1 files changed, 378 insertions, 19 deletions

diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 7de17559249a..81d1005830f4 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -28,8 +28,6 @@
 #include <net/netlink.h>
 #include <asm/uaccess.h>
 
-static struct sock *xfrm_nl;
-
 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
 {
         struct rtattr *rt = xfrma[type - 1];
@@ -103,9 +101,6 @@ static inline int verify_sec_ctx_len(struct rtattr **xfrma)
 
         uctx = RTA_DATA(rt);
 
-        if (uctx->ctx_len > PAGE_SIZE)
-                return -EINVAL;
-
         len += sizeof(struct xfrm_user_sec_ctx);
         len += uctx->ctx_len;
 
@@ -276,6 +271,56 @@ static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *
         x->props.flags = p->flags;
 }
 
+/*
+ * someday when pfkey also has support, we could have the code
+ * somehow made shareable and move it to xfrm_state.c - JHS
+ *
+*/
+static int xfrm_update_ae_params(struct xfrm_state *x, struct rtattr **xfrma)
+{
+        int err = - EINVAL;
+        struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
+        struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
+        struct rtattr *et = xfrma[XFRMA_ETIMER_THRESH-1];
+        struct rtattr *rt = xfrma[XFRMA_REPLAY_THRESH-1];
+
+        if (rp) {
+                struct xfrm_replay_state *replay;
+                if (RTA_PAYLOAD(rp) < sizeof(*replay))
+                        goto error;
+                replay = RTA_DATA(rp);
+                memcpy(&x->replay, replay, sizeof(*replay));
+                memcpy(&x->preplay, replay, sizeof(*replay));
+        }
+
+        if (lt) {
+                struct xfrm_lifetime_cur *ltime;
+                if (RTA_PAYLOAD(lt) < sizeof(*ltime))
+                        goto error;
+                ltime = RTA_DATA(lt);
+                x->curlft.bytes = ltime->bytes;
+                x->curlft.packets = ltime->packets;
+                x->curlft.add_time = ltime->add_time;
+                x->curlft.use_time = ltime->use_time;
+        }
+
+        if (et) {
+                if (RTA_PAYLOAD(et) < sizeof(u32))
+                        goto error;
+                x->replay_maxage = *(u32*)RTA_DATA(et);
+        }
+
+        if (rt) {
+                if (RTA_PAYLOAD(rt) < sizeof(u32))
+                        goto error;
+                x->replay_maxdiff = *(u32*)RTA_DATA(rt);
+        }
+
+        return 0;
+error:
+        return err;
+}
+
 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
                                                struct rtattr **xfrma,
                                                int *errp)
@@ -311,6 +356,18 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
                 goto error;
 
         x->km.seq = p->seq;
+        x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
+        /* sysctl_xfrm_aevent_etime is in 100ms units */
+        x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
+        x->preplay.bitmap = 0;
+        x->preplay.seq = x->replay.seq+x->replay_maxdiff;
+        x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
+
+        /* override default values from above */
+
+        err = xfrm_update_ae_params(x, (struct rtattr **)xfrma);
+        if (err < 0)
+                goto error;
 
         return x;
 
@@ -1025,9 +1082,142 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma
         return 0;
 }
 
-static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+
+static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
+{
+        struct xfrm_aevent_id *id;
+        struct nlmsghdr *nlh;
+        struct xfrm_lifetime_cur ltime;
+        unsigned char *b = skb->tail;
+
+        nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id));
+        id = NLMSG_DATA(nlh);
+        nlh->nlmsg_flags = 0;
+
+        id->sa_id.daddr = x->id.daddr;
+        id->sa_id.spi = x->id.spi;
+        id->sa_id.family = x->props.family;
+        id->sa_id.proto = x->id.proto;
+        id->flags = c->data.aevent;
+
+        RTA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
+
+        ltime.bytes = x->curlft.bytes;
+        ltime.packets = x->curlft.packets;
+        ltime.add_time = x->curlft.add_time;
+        ltime.use_time = x->curlft.use_time;
+
+        RTA_PUT(skb, XFRMA_LTIME_VAL, sizeof(struct xfrm_lifetime_cur), &ltime);
+
+        if (id->flags&XFRM_AE_RTHR) {
+                RTA_PUT(skb,XFRMA_REPLAY_THRESH,sizeof(u32),&x->replay_maxdiff);
+        }
+
+        if (id->flags&XFRM_AE_ETHR) {
+                u32 etimer = x->replay_maxage*10/HZ;
+                RTA_PUT(skb,XFRMA_ETIMER_THRESH,sizeof(u32),&etimer);
+        }
+
+        nlh->nlmsg_len = skb->tail - b;
+        return skb->len;
+
+rtattr_failure:
+nlmsg_failure:
+        skb_trim(skb, b - skb->data);
+        return -1;
+}
+
+static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+        struct xfrm_state *x;
+        struct sk_buff *r_skb;
+        int err;
+        struct km_event c;
+        struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
+        int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
+        struct xfrm_usersa_id *id = &p->sa_id;
+
+        len += RTA_SPACE(sizeof(struct xfrm_replay_state));
+        len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
+
+        if (p->flags&XFRM_AE_RTHR)
+                len+=RTA_SPACE(sizeof(u32));
+
+        if (p->flags&XFRM_AE_ETHR)
+                len+=RTA_SPACE(sizeof(u32));
+
+        r_skb = alloc_skb(len, GFP_ATOMIC);
+        if (r_skb == NULL)
+                return -ENOMEM;
+
+        x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
+        if (x == NULL) {
+                kfree(r_skb);
+                return -ESRCH;
+        }
+
+        /*
+         * XXX: is this lock really needed - none of the other
+         * gets lock (the concern is things getting updated
+         * while we are still reading) - jhs
+        */
+        spin_lock_bh(&x->lock);
+        c.data.aevent = p->flags;
+        c.seq = nlh->nlmsg_seq;
+        c.pid = nlh->nlmsg_pid;
+
+        if (build_aevent(r_skb, x, &c) < 0)
+                BUG();
+        err = netlink_unicast(xfrm_nl, r_skb,
+                              NETLINK_CB(skb).pid, MSG_DONTWAIT);
+        spin_unlock_bh(&x->lock);
+        xfrm_state_put(x);
+        return err;
+}
+
+static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
 {
+        struct xfrm_state *x;
         struct km_event c;
+        int err = - EINVAL;
+        struct xfrm_aevent_id *p = NLMSG_DATA(nlh);
+        struct rtattr *rp = xfrma[XFRMA_REPLAY_VAL-1];
+        struct rtattr *lt = xfrma[XFRMA_LTIME_VAL-1];
+
+        if (!lt && !rp)
+                return err;
+
+        /* pedantic mode - thou shalt sayeth replaceth */
+        if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
+                return err;
+
+        x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
+        if (x == NULL)
+                return -ESRCH;
+
+        if (x->km.state != XFRM_STATE_VALID)
+                goto out;
+
+        spin_lock_bh(&x->lock);
+        err = xfrm_update_ae_params(x,(struct rtattr **)xfrma);
+        spin_unlock_bh(&x->lock);
+        if (err < 0)
+                goto out;
+
+        c.event = nlh->nlmsg_type;
+        c.seq = nlh->nlmsg_seq;
+        c.pid = nlh->nlmsg_pid;
+        c.data.aevent = XFRM_AE_CU;
+        km_state_notify(x, &c);
+        err = 0;
+out:
+        xfrm_state_put(x);
+        return err;
+}
+
+static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+struct km_event c;
 
         xfrm_policy_flush();
         c.event = nlh->nlmsg_type;
@@ -1037,6 +1227,139 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **x
         return 0;
 }
 
+static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+        struct xfrm_policy *xp;
+        struct xfrm_user_polexpire *up = NLMSG_DATA(nlh);
+        struct xfrm_userpolicy_info *p = &up->pol;
+        int err = -ENOENT;
+
+        if (p->index)
+                xp = xfrm_policy_byid(p->dir, p->index, 0);
+        else {
+                struct rtattr **rtattrs = (struct rtattr **)xfrma;
+                struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
+                struct xfrm_policy tmp;
+
+                err = verify_sec_ctx_len(rtattrs);
+                if (err)
+                        return err;
+
+                memset(&tmp, 0, sizeof(struct xfrm_policy));
+                if (rt) {
+                        struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+                        if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
+                                return err;
+                }
+                xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, 0);
+                security_xfrm_policy_free(&tmp);
+        }
+
+        if (xp == NULL)
+                return err;
+                                                                                        read_lock(&xp->lock);
+        if (xp->dead) {
+                read_unlock(&xp->lock);
+                goto out;
+        }
+
+        read_unlock(&xp->lock);
+        err = 0;
+        if (up->hard) {
+                xfrm_policy_delete(xp, p->dir);
+        } else {
+                // reset the timers here?
+                printk("Dont know what to do with soft policy expire\n");
+        }
+        km_policy_expired(xp, p->dir, up->hard, current->pid);
+
+out:
+        xfrm_pol_put(xp);
+        return err;
+}
+
+static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+        struct xfrm_state *x;
+        int err;
+        struct xfrm_user_expire *ue = NLMSG_DATA(nlh);
+        struct xfrm_usersa_info *p = &ue->state;
+
+        x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
+                err = -ENOENT;
+
+        if (x == NULL)
+                return err;
+
+        err = -EINVAL;
+
+        spin_lock_bh(&x->lock);
+        if (x->km.state != XFRM_STATE_VALID)
+                goto out;
+        km_state_expired(x, ue->hard, current->pid);
+
+        if (ue->hard)
+                __xfrm_state_delete(x);
+out:
+        spin_unlock_bh(&x->lock);
+        xfrm_state_put(x);
+        return err;
+}
+
+static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
+{
+        struct xfrm_policy *xp;
+        struct xfrm_user_tmpl *ut;
+        int i;
+        struct rtattr *rt = xfrma[XFRMA_TMPL-1];
+
+        struct xfrm_user_acquire *ua = NLMSG_DATA(nlh);
+        struct xfrm_state *x = xfrm_state_alloc();
+        int err = -ENOMEM;
+
+        if (!x)
+                return err;
+
+        err = verify_newpolicy_info(&ua->policy);
+        if (err) {
+                printk("BAD policy passed\n");
+                kfree(x);
+                return err;
+        }
+
+        /*   build an XP */
+        xp = xfrm_policy_construct(&ua->policy, (struct rtattr **) xfrma, &err);        if (!xp) {
+                kfree(x);
+                return err;
+        }
+
+        memcpy(&x->id, &ua->id, sizeof(ua->id));
+        memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
+        memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
+
+        ut = RTA_DATA(rt);
+        /* extract the templates and for each call km_key */
+        for (i = 0; i < xp->xfrm_nr; i++, ut++) {
+                struct xfrm_tmpl *t = &xp->xfrm_vec[i];
+                memcpy(&x->id, &t->id, sizeof(x->id));
+                x->props.mode = t->mode;
+                x->props.reqid = t->reqid;
+                x->props.family = ut->family;
+                t->aalgos = ua->aalgos;
+                t->ealgos = ua->ealgos;
+                t->calgos = ua->calgos;
+                err = km_query(x, t, xp);
+
+        }
+
+        kfree(x);
+        kfree(xp);
+
+        return 0;
+}
+
+
 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
 
 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
@@ -1054,6 +1377,8 @@ static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
         [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
+        [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
+        [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
 };
 
 #undef XMSGSIZE
@@ -1071,10 +1396,15 @@ static struct xfrm_link {
         [XFRM_MSG_GETPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
                                                    .dump = xfrm_dump_policy   },
         [XFRM_MSG_ALLOCSPI    - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
+        [XFRM_MSG_ACQUIRE     - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire   },
+        [XFRM_MSG_EXPIRE      - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
         [XFRM_MSG_UPDPOLICY   - XFRM_MSG_BASE] = { .doit = xfrm_add_policy    },
         [XFRM_MSG_UPDSA       - XFRM_MSG_BASE] = { .doit = xfrm_add_sa        },
+        [XFRM_MSG_POLEXPIRE   - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
         [XFRM_MSG_FLUSHSA     - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa      },
         [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy  },
+        [XFRM_MSG_NEWAE       - XFRM_MSG_BASE] = { .doit = xfrm_new_ae  },
+        [XFRM_MSG_GETAE       - XFRM_MSG_BASE] = { .doit = xfrm_get_ae  },
 };
 
 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
@@ -1156,26 +1486,26 @@ static void xfrm_netlink_rcv(struct sock *sk, int len)
         unsigned int qlen = 0;
 
         do {
-                down(&xfrm_cfg_sem);
+                mutex_lock(&xfrm_cfg_mutex);
                 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
-                up(&xfrm_cfg_sem);
+                mutex_unlock(&xfrm_cfg_mutex);
 
         } while (qlen);
 }
 
-static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
+static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
 {
         struct xfrm_user_expire *ue;
         struct nlmsghdr *nlh;
         unsigned char *b = skb->tail;
 
-        nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
+        nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_EXPIRE,
                         sizeof(*ue));
         ue = NLMSG_DATA(nlh);
         nlh->nlmsg_flags = 0;
 
         copy_to_user_state(x, &ue->state);
-        ue->hard = (hard != 0) ? 1 : 0;
+        ue->hard = (c->data.hard != 0) ? 1 : 0;
 
         nlh->nlmsg_len = skb->tail - b;
         return skb->len;
@@ -1194,13 +1524,31 @@ static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
         if (skb == NULL)
                 return -ENOMEM;
 
-        if (build_expire(skb, x, c->data.hard) < 0)
+        if (build_expire(skb, x, c) < 0)
                 BUG();
 
         NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
         return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
 }
 
+static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
+{
+        struct sk_buff *skb;
+        int len = NLMSG_LENGTH(sizeof(struct xfrm_aevent_id));
+
+        len += RTA_SPACE(sizeof(struct xfrm_replay_state));
+        len += RTA_SPACE(sizeof(struct xfrm_lifetime_cur));
+        skb = alloc_skb(len, GFP_ATOMIC);
+        if (skb == NULL)
+                return -ENOMEM;
+
+        if (build_aevent(skb, x, c) < 0)
+                BUG();
+
+        NETLINK_CB(skb).dst_group = XFRMNLGRP_AEVENTS;
+        return netlink_broadcast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
+}
+
 static int xfrm_notify_sa_flush(struct km_event *c)
 {
         struct xfrm_usersa_flush *p;
@@ -1313,6 +1661,8 @@ static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
         switch (c->event) {
         case XFRM_MSG_EXPIRE:
                 return xfrm_exp_state_notify(x, c);
+        case XFRM_MSG_NEWAE:
+                return xfrm_aevent_state_notify(x, c);
         case XFRM_MSG_DELSA:
         case XFRM_MSG_UPDSA:
         case XFRM_MSG_NEWSA:
@@ -1443,13 +1793,14 @@ static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
 }
 
 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
-                           int dir, int hard)
+                           int dir, struct km_event *c)
 {
         struct xfrm_user_polexpire *upe;
         struct nlmsghdr *nlh;
+        int hard = c->data.hard;
         unsigned char *b = skb->tail;
 
-        nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
+        nlh = NLMSG_PUT(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
         upe = NLMSG_DATA(nlh);
         nlh->nlmsg_flags = 0;
 
@@ -1480,7 +1831,7 @@ static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_eve
         if (skb == NULL)
                 return -ENOMEM;
 
-        if (build_polexpire(skb, xp, dir, c->data.hard) < 0)
+        if (build_polexpire(skb, xp, dir, c) < 0)
                 BUG();
 
         NETLINK_CB(skb).dst_group = XFRMNLGRP_EXPIRE;
@@ -1596,12 +1947,15 @@ static struct xfrm_mgr netlink_mgr = {
 
 static int __init xfrm_user_init(void)
 {
+        struct sock *nlsk;
+
         printk(KERN_INFO "Initializing IPsec netlink socket\n");
 
-        xfrm_nl = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
-                                        xfrm_netlink_rcv, THIS_MODULE);
-        if (xfrm_nl == NULL)
+        nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
+                                     xfrm_netlink_rcv, THIS_MODULE);
+        if (nlsk == NULL)
                 return -ENOMEM;
+        rcu_assign_pointer(xfrm_nl, nlsk);
 
         xfrm_register_km(&netlink_mgr);
 
@@ -1610,11 +1964,16 @@ static int __init xfrm_user_init(void)
 
 static void __exit xfrm_user_exit(void)
 {
+        struct sock *nlsk = xfrm_nl;
+
         xfrm_unregister_km(&netlink_mgr);
-        sock_release(xfrm_nl->sk_socket);
+        rcu_assign_pointer(xfrm_nl, NULL);
+        synchronize_rcu();
+        sock_release(nlsk->sk_socket);
 }
 
 module_init(xfrm_user_init);
 module_exit(xfrm_user_exit);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
+