[IPSEC] Add complete xfrm event notification

Heres the final patch.
What this patch provides

- netlink xfrm events
- ability to have events generated by netlink propagated to pfkey
  and vice versa.
- fixes the acquire lets-be-happy-with-one-success issue

Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 267 insertions, 90 deletions

diff --git a/net/key/af_key.c b/net/key/af_key.c
index ce980aa94ed..d086c117f5f 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1240,13 +1240,85 @@ static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *
         return 0;
 }
 
+static inline int event2poltype(int event)
+{
+        switch (event) {
+        case XFRM_SAP_DELETED:
+                return SADB_X_SPDDELETE;
+        case XFRM_SAP_ADDED:
+                return SADB_X_SPDADD;
+        case XFRM_SAP_UPDATED:
+                return SADB_X_SPDUPDATE;
+        case XFRM_SAP_EXPIRED:
+        //      return SADB_X_SPDEXPIRE;
+        default:
+                printk("pfkey: Unknown policy event %d\n", event);
+                break;
+        }
+
+        return 0;
+}
+
+static inline int event2keytype(int event)
+{
+        switch (event) {
+        case XFRM_SAP_DELETED:
+                return SADB_DELETE;
+        case XFRM_SAP_ADDED:
+                return SADB_ADD;
+        case XFRM_SAP_UPDATED:
+                return SADB_UPDATE;
+        case XFRM_SAP_EXPIRED:
+                return SADB_EXPIRE;
+        default:
+                printk("pfkey: Unknown SA event %d\n", event);
+                break;
+        }
+
+        return 0;
+}
+
+/* ADD/UPD/DEL */
+static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
+{
+        struct sk_buff *skb;
+        struct sadb_msg *hdr;
+        int hsc = 3;
+
+        if (c->event == XFRM_SAP_DELETED)
+                hsc = 0;
+
+        if (c->event == XFRM_SAP_EXPIRED) {
+                if (c->data)
+                        hsc = 2;
+                else
+                        hsc = 1;
+        }
+
+        skb = pfkey_xfrm_state2msg(x, 0, hsc);
+
+        if (IS_ERR(skb))
+                return PTR_ERR(skb);
+
+        hdr = (struct sadb_msg *) skb->data;
+        hdr->sadb_msg_version = PF_KEY_V2;
+        hdr->sadb_msg_type = event2keytype(c->event);
+        hdr->sadb_msg_satype = pfkey_proto2satype(x->id.proto);
+        hdr->sadb_msg_errno = 0;
+        hdr->sadb_msg_reserved = 0;
+        hdr->sadb_msg_seq = c->seq;
+        hdr->sadb_msg_pid = c->pid;
+
+        pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
+
+        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;
+        struct km_event c;
 
         xfrm_probe_algs();
         
@@ -1254,6 +1326,7 @@ static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr,
         if (IS_ERR(x))
                 return PTR_ERR(x);
 
+        xfrm_state_hold(x);
         if (hdr->sadb_msg_type == SADB_ADD)
                 err = xfrm_state_add(x);
         else
@@ -1265,27 +1338,23 @@ static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr,
                 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);
+        if (hdr->sadb_msg_type == SADB_ADD)
+                c.event = XFRM_SAP_ADDED;
+        else
+                c.event = XFRM_SAP_UPDATED;
+        c.seq = hdr->sadb_msg_seq;
+        c.pid = hdr->sadb_msg_pid;
+        km_state_notify(x, &c);
+        xfrm_state_put(x);
 
-        return 0;
+        return err;
 }
 
 static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 {
         struct xfrm_state *x;
+        struct km_event c;
+        int err;
 
         if (!ext_hdrs[SADB_EXT_SA-1] ||
             !present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
@@ -1301,13 +1370,19 @@ static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
                 return -EPERM;
         }
         
-        xfrm_state_delete(x);
-        xfrm_state_put(x);
+        err = xfrm_state_delete(x);
+        if (err < 0) {
+                xfrm_state_put(x);
+                return err;
+        }
 
-        pfkey_broadcast(skb_clone(skb, GFP_KERNEL), GFP_KERNEL, 
-                        BROADCAST_ALL, sk);
+        c.seq = hdr->sadb_msg_seq;
+        c.pid = hdr->sadb_msg_pid;
+        c.event = XFRM_SAP_DELETED;
+        km_state_notify(x, &c);
+        xfrm_state_put(x);
 
-        return 0;
+        return err;
 }
 
 static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
@@ -1445,28 +1520,42 @@ static int pfkey_register(struct sock *sk, struct sk_buff *skb, struct sadb_msg
         return 0;
 }
 
+static int key_notify_sa_flush(struct km_event *c)
+{
+        struct sk_buff *skb;
+        struct sadb_msg *hdr;
+
+        skb = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
+        if (!skb)
+                return -ENOBUFS;
+        hdr = (struct sadb_msg *) skb_put(skb, sizeof(struct sadb_msg));
+        hdr->sadb_msg_satype = pfkey_proto2satype(c->data);
+        hdr->sadb_msg_seq = c->seq;
+        hdr->sadb_msg_pid = c->pid;
+        hdr->sadb_msg_version = PF_KEY_V2;
+        hdr->sadb_msg_errno = (uint8_t) 0;
+        hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
+
+        pfkey_broadcast(skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
+
+        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;
+        struct km_event c;
 
         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);
+        c.data = proto;
+        c.seq = hdr->sadb_msg_seq;
+        c.pid = hdr->sadb_msg_pid;
+        c.event = XFRM_SAP_FLUSHED;
+        km_state_notify(NULL, &c);
 
         return 0;
 }
@@ -1859,6 +1948,35 @@ static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, i
         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
 }
 
+static int key_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
+{
+        struct sk_buff *out_skb;
+        struct sadb_msg *out_hdr;
+        int err;
+
+        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, dir);
+
+        out_hdr = (struct sadb_msg *) out_skb->data;
+        out_hdr->sadb_msg_version = PF_KEY_V2;
+
+        if (c->data && c->event == XFRM_SAP_DELETED)
+                out_hdr->sadb_msg_type = SADB_X_SPDDELETE2;
+        else
+                out_hdr->sadb_msg_type = event2poltype(c->event);
+        out_hdr->sadb_msg_errno = 0;
+        out_hdr->sadb_msg_seq = c->seq;
+        out_hdr->sadb_msg_pid = c->pid;
+        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ALL, NULL);
+out:
+        return 0;
+
+}
+
 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 {
         int err;
@@ -1866,8 +1984,7 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
         struct sadb_address *sa;
         struct sadb_x_policy *pol;
         struct xfrm_policy *xp;
-        struct sk_buff *out_skb;
-        struct sadb_msg *out_hdr;
+        struct km_event c;
 
         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
@@ -1935,31 +2052,23 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
             (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;
+                kfree(xp);
+                return err;
         }
 
-        pfkey_xfrm_policy2msg(out_skb, xp, pol->sadb_x_policy_dir-1);
+        if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
+                c.event = XFRM_SAP_UPDATED;
+        else
+                c.event = XFRM_SAP_ADDED;
 
-        xfrm_pol_put(xp);
+        c.seq = hdr->sadb_msg_seq;
+        c.pid = hdr->sadb_msg_pid;
 
-        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);
+        km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
+        xfrm_pol_put(xp);
         return 0;
 
 out:
@@ -1973,9 +2082,8 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg
         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;
+        struct km_event c;
 
         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
@@ -2010,25 +2118,40 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg
 
         err = 0;
 
+        c.seq = hdr->sadb_msg_seq;
+        c.pid = hdr->sadb_msg_pid;
+        c.event = XFRM_SAP_DELETED;
+        km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
+
+        xfrm_pol_put(xp);
+        return err;
+}
+
+static int key_pol_get_resp(struct sock *sk, struct xfrm_policy *xp, struct sadb_msg *hdr, int dir)
+{
+        int err;
+        struct sk_buff *out_skb;
+        struct sadb_msg *out_hdr;
+        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);
+        pfkey_xfrm_policy2msg(out_skb, xp, dir);
 
         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_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);
+        pfkey_broadcast(out_skb, GFP_ATOMIC, BROADCAST_ONE, sk);
         err = 0;
 
 out:
-        xfrm_pol_put(xp);
         return err;
 }
 
@@ -2037,8 +2160,7 @@ static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
         int err;
         struct sadb_x_policy *pol;
         struct xfrm_policy *xp;
-        struct sk_buff *out_skb;
-        struct sadb_msg *out_hdr;
+        struct km_event c;
 
         if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
                 return -EINVAL;
@@ -2050,24 +2172,16 @@ static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
 
         err = 0;
 
-        out_skb = pfkey_xfrm_policy2msg_prep(xp);
-        if (IS_ERR(out_skb)) {
-                err =  PTR_ERR(out_skb);
-                goto out;
+        c.seq = hdr->sadb_msg_seq;
+        c.pid = hdr->sadb_msg_pid;
+        if (hdr->sadb_msg_type == SADB_X_SPDDELETE2) {
+                c.data = 1; // to signal pfkey of SADB_X_SPDDELETE2
+                c.event = XFRM_SAP_DELETED;
+                km_policy_notify(xp, pol->sadb_x_policy_dir-1, &c);
+        } else {
+                err = key_pol_get_resp(sk, xp, hdr, pol->sadb_x_policy_dir-1);
         }
-        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;
 }
@@ -2102,22 +2216,34 @@ static int pfkey_spddump(struct sock *sk, struct sk_buff *skb, struct sadb_msg *
         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)
+static int key_notify_policy_flush(struct km_event *c)
 {
         struct sk_buff *skb_out;
-        struct sadb_msg *hdr_out;
+        struct sadb_msg *hdr;
 
-        skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_KERNEL);
+        skb_out = alloc_skb(sizeof(struct sadb_msg) + 16, GFP_ATOMIC);
         if (!skb_out)
                 return -ENOBUFS;
+        hdr = (struct sadb_msg *) skb_put(skb_out, sizeof(struct sadb_msg));
+        hdr->sadb_msg_seq = c->seq;
+        hdr->sadb_msg_pid = c->pid;
+        hdr->sadb_msg_version = PF_KEY_V2;
+        hdr->sadb_msg_errno = (uint8_t) 0;
+        hdr->sadb_msg_len = (sizeof(struct sadb_msg) / sizeof(uint64_t));
+        pfkey_broadcast(skb_out, GFP_ATOMIC, BROADCAST_ALL, NULL);
+        return 0;
 
-        xfrm_policy_flush();
+}
+
+static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
+{
+        struct km_event c;
 
-        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);
+        xfrm_policy_flush();
+        c.event = XFRM_SAP_FLUSHED;
+        c.pid = hdr->sadb_msg_pid;
+        c.seq = hdr->sadb_msg_seq;
+        km_policy_notify(NULL, 0, &c);
 
         return 0;
 }
@@ -2317,11 +2443,23 @@ static void dump_esp_combs(struct sk_buff *skb, struct xfrm_tmpl *t)
         }
 }
 
-static int pfkey_send_notify(struct xfrm_state *x, int hard)
+static int key_notify_policy_expire(struct xfrm_policy *xp, struct km_event *c)
+{
+        return 0;
+}
+
+static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
 {
         struct sk_buff *out_skb;
         struct sadb_msg *out_hdr;
-        int hsc = (hard ? 2 : 1);
+        int hard;
+        int hsc;
+
+        hard = c->data;
+        if (hard)
+                hsc = 2;
+        else
+                hsc = 1;
 
         out_skb = pfkey_xfrm_state2msg(x, 0, hsc);
         if (IS_ERR(out_skb))
@@ -2340,6 +2478,44 @@ static int pfkey_send_notify(struct xfrm_state *x, int hard)
         return 0;
 }
 
+static int pfkey_send_notify(struct xfrm_state *x, struct km_event *c)
+{
+        switch (c->event) {
+        case XFRM_SAP_EXPIRED:
+                return key_notify_sa_expire(x, c);
+        case XFRM_SAP_DELETED:
+        case XFRM_SAP_ADDED:
+        case XFRM_SAP_UPDATED:
+                return key_notify_sa(x, c);
+        case XFRM_SAP_FLUSHED:
+                return key_notify_sa_flush(c);
+        default:
+                printk("pfkey: Unknown SA event %d\n", c->event);
+                break;
+        }
+
+        return 0;
+}
+
+static int pfkey_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
+{
+        switch (c->event) {
+        case XFRM_SAP_EXPIRED:
+                return key_notify_policy_expire(xp, c);
+        case XFRM_SAP_DELETED:
+        case XFRM_SAP_ADDED:
+        case XFRM_SAP_UPDATED:
+                return key_notify_policy(xp, dir, c);
+        case XFRM_SAP_FLUSHED:
+                return key_notify_policy_flush(c);
+        default:
+                printk("pfkey: Unknown policy event %d\n", c->event);
+                break;
+        }
+
+        return 0;
+}
+
 static u32 get_acqseq(void)
 {
         u32 res;
@@ -2856,6 +3032,7 @@ static struct xfrm_mgr pfkeyv2_mgr =
         .acquire        = pfkey_send_acquire,
         .compile_policy = pfkey_compile_policy,
         .new_mapping    = pfkey_send_new_mapping,
+        .notify_policy  = pfkey_send_policy_notify,
 };
 
 static void __exit ipsec_pfkey_exit(void)