/* * netsniff-ng - the packet sniffing beast * Copyright 2012 Markus Amend , Deutsche Flugsicherung GmbH * Subject to the GPL, version 2. * * IP Authentication Header described in RFC4302 */ #include #include #include /* for ntohs() */ #include "proto.h" #include "protos.h" #include "dissector_eth.h" #include "built_in.h" #include "pkt_buff.h" struct auth_hdr { uint8_t h_next_header; uint8_t h_payload_len; uint16_t h_reserved; uint32_t h_spi; uint32_t h_snf; } __packed; static void auth_hdr(struct pkt_buff *pkt) { ssize_t hdr_len; size_t i; struct auth_hdr *auth_ops; auth_ops = (struct auth_hdr *) pkt_pull(pkt, sizeof(*auth_ops)); if (auth_ops == NULL) return; hdr_len = (auth_ops->h_payload_len * 4) + 8; tprintf(" [ Authentication Header "); tprintf("NextHdr (%u), ", auth_ops->h_next_header); if (hdr_len > pkt_len(pkt) || hdr_len < 0){ tprintf("HdrLen (%u, %zd Bytes %s), ", auth_ops->h_payload_len, hdr_len, colorize_start_full(black, red) "invalid" colorize_end()); return; } tprintf("HdrLen (%u, %zd Bytes), ",auth_ops->h_payload_len, hdr_len); tprintf("Reserved (0x%x), ", ntohs(auth_ops->h_reserved)); /* TODO * Upgrade for Extended (64-bit) Sequence Number * http://tools.ietf.org/html/rfc4302#section-2.5.1 */ tprintf("SPI (0x%x), ", ntohl(auth_ops->h_spi)); tprintf("SNF (0x%x), ", ntohl(auth_ops->h_snf)); tprintf("ICV 0x"); for (i = sizeof(struct auth_hdr); i < hdr_len; i++) tprintf("%02x", *pkt_pull(pkt, 1)); tprintf(" ]\n"); pkt_set_proto(pkt, ð_lay3, auth_ops->h_next_header); } static void auth_hdr_less(struct pkt_buff *pkt) { ssize_t hdr_len; struct auth_hdr *auth_ops; auth_ops = (struct auth_hdr *) pkt_pull(pkt, sizeof(*auth_ops)); if (auth_ops == NULL) return; hdr_len = (auth_ops->h_payload_len * 4) + 8; if (hdr_len > pkt_len(pkt) || hdr_len < 0) return; tprintf(" AH"); pkt_pull(pkt, hdr_len - sizeof(*auth_ops)); pkt_set_proto(pkt, ð_lay3, auth_ops->h_next_header); } struct protocol ip_auth_ops = { .key = 0x33, .print_full = auth_hdr, .print_less = auth_hdr_less, }; 9b5fef408442e16121faa9eb00a65fd50'>diff
path: root/Documentation
diff options
context:
space:
mode:
authorJosh Poimboeuf <jpoimboe@redhat.com>2016-10-13 16:26:15 -0500
committerIngo Molnar <mingo@kernel.org>2016-10-18 12:21:16 +0200
commit55a76b59b5fef408442e16121faa9eb00a65fd50 (patch)
tree20716520fdd5960572e15f6b0dbac064e7b9ca34 /Documentation
parent1001354ca34179f3db924eb66672442a173147dc (diff)
locking/rwsem/x86: Add stack frame dependency for ____down_write()
Arnd reported the following objtool warning: kernel/locking/rwsem.o: warning: objtool: down_write_killable()+0x16: call without frame pointer save/setup The warning means gcc placed the ____down_write() inline asm (and its call instruction) before the frame pointer setup in down_write_killable(), which breaks frame pointer convention and can result in incorrect stack traces. Force the stack frame to be created before the call instruction by listing the stack pointer as an output operand in the inline asm statement. Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1188b7015f04baf361e59de499ee2d7272c59dce.1476393828.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation')