diff options
Diffstat (limited to 'net/key/af_key.c')
| -rw-r--r-- | net/key/af_key.c | 2903 |
1 files changed, 2903 insertions, 0 deletions
diff --git a/net/key/af_key.c b/net/key/af_key.c new file mode 100644 index 00000000000..ce980aa94ed --- /dev/null +++ b/net/key/af_key.c @@ -0,0 +1,2903 @@ +/* + * net/key/af_key.c An implementation of PF_KEYv2 sockets. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * Authors: Maxim Giryaev <gem@asplinux.ru> + * David S. Miller <davem@redhat.com> + * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> + * Kunihiro Ishiguro <kunihiro@ipinfusion.com> + * Kazunori MIYAZAWA / USAGI Project <miyazawa@linux-ipv6.org> + * Derek Atkins <derek@ihtfp.com> + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/socket.h> +#include <linux/pfkeyv2.h> +#include <linux/ipsec.h> +#include <linux/skbuff.h> +#include <linux/rtnetlink.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/proc_fs.h> +#include <linux/init.h> +#include <net/xfrm.h> + +#include <net/sock.h> + +#define _X2KEY(x) ((x) == XFRM_INF ? 0 : (x)) +#define _KEY2X(x) ((x) == 0 ? XFRM_INF : (x)) + + +/* List of all pfkey sockets. */ +static HLIST_HEAD(pfkey_table); +static DECLARE_WAIT_QUEUE_HEAD(pfkey_table_wait); +static DEFINE_RWLOCK(pfkey_table_lock); +static atomic_t pfkey_table_users = ATOMIC_INIT(0); + +static atomic_t pfkey_socks_nr = ATOMIC_INIT(0); + +struct pfkey_sock { + /* struct sock must be the first member of struct pfkey_sock */ + struct sock sk; + int registered; + int promisc; +}; + +static inline struct pfkey_sock *pfkey_sk(struct sock *sk) +{ + return (struct pfkey_sock *)sk; +} + +static void pfkey_sock_destruct(struct sock *sk) +{ + skb_queue_purge(&sk->sk_receive_queue); + + if (!sock_flag(sk, SOCK_DEAD)) { + printk("Attempt to release alive pfkey socket: %p\n", sk); + return; + } + + BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc)); + BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc)); + + atomic_dec(&pfkey_socks_nr); +} + +static void pfkey_table_grab(void) +{ + write_lock_bh(&pfkey_table_lock); + + if (atomic_read(&pfkey_table_users)) { + DECLARE_WAITQUEUE(wait, current); + + add_wait_queue_exclusive(&pfkey_table_wait, &wait); + for(;;) { + set_current_state(TASK_UNINTERRUPTIBLE); + if (atomic_read(&pfkey_table_users) == 0) + break; + write_unlock_bh(&pfkey_table_lock); + schedule(); + write_lock_bh(&pfkey_table_lock); + } + + __set_current_state(TASK_RUNNING); + remove_wait_queue(&pfkey_table_wait, &wait); + } +} + +static __inline__ void pfkey_table_ungrab(void) +{ + write_unlock_bh(&pfkey_table_lock); + wake_up(&pfkey_table_wait); +} + +static __inline__ void pfkey_lock_table(void) +{ + /* read_lock() synchronizes us to pfkey_table_grab */ + + read_lock(&pfkey_table_lock); + atomic_inc(&pfkey_table_users); + read_unlock(&pfkey_table_lock); +} + +static __inline__ void pfkey_unlock_table(void) +{ + if (atomic_dec_and_test(&pfkey_table_users)) + wake_up(&pfkey_table_wait); +} + + +static struct proto_ops pfkey_ops; + +static void pfkey_insert(struct sock *sk) +{ + pfkey_table_grab(); + sk_add_node(sk, &pfkey_table); + pfkey_table_ungrab(); +} + +static void pfkey_remove(struct sock *sk) +{ + pfkey_table_grab(); + sk_del_node_init(sk); + pfkey_table_ungrab(); +} + +static struct proto key_proto = { + .name = "KEY", + .owner = THIS_MODULE, + .obj_size = sizeof(struct pfkey_sock), +}; + +static int pfkey_create(struct socket *sock, int protocol) +{ + struct sock *sk; + int err; + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + if (sock->type != SOCK_RAW) + return -ESOCKTNOSUPPORT; + if (protocol != PF_KEY_V2) + return -EPROTONOSUPPORT; + + err = -ENOMEM; + sk = sk_alloc(PF_KEY, GFP_KERNEL, &key_proto, 1); + if (sk == NULL) + goto out; + + sock->ops = &pfkey_ops; + sock_init_data(sock, sk); + + sk->sk_family = PF_KEY; + sk->sk_destruct = pfkey_sock_destruct; + + atomic_inc(&pfkey_socks_nr); + + pfkey_insert(sk); + + return 0; +out: + return err; +} + +static int pfkey_release(struct socket *sock) +{ + struct sock *sk = sock->sk; + + if (!sk) + return 0; + + pfkey_remove(sk); + + sock_orphan(sk); + sock->sk = NULL; + skb_queue_purge(&sk->sk_write_queue); + sock_put(sk); + + return 0; +} + +static int pfkey_broadcast_one(struct sk_buff *skb, struct sk_buff **skb2, + int allocation, struct sock *sk) +{ + int err = -ENOBUFS; + + sock_hold(sk); + if (*skb2 == NULL) { + if (atomic_read(&skb->users) != 1) { + *skb2 = skb_clone(skb, allocation); + } else { + *skb2 = skb; + atomic_inc(&skb->users); + } + } + if (*skb2 != NULL) { + if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf) { + skb_orphan(*skb2); + skb_set_owner_r(*skb2, sk); + skb_queue_tail(&sk->sk_receive_queue, *skb2); + sk->sk_data_ready(sk, (*skb2)->len); + *skb2 = NULL; + err = 0; + } + } + sock_put(sk); + return err; +} + +/* Send SKB to all pfkey sockets matching selected criteria. */ +#define BROADCAST_ALL 0 +#define BROADCAST_ONE 1 +#define BROADCAST_REGISTERED 2 +#define BROADCAST_PROMISC_ONLY 4 +static int pfkey_broadcast(struct sk_buff *skb, int allocation, + int broadcast_flags, struct sock *one_sk) +{ + struct sock *sk; + struct hlist_node *node; + struct sk_buff *skb2 = NULL; + int err = -ESRCH; + + /* XXX Do we need something like netlink_overrun? I think + * XXX PF_KEY socket apps will not mind current behavior. + */ + if (!skb) + return -ENOMEM; + + pfkey_lock_table(); + sk_for_each(sk, node, &pfkey_table) { + struct pfkey_sock *pfk = pfkey_sk(sk); + int err2; + + /* Yes, it means that if you are meant to receive this + * pfkey message you receive it twice as promiscuous + * socket. + */ + if (pfk->promisc) + pfkey_broadcast_one(skb, &skb2, allocation, sk); + + /* the exact target will be processed later */ + if (sk == one_sk) + continue; + if (broadcast_flags != BROADCAST_ALL) { + if (broadcast_flags & BROADCAST_PROMISC_ONLY) + continue; + if ((broadcast_flags & BROADCAST_REGISTERED) && + !pfk->registered) + continue; + if (broadcast_flags & BROADCAST_ONE) + continue; + } + + err2 = pfkey_broadcast_one(skb, &skb2, allocation, sk); + + /* Error is cleare after succecful sending to at least one + * registered KM */ + if ((broadcast_flags & BROADCAST_REGISTERED) && err) + err = err2; + } + pfkey_unlock_table(); + + if (one_sk != NULL) + err = pfkey_broadcast_one(skb, &skb2, allocation, one_sk); + + if (skb2) + kfree_skb(skb2); + kfree_skb(skb); + return err; +} + +static inline void pfkey_hdr_dup(struct sadb_msg *new, struct sadb_msg *orig) +{ + *new = *orig; +} + +static int pfkey_error(struct sadb_msg *orig, int err, struct sock *sk) +{ + struct sk_buff *skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); + struct sadb_msg *hdr; + + if (!skb) + return -ENOBUFS; + + /* Woe be to the platform trying to support PFKEY yet + * having normal errnos outside the 1-255 range, inclusive. + */ + err = -err; + if (err == ERESTARTSYS || + err == ERESTARTNOHAND || + err == ERESTARTNOINTR) + err = EINTR; + if (err >= 512) + err = EINVAL; + if (err <= 0 || err >= 256) + BUG(); + + hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); + pfkey_hdr_dup(hdr, orig); + hdr->sadb_msg_errno = (uint8_t) err; + hdr->sadb_msg_len = (sizeof(struct sadb_msg) / + sizeof(uint64_t)); + + pfkey_broadcast(skb, GFP_KERNEL, BROADCAST_ONE, sk); + + return 0; +} + +static u8 sadb_ext_min_len[] = { + [SADB_EXT_RESERVED] = (u8) 0, + [SADB_EXT_SA] = (u8) sizeof(struct sadb_sa), + [SADB_EXT_LIFETIME_CURRENT] = (u8) sizeof(struct sadb_lifetime), + [SADB_EXT_LIFETIME_HARD] = (u8) sizeof(struct sadb_lifetime), + [SADB_EXT_LIFETIME_SOFT] = (u8) sizeof(struct sadb_lifetime), + [SADB_EXT_ADDRESS_SRC] = (u8) sizeof(struct sadb_address), + [SADB_EXT_ADDRESS_DST] = (u8) sizeof(struct sadb_address), + [SADB_EXT_ADDRESS_PROXY] = (u8) sizeof(struct sadb_address), + [SADB_EXT_KEY_AUTH] = (u8) sizeof(struct sadb_key), + [SADB_EXT_KEY_ENCRYPT] = (u8) sizeof(struct sadb_key), + [SADB_EXT_IDENTITY_SRC] = (u8) sizeof(struct sadb_ident), + [SADB_EXT_IDENTITY_DST] = (u8) sizeof(struct sadb_ident), + [SADB_EXT_SENSITIVITY] = (u8) sizeof(struct sadb_sens), + [SADB_EXT_PROPOSAL] = (u8) sizeof(struct sadb_prop), + [SADB_EXT_SUPPORTED_AUTH] = (u8) sizeof(struct sadb_supported), + [SADB_EXT_SUPPORTED_ENCRYPT] = (u8) sizeof(struct sadb_supported), + [SADB_EXT_SPIRANGE] = (u8) sizeof(struct sadb_spirange), + [SADB_X_EXT_KMPRIVATE] = (u8) sizeof(struct sadb_x_kmprivate), + [SADB_X_EXT_POLICY] = (u8) sizeof(struct sadb_x_policy), + [SADB_X_EXT_SA2] = (u8) sizeof(struct sadb_x_sa2), + [SADB_X_EXT_NAT_T_TYPE] = (u8) sizeof(struct sadb_x_nat_t_type), + [SADB_X_EXT_NAT_T_SPORT] = (u8) sizeof(struct sadb_x_nat_t_port), + [SADB_X_EXT_NAT_T_DPORT] = (u8) sizeof(struct sadb_x_nat_t_port), + [SADB_X_EXT_NAT_T_OA] = (u8) sizeof(struct sadb_address), +}; + +/* Verify sadb_address_{len,prefixlen} against sa_family. */ +static int verify_address_len(void *p) +{ + struct sadb_address *sp = p; + struct sockaddr *addr = (struct sockaddr *)(sp + 1); + struct sockaddr_in *sin; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + struct sockaddr_in6 *sin6; +#endif + int len; + + switch (addr->sa_family) { + case AF_INET: + len = sizeof(*sp) + sizeof(*sin) + (sizeof(uint64_t) - 1); + len /= sizeof(uint64_t); + if (sp->sadb_address_len != len || + sp->sadb_address_prefixlen > 32) + return -EINVAL; + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + len = sizeof(*sp) + sizeof(*sin6) + (sizeof(uint64_t) - 1); + len /= sizeof(uint64_t); + if (sp->sadb_address_len != len || + sp->sadb_address_prefixlen > 128) + return -EINVAL; + break; +#endif + default: + /* It is user using kernel to keep track of security + * associations for another protocol, such as + * OSPF/RSVP/RIPV2/MIP. It is user's job to verify + * lengths. + * + * XXX Actually, association/policy database is not yet + * XXX able to cope with arbitrary sockaddr families. + * XXX When it can, remove this -EINVAL. -DaveM + */ + return -EINVAL; + break; + }; + + return 0; +} + +static int present_and_same_family(struct sadb_address *src, + struct sadb_address *dst) +{ + struct sockaddr *s_addr, *d_addr; + + if (!src || !dst) + return 0; + + s_addr = (struct sockaddr *)(src + 1); + d_addr = (struct sockaddr *)(dst + 1); + if (s_addr->sa_family != d_addr->sa_family) + return 0; + if (s_addr->sa_family != AF_INET +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + && s_addr->sa_family != AF_INET6 +#endif + ) + return 0; + + return 1; +} + +static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + char *p = (char *) hdr; + int len = skb->len; + + len -= sizeof(*hdr); + p += sizeof(*hdr); + while (len > 0) { + struct sadb_ext *ehdr = (struct sadb_ext *) p; + uint16_t ext_type; + int ext_len; + + ext_len = ehdr->sadb_ext_len; + ext_len *= sizeof(uint64_t); + ext_type = ehdr->sadb_ext_type; + if (ext_len < sizeof(uint64_t) || + ext_len > len || + ext_type == SADB_EXT_RESERVED) + return -EINVAL; + + if (ext_type <= SADB_EXT_MAX) { + int min = (int) sadb_ext_min_len[ext_type]; + if (ext_len < min) + return -EINVAL; + if (ext_hdrs[ext_type-1] != NULL) + return -EINVAL; + if (ext_type == SADB_EXT_ADDRESS_SRC || + ext_type == SADB_EXT_ADDRESS_DST || + ext_type == SADB_EXT_ADDRESS_PROXY || + ext_type == SADB_X_EXT_NAT_T_OA) { + if (verify_address_len(p)) + return -EINVAL; + } + ext_hdrs[ext_type-1] = p; + } + p += ext_len; + len -= ext_len; + } + + return 0; +} + +static uint16_t +pfkey_satype2proto(uint8_t satype) +{ + switch (satype) { + case SADB_SATYPE_UNSPEC: + return IPSEC_PROTO_ANY; + case SADB_SATYPE_AH: + return IPPROTO_AH; + case SADB_SATYPE_ESP: + return IPPROTO_ESP; + case SADB_X_SATYPE_IPCOMP: + return IPPROTO_COMP; + break; + default: + return 0; + } + /* NOTREACHED */ +} + +static uint8_t +pfkey_proto2satype(uint16_t proto) +{ + switch (proto) { + case IPPROTO_AH: + return SADB_SATYPE_AH; + case IPPROTO_ESP: + return SADB_SATYPE_ESP; + case IPPROTO_COMP: + return SADB_X_SATYPE_IPCOMP; + break; + default: + return 0; + } + /* NOTREACHED */ +} + +/* BTW, this scheme means that there is no way with PFKEY2 sockets to + * say specifically 'just raw sockets' as we encode them as 255. + */ + +static uint8_t pfkey_proto_to_xfrm(uint8_t proto) +{ + return (proto == IPSEC_PROTO_ANY ? 0 : proto); +} + +static uint8_t pfkey_proto_from_xfrm(uint8_t proto) +{ + return (proto ? proto : IPSEC_PROTO_ANY); +} + +static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, + xfrm_address_t *xaddr) +{ + switch (((struct sockaddr*)(addr + 1))->sa_family) { + case AF_INET: + xaddr->a4 = + ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr; + return AF_INET; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + memcpy(xaddr->a6, + &((struct sockaddr_in6 *)(addr + 1))->sin6_addr, + sizeof(struct in6_addr)); + return AF_INET6; +#endif + default: + return 0; + } + /* NOTREACHED */ +} + +static struct xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs) +{ + struct sadb_sa *sa; + struct sadb_address *addr; + uint16_t proto; + unsigned short family; + xfrm_address_t *xaddr; + + sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; + if (sa == NULL) + return NULL; + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return NULL; + + /* sadb_address_len should be checked by caller */ + addr = (struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1]; + if (addr == NULL) + return NULL; + + family = ((struct sockaddr *)(addr + 1))->sa_family; + switch (family) { + case AF_INET: + xaddr = (xfrm_address_t *)&((struct sockaddr_in *)(addr + 1))->sin_addr; + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + xaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(addr + 1))->sin6_addr; + break; +#endif + default: + xaddr = NULL; + } + + if (!xaddr) + return NULL; + + return xfrm_state_lookup(xaddr, sa->sadb_sa_spi, proto, family); +} + +#define PFKEY_ALIGN8(a) (1 + (((a) - 1) | (8 - 1))) +static int +pfkey_sockaddr_size(sa_family_t family) +{ + switch (family) { + case AF_INET: + return PFKEY_ALIGN8(sizeof(struct sockaddr_in)); +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + return PFKEY_ALIGN8(sizeof(struct sockaddr_in6)); +#endif + default: + return 0; + } + /* NOTREACHED */ +} + +static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sadb_sa *sa; + struct sadb_lifetime *lifetime; + struct sadb_address *addr; + struct sadb_key *key; + struct sadb_x_sa2 *sa2; + struct sockaddr_in *sin; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + struct sockaddr_in6 *sin6; +#endif + int size; + int auth_key_size = 0; + int encrypt_key_size = 0; + int sockaddr_size; + struct xfrm_encap_tmpl *natt = NULL; + + /* address family check */ + sockaddr_size = pfkey_sockaddr_size(x->props.family); + if (!sockaddr_size) + return ERR_PTR(-EINVAL); + + /* base, SA, (lifetime (HSC),) address(SD), (address(P),) + key(AE), (identity(SD),) (sensitivity)> */ + size = sizeof(struct sadb_msg) +sizeof(struct sadb_sa) + + sizeof(struct sadb_lifetime) + + ((hsc & 1) ? sizeof(struct sadb_lifetime) : 0) + + ((hsc & 2) ? sizeof(struct sadb_lifetime) : 0) + + sizeof(struct sadb_address)*2 + + sockaddr_size*2 + + sizeof(struct sadb_x_sa2); + /* identity & sensitivity */ + + if ((x->props.family == AF_INET && + x->sel.saddr.a4 != x->props.saddr.a4) +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + || (x->props.family == AF_INET6 && + memcmp (x->sel.saddr.a6, x->props.saddr.a6, sizeof (struct in6_addr))) +#endif + ) + size += sizeof(struct sadb_address) + sockaddr_size; + + if (add_keys) { + if (x->aalg && x->aalg->alg_key_len) { + auth_key_size = + PFKEY_ALIGN8((x->aalg->alg_key_len + 7) / 8); + size += sizeof(struct sadb_key) + auth_key_size; + } + if (x->ealg && x->ealg->alg_key_len) { + encrypt_key_size = + PFKEY_ALIGN8((x->ealg->alg_key_len+7) / 8); + size += sizeof(struct sadb_key) + encrypt_key_size; + } + } + if (x->encap) + natt = x->encap; + + if (natt && natt->encap_type) { + size += sizeof(struct sadb_x_nat_t_type); + size += sizeof(struct sadb_x_nat_t_port); + size += sizeof(struct sadb_x_nat_t_port); + } + + skb = alloc_skb(size + 16, GFP_ATOMIC); + if (skb == NULL) + return ERR_PTR(-ENOBUFS); + + /* call should fill header later */ + hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); + memset(hdr, 0, size); /* XXX do we need this ? */ + hdr->sadb_msg_len = size / sizeof(uint64_t); + + /* sa */ + sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); + sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_spi = x->id.spi; + sa->sadb_sa_replay = x->props.replay_window; + sa->sadb_sa_state = SADB_SASTATE_DYING; + if (x->km.state == XFRM_STATE_VALID && !x->km.dying) + sa->sadb_sa_state = SADB_SASTATE_MATURE; + else if (x->km.state == XFRM_STATE_ACQ) + sa->sadb_sa_state = SADB_SASTATE_LARVAL; + else if (x->km.state == XFRM_STATE_EXPIRED) + sa->sadb_sa_state = SADB_SASTATE_DEAD; + sa->sadb_sa_auth = 0; + if (x->aalg) { + struct xfrm_algo_desc *a = xfrm_aalg_get_byname(x->aalg->alg_name, 0); + sa->sadb_sa_auth = a ? a->desc.sadb_alg_id : 0; + } + sa->sadb_sa_encrypt = 0; + BUG_ON(x->ealg && x->calg); + if (x->ealg) { + struct xfrm_algo_desc *a = xfrm_ealg_get_byname(x->ealg->alg_name, 0); + sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; + } + /* KAME compatible: sadb_sa_encrypt is overloaded with calg id */ + if (x->calg) { + struct xfrm_algo_desc *a = xfrm_calg_get_byname(x->calg->alg_name, 0); + sa->sadb_sa_encrypt = a ? a->desc.sadb_alg_id : 0; + } + + sa->sadb_sa_flags = 0; + if (x->props.flags & XFRM_STATE_NOECN) + sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN; + if (x->props.flags & XFRM_STATE_DECAP_DSCP) + sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP; + + /* hard time */ + if (hsc & 2) { + lifetime = (struct sadb_lifetime *) skb_put(skb, + sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; + lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.hard_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.hard_byte_limit); + lifetime->sadb_lifetime_addtime = x->lft.hard_add_expires_seconds; + lifetime->sadb_lifetime_usetime = x->lft.hard_use_expires_seconds; + } + /* soft time */ + if (hsc & 1) { + lifetime = (struct sadb_lifetime *) skb_put(skb, + sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; + lifetime->sadb_lifetime_allocations = _X2KEY(x->lft.soft_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(x->lft.soft_byte_limit); + lifetime->sadb_lifetime_addtime = x->lft.soft_add_expires_seconds; + lifetime->sadb_lifetime_usetime = x->lft.soft_use_expires_seconds; + } + /* current time */ + lifetime = (struct sadb_lifetime *) skb_put(skb, + sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; + lifetime->sadb_lifetime_allocations = x->curlft.packets; + lifetime->sadb_lifetime_bytes = x->curlft.bytes; + lifetime->sadb_lifetime_addtime = x->curlft.add_time; + lifetime->sadb_lifetime_usetime = x->curlft.use_time; + /* src address */ + addr = (struct sadb_address*) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + /* "if the ports are non-zero, then the sadb_address_proto field, + normally zero, MUST be filled in with the transport + protocol's number." - RFC2367 */ + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + if (x->props.family == AF_INET) { + addr->sadb_address_prefixlen = 32; + + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = x->props.saddr.a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (x->props.family == AF_INET6) { + addr->sadb_address_prefixlen = 128; + + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, x->props.saddr.a6, + sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } +#endif + else + BUG(); + + /* dst address */ + addr = (struct sadb_address*) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = 0; + addr->sadb_address_prefixlen = 32; /* XXX */ + addr->sadb_address_reserved = 0; + if (x->props.family == AF_INET) { + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = x->id.daddr.a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + + if (x->sel.saddr.a4 != x->props.saddr.a4) { + addr = (struct sadb_address*) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; + addr->sadb_address_proto = + pfkey_proto_from_xfrm(x->sel.proto); + addr->sadb_address_prefixlen = x->sel.prefixlen_s; + addr->sadb_address_reserved = 0; + + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = x->sel.saddr.a4; + sin->sin_port = x->sel.sport; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (x->props.family == AF_INET6) { + addr->sadb_address_prefixlen = 128; + + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, x->id.daddr.a6, sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + + if (memcmp (x->sel.saddr.a6, x->props.saddr.a6, + sizeof(struct in6_addr))) { + addr = (struct sadb_address *) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_PROXY; + addr->sadb_address_proto = + pfkey_proto_from_xfrm(x->sel.proto); + addr->sadb_address_prefixlen = x->sel.prefixlen_s; + addr->sadb_address_reserved = 0; + + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = x->sel.sport; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, x->sel.saddr.a6, + sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } + } +#endif + else + BUG(); + + /* auth key */ + if (add_keys && auth_key_size) { + key = (struct sadb_key *) skb_put(skb, + sizeof(struct sadb_key)+auth_key_size); + key->sadb_key_len = (sizeof(struct sadb_key) + auth_key_size) / + sizeof(uint64_t); + key->sadb_key_exttype = SADB_EXT_KEY_AUTH; + key->sadb_key_bits = x->aalg->alg_key_len; + key->sadb_key_reserved = 0; + memcpy(key + 1, x->aalg->alg_key, (x->aalg->alg_key_len+7)/8); + } + /* encrypt key */ + if (add_keys && encrypt_key_size) { + key = (struct sadb_key *) skb_put(skb, + sizeof(struct sadb_key)+encrypt_key_size); + key->sadb_key_len = (sizeof(struct sadb_key) + + encrypt_key_size) / sizeof(uint64_t); + key->sadb_key_exttype = SADB_EXT_KEY_ENCRYPT; + key->sadb_key_bits = x->ealg->alg_key_len; + key->sadb_key_reserved = 0; + memcpy(key + 1, x->ealg->alg_key, + (x->ealg->alg_key_len+7)/8); + } + + /* sa */ + sa2 = (struct sadb_x_sa2 *) skb_put(skb, sizeof(struct sadb_x_sa2)); + sa2->sadb_x_sa2_len = sizeof(struct sadb_x_sa2)/sizeof(uint64_t); + sa2->sadb_x_sa2_exttype = SADB_X_EXT_SA2; + sa2->sadb_x_sa2_mode = x->props.mode + 1; + sa2->sadb_x_sa2_reserved1 = 0; + sa2->sadb_x_sa2_reserved2 = 0; + sa2->sadb_x_sa2_sequence = 0; + sa2->sadb_x_sa2_reqid = x->props.reqid; + + if (natt && natt->encap_type) { + struct sadb_x_nat_t_type *n_type; + struct sadb_x_nat_t_port *n_port; + + /* type */ + n_type = (struct sadb_x_nat_t_type*) skb_put(skb, sizeof(*n_type)); + n_type->sadb_x_nat_t_type_len = sizeof(*n_type)/sizeof(uint64_t); + n_type->sadb_x_nat_t_type_exttype = SADB_X_EXT_NAT_T_TYPE; + n_type->sadb_x_nat_t_type_type = natt->encap_type; + n_type->sadb_x_nat_t_type_reserved[0] = 0; + n_type->sadb_x_nat_t_type_reserved[1] = 0; + n_type->sadb_x_nat_t_type_reserved[2] = 0; + + /* source port */ + n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; + n_port->sadb_x_nat_t_port_port = natt->encap_sport; + n_port->sadb_x_nat_t_port_reserved = 0; + + /* dest port */ + n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; + n_port->sadb_x_nat_t_port_port = natt->encap_dport; + n_port->sadb_x_nat_t_port_reserved = 0; + } + + return skb; +} + +static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr, + void **ext_hdrs) +{ + struct xfrm_state *x; + struct sadb_lifetime *lifetime; + struct sadb_sa *sa; + struct sadb_key *key; + uint16_t proto; + int err; + + + sa = (struct sadb_sa *) ext_hdrs[SADB_EXT_SA-1]; + if (!sa || + !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return ERR_PTR(-EINVAL); + if (hdr->sadb_msg_satype == SADB_SATYPE_ESP && + !ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]) + return ERR_PTR(-EINVAL); + if (hdr->sadb_msg_satype == SADB_SATYPE_AH && + !ext_hdrs[SADB_EXT_KEY_AUTH-1]) + return ERR_PTR(-EINVAL); + if (!!ext_hdrs[SADB_EXT_LIFETIME_HARD-1] != + !!ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) + return ERR_PTR(-EINVAL); + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return ERR_PTR(-EINVAL); + + /* default error is no buffer space */ + err = -ENOBUFS; + + /* RFC2367: + + Only SADB_SASTATE_MATURE SAs may be submitted in an SADB_ADD message. + SADB_SASTATE_LARVAL SAs are created by SADB_GETSPI and it is not + sensible to add a new SA in the DYING or SADB_SASTATE_DEAD state. + Therefore, the sadb_sa_state field of all submitted SAs MUST be + SADB_SASTATE_MATURE and the kernel MUST return an error if this is + not true. + + However, KAME setkey always uses SADB_SASTATE_LARVAL. + Hence, we have to _ignore_ sadb_sa_state, which is also reasonable. + */ + if (sa->sadb_sa_auth > SADB_AALG_MAX || + (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP && + sa->sadb_sa_encrypt > SADB_X_CALG_MAX) || + sa->sadb_sa_encrypt > SADB_EALG_MAX) + return ERR_PTR(-EINVAL); + key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; + if (key != NULL && + sa->sadb_sa_auth != SADB_X_AALG_NULL && + ((key->sadb_key_bits+7) / 8 == 0 || + (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) + return ERR_PTR(-EINVAL); + key = ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; + if (key != NULL && + sa->sadb_sa_encrypt != SADB_EALG_NULL && + ((key->sadb_key_bits+7) / 8 == 0 || + (key->sadb_key_bits+7) / 8 > key->sadb_key_len * sizeof(uint64_t))) + return ERR_PTR(-EINVAL); + + x = xfrm_state_alloc(); + if (x == NULL) + return ERR_PTR(-ENOBUFS); + + x->id.proto = proto; + x->id.spi = sa->sadb_sa_spi; + x->props.replay_window = sa->sadb_sa_replay; + if (sa->sadb_sa_flags & SADB_SAFLAGS_NOECN) + x->props.flags |= XFRM_STATE_NOECN; + if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP) + x->props.flags |= XFRM_STATE_DECAP_DSCP; + + lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1]; + if (lifetime != NULL) { + x->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + x->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + x->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; + x->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]; + if (lifetime != NULL) { + x->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + x->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; + x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1]; + if (sa->sadb_sa_auth) { + int keysize = 0; + struct xfrm_algo_desc *a = xfrm_aalg_get_byid(sa->sadb_sa_auth); + if (!a) { + err = -ENOSYS; + goto out; + } + if (key) + keysize = (key->sadb_key_bits + 7) / 8; + x->aalg = kmalloc(sizeof(*x->aalg) + keysize, GFP_KERNEL); + if (!x->aalg) + goto out; + strcpy(x->aalg->alg_name, a->name); + x->aalg->alg_key_len = 0; + if (key) { + x->aalg->alg_key_len = key->sadb_key_bits; + memcpy(x->aalg->alg_key, key+1, keysize); + } + x->props.aalgo = sa->sadb_sa_auth; + /* x->algo.flags = sa->sadb_sa_flags; */ + } + if (sa->sadb_sa_encrypt) { + if (hdr->sadb_msg_satype == SADB_X_SATYPE_IPCOMP) { + struct xfrm_algo_desc *a = xfrm_calg_get_byid(sa->sadb_sa_encrypt); + if (!a) { + err = -ENOSYS; + goto out; + } + x->calg = kmalloc(sizeof(*x->calg), GFP_KERNEL); + if (!x->calg) + goto out; + strcpy(x->calg->alg_name, a->name); + x->props.calgo = sa->sadb_sa_encrypt; + } else { + int keysize = 0; + struct xfrm_algo_desc *a = xfrm_ealg_get_byid(sa->sadb_sa_encrypt); + if (!a) { + err = -ENOSYS; + goto out; + } + key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_ENCRYPT-1]; + if (key) + keysize = (key->sadb_key_bits + 7) / 8; + x->ealg = kmalloc(sizeof(*x->ealg) + keysize, GFP_KERNEL); + if (!x->ealg) + goto out; + strcpy(x->ealg->alg_name, a->name); + x->ealg->alg_key_len = 0; + if (key) { + x->ealg->alg_key_len = key->sadb_key_bits; + memcpy(x->ealg->alg_key, key+1, keysize); + } + x->props.ealgo = sa->sadb_sa_encrypt; + } + } + /* x->algo.flags = sa->sadb_sa_flags; */ + + x->props.family = pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + &x->props.saddr); + if (!x->props.family) { + err = -EAFNOSUPPORT; + goto out; + } + pfkey_sadb_addr2xfrm_addr((struct sadb_address *) ext_hdrs[SADB_EXT_ADDRESS_DST-1], + &x->id.daddr); + + if (ext_hdrs[SADB_X_EXT_SA2-1]) { + struct sadb_x_sa2 *sa2 = (void*)ext_hdrs[SADB_X_EXT_SA2-1]; + x->props.mode = sa2->sadb_x_sa2_mode; + if (x->props.mode) + x->props.mode--; + x->props.reqid = sa2->sadb_x_sa2_reqid; + } + + if (ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]) { + struct sadb_address *addr = ext_hdrs[SADB_EXT_ADDRESS_PROXY-1]; + + /* Nobody uses this, but we try. */ + x->sel.family = pfkey_sadb_addr2xfrm_addr(addr, &x->sel.saddr); + x->sel.prefixlen_s = addr->sadb_address_prefixlen; + } + + if (ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]) { + struct sadb_x_nat_t_type* n_type; + struct xfrm_encap_tmpl *natt; + + x->encap = kmalloc(sizeof(*x->encap), GFP_KERNEL); + if (!x->encap) + goto out; + + natt = x->encap; + n_type = ext_hdrs[SADB_X_EXT_NAT_T_TYPE-1]; + natt->encap_type = n_type->sadb_x_nat_t_type_type; + + if (ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]) { + struct sadb_x_nat_t_port* n_port = + ext_hdrs[SADB_X_EXT_NAT_T_SPORT-1]; + natt->encap_sport = n_port->sadb_x_nat_t_port_port; + } + if (ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]) { + struct sadb_x_nat_t_port* n_port = + ext_hdrs[SADB_X_EXT_NAT_T_DPORT-1]; + natt->encap_dport = n_port->sadb_x_nat_t_port_port; + } + } + + x->type = xfrm_get_type(proto, x->props.family); + if (x->type == NULL) { + err = -ENOPROTOOPT; + goto out; + } + if (x->type->init_state(x, NULL)) { + err = -EINVAL; + goto out; + } + x->km.seq = hdr->sadb_msg_seq; + x->km.state = XFRM_STATE_VALID; + return x; + +out: + x->km.state = XFRM_STATE_DEAD; + xfrm_state_put(x); + return ERR_PTR(err); +} + +static int pfkey_reserved(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + return -EOPNOTSUPP; +} + +static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct sk_buff *resp_skb; + struct sadb_x_sa2 *sa2; + struct sadb_address *saddr, *daddr; + struct sadb_msg *out_hdr; + struct xfrm_state *x = NULL; + u8 mode; + u32 reqid; + u8 proto; + unsigned short family; + xfrm_address_t *xsaddr = NULL, *xdaddr = NULL; + + if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return -EINVAL; + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return -EINVAL; + + if ((sa2 = ext_hdrs[SADB_X_EXT_SA2-1]) != NULL) { + mode = sa2->sadb_x_sa2_mode - 1; + reqid = sa2->sadb_x_sa2_reqid; + } else { + mode = 0; + reqid = 0; + } + + saddr = ext_hdrs[SADB_EXT_ADDRESS_SRC-1]; + daddr = ext_hdrs[SADB_EXT_ADDRESS_DST-1]; + + family = ((struct sockaddr *)(saddr + 1))->sa_family; + switch (family) { + case AF_INET: + xdaddr = (xfrm_address_t *)&((struct sockaddr_in *)(daddr + 1))->sin_addr.s_addr; + xsaddr = (xfrm_address_t *)&((struct sockaddr_in *)(saddr + 1))->sin_addr.s_addr; + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + xdaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(daddr + 1))->sin6_addr; + xsaddr = (xfrm_address_t *)&((struct sockaddr_in6 *)(saddr + 1))->sin6_addr; + break; +#endif + } + + if (hdr->sadb_msg_seq) { + x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); + if (x && xfrm_addr_cmp(&x->id.daddr, xdaddr, family)) { + xfrm_state_put(x); + x = NULL; + } + } + + if (!x) + x = xfrm_find_acq(mode, reqid, proto, xdaddr, xsaddr, 1, family); + + if (x == NULL) + return -ENOENT; + + resp_skb = ERR_PTR(-ENOENT); + + spin_lock_bh(&x->lock); + if (x->km.state != XFRM_STATE_DEAD) { + struct sadb_spirange *range = ext_hdrs[SADB_EXT_SPIRANGE-1]; + u32 min_spi, max_spi; + + if (range != NULL) { + min_spi = range->sadb_spirange_min; + max_spi = range->sadb_spirange_max; + } else { + min_spi = 0x100; + max_spi = 0x0fffffff; + } + xfrm_alloc_spi(x, htonl(min_spi), htonl(max_spi)); + if (x->id.spi) + resp_skb = pfkey_xfrm_state2msg(x, 0, 3); + } + spin_unlock_bh(&x->lock); + + if (IS_ERR(resp_skb)) { + xfrm_state_put(x); + return PTR_ERR(resp_skb); + } + + out_hdr = (struct sadb_msg *) resp_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = SADB_GETSPI; + out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + + xfrm_state_put(x); + + pfkey_broadcast(resp_skb, GFP_KERNEL, BROADCAST_ONE, sk); + + return 0; +} + +static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct xfrm_state *x; + + if (hdr->sadb_msg_len != sizeof(struct sadb_msg)/8) + return -EOPNOTSUPP; + + if (hdr->sadb_msg_seq == 0 || hdr->sadb_msg_errno == 0) + return 0; + + x = xfrm_find_acq_byseq(hdr->sadb_msg_seq); + if (x == NULL) + return 0; + + spin_lock_bh(&x->lock); + if (x->km.state == XFRM_STATE_ACQ) { + x->km.state = XFRM_STATE_ERROR; + wake_up(&km_waitq); + } + spin_unlock_bh(&x->lock); + xfrm_state_put(x); + return 0; +} + + +static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + struct xfrm_state *x; + int err; + + xfrm_probe_algs(); + + x = pfkey_msg2xfrm_state(hdr, ext_hdrs); + if (IS_ERR(x)) + return PTR_ERR(x); + + if (hdr->sadb_msg_type == SADB_ADD) + err = xfrm_state_add(x); + else + err = xfrm_state_update(x); + + if (err < 0) { + x->km.state = XFRM_STATE_DEAD; + xfrm_state_put(x); + return err; + } + + out_skb = pfkey_xfrm_state2msg(x, 0, 3); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); /* XXX Should we return 0 here ? */ + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = hdr->sadb_msg_type; + out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk); + + return 0; +} + +static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct xfrm_state *x; + + if (!ext_hdrs[SADB_EXT_SA-1] || + !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return -EINVAL; + + x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); + if (x == NULL) + return -ESRCH; + + if (xfrm_state_kern(x)) { + xfrm_state_put(x); + return -EPERM; + } + + xfrm_state_delete(x); + xfrm_state_put(x); + + pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, + BROADCAST_ALL, sk); + + return 0; +} + +static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + __u8 proto; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + struct xfrm_state *x; + + if (!ext_hdrs[SADB_EXT_SA-1] || + !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1])) + return -EINVAL; + + x = pfkey_xfrm_state_lookup(hdr, ext_hdrs); + if (x == NULL) + return -ESRCH; + + out_skb = pfkey_xfrm_state2msg(x, 1, 3); + proto = x->id.proto; + xfrm_state_put(x); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = SADB_DUMP; + out_hdr->sadb_msg_satype = pfkey_proto2satype(proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk); + + return 0; +} + +static struct sk_buff *compose_sadb_supported(struct sadb_msg *orig, int allocation) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + int len, auth_len, enc_len, i; + + auth_len = xfrm_count_auth_supported(); + if (auth_len) { + auth_len *= sizeof(struct sadb_alg); + auth_len += sizeof(struct sadb_supported); + } + + enc_len = xfrm_count_enc_supported(); + if (enc_len) { + enc_len *= sizeof(struct sadb_alg); + enc_len += sizeof(struct sadb_supported); + } + + len = enc_len + auth_len + sizeof(struct sadb_msg); + + skb = alloc_skb(len + 16, allocation); + if (!skb) + goto out_put_algs; + + hdr = (struct sadb_msg *) skb_put(skb, sizeof(*hdr)); + pfkey_hdr_dup(hdr, orig); + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_len = len / sizeof(uint64_t); + + if (auth_len) { + struct sadb_supported *sp; + struct sadb_alg *ap; + + sp = (struct sadb_supported *) skb_put(skb, auth_len); + ap = (struct sadb_alg *) (sp + 1); + + sp->sadb_supported_len = auth_len / sizeof(uint64_t); + sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_AUTH; + + for (i = 0; ; i++) { + struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); + if (!aalg) + break; + if (aalg->available) + *ap++ = aalg->desc; + } + } + + if (enc_len) { + struct sadb_supported *sp; + struct sadb_alg *ap; + + sp = (struct sadb_supported *) skb_put(skb, enc_len); + ap = (struct sadb_alg *) (sp + 1); + + sp->sadb_supported_len = enc_len / sizeof(uint64_t); + sp->sadb_supported_exttype = SADB_EXT_SUPPORTED_ENCRYPT; + + for (i = 0; ; i++) { + struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); + if (!ealg) + break; + if (ealg->available) + *ap++ = ealg->desc; + } + } + +out_put_algs: + return skb; +} + +static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct pfkey_sock *pfk = pfkey_sk(sk); + struct sk_buff *supp_skb; + + if (hdr->sadb_msg_satype > SADB_SATYPE_MAX) + return -EINVAL; + + if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) { + if (pfk->registered&(1<<hdr->sadb_msg_satype)) + return -EEXIST; + pfk->registered |= (1<<hdr->sadb_msg_satype); + } + + xfrm_probe_algs(); + + supp_skb = compose_sadb_supported(hdr, GFP_KERNEL); + if (!supp_skb) { + if (hdr->sadb_msg_satype != SADB_SATYPE_UNSPEC) + pfk->registered &= ~(1<<hdr->sadb_msg_satype); + + return -ENOBUFS; + } + + pfkey_broadcast(supp_skb, GFP_KERNEL, BROADCAST_REGISTERED, sk); + + return 0; +} + +static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + unsigned proto; + struct sk_buff *skb_out; + struct sadb_msg *hdr_out; + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return -EINVAL; + + skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); + if (!skb_out) + return -ENOBUFS; + + xfrm_state_flush(proto); + + hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); + pfkey_hdr_dup(hdr_out, hdr); + hdr_out->sadb_msg_errno = (uint8_t) 0; + hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); + + pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL); + + return 0; +} + +struct pfkey_dump_data +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sock *sk; +}; + +static int dump_sa(struct xfrm_state *x, int count, void *ptr) +{ + struct pfkey_dump_data *data = ptr; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + + out_skb = pfkey_xfrm_state2msg(x, 1, 3); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; + out_hdr->sadb_msg_type = SADB_DUMP; + out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = count; + out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); + return 0; +} + +static int pfkey_dump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + u8 proto; + struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; + + proto = pfkey_satype2proto(hdr->sadb_msg_satype); + if (proto == 0) + return -EINVAL; + + return xfrm_state_walk(proto, dump_sa, &data); +} + +static int pfkey_promisc(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct pfkey_sock *pfk = pfkey_sk(sk); + int satype = hdr->sadb_msg_satype; + + if (hdr->sadb_msg_len == (sizeof(*hdr) / sizeof(uint64_t))) { + /* XXX we mangle packet... */ + hdr->sadb_msg_errno = 0; + if (satype != 0 && satype != 1) + return -EINVAL; + pfk->promisc = satype; + } + pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, BROADCAST_ALL, NULL); + return 0; +} + +static int check_reqid(struct xfrm_policy *xp, int dir, int count, void *ptr) +{ + int i; + u32 reqid = *(u32*)ptr; + + for (i=0; i<xp->xfrm_nr; i++) { + if (xp->xfrm_vec[i].reqid == reqid) + return -EEXIST; + } + return 0; +} + +static u32 gen_reqid(void) +{ + u32 start; + static u32 reqid = IPSEC_MANUAL_REQID_MAX; + + start = reqid; + do { + ++reqid; + if (reqid == 0) + reqid = IPSEC_MANUAL_REQID_MAX+1; + if (xfrm_policy_walk(check_reqid, (void*)&reqid) != -EEXIST) + return reqid; + } while (reqid != start); + return 0; +} + +static int +parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq) +{ + struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr; + struct sockaddr_in *sin; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + struct sockaddr_in6 *sin6; +#endif + + if (xp->xfrm_nr >= XFRM_MAX_DEPTH) + return -ELOOP; + + if (rq->sadb_x_ipsecrequest_mode == 0) + return -EINVAL; + + t->id.proto = rq->sadb_x_ipsecrequest_proto; /* XXX check proto */ + t->mode = rq->sadb_x_ipsecrequest_mode-1; + if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_USE) + t->optional = 1; + else if (rq->sadb_x_ipsecrequest_level == IPSEC_LEVEL_UNIQUE) { + t->reqid = rq->sadb_x_ipsecrequest_reqid; + if (t->reqid > IPSEC_MANUAL_REQID_MAX) + t->reqid = 0; + if (!t->reqid && !(t->reqid = gen_reqid())) + return -ENOBUFS; + } + + /* addresses present only in tunnel mode */ + if (t->mode) { + switch (xp->family) { + case AF_INET: + sin = (void*)(rq+1); + if (sin->sin_family != AF_INET) + return -EINVAL; + t->saddr.a4 = sin->sin_addr.s_addr; + sin++; + if (sin->sin_family != AF_INET) + return -EINVAL; + t->id.daddr.a4 = sin->sin_addr.s_addr; + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + sin6 = (void *)(rq+1); + if (sin6->sin6_family != AF_INET6) + return -EINVAL; + memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); + sin6++; + if (sin6->sin6_family != AF_INET6) + return -EINVAL; + memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr)); + break; +#endif + default: + return -EINVAL; + } + } + /* No way to set this via kame pfkey */ + t->aalgos = t->ealgos = t->calgos = ~0; + xp->xfrm_nr++; + return 0; +} + +static int +parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol) +{ + int err; + int len = pol->sadb_x_policy_len*8 - sizeof(struct sadb_x_policy); + struct sadb_x_ipsecrequest *rq = (void*)(pol+1); + + while (len >= sizeof(struct sadb_x_ipsecrequest)) { + if ((err = parse_ipsecrequest(xp, rq)) < 0) + return err; + len -= rq->sadb_x_ipsecrequest_len; + rq = (void*)((u8*)rq + rq->sadb_x_ipsecrequest_len); + } + return 0; +} + +static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp) +{ + int sockaddr_size = pfkey_sockaddr_size(xp->family); + int socklen = (xp->family == AF_INET ? + sizeof(struct sockaddr_in) : + sizeof(struct sockaddr_in6)); + + return sizeof(struct sadb_msg) + + (sizeof(struct sadb_lifetime) * 3) + + (sizeof(struct sadb_address) * 2) + + (sockaddr_size * 2) + + sizeof(struct sadb_x_policy) + + (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) + + (socklen * 2))); +} + +static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp) +{ + struct sk_buff *skb; + int size; + + size = pfkey_xfrm_policy2msg_size(xp); + + skb = alloc_skb(size + 16, GFP_ATOMIC); + if (skb == NULL) + return ERR_PTR(-ENOBUFS); + + return skb; +} + +static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, int dir) +{ + struct sadb_msg *hdr; + struct sadb_address *addr; + struct sadb_lifetime *lifetime; + struct sadb_x_policy *pol; + struct sockaddr_in *sin; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + struct sockaddr_in6 *sin6; +#endif + int i; + int size; + int sockaddr_size = pfkey_sockaddr_size(xp->family); + int socklen = (xp->family == AF_INET ? + sizeof(struct sockaddr_in) : + sizeof(struct sockaddr_in6)); + + size = pfkey_xfrm_policy2msg_size(xp); + + /* call should fill header later */ + hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); + memset(hdr, 0, size); /* XXX do we need this ? */ + + /* src address */ + addr = (struct sadb_address*) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); + addr->sadb_address_prefixlen = xp->selector.prefixlen_s; + addr->sadb_address_reserved = 0; + /* src address */ + if (xp->family == AF_INET) { + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = xp->selector.saddr.a4; + sin->sin_port = xp->selector.sport; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (xp->family == AF_INET6) { + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = xp->selector.sport; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, xp->selector.saddr.a6, + sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } +#endif + else + BUG(); + + /* dst address */ + addr = (struct sadb_address*) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = pfkey_proto_from_xfrm(xp->selector.proto); + addr->sadb_address_prefixlen = xp->selector.prefixlen_d; + addr->sadb_address_reserved = 0; + if (xp->family == AF_INET) { + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = xp->selector.daddr.a4; + sin->sin_port = xp->selector.dport; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (xp->family == AF_INET6) { + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = xp->selector.dport; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, xp->selector.daddr.a6, + sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } +#endif + else + BUG(); + + /* hard time */ + lifetime = (struct sadb_lifetime *) skb_put(skb, + sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_HARD; + lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.hard_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.hard_byte_limit); + lifetime->sadb_lifetime_addtime = xp->lft.hard_add_expires_seconds; + lifetime->sadb_lifetime_usetime = xp->lft.hard_use_expires_seconds; + /* soft time */ + lifetime = (struct sadb_lifetime *) skb_put(skb, + sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_SOFT; + lifetime->sadb_lifetime_allocations = _X2KEY(xp->lft.soft_packet_limit); + lifetime->sadb_lifetime_bytes = _X2KEY(xp->lft.soft_byte_limit); + lifetime->sadb_lifetime_addtime = xp->lft.soft_add_expires_seconds; + lifetime->sadb_lifetime_usetime = xp->lft.soft_use_expires_seconds; + /* current time */ + lifetime = (struct sadb_lifetime *) skb_put(skb, + sizeof(struct sadb_lifetime)); + lifetime->sadb_lifetime_len = + sizeof(struct sadb_lifetime)/sizeof(uint64_t); + lifetime->sadb_lifetime_exttype = SADB_EXT_LIFETIME_CURRENT; + lifetime->sadb_lifetime_allocations = xp->curlft.packets; + lifetime->sadb_lifetime_bytes = xp->curlft.bytes; + lifetime->sadb_lifetime_addtime = xp->curlft.add_time; + lifetime->sadb_lifetime_usetime = xp->curlft.use_time; + + pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_type = IPSEC_POLICY_DISCARD; + if (xp->action == XFRM_POLICY_ALLOW) { + if (xp->xfrm_nr) + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; + else + pol->sadb_x_policy_type = IPSEC_POLICY_NONE; + } + pol->sadb_x_policy_dir = dir+1; + pol->sadb_x_policy_id = xp->index; + pol->sadb_x_policy_priority = xp->priority; + + for (i=0; i<xp->xfrm_nr; i++) { + struct sadb_x_ipsecrequest *rq; + struct xfrm_tmpl *t = xp->xfrm_vec + i; + int req_size; + + req_size = sizeof(struct sadb_x_ipsecrequest); + if (t->mode) + req_size += 2*socklen; + else + size -= 2*socklen; + rq = (void*)skb_put(skb, req_size); + pol->sadb_x_policy_len += req_size/8; + memset(rq, 0, sizeof(*rq)); + rq->sadb_x_ipsecrequest_len = req_size; + rq->sadb_x_ipsecrequest_proto = t->id.proto; + rq->sadb_x_ipsecrequest_mode = t->mode+1; + rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_REQUIRE; + if (t->reqid) + rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_UNIQUE; + if (t->optional) + rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE; + rq->sadb_x_ipsecrequest_reqid = t->reqid; + if (t->mode) { + switch (xp->family) { + case AF_INET: + sin = (void*)(rq+1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = t->saddr.a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + sin++; + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = t->id.daddr.a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + sin6 = (void*)(rq+1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, t->saddr.a6, + sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + + sin6++; + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, t->id.daddr.a6, + sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + break; +#endif + default: + break; + } + } + } + hdr->sadb_msg_len = size / sizeof(uint64_t); + hdr->sadb_msg_reserved = atomic_read(&xp->refcnt); +} + +static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + int err; + struct sadb_lifetime *lifetime; + struct sadb_address *sa; + struct sadb_x_policy *pol; + struct xfrm_policy *xp; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + + if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || + !ext_hdrs[SADB_X_EXT_POLICY-1]) + return -EINVAL; + + pol = ext_hdrs[SADB_X_EXT_POLICY-1]; + if (pol->sadb_x_policy_type > IPSEC_POLICY_IPSEC) + return -EINVAL; + if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) + return -EINVAL; + + xp = xfrm_policy_alloc(GFP_KERNEL); + if (xp == NULL) + return -ENOBUFS; + + xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? + XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); + xp->priority = pol->sadb_x_policy_priority; + + sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + xp->family = pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.saddr); + if (!xp->family) { + err = -EINVAL; + goto out; + } + xp->selector.family = xp->family; + xp->selector.prefixlen_s = sa->sadb_address_prefixlen; + xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + xp->selector.sport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (xp->selector.sport) + xp->selector.sport_mask = ~0; + + sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], + pfkey_sadb_addr2xfrm_addr(sa, &xp->selector.daddr); + xp->selector.prefixlen_d = sa->sadb_address_prefixlen; + + /* Amusing, we set this twice. KAME apps appear to set same value + * in both addresses. + */ + xp->selector.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + + xp->selector.dport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (xp->selector.dport) + xp->selector.dport_mask = ~0; + + xp->lft.soft_byte_limit = XFRM_INF; + xp->lft.hard_byte_limit = XFRM_INF; + xp->lft.soft_packet_limit = XFRM_INF; + xp->lft.hard_packet_limit = XFRM_INF; + if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_HARD-1]) != NULL) { + xp->lft.hard_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + xp->lft.hard_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + xp->lft.hard_add_expires_seconds = lifetime->sadb_lifetime_addtime; + xp->lft.hard_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + if ((lifetime = ext_hdrs[SADB_EXT_LIFETIME_SOFT-1]) != NULL) { + xp->lft.soft_packet_limit = _KEY2X(lifetime->sadb_lifetime_allocations); + xp->lft.soft_byte_limit = _KEY2X(lifetime->sadb_lifetime_bytes); + xp->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime; + xp->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime; + } + xp->xfrm_nr = 0; + if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && + (err = parse_ipsecrequests(xp, pol)) < 0) + goto out; + + out_skb = pfkey_xfrm_policy2msg_prep(xp); + if (IS_ERR(out_skb)) { + err = PTR_ERR(out_skb); + goto out; + } + + err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp, + hdr->sadb_msg_type != SADB_X_SPDUPDATE); + if (err) { + kfree_skb(out_skb); + goto out; + } + + pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1); + + xfrm_pol_put(xp); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = hdr->sadb_msg_type; + out_hdr->sadb_msg_satype = 0; + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk); + return 0; + +out: + kfree(xp); + return err; +} + +static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + int err; + struct sadb_address *sa; + struct sadb_x_policy *pol; + struct xfrm_policy *xp; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + struct xfrm_selector sel; + + if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + ext_hdrs[SADB_EXT_ADDRESS_DST-1]) || + !ext_hdrs[SADB_X_EXT_POLICY-1]) + return -EINVAL; + + pol = ext_hdrs[SADB_X_EXT_POLICY-1]; + if (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir >= IPSEC_DIR_MAX) + return -EINVAL; + + memset(&sel, 0, sizeof(sel)); + + sa = ext_hdrs[SADB_EXT_ADDRESS_SRC-1], + sel.family = pfkey_sadb_addr2xfrm_addr(sa, &sel.saddr); + sel.prefixlen_s = sa->sadb_address_prefixlen; + sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + sel.sport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (sel.sport) + sel.sport_mask = ~0; + + sa = ext_hdrs[SADB_EXT_ADDRESS_DST-1], + pfkey_sadb_addr2xfrm_addr(sa, &sel.daddr); + sel.prefixlen_d = sa->sadb_address_prefixlen; + sel.proto = pfkey_proto_to_xfrm(sa->sadb_address_proto); + sel.dport = ((struct sockaddr_in *)(sa+1))->sin_port; + if (sel.dport) + sel.dport_mask = ~0; + + xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1); + if (xp == NULL) + return -ENOENT; + + err = 0; + + out_skb = pfkey_xfrm_policy2msg_prep(xp); + if (IS_ERR(out_skb)) { + err = PTR_ERR(out_skb); + goto out; + } + pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = SADB_X_SPDDELETE; + out_hdr->sadb_msg_satype = 0; + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk); + err = 0; + +out: + xfrm_pol_put(xp); + return err; +} + +static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + int err; + struct sadb_x_policy *pol; + struct xfrm_policy *xp; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + + if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL) + return -EINVAL; + + xp = xfrm_policy_byid(0, pol->sadb_x_policy_id, + hdr->sadb_msg_type == SADB_X_SPDDELETE2); + if (xp == NULL) + return -ENOENT; + + err = 0; + + out_skb = pfkey_xfrm_policy2msg_prep(xp); + if (IS_ERR(out_skb)) { + err = PTR_ERR(out_skb); + goto out; + } + pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = hdr->sadb_msg_version; + out_hdr->sadb_msg_type = hdr->sadb_msg_type; + out_hdr->sadb_msg_satype = 0; + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_seq = hdr->sadb_msg_seq; + out_hdr->sadb_msg_pid = hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, sk); + err = 0; + +out: + xfrm_pol_put(xp); + return err; +} + +static int dump_sp(struct xfrm_policy *xp, int dir, int count, void *ptr) +{ + struct pfkey_dump_data *data = ptr; + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + + out_skb = pfkey_xfrm_policy2msg_prep(xp); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + pfkey_xfrm_policy2msg(out_skb, xp, dir); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = data->hdr->sadb_msg_version; + out_hdr->sadb_msg_type = SADB_X_SPDDUMP; + out_hdr->sadb_msg_satype = SADB_SATYPE_UNSPEC; + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_seq = count; + out_hdr->sadb_msg_pid = data->hdr->sadb_msg_pid; + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, data->sk); + return 0; +} + +static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct pfkey_dump_data data = { .skb = skb, .hdr = hdr, .sk = sk }; + + return xfrm_policy_walk(dump_sp, &data); +} + +static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs) +{ + struct sk_buff *skb_out; + struct sadb_msg *hdr_out; + + skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL); + if (!skb_out) + return -ENOBUFS; + + xfrm_policy_flush(); + + hdr_out = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg)); + pfkey_hdr_dup(hdr_out, hdr); + hdr_out->sadb_msg_errno = (uint8_t) 0; + hdr_out->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t)); + pfkey_broadcast(skb_out, GFP_KERNEL, BROADCAST_ALL, NULL); + + return 0; +} + +typedef int (*pfkey_handler)(struct sock *sk, struct sk_buff *skb, + struct sadb_msg *hdr, void **ext_hdrs); +static pfkey_handler pfkey_funcs[SADB_MAX + 1] = { + [SADB_RESERVED] = pfkey_reserved, + [SADB_GETSPI] = pfkey_getspi, + [SADB_UPDATE] = pfkey_add, + [SADB_ADD] = pfkey_add, + [SADB_DELETE] = pfkey_delete, + [SADB_GET] = pfkey_get, + [SADB_ACQUIRE] = pfkey_acquire, + [SADB_REGISTER] = pfkey_register, + [SADB_EXPIRE] = NULL, + [SADB_FLUSH] = pfkey_flush, + [SADB_DUMP] = pfkey_dump, + [SADB_X_PROMISC] = pfkey_promisc, + [SADB_X_PCHANGE] = NULL, + [SADB_X_SPDUPDATE] = pfkey_spdadd, + [SADB_X_SPDADD] = pfkey_spdadd, + [SADB_X_SPDDELETE] = pfkey_spddelete, + [SADB_X_SPDGET] = pfkey_spdget, + [SADB_X_SPDACQUIRE] = NULL, + [SADB_X_SPDDUMP] = pfkey_spddump, + [SADB_X_SPDFLUSH] = pfkey_spdflush, + [SADB_X_SPDSETIDX] = pfkey_spdadd, + [SADB_X_SPDDELETE2] = pfkey_spdget, +}; + +static int pfkey_process(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr) +{ + void *ext_hdrs[SADB_EXT_MAX]; + int err; + + pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, + BROADCAST_PROMISC_ONLY, NULL); + + memset(ext_hdrs, 0, sizeof(ext_hdrs)); + err = parse_exthdrs(skb, hdr, ext_hdrs); + if (!err) { + err = -EOPNOTSUPP; + if (pfkey_funcs[hdr->sadb_msg_type]) + err = pfkey_funcs[hdr->sadb_msg_type](sk, skb, hdr, ext_hdrs); + } + return err; +} + +static struct sadb_msg *pfkey_get_base_msg(struct sk_buff *skb, int *errp) +{ + struct sadb_msg *hdr = NULL; + + if (skb->len < sizeof(*hdr)) { + *errp = -EMSGSIZE; + } else { + hdr = (struct sadb_msg *) skb->data; + if (hdr->sadb_msg_version != PF_KEY_V2 || + hdr->sadb_msg_reserved != 0 || + (hdr->sadb_msg_type <= SADB_RESERVED || + hdr->sadb_msg_type > SADB_MAX)) { + hdr = NULL; + *errp = -EINVAL; + } else if (hdr->sadb_msg_len != (skb->len / + sizeof(uint64_t)) || + hdr->sadb_msg_len < (sizeof(struct sadb_msg) / + sizeof(uint64_t))) { + hdr = NULL; + *errp = -EMSGSIZE; + } else { + *errp = 0; + } + } + return hdr; +} + +static inline int aalg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) +{ + return t->aalgos & (1 << d->desc.sadb_alg_id); +} + +static inline int ealg_tmpl_set(struct xfrm_tmpl *t, struct xfrm_algo_desc *d) +{ + return t->ealgos & (1 << d->desc.sadb_alg_id); +} + +static int count_ah_combs(struct xfrm_tmpl *t) +{ + int i, sz = 0; + + for (i = 0; ; i++) { + struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); + if (!aalg) + break; + if (aalg_tmpl_set(t, aalg) && aalg->available) + sz += sizeof(struct sadb_comb); + } + return sz + sizeof(struct sadb_prop); +} + +static int count_esp_combs(struct xfrm_tmpl *t) +{ + int i, k, sz = 0; + + for (i = 0; ; i++) { + struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); + if (!ealg) + break; + + if (!(ealg_tmpl_set(t, ealg) && ealg->available)) + continue; + + for (k = 1; ; k++) { + struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); + if (!aalg) + break; + + if (aalg_tmpl_set(t, aalg) && aalg->available) + sz += sizeof(struct sadb_comb); + } + } + return sz + sizeof(struct sadb_prop); +} + +static void dump_ah_combs(struct sk_buff *skb, struct xfrm_tmpl *t) +{ + struct sadb_prop *p; + int i; + + p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); + p->sadb_prop_len = sizeof(struct sadb_prop)/8; + p->sadb_prop_exttype = SADB_EXT_PROPOSAL; + p->sadb_prop_replay = 32; + memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); + + for (i = 0; ; i++) { + struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(i); + if (!aalg) + break; + + if (aalg_tmpl_set(t, aalg) && aalg->available) { + struct sadb_comb *c; + c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); + memset(c, 0, sizeof(*c)); + p->sadb_prop_len += sizeof(struct sadb_comb)/8; + c->sadb_comb_auth = aalg->desc.sadb_alg_id; + c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; + c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; + c->sadb_comb_hard_addtime = 24*60*60; + c->sadb_comb_soft_addtime = 20*60*60; + c->sadb_comb_hard_usetime = 8*60*60; + c->sadb_comb_soft_usetime = 7*60*60; + } + } +} + +static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t) +{ + struct sadb_prop *p; + int i, k; + + p = (struct sadb_prop*)skb_put(skb, sizeof(struct sadb_prop)); + p->sadb_prop_len = sizeof(struct sadb_prop)/8; + p->sadb_prop_exttype = SADB_EXT_PROPOSAL; + p->sadb_prop_replay = 32; + memset(p->sadb_prop_reserved, 0, sizeof(p->sadb_prop_reserved)); + + for (i=0; ; i++) { + struct xfrm_algo_desc *ealg = xfrm_ealg_get_byidx(i); + if (!ealg) + break; + + if (!(ealg_tmpl_set(t, ealg) && ealg->available)) + continue; + + for (k = 1; ; k++) { + struct sadb_comb *c; + struct xfrm_algo_desc *aalg = xfrm_aalg_get_byidx(k); + if (!aalg) + break; + if (!(aalg_tmpl_set(t, aalg) && aalg->available)) + continue; + c = (struct sadb_comb*)skb_put(skb, sizeof(struct sadb_comb)); + memset(c, 0, sizeof(*c)); + p->sadb_prop_len += sizeof(struct sadb_comb)/8; + c->sadb_comb_auth = aalg->desc.sadb_alg_id; + c->sadb_comb_auth_minbits = aalg->desc.sadb_alg_minbits; + c->sadb_comb_auth_maxbits = aalg->desc.sadb_alg_maxbits; + c->sadb_comb_encrypt = ealg->desc.sadb_alg_id; + c->sadb_comb_encrypt_minbits = ealg->desc.sadb_alg_minbits; + c->sadb_comb_encrypt_maxbits = ealg->desc.sadb_alg_maxbits; + c->sadb_comb_hard_addtime = 24*60*60; + c->sadb_comb_soft_addtime = 20*60*60; + c->sadb_comb_hard_usetime = 8*60*60; + c->sadb_comb_soft_usetime = 7*60*60; + } + } +} + +static int pfkey_send_notify(struct xfrm_state *x, int hard) +{ + struct sk_buff *out_skb; + struct sadb_msg *out_hdr; + int hsc = (hard ? 2 : 1); + + out_skb = pfkey_xfrm_state2msg(x, 0, hsc); + if (IS_ERR(out_skb)) + return PTR_ERR(out_skb); + + out_hdr = (struct sadb_msg *) out_skb->data; + out_hdr->sadb_msg_version = PF_KEY_V2; + out_hdr->sadb_msg_type = SADB_EXPIRE; + out_hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + out_hdr->sadb_msg_errno = 0; + out_hdr->sadb_msg_reserved = 0; + out_hdr->sadb_msg_seq = 0; + out_hdr->sadb_msg_pid = 0; + + pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); + return 0; +} + +static u32 get_acqseq(void) +{ + u32 res; + static u32 acqseq; + static DEFINE_SPINLOCK(acqseq_lock); + + spin_lock_bh(&acqseq_lock); + res = (++acqseq ? : ++acqseq); + spin_unlock_bh(&acqseq_lock); + return res; +} + +static int pfkey_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *xp, int dir) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sadb_address *addr; + struct sadb_x_policy *pol; + struct sockaddr_in *sin; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + struct sockaddr_in6 *sin6; +#endif + int sockaddr_size; + int size; + + sockaddr_size = pfkey_sockaddr_size(x->props.family); + if (!sockaddr_size) + return -EINVAL; + + size = sizeof(struct sadb_msg) + + (sizeof(struct sadb_address) * 2) + + (sockaddr_size * 2) + + sizeof(struct sadb_x_policy); + + if (x->id.proto == IPPROTO_AH) + size += count_ah_combs(t); + else if (x->id.proto == IPPROTO_ESP) + size += count_esp_combs(t); + + skb = alloc_skb(size + 16, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_type = SADB_ACQUIRE; + hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto); + hdr->sadb_msg_len = size / sizeof(uint64_t); + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_reserved = 0; + hdr->sadb_msg_seq = x->km.seq = get_acqseq(); + hdr->sadb_msg_pid = 0; + + /* src address */ + addr = (struct sadb_address*) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + if (x->props.family == AF_INET) { + addr->sadb_address_prefixlen = 32; + + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = x->props.saddr.a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (x->props.family == AF_INET6) { + addr->sadb_address_prefixlen = 128; + + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, + x->props.saddr.a6, sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } +#endif + else + BUG(); + + /* dst address */ + addr = (struct sadb_address*) skb_put(skb, + sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + if (x->props.family == AF_INET) { + addr->sadb_address_prefixlen = 32; + + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = x->id.daddr.a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (x->props.family == AF_INET6) { + addr->sadb_address_prefixlen = 128; + + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, + x->id.daddr.a6, sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } +#endif + else + BUG(); + + pol = (struct sadb_x_policy *) skb_put(skb, sizeof(struct sadb_x_policy)); + pol->sadb_x_policy_len = sizeof(struct sadb_x_policy)/sizeof(uint64_t); + pol->sadb_x_policy_exttype = SADB_X_EXT_POLICY; + pol->sadb_x_policy_type = IPSEC_POLICY_IPSEC; + pol->sadb_x_policy_dir = dir+1; + pol->sadb_x_policy_id = xp->index; + + /* Set sadb_comb's. */ + if (x->id.proto == IPPROTO_AH) + dump_ah_combs(skb, t); + else if (x->id.proto == IPPROTO_ESP) + dump_esp_combs(skb, t); + + return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); +} + +static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt, + u8 *data, int len, int *dir) +{ + struct xfrm_policy *xp; + struct sadb_x_policy *pol = (struct sadb_x_policy*)data; + + switch (family) { + case AF_INET: + if (opt != IP_IPSEC_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + case AF_INET6: + if (opt != IPV6_IPSEC_POLICY) { + *dir = -EOPNOTSUPP; + return NULL; + } + break; +#endif + default: + *dir = -EINVAL; + return NULL; + } + + *dir = -EINVAL; + + if (len < sizeof(struct sadb_x_policy) || + pol->sadb_x_policy_len*8 > len || + pol->sadb_x_policy_type > IPSEC_POLICY_BYPASS || + (!pol->sadb_x_policy_dir || pol->sadb_x_policy_dir > IPSEC_DIR_OUTBOUND)) + return NULL; + + xp = xfrm_policy_alloc(GFP_ATOMIC); + if (xp == NULL) { + *dir = -ENOBUFS; + return NULL; + } + + xp->action = (pol->sadb_x_policy_type == IPSEC_POLICY_DISCARD ? + XFRM_POLICY_BLOCK : XFRM_POLICY_ALLOW); + + xp->lft.soft_byte_limit = XFRM_INF; + xp->lft.hard_byte_limit = XFRM_INF; + xp->lft.soft_packet_limit = XFRM_INF; + xp->lft.hard_packet_limit = XFRM_INF; + xp->family = family; + + xp->xfrm_nr = 0; + if (pol->sadb_x_policy_type == IPSEC_POLICY_IPSEC && + (*dir = parse_ipsecrequests(xp, pol)) < 0) + goto out; + + *dir = pol->sadb_x_policy_dir-1; + return xp; + +out: + kfree(xp); + return NULL; +} + +static int pfkey_send_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, u16 sport) +{ + struct sk_buff *skb; + struct sadb_msg *hdr; + struct sadb_sa *sa; + struct sadb_address *addr; + struct sadb_x_nat_t_port *n_port; + struct sockaddr_in *sin; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + struct sockaddr_in6 *sin6; +#endif + int sockaddr_size; + int size; + __u8 satype = (x->id.proto == IPPROTO_ESP ? SADB_SATYPE_ESP : 0); + struct xfrm_encap_tmpl *natt = NULL; + + sockaddr_size = pfkey_sockaddr_size(x->props.family); + if (!sockaddr_size) + return -EINVAL; + + if (!satype) + return -EINVAL; + + if (!x->encap) + return -EINVAL; + + natt = x->encap; + + /* Build an SADB_X_NAT_T_NEW_MAPPING message: + * + * HDR | SA | ADDRESS_SRC (old addr) | NAT_T_SPORT (old port) | + * ADDRESS_DST (new addr) | NAT_T_DPORT (new port) + */ + + size = sizeof(struct sadb_msg) + + sizeof(struct sadb_sa) + + (sizeof(struct sadb_address) * 2) + + (sockaddr_size * 2) + + (sizeof(struct sadb_x_nat_t_port) * 2); + + skb = alloc_skb(size + 16, GFP_ATOMIC); + if (skb == NULL) + return -ENOMEM; + + hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg)); + hdr->sadb_msg_version = PF_KEY_V2; + hdr->sadb_msg_type = SADB_X_NAT_T_NEW_MAPPING; + hdr->sadb_msg_satype = satype; + hdr->sadb_msg_len = size / sizeof(uint64_t); + hdr->sadb_msg_errno = 0; + hdr->sadb_msg_reserved = 0; + hdr->sadb_msg_seq = x->km.seq = get_acqseq(); + hdr->sadb_msg_pid = 0; + + /* SA */ + sa = (struct sadb_sa *) skb_put(skb, sizeof(struct sadb_sa)); + sa->sadb_sa_len = sizeof(struct sadb_sa)/sizeof(uint64_t); + sa->sadb_sa_exttype = SADB_EXT_SA; + sa->sadb_sa_spi = x->id.spi; + sa->sadb_sa_replay = 0; + sa->sadb_sa_state = 0; + sa->sadb_sa_auth = 0; + sa->sadb_sa_encrypt = 0; + sa->sadb_sa_flags = 0; + + /* ADDRESS_SRC (old addr) */ + addr = (struct sadb_address*) + skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_SRC; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + if (x->props.family == AF_INET) { + addr->sadb_address_prefixlen = 32; + + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = x->props.saddr.a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (x->props.family == AF_INET6) { + addr->sadb_address_prefixlen = 128; + + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, + x->props.saddr.a6, sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } +#endif + else + BUG(); + + /* NAT_T_SPORT (old port) */ + n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_SPORT; + n_port->sadb_x_nat_t_port_port = natt->encap_sport; + n_port->sadb_x_nat_t_port_reserved = 0; + + /* ADDRESS_DST (new addr) */ + addr = (struct sadb_address*) + skb_put(skb, sizeof(struct sadb_address)+sockaddr_size); + addr->sadb_address_len = + (sizeof(struct sadb_address)+sockaddr_size)/ + sizeof(uint64_t); + addr->sadb_address_exttype = SADB_EXT_ADDRESS_DST; + addr->sadb_address_proto = 0; + addr->sadb_address_reserved = 0; + if (x->props.family == AF_INET) { + addr->sadb_address_prefixlen = 32; + + sin = (struct sockaddr_in *) (addr + 1); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = ipaddr->a4; + sin->sin_port = 0; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + else if (x->props.family == AF_INET6) { + addr->sadb_address_prefixlen = 128; + + sin6 = (struct sockaddr_in6 *) (addr + 1); + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_flowinfo = 0; + memcpy(&sin6->sin6_addr, &ipaddr->a6, sizeof(struct in6_addr)); + sin6->sin6_scope_id = 0; + } +#endif + else + BUG(); + + /* NAT_T_DPORT (new port) */ + n_port = (struct sadb_x_nat_t_port*) skb_put(skb, sizeof (*n_port)); + n_port->sadb_x_nat_t_port_len = sizeof(*n_port)/sizeof(uint64_t); + n_port->sadb_x_nat_t_port_exttype = SADB_X_EXT_NAT_T_DPORT; + n_port->sadb_x_nat_t_port_port = sport; + n_port->sadb_x_nat_t_port_reserved = 0; + + return pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_REGISTERED, NULL); +} + +static int pfkey_sendmsg(struct kiocb *kiocb, + struct socket *sock, struct msghdr *msg, size_t len) +{ + struct sock *sk = sock->sk; + struct sk_buff *skb = NULL; + struct sadb_msg *hdr = NULL; + int err; + + err = -EOPNOTSUPP; + if (msg->msg_flags & MSG_OOB) + goto out; + + err = -EMSGSIZE; + if ((unsigned)len > sk->sk_sndbuf - 32) + goto out; + + err = -ENOBUFS; + skb = alloc_skb(len, GFP_KERNEL); + if (skb == NULL) + goto out; + + err = -EFAULT; + if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) + goto out; + + hdr = pfkey_get_base_msg(skb, &err); + if (!hdr) + goto out; + + down(&xfrm_cfg_sem); + err = pfkey_process(sk, skb, hdr); + up(&xfrm_cfg_sem); + +out: + if (err && hdr && pfkey_error(hdr, err, sk) == 0) + err = 0; + if (skb) + kfree_skb(skb); + + return err ? : len; +} + +static int pfkey_recvmsg(struct kiocb *kiocb, + struct socket *sock, struct msghdr *msg, size_t len, + int flags) +{ + struct sock *sk = sock->sk; + struct sk_buff *skb; + int copied, err; + + err = -EINVAL; + if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT)) + goto out; + + msg->msg_namelen = 0; + skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); + if (skb == NULL) + goto out; + + copied = skb->len; + if (copied > len) { + msg->msg_flags |= MSG_TRUNC; + copied = len; + } + + skb->h.raw = skb->data; + err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); + if (err) + goto out_free; + + sock_recv_timestamp(msg, sk, skb); + + err = (flags & MSG_TRUNC) ? skb->len : copied; + +out_free: + skb_free_datagram(sk, skb); +out: + return err; +} + +static struct proto_ops pfkey_ops = { + .family = PF_KEY, + .owner = THIS_MODULE, + /* Operations that make no sense on pfkey sockets. */ + .bind = sock_no_bind, + .connect = sock_no_connect, + .socketpair = sock_no_socketpair, + .accept = sock_no_accept, + .getname = sock_no_getname, + .ioctl = sock_no_ioctl, + .listen = sock_no_listen, + .shutdown = sock_no_shutdown, + .setsockopt = sock_no_setsockopt, + .getsockopt = sock_no_getsockopt, + .mmap = sock_no_mmap, + .sendpage = sock_no_sendpage, + + /* Now the operations that really occur. */ + .release = pfkey_release, + .poll = datagram_poll, + .sendmsg = pfkey_sendmsg, + .recvmsg = pfkey_recvmsg, +}; + +static struct net_proto_family pfkey_family_ops = { + .family = PF_KEY, + .create = pfkey_create, + .owner = THIS_MODULE, +}; + +#ifdef CONFIG_PROC_FS +static int pfkey_read_proc(char *buffer, char **start, off_t offset, + int length, int *eof, void *data) +{ + off_t pos = 0; + off_t begin = 0; + int len = 0; + struct sock *s; + struct hlist_node *node; + + len += sprintf(buffer,"sk RefCnt Rmem Wmem User Inode\n"); + + read_lock(&pfkey_table_lock); + + sk_for_each(s, node, &pfkey_table) { + len += sprintf(buffer+len,"%p %-6d %-6u %-6u %-6u %-6lu", + s, + atomic_read(&s->sk_refcnt), + atomic_read(&s->sk_rmem_alloc), + atomic_read(&s->sk_wmem_alloc), + sock_i_uid(s), + sock_i_ino(s) + ); + + buffer[len++] = '\n'; + + pos = begin + len; + if (pos < offset) { + len = 0; + begin = pos; + } + if(pos > offset + length) + goto done; + } + *eof = 1; + +done: + read_unlock(&pfkey_table_lock); + + *start = buffer + (offset - begin); + len -= (offset - begin); + + if (len > length) + len = length; + if (len < 0) + len = 0; + + return len; +} +#endif + +static struct xfrm_mgr pfkeyv2_mgr = +{ + .id = "pfkeyv2", + .notify = pfkey_send_notify, + .acquire = pfkey_send_acquire, + .compile_policy = pfkey_compile_policy, + .new_mapping = pfkey_send_new_mapping, +}; + +static void __exit ipsec_pfkey_exit(void) +{ + xfrm_unregister_km(&pfkeyv2_mgr); + remove_proc_entry("net/pfkey", NULL); + sock_unregister(PF_KEY); + proto_unregister(&key_proto); +} + +static int __init ipsec_pfkey_init(void) +{ + int err = proto_register(&key_proto, 0); + + if (err != 0) + goto out; + + err = sock_register(&pfkey_family_ops); + if (err != 0) + goto out_unregister_key_proto; +#ifdef CONFIG_PROC_FS + err = -ENOMEM; + if (create_proc_read_entry("net/pfkey", 0, NULL, pfkey_read_proc, NULL) == NULL) + goto out_sock_unregister; +#endif + err = xfrm_register_km(&pfkeyv2_mgr); + if (err != 0) + goto out_remove_proc_entry; +out: + return err; +out_remove_proc_entry: +#ifdef CONFIG_PROC_FS + remove_proc_entry("net/pfkey", NULL); +out_sock_unregister: +#endif + sock_unregister(PF_KEY); +out_unregister_key_proto: + proto_unregister(&key_proto); + goto out; +} + +module_init(ipsec_pfkey_init); +module_exit(ipsec_pfkey_exit); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_NETPROTO(PF_KEY); |