^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * 6LoWPAN next header compression
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Alexander Aring <aar@pengutronix.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "nhc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) static struct rb_root rb_root = RB_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static struct lowpan_nhc *lowpan_nexthdr_nhcs[NEXTHDR_MAX + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static DEFINE_SPINLOCK(lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int lowpan_nhc_insert(struct lowpan_nhc *nhc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) struct rb_node **new = &rb_root.rb_node, *parent = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /* Figure out where to put new node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) while (*new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct lowpan_nhc *this = rb_entry(*new, struct lowpan_nhc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) int result, len_dif, len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) len_dif = nhc->idlen - this->idlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (nhc->idlen < this->idlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) len = nhc->idlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) len = this->idlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) result = memcmp(nhc->id, this->id, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (!result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) result = len_dif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) parent = *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) if (result < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) new = &((*new)->rb_left);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) else if (result > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) new = &((*new)->rb_right);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* Add new node and rebalance tree. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) rb_link_node(&nhc->node, parent, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) rb_insert_color(&nhc->node, &rb_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static void lowpan_nhc_remove(struct lowpan_nhc *nhc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) rb_erase(&nhc->node, &rb_root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static struct lowpan_nhc *lowpan_nhc_by_nhcid(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct rb_node *node = rb_root.rb_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) const u8 *nhcid_skb_ptr = skb->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) while (node) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct lowpan_nhc *nhc = rb_entry(node, struct lowpan_nhc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) u8 nhcid_skb_ptr_masked[LOWPAN_NHC_MAX_ID_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int result, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (nhcid_skb_ptr + nhc->idlen > skb->data + skb->len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* copy and mask afterwards the nhid value from skb */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) memcpy(nhcid_skb_ptr_masked, nhcid_skb_ptr, nhc->idlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) for (i = 0; i < nhc->idlen; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) nhcid_skb_ptr_masked[i] &= nhc->idmask[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) result = memcmp(nhcid_skb_ptr_masked, nhc->id, nhc->idlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (result < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) node = node->rb_left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) else if (result > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) node = node->rb_right;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return nhc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) int lowpan_nhc_check_compression(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) const struct ipv6hdr *hdr, u8 **hc_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct lowpan_nhc *nhc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) spin_lock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) nhc = lowpan_nexthdr_nhcs[hdr->nexthdr];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (!(nhc && nhc->compress))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) u8 **hc_ptr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct lowpan_nhc *nhc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) spin_lock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) nhc = lowpan_nexthdr_nhcs[hdr->nexthdr];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /* check if the nhc module was removed in unlocked part.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * TODO: this is a workaround we should prevent unloading
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * of nhc modules while unlocked part, this will always drop
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * the lowpan packet but it's very unlikely.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * Solution isn't easy because we need to decide at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * lowpan_nhc_check_compression if we do a compression or not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) * Because the inline data which is added to skb, we can't move this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * handling.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if (unlikely(!nhc || !nhc->compress)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) /* In the case of RAW sockets the transport header is not set by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * the ip6 stack so we must set it ourselves
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (skb->transport_header == skb->network_header)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) skb_set_transport_header(skb, sizeof(struct ipv6hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) ret = nhc->compress(skb, hc_ptr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /* skip the transport header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) skb_pull(skb, nhc->nexthdrlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) int lowpan_nhc_do_uncompression(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) const struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct ipv6hdr *hdr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) struct lowpan_nhc *nhc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) spin_lock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) nhc = lowpan_nhc_by_nhcid(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) if (nhc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (nhc->uncompress) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) ret = nhc->uncompress(skb, sizeof(struct ipv6hdr) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) nhc->nexthdrlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) netdev_warn(dev, "received nhc id for %s which is not implemented.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) nhc->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) return -ENOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) netdev_warn(dev, "received unknown nhc id which was not found.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) hdr->nexthdr = nhc->nexthdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) skb_reset_transport_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) raw_dump_table(__func__, "raw transport header dump",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) skb_transport_header(skb), nhc->nexthdrlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) int lowpan_nhc_add(struct lowpan_nhc *nhc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (!nhc->idlen || !nhc->idsetup)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) WARN_ONCE(nhc->idlen > LOWPAN_NHC_MAX_ID_LEN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) "LOWPAN_NHC_MAX_ID_LEN should be updated to %zd.\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) nhc->idlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) nhc->idsetup(nhc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) spin_lock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (lowpan_nexthdr_nhcs[nhc->nexthdr]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) ret = lowpan_nhc_insert(nhc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) lowpan_nexthdr_nhcs[nhc->nexthdr] = nhc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) EXPORT_SYMBOL(lowpan_nhc_add);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) void lowpan_nhc_del(struct lowpan_nhc *nhc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) spin_lock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) lowpan_nhc_remove(nhc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) lowpan_nexthdr_nhcs[nhc->nexthdr] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) spin_unlock_bh(&lowpan_nhc_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) synchronize_net();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) EXPORT_SYMBOL(lowpan_nhc_del);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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