/* * 6LoWPAN next header compression * * * Authors: * Alexander Aring * * 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. */ #include #include #include "nhc.h" static struct rb_root rb_root = RB_ROOT; static struct lowpan_nhc *lowpan_nexthdr_nhcs[NEXTHDR_MAX]; static DEFINE_SPINLOCK(lowpan_nhc_lock); static int lowpan_nhc_insert(struct lowpan_nhc *nhc) { struct rb_node **new = &rb_root.rb_node, *parent = NULL; /* Figure out where to put new node */ while (*new) { struct lowpan_nhc *this = rb_entry(*new, struct lowpan_nhc, node); int result, len_dif, len; len_dif = nhc->idlen - this->idlen; if (nhc->idlen < this->idlen) len = nhc->idlen; else len = this->idlen; result = memcmp(nhc->id, this->id, len); if (!result) result = len_dif; parent = *new; if (result < 0) new = &((*new)->rb_left); else if (result > 0) new = &((*new)->rb_right); else return -EEXIST; } /* Add new node and rebalance tree. */ rb_link_node(&nhc->node, parent, new); rb_insert_color(&nhc->node, &rb_root); return 0; } static void lowpan_nhc_remove(struct lowpan_nhc *nhc) { rb_erase(&nhc->node, &rb_root); } static struct lowpan_nhc *lowpan_nhc_by_nhcid(const struct sk_buff *skb) { struct rb_node *node = rb_root.rb_node; const u8 *nhcid_skb_ptr = skb->data; while (node) { struct lowpan_nhc *nhc = rb_entry(node, struct lowpan_nhc, node); u8 nhcid_skb_ptr_masked[LOWPAN_NHC_MAX_ID_LEN]; int result, i; if (nhcid_skb_ptr + nhc->idlen > skb->data + skb->len) return NULL; /* copy and mask afterwards the nhid value from skb */ memcpy(nhcid_skb_ptr_masked, nhcid_skb_ptr, nhc->idlen); for (i = 0; i < nhc->idlen; i++) nhcid_skb_ptr_masked[i] &= nhc->idmask[i]; result = memcmp(nhcid_skb_ptr_masked, nhc->id, nhc->idlen); if (result < 0) node = node->rb_left; else if (result > 0) node = node->rb_right; else return nhc; } return NULL; } int lowpan_nhc_check_compression(struct sk_buff *skb, const struct ipv6hdr *hdr, u8 **hc_ptr) { struct lowpan_nhc *nhc; int ret = 0; spin_lock_bh(&lowpan_nhc_lock); nhc = lowpan_nexthdr_nhcs[hdr->nexthdr]; if (!(nhc && nhc->compress)) ret = -ENOENT; spin_unlock_bh(&lowpan_nhc_lock); return ret; } int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr, u8 **hc_ptr) { int ret; struct lowpan_nhc *nhc; spin_lock_bh(&lowpan_nhc_lock); nhc = lowpan_nexthdr_nhcs[hdr->nexthdr]; /* check if the nhc module was removed in unlocked part. * TODO: this is a workaround we should prevent unloading * of nhc modules while unlocked part, this will always drop * the lowpan packet but it's very unlikely. * * Solution isn't easy because we need to decide at * lowpan_nhc_check_compression if we do a compression or not. * Because the inline data which is added to skb, we can't move this * handling. */ if (unlikely(!nhc || !nhc->compress)) { ret = -EINVAL; goto out; } /* In the case of RAW sockets the transport header is not set by * the ip6 stack so we must set it ourselves */ if (skb->transport_header == skb->network_header) skb_set_transport_header(skb, sizeof(struct ipv6hdr)); ret = nhc->compress(skb, hc_ptr); if (ret < 0) goto out; /* skip the transport header */ skb_pull(skb, nhc->nexthdrlen); out: spin_unlock_bh(&lowpan_nhc_lock); return ret; } int lowpan_nhc_do_uncompression(struct sk_buff *skb, const struct net_device *dev, struct ipv6hdr *hdr) { struct lowpan_nhc *nhc; int ret; spin_lock_bh(&lowpan_nhc_lock); nhc = lowpan_nhc_by_nhcid(skb); if (nhc) { if (nhc->uncompress) { ret = nhc->uncompress(skb, sizeof(struct ipv6hdr) + nhc->nexthdrlen); if (ret < 0) { spin_unlock_bh(&lowpan_nhc_lock); return ret; } } else { spin_unlock_bh(&lowpan_nhc_lock); netdev_warn(dev, "received nhc id for %s which is not implemented.\n", nhc->name); return -ENOTSUPP; } } else { spin_unlock_bh(&lowpan_nhc_lock); netdev_warn(dev, "received unknown nhc id which was not found.\n"); return -ENOENT; } hdr->nexthdr = nhc->nexthdr; skb_reset_transport_header(skb); raw_dump_table(__func__, "raw transport header dump", skb_transport_header(skb), nhc->nexthdrlen); spin_unlock_bh(&lowpan_nhc_lock); return 0; } int lowpan_nhc_add(struct lowpan_nhc *nhc) { int ret; if (!nhc->idlen || !nhc->idsetup) return -EINVAL; WARN_ONCE(nhc->idlen > LOWPAN_NHC_MAX_ID_LEN, "LOWPAN_NHC_MAX_ID_LEN should be updated to %zd.\n", nhc->idlen); nhc->idsetup(nhc); spin_lock_bh(&lowpan_nhc_lock); if (lowpan_nexthdr_nhcs[nhc->nexthdr]) { ret = -EEXIST; goto out; } ret = lowpan_nhc_insert(nhc); if (ret < 0) goto out; lowpan_nexthdr_nhcs[nhc->nexthdr] = nhc; out: spin_unlock_bh(&lowpan_nhc_lock); return ret; } EXPORT_SYMBOL(lowpan_nhc_add); void lowpan_nhc_del(struct lowpan_nhc *nhc) { spin_lock_bh(&lowpan_nhc_lock); lowpan_nhc_remove(nhc); lowpan_nexthdr_nhcs[nhc->nexthdr] = NULL; spin_unlock_bh(&lowpan_nhc_lock); synchronize_net(); } EXPORT_SYMBOL(lowpan_nhc_del); td colspan='2' class='oid'>1930b60352e7e195f55b27cde15d2a8f43342a8b (patch) treeec3f66cd8d8110bf7b4f61e0446bdea505915db9 /sound/soc/codecs/max98926.h parent4be9993493bc7ee3fdf950a83bc050a3e6cf2a45 (diff)parentec960de61503ef349588dccfa3ae02efabcc2762 (diff)
Merge branch 'dsa-port-mirroring'
Florian Fainelli says: ==================== net: dsa: Port mirroring support This patch series adds support for port mirroring in the two Broadcom switch drivers. The major part of the functional are actually with the plumbing between tc and the drivers. Changes in v5: - Added Jiri's Reviewed-by tag to first patch - rebase against latest net-next/master after bcm_sf2 CFP series Changes in v4: - rebased against latest net-next/master after Vivien's changes Changes in v3: - removed multiline comments from added structures - simplify error handling in dsa_slave_add_cls_matchall Changes in v2: - fixed filter removal logic to disable the ingress or egress mirroring when there are no longer ports being monitored in ingress or egress - removed a stray list_head in dsa_port structure that is not used Tested using the two iproute2 examples: tc qdisc add dev eth1 handle ffff: ingress tc filter add dev eth1 parent ffff: \ matchall skip_sw \ action mirred egress mirror \ dev eth2 tc qdisc add dev eth1 handle 1: root prio tc filter add dev eth1 parent 1: \ matchall skip_sw \ action mirred egress mirror \ dev eth2 ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'sound/soc/codecs/max98926.h')