/* * 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); -next.git/tree/?h=nds-private-remove&id=b40079273279999d0a259e78d9ecb53ad82d042f'>62e15c30dc3787493f9bce847cda7eae99aae781 /net/irda parent383378d115ab6e702d77896071d36056875602db (diff)parent1b9ec81258827001c869f003e0b8dd2ddc104717 (diff)
Merge tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Arnd Bergmann: "This is a rather large set of bugfixes, as we just returned from the Christmas break. Most of these are relatively unimportant fixes for regressions introduced during the merge window, and about half of the changes are for mach-omap2. A couple of patches are just cleanups and dead code removal that I would not normally have considered for merging after -rc2, but I decided to take them along with the fixes this time. Notable fixes include: - removing the skeleton.dtsi include broke a number of machines, and we have to put empty /chosen nodes back to be able to pass kernel command lines as before - enabling Samsung platforms no longer hardwires CONFIG_HZ to 200, as it had been for no good reason for a long time" * tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (46 commits) MAINTAINERS: extend PSCI entry to cover the newly add PSCI checker code drivers: psci: annotate timer on stack to silence odebug messages ARM64: defconfig: enable DRM_MESON as module ARM64: dts: meson-gx: Add Graphic Controller nodes ARM64: dts: meson-gxl: fix GPIO include ARM: dts: imx6: Disable "weim" node in the dtsi files ARM: dts: qcom: apq8064: Add missing scm clock ARM: davinci: da8xx: Fix sleeping function called from invalid context ARM: davinci: Make __clk_{enable,disable} functions public ARM: davinci: da850: don't add emac clock to lookup table twice ARM: davinci: da850: fix infinite loop in clk_set_rate() ARM: i.MX: remove map_io callback ARM: dts: vf610-zii-dev-rev-b: Add missing newline ARM: dts: imx6qdl-nitrogen6x: remove duplicate iomux entry ARM: dts: imx31: fix AVIC base address ARM: dts: am572x-idk: Add gpios property to control PCIE_RESETn arm64: dts: vexpress: Support GICC_DIR operations ARM: dts: vexpress: Support GICC_DIR operations firmware: arm_scpi: fix reading sensor values on pre-1.0 SCPI firmwares arm64: dts: msm8996: Add required memory carveouts ...
Diffstat (limited to 'net/irda')