^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #ifndef _IPV6_FRAG_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #define _IPV6_FRAG_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <net/addrconf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <net/inet_frag.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) enum ip6_defrag_users {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) IP6_DEFRAG_LOCAL_DELIVER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) IP6_DEFRAG_CONNTRACK_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) __IP6_DEFRAG_CONNTRACK_IN = IP6_DEFRAG_CONNTRACK_IN + USHRT_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) IP6_DEFRAG_CONNTRACK_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) __IP6_DEFRAG_CONNTRACK_OUT = IP6_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) IP6_DEFRAG_CONNTRACK_BRIDGE_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) __IP6_DEFRAG_CONNTRACK_BRIDGE_IN = IP6_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Equivalent of ipv4 struct ip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct frag_queue {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct inet_frag_queue q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) __u16 nhoffset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) u8 ecn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static inline void ip6frag_init(struct inet_frag_queue *q, const void *a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct frag_queue *fq = container_of(q, struct frag_queue, q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) const struct frag_v6_compare_key *key = a;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) q->key.v6 = *key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) fq->ecn = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) static inline u32 ip6frag_key_hashfn(const void *data, u32 len, u32 seed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return jhash2(data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) sizeof(struct frag_v6_compare_key) / sizeof(u32), seed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) static inline u32 ip6frag_obj_hashfn(const void *data, u32 len, u32 seed)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) const struct inet_frag_queue *fq = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return jhash2((const u32 *)&fq->key.v6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) sizeof(struct frag_v6_compare_key) / sizeof(u32), seed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static inline int
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ip6frag_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) const struct frag_v6_compare_key *key = arg->key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) const struct inet_frag_queue *fq = ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return !!memcmp(&fq->key, key, sizeof(*key));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static inline void
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ip6frag_expire_frag_queue(struct net *net, struct frag_queue *fq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct net_device *dev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct sk_buff *head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* Paired with the WRITE_ONCE() in fqdir_pre_exit(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) if (READ_ONCE(fq->q.fqdir->dead))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) goto out_rcu_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) spin_lock(&fq->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (fq->q.flags & INET_FRAG_COMPLETE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) inet_frag_kill(&fq->q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) dev = dev_get_by_index_rcu(net, fq->iif);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) __IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /* Don't send error if the first segment did not arrive. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (!(fq->q.flags & INET_FRAG_FIRST_IN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /* sk_buff::dev and sk_buff::rbnode are unionized. So we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * pull the head out of the tree in order to be able to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * deal with head->dev.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) head = inet_frag_pull_head(&fq->q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) head->dev = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) spin_unlock(&fq->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) icmpv6_send(head, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) kfree_skb(head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) goto out_rcu_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) spin_unlock(&fq->q.lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) out_rcu_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) inet_frag_put(&fq->q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) /* Check if the upper layer header is truncated in the first fragment. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static inline bool
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) ipv6frag_thdr_truncated(struct sk_buff *skb, int start, u8 *nexthdrp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) u8 nexthdr = *nexthdrp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) __be16 frag_off;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) offset = ipv6_skip_exthdr(skb, start, &nexthdr, &frag_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (offset < 0 || (frag_off & htons(IP6_OFFSET)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) switch (nexthdr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) case NEXTHDR_TCP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) offset += sizeof(struct tcphdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) case NEXTHDR_UDP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) offset += sizeof(struct udphdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) case NEXTHDR_ICMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) offset += sizeof(struct icmp6hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) offset += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (offset > skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #endif
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags