/* * netsniff-ng - the packet sniffing beast * Copyright 2011 Daniel Borkmann. * Subject to the GPL, version 2. */ #include #include #include #include "patricia.h" #include "locking.h" #include "trie.h" #include "ipv4.h" #include "ipv6.h" static struct patricia_node *tree = NULL; static struct rwlock tree_lock; void trie_addr_lookup(char *buff, size_t len, int ipv4, int *fd, struct sockaddr_storage *addr, size_t *alen) { void *data; size_t dlen; struct ipv4hdr *hdr4 = (void *) buff; struct ipv6hdr *hdr6 = (void *) buff; data = ipv4 ? (void *) &hdr4->h_daddr : (void *) &hdr6->daddr; dlen = ipv4 ? sizeof(hdr4->h_daddr) : sizeof(hdr6->daddr); if (unlikely((ipv4 && ((struct ipv4hdr *) buff)->h_version != 4) || (!ipv4 && ((struct ipv6hdr *) buff)->version != 6))) { memset(addr, 0, sizeof(*addr)); (*alen) = 0; (*fd) = -1; return; } rwlock_rd_lock(&tree_lock); (*fd) = ptree_search_data_exact(data, dlen, addr, alen, tree); rwlock_unlock(&tree_lock); } int trie_addr_maybe_update(char *buff, size_t len, int ipv4, int fd, struct sockaddr_storage *addr, size_t alen) { int ret; void *data; size_t dlen; struct ipv4hdr *hdr4 = (void *) buff; struct ipv6hdr *hdr6 = (void *) buff; data = ipv4 ? (void *) &hdr4->h_saddr : (void *) &hdr6->saddr; dlen = ipv4 ? sizeof(hdr4->h_saddr) : sizeof(hdr6->saddr); if (unlikely((ipv4 && ((struct ipv4hdr *) buff)->h_version != 4) || (!ipv4 && ((struct ipv6hdr *) buff)->version != 6))) return -1; rwlock_wr_lock(&tree_lock); ret = ptree_add_entry(data, dlen, fd, addr, alen, &tree); rwlock_unlock(&tree_lock); return ret; } void trie_addr_remove(int fd) { int found = 1; struct patricia_node *n = NULL; rwlock_wr_lock(&tree_lock); while (found) { ptree_get_key(fd, tree, &n); if (n) { ptree_del_entry(n->key, n->klen, &tree); n = NULL; } else found = 0; } rwlock_unlock(&tree_lock); } void trie_addr_remove_addr(struct sockaddr_storage *addr, size_t alen) { int found = 1; struct patricia_node *n = NULL; rwlock_wr_lock(&tree_lock); while (found) { ptree_get_key_addr(addr, alen, tree, &n); if (n) { ptree_del_entry(n->key, n->klen, &tree); n = NULL; } else found = 0; } rwlock_unlock(&tree_lock); } void trie_init(void) { rwlock_init(&tree_lock); } void trie_cleanup(void) { rwlock_wr_lock(&tree_lock); ptree_free(tree); rwlock_unlock(&tree_lock); rwlock_destroy(&tree_lock); } option>

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committer	Thomas Gleixner <tglx@linutronix.de>	2017-01-30 15:18:56 +0100
commit	08d85f3ea99f1eeafc4e8507936190e86a16ee8c (patch)
tree	410bb1acd0cd7dcfaad37ae7b63ff243b7fa4bee /arch
parent	566cf877a1fcb6d6dc0126b076aad062054c2637 (diff)

irqdomain: Avoid activating interrupts more than once

Since commit f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early"), we can end-up activating a PCI/MSI twice (once at allocation time, and once at startup time). This is normally of no consequences, except that there is some HW out there that may misbehave if activate is used more than once (the GICv3 ITS, for example, uses the activate callback to issue the MAPVI command, and the architecture spec says that "If there is an existing mapping for the EventID-DeviceID combination, behavior is UNPREDICTABLE"). While this could be worked around in each individual driver, it may make more sense to tackle the issue at the core level. In order to avoid getting in that situation, let's have a per-interrupt flag to remember if we have already activated that interrupt or not. Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early") Reported-and-tested-by: Andre Przywara <andre.przywara@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1484668848-24361-1-git-send-email-marc.zyngier@arm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Diffstat (limited to 'arch')