, struct fou_cfg *cfg)
|
|
{
|
|
struct fou_net *fn = net_generic(net, fou_net_id);
|
|
__be16 port = cfg->udp_config.local_udp_port;
|
|
int err = -EINVAL;
|
|
struct fou *fou;
|
|
|
|
mutex_lock(&fn->fou_lock);
|
|
list_for_each_entry(fou, &fn->fou_list, list) {
|
|
if (fou->port == port) {
|
|
fou_release(fou);
|
|
err = 0;
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&fn->fou_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct genl_family fou_nl_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.hdrsize = 0,
|
|
.name = FOU_GENL_NAME,
|
|
.version = FOU_GENL_VERSION,
|
|
.maxattr = FOU_ATTR_MAX,
|
|
.netnsok = true,
|
|
};
|
|
|
|
static struct nla_policy fou_nl_policy[FOU_ATTR_MAX + 1] = {
|
|
[FOU_ATTR_PORT] = { .type = NLA_U16, },
|
|
[FOU_ATTR_AF] = { .type = NLA_U8, },
|
|
[FOU_ATTR_IPPROTO] = { .type = NLA_U8, },
|
|
[FOU_ATTR_TYPE] = { .type = NLA_U8, },
|
|
[FOU_ATTR_REMCSUM_NOPARTIAL] = { .type = NLA_FLAG, },
|
|
};
|
|
|
|
static int parse_nl_config(struct genl_info *info,
|
|
struct fou_cfg *cfg)
|
|
{
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
cfg->udp_config.family = AF_INET;
|
|
|
|
if (info->attrs[FOU_ATTR_AF]) {
|
|
u8 family = nla_get_u8(info->attrs[FOU_ATTR_AF]);
|
|
|
|
if (family != AF_INET)
|
|
return -EINVAL;
|
|
|
|
cfg->udp_config.family = family;
|
|
}
|
|
|
|
if (info->attrs[FOU_ATTR_PORT]) {
|
|
__be16 port = nla_get_be16(info->attrs[FOU_ATTR_PORT]);
|
|
|
|
cfg->udp_config.local_udp_port = port;
|
|
}
|
|
|
|
if (info->attrs[FOU_ATTR_IPPROTO])
|
|
cfg->protocol = nla_get_u8(info->attrs[FOU_ATTR_IPPROTO]);
|
|
|
|
if (info->attrs[FOU_ATTR_TYPE])
|
|
cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]);
|
|
|
|
if (info->attrs[FOU_ATTR_REMCSUM_NOPARTIAL])
|
|
cfg->flags |= FOU_F_REMCSUM_NOPARTIAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
struct fou_cfg cfg;
|
|
int err;
|
|
|
|
err = parse_nl_config(info, &cfg);
|
|
if (err)
|
|
return err;
|
|
|
|
return fou_create(net, &cfg, NULL);
|
|
}
|
|
|
|
static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
struct fou_cfg cfg;
|
|
int err;
|
|
|
|
err = parse_nl_config(info, &cfg);
|
|
if (err)
|
|
return err;
|
|
|
|
return fou_destroy(net, &cfg);
|
|
}
|
|
|
|
static int fou_fill_info(struct fou *fou, struct sk_buff *msg)
|
|
{
|
|
if (nla_put_u8(msg, FOU_ATTR_AF, fou->sock->sk->sk_family) ||
|
|
nla_put_be16(msg, FOU_ATTR_PORT, fou->port) ||
|
|
nla_put_u8(msg, FOU_ATTR_IPPROTO, fou->protocol) ||
|
|
nla_put_u8(msg, FOU_ATTR_TYPE, fou->type))
|
|
return -1;
|
|
|
|
if (fou->flags & FOU_F_REMCSUM_NOPARTIAL)
|
|
if (nla_put_flag(msg, FOU_ATTR_REMCSUM_NOPARTIAL))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int fou_dump_info(struct fou *fou, u32 portid, u32 seq,
|
|
u32 flags, struct sk_buff *skb, u8 cmd)
|
|
{
|
|
void *hdr;
|
|
|
|
hdr = genlmsg_put(skb, portid, seq, &fou_nl_family, flags, cmd);
|
|
if (!hdr)
|
|
return -ENOMEM;
|
|
|
|
if (fou_fill_info(fou, skb) < 0)
|
|
goto nla_put_failure;
|
|
|
|
genlmsg_end(skb, hdr);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
genlmsg_cancel(skb, hdr);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int fou_nl_cmd_get_port(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
struct fou_net *fn = net_generic(net, fou_net_id);
|
|
struct sk_buff *msg;
|
|
struct fou_cfg cfg;
|
|
struct fou *fout;
|
|
__be16 port;
|
|
int ret;
|
|
|
|
ret = parse_nl_config(info, &cfg);
|
|
if (ret)
|
|
return ret;
|
|
port = cfg.udp_config.local_udp_port;
|
|
if (port == 0)
|
|
return -EINVAL;
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
ret = -ESRCH;
|
|
mutex_lock(&fn->fou_lock);
|
|
list_for_each_entry(fout, &fn->fou_list, list) {
|
|
if (port == fout->port) {
|
|
ret = fou_dump_info(fout, info->snd_portid,
|
|
info->snd_seq, 0, msg,
|
|
info->genlhdr->cmd);
|
|
break;
|
|
}
|
|
}
|
|
mutex_unlock(&fn->fou_lock);
|
|
if (ret < 0)
|
|
goto out_free;
|
|
|
|
return genlmsg_reply(msg, info);
|
|
|
|
out_free:
|
|
nlmsg_free(msg);
|
|
return ret;
|
|
}
|
|
|
|
static int fou_nl_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct fou_net *fn = net_generic(net, fou_net_id);
|
|
struct fou *fout;
|
|
int idx = 0, ret;
|
|
|
|
mutex_lock(&fn->fou_lock);
|
|
list_for_each_entry(fout, &fn->fou_list, list) {
|
|
if (idx++ < cb->args[0])
|
|
continue;
|
|
ret = fou_dump_info(fout, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI,
|
|
skb, FOU_CMD_GET);
|
|
if (ret)
|
|
break;
|
|
}
|
|
mutex_unlock(&fn->fou_lock);
|
|
|
|
cb->args[0] = idx;
|
|
return skb->len;
|
|
}
|
|
|
|
static const struct genl_ops fou_nl_ops[] = {
|
|
{
|
|
.cmd = FOU_CMD_ADD,
|
|
.doit = fou_nl_cmd_add_port,
|
|
.policy = fou_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = FOU_CMD_DEL,
|
|
.doit = fou_nl_cmd_rm_port,
|
|
.policy = fou_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = FOU_CMD_GET,
|
|
.doit = fou_nl_cmd_get_port,
|
|
.dumpit = fou_nl_dump,
|
|
.policy = fou_nl_policy,
|
|
},
|
|
};
|
|
|
|
size_t fou_encap_hlen(struct ip_tunnel_encap *e)
|
|
{
|
|
return sizeof(struct udphdr);
|
|
}
|
|
EXPORT_SYMBOL(fou_encap_hlen);
|
|
|
|
size_t gue_encap_hlen(struct ip_tunnel_encap *e)
|
|
{
|
|
size_t len;
|
|
bool need_priv = false;
|
|
|
|
len = sizeof(struct udphdr) + sizeof(struct guehdr);
|
|
|
|
if (e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) {
|
|
len += GUE_PLEN_REMCSUM;
|
|
need_priv = true;
|
|
}
|
|
|
|
len += need_priv ? GUE_LEN_PRIV : 0;
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL(gue_encap_hlen);
|
|
|
|
static void fou_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
|
|
struct flowi4 *fl4, u8 *protocol, __be16 sport)
|
|
{
|
|
struct udphdr *uh;
|
|
|
|
skb_push(skb, sizeof(struct udphdr));
|
|
skb_reset_transport_header(skb);
|
|
|
|
uh = udp_hdr(skb);
|
|
|
|
uh->dest = e->dport;
|
|
uh->source = sport;
|
|
uh->len = htons(skb->len);
|
|
udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb,
|
|
fl4->saddr, fl4->daddr, skb->len);
|
|
|
|
*protocol = IPPROTO_UDP;
|
|
}
|
|
|
|
int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
|
|
u8 *protocol, struct flowi4 *fl4)
|
|
{
|
|
int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM :
|
|
SKB_GSO_UDP_TUNNEL;
|
|
__be16 sport;
|
|
|
|
skb = iptunnel_handle_offloads(skb, type);
|
|
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
|
|
skb, 0, 0, false);
|
|
fou_build_udp(skb, e, fl4, protocol, sport);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(fou_build_header);
|
|
|
|
int gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
|
|
u8 *protocol, struct flowi4 *fl4)
|
|
{
|
|
int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM ? SKB_GSO_UDP_TUNNEL_CSUM :
|
|
SKB_GSO_UDP_TUNNEL;
|
|
struct guehdr *guehdr;
|
|
size_t hdrlen, optlen = 0;
|
|
__be16 sport;
|
|
void *data;
|
|
bool need_priv = false;
|
|
|
|
if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) &&
|
|
skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
optlen += GUE_PLEN_REMCSUM;
|
|
type |= SKB_GSO_TUNNEL_REMCSUM;
|
|
need_priv = true;
|
|
}
|
|
|
|
optlen += need_priv ? GUE_LEN_PRIV : 0;
|
|
|
|
skb = iptunnel_handle_offloads(skb, type);
|
|
|
|
if (IS_ERR(skb))
|
|
return PTR_ERR(skb);
|
|
|
|
/* Get source port (based on flow hash) before skb_push */
|
|
sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
|
|
skb, 0, 0, false);
|
|
|
|
hdrlen = sizeof(struct guehdr) + optlen;
|
|
|
|
skb_push(skb, hdrlen);
|
|
|
|
guehdr = (struct guehdr *)skb->data;
|
|
|
|
guehdr->control = 0;
|
|
guehdr->version = 0;
|
|
guehdr->hlen = optlen >> 2;
|
|
guehdr->flags = 0;
|
|
guehdr->proto_ctype = *protocol;
|
|
|
|
data = &guehdr[1];
|
|
|
|
if (need_priv) {
|
|
__be32 *flags = data;
|
|
|
|
guehdr->flags |= GUE_FLAG_PRIV;
|
|
*flags = 0;
|
|
data += GUE_LEN_PRIV;
|
|
|
|
if (type & SKB_GSO_TUNNEL_REMCSUM) {
|
|
u16 csum_start = skb_checksum_start_offset(skb);
|
|
__be16 *pd = data;
|
|
|
|
if (csum_start < hdrlen)
|
|
return -EINVAL;
|
|
|
|
csum_start -= hdrlen;
|
|
pd[0] = htons(csum_start);
|
|
pd[1] = htons(csum_start + skb->csum_offset);
|
|
|
|
if (!skb_is_gso(skb)) {
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
skb->encapsulation = 0;
|
|
}
|
|
|
|
*flags |= GUE_PFLAG_REMCSUM;
|
|
data += GUE_PLEN_REMCSUM;
|
|
}
|
|
|
|
}
|
|
|
|
fou_build_udp(skb, e, fl4, protocol, sport);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(gue_build_header);
|
|
|
|
#ifdef CONFIG_NET_FOU_IP_TUNNELS
|
|
|
|
static const struct ip_tunnel_encap_ops fou_iptun_ops = {
|
|
.encap_hlen = fou_encap_hlen,
|
|
.build_header = fou_build_header,
|
|
};
|
|
|
|
static const struct ip_tunnel_encap_ops gue_iptun_ops = {
|
|
.encap_hlen = gue_encap_hlen,
|
|
.build_header = gue_build_header,
|
|
};
|
|
|
|
static int ip_tunnel_encap_add_fou_ops(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = ip_tunnel_encap_add_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
|
|
if (ret < 0) {
|
|
pr_err("can't add fou ops\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE);
|
|
if (ret < 0) {
|
|
pr_err("can't add gue ops\n");
|
|
ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ip_tunnel_encap_del_fou_ops(void)
|
|
{
|
|
ip_tunnel_encap_del_ops(&fou_iptun_ops, TUNNEL_ENCAP_FOU);
|
|
ip_tunnel_encap_del_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE);
|
|
}
|
|
|
|
#else
|
|
|
|
static int ip_tunnel_encap_add_fou_ops(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void ip_tunnel_encap_del_fou_ops(void)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
static __net_init int fou_init_net(struct net *net)
|
|
{
|
|
struct fou_net *fn = net_generic(net, fou_net_id);
|
|
|
|
INIT_LIST_HEAD(&fn->fou_list);
|
|
mutex_init(&fn->fou_lock);
|
|
return 0;
|
|
}
|
|
|
|
static __net_exit void fou_exit_net(struct net *net)
|
|
{
|
|
struct fou_net *fn = net_generic(net, fou_net_id);
|
|
struct fou *fou, *next;
|
|
|
|
/* Close all the FOU sockets */
|
|
mutex_lock(&fn->fou_lock);
|
|
list_for_each_entry_safe(fou, next, &fn->fou_list, list)
|
|
fou_release(fou);
|
|
mutex_unlock(&fn->fou_lock);
|
|
}
|
|
|
|
static struct pernet_operations fou_net_ops = {
|
|
.init = fou_init_net,
|
|
.exit = fou_exit_net,
|
|
.id = &fou_net_id,
|
|
.size = sizeof(struct fou_net),
|
|
};
|
|
|
|
static int __init fou_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_device(&fou_net_ops);
|
|
if (ret)
|
|
goto exit;
|
|
|
|
ret = genl_register_family_with_ops(&fou_nl_family,
|
|
fou_nl_ops);
|
|
if (ret < 0)
|
|
goto unregister;
|
|
|
|
ret = ip_tunnel_encap_add_fou_ops();
|
|
if (ret == 0)
|
|
return 0;
|
|
|
|
genl_unregister_family(&fou_nl_family);
|
|
unregister:
|
|
unregister_pernet_device(&fou_net_ops);
|
|
exit:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit fou_fini(void)
|
|
{
|
|
ip_tunnel_encap_del_fou_ops();
|
|
genl_unregister_family(&fou_nl_family);
|
|
unregister_pernet_device(&fou_net_ops);
|
|
}
|
|
|
|
module_init(fou_init);
|
|
module_exit(fou_fini);
|
|
MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
|
|
MODULE_LICENSE("GPL");
|