X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fipv4%2Fipcomp.c;h=6845207f2eddb64383c74957f997ed9a59c69b99;hb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;hp=7ce7469a3c04fb2f4eefe266fccd1b70abd0ac94;hpb=a2c21200f1c81b08cb55e417b68150bba439b646;p=linux-2.6.git diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c index 7ce7469a3..6845207f2 100644 --- a/net/ipv4/ipcomp.c +++ b/net/ipv4/ipcomp.c @@ -16,25 +16,48 @@ #include #include #include +#include #include #include +#include +#include +#include +#include +#include #include #include #include #include +struct ipcomp_tfms { + struct list_head list; + struct crypto_tfm **tfms; + int users; +}; + +static DECLARE_MUTEX(ipcomp_resource_sem); +static void **ipcomp_scratches; +static int ipcomp_scratch_users; +static LIST_HEAD(ipcomp_tfms_list); + static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb) { int err, plen, dlen; struct iphdr *iph; struct ipcomp_data *ipcd = x->data; - u8 *start, *scratch = ipcd->scratch; + u8 *start, *scratch; + struct crypto_tfm *tfm; + int cpu; plen = skb->len; dlen = IPCOMP_SCRATCH_SIZE; start = skb->data; - err = crypto_comp_decompress(ipcd->tfm, start, plen, scratch, &dlen); + cpu = get_cpu(); + scratch = *per_cpu_ptr(ipcomp_scratches, cpu); + tfm = *per_cpu_ptr(ipcd->tfms, cpu); + + err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen); if (err) goto out; @@ -52,6 +75,7 @@ static int ipcomp_decompress(struct xfrm_state *x, struct sk_buff *skb) iph = skb->nh.iph; iph->tot_len = htons(dlen + iph->ihl * 4); out: + put_cpu(); return err; } @@ -97,14 +121,20 @@ static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb) int err, plen, dlen, ihlen; struct iphdr *iph = skb->nh.iph; struct ipcomp_data *ipcd = x->data; - u8 *start, *scratch = ipcd->scratch; + u8 *start, *scratch; + struct crypto_tfm *tfm; + int cpu; ihlen = iph->ihl * 4; plen = skb->len - ihlen; dlen = IPCOMP_SCRATCH_SIZE; start = skb->data + ihlen; - err = crypto_comp_compress(ipcd->tfm, start, plen, scratch, &dlen); + cpu = get_cpu(); + scratch = *per_cpu_ptr(ipcomp_scratches, cpu); + tfm = *per_cpu_ptr(ipcd->tfms, cpu); + + err = crypto_comp_compress(tfm, start, plen, scratch, &dlen); if (err) goto out; @@ -114,26 +144,30 @@ static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb) } memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen); + put_cpu(); + pskb_trim(skb, ihlen + dlen + sizeof(struct ip_comp_hdr)); + return 0; out: + put_cpu(); return err; } -static int ipcomp_output(struct sk_buff **pskb) +static int ipcomp_output(struct sk_buff *skb) { int err; - struct dst_entry *dst = (*pskb)->dst; + struct dst_entry *dst = skb->dst; struct xfrm_state *x = dst->xfrm; struct iphdr *iph; struct ip_comp_hdr *ipch; struct ipcomp_data *ipcd = x->data; int hdr_len = 0; - iph = (*pskb)->nh.iph; - iph->tot_len = htons((*pskb)->len); + iph = skb->nh.iph; + iph->tot_len = htons(skb->len); hdr_len = iph->ihl * 4; - if (((*pskb)->len - hdr_len) < ipcd->threshold) { + if ((skb->len - hdr_len) < ipcd->threshold) { /* Don't bother compressing */ if (x->props.mode) { ip_send_check(iph); @@ -141,17 +175,17 @@ static int ipcomp_output(struct sk_buff **pskb) goto out_ok; } - if ((skb_is_nonlinear(*pskb) || skb_cloned(*pskb)) && - skb_linearize(*pskb, GFP_ATOMIC) != 0) { + if ((skb_is_nonlinear(skb) || skb_cloned(skb)) && + skb_linearize(skb, GFP_ATOMIC) != 0) { err = -ENOMEM; goto error; } - err = ipcomp_compress(x, *pskb); + err = ipcomp_compress(x, skb); if (err) { if (err == -EMSGSIZE) { if (x->props.mode) { - iph = (*pskb)->nh.iph; + iph = skb->nh.iph; ip_send_check(iph); } goto out_ok; @@ -160,8 +194,8 @@ static int ipcomp_output(struct sk_buff **pskb) } /* Install ipcomp header, convert into ipcomp datagram. */ - iph = (*pskb)->nh.iph; - iph->tot_len = htons((*pskb)->len); + iph = skb->nh.iph; + iph->tot_len = htons(skb->len); ipch = (struct ip_comp_hdr *)((char *)iph + iph->ihl * 4); ipch->nexthdr = iph->protocol; ipch->flags = 0; @@ -260,12 +294,132 @@ out: return err; } +static void ipcomp_free_scratches(void) +{ + int i; + void **scratches; + + if (--ipcomp_scratch_users) + return; + + scratches = ipcomp_scratches; + if (!scratches) + return; + + for_each_cpu(i) { + void *scratch = *per_cpu_ptr(scratches, i); + if (scratch) + vfree(scratch); + } + + free_percpu(scratches); +} + +static void **ipcomp_alloc_scratches(void) +{ + int i; + void **scratches; + + if (ipcomp_scratch_users++) + return ipcomp_scratches; + + scratches = alloc_percpu(void *); + if (!scratches) + return NULL; + + ipcomp_scratches = scratches; + + for_each_cpu(i) { + void *scratch = vmalloc(IPCOMP_SCRATCH_SIZE); + if (!scratch) + return NULL; + *per_cpu_ptr(scratches, i) = scratch; + } + + return scratches; +} + +static void ipcomp_free_tfms(struct crypto_tfm **tfms) +{ + struct ipcomp_tfms *pos; + int cpu; + + list_for_each_entry(pos, &ipcomp_tfms_list, list) { + if (pos->tfms == tfms) + break; + } + + BUG_TRAP(pos); + + if (--pos->users) + return; + + list_del(&pos->list); + kfree(pos); + + if (!tfms) + return; + + for_each_cpu(cpu) { + struct crypto_tfm *tfm = *per_cpu_ptr(tfms, cpu); + if (tfm) + crypto_free_tfm(tfm); + } + free_percpu(tfms); +} + +static struct crypto_tfm **ipcomp_alloc_tfms(const char *alg_name) +{ + struct ipcomp_tfms *pos; + struct crypto_tfm **tfms; + int cpu; + + /* This can be any valid CPU ID so we don't need locking. */ + cpu = smp_processor_id(); + + list_for_each_entry(pos, &ipcomp_tfms_list, list) { + struct crypto_tfm *tfm; + + tfms = pos->tfms; + tfm = *per_cpu_ptr(tfms, cpu); + + if (!strcmp(crypto_tfm_alg_name(tfm), alg_name)) { + pos->users++; + return tfms; + } + } + + pos = kmalloc(sizeof(*pos), GFP_KERNEL); + if (!pos) + return NULL; + + pos->users = 1; + INIT_LIST_HEAD(&pos->list); + list_add(&pos->list, &ipcomp_tfms_list); + + pos->tfms = tfms = alloc_percpu(struct crypto_tfm *); + if (!tfms) + goto error; + + for_each_cpu(cpu) { + struct crypto_tfm *tfm = crypto_alloc_tfm(alg_name, 0); + if (!tfm) + goto error; + *per_cpu_ptr(tfms, cpu) = tfm; + } + + return tfms; + +error: + ipcomp_free_tfms(tfms); + return NULL; +} + static void ipcomp_free_data(struct ipcomp_data *ipcd) { - if (ipcd->tfm) - crypto_free_tfm(ipcd->tfm); - if (ipcd->scratch) - kfree(ipcd->scratch); + if (ipcd->tfms) + ipcomp_free_tfms(ipcd->tfms); + ipcomp_free_scratches(); } static void ipcomp_destroy(struct xfrm_state *x) @@ -274,7 +428,9 @@ static void ipcomp_destroy(struct xfrm_state *x) if (!ipcd) return; xfrm_state_delete_tunnel(x); + down(&ipcomp_resource_sem); ipcomp_free_data(ipcd); + up(&ipcomp_resource_sem); kfree(ipcd); } @@ -288,28 +444,32 @@ static int ipcomp_init_state(struct xfrm_state *x, void *args) if (!x->calg) goto out; + if (x->encap) + goto out; + err = -ENOMEM; ipcd = kmalloc(sizeof(*ipcd), GFP_KERNEL); if (!ipcd) - goto error; + goto out; memset(ipcd, 0, sizeof(*ipcd)); x->props.header_len = 0; if (x->props.mode) x->props.header_len += sizeof(struct iphdr); - ipcd->scratch = kmalloc(IPCOMP_SCRATCH_SIZE, GFP_KERNEL); - if (!ipcd->scratch) + down(&ipcomp_resource_sem); + if (!ipcomp_alloc_scratches()) goto error; - - ipcd->tfm = crypto_alloc_tfm(x->calg->alg_name, 0); - if (!ipcd->tfm) + + ipcd->tfms = ipcomp_alloc_tfms(x->calg->alg_name); + if (!ipcd->tfms) goto error; + up(&ipcomp_resource_sem); if (x->props.mode) { err = ipcomp_tunnel_attach(x); if (err) - goto error; + goto error_tunnel; } calg_desc = xfrm_calg_get_byname(x->calg->alg_name); @@ -320,11 +480,12 @@ static int ipcomp_init_state(struct xfrm_state *x, void *args) out: return err; +error_tunnel: + down(&ipcomp_resource_sem); error: - if (ipcd) { - ipcomp_free_data(ipcd); - kfree(ipcd); - } + ipcomp_free_data(ipcd); + up(&ipcomp_resource_sem); + kfree(ipcd); goto out; }