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-rw-r--r--net/ipv6/netfilter/nf_conntrack_reasm.c167
-rw-r--r--net/ipv6/netfilter/nf_defrag_ipv6_hooks.c20
-rw-r--r--net/ipv6/netfilter/nf_reject_ipv6.c1
3 files changed, 74 insertions, 114 deletions
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index bab4441ed4e4..e4347aeb2e65 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -56,7 +56,6 @@ struct nf_ct_frag6_skb_cb
{
struct inet6_skb_parm h;
int offset;
- struct sk_buff *orig;
};
#define NFCT_FRAG6_CB(skb) ((struct nf_ct_frag6_skb_cb *)((skb)->cb))
@@ -170,12 +169,6 @@ static unsigned int nf_hashfn(const struct inet_frag_queue *q)
return nf_hash_frag(nq->id, &nq->saddr, &nq->daddr);
}
-static void nf_skb_free(struct sk_buff *skb)
-{
- if (NFCT_FRAG6_CB(skb)->orig)
- kfree_skb(NFCT_FRAG6_CB(skb)->orig);
-}
-
static void nf_ct_frag6_expire(unsigned long data)
{
struct frag_queue *fq;
@@ -369,17 +362,18 @@ err:
/*
* Check if this packet is complete.
- * Returns NULL on failure by any reason, and pointer
- * to current nexthdr field in reassembled frame.
*
* It is called with locked fq, and caller must check that
* queue is eligible for reassembly i.e. it is not COMPLETE,
* the last and the first frames arrived and all the bits are here.
+ *
+ * returns true if *prev skb has been transformed into the reassembled
+ * skb, false otherwise.
*/
-static struct sk_buff *
-nf_ct_frag6_reasm(struct frag_queue *fq, struct net_device *dev)
+static bool
+nf_ct_frag6_reasm(struct frag_queue *fq, struct sk_buff *prev, struct net_device *dev)
{
- struct sk_buff *fp, *op, *head = fq->q.fragments;
+ struct sk_buff *fp, *head = fq->q.fragments;
int payload_len;
u8 ecn;
@@ -390,22 +384,21 @@ nf_ct_frag6_reasm(struct frag_queue *fq, struct net_device *dev)
ecn = ip_frag_ecn_table[fq->ecn];
if (unlikely(ecn == 0xff))
- goto out_fail;
+ return false;
/* Unfragmented part is taken from the first segment. */
payload_len = ((head->data - skb_network_header(head)) -
sizeof(struct ipv6hdr) + fq->q.len -
sizeof(struct frag_hdr));
if (payload_len > IPV6_MAXPLEN) {
- pr_debug("payload len is too large.\n");
- goto out_oversize;
+ net_dbg_ratelimited("nf_ct_frag6_reasm: payload len = %d\n",
+ payload_len);
+ return false;
}
/* Head of list must not be cloned. */
- if (skb_unclone(head, GFP_ATOMIC)) {
- pr_debug("skb is cloned but can't expand head");
- goto out_oom;
- }
+ if (skb_unclone(head, GFP_ATOMIC))
+ return false;
/* If the first fragment is fragmented itself, we split
* it to two chunks: the first with data and paged part
@@ -416,7 +409,7 @@ nf_ct_frag6_reasm(struct frag_queue *fq, struct net_device *dev)
clone = alloc_skb(0, GFP_ATOMIC);
if (clone == NULL)
- goto out_oom;
+ return false;
clone->next = head->next;
head->next = clone;
@@ -430,10 +423,41 @@ nf_ct_frag6_reasm(struct frag_queue *fq, struct net_device *dev)
clone->csum = 0;
clone->ip_summed = head->ip_summed;
- NFCT_FRAG6_CB(clone)->orig = NULL;
add_frag_mem_limit(fq->q.net, clone->truesize);
}
+ /* morph head into last received skb: prev.
+ *
+ * This allows callers of ipv6 conntrack defrag to continue
+ * to use the last skb(frag) passed into the reasm engine.
+ * The last skb frag 'silently' turns into the full reassembled skb.
+ *
+ * Since prev is also part of q->fragments we have to clone it first.
+ */
+ if (head != prev) {
+ struct sk_buff *iter;
+
+ fp = skb_clone(prev, GFP_ATOMIC);
+ if (!fp)
+ return false;
+
+ fp->next = prev->next;
+
+ iter = head;
+ while (iter) {
+ if (iter->next == prev) {
+ iter->next = fp;
+ break;
+ }
+ iter = iter->next;
+ }
+
+ skb_morph(prev, head);
+ prev->next = head->next;
+ consume_skb(head);
+ head = prev;
+ }
+
/* We have to remove fragment header from datagram and to relocate
* header in order to calculate ICV correctly. */
skb_network_header(head)[fq->nhoffset] = skb_transport_header(head)[0];
@@ -474,31 +498,7 @@ nf_ct_frag6_reasm(struct frag_queue *fq, struct net_device *dev)
fq->q.fragments = NULL;
fq->q.fragments_tail = NULL;
- /* all original skbs are linked into the NFCT_FRAG6_CB(head).orig */
- fp = skb_shinfo(head)->frag_list;
- if (fp && NFCT_FRAG6_CB(fp)->orig == NULL)
- /* at above code, head skb is divided into two skbs. */
- fp = fp->next;
-
- op = NFCT_FRAG6_CB(head)->orig;
- for (; fp; fp = fp->next) {
- struct sk_buff *orig = NFCT_FRAG6_CB(fp)->orig;
-
- op->next = orig;
- op = orig;
- NFCT_FRAG6_CB(fp)->orig = NULL;
- }
-
- return head;
-
-out_oversize:
- net_dbg_ratelimited("nf_ct_frag6_reasm: payload len = %d\n",
- payload_len);
- goto out_fail;
-out_oom:
- net_dbg_ratelimited("nf_ct_frag6_reasm: no memory for reassembly\n");
-out_fail:
- return NULL;
+ return true;
}
/*
@@ -564,89 +564,61 @@ find_prev_fhdr(struct sk_buff *skb, u8 *prevhdrp, int *prevhoff, int *fhoff)
return 0;
}
-struct sk_buff *nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user)
+int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user)
{
- struct sk_buff *clone;
struct net_device *dev = skb->dev;
+ int fhoff, nhoff, ret;
struct frag_hdr *fhdr;
struct frag_queue *fq;
struct ipv6hdr *hdr;
- int fhoff, nhoff;
u8 prevhdr;
- struct sk_buff *ret_skb = NULL;
/* Jumbo payload inhibits frag. header */
if (ipv6_hdr(skb)->payload_len == 0) {
pr_debug("payload len = 0\n");
- return skb;
+ return -EINVAL;
}
if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0)
- return skb;
+ return -EINVAL;
- clone = skb_clone(skb, GFP_ATOMIC);
- if (clone == NULL) {
- pr_debug("Can't clone skb\n");
- return skb;
- }
+ if (!pskb_may_pull(skb, fhoff + sizeof(*fhdr)))
+ return -ENOMEM;
- NFCT_FRAG6_CB(clone)->orig = skb;
-
- if (!pskb_may_pull(clone, fhoff + sizeof(*fhdr))) {
- pr_debug("message is too short.\n");
- goto ret_orig;
- }
-
- skb_set_transport_header(clone, fhoff);
- hdr = ipv6_hdr(clone);
- fhdr = (struct frag_hdr *)skb_transport_header(clone);
+ skb_set_transport_header(skb, fhoff);
+ hdr = ipv6_hdr(skb);
+ fhdr = (struct frag_hdr *)skb_transport_header(skb);
fq = fq_find(net, fhdr->identification, user, &hdr->saddr, &hdr->daddr,
skb->dev ? skb->dev->ifindex : 0, ip6_frag_ecn(hdr));
if (fq == NULL) {
pr_debug("Can't find and can't create new queue\n");
- goto ret_orig;
+ return -ENOMEM;
}
spin_lock_bh(&fq->q.lock);
- if (nf_ct_frag6_queue(fq, clone, fhdr, nhoff) < 0) {
- spin_unlock_bh(&fq->q.lock);
- pr_debug("Can't insert skb to queue\n");
- inet_frag_put(&fq->q, &nf_frags);
- goto ret_orig;
+ if (nf_ct_frag6_queue(fq, skb, fhdr, nhoff) < 0) {
+ ret = -EINVAL;
+ goto out_unlock;
}
+ /* after queue has assumed skb ownership, only 0 or -EINPROGRESS
+ * must be returned.
+ */
+ ret = -EINPROGRESS;
if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
- fq->q.meat == fq->q.len) {
- ret_skb = nf_ct_frag6_reasm(fq, dev);
- if (ret_skb == NULL)
- pr_debug("Can't reassemble fragmented packets\n");
- }
- spin_unlock_bh(&fq->q.lock);
+ fq->q.meat == fq->q.len &&
+ nf_ct_frag6_reasm(fq, skb, dev))
+ ret = 0;
+out_unlock:
+ spin_unlock_bh(&fq->q.lock);
inet_frag_put(&fq->q, &nf_frags);
- return ret_skb;
-
-ret_orig:
- kfree_skb(clone);
- return skb;
+ return ret;
}
EXPORT_SYMBOL_GPL(nf_ct_frag6_gather);
-void nf_ct_frag6_consume_orig(struct sk_buff *skb)
-{
- struct sk_buff *s, *s2;
-
- for (s = NFCT_FRAG6_CB(skb)->orig; s;) {
- s2 = s->next;
- s->next = NULL;
- consume_skb(s);
- s = s2;
- }
-}
-EXPORT_SYMBOL_GPL(nf_ct_frag6_consume_orig);
-
static int nf_ct_net_init(struct net *net)
{
int res;
@@ -681,7 +653,6 @@ int nf_ct_frag6_init(void)
nf_frags.hashfn = nf_hashfn;
nf_frags.constructor = ip6_frag_init;
nf_frags.destructor = NULL;
- nf_frags.skb_free = nf_skb_free;
nf_frags.qsize = sizeof(struct frag_queue);
nf_frags.match = ip6_frag_match;
nf_frags.frag_expire = nf_ct_frag6_expire;
diff --git a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
index 4fdbed5ebfb6..f7aab5ab93a5 100644
--- a/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
+++ b/net/ipv6/netfilter/nf_defrag_ipv6_hooks.c
@@ -55,7 +55,7 @@ static unsigned int ipv6_defrag(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
- struct sk_buff *reasm;
+ int err;
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
/* Previously seen (loopback)? */
@@ -63,23 +63,13 @@ static unsigned int ipv6_defrag(void *priv,
return NF_ACCEPT;
#endif
- reasm = nf_ct_frag6_gather(state->net, skb,
- nf_ct6_defrag_user(state->hook, skb));
+ err = nf_ct_frag6_gather(state->net, skb,
+ nf_ct6_defrag_user(state->hook, skb));
/* queued */
- if (reasm == NULL)
+ if (err == -EINPROGRESS)
return NF_STOLEN;
- /* error occurred or not fragmented */
- if (reasm == skb)
- return NF_ACCEPT;
-
- nf_ct_frag6_consume_orig(reasm);
-
- NF_HOOK_THRESH(NFPROTO_IPV6, state->hook, state->net, state->sk, reasm,
- state->in, state->out,
- state->okfn, NF_IP6_PRI_CONNTRACK_DEFRAG + 1);
-
- return NF_STOLEN;
+ return NF_ACCEPT;
}
static struct nf_hook_ops ipv6_defrag_ops[] = {
diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c
index e0f922b777e3..4709f657b7b6 100644
--- a/net/ipv6/netfilter/nf_reject_ipv6.c
+++ b/net/ipv6/netfilter/nf_reject_ipv6.c
@@ -14,7 +14,6 @@
#include <net/netfilter/ipv6/nf_reject.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter_bridge.h>
-#include <net/netfilter/ipv6/nf_reject.h>
const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
struct tcphdr *otcph,
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 16:51:17 +0100