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net/ipv4/fou.c
17.7 KB
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#include <linux/module.h> #include <linux/errno.h> #include <linux/socket.h> #include <linux/skbuff.h> #include <linux/ip.h> #include <linux/udp.h> #include <linux/types.h> #include <linux/kernel.h> #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> #include <net/udp_tunnel.h> #include <net/xfrm.h> #include <uapi/linux/fou.h> #include <uapi/linux/genetlink.h> static DEFINE_SPINLOCK(fou_lock); static LIST_HEAD(fou_list); struct fou { struct socket *sock; u8 protocol; u16 port; |
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struct udp_offload udp_offloads; |
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struct list_head list; }; struct fou_cfg { |
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u16 type; |
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u8 protocol; struct udp_port_cfg udp_config; }; static inline struct fou *fou_from_sock(struct sock *sk) { return sk->sk_user_data; } |
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static void fou_recv_pull(struct sk_buff *skb, size_t len) |
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{ struct iphdr *iph = ip_hdr(skb); /* Remove 'len' bytes from the packet (UDP header and |
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* FOU header if present). |
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*/ iph->tot_len = htons(ntohs(iph->tot_len) - len); __skb_pull(skb, len); skb_postpull_rcsum(skb, udp_hdr(skb), len); skb_reset_transport_header(skb); |
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} static int fou_udp_recv(struct sock *sk, struct sk_buff *skb) { struct fou *fou = fou_from_sock(sk); if (!fou) return 1; |
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fou_recv_pull(skb, sizeof(struct udphdr)); return -fou->protocol; } |
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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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{ __be16 *pd = data; |
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size_t start = ntohs(pd[0]); size_t offset = ntohs(pd[1]); size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); __wsum delta; |
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if (skb->remcsum_offload) { /* Already processed in GRO path */ skb->remcsum_offload = 0; return guehdr; } |
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if (!pskb_may_pull(skb, plen)) return NULL; guehdr = (struct guehdr *)&udp_hdr(skb)[1]; |
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if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) __skb_checksum_complete(skb); |
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delta = remcsum_adjust((void *)guehdr + hdrlen, skb->csum, start, offset); |
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/* Adjust skb->csum since we changed the packet */ skb->csum = csum_add(skb->csum, delta); return guehdr; } |
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static int gue_control_message(struct sk_buff *skb, struct guehdr *guehdr) { /* No support yet */ kfree_skb(skb); return 0; |
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} |
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static int gue_udp_recv(struct sock *sk, struct sk_buff *skb) { 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) return 1; len = sizeof(struct udphdr) + sizeof(struct guehdr); if (!pskb_may_pull(skb, len)) goto drop; |
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guehdr = (struct guehdr *)&udp_hdr(skb)[1]; optlen = guehdr->hlen << 2; len += optlen; |
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if (!pskb_may_pull(skb, len)) goto drop; |
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/* guehdr may change after pull */ 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; 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 * there is a remote checksum offload. */ skb_postpull_rcsum(skb, udp_hdr(skb), len); |
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data = &guehdr[1]; if (guehdr->flags & GUE_FLAG_PRIV) { |
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__be32 flags = *(__be32 *)(data + doffset); doffset += GUE_LEN_PRIV; if (flags & GUE_PFLAG_REMCSUM) { guehdr = gue_remcsum(skb, guehdr, data + doffset, hdrlen, guehdr->proto_ctype); if (!guehdr) goto drop; data = &guehdr[1]; |
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doffset += GUE_PLEN_REMCSUM; } |
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} |
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if (unlikely(guehdr->control)) 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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return -guehdr->proto_ctype; |
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drop: kfree_skb(skb); return 0; } |
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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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{ const struct net_offload *ops; struct sk_buff **pp = NULL; 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]); if (!ops || !ops->callbacks.gro_receive) goto out_unlock; pp = ops->callbacks.gro_receive(head, skb); out_unlock: rcu_read_unlock(); return pp; } |
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static int fou_gro_complete(struct sk_buff *skb, int nhoff) |
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{ const struct net_offload *ops; u8 proto = NAPI_GRO_CB(skb)->proto; 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]); if (WARN_ON(!ops || !ops->callbacks.gro_complete)) goto out_unlock; err = ops->callbacks.gro_complete(skb, nhoff); out_unlock: rcu_read_unlock(); return err; } |
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static struct guehdr *gue_gro_remcsum(struct sk_buff *skb, unsigned int off, struct guehdr *guehdr, void *data, size_t hdrlen, u8 ipproto) { __be16 *pd = data; |
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size_t start = ntohs(pd[0]); size_t offset = ntohs(pd[1]); size_t plen = hdrlen + max_t(size_t, offset + sizeof(u16), start); __wsum delta; |
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if (skb->remcsum_offload) return guehdr; |
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if (!NAPI_GRO_CB(skb)->csum_valid) |
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return NULL; |
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/* Pull checksum that will be written */ if (skb_gro_header_hard(skb, off + plen)) { guehdr = skb_gro_header_slow(skb, off + plen, off); if (!guehdr) return NULL; } |
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delta = remcsum_adjust((void *)guehdr + hdrlen, NAPI_GRO_CB(skb)->csum, start, offset); |
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/* Adjust skb->csum since we changed the packet */ skb->csum = csum_add(skb->csum, delta); NAPI_GRO_CB(skb)->csum = csum_add(NAPI_GRO_CB(skb)->csum, delta); skb->remcsum_offload = 1; return guehdr; } |
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static struct sk_buff **gue_gro_receive(struct sk_buff **head, struct sk_buff *skb) { const struct net_offload **offloads; const struct net_offload *ops; struct sk_buff **pp = NULL; struct sk_buff *p; |
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struct guehdr *guehdr; |
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size_t len, optlen, hdrlen, off; void *data; |
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u16 doffset = 0; |
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int flush = 1; 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)) { guehdr = skb_gro_header_slow(skb, len, off); |
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if (unlikely(!guehdr)) goto out; } |
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optlen = guehdr->hlen << 2; len += optlen; |
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if (skb_gro_header_hard(skb, len)) { guehdr = skb_gro_header_slow(skb, len, off); if (unlikely(!guehdr)) goto out; } |
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if (unlikely(guehdr->control) || guehdr->version != 0 || validate_gue_flags(guehdr, optlen)) goto out; |
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hdrlen = sizeof(*guehdr) + optlen; |
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/* Adjust NAPI_GRO_CB(skb)->csum to account for guehdr, * this is needed if there is a remote checkcsum offload. */ |
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skb_gro_postpull_rcsum(skb, guehdr, hdrlen); data = &guehdr[1]; if (guehdr->flags & GUE_FLAG_PRIV) { |
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__be32 flags = *(__be32 *)(data + doffset); |
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doffset += GUE_LEN_PRIV; if (flags & GUE_PFLAG_REMCSUM) { guehdr = gue_gro_remcsum(skb, off, guehdr, data + doffset, hdrlen, guehdr->proto_ctype); if (!guehdr) goto out; data = &guehdr[1]; doffset += GUE_PLEN_REMCSUM; } |
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} |
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skb_gro_pull(skb, hdrlen); |
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flush = 0; for (p = *head; p; p = p->next) { const struct guehdr *guehdr2; if (!NAPI_GRO_CB(p)->same_flow) continue; guehdr2 = (struct guehdr *)(p->data + off); /* Compare base GUE header to be equal (covers |
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* hlen, version, proto_ctype, and flags. |
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*/ if (guehdr->word != guehdr2->word) { NAPI_GRO_CB(p)->same_flow = 0; continue; } /* Compare optional fields are the same. */ if (guehdr->hlen && memcmp(&guehdr[1], &guehdr2[1], guehdr->hlen << 2)) { NAPI_GRO_CB(p)->same_flow = 0; continue; } } |
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rcu_read_lock(); offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; ops = rcu_dereference(offloads[guehdr->proto_ctype]); if (WARN_ON(!ops || !ops->callbacks.gro_receive)) goto out_unlock; |
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pp = ops->callbacks.gro_receive(head, skb); out_unlock: rcu_read_unlock(); out: NAPI_GRO_CB(skb)->flush |= flush; return pp; } static int gue_gro_complete(struct sk_buff *skb, int nhoff) { const struct net_offload **offloads; struct guehdr *guehdr = (struct guehdr *)(skb->data + nhoff); const struct net_offload *ops; unsigned int guehlen; u8 proto; int err = -ENOENT; |
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proto = guehdr->proto_ctype; |
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guehlen = sizeof(*guehdr) + (guehdr->hlen << 2); rcu_read_lock(); offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads; ops = rcu_dereference(offloads[proto]); if (WARN_ON(!ops || !ops->callbacks.gro_complete)) goto out_unlock; err = ops->callbacks.gro_complete(skb, nhoff + guehlen); out_unlock: rcu_read_unlock(); return err; } |
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static int fou_add_to_port_list(struct fou *fou) { struct fou *fout; spin_lock(&fou_lock); list_for_each_entry(fout, &fou_list, list) { if (fou->port == fout->port) { spin_unlock(&fou_lock); return -EALREADY; } } list_add(&fou->list, &fou_list); spin_unlock(&fou_lock); return 0; } static void fou_release(struct fou *fou) { struct socket *sock = fou->sock; struct sock *sk = sock->sk; udp_del_offload(&fou->udp_offloads); list_del(&fou->list); /* Remove hooks into tunnel socket */ sk->sk_user_data = NULL; sock_release(sock); kfree(fou); } |
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static int fou_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) { udp_sk(sk)->encap_rcv = fou_udp_recv; fou->protocol = cfg->protocol; fou->udp_offloads.callbacks.gro_receive = fou_gro_receive; fou->udp_offloads.callbacks.gro_complete = fou_gro_complete; fou->udp_offloads.port = cfg->udp_config.local_udp_port; fou->udp_offloads.ipproto = cfg->protocol; return 0; } static int gue_encap_init(struct sock *sk, struct fou *fou, struct fou_cfg *cfg) { udp_sk(sk)->encap_rcv = gue_udp_recv; fou->udp_offloads.callbacks.gro_receive = gue_gro_receive; fou->udp_offloads.callbacks.gro_complete = gue_gro_complete; fou->udp_offloads.port = cfg->udp_config.local_udp_port; return 0; } |
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static int fou_create(struct net *net, struct fou_cfg *cfg, struct socket **sockp) { struct fou *fou = NULL; int err; struct socket *sock = NULL; struct sock *sk; /* 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; |
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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; } |
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udp_sk(sk)->encap_type = 1; udp_encap_enable(); sk->sk_user_data = fou; fou->sock = sock; udp_set_convert_csum(sk, true); sk->sk_allocation = GFP_ATOMIC; |
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if (cfg->udp_config.family == AF_INET) { err = udp_add_offload(&fou->udp_offloads); if (err) goto error; } |
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err = fou_add_to_port_list(fou); if (err) goto error; if (sockp) *sockp = sock; return 0; error: kfree(fou); if (sock) sock_release(sock); return err; } static int fou_destroy(struct net *net, struct fou_cfg *cfg) { struct fou *fou; u16 port = cfg->udp_config.local_udp_port; int err = -EINVAL; spin_lock(&fou_lock); list_for_each_entry(fou, &fou_list, list) { if (fou->port == port) { |
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udp_del_offload(&fou->udp_offloads); |
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fou_release(fou); err = 0; break; } } spin_unlock(&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, }, |
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[FOU_ATTR_TYPE] = { .type = NLA_U8, }, |
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}; 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 && family != AF_INET6) return -EINVAL; cfg->udp_config.family = family; } if (info->attrs[FOU_ATTR_PORT]) { u16 port = nla_get_u16(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]); |
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if (info->attrs[FOU_ATTR_TYPE]) cfg->type = nla_get_u8(info->attrs[FOU_ATTR_TYPE]); |
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return 0; } static int fou_nl_cmd_add_port(struct sk_buff *skb, struct genl_info *info) { struct fou_cfg cfg; int err; err = parse_nl_config(info, &cfg); if (err) return err; return fou_create(&init_net, &cfg, NULL); } static int fou_nl_cmd_rm_port(struct sk_buff *skb, struct genl_info *info) { struct fou_cfg cfg; parse_nl_config(info, &cfg); return fou_destroy(&init_net, &cfg); } 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, }, }; |
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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); |
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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); uh->check = 0; 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) { bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; __be16 sport; skb = iptunnel_handle_offloads(skb, csum, 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) { bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM); int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL; struct guehdr *guehdr; |
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size_t hdrlen, optlen = 0; |
63487babf
|
655 |
__be16 sport; |
5024c33ac
|
656 657 |
void *data; bool need_priv = false; |
b17f709a2
|
658 659 660 661 662 663 664 |
if ((e->flags & TUNNEL_ENCAP_FLAG_REMCSUM) && skb->ip_summed == CHECKSUM_PARTIAL) { csum = false; optlen += GUE_PLEN_REMCSUM; type |= SKB_GSO_TUNNEL_REMCSUM; need_priv = true; } |
5024c33ac
|
665 |
optlen += need_priv ? GUE_LEN_PRIV : 0; |
63487babf
|
666 667 668 669 670 671 672 673 674 |
skb = iptunnel_handle_offloads(skb, csum, 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); |
b17f709a2
|
675 676 677 |
hdrlen = sizeof(struct guehdr) + optlen; skb_push(skb, hdrlen); |
63487babf
|
678 679 |
guehdr = (struct guehdr *)skb->data; |
5024c33ac
|
680 |
guehdr->control = 0; |
63487babf
|
681 |
guehdr->version = 0; |
5024c33ac
|
682 |
guehdr->hlen = optlen >> 2; |
63487babf
|
683 |
guehdr->flags = 0; |
5024c33ac
|
684 685 686 687 688 689 690 691 692 693 |
guehdr->proto_ctype = *protocol; data = &guehdr[1]; if (need_priv) { __be32 *flags = data; guehdr->flags |= GUE_FLAG_PRIV; *flags = 0; data += GUE_LEN_PRIV; |
b17f709a2
|
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 |
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; } |
5024c33ac
|
713 |
} |
63487babf
|
714 715 716 717 718 719 |
fou_build_udp(skb, e, fl4, protocol, sport); return 0; } EXPORT_SYMBOL(gue_build_header); |
a8c5f90fb
|
720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 |
#ifdef CONFIG_NET_FOU_IP_TUNNELS static const struct ip_tunnel_encap_ops __read_mostly fou_iptun_ops = { .encap_hlen = fou_encap_hlen, .build_header = fou_build_header, }; static const struct ip_tunnel_encap_ops __read_mostly 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 "); return ret; } ret = ip_tunnel_encap_add_ops(&gue_iptun_ops, TUNNEL_ENCAP_GUE); if (ret < 0) { pr_err("can't add gue ops "); 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; } |
882288c05
|
766 |
static void ip_tunnel_encap_del_fou_ops(void) |
a8c5f90fb
|
767 768 769 770 |
{ } #endif |
23461551c
|
771 772 773 774 775 776 |
static int __init fou_init(void) { int ret; ret = genl_register_family_with_ops(&fou_nl_family, fou_nl_ops); |
a8c5f90fb
|
777 778 779 780 781 782 783 784 |
if (ret < 0) goto exit; ret = ip_tunnel_encap_add_fou_ops(); if (ret < 0) genl_unregister_family(&fou_nl_family); exit: |
23461551c
|
785 786 787 788 789 790 |
return ret; } static void __exit fou_fini(void) { struct fou *fou, *next; |
a8c5f90fb
|
791 |
ip_tunnel_encap_del_fou_ops(); |
23461551c
|
792 793 794 795 796 797 798 799 800 801 802 803 804 805 |
genl_unregister_family(&fou_nl_family); /* Close all the FOU sockets */ spin_lock(&fou_lock); list_for_each_entry_safe(fou, next, &fou_list, list) fou_release(fou); spin_unlock(&fou_lock); } module_init(fou_init); module_exit(fou_fini); MODULE_AUTHOR("Tom Herbert <therbert@google.com>"); MODULE_LICENSE("GPL"); |