| /* |
| * IPv6 fragment reassembly |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * Based on: net/ipv4/ip_fragment.c |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| /* |
| * Fixes: |
| * Andi Kleen Make it work with multiple hosts. |
| * More RFC compliance. |
| * |
| * Horst von Brand Add missing #include <linux/string.h> |
| * Alexey Kuznetsov SMP races, threading, cleanup. |
| * Patrick McHardy LRU queue of frag heads for evictor. |
| * Mitsuru KANDA @USAGI Register inet6_protocol{}. |
| * David Stevens and |
| * YOSHIFUJI,H. @USAGI Always remove fragment header to |
| * calculate ICV correctly. |
| */ |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/jiffies.h> |
| #include <linux/net.h> |
| #include <linux/list.h> |
| #include <linux/netdevice.h> |
| #include <linux/in6.h> |
| #include <linux/ipv6.h> |
| #include <linux/icmpv6.h> |
| #include <linux/random.h> |
| #include <linux/jhash.h> |
| #include <linux/skbuff.h> |
| |
| #include <net/sock.h> |
| #include <net/snmp.h> |
| |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <net/protocol.h> |
| #include <net/transp_v6.h> |
| #include <net/rawv6.h> |
| #include <net/ndisc.h> |
| #include <net/addrconf.h> |
| #include <net/inet_frag.h> |
| |
| struct ip6frag_skb_cb |
| { |
| struct inet6_skb_parm h; |
| int offset; |
| }; |
| |
| #define FRAG6_CB(skb) ((struct ip6frag_skb_cb*)((skb)->cb)) |
| |
| |
| /* |
| * Equivalent of ipv4 struct ipq |
| */ |
| |
| struct frag_queue |
| { |
| struct inet_frag_queue q; |
| |
| __be32 id; /* fragment id */ |
| u32 user; |
| struct in6_addr saddr; |
| struct in6_addr daddr; |
| |
| int iif; |
| unsigned int csum; |
| __u16 nhoffset; |
| }; |
| |
| static struct inet_frags ip6_frags; |
| |
| int ip6_frag_nqueues(struct net *net) |
| { |
| return net->ipv6.frags.nqueues; |
| } |
| |
| int ip6_frag_mem(struct net *net) |
| { |
| return atomic_read(&net->ipv6.frags.mem); |
| } |
| |
| static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
| struct net_device *dev); |
| |
| /* |
| * callers should be careful not to use the hash value outside the ipfrag_lock |
| * as doing so could race with ipfrag_hash_rnd being recalculated. |
| */ |
| unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, |
| const struct in6_addr *daddr, u32 rnd) |
| { |
| u32 a, b, c; |
| |
| a = (__force u32)saddr->s6_addr32[0]; |
| b = (__force u32)saddr->s6_addr32[1]; |
| c = (__force u32)saddr->s6_addr32[2]; |
| |
| a += JHASH_GOLDEN_RATIO; |
| b += JHASH_GOLDEN_RATIO; |
| c += rnd; |
| __jhash_mix(a, b, c); |
| |
| a += (__force u32)saddr->s6_addr32[3]; |
| b += (__force u32)daddr->s6_addr32[0]; |
| c += (__force u32)daddr->s6_addr32[1]; |
| __jhash_mix(a, b, c); |
| |
| a += (__force u32)daddr->s6_addr32[2]; |
| b += (__force u32)daddr->s6_addr32[3]; |
| c += (__force u32)id; |
| __jhash_mix(a, b, c); |
| |
| return c & (INETFRAGS_HASHSZ - 1); |
| } |
| EXPORT_SYMBOL_GPL(inet6_hash_frag); |
| |
| static unsigned int ip6_hashfn(struct inet_frag_queue *q) |
| { |
| struct frag_queue *fq; |
| |
| fq = container_of(q, struct frag_queue, q); |
| return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd); |
| } |
| |
| int ip6_frag_match(struct inet_frag_queue *q, void *a) |
| { |
| struct frag_queue *fq; |
| struct ip6_create_arg *arg = a; |
| |
| fq = container_of(q, struct frag_queue, q); |
| return (fq->id == arg->id && fq->user == arg->user && |
| ipv6_addr_equal(&fq->saddr, arg->src) && |
| ipv6_addr_equal(&fq->daddr, arg->dst)); |
| } |
| EXPORT_SYMBOL(ip6_frag_match); |
| |
| /* Memory Tracking Functions. */ |
| static inline void frag_kfree_skb(struct netns_frags *nf, |
| struct sk_buff *skb, int *work) |
| { |
| if (work) |
| *work -= skb->truesize; |
| atomic_sub(skb->truesize, &nf->mem); |
| kfree_skb(skb); |
| } |
| |
| void ip6_frag_init(struct inet_frag_queue *q, void *a) |
| { |
| struct frag_queue *fq = container_of(q, struct frag_queue, q); |
| struct ip6_create_arg *arg = a; |
| |
| fq->id = arg->id; |
| fq->user = arg->user; |
| ipv6_addr_copy(&fq->saddr, arg->src); |
| ipv6_addr_copy(&fq->daddr, arg->dst); |
| } |
| EXPORT_SYMBOL(ip6_frag_init); |
| |
| /* Destruction primitives. */ |
| |
| static __inline__ void fq_put(struct frag_queue *fq) |
| { |
| inet_frag_put(&fq->q, &ip6_frags); |
| } |
| |
| /* Kill fq entry. It is not destroyed immediately, |
| * because caller (and someone more) holds reference count. |
| */ |
| static __inline__ void fq_kill(struct frag_queue *fq) |
| { |
| inet_frag_kill(&fq->q, &ip6_frags); |
| } |
| |
| static void ip6_evictor(struct net *net, struct inet6_dev *idev) |
| { |
| int evicted; |
| |
| evicted = inet_frag_evictor(&net->ipv6.frags, &ip6_frags); |
| if (evicted) |
| IP6_ADD_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS, evicted); |
| } |
| |
| static void ip6_frag_expire(unsigned long data) |
| { |
| struct frag_queue *fq; |
| struct net_device *dev = NULL; |
| struct net *net; |
| |
| fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q); |
| |
| spin_lock(&fq->q.lock); |
| |
| if (fq->q.last_in & INET_FRAG_COMPLETE) |
| goto out; |
| |
| fq_kill(fq); |
| |
| net = container_of(fq->q.net, struct net, ipv6.frags); |
| rcu_read_lock(); |
| dev = dev_get_by_index_rcu(net, fq->iif); |
| if (!dev) |
| goto out_rcu_unlock; |
| |
| IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT); |
| IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
| |
| /* Don't send error if the first segment did not arrive. */ |
| if (!(fq->q.last_in & INET_FRAG_FIRST_IN) || !fq->q.fragments) |
| goto out_rcu_unlock; |
| |
| /* |
| But use as source device on which LAST ARRIVED |
| segment was received. And do not use fq->dev |
| pointer directly, device might already disappeared. |
| */ |
| fq->q.fragments->dev = dev; |
| icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0, dev); |
| out_rcu_unlock: |
| rcu_read_unlock(); |
| out: |
| spin_unlock(&fq->q.lock); |
| fq_put(fq); |
| } |
| |
| static __inline__ struct frag_queue * |
| fq_find(struct net *net, __be32 id, struct in6_addr *src, struct in6_addr *dst, |
| struct inet6_dev *idev) |
| { |
| struct inet_frag_queue *q; |
| struct ip6_create_arg arg; |
| unsigned int hash; |
| |
| arg.id = id; |
| arg.user = IP6_DEFRAG_LOCAL_DELIVER; |
| arg.src = src; |
| arg.dst = dst; |
| |
| read_lock(&ip6_frags.lock); |
| hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd); |
| |
| q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash); |
| if (q == NULL) |
| goto oom; |
| |
| return container_of(q, struct frag_queue, q); |
| |
| oom: |
| IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_REASMFAILS); |
| return NULL; |
| } |
| |
| static int ip6_frag_queue(struct frag_queue *fq, struct sk_buff *skb, |
| struct frag_hdr *fhdr, int nhoff) |
| { |
| struct sk_buff *prev, *next; |
| struct net_device *dev; |
| int offset, end; |
| struct net *net = dev_net(skb_dst(skb)->dev); |
| |
| if (fq->q.last_in & INET_FRAG_COMPLETE) |
| goto err; |
| |
| offset = ntohs(fhdr->frag_off) & ~0x7; |
| end = offset + (ntohs(ipv6_hdr(skb)->payload_len) - |
| ((u8 *)(fhdr + 1) - (u8 *)(ipv6_hdr(skb) + 1))); |
| |
| if ((unsigned int)end > IPV6_MAXPLEN) { |
| IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
| IPSTATS_MIB_INHDRERRORS); |
| icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| ((u8 *)&fhdr->frag_off - |
| skb_network_header(skb))); |
| return -1; |
| } |
| |
| if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| const unsigned char *nh = skb_network_header(skb); |
| skb->csum = csum_sub(skb->csum, |
| csum_partial(nh, (u8 *)(fhdr + 1) - nh, |
| 0)); |
| } |
| |
| /* Is this the final fragment? */ |
| if (!(fhdr->frag_off & htons(IP6_MF))) { |
| /* If we already have some bits beyond end |
| * or have different end, the segment is corrupted. |
| */ |
| if (end < fq->q.len || |
| ((fq->q.last_in & INET_FRAG_LAST_IN) && end != fq->q.len)) |
| goto err; |
| fq->q.last_in |= INET_FRAG_LAST_IN; |
| fq->q.len = end; |
| } else { |
| /* Check if the fragment is rounded to 8 bytes. |
| * Required by the RFC. |
| */ |
| if (end & 0x7) { |
| /* RFC2460 says always send parameter problem in |
| * this case. -DaveM |
| */ |
| IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), |
| IPSTATS_MIB_INHDRERRORS); |
| icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, |
| offsetof(struct ipv6hdr, payload_len)); |
| return -1; |
| } |
| if (end > fq->q.len) { |
| /* Some bits beyond end -> corruption. */ |
| if (fq->q.last_in & INET_FRAG_LAST_IN) |
| goto err; |
| fq->q.len = end; |
| } |
| } |
| |
| if (end == offset) |
| goto err; |
| |
| /* Point into the IP datagram 'data' part. */ |
| if (!pskb_pull(skb, (u8 *) (fhdr + 1) - skb->data)) |
| goto err; |
| |
| if (pskb_trim_rcsum(skb, end - offset)) |
| goto err; |
| |
| /* Find out which fragments are in front and at the back of us |
| * in the chain of fragments so far. We must know where to put |
| * this fragment, right? |
| */ |
| prev = NULL; |
| for(next = fq->q.fragments; next != NULL; next = next->next) { |
| if (FRAG6_CB(next)->offset >= offset) |
| break; /* bingo! */ |
| prev = next; |
| } |
| |
| /* We found where to put this one. Check for overlap with |
| * preceding fragment, and, if needed, align things so that |
| * any overlaps are eliminated. |
| */ |
| if (prev) { |
| int i = (FRAG6_CB(prev)->offset + prev->len) - offset; |
| |
| if (i > 0) { |
| offset += i; |
| if (end <= offset) |
| goto err; |
| if (!pskb_pull(skb, i)) |
| goto err; |
| if (skb->ip_summed != CHECKSUM_UNNECESSARY) |
| skb->ip_summed = CHECKSUM_NONE; |
| } |
| } |
| |
| /* Look for overlap with succeeding segments. |
| * If we can merge fragments, do it. |
| */ |
| while (next && FRAG6_CB(next)->offset < end) { |
| int i = end - FRAG6_CB(next)->offset; /* overlap is 'i' bytes */ |
| |
| if (i < next->len) { |
| /* Eat head of the next overlapped fragment |
| * and leave the loop. The next ones cannot overlap. |
| */ |
| if (!pskb_pull(next, i)) |
| goto err; |
| FRAG6_CB(next)->offset += i; /* next fragment */ |
| fq->q.meat -= i; |
| if (next->ip_summed != CHECKSUM_UNNECESSARY) |
| next->ip_summed = CHECKSUM_NONE; |
| break; |
| } else { |
| struct sk_buff *free_it = next; |
| |
| /* Old fragment is completely overridden with |
| * new one drop it. |
| */ |
| next = next->next; |
| |
| if (prev) |
| prev->next = next; |
| else |
| fq->q.fragments = next; |
| |
| fq->q.meat -= free_it->len; |
| frag_kfree_skb(fq->q.net, free_it, NULL); |
| } |
| } |
| |
| FRAG6_CB(skb)->offset = offset; |
| |
| /* Insert this fragment in the chain of fragments. */ |
| skb->next = next; |
| if (prev) |
| prev->next = skb; |
| else |
| fq->q.fragments = skb; |
| |
| dev = skb->dev; |
| if (dev) { |
| fq->iif = dev->ifindex; |
| skb->dev = NULL; |
| } |
| fq->q.stamp = skb->tstamp; |
| fq->q.meat += skb->len; |
| atomic_add(skb->truesize, &fq->q.net->mem); |
| |
| /* The first fragment. |
| * nhoffset is obtained from the first fragment, of course. |
| */ |
| if (offset == 0) { |
| fq->nhoffset = nhoff; |
| fq->q.last_in |= INET_FRAG_FIRST_IN; |
| } |
| |
| if (fq->q.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) && |
| fq->q.meat == fq->q.len) |
| return ip6_frag_reasm(fq, prev, dev); |
| |
| write_lock(&ip6_frags.lock); |
| list_move_tail(&fq->q.lru_list, &fq->q.net->lru_list); |
| write_unlock(&ip6_frags.lock); |
| return -1; |
| |
| err: |
| IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), |
| IPSTATS_MIB_REASMFAILS); |
| kfree_skb(skb); |
| return -1; |
| } |
| |
| /* |
| * 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. |
| */ |
| static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, |
| struct net_device *dev) |
| { |
| struct net *net = container_of(fq->q.net, struct net, ipv6.frags); |
| struct sk_buff *fp, *head = fq->q.fragments; |
| int payload_len; |
| unsigned int nhoff; |
| |
| fq_kill(fq); |
| |
| /* Make the one we just received the head. */ |
| if (prev) { |
| head = prev->next; |
| fp = skb_clone(head, GFP_ATOMIC); |
| |
| if (!fp) |
| goto out_oom; |
| |
| fp->next = head->next; |
| prev->next = fp; |
| |
| skb_morph(head, fq->q.fragments); |
| head->next = fq->q.fragments->next; |
| |
| kfree_skb(fq->q.fragments); |
| fq->q.fragments = head; |
| } |
| |
| WARN_ON(head == NULL); |
| WARN_ON(FRAG6_CB(head)->offset != 0); |
| |
| /* 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) |
| goto out_oversize; |
| |
| /* Head of list must not be cloned. */ |
| if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC)) |
| goto out_oom; |
| |
| /* If the first fragment is fragmented itself, we split |
| * it to two chunks: the first with data and paged part |
| * and the second, holding only fragments. */ |
| if (skb_has_frags(head)) { |
| struct sk_buff *clone; |
| int i, plen = 0; |
| |
| if ((clone = alloc_skb(0, GFP_ATOMIC)) == NULL) |
| goto out_oom; |
| clone->next = head->next; |
| head->next = clone; |
| skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list; |
| skb_frag_list_init(head); |
| for (i=0; i<skb_shinfo(head)->nr_frags; i++) |
| plen += skb_shinfo(head)->frags[i].size; |
| clone->len = clone->data_len = head->data_len - plen; |
| head->data_len -= clone->len; |
| head->len -= clone->len; |
| clone->csum = 0; |
| clone->ip_summed = head->ip_summed; |
| atomic_add(clone->truesize, &fq->q.net->mem); |
| } |
| |
| /* We have to remove fragment header from datagram and to relocate |
| * header in order to calculate ICV correctly. */ |
| nhoff = fq->nhoffset; |
| skb_network_header(head)[nhoff] = skb_transport_header(head)[0]; |
| memmove(head->head + sizeof(struct frag_hdr), head->head, |
| (head->data - head->head) - sizeof(struct frag_hdr)); |
| head->mac_header += sizeof(struct frag_hdr); |
| head->network_header += sizeof(struct frag_hdr); |
| |
| skb_shinfo(head)->frag_list = head->next; |
| skb_reset_transport_header(head); |
| skb_push(head, head->data - skb_network_header(head)); |
| atomic_sub(head->truesize, &fq->q.net->mem); |
| |
| for (fp=head->next; fp; fp = fp->next) { |
| head->data_len += fp->len; |
| head->len += fp->len; |
| if (head->ip_summed != fp->ip_summed) |
| head->ip_summed = CHECKSUM_NONE; |
| else if (head->ip_summed == CHECKSUM_COMPLETE) |
| head->csum = csum_add(head->csum, fp->csum); |
| head->truesize += fp->truesize; |
| atomic_sub(fp->truesize, &fq->q.net->mem); |
| } |
| |
| head->next = NULL; |
| head->dev = dev; |
| head->tstamp = fq->q.stamp; |
| ipv6_hdr(head)->payload_len = htons(payload_len); |
| IP6CB(head)->nhoff = nhoff; |
| |
| /* Yes, and fold redundant checksum back. 8) */ |
| if (head->ip_summed == CHECKSUM_COMPLETE) |
| head->csum = csum_partial(skb_network_header(head), |
| skb_network_header_len(head), |
| head->csum); |
| |
| rcu_read_lock(); |
| IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMOKS); |
| rcu_read_unlock(); |
| fq->q.fragments = NULL; |
| return 1; |
| |
| out_oversize: |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "ip6_frag_reasm: payload len = %d\n", payload_len); |
| goto out_fail; |
| out_oom: |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "ip6_frag_reasm: no memory for reassembly\n"); |
| out_fail: |
| rcu_read_lock(); |
| IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); |
| rcu_read_unlock(); |
| return -1; |
| } |
| |
| static int ipv6_frag_rcv(struct sk_buff *skb) |
| { |
| struct frag_hdr *fhdr; |
| struct frag_queue *fq; |
| struct ipv6hdr *hdr = ipv6_hdr(skb); |
| struct net *net = dev_net(skb_dst(skb)->dev); |
| |
| IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMREQDS); |
| |
| /* Jumbo payload inhibits frag. header */ |
| if (hdr->payload_len==0) |
| goto fail_hdr; |
| |
| if (!pskb_may_pull(skb, (skb_transport_offset(skb) + |
| sizeof(struct frag_hdr)))) |
| goto fail_hdr; |
| |
| hdr = ipv6_hdr(skb); |
| fhdr = (struct frag_hdr *)skb_transport_header(skb); |
| |
| if (!(fhdr->frag_off & htons(0xFFF9))) { |
| /* It is not a fragmented frame */ |
| skb->transport_header += sizeof(struct frag_hdr); |
| IP6_INC_STATS_BH(net, |
| ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMOKS); |
| |
| IP6CB(skb)->nhoff = (u8 *)fhdr - skb_network_header(skb); |
| return 1; |
| } |
| |
| if (atomic_read(&net->ipv6.frags.mem) > net->ipv6.frags.high_thresh) |
| ip6_evictor(net, ip6_dst_idev(skb_dst(skb))); |
| |
| if ((fq = fq_find(net, fhdr->identification, &hdr->saddr, &hdr->daddr, |
| ip6_dst_idev(skb_dst(skb)))) != NULL) { |
| int ret; |
| |
| spin_lock(&fq->q.lock); |
| |
| ret = ip6_frag_queue(fq, skb, fhdr, IP6CB(skb)->nhoff); |
| |
| spin_unlock(&fq->q.lock); |
| fq_put(fq); |
| return ret; |
| } |
| |
| IP6_INC_STATS_BH(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_REASMFAILS); |
| kfree_skb(skb); |
| return -1; |
| |
| fail_hdr: |
| IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_INHDRERRORS); |
| icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb_network_header_len(skb)); |
| return -1; |
| } |
| |
| static const struct inet6_protocol frag_protocol = |
| { |
| .handler = ipv6_frag_rcv, |
| .flags = INET6_PROTO_NOPOLICY, |
| }; |
| |
| #ifdef CONFIG_SYSCTL |
| static struct ctl_table ip6_frags_ns_ctl_table[] = { |
| { |
| .procname = "ip6frag_high_thresh", |
| .data = &init_net.ipv6.frags.high_thresh, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec |
| }, |
| { |
| .procname = "ip6frag_low_thresh", |
| .data = &init_net.ipv6.frags.low_thresh, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec |
| }, |
| { |
| .procname = "ip6frag_time", |
| .data = &init_net.ipv6.frags.timeout, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { } |
| }; |
| |
| static struct ctl_table ip6_frags_ctl_table[] = { |
| { |
| .procname = "ip6frag_secret_interval", |
| .data = &ip6_frags.secret_interval, |
| .maxlen = sizeof(int), |
| .mode = 0644, |
| .proc_handler = proc_dointvec_jiffies, |
| }, |
| { } |
| }; |
| |
| static int ip6_frags_ns_sysctl_register(struct net *net) |
| { |
| struct ctl_table *table; |
| struct ctl_table_header *hdr; |
| |
| table = ip6_frags_ns_ctl_table; |
| if (!net_eq(net, &init_net)) { |
| table = kmemdup(table, sizeof(ip6_frags_ns_ctl_table), GFP_KERNEL); |
| if (table == NULL) |
| goto err_alloc; |
| |
| table[0].data = &net->ipv6.frags.high_thresh; |
| table[1].data = &net->ipv6.frags.low_thresh; |
| table[2].data = &net->ipv6.frags.timeout; |
| } |
| |
| hdr = register_net_sysctl_table(net, net_ipv6_ctl_path, table); |
| if (hdr == NULL) |
| goto err_reg; |
| |
| net->ipv6.sysctl.frags_hdr = hdr; |
| return 0; |
| |
| err_reg: |
| if (!net_eq(net, &init_net)) |
| kfree(table); |
| err_alloc: |
| return -ENOMEM; |
| } |
| |
| static void ip6_frags_ns_sysctl_unregister(struct net *net) |
| { |
| struct ctl_table *table; |
| |
| table = net->ipv6.sysctl.frags_hdr->ctl_table_arg; |
| unregister_net_sysctl_table(net->ipv6.sysctl.frags_hdr); |
| kfree(table); |
| } |
| |
| static struct ctl_table_header *ip6_ctl_header; |
| |
| static int ip6_frags_sysctl_register(void) |
| { |
| ip6_ctl_header = register_net_sysctl_rotable(net_ipv6_ctl_path, |
| ip6_frags_ctl_table); |
| return ip6_ctl_header == NULL ? -ENOMEM : 0; |
| } |
| |
| static void ip6_frags_sysctl_unregister(void) |
| { |
| unregister_net_sysctl_table(ip6_ctl_header); |
| } |
| #else |
| static inline int ip6_frags_ns_sysctl_register(struct net *net) |
| { |
| return 0; |
| } |
| |
| static inline void ip6_frags_ns_sysctl_unregister(struct net *net) |
| { |
| } |
| |
| static inline int ip6_frags_sysctl_register(void) |
| { |
| return 0; |
| } |
| |
| static inline void ip6_frags_sysctl_unregister(void) |
| { |
| } |
| #endif |
| |
| static int ipv6_frags_init_net(struct net *net) |
| { |
| net->ipv6.frags.high_thresh = 256 * 1024; |
| net->ipv6.frags.low_thresh = 192 * 1024; |
| net->ipv6.frags.timeout = IPV6_FRAG_TIMEOUT; |
| |
| inet_frags_init_net(&net->ipv6.frags); |
| |
| return ip6_frags_ns_sysctl_register(net); |
| } |
| |
| static void ipv6_frags_exit_net(struct net *net) |
| { |
| ip6_frags_ns_sysctl_unregister(net); |
| inet_frags_exit_net(&net->ipv6.frags, &ip6_frags); |
| } |
| |
| static struct pernet_operations ip6_frags_ops = { |
| .init = ipv6_frags_init_net, |
| .exit = ipv6_frags_exit_net, |
| }; |
| |
| int __init ipv6_frag_init(void) |
| { |
| int ret; |
| |
| ret = inet6_add_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
| if (ret) |
| goto out; |
| |
| ret = ip6_frags_sysctl_register(); |
| if (ret) |
| goto err_sysctl; |
| |
| ret = register_pernet_subsys(&ip6_frags_ops); |
| if (ret) |
| goto err_pernet; |
| |
| ip6_frags.hashfn = ip6_hashfn; |
| ip6_frags.constructor = ip6_frag_init; |
| ip6_frags.destructor = NULL; |
| ip6_frags.skb_free = NULL; |
| ip6_frags.qsize = sizeof(struct frag_queue); |
| ip6_frags.match = ip6_frag_match; |
| ip6_frags.frag_expire = ip6_frag_expire; |
| ip6_frags.secret_interval = 10 * 60 * HZ; |
| inet_frags_init(&ip6_frags); |
| out: |
| return ret; |
| |
| err_pernet: |
| ip6_frags_sysctl_unregister(); |
| err_sysctl: |
| inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
| goto out; |
| } |
| |
| void ipv6_frag_exit(void) |
| { |
| inet_frags_fini(&ip6_frags); |
| ip6_frags_sysctl_unregister(); |
| unregister_pernet_subsys(&ip6_frags_ops); |
| inet6_del_protocol(&frag_protocol, IPPROTO_FRAGMENT); |
| } |