[XFRM]: Support to increment packet dropping statistics.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 51 insertions, 12 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 32ddb7b12e7f..74807a7d3d69 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1494,8 +1494,10 @@ restart:
         if (sk && sk->sk_policy[XFRM_POLICY_OUT]) {
                 policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
                 err = PTR_ERR(policy);
-                if (IS_ERR(policy))
+                if (IS_ERR(policy)) {
+                        XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
                         goto dropdst;
+                }
         }
 
         if (!policy) {
@@ -1529,6 +1531,7 @@ restart:
         default:
         case XFRM_POLICY_BLOCK:
                 /* Prohibit the flow */
+                XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
                 err = -EPERM;
                 goto error;
 
@@ -1548,6 +1551,7 @@ restart:
                  */
                 dst = xfrm_find_bundle(fl, policy, family);
                 if (IS_ERR(dst)) {
+                        XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
                         err = PTR_ERR(dst);
                         goto error;
                 }
@@ -1562,10 +1566,12 @@ restart:
                                                             XFRM_POLICY_OUT);
                         if (pols[1]) {
                                 if (IS_ERR(pols[1])) {
+                                        XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLERROR);
                                         err = PTR_ERR(pols[1]);
                                         goto error;
                                 }
                                 if (pols[1]->action == XFRM_POLICY_BLOCK) {
+                                        XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLBLOCK);
                                         err = -EPERM;
                                         goto error;
                                 }
@@ -1611,6 +1617,7 @@ restart:
                                 nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);
 
                                 if (nx == -EAGAIN && signal_pending(current)) {
+                                        XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
                                         err = -ERESTART;
                                         goto error;
                                 }
@@ -1621,8 +1628,10 @@ restart:
                                 }
                                 err = nx;
                         }
-                        if (err < 0)
+                        if (err < 0) {
+                                XFRM_INC_STATS(LINUX_MIB_XFRMOUTNOSTATES);
                                 goto error;
+                        }
                 }
                 if (nx == 0) {
                         /* Flow passes not transformed. */
@@ -1632,8 +1641,10 @@ restart:
 
                 dst = xfrm_bundle_create(policy, xfrm, nx, fl, dst_orig);
                 err = PTR_ERR(dst);
-                if (IS_ERR(dst))
+                if (IS_ERR(dst)) {
+                        XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLEGENERROR);
                         goto error;
+                }
 
                 for (pi = 0; pi < npols; pi++) {
                         read_lock_bh(&pols[pi]->lock);
@@ -1652,6 +1663,10 @@ restart:
                         if (dst)
                                 dst_free(dst);
 
+                        if (pol_dead)
+                                XFRM_INC_STATS(LINUX_MIB_XFRMOUTPOLDEAD);
+                        else
+                                XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
                         err = -EHOSTUNREACH;
                         goto error;
                 }
@@ -1664,6 +1679,7 @@ restart:
                         write_unlock_bh(&policy->lock);
                         if (dst)
                                 dst_free(dst);
+                        XFRM_INC_STATS(LINUX_MIB_XFRMOUTBUNDLECHECKERROR);
                         goto error;
                 }
 
@@ -1817,8 +1833,11 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
         dir &= XFRM_POLICY_MASK;
         fl_dir = policy_to_flow_dir(dir);
 
-        if (__xfrm_decode_session(skb, &fl, family, reverse) < 0)
+        if (__xfrm_decode_session(skb, &fl, family, reverse) < 0) {
+                XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
                 return 0;
+        }
+
         nf_nat_decode_session(skb, &fl, family);
 
         /* First, check used SA against their selectors. */
@@ -1827,28 +1846,35 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
 
                 for (i=skb->sp->len-1; i>=0; i--) {
                         struct xfrm_state *x = skb->sp->xvec[i];
-                        if (!xfrm_selector_match(&x->sel, &fl, family))
+                        if (!xfrm_selector_match(&x->sel, &fl, family)) {
+                                XFRM_INC_STATS(LINUX_MIB_XFRMINSTATEMISMATCH);
                                 return 0;
+                        }
                 }
         }
 
         pol = NULL;
         if (sk && sk->sk_policy[dir]) {
                 pol = xfrm_sk_policy_lookup(sk, dir, &fl);
-                if (IS_ERR(pol))
+                if (IS_ERR(pol)) {
+                        XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
                         return 0;
+                }
         }
 
         if (!pol)
                 pol = flow_cache_lookup(&fl, family, fl_dir,
                                         xfrm_policy_lookup);
 
-        if (IS_ERR(pol))
+        if (IS_ERR(pol)) {
+                XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
                 return 0;
+        }
 
         if (!pol) {
                 if (skb->sp && secpath_has_nontransport(skb->sp, 0, &xerr_idx)) {
                         xfrm_secpath_reject(xerr_idx, skb, &fl);
+                        XFRM_INC_STATS(LINUX_MIB_XFRMINNOPOLS);
                         return 0;
                 }
                 return 1;
@@ -1864,8 +1890,10 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
                                                     &fl, family,
                                                     XFRM_POLICY_IN);
                 if (pols[1]) {
-                        if (IS_ERR(pols[1]))
+                        if (IS_ERR(pols[1])) {
+                                XFRM_INC_STATS(LINUX_MIB_XFRMINPOLERROR);
                                 return 0;
+                        }
                         pols[1]->curlft.use_time = get_seconds();
                         npols ++;
                 }
@@ -1886,10 +1914,14 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
 
                 for (pi = 0; pi < npols; pi++) {
                         if (pols[pi] != pol &&
-                            pols[pi]->action != XFRM_POLICY_ALLOW)
+                            pols[pi]->action != XFRM_POLICY_ALLOW) {
+                                XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
                                 goto reject;
-                        if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH)
+                        }
+                        if (ti + pols[pi]->xfrm_nr >= XFRM_MAX_DEPTH) {
+                                XFRM_INC_STATS(LINUX_MIB_XFRMINBUFFERERROR);
                                 goto reject_error;
+                        }
                         for (i = 0; i < pols[pi]->xfrm_nr; i++)
                                 tpp[ti++] = &pols[pi]->xfrm_vec[i];
                 }
@@ -1911,16 +1943,20 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
                                 if (k < -1)
                                         /* "-2 - errored_index" returned */
                                         xerr_idx = -(2+k);
+                                XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
                                 goto reject;
                         }
                 }
 
-                if (secpath_has_nontransport(sp, k, &xerr_idx))
+                if (secpath_has_nontransport(sp, k, &xerr_idx)) {
+                        XFRM_INC_STATS(LINUX_MIB_XFRMINTMPLMISMATCH);
                         goto reject;
+                }
 
                 xfrm_pols_put(pols, npols);
                 return 1;
         }
+        XFRM_INC_STATS(LINUX_MIB_XFRMINPOLBLOCK);
 
 reject:
         xfrm_secpath_reject(xerr_idx, skb, &fl);
@@ -1934,8 +1970,11 @@ int __xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 {
         struct flowi fl;
 
-        if (xfrm_decode_session(skb, &fl, family) < 0)
+        if (xfrm_decode_session(skb, &fl, family) < 0) {
+                /* XXX: we should have something like FWDHDRERROR here. */
+                XFRM_INC_STATS(LINUX_MIB_XFRMINHDRERROR);
                 return 0;
+        }
 
         return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
 }